Android TextView Timer

public class MainActivity extends AppCompatActivity {
    private TextView mTextView;
    private Handler mHandler;
    private Runnable mRunnable;
    private int mCounter = 10;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTextView = findViewById(R.id.textView);

        mHandler = new Handler();
        mRunnable = new Runnable() {
            @Override
            public void run() {
                mCounter--;
                mTextView.setText(String.valueOf(mCounter));
                if (mCounter > 0) {
                    mHandler.postDelayed(this, 1000);
                }
            }
        };
        mHandler.post(mRunnable);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mHandler.removeCallbacks(mRunnable);
    }
}