android控件拖动，移动、解决父布局重绘时控件回到原点

这是主要代码: 保证其params发生改变，相对于父布局的位置就能达到位置移动到原来的位置

// 每次移动都要设置其layout，不然由于父布局可能嵌套listview，当父布局发生改变冲毁（如下拉刷新时）则移动的view会回到原来的位置
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：当view的位置发生改变时，也要相应改变其layoutparams，否则父布局重绘时，由于view的layoutparams没发生改变导致重绘的时候会回到原点，所以只要改变其params就好了

/** *  * @description 设置意见反馈，用以灰度发布 * @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() {@Overridepublic void onClick(View v) {// 意见反馈FeedBackActivity.startInstance(BaseActivity.this);}});return ivFeedback;}private boolean isIntercept = false;/** 按下时的位置控件相对屏幕左上角的位置X */private int startDownX;/** 按下时的位置控件距离屏幕左上角的位置Y */private int startDownY;/** 控件相对屏幕左上角移动的位置X */private int lastMoveX;/** 控件相对屏幕左上角移动的位置Y */private int lastMoveY;/** *  * @description 拖动意见反馈位置 * @author zhongwr * @params * @update 2016年1月14日 下午5:08:26 */private void setFeedBackViewDragTouch(ImageView ivFeedBack) {ivFeedBack.setOnTouchListener(new OnTouchListener() {@Overridepublic 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;}// 每次移动都要设置其layout，不然由于父布局可能嵌套listview，当父布局发生改变冲毁（如下拉刷新时）则移动的view会回到原来的位置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