Android使用GestureOverlayView控件实现手势识别

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="fill_parent" 
 android:layout_height="fill_parent" 
 android:orientation="vertical" > 
 
 <android.gesture.GestureOverlayView 
  android:id="@+id/gestures" 
  android:layout_width="fill_parent" 
  android:layout_height="0dip" 
  android:layout_weight="1.0" 
  android:gestureStrokeType="multiple" /> 
 
</LinearLayout> 

public class MainActivity extends Activity { 
 private boolean success; 
 // 定义手势库 
 private GestureLibrary library; 
 private GestureOverlayView gestureView; 
 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.main); 
  // 找到手势库 
  library = GestureLibraries.fromRawResource(this, R.raw.gestures); 
  // 加载手势库 
  success = library.load(); 
  gestureView = (GestureOverlayView) this.findViewById(R.id.gestures); 
  // 添加事件监听器 
  gestureView.addOnGesturePerformedListener(new GestureListener()); 
 } 
 
 private final class GestureListener implements OnGesturePerformedListener { 
  @Override 
  public void onGesturePerformed(GestureOverlayView overlay, 
    Gesture gesture) { 
   // 如果手势库加载成功 
   if (success) { 
    // 从手势库中查找匹配的手势,最匹配的记录会放在最前面 
    ArrayList<Prediction> predictions = library.recognize(gesture); 
    if (!predictions.isEmpty()) { 
     // 获取第一个匹配的手势 
     Prediction prediction = predictions.get(0); 
     // 如果匹配度>30%，就执行下面的操作 
     if (prediction.score > 3) { 
      // 关闭应用 
      if ("agree".equals(prediction.name)) { 
       android.os.Process.killProcess(android.os.Process 
         .myPid()); 
      // 拨打电话 
      } else if ("5556".equals(prediction.name)) { 
       Intent intent = new Intent(Intent.ACTION_CALL, 
         Uri.parse("tel:5556")); 
       startActivity(intent); 
      } 
     } 
    } 
   } 
  } 
 
 } 
}