A991192001的专栏

Type Size 数值范围 无值型void 0 byte 无值域 布尔型bool 1 byte true   false 有符号短整型short [int] /signed short [int] 2 byte -32768~32767 无符号短

1.set listener myDragEventListener mDragListener = new myDragEventListener(); imageView.setOnDragListener(mDragListener); targetView.setOnDragListener(mDragListener); imageView.setOnLongCl

1.创建AlertDialog public void showDeleteDialog() { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage("Are you sure want to delete?") .setCancelable(false)///back按键