在视图/活动/片段可见后，每5分钟显示一次警告对话框的最佳方法是什么？

import android.os.Handler;
import android.os.Looper;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    private Handler handler;
    private Runnable runnable;

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

        handler = new Handler(Looper.getMainLooper());
        runnable = new Runnable() {
            @Override
            public void run() {
                // 显示警告对话框
                showAlertDialog();
                // 5分钟后再次执行
                handler.postDelayed(this, 5 * 60 * 1000);
            }
        };
    }

    @Override
    protected void onResume() {
        super.onResume();
        // 启动定时器
        handler.postDelayed(runnable, 5 * 60 * 1000);
    }

    @Override
    protected void onPause() {
        super.onPause();
        // 停止定时器
        handler.removeCallbacks(runnable);
    }

    private void showAlertDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("警告");
        builder.setMessage("这是一个警告对话框");
        builder.setPositiveButton("确定", null);
        builder.show();
    }
}