使用PhotoView庫時不會觸發滑動事件

Question

我想實現在我的應用中左右滑動，但是當我使用PhotoView庫時，滑動事件不會觸發。

如何使用PhotoView庫實現滑動操作？

OnSwipeTouchListener.java

import android.content.Context; 
import android.view.GestureDetector; 
import android.view.MotionEvent; 
import android.view.View; 

public class OnSwipeTouchListener implements View.OnTouchListener { 

    private GestureDetector gestureDetector; 
    public OnSwipeTouchListener(Context c) { 
     gestureDetector = new GestureDetector(c, new GestureListener()); 
    } 

    public boolean onTouch(final View view, final MotionEvent motionEvent) { 
     return gestureDetector.onTouchEvent(motionEvent); 
    } 

    private final class GestureListener extends GestureDetector.SimpleOnGestureListener { 

     private static final int SWIPE_THRESHOLD = 100; 
     private static final int SWIPE_VELOCITY_THRESHOLD = 100; 

     @Override 
     public boolean onDown(MotionEvent e) { 
      return true; 
     } 
     // Determines the fling velocity and then fires the appropriate swipe event accordingly 
     @Override 
     public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { 
      boolean result = false; 
      try { 
       float diffY = e2.getY() - e1.getY(); 
       float diffX = e2.getX() - e1.getX(); 
       if (Math.abs(diffX) > Math.abs(diffY)) { 
        if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) { 
         if (diffX > 0) { 
          onSwipeRight(); 
         } else { 
          onSwipeLeft(); 
         } 
        } 
       } else { 
        if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) { 
         if (diffY > 0) { 
          onSwipeDown(); 
         } else { 
          onSwipeUp(); 
         } 
        } 
       } 
      } catch (Exception exception) { 
       exception.printStackTrace(); 
      } 
      return result; 
     } 
    } 
    public void onSwipeRight() { 
    } 

    public void onSwipeLeft() { 
    } 

    public void onSwipeUp() { 
    } 

    public void onSwipeDown() { 
    } 
} 

我的MainActivity這裏我使用SwipeEvent和PhotoView中

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    // Setup Universial Image Loader 
    DisplayImageOptions defaultOptions = new DisplayImageOptions.Builder() 
      .cacheInMemory(true) 
      .cacheOnDisc(true) 
      .build(); 

    ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(getApplicationContext()) 
      .defaultDisplayImageOptions(defaultOptions) 
      .build(); 
    ImageLoader.getInstance().init(config); 


    imageViewComic = (ImageView) findViewById(R.id.imageViewComic); 

    imageViewComic.setOnTouchListener(new OnSwipeTouchListener(this) { 
     @Override 
     public void onSwipeDown() { 
      Toast.makeText(MainActivity.this, "Down", Toast.LENGTH_SHORT).show(); 
     } 

     @Override 
     public void onSwipeLeft() { 
      Toast.makeText(MainActivity.this, "Left", Toast.LENGTH_SHORT).show(); 
     } 

     @Override 
     public void onSwipeUp() { 
      Toast.makeText(MainActivity.this, "Up", Toast.LENGTH_SHORT).show(); 
     } 

     @Override 
     public void onSwipeRight() { 
      Toast.makeText(MainActivity.this, "Right", Toast.LENGTH_SHORT).show(); 
     } 
    }); 

    mAttacher = new PhotoViewAttacher(imageViewComic); 


    // Button for loading latest comic 
    btnLatestComic = (Button) findViewById(R.id.btnLoadComic); 
    btnLatestComic.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      new JSONParse().execute("http://xkcd.com/info.0.json"); 
     } 
    }); 


    // Button for loading previous comic 
    btnPrevComic = (Button) findViewById(R.id.btnPrevComic); 
    btnPrevComic.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      getPrevComic(); 
     } 
    }); 


    // Button for loading next comic 
    btnNextComic = (Button) findViewById(R.id.btnNextComic); 
    btnNextComic.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      getNextComic(); 
     } 
    }); 





    SharedPreferences Sharedsettings; 
    SharedPreferences.Editor editor; 
    Sharedsettings = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()); 
    boolean load_latest = Sharedsettings.getBoolean("load_latest_startup", true); 

    if(load_latest == true) { 
     //Load latest comic 
     new JSONParse().execute("http://xkcd.com/info.0.json"); 
    } 
    else 
    { 
     getLastComic(); 
    } 


} 

Answer 1

使用這個類來創建一扔功能，會延長SimpleOnGestureListener，然後使用該一扔功能刷你的圖像。這裏我使用ViewPager。

---

class MyGestureDetector extends SimpleOnGestureListener { 
    @Override 
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { 
     try { 
      if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH) 
       return false; 
      // right to left swipe 
      if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY 
        && selectedPg == (pageCount - 1)) { 
       shop_view_pager.setCurrentItem(0); 
       return true; 
      } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY 
        && selectedPg == 0) { 
       shop_view_pager.setCurrentItem(pageCount - 1); 
       return true; 
      } 
     } catch (Exception e) { 
      // nothing 
     } 
     return false; 
    } 
} 

現在創建用於MyGestureDetector一個對象，並使用OnTouchListener設置手勢的funcionality。

final GestureDetector gestureDetector = new GestureDetector(new MyGestureDetector()); 
    view_pager.setOnTouchListener(new OnTouchListener() { 
     public boolean onTouch(View v, MotionEvent event) { 
      return gestureDetector.onTouchEvent(event); 
     } 
    }); 
    view_pager.setOnPageChangeListener(new OnPageChangeListener() { 

     public void onPageSelected(int position) { 
      selectedPg = position; 
     }