Android实现自定义手势和识别手势的功能
时间：2021-01-24 11:06:24|栏目：Android代码|点击： 次
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();
}
}
});
}
}
总结
栏 目：Android代码
本文地址：http://www.codeinn.net/misctech/50124.html
