如何让AlertDialog在泛型类而不是Activity中工作

public class MyGenericClass<T extends Activity> {
    private T mActivity;

    public MyGenericClass(T activity) {
        mActivity = activity;
    }

    public void showDialog() {
        mActivity.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                AlertDialog.Builder builder = new AlertDialog.Builder(mActivity);
                builder.setTitle("Dialog Title")
                        .setMessage("Dialog Message")
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                // 点击确定按钮的逻辑处理
                            }
                        })
                        .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                // 点击取消按钮的逻辑处理
                            }
                        })
                        .show();
            }
        });
    }
}