以自定義ImageView為例：

/**
 * 可拖拽ImageView
 * Created by admin on 2017/2/21.
 */
public class FloatingImageView extends ImageView{


    public FloatingImageView(Context context) {
        super(context);
    }

    public FloatingImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public FloatingImageView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP
 
)
    public FloatingImageView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    

    int startX;
    int startY;
    int left;
    int top;
    int[] temp = new int[]{ 0, 0 };
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        boolean isMove = false;
        int x = (int) event.getRawX();
        int y = (int) event.getRawY();
        switch (event.getAction()){
            case MotionEvent.ACTION_DOWN
 
: // touch down so check if the
                startX = x;
                startY = y;
                temp[0] = (int) event.getX();
                temp[1] = y - getTop();
                break;
            case MotionEvent.ACTION_MOVE: // touch drag with the ball
                left = x - temp[0];
                top = y - temp[1];
                if(left < 0){//控制左邊界不超出
                    left = 0;
                }
                layout(left, top, left + getWidth(),top + getHeight());//自由拖拽
                break;
            case MotionEvent.ACTION_UP
 
:
                if (Math.abs(x - startX) > 2 || Math.abs(y - startY) > 2){//判斷是否移動,再一定範圍內不算是移動，解決觸發事件沖突
                    //將最後拖拽的位置定下來，否則頁面刷新渲染後按鈕會自動回到初始位置
                    //註意父容器
                    RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) getLayoutParams();
                    lp.setMargins(left, top,0,0);
                    setLayoutParams(lp);
                    //確定是拖拽
                    isMove = true;
                 }
                break;
        }
        return isMove ? true : super.onTouchEvent(event);
     }
}

Android 自定義可拖拽View，界面渲染刷新後不會自動回到起始位置