Android移动ImageView

我在网上搜索了一个简单的解决方案，以自由移动ImageView。我终于找到了一些代码，产生完美的结果：Android移动ImageView

public class MainActivity extends Activity implements View.OnTouchListener { 

    private int _xDelta; 
    private int _yDelta; 

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

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

     j.setOnTouchListener(this); 

    } 

    public boolean onTouch(View view, MotionEvent event) { 
     final int X = (int) event.getRawX(); 
     final int Y = (int) event.getRawY(); 
     ImageView j = (ImageView)findViewById(R.id.j); 
     switch (event.getAction() & MotionEvent.ACTION_MASK) { 
      case MotionEvent.ACTION_DOWN: 
       RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) view.getLayoutParams(); 
       _xDelta = (int) (X - j.getTranslationX()); 
       _yDelta = (int) (Y - j.getTranslationY()); 
       break; 
      case MotionEvent.ACTION_UP: 
       break; 
      case MotionEvent.ACTION_POINTER_DOWN: 
       break; 
      case MotionEvent.ACTION_POINTER_UP: 
       break; 
      case MotionEvent.ACTION_MOVE: 
       RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) view.getLayoutParams(); 

       j.setTranslationX(X - _xDelta); 
       j.setTranslationY(Y - _yDelta); 
       break; 
     } 

     return true; 
    }}

因为我真的不知道我的代码是如何工作的，我想看看是否有更好的解决方案。

来源

2013-12-20 ueen

这是我得到了解决：

private float xCoOrdinate, yCoOrdinate; 

     view.setOnTouchListener(new View.OnTouchListener() { 

      Float y1 = 0f, y2 = 0f; 

      @Override 
      public boolean onTouch(View v, MotionEvent event) { 

       Point size = new Point(); 
      getWindowManager().getDefaultDisplay().getSize(size);   

       switch (event.getAction()) { 
        case MotionEvent.ACTION_DOWN: 
         //xCoOrdinate = view.getX() - event.getRawX(); 
         yCoOrdinate = view.getY() - event.getRawY(); 
         Float puffer = 0f; 
         y1 = event.getRawY(); 

         break; 
        case MotionEvent.ACTION_MOVE: 
         view.animate().y(event.getRawY() + yCoOrdinate).setDuration(0).start(); 
         //view.animate().x(event.getRawX() + xCoOrdinate).y(event.getRawY() + yCoOrdinate).setDuration(0).start(); 
         break; 
        case MotionEvent.ACTION_UP: 
         y2 = event.getRawY(); 
         Float dy = (y2 - y1); 


         if (dy < 0) { 
          //moved up 
          view.animate().y(size.y/100 * -40).setDuration(100).start(); 
         } else if (dy > 0) { 
          // moved down 
          view.animate().y(size.y/2 - view.getHeight()/2).setDuration(100).start(); 
         } 

         break; 
       } 

       return false; 
      } 
     });

说明：如果向上或向下移动，我只需要在y轴和dectection运动。它通过将视图动画化为触觉而减弱，女巫具有优点和缺点（相反：它很复杂地检测视角在空间/专业中的位置：视图实际上移动并且看起来似乎不在其他地方），但最终效果最好我很简单。这里的目标是向上滑动视图并将其滑动到所需位置，与向下滑动相同，回到原始位置，这是相对于屏幕尺寸实现的。对我来说，代码是相对简单和自我牺牲的，但请询问是否有任何不清楚的地方。

来源

2016-05-16 13:04:54 ueen

如Google所示，如果您的目标Android版本3.0及以上，您可以使用DragListener。

对于您可以使用类似蜂巢之前的版本：

// The ‘active pointer’ is the one currently moving our object. 
private int mActivePointerId = INVALID_POINTER_ID; 

@Override 
public boolean onTouchEvent(MotionEvent ev) { 
    // Let the ScaleGestureDetector inspect all events. 
    mScaleDetector.onTouchEvent(ev); 

    final int action = MotionEventCompat.getActionMasked(ev); 

    switch (action) { 
    case MotionEvent.ACTION_DOWN: { 
     final int pointerIndex = MotionEventCompat.getActionIndex(ev); 
     final float x = MotionEventCompat.getX(ev, pointerIndex); 
     final float y = MotionEventCompat.getY(ev, pointerIndex); 

     // Remember where we started (for dragging) 
     mLastTouchX = x; 
     mLastTouchY = y; 
     // Save the ID of this pointer (for dragging) 
     mActivePointerId = MotionEventCompat.getPointerId(ev, 0); 
     break; 
    } 

    case MotionEvent.ACTION_MOVE: { 
     // Find the index of the active pointer and fetch its position 
     final int pointerIndex = 
       MotionEventCompat.findPointerIndex(ev, mActivePointerId); 

     final float x = MotionEventCompat.getX(ev, pointerIndex); 
     final float y = MotionEventCompat.getY(ev, pointerIndex); 

     // Calculate the distance moved 
     final float dx = x - mLastTouchX; 
     final float dy = y - mLastTouchY; 

     mPosX += dx; 
     mPosY += dy; 

     invalidate(); 

     // Remember this touch position for the next move event 
     mLastTouchX = x; 
     mLastTouchY = y; 

     break; 
    } 

    case MotionEvent.ACTION_UP: { 
     mActivePointerId = INVALID_POINTER_ID; 
     break; 
    } 

    case MotionEvent.ACTION_CANCEL: { 
     mActivePointerId = INVALID_POINTER_ID; 
     break; 
    } 

    case MotionEvent.ACTION_POINTER_UP: { 

     final int pointerIndex = MotionEventCompat.getActionIndex(ev); 
     final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex); 

     if (pointerId == mActivePointerId) { 
      // This was our active pointer going up. Choose a new 
      // active pointer and adjust accordingly. 
      final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 
      mLastTouchX = MotionEventCompat.getX(ev, newPointerIndex); 
      mLastTouchY = MotionEventCompat.getY(ev, newPointerIndex); 
      mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex); 
     } 
     break; 
    } 
    }  
    return true; 
}

如再次通过谷歌here建议。

来源

2013-12-20 15:09:29

由于您已使用来自API级别11的setTranslationX（），因此最好使用DragListener。 http://developer.android.com/guide/topics/ui/drag-drop.html

来源

2014-04-10 17:29:54

即工作液

public boolean onTouch(View view, MotionEvent event) { 
final int X = (int) event.getRawX(); 
final int Y = (int) event.getRawY(); 
switch (event.getAction() & MotionEvent.ACTION_MASK) { 
case MotionEvent.ACTION_DOWN: 
    RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) view 
      .getLayoutParams(); 

    _xDelta = X - lParams.leftMargin; 
    _yDelta = Y - lParams.topMargin; 
    break; 
case MotionEvent.ACTION_UP: 
    break; 
case MotionEvent.ACTION_POINTER_DOWN: 
    break; 
case MotionEvent.ACTION_POINTER_UP: 
    break; 
case MotionEvent.ACTION_MOVE: 
    RelativeLayout.LayoutParams ParamsA = (RelativeLayout.LayoutParams) view 
      .getLayoutParams(); 
    ParamsA.leftMargin = X - _xDelta; 
    ParamsA.topMargin = Y - _yDelta; 
    ParamsA.rightMargin = -250; 
    ParamsA.bottomMargin = -250; 

    for (int i = 0; i < balls.size(); i++) { 
     if (balls.get(i).getTag() != view.getTag()) { 
      RelativeLayout.LayoutParams ParamsB = (RelativeLayout.LayoutParams) balls 
        .get(i).getLayoutParams(); 

      Rect b = new Rect(ParamsB.leftMargin,ParamsB.topMargin,ParamsB.rightMargin,ParamsB.bottomMargin); 
      Rect a = new Rect(ParamsA.leftMargin,ParamsA.topMargin,ParamsA.rightMargin,ParamsA.bottomMargin); 


      if(a.intersect(b)) 
      { 
       Toast.makeText(getApplicationContext(), "Collision Detected", Toast.LENGTH_SHORT).show(); 
      } 
     } 

    } 

    view.setLayoutParams(ParamsA); 
    break; 
} 
// _root.invalidate(); 
return true; 
}

欢呼。

来源

2014-09-25 17:01:17 Ali

Android移动ImageView

回答

相关问题