弹出一个对话框并且对是和否绑定事件

//String  是用来显示提示内容
protected void dialog(String result) {
        AlertDialog.Builder builder = new Builder(MainActivity.this);
        builder.setMessage(result);
        builder.setTitle("提示");
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog,int which) {
                passwordTextId.setText("");
            }
        });
        builder.setNegativeButton("退出", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog,int which) {
                dialog.dismiss();
                MainActivity.this.finish();
            }
        });
        
        builder.create().show();
        
    }