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这篇文章给大家介绍Android中怎么实现一个横屏切换科学计算器,内容非常详细,感兴趣的小伙伴们可以参考借鉴,希望对大家能有所帮助。
1、竖屏时能实现基本的加减乘除运算、回退和清空输入。
2、横屏时变为科学计算器,实现函数计算、进制换算等功能。输入计算公式,按等号键输出计算结果。
3、公式输入和结果显示区支持长按弹出复制、粘贴功能。
4、使用计算器过程中应不弹出软键盘。
5、可以通过进度条实时调整计算结果保留的小数点后位数,或者通过音量键完成同样的效果。
6、实现附加功能:三角函数、阶乘、XY、八进制转换、十六进制转换、√(Y&X)及括号,如sin(90)。
竖屏界面设计xml代码:
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/white" tools:context=".MainActivity"> <LinearLayout android:id="@+id/layout1" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <EditText android:id="@+id/textView" android:layout_width="match_parent" android:height="5dp" android:gravity="center|end" android:textColor="@color/black" android:textSize="50sp" android:text="" android:enabled="true" android:textCursorDrawable="@null" android:background="@null" android:inputType="none" android:textIsSelectable="true" android:layout_height="5dp" /> <SeekBar android:id="@+id/seekBar" android:layout_width="match_parent" android:layout_height="6dp" android:layout_marginBottom="5dp" android:progressDrawable="@drawable/bar" android:min="1" android:max="10"/> <androidx.gridlayout.widget.GridLayout android:layout_width="match_parent" android:layout_height="match_parent" app:useDefaultMargins="false" app:columnCount="4" app:rowCount="5"> <Button android:id="@+id/button5" android:background="@drawable/func_btn_style" android:textSize="24sp" android:textColor="#0000ff" android:text="C" /> <Button android:id="@+id/button6" android:background="@drawable/func_btn_style" android:textSize="24sp" android:textColor="#0000ff" android:text="÷" /> <Button android:id="@+id/button7" android:background="@drawable/func_btn_style" android:textSize="24sp" android:textColor="#0000ff" android:text="×" /> <Button android:id="@+id/button8" android:background="@drawable/func_btn_style" android:textSize="24sp" android:textColor="#0000ff" android:text="◁" /> <Button android:id="@+id/button9" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="1" /> <Button android:id="@+id/button10" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="2" /> <Button android:id="@+id/button11" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="3" /> <Button android:id="@+id/button12" android:background="@drawable/func_btn_style" android:textSize="24sp" android:textColor="#0000ff" android:text="-" /> <Button android:id="@+id/button13" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="4" /> <Button android:id="@+id/button14" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="5" /> <Button android:id="@+id/button15" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="6" /> <Button android:id="@+id/button16" android:background="@drawable/func_btn_style" android:textSize="24sp" android:textColor="#0000ff" android:text="+" /> <Button android:id="@+id/button17" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="7" /> <Button android:id="@+id/button18" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="8" /> <Button android:id="@+id/button19" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="9" /> <Button android:id="@+id/button20" android:background="@drawable/equals_button_style" android:textSize="24sp" android:textColor="@color/white" app:layout_rowSpan="2" android:text="=" /> <Button android:id="@+id/button21" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="%" /> <Button android:id="@+id/button22" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="0" /> <Button android:id="@+id/button23" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="." /> </androidx.gridlayout.widget.GridLayout> </LinearLayout> </androidx.constraintlayout.widget.ConstraintLayout>
竖屏效果图:(调节进度条或通过音量键可以调节小数点位数唷!)
横屏xml代码:
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/white" tools:context=".MainActivity"> <!-- 结果显示框 --> <LinearLayout android:id="@+id/layout2" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <EditText android:id="@+id/input" android:layout_width="match_parent" android:layout_height="75dp" android:cursorVisible="false" android:gravity="right|center_vertical" android:enabled="true" android:textCursorDrawable="@null" android:background="@null" android:inputType="none" android:textSize="30sp" android:textIsSelectable="true"/> <!-- 接下去采TableRow的格式进行布局设计 --> <androidx.gridlayout.widget.GridLayout android:layout_width="match_parent" android:layout_height="match_parent" app:rowCount="7" app:columnCount="6"> <TextView android:id="@+id/M" android:layout_height="wrap_content" android:gravity="center" android:text=" Mem : " /> <TextView android:id="@+id/mem" android:layout_height="wrap_content" app:layout_columnSpan="5" android:gravity="left" android:text=" 0" /> <SeekBar android:id="@+id/seekBar" android:layout_width="match_parent" android:progressDrawable="@drawable/bar" android:layout_marginBottom="5dp" android:layout_height="6dp" app:layout_columnSpan="6" android:min="1" android:max="10"/> <TextView android:id="@+id/_drg" android:layout_height="wrap_content" android:textSize="18sp" android:gravity="center" android:background="@drawable/func_btn_style" android:text="DEG" /> <Button android:id="@+id/drg" android:layout_height="wrap_content" android:background="@drawable/func_btn_style" android:textSize="18sp" android:textColor="#888" android:text="DRG" /> <Button android:id="@+id/mc" android:layout_height="wrap_content" app:layout_columnSpan="2" android:background="@drawable/func_btn_style" android:textColor="#888" android:textSize="18sp" android:text="MC" /> <Button android:id="@+id/c" android:layout_height="wrap_content" app:layout_columnSpan="2" android:background="@drawable/func_btn_style" android:textColor="#00b5e2" android:textSize="18sp" android:text="C" /> <Button android:id="@+id/sin" android:layout_height="wrap_content" android:text="sin" android:background="@drawable/func_btn_style" android:textSize="18sp" android:textColor="#888" android:textAllCaps="false"/> <Button android:id="@+id/cos" android:layout_height="wrap_content" android:textAllCaps="false" android:background="@drawable/func_btn_style" android:textSize="18sp" android:textColor="#888" android:text="cos" /> <Button android:id="@+id/tan" android:layout_height="wrap_content" android:textAllCaps="false" android:textSize="18sp" android:textColor="#888" android:background="@drawable/func_btn_style" android:text="tan" /> <Button android:id="@+id/factorial" android:layout_height="wrap_content" android:textAllCaps="false" android:textSize="18sp" android:textColor="#888" android:background="@drawable/func_btn_style" android:text="n!" /> <Button android:id="@+id/bksp" android:layout_height="wrap_content" android:layout_weight="1" app:layout_columnSpan="2" android:background="@drawable/func_btn_style" android:textColor="#00b5e2" android:textSize="18sp" android:text="◁" /> <Button android:id="@+id/one" android:layout_height="wrap_content" android:background="@drawable/buttonstyle" android:textSize="18sp" android:text="1" /> <Button android:id="@+id/two" android:layout_height="wrap_content" android:background="@drawable/buttonstyle" android:textSize="18sp" android:text="2" /> <Button android:id="@+id/three" android:layout_height="wrap_content" android:background="@drawable/buttonstyle" android:textSize="18sp" android:text="3" /> <Button android:id="@+id/divide" android:layout_height="wrap_content" android:background="@drawable/func_btn_style" android:textColor="#00b5e2" android:textSize="18sp" android:text="÷" /> <Button android:id="@+id/left" android:layout_height="wrap_content" android:background="@drawable/func_btn_style" android:text="(" android:textColor="#888" android:textSize="18sp"/> <Button android:id="@+id/right" android:layout_height="wrap_content" android:background="@drawable/func_btn_style" android:text=")" android:textColor="#888" android:textSize="18sp"/> <Button android:id="@+id/four" android:layout_height="wrap_content" android:background="@drawable/buttonstyle" android:text="4" android:textSize="18sp"/> <Button android:id="@+id/five" android:layout_height="wrap_content" android:background="@drawable/buttonstyle" android:text="5" android:textSize="18sp"/> <Button android:id="@+id/six" android:layout_height="wrap_content" android:background="@drawable/buttonstyle" android:text="6" android:textSize="18sp"/> <Button android:id="@+id/mul" android:layout_height="wrap_content" android:background="@drawable/func_btn_style" android:textColor="#00b5e2" android:text="×" android:textSize="18sp"/> <Button android:id="@+id/sqrt" android:layout_height="wrap_content" android:background="@drawable/func_btn_style" android:text="√" android:textColor="#888" android:textSize="18sp"/> <Button android:id="@+id/square" android:layout_height="wrap_content" android:background="@drawable/func_btn_style" android:text="^" android:textColor="#888" android:textSize="18sp"/> <Button android:id="@+id/seven" android:layout_height="wrap_content" android:background="@drawable/buttonstyle" android:text="7" android:textSize="18sp"/> <Button android:id="@+id/eight" android:layout_height="wrap_content" android:background="@drawable/buttonstyle" android:text="8" android:textSize="18sp"/> <Button android:id="@+id/nine" android:layout_height="wrap_content" android:background="@drawable/buttonstyle" android:text="9" android:textSize="18sp"/> <Button android:id="@+id/sub" android:layout_height="wrap_content" android:background="@drawable/func_btn_style" android:textColor="#00b5e2" android:text="-" android:textSize="18sp"/> <Button android:id="@+id/log" android:layout_height="wrap_content" android:textAllCaps="false" android:background="@drawable/func_btn_style" android:text="log" android:textColor="#888" android:textSize="18sp"/> <Button android:id="@+id/ln" android:layout_height="wrap_content" android:textAllCaps="false" android:background="@drawable/func_btn_style" android:text="ln" android:textColor="#888" android:textSize="18sp"/> <Button android:id="@+id/dot" android:layout_height="wrap_content" android:background="@drawable/buttonstyle" android:text="." android:textSize="18sp"/> <Button android:id="@+id/zero" android:layout_height="wrap_content" android:background="@drawable/buttonstyle" android:text="0" android:textSize="18sp"/> <LinearLayout android:id="@+id/linear" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" > <Button android:id="@+id/bd" android:layout_height="match_parent" android:background="@drawable/buttonstyle" android:text="D" android:textSize="18sp" android:layout_weight="1" android:layout_width="match_parent" /> <Button android:id="@+id/db" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/buttonstyle" android:textSize="18sp" android:layout_weight="1" android:text="B" /> </LinearLayout> <Button android:id="@+id/add" android:layout_height="wrap_content" android:background="@drawable/func_btn_style" android:textColor="#00b5e2" android:text="+" android:textSize="18sp"/> <Button android:id="@+id/equal" android:layout_height="wrap_content" android:background="@drawable/equals_button_style" android:textColor="#ffffff" app:layout_columnSpan="2" android:text="=" android:textSize="18sp"/> <TextView android:id="@+id/T" android:layout_height="wrap_content" android:text="提示 : " app:layout_columnSpan="6"/> <TextView android:id="@+id/tip" android:layout_height="wrap_content" android:text="欢迎使用!" app:layout_columnSpan="6"/> </androidx.gridlayout.widget.GridLayout> </LinearLayout> </androidx.constraintlayout.widget.ConstraintLayout>
横屏效果图:
Java代码如下:
package com.zjw; import android.app.Activity; import android.content.ClipboardManager; import android.content.res.Configuration; import android.graphics.Point; import android.os.Bundle; import android.text.Editable; import android.text.method.KeyListener; import android.util.Log; import android.view.Display; import android.view.KeyEvent; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.LinearLayout; import android.widget.SeekBar; import android.widget.TextView; import android.widget.Toast; import androidx.annotation.NonNull; import java.math.BigDecimal; import java.util.StringTokenizer; public class MainActivity extends Activity { /** * 定义变量 */ //舍入精度 public static final int[] DEF_DIV_SCALE = {17}; //初始化显示数据 private final String[] init =new String[1]; //显示框 private EditText input;// 用于显示输出结果 //划动条 private SeekBar seekBar; //普通控件及变量 private Button[] btn = new Button[10];// 0~9十个数字 private TextView mem, _drg, tip; private Button div, mul, sub, add, equal, sin, cos, tan, log, ln, sqrt, square, factorial, bksp, left, right, dot, bd, db, drg, mc, c; public String str_old; public String str_new; public boolean vbegin = true;// 控制输入,true为重新输入,false为接着输入 public boolean drg_flag = true;// true为角度,false为弧度 public double pi = 4 * Math.atan(1);// π值 public boolean tip_lock = true;// true为正确,可以继续输入,false错误,输入锁定 public boolean equals_flag = true;// 是否在按下=之后输入,true为之前,false为之后 //定义ContextMenu中每个菜单选项的Id final int Menu_1 = Menu.FIRST; final int Menu_2 = Menu.FIRST + 1; private ClipboardManager mClipboard = null; public boolean onCreateOptionsMenu(Menu menu) { //导入菜单布局 getMenuInflater().inflate(R.menu.main, menu); return true; } public boolean onOptionsItemSelected(MenuItem item) { //创建菜单项的点击事件 switch (item.getItemId()) { case R.id.menu_setting: Toast.makeText(this, "点击了设置", Toast.LENGTH_SHORT).show(); break; case R.id.menu_out: // Toast.makeText(this, "点击了退出", Toast.LENGTH_SHORT).show(); android.os.Process.killProcess(android.os.Process.myPid());//获取PID System.exit(0); break; default: break; } return super.onOptionsItemSelected(item); } /** *onCreate */ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //切换布局后调用,初始化显示 if(savedInstanceState!=null){ init[0] = savedInstanceState.getString("exp"); equals_flag = false; } //屏幕方向监听 int orientation = getResources().getConfiguration().orientation; if (orientation == Configuration.ORIENTATION_LANDSCAPE) { // 横屏内容 setContentView(R.layout.activity_main2); InitWigdet(); AllWigdetListener(); } else if (orientation == Configuration.ORIENTATION_PORTRAIT) { // 竖屏内容 setContentView(R.layout.activity_main); input = (EditText)findViewById(R.id.textView); input.setText(init[0]); seekBar = (SeekBar) findViewById(R.id.seekBar); seekBar.setProgress(DEF_DIV_SCALE[0]); seekBar.setOnSeekBarChangeListener(onSeekBarChangeListener); Display defaultDisplay = getWindowManager().getDefaultDisplay(); Point point = new Point(); defaultDisplay.getSize(point); Integer x = point.x; Integer y = point.y; input.setKeyListener(new KeyListener() { @Override public int getInputType() { return 0; } @Override public boolean onKeyDown(View view, Editable editable, int i, KeyEvent keyEvent) { return false; } @Override public boolean onKeyUp(View view, Editable editable, int i, KeyEvent keyEvent) { return false; } @Override public boolean onKeyOther(View view, Editable editable, KeyEvent keyEvent) { return false; } @Override public void clearMetaKeyState(View view, Editable editable, int i) { } }); View.OnClickListener onClearListener = new View.OnClickListener() { @Override public void onClick(View view) { input.setText(""); } }; View.OnClickListener onClearLastListener = new View.OnClickListener() { @Override public void onClick(View view) { String s = input.getText().toString(); int len = s.length(); if(len>0) { s = s.substring(0, len - 1); input.setText(s); } } }; View.OnClickListener onEXPListener = new View.OnClickListener() { @Override public void onClick(View view) { Button temp = (Button)view; String s = temp.getText().toString(); String show = input.getText().toString(); int len = show.length(); if(show.length()==0){ if(s.equals("+")||s.equals("×")||s.equals("÷")) return; } if((show.endsWith("+"))||(show.endsWith("-"))||(show.endsWith("×"))||(show.endsWith("÷"))||(show.endsWith("."))){ if(s.equals("+")||s.equals("×")||s.equals("÷")||s.equals("-")||(s.equals("."))){ show = show.substring(0,len-1) + s; input.setText(show); }else{ input.append(s); } }else{ input.append(s); } } }; View.OnClickListener onEXECListener = new View.OnClickListener() { @Override public void onClick(View view) { String s = input.getText().toString(); if(s.length()==0) return; s = s.replace("×","*"); s = s.replace("÷","/"); s = s.replace("%",""); if((s.endsWith("+"))||(s.endsWith("-"))||(s.endsWith("*"))||(s.endsWith("/"))||(s.endsWith(".")))return; try{ String re = Calculator.conversion(s); re = round(re,DEF_DIV_SCALE[0]); if(re.indexOf(".") > 0){ re = re.replaceAll("0+?$", "");//去掉多余的0 re = re.replaceAll("[.]$", "");//如最后一位是.则去掉 } input.setText(re); }catch (Exception e){ Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show(); input.setText(""); } } }; View.OnClickListener onPERCENTCListener = new View.OnClickListener() { @Override public void onClick(View view) { String s = input.getText().toString(); if(s.length()==0) return; s = s.replace("×","*"); s = s.replace("÷","/"); s = s.replace("%",""); if((s.endsWith("+"))||(s.endsWith("-"))||(s.endsWith("*"))||(s.endsWith("/"))||(s.endsWith("."))) return; s = s+"/100"; try{ String re = Calculator.conversion(s); re = round(re,DEF_DIV_SCALE[0]); if(re.indexOf(".") > 0){ re = re.replaceAll("0+?$", "");//去掉多余的0 re = re.replaceAll("[.]$", "");//如最后一位是.则去掉 } input.setText(re+"%"); }catch (Exception e){ Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show(); input.setText(""); } } }; input.getLayoutParams().height = 2*y/7; Button button5 = (Button)findViewById(R.id.button5); button5.getLayoutParams().width = x/4 ;button5.getLayoutParams().height = y/8; Button button6 = (Button)findViewById(R.id.button6); button6.getLayoutParams().width = x/4 ;button6.getLayoutParams().height = y/8; Button button7 = (Button)findViewById(R.id.button7); button7.getLayoutParams().width = x/4 ;button7.getLayoutParams().height = y/8; Button button8 = (Button)findViewById(R.id.button8); button8.getLayoutParams().width = x/4 ;button8.getLayoutParams().height = y/8; Button button9 = (Button)findViewById(R.id.button9); button9.getLayoutParams().width = x/4 ;button9.getLayoutParams().height = y/8; Button button10 = (Button)findViewById(R.id.button10); button10.getLayoutParams().width = x/4 ;button10.getLayoutParams().height = y/8; Button button11 = (Button)findViewById(R.id.button11); button11.getLayoutParams().width = x/4 ;button11.getLayoutParams().height = y/8; Button button12 = (Button)findViewById(R.id.button12); button12.getLayoutParams().width = x/4 ;button12.getLayoutParams().height = y/8; Button button13 = (Button)findViewById(R.id.button13); button13.getLayoutParams().width = x/4 ;button13.getLayoutParams().height = y/8; Button button14 = (Button)findViewById(R.id.button14); button14.getLayoutParams().width = x/4 ;button14.getLayoutParams().height = y/8; Button button15 = (Button)findViewById(R.id.button15); button15.getLayoutParams().width = x/4 ;button15.getLayoutParams().height = y/8; Button button16 = (Button)findViewById(R.id.button16); button16.getLayoutParams().width = x/4 ;button16.getLayoutParams().height = y/8; Button button17 = (Button)findViewById(R.id.button17); button17.getLayoutParams().width = x/4 ;button17.getLayoutParams().height = y/8; Button button18 = (Button)findViewById(R.id.button18); button18.getLayoutParams().width = x/4 ;button18.getLayoutParams().height = y/8; Button button19 = (Button)findViewById(R.id.button19); button19.getLayoutParams().width = x/4 ;button19.getLayoutParams().height = y/8; Button button20 = (Button)findViewById(R.id.button20); button20.getLayoutParams().width = x/4 ;button20.getLayoutParams().height = 2*(y/8); Button button21 = (Button)findViewById(R.id.button21); button21.getLayoutParams().width = x/4 ;button21.getLayoutParams().height = y/8; Button button22 = (Button)findViewById(R.id.button22); button22.getLayoutParams().width = x/4 ;button22.getLayoutParams().height = y/8; Button button23 = (Button)findViewById(R.id.button23); button23.getLayoutParams().width = x/4 ;button23.getLayoutParams().height = y/8; button6.setOnClickListener(onEXPListener);button7.setOnClickListener(onEXPListener); button9.setOnClickListener(onEXPListener);button10.setOnClickListener(onEXPListener); button11.setOnClickListener(onEXPListener);button12.setOnClickListener(onEXPListener); button13.setOnClickListener(onEXPListener);button14.setOnClickListener(onEXPListener); button15.setOnClickListener(onEXPListener);button16.setOnClickListener(onEXPListener); button17.setOnClickListener(onEXPListener);button18.setOnClickListener(onEXPListener); button19.setOnClickListener(onEXPListener);button21.setOnClickListener(onEXPListener); button22.setOnClickListener(onEXPListener);button23.setOnClickListener(onEXPListener); button5.setOnClickListener(onClearListener); button8.setOnClickListener(onClearLastListener); button20.setOnClickListener(onEXECListener); button21.setOnClickListener(onPERCENTCListener); } } /** * 初始化所有的组件 */ private void InitWigdet() { //获取屏幕参数 Display defaultDisplay = getWindowManager().getDefaultDisplay(); Point point = new Point(); defaultDisplay.getSize(point); Integer x = point.x; Integer y = point.y - 60; // 获取界面元素 input = (EditText) findViewById(R.id.input); input.setKeyListener(new KeyListener() { @Override public int getInputType() { return 0; } @Override public boolean onKeyDown(View view, Editable editable, int i, KeyEvent keyEvent) { return false; } @Override public boolean onKeyUp(View view, Editable editable, int i, KeyEvent keyEvent) { return false; } @Override public boolean onKeyOther(View view, Editable editable, KeyEvent keyEvent) { return false; } @Override public void clearMetaKeyState(View view, Editable editable, int i) { } }); input.setText(init[0]); seekBar = (SeekBar) findViewById(R.id.seekBar); //seekBar.getLayoutParams().height = y/7/3; seekBar.setProgress(DEF_DIV_SCALE[0]); seekBar.setOnSeekBarChangeListener(onSeekBarChangeListener); input.getLayoutParams().height = y/9; mem = (TextView) findViewById(R.id.mem); tip = (TextView) findViewById(R.id.tip); _drg = (TextView) findViewById(R.id._drg); _drg.getLayoutParams().width = x/6 ;_drg.getLayoutParams().height = y/10-8; btn[0] = (Button) findViewById(R.id.zero); btn[0].getLayoutParams().width = x/6 ;btn[0].getLayoutParams().height = y/10; btn[1] = (Button) findViewById(R.id.one); btn[1].getLayoutParams().width = x/6 ;btn[1].getLayoutParams().height = y/10; btn[2] = (Button) findViewById(R.id.two); btn[2].getLayoutParams().width = x/6 ;btn[2].getLayoutParams().height = y/10; btn[3] = (Button) findViewById(R.id.three); btn[3].getLayoutParams().width = x/6 ;btn[3].getLayoutParams().height = y/10; btn[4] = (Button) findViewById(R.id.four); btn[4].getLayoutParams().width = x/6 ;btn[4].getLayoutParams().height = y/10; btn[5] = (Button) findViewById(R.id.five); btn[5].getLayoutParams().width = x/6 ;btn[5].getLayoutParams().height = y/10; btn[6] = (Button) findViewById(R.id.six); btn[6].getLayoutParams().width = x/6 ;btn[6].getLayoutParams().height = y/10; btn[7] = (Button) findViewById(R.id.seven); btn[7].getLayoutParams().width = x/6 ;btn[7].getLayoutParams().height = y/10; btn[8] = (Button) findViewById(R.id.eight); btn[8].getLayoutParams().width = x/6 ;btn[8].getLayoutParams().height = y/10; btn[9] = (Button) findViewById(R.id.nine); btn[9].getLayoutParams().width = x/6 ;btn[9].getLayoutParams().height = y/10; div = (Button) findViewById(R.id.divide); div.getLayoutParams().width = x/6 ;div.getLayoutParams().height = y/10; mul = (Button) findViewById(R.id.mul);mul.getLayoutParams().width = x/6 ;mul.getLayoutParams().height = y/10; sub = (Button) findViewById(R.id.sub); sub.getLayoutParams().width = x/6 ;sub.getLayoutParams().height = y/10; add = (Button) findViewById(R.id.add); add.getLayoutParams().width = x/6 ;add.getLayoutParams().height = y/10; equal = (Button) findViewById(R.id.equal); equal.getLayoutParams().width = 2*x/6 ;equal.getLayoutParams().height = y/10; sin = (Button) findViewById(R.id.sin); sin.getLayoutParams().width = x/6 ;sin.getLayoutParams().height = y/10-8; cos = (Button) findViewById(R.id.cos); cos.getLayoutParams().width = x/6 ;cos.getLayoutParams().height = y/10-8; tan = (Button) findViewById(R.id.tan); tan.getLayoutParams().width = x/6 ;tan.getLayoutParams().height = y/10-8; log = (Button) findViewById(R.id.log); log.getLayoutParams().width = x/6 ;log.getLayoutParams().height = y/10; ln = (Button) findViewById(R.id.ln); ln.getLayoutParams().width = x/6 ;ln.getLayoutParams().height = y/10; sqrt = (Button) findViewById(R.id.sqrt); sqrt.getLayoutParams().width = x/6 ;sqrt.getLayoutParams().height = y/10; square = (Button) findViewById(R.id.square); square.getLayoutParams().width = x/6 ;square.getLayoutParams().height = y/10; factorial = (Button) findViewById(R.id.factorial);factorial.getLayoutParams().width = x/6 ;factorial.getLayoutParams().height = y/10-8; bksp = (Button) findViewById(R.id.bksp);bksp.getLayoutParams().width = 2*x/6 ;bksp.getLayoutParams().height = y/10-8; left = (Button) findViewById(R.id.left); left.getLayoutParams().width = x/6 ;left.getLayoutParams().height = y/10; right = (Button) findViewById(R.id.right); right.getLayoutParams().width = x/6 ;right.getLayoutParams().height = y/10; dot = (Button) findViewById(R.id.dot);dot.getLayoutParams().width = x/6 ;dot.getLayoutParams().height = y/10; bd = (Button) findViewById(R.id.bd); LinearLayout linearLayout = (LinearLayout) findViewById(R.id.linear);linearLayout.getLayoutParams().width = x/6 ;linearLayout.getLayoutParams().height = y/10; db = (Button) findViewById(R.id.db); drg = (Button) findViewById(R.id.drg);drg.getLayoutParams().width = x/6 ;drg.getLayoutParams().height = y/10-8; mc = (Button) findViewById(R.id.mc); mc.getLayoutParams().width = 2*x/6 ;mc.getLayoutParams().height = y/10-8; c = (Button) findViewById(R.id.c); c.getLayoutParams().width = 2*x/6 ;c.getLayoutParams().height = y/10-8; } /** * 为所有按键绑定监听器 */ private void AllWigdetListener() { // 数字键 for (int i = 0; i < 10; i++) { btn[i].setOnClickListener(actionPerformed); } // 为+-x÷等按键绑定监听器 div.setOnClickListener(actionPerformed); mul.setOnClickListener(actionPerformed); sub.setOnClickListener(actionPerformed); add.setOnClickListener(actionPerformed); equal.setOnClickListener(actionPerformed); sin.setOnClickListener(actionPerformed); cos.setOnClickListener(actionPerformed); tan.setOnClickListener(actionPerformed); log.setOnClickListener(actionPerformed); ln.setOnClickListener(actionPerformed); sqrt.setOnClickListener(actionPerformed); square.setOnClickListener(actionPerformed); factorial.setOnClickListener(actionPerformed); bksp.setOnClickListener(actionPerformed); left.setOnClickListener(actionPerformed); right.setOnClickListener(actionPerformed); dot.setOnClickListener(actionPerformed); bd.setOnClickListener(actionPerformed); db.setOnClickListener(actionPerformed); drg.setOnClickListener(actionPerformed); mc.setOnClickListener(actionPerformed); c.setOnClickListener(actionPerformed); } /** * 键盘命令捕捉 */ String[] TipCommand = new String[500]; int tip_i = 0;// TipCommand的指针 private View.OnClickListener actionPerformed = new View.OnClickListener() { public void onClick(View v) { // 按键上的命令获取 String command = ((Button) v).getText().toString(); // 显示器上的字符串 String str = input.getText().toString(); // 检测输入是否合法 if (equals_flag == false && "0123456789.()sincostanlnlogn!+-×÷√^".indexOf(command) != -1) { // 检测显示器上的字符串是否合法 if (right(str)) { if ("+-×÷√^)".indexOf(command) != -1) { for (int i = 0; i < str.length(); i++) { TipCommand[tip_i] = String.valueOf(str.charAt(i)); tip_i++; } vbegin = false; } } else { input.setText("0"); vbegin = true; tip_i = 0; tip_lock = true; tip.setText("welcome use the APP!"); } equals_flag = true; } if (tip_i > 0) TipChecker(TipCommand[tip_i - 1], command); else if (tip_i == 0) { TipChecker("#", command); } if ("0123456789.()sincostanlnlogn!+-×÷√^".indexOf(command) != -1 && tip_lock) { TipCommand[tip_i] = command; tip_i++; } // 若输入正确,则将输入信息显示到显示器上 if ("0123456789.()sincostanlnlogn!+-×÷√^".indexOf(command) != -1 && tip_lock) { // 共25个按键 print(command); // 若果点击了“DRG”,则切换当前弧度角度制,并将切换后的结果显示到按键上方。 } else if (command.compareTo("DRG") == 0 && tip_lock) { if (drg_flag == true) { drg_flag = false; _drg.setText("RAD"); } else { drg_flag = true; _drg.setText("DEG"); } // 如果输入时退格键,并且是在按=之前 } else if (command.compareTo("◁") == 0 && equals_flag) { // 一次删除3个字符 if (TTO(str) == 3) { if (str.length() > 3) input.setText(str.substring(0, str.length() - 3)); else if (str.length() == 3) { input.setText("0"); vbegin = true; tip_i = 0; tip.setText("welcome use the APP!"); } // 依次删除2个字符 } else if (TTO(str) == 2) { if (str.length() > 2) input.setText(str.substring(0, str.length() - 2)); else if (str.length() == 2) { input.setText("0"); vbegin = true; tip_i = 0; tip.setText("welcome use the APP!"); } // 依次删除一个字符 } else if (TTO(str) == 1) { // 若之前输入的字符串合法则删除一个字符 if (right(str)) { if (str.length() > 1) input.setText(str.substring(0, str.length() - 1)); else if (str.length() == 1) { input.setText("0"); vbegin = true; tip_i = 0; tip.setText("welcome use the APP!"); } // 若之前输入的字符串不合法则删除全部字符 } else { input.setText("0"); vbegin = true; tip_i = 0; tip.setText("welcome use the APP!"); } } if (input.getText().toString().compareTo("-") == 0 || equals_flag == false) { input.setText("0"); vbegin = true; tip_i = 0; tip.setText("welcome use the APP!"); } tip_lock = true; if (tip_i > 0) tip_i--; // 如果是在按=之后输入退格键 } else if (command.compareTo("Bksp") == 0 && equals_flag == false) { // 将显示器内容设置为0 input.setText("0"); vbegin = true; tip_i = 0; tip_lock = true; tip.setText("welcome use the APP!"); // 如果输入的是清除键 } else if (command.compareTo("C") == 0) { // 将显示器内容设置为0 input.setText("0"); // 重新输入标志置为true vbegin = true; // 缓存命令位数清0 tip_i = 0; // 表明可以继续输入 tip_lock = true; // 表明输入=之前 equals_flag = true; tip.setText("welcome use the APP!"); // 如果输入的是”MC“,则将存储器内容清0 } else if (command.compareTo("MC") == 0) { mem.setText("0"); // 如果按”bd“则转换进制 } else if (command.compareTo("B") == 0) { String s = input.getText().toString(); s = s.replace(".",""); //非法字符清屏 if(".+-x÷√^sincostanloglnn!()".indexOf(s) != -1){ input.setText("0"); }else { try { int a = Integer.valueOf(s); String re = Integer.toBinaryString(a); input.setText(re); }catch (Exception e){ input.setText(""); Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show(); } } // 如果按”db“则转换进制 }else if(command.compareTo("D") == 0){ String s = input.getText().toString(); s = s.replace(".",""); input.setText("1234567890"); //非法字符清屏 if("23456789+-x÷√^sincostanloglnn!().".indexOf(s) != -1){ input.setText("0"); }else{ try{ Integer re = Integer.parseInt(s,2); input.setText(re.toString()); }catch (Exception e){ input.setText(""); Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show(); } } } else if (command.compareTo("=") == 0 && tip_lock && right(str) && equals_flag) { tip_i = 0; // 表明不可以继续输入 tip_lock = false; // 表明输入=之后 equals_flag = false; // 保存原来算式样子 str_old = str; // 替换算式中的运算符,便于计算 str = str.replaceAll("sin", "s"); str = str.replaceAll("cos", "c"); str = str.replaceAll("tan", "t"); str = str.replaceAll("log", "g"); str = str.replaceAll("ln", "l"); str = str.replaceAll("n!", "!"); // 重新输入标志设置true vbegin = true; // 将-1x转换成- str_new = str.replaceAll("-", "-1×"); // 计算算式结果 new calc().process(str_new); } // 表明可以继续输入 tip_lock = true; } }; /* * 检测函数,对str进行前后语法检测 为Tip的提示方式提供依据,与TipShow()配合使用 编号 字符 其后可以跟随的合法字符 1 ( * 数字|(|-|.|函数 2 ) 算符|)|√ ^ 3 . 数字|算符|)|√ ^ 4 数字 .|数字|算符|)|√ ^ 5 算符 * 数字|(|.|函数 6 √ ^ ( |. | 数字 7 函数 数字|(|. * * 小数点前后均可省略,表示0 数字第一位可以为0 */ private void TipChecker(String tipcommand1, String tipcommand2) { // Tipcode1表示错误类型,Tipcode2表示名词解释类型 int Tipcode1 = 0, Tipcode2 = 0; // 表示命令类型 int tiptype1 = 0, tiptype2 = 0; // 括号数 int bracket = 0; // “+-x÷√^”不能作为第一位 if (tipcommand1.compareTo("#") == 0 && (tipcommand2.compareTo("÷") == 0 || tipcommand2.compareTo("×") == 0 || tipcommand2.compareTo("+") == 0 || tipcommand2.compareTo(")") == 0 || tipcommand2.compareTo("√") == 0 || tipcommand2 .compareTo("^") == 0)) { Tipcode1 = -1; } // 定义存储字符串中最后一位的类型 else if (tipcommand1.compareTo("#") != 0) { if (tipcommand1.compareTo("(") == 0) { tiptype1 = 1; } else if (tipcommand1.compareTo(")") == 0) { tiptype1 = 2; } else if (tipcommand1.compareTo(".") == 0) { tiptype1 = 3; } else if ("0123456789".indexOf(tipcommand1) != -1) { tiptype1 = 4; } else if ("+-×÷".indexOf(tipcommand1) != -1) { tiptype1 = 5; } else if ("√^".indexOf(tipcommand1) != -1) { tiptype1 = 6; } else if ("sincostanloglnn!".indexOf(tipcommand1) != -1) { tiptype1 = 7; } // 定义欲输入的按键类型 if (tipcommand2.compareTo("(") == 0) { tiptype2 = 1; } else if (tipcommand2.compareTo(")") == 0) { tiptype2 = 2; } else if (tipcommand2.compareTo(".") == 0) { tiptype2 = 3; } else if ("0123456789".indexOf(tipcommand2) != -1) { tiptype2 = 4; } else if ("+-×÷".indexOf(tipcommand2) != -1) { tiptype2 = 5; } else if ("√^".indexOf(tipcommand2) != -1) { tiptype2 = 6; } else if ("sincostanloglnn!".indexOf(tipcommand2) != -1) { tiptype2 = 7; } switch (tiptype1) { case 1: // 左括号后面直接接右括号,“+x÷”(负号“-”不算),或者"√^" if (tiptype2 == 2 || (tiptype2 == 5 && tipcommand2.compareTo("-") != 0) || tiptype2 == 6) Tipcode1 = 1; break; case 2: // 右括号后面接左括号,数字,“+-x÷sin^...” if (tiptype2 == 1 || tiptype2 == 3 || tiptype2 == 4 || tiptype2 == 7) Tipcode1 = 2; break; case 3: // “.”后面接左括号或者“sincos...” if (tiptype2 == 1 || tiptype2 == 7) Tipcode1 = 3; // 连续输入两个“.” if (tiptype2 == 3) Tipcode1 = 8; break; case 4: // 数字后面直接接左括号或者“sincos...” if (tiptype2 == 1 || tiptype2 == 7) Tipcode1 = 4; break; case 5: // “+-x÷”后面直接接右括号,“+-x÷√^” if (tiptype2 == 2 || tiptype2 == 5 || tiptype2 == 6) Tipcode1 = 5; break; case 6: // “√^”后面直接接右括号,“+-x÷√^”以及“sincos...” if (tiptype2 == 2 || tiptype2 == 5 || tiptype2 == 6 || tiptype2 == 7) Tipcode1 = 6; break; case 7: // “sincos...”后面直接接右括号“+-x÷√^”以及“sincos...” if (tiptype2 == 2 || tiptype2 == 5 || tiptype2 == 6 || tiptype2 == 7) Tipcode1 = 7; break; } } // 检测小数点的重复性,Tipconde1=0,表明满足前面的规则 if (Tipcode1 == 0 && tipcommand2.compareTo(".") == 0) { int tip_point = 0; for (int i = 0; i < tip_i; i++) { // 若之前出现一个小数点点,则小数点计数加1 if (TipCommand[i].compareTo(".") == 0) { tip_point++; } // 若出现以下几个运算符之一,小数点计数清零 if (TipCommand[i].compareTo("sin") == 0 || TipCommand[i].compareTo("cos") == 0 || TipCommand[i].compareTo("tan") == 0 || TipCommand[i].compareTo("log") == 0 || TipCommand[i].compareTo("ln") == 0 || TipCommand[i].compareTo("n!") == 0 || TipCommand[i].compareTo("√") == 0 || TipCommand[i].compareTo("^") == 0 || TipCommand[i].compareTo("÷") == 0 || TipCommand[i].compareTo("×") == 0 || TipCommand[i].compareTo("-") == 0 || TipCommand[i].compareTo("+") == 0 || TipCommand[i].compareTo("(") == 0 || TipCommand[i].compareTo(")") == 0) { tip_point = 0; } } tip_point++; // 若小数点计数大于1,表明小数点重复了 if (tip_point > 1) { Tipcode1 = 8; } } // 检测右括号是否匹配 if (Tipcode1 == 0 && tipcommand2.compareTo(")") == 0) { int tip_right_bracket = 0; for (int i = 0; i < tip_i; i++) { // 如果出现一个左括号,则计数加1 if (TipCommand[i].compareTo("(") == 0) { tip_right_bracket++; } // 如果出现一个右括号,则计数减1 if (TipCommand[i].compareTo(")") == 0) { tip_right_bracket--; } } // 如果右括号计数=0,表明没有响应的左括号与当前右括号匹配 if (tip_right_bracket == 0) { Tipcode1 = 10; } } // 检查输入=的合法性 if (Tipcode1 == 0 && tipcommand2.compareTo("=") == 0) { // 括号匹配数 int tip_bracket = 0; for (int i = 0; i < tip_i; i++) { if (TipCommand[i].compareTo("(") == 0) { tip_bracket++; } if (TipCommand[i].compareTo(")") == 0) { tip_bracket--; } } // 若大于0,表明左括号还有未匹配的 if (tip_bracket > 0) { Tipcode1 = 9; bracket = tip_bracket; } else if (tip_bracket == 0) { // 若前一个字符是以下之一,表明=号不合法 if ("√^sincostanloglnn!".indexOf(tipcommand1) != -1) { Tipcode1 = 6; } // 若前一个字符是以下之一,表明=号不合法 if ("+-×÷".indexOf(tipcommand1) != -1) { Tipcode1 = 5; } } } // 若命令式以下之一,则显示相应的帮助信息 if (tipcommand2.compareTo("MC") == 0) Tipcode2 = 1; if (tipcommand2.compareTo("C") == 0) Tipcode2 = 2; if (tipcommand2.compareTo("DRG") == 0) Tipcode2 = 3; if (tipcommand2.compareTo("Bksp") == 0) Tipcode2 = 4; if (tipcommand2.compareTo("sin") == 0) Tipcode2 = 5; if (tipcommand2.compareTo("cos") == 0) Tipcode2 = 6; if (tipcommand2.compareTo("tan") == 0) Tipcode2 = 7; if (tipcommand2.compareTo("log") == 0) Tipcode2 = 8; if (tipcommand2.compareTo("ln") == 0) Tipcode2 = 9; if (tipcommand2.compareTo("n!") == 0) Tipcode2 = 10; if (tipcommand2.compareTo("√") == 0) Tipcode2 = 11; if (tipcommand2.compareTo("^") == 0) Tipcode2 = 12; // 显示帮助和错误信息 TipShow(bracket, Tipcode1, Tipcode2, tipcommand1, tipcommand2); } /* * 反馈Tip信息,加强人机交互,与TipChecker()配合使用 */ private void TipShow(int bracket, int tipcode1, int tipcode2,String tipcommand1, String tipcommand2) { String tipmessage = ""; if (tipcode1 != 0) tip_lock = false;// 表明输入有误 switch (tipcode1) { case -1: tipmessage = tipcommand2 + " 不能作为第一个算符\n"; break; case 1: tipmessage = tipcommand1 + " 后应输入:数字/(/./-/函数 \n"; break; case 2: tipmessage = tipcommand1 + " 后应输入:)/算符 \n"; break; case 3: tipmessage = tipcommand1 + " 后应输入:)/数字/算符 \n"; break; case 4: tipmessage = tipcommand1 + " 后应输入:)/./数字 /算符 \n"; break; case 5: tipmessage = tipcommand1 + " 后应输入:(/./数字/函数 \n"; break; case 6: tipmessage = tipcommand1 + " 后应输入:(/./数字 \n"; break; case 7: tipmessage = tipcommand1 + " 后应输入:(/./数字 \n"; break; case 8: tipmessage = "小数点重复\n"; break; case 9: tipmessage = "不能计算,缺少 " + bracket + " 个 )"; break; case 10: tipmessage = "不需要 )"; break; } switch (tipcode2) { case 1: tipmessage = tipmessage + "[MC 用法: 清除记忆 MEM]"; break; case 2: tipmessage = tipmessage + "[C 用法: 归零]"; break; case 3: tipmessage = tipmessage + "[DRG 用法: 选择 DEG 或 RAD]"; break; case 4: tipmessage = tipmessage + "[Bksp 用法: 退格]"; break; case 5: tipmessage = tipmessage + "sin 函数用法示例:\n" + "DEG:sin30 = 0.5 RAD:sin1 = 0.84\n" + "注:与其他函数一起使用时要加括号,如:\n" + "sin(cos45),而不是sincos45"; break; case 6: tipmessage = tipmessage + "cos 函数用法示例:\n" + "DEG:cos60 = 0.5 RAD:cos1 = 0.54\n" + "注:与其他函数一起使用时要加括号,如:\n" + "cos(sin45),而不是cossin45"; break; case 7: tipmessage = tipmessage + "tan 函数用法示例:\n" + "DEG:tan45 = 1 RAD:tan1 = 1.55\n" + "注:与其他函数一起使用时要加括号,如:\n" + "tan(cos45),而不是tancos45"; break; case 8: tipmessage = tipmessage + "log 函数用法示例:\n" + "log10 = log(5+5) = 1\n" + "注:与其他函数一起使用时要加括号,如:\n" + "log(tan45),而不是logtan45"; break; case 9: tipmessage = tipmessage + "ln 函数用法示例:\n" + "ln10 = le(5+5) = 2.3 lne = 1\n" + "注:与其他函数一起使用时要加括号,如:\n" + "ln(tan45),而不是lntan45"; break; case 10: tipmessage = tipmessage + "n! 函数用法示例:\n" + "n!3 = n!(1+2) = 3×2×1 = 6\n" + "注:与其他函数一起使用时要加括号,如:\n" + "n!(log1000),而不是n!log1000"; break; case 11: tipmessage = tipmessage + "√ 用法示例:开任意次根号\n" + "如:27开3次根为 27√3 = 3\n" + "注:与其他函数一起使用时要加括号,如:\n" + "(函数)√(函数) , (n!3)√(log100) = 2.45"; break; case 12: tipmessage = tipmessage + "^ 用法示例:开任意次平方\n" + "如:2的3次方为 2^3 = 8\n" + "注:与其他函数一起使用时要加括号,如:\n" + "(函数)√(函数) , (n!3)^(log100) = 36"; break; } // 将提示信息显示到tip tip.setText(tipmessage); } /** * 将信息显示在显示屏上 */ private void print(String str) { // 清屏后输出 if (vbegin) { input.setText(str); } else { input.append(str); } vbegin = false; } /* * 检测函数,返回值为3、2、1 表示应当一次删除几个? Three+Two+One = TTO 为Bksp按钮的删除方式提供依据 * 返回3,表示str尾部为sin、cos、tan、log中的一个,应当一次删除3个 返回2,表示str尾部为ln、n!中的一个,应当一次删除2个 * 返回1,表示为除返回3、2外的所有情况,只需删除一个(包含非法字符时要另外考虑:应清屏) */ private int TTO(String str) { if ((str.charAt(str.length() - 1) == 'n' && str.charAt(str.length() - 2) == 'i' && str.charAt(str .length() - 3) == 's') || (str.charAt(str.length() - 1) == 's' && str.charAt(str.length() - 2) == 'o' && str .charAt(str.length() - 3) == 'c') || (str.charAt(str.length() - 1) == 'n' && str.charAt(str.length() - 2) == 'a' && str .charAt(str.length() - 3) == 't') || (str.charAt(str.length() - 1) == 'g' && str.charAt(str.length() - 2) == 'o' && str .charAt(str.length() - 3) == 'l')) { return 3; } else if ((str.charAt(str.length() - 1) == 'n' && str.charAt(str .length() - 2) == 'l') || (str.charAt(str.length() - 1) == '!' && str.charAt(str .length() - 2) == 'n')) { return 2; } else { return 1; } } /* * 判断一个str是否是合法的,返回值为true、false * 只包含0123456789.()sincostanlnlogn!+-×÷√^的是合法的str,返回true * 包含了除0123456789.()sincostanlnlogn!+-×÷√^以外的字符的str为非法的,返回false */ private boolean right(String str) { int i = 0; for (i = 0; i < str.length(); i++) { if (str.charAt(i) != '0' && str.charAt(i) != '1' && str.charAt(i) != '2' && str.charAt(i) != '3' && str.charAt(i) != '4' && str.charAt(i) != '5' && str.charAt(i) != '6' && str.charAt(i) != '7' && str.charAt(i) != '8' && str.charAt(i) != '9' && str.charAt(i) != '.' && str.charAt(i) != '-' && str.charAt(i) != '+' && str.charAt(i) != '×' && str.charAt(i) != '÷' && str.charAt(i) != '√' && str.charAt(i) != '^' && str.charAt(i) != 's' && str.charAt(i) != 'i' && str.charAt(i) != 'n' && str.charAt(i) != 'c' && str.charAt(i) != 'o' && str.charAt(i) != 't' && str.charAt(i) != 'a' && str.charAt(i) != 'l' && str.charAt(i) != 'g' && str.charAt(i) != '(' && str.charAt(i) != ')' && str.charAt(i) != '!') break; } if (i == str.length()) { return true; } else { return false; } } /* * 整个计算核心, * 只要将表达式的整个字符串传入calc().process()就可以实行计算了 算法包括以下几部分: * 1、计算部分 * process(String str) 当然,这是建立在查错无错误的情况下 * 2、数据格式化 FP(double n) 使数据有相当的精确度 * 3、阶乘算法 N(double n) 计算n!,将结果返回 * 4、错误提示 showError(int code ,String str) * 将错误返回 */ public class calc { public calc() { } final int MAXLEN = 500; /* * 计算表达式 从左向右扫描,数字入number栈,运算符入operator栈 * +-基本优先级为1, * ×÷基本优先级为2, * log ln sin cos tan n!基本优先级为3, * √^基本优先级为4 * 括号内层运算符比外层同级运算符优先级高4 * 当前运算符优先级高于栈顶压栈, * 低于栈顶弹出一个运算符与两个数进行运算 * 重复直到当前运算符大于栈顶 * 扫描完后对剩下的运算符与数字依次计算 */ public void process(String str) { int weightPlus = 0, topOp = 0, topNum = 0, flag = 1, weightTemp = 0; // weightPlus为同一()下的基本优先级,weightTemp临时记录优先级的变化 // topOp为weight[],operator[]的计数器;topNum为number[]的计数器 // flag为正负数的计数器,1为正数,-1为负数 int weight[]; // 保存operator栈中运算符的优先级,以topOp计数 double number[]; // 保存数字,以topNum计数 char ch, ch_gai, operator[];// operator[]保存运算符,以topOp计数 String num;// 记录数字,str以+-×÷()sctgl!√^分段,+-×÷()sctgl!√^字符之间的字符串即为数字 weight = new int[MAXLEN]; number = new double[MAXLEN]; operator = new char[MAXLEN]; String expression = str; StringTokenizer expToken = new StringTokenizer(expression, "+-×÷()sctgl!√^"); int i = 0; while (i < expression.length()) { ch = expression.charAt(i); // 判断正负数 if (i == 0) { if (ch == '-') flag = -1; } else if (expression.charAt(i - 1) == '(' && ch == '-') flag = -1; // 取得数字,并将正负符号转移给数字 if (ch <= '9' && ch >= '0' || ch == '.' || ch == 'E') { num = expToken.nextToken(); ch_gai = ch; Log.e("guojs", ch + "--->" + i); // 取得整个数字 while (i < expression.length() && (ch_gai <= '9' && ch_gai >= '0' || ch_gai == '.' || ch_gai == 'E')) { ch_gai = expression.charAt(i++); Log.e("guojs", "i的值为:" + i); } // 将指针退回之前的位置 if (i >= expression.length()) i -= 1; else { i -= 2; } if (num.compareTo(".") == 0) number[topNum++] = 0; // 将正负符号转移给数字 else { number[topNum++] = Double.parseDouble(num) * flag; flag = 1; } } // 计算运算符的优先级 if (ch == '(') weightPlus += 4; if (ch == ')') weightPlus -= 4; if (ch == '-' && flag == 1 || ch == '+' || ch == '×' || ch == '÷' || ch == 's' || ch == 'c' || ch == 't' || ch == 'g' || ch == 'l' || ch == '!' || ch == '√' || ch == '^') { switch (ch) { // +-的优先级最低,为1 case '+': case '-': weightTemp = 1 + weightPlus; break; // x÷的优先级稍高,为2 case '×': case '÷': weightTemp = 2 + weightPlus; break; // sincos之类优先级为3 case 's': case 'c': case 't': case 'g': case 'l': case '!': weightTemp = 3 + weightPlus; break; // 其余优先级为4 // case '^': // case '√': default: weightTemp = 4 + weightPlus; break; } // 如果当前优先级大于堆栈顶部元素,则直接入栈 if (topOp == 0 || weight[topOp - 1] < weightTemp) { weight[topOp] = weightTemp; operator[topOp] = ch; topOp++; // 否则将堆栈中运算符逐个取出,直到当前堆栈顶部运算符的优先级小于当前运算符 } else { while (topOp > 0 && weight[topOp - 1] >= weightTemp) { switch (operator[topOp - 1]) { // 取出数字数组的相应元素进行运算 case '+': number[topNum - 2] += number[topNum - 1]; break; case '-': number[topNum - 2] -= number[topNum - 1]; break; case '×': number[topNum - 2] *= number[topNum - 1]; break; // 判断除数为0的情况 case '÷': if (number[topNum - 1] == 0) { showError(1, str_old); return; } number[topNum - 2] /= number[topNum - 1]; break; case '√': if (number[topNum - 1] == 0 || (number[topNum - 2] < 0 && number[topNum - 1] % 2 == 0)) { showError(2, str_old); return; } number[topNum - 2] = Math.pow( number[topNum - 2], 1 / number[topNum - 1]); break; case '^': number[topNum - 2] = Math.pow( number[topNum - 2], number[topNum - 1]); break; // 计算时进行角度弧度的判断及转换 // sin case 's': if (drg_flag == true) { number[topNum - 1] = Math .sin((number[topNum - 1] / 180) * pi); } else { number[topNum - 1] = Math .sin(number[topNum - 1]); } topNum++; break; // cos case 'c': if (drg_flag == true) { number[topNum - 1] = Math .cos((number[topNum - 1] / 180) * pi); } else { number[topNum - 1] = Math .cos(number[topNum - 1]); } topNum++; break; // tan case 't': if (drg_flag == true) { if ((Math.abs(number[topNum - 1]) / 90) % 2 == 1) { showError(2, str_old); return; } number[topNum - 1] = Math .tan((number[topNum - 1] / 180) * pi); } else { if ((Math.abs(number[topNum - 1]) / (pi / 2)) % 2 == 1) { showError(2, str_old); return; } number[topNum - 1] = Math .tan(number[topNum - 1]); } topNum++; break; // log case 'g': if (number[topNum - 1] <= 0) { showError(2, str_old); return; } number[topNum - 1] = Math .log10(number[topNum - 1]); topNum++; break; // ln case 'l': if (number[topNum - 1] <= 0) { showError(2, str_old); return; } number[topNum - 1] = Math .log(number[topNum - 1]); topNum++; break; // 阶乘 case '!': if (number[topNum - 1] > 170) { showError(3, str_old); return; } else if (number[topNum - 1] < 0) { showError(2, str_old); return; } number[topNum - 1] = N(number[topNum - 1]); topNum++; break; } // 继续取堆栈的下一个元素进行判断 topNum--; topOp--; } // 将运算符如堆栈 weight[topOp] = weightTemp; operator[topOp] = ch; topOp++; } } i++; } // 依次取出堆栈的运算符进行运算 while (topOp > 0) { // +-x直接将数组的后两位数取出运算 switch (operator[topOp - 1]) { case '+': number[topNum - 2] += number[topNum - 1]; break; case '-': number[topNum - 2] -= number[topNum - 1]; break; case '×': number[topNum - 2] *= number[topNum - 1]; break; // 涉及到除法时要考虑除数不能为零的情况 case '÷': if (number[topNum - 1] == 0) { showError(1, str_old); return; } number[topNum - 2] /= number[topNum - 1]; break; case '√': if (number[topNum - 1] == 0 || (number[topNum - 2] < 0 && number[topNum - 1] % 2 == 0)) { showError(2, str_old); return; } number[topNum - 2] = Math.pow(number[topNum - 2], 1 / number[topNum - 1]); break; case '^': number[topNum - 2] = Math.pow(number[topNum - 2], number[topNum - 1]); break; // sin case 's': if (drg_flag == true) { number[topNum - 1] = Math .sin((number[topNum - 1] / 180) * pi); } else { number[topNum - 1] = Math.sin(number[topNum - 1]); } topNum++; break; // cos case 'c': if (drg_flag == true) { number[topNum - 1] = Math .cos((number[topNum - 1] / 180) * pi); } else { number[topNum - 1] = Math.cos(number[topNum - 1]); } topNum++; break; // tan case 't': if (drg_flag == true) { if ((Math.abs(number[topNum - 1]) / 90) % 2 == 1) { showError(2, str_old); return; } number[topNum - 1] = Math .tan((number[topNum - 1] / 180) * pi); } else { if ((Math.abs(number[topNum - 1]) / (pi / 2)) % 2 == 1) { showError(2, str_old); return; } number[topNum - 1] = Math.tan(number[topNum - 1]); } topNum++; break; // 对数log case 'g': if (number[topNum - 1] <= 0) { showError(2, str_old); return; } number[topNum - 1] = Math.log10(number[topNum - 1]); topNum++; break; // 自然对数ln case 'l': if (number[topNum - 1] <= 0) { showError(2, str_old); return; } number[topNum - 1] = Math.log(number[topNum - 1]); topNum++; break; // 阶乘 case '!': if (number[topNum - 1] > 170) { showError(3, str_old); return; } else if (number[topNum - 1] < 0) { showError(2, str_old); return; } number[topNum - 1] = N(number[topNum - 1]); topNum++; break; } // 取堆栈下一个元素计算 topNum--; topOp--; } // 如果是数字太大,提示错误信息 if (number[0] > 7.3E306) { showError(3, str_old); return; } // 输出最终结果 input.setText(String.valueOf(FP(number[0]))); tip.setText("计算完毕,要继续请按归零键 C"); mem.setText(str_old + "=" + String.valueOf(FP(number[0]))); } /* * FP = floating point 控制小数位数,达到精度 否则会出现 * 0.6-0.2=0.39999999999999997的情况,用FP即可解决,使得数为0.4 本格式精度为15位 */ public double FP(double n) { // NumberFormat format=NumberFormat.getInstance(); //创建一个格式化类f // format.setMaximumFractionDigits(18); //设置小数位的格式 // DecimalFormat format = new DecimalFormat("0.#############"); Double re = n; String s = round(re.toString(),DEF_DIV_SCALE[0]); return Double.parseDouble(s); } /* * 阶乘算法 */ public double N(double n) { int i = 0; double sum = 1; // 依次将小于等于n的值相乘 for (i = 1; i <= n; i++) { sum = sum * i; } return sum; } /* * 错误提示,按了"="之后,若计算式在process()过程中,出现错误,则进行提示 */ public void showError(int code, String str) { String message = ""; switch (code) { case 1: message = "零不能作除数"; break; case 2: message = "函数格式错误"; break; case 3: message = "值太大了,超出范围"; } input.setText("\"" + str + "\"" + ": " + message); tip.setText(message + "\n" + "计算完毕,要继续请按归零键 C"); } } /** *保存切换页面时EditEext中的值 */ @Override //这种方式保存数据只是临时保存,无法永久保存 protected void onSaveInstanceState(@NonNull Bundle outState) { //该函数用于提取出历史数据,保存到outState中 super.onSaveInstanceState(outState); init[0] = input.getText().toString(); outState.putString("exp",init[0]); } /** *舍入精度 */ public static String round(String v, int scale) { if (scale < 0) { throw new IllegalArgumentException( "The scale must be a positive integer or zero"); } BigDecimal b = new BigDecimal(v); BigDecimal one = new BigDecimal("1"); BigDecimal re = b.divide(one, scale, BigDecimal.ROUND_HALF_UP); return re.toString(); } // @Override // public boolean onCreateOptionsMenu(Menu menu) { // // Inflate the menu; this adds items to the action bar if it is present. // getMenuInflater().inflate(R.menu.main, menu); // return true; // } /** *音量键事件 */ @Override public boolean onKeyDown (int keyCode, KeyEvent event) { String s = input.getText().toString(); if(s.length()<1){ }else { switch (keyCode) { // 音量减小 case KeyEvent.KEYCODE_VOLUME_DOWN: if(DEF_DIV_SCALE[0]>1) DEF_DIV_SCALE[0]--; seekBar.setProgress(DEF_DIV_SCALE[0]); Toast.makeText(this.getApplicationContext(), "DOWN " + DEF_DIV_SCALE[0], Toast.LENGTH_SHORT).show(); if(s.contains(".")) input.setText(round(s,DEF_DIV_SCALE[0])); // 音量减小时应该执行的功能代码 return true; // 音量增大 case KeyEvent.KEYCODE_VOLUME_UP: if(DEF_DIV_SCALE[0]<40) DEF_DIV_SCALE[0]++; seekBar.setProgress(DEF_DIV_SCALE[0]); Toast.makeText(this.getApplicationContext(), "UP " + DEF_DIV_SCALE[0], Toast.LENGTH_SHORT).show(); if(s.contains(".")) input.setText(round(s,DEF_DIV_SCALE[0])); // 音量增大时应该执行的功能代码 return true; } } return super.onKeyDown (keyCode, event); } /** * 滑动条事件 */ public SeekBar.OnSeekBarChangeListener onSeekBarChangeListener = new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { //txt_cur.setText("当前进度值:" + progress + " / 100 "); String s = input.getText().toString(); if(s.length()<1){ return; }else{ if(progress>DEF_DIV_SCALE[0]){ DEF_DIV_SCALE[0] = progress; Toast.makeText(getApplicationContext(), "UP " + DEF_DIV_SCALE[0], Toast.LENGTH_SHORT).show(); if(s.contains(".")) input.setText(round(s,DEF_DIV_SCALE[0])); }else if(progress<DEF_DIV_SCALE[0]){ DEF_DIV_SCALE[0] = progress; Toast.makeText(getApplicationContext(), "DOWN " + DEF_DIV_SCALE[0], Toast.LENGTH_SHORT).show(); if(s.contains(".")) input.setText(round(s,DEF_DIV_SCALE[0])); } } } @Override public void onStartTrackingTouch(SeekBar seekBar) { //Toast.makeText(mContext, "触碰SeekBar", Toast.LENGTH_SHORT).show(); } @Override public void onStopTrackingTouch(SeekBar seekBar) { //Toast.makeText(mContext, "放开SeekBar", Toast.LENGTH_SHORT).show(); } }; /** * 二进制2十进制 */ public int BinaryToDecimal(String s){ int binaryNumber = Integer.valueOf(s); int decimal = 0; int p = 0; while(true){ if(binaryNumber == 0){ break; } else { int temp = binaryNumber%10; decimal += temp*Math.pow(2, p); binaryNumber = binaryNumber/10; p++; } } return decimal; } /** *十进制2二进制 */ }
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