应用程序在关闭时收到的gcm消息崩溃

当我的应用程序关闭时(即用户从应用程序切换菜单中刷掉),它会在 onMessageReceived() 中崩溃 .

这是 onMessageReceived()

@Override
public void onMessageReceived(String from, Bundle data) {
    String message = data.getString("message");
    from = data.getString("sender");

    File notificationsFile = Constants.getNotificationsFlagFile();
    ...
}

它在最后一行崩溃,给出 null pointer exception

08-13 21:15:25.535 23201-23216 / com.example.myapp E / AndroidRuntime:FATAL EXCEPTION:com.example.myapp.chatGCM.MyGcmListenerService.onMessageReceived(MyGcmListenerService.java)中的AsyncTask#1 java.lang.ExceptionInInitializerError: 52)位于com.google.android.gms.gcm.gms.gcm.gcm.GcmListenerService的com.google.android.gms.gcm.GcmListenerService.zzk(未知来源)的com.google.android.gms.gcm.GcmListenerService.zzs(未知来源) .zza(未知来源)位于java.util.concurrent.ThreadPoolExecutor的java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)中的com.google.android.gms.gcm.GcmListenerService $ 1.run(未知来源) java.lang.Thread.run中的$ Worker.run(ThreadPoolExecutor.java:573)(Thread.java:841)引起:com.example处的helpers.Constants . (Constants.java:54)处的java.lang.NullPointerException .myapp.chatGCM.MyGcmListenerService.onMessageReceived(MyGcmListenerService.java:52)位于com.google.android.gms.gc的com.google.android.gms.gcm.GcmListenerService.zzs(未知来源) m.GcmListenerService.zzk(未知来源)位于com.google.android.gms.gcm.GcmListenerService.zza(未知来源),位于com.google.android.gms.gcm.GcmListenerService $ 1.run(未知来源),位于java.util .concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)at java.util.concurrent.ThreadPoolExecutor $ Worker.run(ThreadPoolExecutor.java:573)at java.lang.Thread.run(Thread.java:841)

这里是 getNotificationsFlagFile()

public static File getNotificationsFlagFile()
{
    return new File(MainApplication.getAppContext().getFilesDir(), "notifications_"+getSession());
}

最后:

private static String getSession()
{
    File file = new File(MainApplication.getAppContext().getFilesDir(), "session");
    int length = (int) file.length();
    byte[] bytes = new byte[length];
    FileInputStream in = null;
    try {
        in = new FileInputStream(file);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
    try {
        try {
            in.read(bytes);
        } catch (IOException e) {
            e.printStackTrace();
        }
    } finally {
        try {
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return (new String(bytes));
}

我所使用的只是静态变量和函数 . 为什么会这样?

回答(1)

2 years ago

From here你似乎有一种不期望的行为......可能来自 getAppContext() 函数......尝试使用 getApplicationContext() 代替 .