我收到了很多用户关于我的应用程序崩溃的报告。常量错误似乎与我的 parse.com 初始化有关，但是，我已经按照解析教程中的概述进行了设置。

这是堆栈跟踪:

java.lang.RuntimeException: Unable to start receiver com.parse.ParseBroadcastReceiver: java.lang.RuntimeException: applicationContext is null. You must call Parse.initialize(context, applicationId, clientKey) before using the Parse library.
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2580)
at android.app.ActivityThread.access$1700(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.RuntimeException: applicationContext is null. You must call Parse.initialize(context, applicationId, clientKey) before using the Parse library.
at com.parse.Parse.checkContext(Parse.java:606)
at com.parse.Parse.getApplicationContext(Parse.java:214)
at com.parse.ManifestInfo.getContext(ManifestInfo.java:322)
at com.parse.ManifestInfo.getPackageManager(ManifestInfo.java:330)
at com.parse.ManifestInfo.getPackageInfo(ManifestInfo.java:356)
at com.parse.ManifestInfo.deviceSupportsGcm(ManifestInfo.java:441)
at com.parse.ManifestInfo.getPushType(ManifestInfo.java:210)
at com.parse.PushService.startServiceIfRequired(PushService.java:168)
at com.parse.ParseBroadcastReceiver.onReceive(ParseBroadcastReceiver.java:19)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2573)
... 10 more

这是我的初始化代码:

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home_screen);
        Parse.initialize(this, "hGG5RdgNVdI7eCeZynV32lWYXywQRHkpp5zLdY7Q", "TwmNbpBYEt4u3euE3lzNIgwyroSl8RPGF2dJFsPv");

        ParseInstallation.getCurrentInstallation().saveInBackground();

任何人都可以看到导致此错误的原因以及如何修复它吗？

下面是我的接收者代码:

public static class Receiver extends ParsePushBroadcastReceiver {
        private String notificationText;
        private Boolean notificationreceived = false;
        public Receiver(){
        }
        private static final String TAG = "MyNotificationsReceiver";

        @Override
        public void onPushOpen(Context context, Intent intent) {
            Log.e("Push", "Clicked");
            Intent i = new Intent(context, HomeScreen.class);
            notificationreceived = true;
            i.putExtra("alert",notificationText);
            i.putExtra("alertreceived", notificationreceived);
            i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(i);
            Scb998.scb988b=true;

                try {
                    JSONObject json = new JSONObject(intent.getExtras().getString("com.parse.Data"));

                    Scb998.msg = json.getString("alert");


                } catch (JSONException e) {
                    Log.d(TAG, "JSONException: " + e.getMessage());

            }
        }

    }

最佳答案

将您的 Parse 初始化移动到您的 App 类(从 Application 扩展)

public class App extends Application {
   @Override
   public void onCreate() {
        super.onCreate();
        Parse.initialize(this, "hGG5RdgNVdI7eCeZynV32lWYXywQRHkpp5zLdY7Q", "TwmNbpBYEt4u3euE3lzNIgwyroSl8RPGF2dJFsPv");
        ParseInstallation.getCurrentInstallation().saveInBackground();
    }
}

当然，请引用您的 AndroidManifest.xml

<application
    android:name=".app.App"
    ....
</application>

接下来是崩溃的原因。当您的应用程序处于后台时，它可能会被系统杀死。来自 Google guide

A process holding an activity that's not currently visible to the user (the activity's onStop() method has been called). These processes have no direct impact on the user experience, and the system can kill them at any time to reclaim memory for a foreground, visible, or service process. Usually there are many background processes running, so they are kept in an LRU (least recently used) list to ensure that the process with the activity that was most recently seen by the user is the last to be killed. If an activity implements its lifecycle methods correctly, and saves its current state, killing its process will not have a visible effect on the user experience, because when the user navigates back to the activity, the activity restores all of its visible state. See the Activities document for information about saving and restoring state.

当您的应用程序收到推送通知时，parse 将不会被初始化，因为您在 Activity onCreate 方法中对其进行了初始化，该方法不会被调用。

关于android - Parse.com 运行时崩溃 - android，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27538261/