android控件拖動，移動、解決父佈局重繪時控件回到原點

這是主要代碼: 保證其params發生改變，相對於父佈局的位置就能達到位置移動到原來的位置

// 每次移動都要設置其layout，不然由於父佈局可能嵌套listview，當父佈局發生改變沖毀（如下拉刷新時）則移動的view會回到原來的位置
RelativeLayout.LayoutParams lpFeedback = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
lpFeedback.leftMargin = v.getLeft();
lpFeedback.topMargin = v.getTop();
lpFeedback.setMargins(v.getLeft(), v.getTop(), 0, 0);
v.setLayoutParams(lpFeedback);

思路是：當view的位置發生改變時，也要相應改變其layoutparams，否則父佈局重繪時，由於view的layoutparams沒發生改變導致重繪的時候會回到原點，所以只要改變其params就好了

/**
	 * 
	 * @description 設置意見反饋，用以灰度發佈
	 * @author zhongwr
	 * @params
	 * @update 2016年1月12日 下午5:36:07
	 */
	private ImageView getFeedBackView() {
		ImageView ivFeedback = new ImageView(BaseActivity.this);
		ivFeedback.setImageResource(R.drawable.fuli_feedback);
		RelativeLayout.LayoutParams lpFeedback = new RelativeLayout.LayoutParams(
				RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
		lpFeedback.setMargins(0, 0, 20, 218);
		lpFeedback.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
		lpFeedback.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
		ivFeedback.setLayoutParams(lpFeedback);
		ivFeedback.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {// 意見反饋
				FeedBackActivity.startInstance(BaseActivity.this);
			}
		});
		return ivFeedback;
	}

	private boolean isIntercept = false;
	/** 按下時的位置控件相對屏幕左上角的位置X */
	private int startDownX;
	/** 按下時的位置控件距離屏幕左上角的位置Y */
	private int startDownY;
	/** 控件相對屏幕左上角移動的位置X */
	private int lastMoveX;
	/** 控件相對屏幕左上角移動的位置Y */
	private int lastMoveY;

	/**
	 * 
	 * @description 拖動意見反饋位置
	 * @author zhongwr
	 * @params
	 * @update 2016年1月14日 下午5:08:26
	 */
	private void setFeedBackViewDragTouch(ImageView ivFeedBack) {

		ivFeedBack.setOnTouchListener(new OnTouchListener() {

			@Override
			public boolean onTouch(View v, MotionEvent event) {
				int action = event.getAction();
				switch (action) {
				case MotionEvent.ACTION_DOWN:
					startDownX = lastMoveX = (int) event.getRawX();
					startDownY = lastMoveY = (int) event.getRawY();
					break;
				case MotionEvent.ACTION_MOVE:
					int dx = (int) event.getRawX() - lastMoveX;
					int dy = (int) event.getRawY() - lastMoveY;

					int left = v.getLeft() + dx;
					int top = v.getTop() + dy;
					int right = v.getRight() + dx;
					int bottom = v.getBottom() + dy;
					if (left < 0) {
						left = 0;
						right = left + v.getWidth();
					}
					if (right > mScreenWidth) {
						right = mScreenWidth;
						left = right - v.getWidth();
					}
					if (top < 0) {
						top = 0;
						bottom = top + v.getHeight();
					}
					if (bottom > mScreenHeight) {
						bottom = mScreenHeight;
						top = bottom - v.getHeight();
					}
					v.layout(left, top, right, bottom);
					lastMoveX = (int) event.getRawX();
					lastMoveY = (int) event.getRawY();
					break;
				case MotionEvent.ACTION_UP:
					int lastMoveDx = Math.abs((int) event.getRawX() - startDownX);
					int lastMoveDy = Math.abs((int) event.getRawY() - startDownY);
					if (0 != lastMoveDx || 0 != lastMoveDy) {
						isIntercept = true;
					} else {
						isIntercept = false;
					}
					// 每次移動都要設置其layout，不然由於父佈局可能嵌套listview，當父佈局發生改變沖毀（如下拉刷新時）則移動的view會回到原來的位置
					RelativeLayout.LayoutParams lpFeedback = new RelativeLayout.LayoutParams(
							RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
					lpFeedback.leftMargin = v.getLeft();
					lpFeedback.topMargin = v.getTop();
					lpFeedback.setMargins(v.getLeft(), v.getTop(), 0, 0);
					v.setLayoutParams(lpFeedback);
					break;
				}
				return isIntercept;
			}
		});
	}

demo：demo