java - SharedPreferences 在使用前不断被删除

Question

这是一件好事。我将 int 值存储在我的共享首选项中，本质上是缓存它们，以便我可以在下次启动时将它们放入数据库中。我有一种方法可以在启动时将它们保存到数据库中。

接下来是从共享首选项中删除值以重置它们的方法。

但在我将它们存储到数据库之前，它们似乎一直在删除。就像无论我做什么，deleteMetrics(); 都会在 setMetrics(); 之前运行。

• 我尝试将共享首选项值的删除放在自己的中 启动 Activity 中的方法。
• 我尝试过删除 启动时 setMetrics 方法中的共享首选项值 Activity 。
• 我尝试删除共享首选项值 在启动 Activity 的 onCreate 的不同位置。
• 我尝试将共享首选项值的删除放入 startupUpdateMetrics() 内部和外部的 Metrics 类 方法。
• 我尝试将共享首选项值的删除放入 runOnUiThread 以防我有泄漏线程(见下文)。
• 我已在 onCreate 中尝试使用 Thread.sleep(5000) 来启动 settMetrics(); 和 deleteMetrics(); 之间的 Activity

没有任何效果。在 setMetrics(); 方法将值存储到数据库之前，这些值将被删除。

如果我注释掉deleteMetrics();，数据库值可以很好地存储，但它们会呈指数级增长，因为不会为每个应用程序使用重置sharedPrefs。

在创建时启动 Activity :

Activity_Splash.this.runOnUiThread(new Runnable() {
    @Override
    public void run() {
        setMetrics();
        deleteMetrics();
    }
});

setMetrics();和deleteMetrics();

private void setMetrics() {
    SharedPreferences sharedPreferences = Activity_Splash.this.getSharedPreferences("com.dmurphy.remotescrumpoker", Context.MODE_PRIVATE);
    //Check if device has a network connection
    boolean connectionExists = new NetworkConnection().haveNetworkConnection(passedActivity, TAG);

    //If device has a network connection continue
    if (connectionExists) {
        Log.i(" => ", "Test1");
        try {
            String userId = mAuth.getCurrentUser().getUid();
            int teamCreated2 = sharedPreferences.getInt("teamCreatedForMetrics", 0);
            Log.i(" => ", "Test2 " + teamCreated2);
            callMetrics.startupUpdateMetrics(userId, context);
        } catch (Exception e) {
            Log.e(TAG + "onCreate", "Error setting metrics");
        }
    }
}

private void deleteMetrics() {
    SharedPreferences sharedPreferences = Activity_Splash.this.getSharedPreferences("com.dmurphy.remotescrumpoker", Context.MODE_PRIVATE);
        try {
            sharedPreferences.edit().remove("acceptedForMetrics").commit();
            sharedPreferences.edit().remove("rejectedForMetrics").commit();
            sharedPreferences.edit().remove("requestedForMetrics").commit();
            sharedPreferences.edit().remove("sm2AppointedForMetrics").commit();
            sharedPreferences.edit().remove("teamCreatedForMetrics").commit();
            sharedPreferences.edit().remove("teamDeletedForMetrics").commit();
            sharedPreferences.edit().remove("noOfPlayersForMetrics").commit();
            sharedPreferences.edit().remove("teamsMemberLeaveForMetrics").commit();
        } catch (Exception e) {
            Log.e(TAG + "onCreate", "Error setting metrics");
        }
    }

callMetrics 被 setMetrics 方法调用:

public void startupUpdateMetrics(String userId, Context context) {
    SharedPreferences sharedPreferences = context.getSharedPreferences("com.dmurphy.remotescrumpoker", Context.MODE_PRIVATE);

    db.collection("userteammetrics").document(userId).collection("teammetrics").document("generalteammetrics").get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
        @Override
        public void onComplete(@NonNull Task<DocumentSnapshot> task) {
            if (task.isSuccessful()) {
                int teamCreated4 = sharedPreferences.getInt("teamCreatedForMetrics",0);
                Log.i(" => ", "Test4 " + teamCreated4);
                DocumentSnapshot document = task.getResult();

                if (document.exists()) {
                    int teamCreated5 = sharedPreferences.getInt("teamCreatedForMetrics",0);
                    Log.i(" => ", "Test5 " + teamCreated5);
                    int oldAccepted = Integer.parseInt(document.get("accepted").toString());
                    int oldRejected = Integer.parseInt(document.get("rejected").toString());
                    int oldRequested = Integer.parseInt(document.get("requested").toString());
                    int oldsm2Appointed = Integer.parseInt(document.get("scrummaster2sappointed").toString());
                    int oldTeamsCreated = Integer.parseInt(document.get("teamscreated").toString());
                    int oldTeamsDeleted = Integer.parseInt(document.get("teamsdeleted").toString());
                    int oldTeamsMemberLeave = Integer.parseInt(document.get("memberLeave").toString());

                    int addAccepted = sharedPreferences.getInt("acceptedForMetrics",0);
                    int addRejected = sharedPreferences.getInt("rejectedForMetrics",0);
                    int addRequested = sharedPreferences.getInt("requestedForMetrics",0);
                    int addsm2Appointed = sharedPreferences.getInt("sm2AppointedForMetrics",0);
                    int addTeamsCreated = sharedPreferences.getInt("teamCreatedForMetrics",0);
                    int addTeamsDeleted = sharedPreferences.getInt("teamDeletedForMetrics",0);
                    int playersPerGame = sharedPreferences.getInt("noOfPlayersForMetrics",0);
                    int addTeamsMemberLeave = sharedPreferences.getInt("teamsMemberLeaveForMetrics",0);
                    Log.i("Test6 ", "startupUpdateMetrics: " + addAccepted + " " + addRejected + " " + addRequested + " " + addsm2Appointed + " " + addTeamsCreated + " " + addTeamsDeleted + " " + playersPerGame + " " + addTeamsMemberLeave);

                    int newAccepted = oldAccepted + addAccepted;
                    int newRejected = oldRejected + addRejected;
                    int newRequested = oldRequested + addRequested;
                    int newsm2Appointed = oldsm2Appointed + addsm2Appointed;
                    int newTeamsCreated = oldTeamsCreated + addTeamsCreated;
                    int newTeamsDeleted = oldTeamsDeleted + addTeamsDeleted;
                    int newTeamsMemberLeave = oldTeamsMemberLeave + addTeamsMemberLeave;
                    Log.i("Test7  ", "startupUpdateMetrics: " + newAccepted + " " + newRejected + " " + newRequested + " " + newsm2Appointed + " " + newTeamsCreated + " " + newTeamsDeleted + " " + newTeamsMemberLeave);

                    db.collection("userteammetrics").document(userId).collection("teammetrics").document("generalteammetrics").update("accepted", newAccepted, "rejected", newRejected, "requested", newRequested, "scrummaster2sappointed", newsm2Appointed, "teamscreated", newTeamsCreated, "teamsdeleted", newTeamsDeleted, "memberLeave", newTeamsMemberLeave, "numberofplayerspergame" ,FieldValue.arrayUnion(playersPerGame));

                }
            }
        }
    });
}

LogCat(我不知道为什么它全部出现两次......因此我认为可能存在泄漏线程):

2020-02-01 23:19:28.954 21586-21586/? I/Ads: Use RequestConfiguration.Builder().setTestDeviceIds(Arrays.asList("xxxxxxxxxxxxx") to get test ads on this device.
2020-02-01 23:19:29.026 21586-21586/? I/Ads: Use RequestConfiguration.Builder().setTestDeviceIds(Arrays.asList("xxxxxxxxxxxxx") to get test ads on this device.
2020-02-01 23:19:29.078 21586-21586/? I/ =>: Test1
2020-02-01 23:19:29.078 21586-21586/? I/ =>: Test2 0
2020-02-01 23:19:29.085 21586-21586/? I/ =>: Test1
2020-02-01 23:19:29.085 21586-21586/? I/ =>: Test2 0
2020-02-01 23:19:29.207 21586-21586/? I/Ads: Use RequestConfiguration.Builder().setTestDeviceIds(Arrays.asList("xxxxxxxxxxxxx") to get test ads on this device.
2020-02-01 23:19:29.219 21586-21586/? I/Ads: Use RequestConfiguration.Builder().setTestDeviceIds(Arrays.asList("xxxxxxxxxxxxx") to get test ads on this device.
2020-02-01 23:19:29.344 21586-21586/? I/ =>: Test4 0
2020-02-01 23:19:29.344 21586-21586/? I/ =>: Test5 0
2020-02-01 23:19:29.345 21586-21586/? I/Test6: startupUpdateMetrics: 0 0 0 0 0 0 0 0
2020-02-01 23:19:29.345 21586-21586/? I/Test7: startupUpdateMetrics: 0 0 0 0 0 0 0
2020-02-01 23:19:29.345 21586-21586/? I/ =>: Test4 0
2020-02-01 23:19:29.346 21586-21586/? I/ =>: Test5 0
2020-02-01 23:19:29.346 21586-21586/? I/Test6: startupUpdateMetrics: 0 0 0 0 0 0 0 0
2020-02-01 23:19:29.346 21586-21586/? I/Test7: startupUpdateMetrics: 0 0 0 0 0 0 0
2020-02-01 23:21:04.323 21908-21927/? I/PrimesTesting: GserviceFlagsSupplier.get()
2020-02-01 23:22:40.049 22041-22041/? D/OmtpVvmCarrierCfgHlpr: overrideConfigForTest is null

我对此感到茫然，任何建议将不胜感激。

Answer 1

您可以尝试设置一个计时器来连续检查 setMetrics() 是否已完成执行其所有代码，以便之后启动 deleteMetrics() 方法。

private static boolean done = false;

Activity_Splash.this.runOnUiThread(new Runnable() {
    @Override
    public void run() {
        setMetrics();
        final Timer t=new Timer();
        t.schedule(new TimerTask() {
        @Override
        public void run() {
        if(done){
        deleteMetrics();
        t.cancel();
        t.purge();
        }
        }
     }, 1000);

    }
});

在 setMetrics() 末尾将 done 的 boolean 值分配给 true。

 private void setMetrics() {
        SharedPreferences sharedPreferences = Activity_Splash.this.getSharedPreferences("com.dmurphy.remotescrumpoker", Context.MODE_PRIVATE);
        //Check if device has a network connection
        boolean connectionExists = new NetworkConnection().haveNetworkConnection(passedActivity, TAG);

        //If device has a network connection continue
        if (connectionExists) {
            Log.i(" => ", "Test1");
            try {
                String userId = mAuth.getCurrentUser().getUid();
                int teamCreated2 = sharedPreferences.getInt("teamCreatedForMetrics", 0);
                Log.i(" => ", "Test2 " + teamCreated2);
                callMetrics.startupUpdateMetrics(userId, context);
                done=true;
            } catch (Exception e) {
                Log.e(TAG + "onCreate", "Error setting metrics");
            }
        }
    }