Facebook SDK 4.0.1不带登录按钮的登录
Facebook SDK 4.0.1不带登录按钮的登录
提问于 2015-04-15 02:19:28
我正在尝试不使用登录按钮进行登录。我关注了facebook的教程，但我不能让它工作，总是给我NullPointerException。我的宣言：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.hema.testfcaebooksdk" >
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<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" />
<provider android:authorities="com.facebook.app.FacebookContentProvider****************"
android:name="com.facebook.FacebookContentProvider"
android:exported="true" />
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>我使用它登录facebook的活动：
public class MainActivity extends ActionBarActivity {
CallbackManager callbackManager;
LoginManager loginManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FacebookSdk.sdkInitialize(getApplicationContext());
callbackManager = CallbackManager.Factory.create();
loginManager = LoginManager.getInstance();
loginManager.registerCallback(callbackManager,
new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
// App code
Toast.makeText(getApplicationContext(), loginResult.getAccessToken().toString(), Toast.LENGTH_SHORT).show();
}
@Override
public void onCancel() {
// App code
}
@Override
public void onError(FacebookException exception) {
// App code
}
});
Collection<String> permissions = Arrays.asList("public_profile", "user_friends");
loginManager.logInWithReadPermissions(this, permissions); // Null Pointer Exception here
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
callbackManager.onActivityResult(requestCode, resultCode, data);
}
}我的日志猫：
04-14 20:03:46.840 8075-8075/com.example.hema.testfacebooksdk E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.hema.testfacebooksdk, PID: 8075
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.hema.testfacebooksdk/com.example.hema.testfacebooksdk.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2413)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2471)
at android.app.ActivityThread.access$900(ActivityThread.java:175)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5602)
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:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.facebook.login.LoginManager.getLogger(LoginManager.java:391)
at com.facebook.login.LoginManager.logCompleteLogin(LoginManager.java:414)
at com.facebook.login.LoginManager.startLogin(LoginManager.java:384)
at com.facebook.login.LoginManager.logInWithReadPermissions(LoginManager.java:262)
at com.example.hema.testfacebooksdk.MainActivity.onCreate(MainActivity.java:59)
at android.app.Activity.performCreate(Activity.java:5451)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2377)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2471)
at android.app.ActivityThread.access$900(ActivityThread.java:175)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5602)
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:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)我试了所有的方法，但最终还是得到了NullPointerException，请帮帮我！
回答 6
Stack Overflow用户
发布于 2015-04-17 16:09:08
好吧，我不知道你是否已经解决了你的问题，但这是我是如何解决它的
List<String> permissionNeeds= Arrays.asList("user_photos", "friends_photos", "email", "user_birthday", "user_friends");
super.onCreate(savedInstanceState);
FacebookSdk.sdkInitialize(getApplicationContext());
mCallbackManager = CallbackManager.Factory.create();
LoginManager.getInstance().logInWithReadPermissions(
this,
permissionNeeds);
LoginManager.getInstance().registerCallback(mCallbackManager,
new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResults) {
GraphRequest request = GraphRequest.newMeRequest(
loginResults.getAccessToken(),
new GraphRequest.GraphJSONObjectCallback() {
@Override
public void onCompleted(
JSONObject object,
GraphResponse response) {
// Application code
Log.v("LoginActivity", response.toString());
}
});
Bundle parameters = new Bundle();
parameters.putString("fields", "id,name,email,gender, birthday");
request.setParameters(parameters);
request.executeAsync();
}
@Override
public void onCancel() {
Log.e("dd","facebook login canceled");
}
@Override
public void onError(FacebookException e) {
Log.e("dd", "facebook login failed error");
}
});Stack Overflow用户
发布于 2015-04-15 04:30:56
尝试将元数据和活动移动到应用程序节点下，而不是第一个活动节点下。
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/>
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.facebook.FacebookActivity" />
</application>Stack Overflow用户
发布于 2015-04-16 19:11:41
你的问题是你在setContentView(R.layout.activity_main);之后使用FacebookSdk.sdkInitialize(getApplicationContext());。您应该在 setContentView()之前使用它。完整的facebook登录示例和示例代码可以在here中找到。
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原文链接：
https://stackoverflow.com/questions/29634660
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