android提示框

AlertDialog dialog = new AlertDialog.Builder(this).create();//创建对话框
        dialog.setIcon(R.mipmap.ic_launcher);//设置对话框icon
        dialog.setTitle("这是一个AlertDialog");//设置对话框标题
        dialog.setMessage("Hello world");//设置文字显示内容
        //分别设置三个button
        dialog.setButton(DialogInterface.BUTTON_POSITIVE,"确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();//关闭对话框
            }
        });
        dialog.setButton(DialogInterface.BUTTON_NEUTRAL,"点我试试", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) { }
        });
        dialog.setButton(DialogInterface.BUTTON_NEGATIVE, "取消", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();//关闭对话框
            }
        });
        dialog.show();//显示对话框