ANR 事件后重启应用程序的问题

Question

我已经使用此 GitHub 存储库在我的应用程序中实现了 ANR 看门狗。看门狗监视 UI 线程，如果它被阻塞超过 10 秒，则重新启动应用程序。我的问题是它重新启动了应用程序两次，因此打乱了我所有的逻辑。

这是我对 WatchDog 的实现：

public class ANRWatchdog extends Thread {

private final Handler uiHandler = new Handler(Looper.getMainLooper());
private int count = 0; //
private static final int DEFAULT_WAIT_TIME = 10000; // in milliseconds
private volatile boolean anr = false;
private Context context;

public ANRWatchdog(Context context) {
    super();
    this.context = context;
}

private final Runnable counter = () -> count = (count + 1) % Integer.MAX_VALUE;

@Override
public void run() {
    setName("WatchDog");
    int lastCount;
    while (!isInterrupted()) {
        if ( anr){
            anr = false;
            return;
        }
        lastCount = count;
        uiHandler.post(counter);
        try {
            Thread.sleep(DEFAULT_WAIT_TIME);
        } catch (InterruptedException e) {
            Log.e("WatchDog",
                    "Error while making the ANR thread sleep" + e);
            return;
        }
        if (count == lastCount) {// means the value hasn't been incremented. UI thread has been blocked
            anr = true;
            Log.d("WatchDog", "Count hasn't incremented. This means ANR. Will restart the app. Thread Id : " +
                    android.os.Process.getThreadPriority(android.os.Process.myTid()));
            uiHandler.removeCallbacks(counter, null);
            uiHandler.removeCallbacksAndMessages(null);
            ANRSharedPrefs.storeANR(context, true, SystemClock.elapsedRealtime());
            ANRError error = ANRError.NewMainOnly();
            Log.e("WatchDog", "" + error);
            Log.d("WatchDog", "Now restarting the app");
            RestartAppUtil.restartApp(context);
            return;
        }
    }
}
}

看门狗是这样启动的

public class FileLogger extends Application {


ANRWatchDog watchDog = new ANRWatchDog(this);

/**
 * Called when the application is starting, before any activity, service, or receiver objects (excluding content providers) have been created.
 */
@Override
public void onCreate() {
    super.onCreate();
    Log.i(TAG, "Now launching Android Application : " + BuildConfig.VERSION_NAME);
    File logFile = new File(ExternalStoragePath.getExternalCardPath(getApplicationContext()), "log.txt");
    try {
        String cmd = "logcat -v time -f " + logFile.getPath() + " TAG1:I TAG2:D TAG3:E *:S";
        Runtime.getRuntime().exec(cmd);
    } catch (IOException e) {
        Log.e(TAG, "Exception during writing to log " + e);
    }
    watchDog.start();
}

}

这是我重新启动应用程序的方式，即 RestartUtil

public static void restartApp(Context context){
    context.stopService(new Intent(context, Service.class));
    Intent mStartActivity = new Intent(context, MainActivity.class);
    mStartActivity.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
    mStartActivity.putExtra(KeyConstants.ANR, true);
    int mPendingIntentId = 123456;
    PendingIntent mPendingIntent = PendingIntent.getActivity(context, mPendingIntentId,    mStartActivity, PendingIntent.FLAG_CANCEL_CURRENT);
    AlarmManager mgr = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
    mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 100, mPendingIntent);
    Runtime.getRuntime().exit(0);
}

此代码有效，应用程序已重新启动。

我正在使用无限 while 循环模拟其中一项活动中的 ANR。当我这样做时，这就是日志中发生的事情

10-17 13:30:08.221 19588-19608/com.company.project D/TAG1 Count hasn't incremented. This means ANR. Will restart the app. Thread Id : 0
10-17 13:30:08.221 19588-19608/com.company.project D/TAG1 Storing the ANR time : 617417608
10-17 13:30:08.231 19588-19608/com.company.project D/TAG1 Now restarting the app
10-17 13:30:18.411 20333-20353/com.company.project D/TAG1 Count hasn't incremented. This means ANR. Will restart the app. Thread Id : 0
10-17 13:30:18.411 20333-20353/com.company.project D/TAG1 Storing the ANR time : 617427797
10-17 13:30:18.421 20333-20353/com.company.project D/TAG1 Now restarting the app
10-17 13:30:18.791 20362-20362/? D/TAG1: Getting the value of ANR time 617427797
10-17 13:30:18.791 20362-20362/? D/TAG1: Received intent in main screen
10-17 13:30:20.171 20362-20362/com.company.project D/TAG1 Getting the value of ANR time
10-17 13:30:20.171 20362-20362/com.company.project D/TAG1 Received intent in main screen 617427797

主要 activity 收到两个意图，而不是一个。我也不明白

的存在

/? D/TAG1

在日志中

谁能帮我弄清楚为什么主屏幕有两个意图？

Answer 1

所以我终于能够解决这个问题。

System.exit() 对我来说还不够。我不得不在导致 ANR 的 activity 上调用 finish() 或 finishAffinity()。

所以在

onCreate()

每个活动的方法，我像这样在 FileLogger 中注册 activity 的实例

FileLogger.setActivityName(this);

这是 FileLogger 的修改方式

/**to register the activity)
public static void setActivityName(Activity activityName){
    anrActivity = activityName;
}

/**This method is called by RestartUtil method to restart the app**/
public static void kill(){
    if ( anrActivity != null) {
        anrActivity.finish();
        anrActivity.finishAffinity();
    }
    android.os.Process.killProcess(android.os.Process.myPid());
}

ANR 事件后重启应用程序的问题

Problem with restarting the app, after an ANR event

java

multithreading

android

watchdog

android-anr-dialog