Facebook登录 - 无法使用null调用包调用LoginActivity

Question

我有一个没有指定launchMode的活动A,它使用Facebook SDK登录.

活动A启动活动B,即启动模式singleTop.

不知何故,我在简历中定期遇到这个错误,在极少数情况下.

关于这可能是什么的任何想法？如果我没有从指定了启动模式的任何活动进行任何Facebook SDK调用,我并不完全理解我是如何做到的.我在这个错误上运行的所有其他内容涉及对此错误文本的非常简单的解释,这似乎不是.

这只发生在Resume上.为了更加清楚,在活动的正常过程中,一切正常,Facebook登录窗口启动正常,等等.

在我的清单中我确实有:

<activity android:name="com.facebook.LoginActivity"/>

以及发起活动

<activity android:name="mypackage.login.SocialLoginActivity" android:screenOrientation="portrait">

错误文字:

java.lang.RuntimeException: Unable to resume activity {mypackage/com.facebook.LoginActivity}: com.facebook.FacebookException: Cannot call LoginActivity with a null calling package. This can occur if the launchMode of the caller is singleInstance.
       at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2639)
       at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2667)
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2140)
       at android.app.ActivityThread.access$700(ActivityThread.java:140)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1237)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loop(Looper.java:137)
       at android.app.ActivityThread.main(ActivityThread.java:4921)
       at java.lang.reflect.Method.invokeNative(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:511)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
       at dalvik.system.NativeStart.main(NativeStart.java)
Caused by: com.facebook.FacebookException: Cannot call LoginActivity with a null calling package. This can occur if the launchMode of the caller is singleInstance.
       at com.facebook.LoginActivity.onResume(LoginActivity.java:111)
       at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1199)
       at android.app.Activity.performResume(Activity.java:5280)
       at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2629)
       at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2667)
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2140)
       at android.app.ActivityThread.access$700(ActivityThread.java:140)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1237)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loop(Looper.java:137)
       at android.app.ActivityThread.main(ActivityThread.java:4921)
       at java.lang.reflect.Method.invokeNative(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:511)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
       at dalvik.system.NativeStart.main(NativeStart.java)

Answer 1

我也遇到了这个问题.如果你查看LoginActivity的facebook源代码,你会发现以下评论:

    // If the calling package is null, this generally means that the callee was started
    // with a launchMode of singleInstance. Unfortunately, Android does not allow a result
    // to be set when the callee is a singleInstance, so we log an error and return.
    if (callingPackage == null) {
        Log.e(TAG, NULL_CALLING_PKG_ERROR_MSG);
        finish();
        return;
    }

如果你将清单(AndroidManifest.xml)调整为'singleInstance'之外的其他东西(我选择标准 - 这里概述了差异):

<activity
  android:name="com.your.package.YourActivity"
  android:label="@string/app_name"
  android:launchMode="singleInstance" >

至:

<activity
  android:name="com.your.package.YourActivity"
  android:label="@string/app_name"
  android:launchMode="standard" >

然后认证正常进行!