Facebook SDK 4.0.1登录NPE

大流士

当我尝试在Kitkat上登录Facebook时，我得到了NPE，在Lollipop MR1上运行良好。我尝试了4.0.0和4.0.1

我的登录代码：

LoginManager.getInstance().logInWithReadPermissions(this, Arrays.asList(READ_PERMISSIONS));

崩溃是

java.lang.RuntimeException: Unable to start activity ComponentInfo{lt.segfoltas.psm/com.facebook.FacebookActivity}: java.lang.NullPointerException
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2198)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257)
            at android.app.ActivityThread.access$800(ActivityThread.java:139)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5086)
            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:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.NullPointerException
            at com.facebook.login.LoginFragment.onCreate(LoginFragment.java:68)
            at android.support.v4.app.Fragment.performCreate(Fragment.java:1763)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:915)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1136)
            at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1499)
            at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:548)
            at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1194)
            at android.app.Activity.performStart(Activity.java:5258)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2171)
            at  android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257)
            at android.app.ActivityThread.access$800(ActivityThread.java:139)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5086)
            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:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
            at dalvik.system.NativeStart.main(Native Method)

相关清单条目

<activity android:name="com.facebook.FacebookActivity"
            android:configChanges=
                "keyboard|keyboardHidden|screenLayout|screenSize|orientation"
            android:theme="@android:style/Theme.Translucent.NoTitleBar"
            android:label="@string/app_name" />

应用程序ID在onCreate中设置

    FacebookSdk.setApplicationId(FacebookData.APP_ID);
    FacebookSdk.sdkInitialize(getApplicationContext());

致电登录后，我立即收到一个响应，指出登录已被取消。然后该应用程序崩溃。

报告崩溃的Facebook代码：

this.callingPackage = this.getActivity().getCallingActivity().getPackageName();

我的权限：

private static final String[] READ_PERMISSIONS = new String[]{"public_profile", "user_events", "user_birthday", "email"};

大流士

找出崩溃的原因。如果调用活动设置为singleInstance，则Login方法在Facebook的LoginFragment内部崩溃。我不知道是否有解决方法。

编辑：

看来Facebook可以部分解决SDK 4.1中的问题

4.0有：

this.callingPackage = this.getActivity().getCallingActivity().getPackageName();

当从singleInstance活动调用登录时，这将导致NPE。

现在看来，如果发生这种情况，LoginActivity将退出并报告错误。

    // 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);
        getActivity().finish();
        return;
    }

本文收集自互联网，转载请注明来源。

如有侵权，请联系 [email protected] 删除。