初学Android,从手势库识别手势(五十一)

接着上一篇，学习一下怎么识别手势，
首先还是要向AndroidManifest.xml添加SD卡的读写权限

[html] view plain copy print ?

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

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"><!-- 使用手势编辑组件 --><android.gesture.GestureOverlayViewandroid:id="@+id/gesture"android:layout_width="fill_parent"android:layout_height="fill_parent"android:gestureStrokeType="multiple" /></LinearLayout>

result.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"><ListView android:id="@+id/show"android:layout_width="fill_parent"android:layout_height="fill_parent"/></LinearLayout>

主界面代码

package WangLi.IO.RecogniseGesture;import java.util.ArrayList;import android.app.Activity;import android.app.AlertDialog;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.os.Bundle;import android.widget.ArrayAdapter;import android.widget.Toast;public class RecogniseGesture extends Activity{// 定义手势编辑组件GestureOverlayView gestureView;// 记录手机上已有的手势库GestureLibrary gestureLibrary;@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);// 读取上一个程序所创建的手势库gestureLibrary = GestureLibraries.fromFile("/sdcard/mygestures");if (gestureLibrary.load()){Toast.makeText(RecogniseGesture.this,"手势文件装载成功！" ,8000).show();}else{Toast.makeText(RecogniseGesture.this,"手势文件装载失败！" ,8000).show();}// 获取手势编辑组件gestureView = (GestureOverlayView) findViewById(R.id.gesture);// 为手势编辑组件绑定事件监听器gestureView.addOnGesturePerformedListener(new OnGesturePerformedListener(){@Overridepublic void onGesturePerformed(GestureOverlayView overlay,Gesture gesture){// 识别用户刚刚所绘制的手势ArrayList<Prediction> predictions = gestureLibrary.recognize(gesture);ArrayList<String> result = new ArrayList<String>();//遍历所有找到的Prediction对象for (Prediction pred : predictions){// 只有相似度大于2.0的手势才会被输出if (pred.score > 2.0){result.add("与手势【" + pred.name + "】相似度为"+ pred.score);}}if (result.size() > 0){ArrayAdapter adapter = new ArrayAdapter(RecogniseGesture.this,android.R.layout.simple_dropdown_item_1line, result.toArray());// 使用一个带List的对话框来显示所有匹配的手势new AlertDialog.Builder(RecogniseGesture.this).setAdapter(adapter, null).setPositiveButton("确定", null).show();}else{Toast.makeText(RecogniseGesture.this,"无法找到能匹配的手势！" ,8000).show();}}});}}

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