android 手势识别代码

手势创建主要用到GestureOverlayView和GestureLibrary。GestureOverlayView的父类，GestureLibrary类主要对手势进行保存、删除等操作的，存放手势的仓库。

工程目录：

1、首先先生成手势库，自己绘制喜欢的手势，然后命名好保存。详细代码如下

package com.example.gesture;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.gesture.Gesture;import android.gesture.GestureLibraries;import android.gesture.GestureLibrary;import android.gesture.GestureOverlayView;import android.gesture.GestureOverlayView.OnGesturePerformedListener;import android.graphics.Bitmap;import android.graphics.Color;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.widget.EditText;import android.widget.ImageView;import android.widget.Toast;public class drawActivity extends Activity {    private GestureOverlayView gestureView;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.drawgesture);initUI();}private void initUI() {// TODO Auto-generated method stub gestureView = (GestureOverlayView) findViewById(R.id.gesture); // 设置手势的绘制颜色       gestureView.setGestureColor(Color.RED);       // 设置手势的绘制宽度       gestureView.setGestureStrokeWidth(5);    // gestureView.setGestureColor(0xff009966);//设置画笔颜色    // gestureView.setFadeOffset(2000);//两个笔画之间的时间间隔     // 为gesture的手势完成事件绑定事件监听器       gestureView.addOnGesturePerformedListener(new OnGesturePerformedListener() {@Overridepublic void onGesturePerformed(GestureOverlayView overlay,final Gesture gesture) {// TODO Auto-generated method stubAlertDialog.Builder builder = new AlertDialog.Builder(drawActivity.this);LayoutInflater inflater = getLayoutInflater();    final View layout = inflater.inflate(R.layout.savegesture, null);        ImageView image = (ImageView)layout.findViewById(R.id.show);// 根据Gesture包含的手势创建一个位图                  Bitmap bitmap = gesture.toBitmap(128, 128, 10, 0xFFFF0000);                  image.setImageBitmap(bitmap);                     builder.setView(layout);    builder.setIcon(R.drawable.ic_launcher);builder.setTitle(R.string.title);builder.setPositiveButton("ok", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface arg0, int arg1) {// TODO Auto-generated method stubEditText edit = (EditText)layout.findViewById(R.id.gesture_name); // 获取指定文件对应的手势库                          GestureLibrary gestureLib = GestureLibraries                              .fromFile("/sdcard/gestures");                         // 添加手势                          gestureLib.addGesture(edit.getText().toString(),gesture);                          // 保存手势库                          gestureLib.save();                          Toast.makeText(getApplicationContext(), "手势保存成功！", Toast.LENGTH_SHORT).show();}});builder.setNeutralButton("cancel", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface arg0, int arg1) {// TODO Auto-generated method stub}});final AlertDialog dlg = builder.create();dlg.show();}});}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();}}

代码布局为：

<?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" >        <TextView      android:layout_width="fill_parent"      android:layout_height="wrap_content"    android:gravity="center_horizontal"      android:text="@string/ad"/>  <!-- 使用手势绘制组件 -->  <android.gesture.GestureOverlayView      android:id="@+id/gesture"      android:layout_width="fill_parent"      android:layout_height="fill_parent"      android:gestureStrokeType="multiple" />  </LinearLayout>

保存手势布局自定义dialog布局

<?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      android:orientation="vertical"      android:layout_width="fill_parent"      android:layout_height="fill_parent">  <LinearLayout      android:orientation="horizontal"      android:layout_width="fill_parent"      android:layout_height="wrap_content">  <TextView      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_marginRight="8dip"      android:text="@string/gesture_name"       />  <!-- 定义一个文本框来让用户输入手势名 -->    <EditText      android:id="@+id/gesture_name"      android:inputType="none"    android:layout_width="fill_parent"      android:layout_height="wrap_content"/>     </LinearLayout>  <!-- 定义一个图片框来显示手势 -->    <ImageView      android:id="@+id/show"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_marginTop="5dp" />  </LinearLayout>

最后还需要添加权限：

<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

2、生成的手势库保存路基可自己定义，gestures为手势库的名字

GestureLibrary gestureLib = GestureLibraries.fromFile("/sdcard/gestures");

3、手势的使用，在res目录下新建一个raw文件，然后添加手势库进来方便调用，首先是先获取手势库，然后对手势的相似度进行判断，可设置大小。最后对之前定义名手势名字进行判断，再执行自己想操作的。详细代码：

package com.example.gesture;import java.util.ArrayList;import android.app.Activity;import android.content.Intent;import android.gesture.Gesture;import android.gesture.GestureLibraries;import android.gesture.GestureLibrary;import android.gesture.GestureOverlayView;import android.gesture.Prediction;import android.gesture.GestureOverlayView.OnGesturePerformedListener;import android.net.Uri;import android.os.Bundle;import android.util.Log;import android.widget.Toast;public class useActivity extends Activity {GestureOverlayView gestureView;    GestureLibrary gLibrary;    boolean loadState;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.usegesture);initUI();}private void initUI() {// TODO Auto-generated method stubgestureView = (GestureOverlayView) this.findViewById(R.id.myGesture);        gestureView.addOnGesturePerformedListener(new MyOnGesturePerformedListener());        // 创建手势库对象GestureLibrary        gLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures);        // 加载手势库资源        loadState = gLibrary.load();}private final class MyOnGesturePerformedListener implements    OnGesturePerformedListener {    public void onGesturePerformed(GestureOverlayView overlay,    Gesture gesture) {    if (loadState) {//加载手势资源成功    // 获取画的图形进行匹配，匹配程度就是Prediction中的score    ArrayList<Prediction> predictions = gLibrary.recognize(gesture);       if (!predictions.isEmpty()) {// 如果用户画了图形，就会匹配Prediction prediction = predictions.get(0);Log.i("TAG", String.valueOf(prediction.score)); //prediction的score属性代表了与手势的相似程度     //prediction的name代表手势对应的字母//这里要求匹配度要在30%以上if (prediction.score > 3) {// 判断相似度大于3，与里面的两者进行匹配                              if ("2".equals(prediction.name)) {//打电话                        Toast.makeText(getApplicationContext(), "手势识别成功!", Toast.LENGTH_LONG).show();                            Intent intent1 = new Intent(Intent.ACTION_CALL,                                        Uri.parse("tel:668301"));                            startActivity(intent1);                                                   }                    } else {// 相似度小于1，不识别                    Toast.makeText(getApplicationContext(), "手势识别率太低，请重新输入!", Toast.LENGTH_LONG).show();//手势识别率低，请重新输入                    }//判断识别度在百分之20以上    if(prediction.score >2){    if("3".equals(prediction.name)){                       Toast.makeText(getApplicationContext(), "手势识别成功!", Toast.LENGTH_LONG).show();                        //showToast(R.string.send);                        Intent intent = new Intent(Intent.ACTION_CALL,Uri.parse("tel:668301"));                        startActivity(intent);                      }    }else {// 相似度小于1，不识别                    Toast.makeText(getApplicationContext(), "手势识别率太低，请重新输入!", Toast.LENGTH_LONG).show();//手势识别率低，请重新输入                    }       } else {//没有画图形    Toast.makeText(getApplicationContext(), "没有手势", Toast.LENGTH_LONG).show();            }    } else {    Toast.makeText(getApplicationContext(), "手势库没有加载成功", Toast.LENGTH_LONG).show();    }    }    }}

实现的布局代码：

<?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" >    <TextView        android:layout_width="fill_parent"        android:gravity="center_horizontal"        android:textSize="20sp"        android:layout_height="wrap_content"        android:text="@string/hello_world" />         <android.gesture.GestureOverlayView         android:id="@+id/myGesture"        android:layout_width="fill_parent"        android:layout_height="0dip"        android:layout_weight="1.0"        /></LinearLayout>

完整的权限代码：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.gesture"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="18" />    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><uses-permission android:name="android.permission.CALL_PHONE"/>      <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.example.gesture.MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity android:name=".drawActivity"></activity>        <activity android:name=".useActivity"></activity>    </application></manifest>

详细代码下载地址：点击打开链接

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