我正在尝试遵循此处的 facebook 教程https://developers.facebook.com/docs/getting-started/facebook-sdk-for-android/3.0/但我在 onActivityResult 有任何想法吗？我的和他们的唯一区别就是我的是一个碎片。
package com.projectcaruso.naturalfamilyplaning;
import com.facebook.*;
import com.facebook.model.*;
import com.projectcaruso.naturalfamilyplanning.R;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import android.content.Context;
import android.content.Intent;
public class facebooklogin extends Fragment{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_login, container, false);
// start Facebook Login
Session.openActiveSession(getActivity(), this, true, new Session.StatusCallback() {
// callback when session changes state
@Override
public void call(Session session, SessionState state, Exception exception) {
if (session.isOpened()) {
// make request to the /me API
Request.executeMeRequestAsync(session, new Request.GraphUserCallback() {
// callback after Graph API response with user object
@Override
public void onCompleted(GraphUser user, Response response) {
if (user != null) {
Context context = getActivity();
Toast.makeText(context, "Hello " + user.getName() + "!", Toast.LENGTH_LONG).show();
}
}
});
}
}
});
return view;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data);
}
}
编辑：我把它改成了 getActivity() 但现在我明白了
05-14 17:10:23.904: E/AndroidRuntime(791): FATAL EXCEPTION: main
05-14 17:10:23.904: E/AndroidRuntime(791): java.lang.NullPointerException: Argument 'applicationId' cannot be null
05-14 17:10:23.904: E/AndroidRuntime(791): at com.facebook.internal.Validate.notNull(Validate.java:29)
05-14 17:10:23.904: E/AndroidRuntime(791): at com.facebook.Session.<init>(Session.java:224)
05-14 17:10:23.904: E/AndroidRuntime(791): at com.facebook.Session.<init>(Session.java:213)
05-14 17:10:23.904: E/AndroidRuntime(791): at com.facebook.Session$Builder.build(Session.java:1454)
05-14 17:10:23.904: E/AndroidRuntime(791): at com.facebook.Session.openActiveSession(Session.java:863)
05-14 17:10:23.904: E/AndroidRuntime(791): at com.facebook.Session.openActiveSession(Session.java:828)
05-14 17:10:23.904: E/AndroidRuntime(791): at com.projectcaruso.naturalfamilyplaning.facebookFragment.onCreateView(facebookFragment.java:29)
05-14 17:10:23.904: E/AndroidRuntime(791): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
05-14 17:10:23.904: E/AndroidRuntime(791): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
05-14 17:10:23.904: E/AndroidRuntime(791): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
05-14 17:10:23.904: E/AndroidRuntime(791): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
05-14 17:10:23.904: E/AndroidRuntime(791): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
05-14 17:10:23.904: E/AndroidRuntime(791): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429)
05-14 17:10:23.904: E/AndroidRuntime(791): at android.os.Handler.handleCallback(Handler.java:725)
05-14 17:10:23.904: E/AndroidRuntime(791): at android.os.Handler.dispatchMessage(Handler.java:92)
05-14 17:10:23.904: E/AndroidRuntime(791): at android.os.Looper.loop(Looper.java:137)
05-14 17:10:23.904: E/AndroidRuntime(791): at android.app.ActivityThread.main(ActivityThread.java:5041)
05-14 17:10:23.904: E/AndroidRuntime(791): at java.lang.reflect.Method.invokeNative(Native Method)
05-14 17:10:23.904: E/AndroidRuntime(791): at java.lang.reflect.Method.invoke(Method.java:511)
05-14 17:10:23.904: E/AndroidRuntime(791): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-14 17:10:23.904: E/AndroidRuntime(791): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-14 17:10:23.904: E/AndroidRuntime(791): at dalvik.system.NativeStart.main(Native Method)
仅供参考，这在我的清单中，我的字符串文件中的 app_id 也是如此。
meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/app_id"
显现：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.projectcaruso.naturalfamilyplanning"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET"/>
<meta-data
android:name="com.facebook.sdk.ApplicationId"
android:value="@string/app_id"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.projectcaruso.naturalfamilyplaning.FragmentChange"
android:configChanges="orientation|screenSize|screenLayout"
android:theme="@style/Theme.Sherlock.Light.DarkActionBar"
android:uiOptions="splitActionBarWhenNarrow" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.projectcaruso.naturalfamilyplaning.UserSettingActivity" >
</activity>
<activity
android:name="com.projectcaruso.naturalfamilyplaning.HistoryFragment"
android:label="@string/title_activity_history_fragment" >
</activity>
</application>
</manifest>