A991192001的专栏

TypeSize数值范围无值型void0 byte无值域布尔型bool1 bytetrue   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