Android实现自定义手势和识别手势的功能

<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

<?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 

<?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 

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);
}
}

<?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 

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();
}
}
});
}
}