Android 看门狗代码

以下是一个简单的 Android 看门狗代码示例：

public class WatchdogService extends Service {
    private static final String TAG = "WatchdogService";
    private static final long TIMEOUT = 30000; // 30 seconds
    private Handler mHandler;
    private Runnable mRunnable;
    private boolean mIsRunning;

    @Override
    public void onCreate() {
        super.onCreate();
        mHandler = new Handler();
        mRunnable = new Runnable() {
            @Override
            public void run() {
                Log.e(TAG, "Process has stopped responding!");
                // TODO: perform necessary actions, such as restarting the app or notifying the user
            }
        };
        mIsRunning = true;
        startWatchdog();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        stopWatchdog();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO: perform necessary actions, such as initializing variables or starting a background thread
        return START_STICKY;
    }

    private void startWatchdog() {
        mHandler.postDelayed(mRunnable, TIMEOUT);
    }

    private void stopWatchdog() {
        mHandler.removeCallbacks(mRunnable);
        mIsRunning = false;
    }
}

在此示例中，我们使用了一个 `Handler` 和一个 `Runnable`，每隔 30 秒检查一次进程是否仍然在运行。如果进程停止响应，我们可以根据需要执行必要的操作，例如重新启动应用程序或通知用户。请注意，在此示例中，我们将看门狗服务设置为 `START_STICKY`，这将使系统在内存不足时尝试重新启动该服务。