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最近做项目,碰到如下的需求:ViewPager分页,如果是6页(包括6页)就用圆点,如果是6页以上就用进度条来切换。前面一种交互方法最常见,用小圆点来表示当前选中的页面,这些小圆点称为导航点,很多App都是这种实现方式。当用户第一次安装或升级应用时,都会利用导航页面告诉用户当前版本的主要亮点,一般情况下当行页面有三部分组成,背景图片,导航文字和滑动的原点,即下面的效果:
这里就不作详细的讲解,大家可以参考我以前写过的博客:
ViewPager实现图片轮翻效果
今天来实现ViewPager进度条切换,主要逻辑如下:
MainActivity.java
package com.jackie.slidebarviewdemo.activity; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.widget.TextView; import com.jackie.slidebarviewdemo.R; import com.jackie.slidebarviewdemo.widget.SlideBarView; public class MainActivity extends AppCompatActivity { private SlideBarView mSlideBarView; private TextView mTextView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mSlideBarView = (SlideBarView) findViewById(R.id.slide_bar); mTextView = (TextView) findViewById(R.id.text_view); mSlideBarView.setTotalPage(80); mSlideBarView.setOnSlideChangeListener(new SlideBarView.OnSlideChangeListener() { @Override public void onSlideChange(int page) { mTextView.setText("当前是第" + page + "页"); } }); } }
SlideBarView.java
package com.jackie.slidebarviewdemo.widget; import android.content.Context; import android.util.AttributeSet; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.widget.LinearLayout; import android.widget.PopupWindow; import android.widget.RelativeLayout; import android.widget.TextView; import com.jackie.slidebarviewdemo.R; import com.jackie.slidebarviewdemo.utils.ConvertUtils; /** * Created by Jackie on 2017/1/17. */ public class SlideBarView extends RelativeLayout { private LayoutInflater mInflater; private RelativeLayout mSlideBarView; private View mSlideBarBlock; private PopupWindow mPopupWindow; private TextView mPopupText; private int mDp40; private String mBound = "no"; // no表示没到边界,left为到左边界了,right表示到右边界了 public interface OnSlideChangeListener { void onSlideChange(int page); } private OnSlideChangeListener mOnSlideChangeListener; public void setOnSlideChangeListener(OnSlideChangeListener onSlideChangeListener) { this.mOnSlideChangeListener = onSlideChangeListener; } public SlideBarView(Context context) { this(context, null); } public SlideBarView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SlideBarView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context); initEvent(); } private void init(Context context) { mInflater = LayoutInflater.from(context); View slideBar = mInflater.inflate(R.layout.slide_bar, null); LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); addView(slideBar, params); mSlideBarView = (RelativeLayout) slideBar.findViewById(R.id.slide_bar_view); mSlideBarBlock = slideBar.findViewById(R.id.slide_bar_block); mDp40 = ConvertUtils.dip2px(context, 40); } private void initEvent() { mSlideBarView.setOnTouchListener(new OnTouchListener() { int currentX = 0; int startX = 0; @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: currentX = (int) event.getX(); startX = (int) event.getX(); // 设置滑块的滑动, 手指第一次点下去把滑块放到手指上 int downLeft = currentX - mSlideBarBlock.getMeasuredWidth() / 2; int downTop = mSlideBarBlock.getTop(); int downRight = downLeft + mSlideBarBlock.getWidth(); int downBottom = mSlideBarBlock.getBottom(); //边界检测 if (downLeft < 0) { downLeft = 0; downRight = mSlideBarBlock.getMeasuredWidth(); } else if (downRight > mSlideBarView.getMeasuredWidth()) { downLeft = mSlideBarView.getMeasuredWidth() - mSlideBarBlock.getMeasuredWidth(); downRight = mSlideBarView.getMeasuredWidth(); } mSlideBarBlock.layout(downLeft, downTop, downRight, downBottom); break; case MotionEvent.ACTION_MOVE: currentX = (int) event.getX(); int currentPage = currentX * mTotalPage / mSlideBarView.getMeasuredWidth(); if (currentPage < 0) { currentPage = 0; } else if (currentPage > mTotalPage) { currentPage = mTotalPage; } // 设置滑块的滑动 int moveLeft = currentX - mSlideBarBlock.getMeasuredWidth() / 2; int moveTop = mSlideBarBlock.getTop(); int moveRight = moveLeft + mSlideBarBlock.getMeasuredWidth(); int moveBottom = mSlideBarBlock.getBottom(); //边界处理 if (moveLeft < 0) { mBound = "left"; moveLeft = 0; moveRight = mSlideBarBlock.getMeasuredWidth(); } else if (moveRight >= mSlideBarView.getMeasuredWidth()) { mBound = "right"; moveLeft = mSlideBarView.getMeasuredWidth() - mSlideBarBlock.getMeasuredWidth(); moveRight = mSlideBarView.getMeasuredWidth(); } else { mBound = "no"; } mSlideBarBlock.layout(moveLeft, moveTop, moveRight, moveBottom); startX = currentX; //设置popupWindow的弹出位置 if (mOnSlideChangeListener != null) { if (currentPage == mTotalPage) { //防止ViewPager越界 currentPage = mTotalPage - 1; } mOnSlideChangeListener.onSlideChange(currentPage); if (mPopupWindow != null) { mPopupText.setText(currentPage + ""); //设置PopupWindow的滑动 if (!mPopupWindow.isShowing()) { int[] location = new int[2]; mSlideBarView.getLocationInWindow(location); mPopupWindow.showAsDropDown(mSlideBarView, currentX, location[1] - mDp40); } else { if ("no".equals(mBound)) { int[] location = new int[2] ; mSlideBarView.getLocationInWindow(location); mPopupWindow.update(currentX, location[1] - mDp40, mPopupWindow.getWidth(), mPopupWindow.getHeight(), true); } } } } break; case MotionEvent.ACTION_UP: currentX = 0; startX = 0; mPopupWindow.dismiss(); break; } return true; } }); // 初始化PopupWindow View contentView = mInflater.inflate(R.layout.popup_window, null); mPopupText = (TextView) contentView.findViewById(R.id.popup_text); mPopupWindow = new PopupWindow(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); mPopupWindow.setContentView(contentView); mPopupWindow.setOutsideTouchable(true); mPopupWindow.setBackgroundDrawable(getResources().getDrawable(R.mipmap.popup_window_bg)); mPopupWindow.setAnimationStyle(0); } int mTotalPage = 0; public void setTotalPage(int totalPage) { this.mTotalPage = totalPage; } }
相关的单位转化工具,大家可以拷贝到自己的项目中直接使用。
ConvertUtils.java
package com.jackie.slidebarviewdemo.utils; import android.content.Context; public class ConvertUtils { public static int dip2px(Context context, float dpValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); } public static int px2dip(Context context, float pxValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (pxValue / scale + 0.5f); } public static int px2sp(Context context, float pxValue) { final float fontScale = context.getResources().getDisplayMetrics().scaledDensity; return (int) (pxValue / fontScale + 0.5f); } public static int sp2px(Context context, float spValue) { final float fontScale = context.getResources().getDisplayMetrics().scaledDensity; return (int) (spValue * fontScale + 0.5f); } }
自定义组合控件,然后实现相关的手势,思路很清晰,代码也很详细,这里就直接贴代码了。
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerInParent="true" android:orientation="vertical"> <com.jackie.slidebarviewdemo.widget.SlideBarView android:id="@+id/slide_bar" android:layout_width="match_parent" android:layout_height="50dp" android:layout_marginLeft="20dp" android:layout_marginRight="20dp"/> <TextView android:id="@+id/text_view" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:layout_marginTop="20dp" android:textColor="#000" android:textSize="20dp" android:text="当前是第0页"/> </LinearLayout> </RelativeLayout>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <RelativeLayout android:id="@+id/slide_bar_view" android:layout_width="match_parent" android:layout_height="50dp"> <View android:layout_width="match_parent" android:layout_height="5dp" android:layout_centerInParent="true" android:background="@drawable/shape_slide_bar_bg"/> <View android:id="@+id/slide_bar_block" android:layout_width="20dp" android:layout_height="14dp" android:background="#b9b9b9" android:layout_centerVertical="true" /> </RelativeLayout> </RelativeLayout>
popup_window.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <RelativeLayout android:layout_width="30dp" android:layout_height="30dp"> <TextView android:id="@+id/popup_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="#fff" android:textSize="16dp" android:gravity="center" android:layout_centerInParent="true" /> </RelativeLayout> </RelativeLayout>
附上相关的资源文件:
shape_slide_bar_bg.xml
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <solid android:color="#dcdcdc" /> <corners android:radius="1dp"/> </shape>
popup_window_bg.9.png
效果如下:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持亿速云。
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