如何按下并拖动并将 imageView 留在我未按下手指的位置？[android]

Question

ImageView currentImage = (ImageView) findViewById(R.id.image) ;  
onTouch(View v, MotionEvent event){
 if(event.getAction() == MotionEvent.ACTION_DOWN){
    float x = event.getX() ;
    float y = event.getY();
    currentImage.setX(x) ;
    currentImage.setY(y) ;
    //the 2 lines above must be dragging the image across the screen
 }


 if( event.getAction() == MotionEvent.ACTION_UP){
     currentImage.setX(x) ;
     currentImage.setY(y) ;
 }

}

但是，代码不起作用，这是我能想到的最接近的。

Answer 1

对于 Honeycomb（API 级别 11）以下的任何内容，您必须使用 setLayoutParams():-

如果superLayout是RelativeLayout-

 RelativeLayout.LayoutParams layoutParams=new RelativeLayout.LayoutParams(int width, int height);
    layoutParams.setMargins(int left, int top, int right, int bottom);
    imageView.setLayoutParams(layoutParams);

如果superLayout是Linearlayout-

 Linearlayout.LayoutParams layoutParams=new Linearlayout.LayoutParams(int width, int height);
    layoutParams.setMargins(int left, int top, int right, int bottom);
    imageView.setLayoutParams(layoutParams);

如果您限制对 Honeycomb 及更高版本的支持，您可以使用 setX(), setY(), setLeft(), setTop()