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小编给大家分享一下Android如何实现自定义手势和识别手势的功能,相信大部分人都还不怎么了解,因此分享这篇文章给大家参考一下,希望大家阅读完这篇文章后大有收获,下面让我们一起去了解一下吧!
1. 先完成自定义手势的Activity
1.1 因为需要存储手势文件所以需要声明权限:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> //读取SD卡权限 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> //写入SD卡权限
1.2 简单写一个布局文件,其中用到了GestureOverlayView,相当于一个绘制组件。其中有一个重要属性gestureStrokeType,值为single时表示只绘制一笔,若要多笔绘制值应该设为multiple:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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:orientation="vertical" tools:context=".addgesture.Main3Activity"> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="recognition" android:text="识别手势" /> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:text="请绘制手势" /> <android.gesture.GestureOverlayView android:id="@+id/activity_main3_gov" android:layout_width="match_parent" android:layout_height="match_parent" android:gestureStrokeType="multiple" //多笔绘制 ></android.gesture.GestureOverlayView> </LinearLayout>
1.3 这里自定义了AlertDialog的样式;
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <TextView android:layout_width="wrap_content" android:layout_height="match_parent" android:gravity="center" android:text="请输入手势名称" /> <EditText //输入手势的名称 android:id="@+id/save_dialog_et" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout> <ImageView //展示绘制的手势 android:id="@+id/save_dialog_iv" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout>
1.4 代码部分:
package com.example.mygesture.addgesture; import android.Manifest; import android.content.DialogInterface; import android.content.Intent; import android.content.pm.PackageManager; import android.gesture.Gesture; import android.gesture.GestureLibraries; import android.gesture.GestureLibrary; import android.gesture.GestureOverlayView; import android.graphics.Bitmap; import android.graphics.Color; import android.support.v4.app.ActivityCompat; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.EditText; import android.widget.ImageView; import android.widget.Toast; import com.example.mygesture.R; import com.example.mygesture.recognitiongesture.Main4Activity; public class Main3Activity extends AppCompatActivity { GestureOverlayView gov; //定义绘制组件 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main3); if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1); } //高版本需要动态申请权限 init(); } private void init() { gov = findViewById(R.id.activity_main3_gov); // gov.setGestureColor(Color.RED); //设置绘制的颜色 gov.setGestureStrokeWidth(4); //设置画笔的宽度 gov.addOnGesturePerformedListener(new GestureOverlayView.OnGesturePerformedListener() { //设置绘制完成监听 @Override public void onGesturePerformed(GestureOverlayView overlay, final Gesture gesture) { View saveDialog = getLayoutInflater().inflate(R.layout.save_dialog, null); //获取AlertDialog的布局样式 final EditText editText = saveDialog.findViewById(R.id.save_dialog_et); ImageView imageView = saveDialog.findViewById(R.id.save_dialog_iv); Bitmap bitmap = gesture.toBitmap(128, 128, 10, 0xFFFF0000); //将手势转换为位图 imageView.setImageBitmap(bitmap); //用ImageView加载手势图片 new AlertDialog.Builder(Main3Activity.this).setView(saveDialog).setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { GestureLibrary gestureLibrary = GestureLibraries.fromFile("/mnt/sdcard/mygesture");//利用手势库获取存放手势文件的地址 gestureLibrary.addGesture(editText.getText().toString(), gesture); //向手势库中添加手势名称和手势 gestureLibrary.save(); //保存手势库 Toast.makeText(Main3Activity.this, "保存成功", Toast.LENGTH_SHORT).show(); } }).setNegativeButton("取消", null) .show(); } }); } public void recognition(View view) { Intent intent = new Intent(this, Main4Activity.class); startActivity(intent); } }
2. 接下来完成识别手势的Activity:
2.1 一样的先写布局文件
<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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:orientation="vertical" tools:context=".recognitiongesture.Main4Activity"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:text="请绘制需要识别的手势" /> <android.gesture.GestureOverlayView android:id="@+id/activity_main4_gov" android:layout_width="match_parent" android:layout_height="match_parent"></android.gesture.GestureOverlayView> </LinearLayout>
2.2 代码的编写
package com.example.mygesture.recognitiongesture; import android.gesture.Gesture; import android.gesture.GestureLibraries; import android.gesture.GestureLibrary; import android.gesture.GestureOverlayView; import android.gesture.Prediction; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.ArrayAdapter; import android.widget.Toast; import com.example.mygesture.R; import java.util.ArrayList; import java.util.logging.Level; public class Main4Activity extends AppCompatActivity { GestureOverlayView gov; GestureLibrary gestureLibrary; //定义手势库 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main4); init(); } private void init() { gestureLibrary = GestureLibraries.fromFile("/mnt/sdcard/mygesture"); //获取手势文件 if (gestureLibrary.load()) { //判断手势文件是否存在以及加载 Toast.makeText(this, "手势文件加载成功", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(this, "手势文件加载失败", Toast.LENGTH_SHORT).show(); } gov = findViewById(R.id.activity_main4_gov); gov.addOnGesturePerformedListener(new GestureOverlayView.OnGesturePerformedListener() { @Override public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) { ArrayList<Prediction> predictions = gestureLibrary.recognize(gesture); //匹配手势库中的所有手势 ArrayList<String> result = new ArrayList<>(); //匹配结果数组 for (Prediction pred : predictions) { if (pred.score > 2) { //匹配手势库中的所有手势,并将相似度>2存入匹配结果数组 result.add("相似度:" + pred.score); } } if (result.size() > 0) { //这里用了适配器来作为AlertDialog的布局样式,用于显示所有手势的相似度 ArrayAdapter<Object> arrayAdapter = new ArrayAdapter<Object>(Main4Activity.this, android.R.layout.simple_dropdown_item_1line, result.toArray()); new AlertDialog.Builder(Main4Activity.this).setAdapter(arrayAdapter, null).setPositiveButton("确定", null).show(); } else { Toast.makeText(Main4Activity.this, "未找到与之匹配的手势", Toast.LENGTH_SHORT).show(); } } }); } }
以上是“Android如何实现自定义手势和识别手势的功能”这篇文章的所有内容,感谢各位的阅读!相信大家都有了一定的了解,希望分享的内容对大家有所帮助,如果还想学习更多知识,欢迎关注亿速云行业资讯频道!
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