如何在ImageView上實現自定義手勢？

Question

我通過以下「標準」代碼成功實現了活動級別的自定義手勢。所以整個屏幕對手勢「起反應」。

但是我希望能夠在特定的ImageView上完成自定義手勢。可能嗎？

感謝

public class DisplayMultiImageActivity extends Activity implements OnGesturePerformedListener { 

    GestureLibrary mLibrary; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_display_multiimage); 

     mLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures); 
     if (!mLibrary.load()) { 
      finish(); 
     } 

     GestureOverlayView gestures = (GestureOverlayView) findViewById(R.id.gestures); 
     gestures.addOnGesturePerformedListener(this); 

    } 

    @Override 
    public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) { 
     ArrayList<Prediction> predictions = mLibrary.recognize(gesture); 
     if (predictions.size() > 0 && predictions.get(0).score > 1.0) { 
      String result = predictions.get(0).name; 

      if ("mycustomgesture".equalsIgnoreCase(result)) { 
       Toast.makeText(this, "Custom gesture detected!!", Toast.LENGTH_LONG).show(); 
      } 
     } 
    } 

} 

Answer 1

在你的XML文件中，GestureOverlayView大概佔據了整個屏幕。如果您希望它僅對ImageView上的手勢做出反應，則應該在ImageView之上設置GestureOverlayView。

<android.gesture.GestureOverlayView 
     android:id="@+id/gestures" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content"> 

     <ImageView 
      // attributes of ImageView /> 

</android.gesture.GestureOverlayView> 

EDIT

的onGesturePerformedListener接收在其上的方法onGesturePerformed(GestureOverlayView, Gesture)進行了手勢的GestureOverlayView。

在此方法中，檢查使用了哪個GestureOverlayView，並執行相關操作。

所以你應該在你想跟蹤手勢的每個ImageView上設置一個不同的GestureOverlayView。

@Override 
    public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) { 
      switch(overlay.getId()) { 
      case (R.id.overlay1): 
       \\ DO SOMETHING WITH IMAGEVIEW 1 
       break; 
      case (R.id.overlay2): 
       \\ DO SOMETHING WITH IMAGEVIEW 2 
       break; 
      case (R.id.overlay3): 
       \\ DO SOMETHING WITH IMAGEVIEW 3 
       break; 
      default: 
       \\ 
      } 
    }