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//控件所在布局为相对布局,所以显示样式由relativelayout来决定
LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
//locationX, locationY分别代表控件距离父控件的左边距和上边距
params.leftMargin = locationX;
params.topMargin = locationY;
iv_incoming_toast_drag.setLayoutParams(params);
iv_incoming_toast_drag.layout(locationX, locationY, locationX + iv_incoming_toast_drag.getWidth(), locationY+ iv_incoming_toast_drag.getHeight());