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
以上所述是小编给大家介绍的Android实现自定义手势和识别手势的功能,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对w3xue网站的支持!
如果你觉得本文对你有帮助,欢迎转载,烦请注明出处,谢谢!