Android实现自定义手势和识别手势的功能

2023-08-12 00:06:04 89

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：

//读取SD卡权限
//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：

1.3这里自定义了AlertDialog的样式；

1.4代码部分：

packagecom.example.mygesture.addgesture;
importandroid.Manifest;
importandroid.content.DialogInterface;
importandroid.content.Intent;
importandroid.content.pm.PackageManager;
importandroid.gesture.Gesture;
importandroid.gesture.GestureLibraries;
importandroid.gesture.GestureLibrary;
importandroid.gesture.GestureOverlayView;
importandroid.graphics.Bitmap;
importandroid.graphics.Color;
importandroid.support.v4.app.ActivityCompat;
importandroid.support.v7.app.AlertDialog;
importandroid.support.v7.app.AppCompatActivity;
importandroid.os.Bundle;
importandroid.view.View;
importandroid.widget.EditText;
importandroid.widget.ImageView;
importandroid.widget.Toast;
importcom.example.mygesture.R;
importcom.example.mygesture.recognitiongesture.Main4Activity;
publicclassMain3ActivityextendsAppCompatActivity{
GestureOverlayViewgov;//定义绘制组件
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
if(ActivityCompat.checkSelfPermission(this,Manifest.permission.READ_EXTERNAL_STORAGE)!=PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(this,newString[]{Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE},1);
}//高版本需要动态申请权限
init();
}
privatevoidinit(){
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(newGestureOverlayView.OnGesturePerformedListener(){//设置绘制完成监听
@Override
publicvoidonGesturePerformed(GestureOverlayViewoverlay,finalGesturegesture){
ViewsaveDialog=getLayoutInflater().inflate(R.layout.save_dialog,null);//获取AlertDialog的布局样式
finalEditTexteditText=saveDialog.findViewById(R.id.save_dialog_et);
ImageViewimageView=saveDialog.findViewById(R.id.save_dialog_iv);
Bitmapbitmap=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
newAlertDialog.Builder(Main3Activity.this).setView(saveDialog).setPositiveButton("确定",newDialogInterface.OnClickListener(){
@Override
publicvoidonClick(DialogInterfacedialog,intwhich){
GestureLibrarygestureLibrary=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();
}
});
}
publicvoidrecognition(Viewview){
Intentintent=newIntent(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

2.2代码的编写

packagecom.example.mygesture.recognitiongesture;
importandroid.gesture.Gesture;
importandroid.gesture.GestureLibraries;
importandroid.gesture.GestureLibrary;
importandroid.gesture.GestureOverlayView;
importandroid.gesture.Prediction;
importandroid.support.v7.app.AlertDialog;
importandroid.support.v7.app.AppCompatActivity;
importandroid.os.Bundle;
importandroid.widget.ArrayAdapter;
importandroid.widget.Toast;
importcom.example.mygesture.R;
importjava.util.ArrayList;
importjava.util.logging.Level;
publicclassMain4ActivityextendsAppCompatActivity{
GestureOverlayViewgov;
GestureLibrarygestureLibrary;//定义手势库
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main4);
init();
}
privatevoidinit(){
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(newGestureOverlayView.OnGesturePerformedListener(){
@Override
publicvoidonGesturePerformed(GestureOverlayViewoverlay,Gesturegesture){
ArrayListpredictions=gestureLibrary.recognize(gesture);//匹配手势库中的所有手势
ArrayListresult=newArrayList<>();//匹配结果数组
for(Predictionpred: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

Android实现自定义手势和识别手势的功能

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