Android Dialog弹框提示

public void showUpdateDialog(String content) {
    //普通的AlertDialog对话框
    AlertDialog.Builder builder = new AlertDialog.Builder(LoadingActivity.this);
    builder.setTitle("版本更新");
    builder.setMessage(content);
    builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            MyApp.getApp().showToast("取消");
        }
    });
    builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            MyApp.getApp().showToast("确定");
        }
    });
    AlertDialog dialog = builder.create();
    dialog.show();
}