我们正在使用 Parse SDK 并尝试使用 Facebook 功能登录。但我们无法弄清楚。我们得到 NullPointerException。我们的实现有什么问题?
我们使用的 SDK 版本: Parse SDK 1.10.3、 Facebook SDK 4.7.0、 ParseFacebookUtilsV4-1.10.3
堆栈跟踪:
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at com.facebook.login.LoginClient.getLogger(LoginClient.java:363)
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at com.facebook.login.LoginClient.logAuthorizationMethodComplete(LoginClient.java:413)
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at com.facebook.login.LoginClient.tryNextHandler(LoginClient.java:196)
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at com.facebook.login.GetTokenLoginMethodHandler.getTokenCompleted(GetTokenLoginMethodHandler.java:119)
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at com.facebook.login.GetTokenLoginMethodHandler$1.completed(GetTokenLoginMethodHandler.java:74)
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at com.facebook.internal.PlatformServiceClient.callback(PlatformServiceClient.java:157)
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at com.facebook.internal.PlatformServiceClient.handleMessage(PlatformServiceClient.java:141)
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at com.facebook.internal.PlatformServiceClient$1.handleMessage(PlatformServiceClient.java:62)
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at android.os.Looper.loop(Looper.java:145)
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5834)
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1388)
11-08 15:27:34.507 8983-8983/com.taurus.trolley E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1183)
我们在下面添加了此代码以显示。
AndroidManifest.xml:
<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/>
<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" />
我们将下面的代码添加到 Application#onCreate() 方法中。
应用程序#onCreate():
// Facebook SDK initializing
FacebookSdk.sdkInitialize(getApplicationContext());
// Enable Local Datastore.
Parse.enableLocalDatastore(this);
Parse.initialize(this, PARSE_APP_ID, PARSE_CLIENT_KEY);
ParseFacebookUtils.initialize(this);
提供登录功能的代码:
List<String> permissions = Arrays.asList("public_profile", "email");
ParseFacebookUtils.logInWithReadPermissionsInBackground(this, permissions, new LogInCallback() {
@Override
public void done(ParseUser user, ParseException e) {
if (user == null) {
Log.d(TAG, "Uh oh. The user cancelled the Facebook login.");
} else if (user.isNew()) {
Log.d(TAG, "User signed up and logged in through Facebook!");
} else {
Log.d(TAG, "User logged in through Facebook!");
}
}
});