Facebook SDK 4.0.1 Login ohne Login-Button

Question

Ich versuche mich einzuloggen, ohne Login-Taste. Ich folgte Facebook Tutorial, aber ich kann es nicht funktionieren, geben Sie mir immer NullPointerException. Mein Manifest:

<?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> 

Meine Tätigkeit, die ich ihn nutzen Facebook einloggen:

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); 
    } 
} 

Meine Log Katze:

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) 

ich alles versucht, aber am Ende mit Nullpointer Bitte helfen Sie mir!

Answer 1

Versuchen Sie, Ihre Metadaten und Aktivitäten unter dem Anwendungsknoten und nicht am ersten Aktivitätsknoten zu verschieben.

<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> 

Answer 2

Ihr Problem ist, dass Sie FacebookSdk.sdkInitialize(getApplicationContext()); nach setContentView(R.layout.activity_main); verwenden. Sie sollten es vorsetContentView() verwenden. Ein voller Facebook Login Beispiel mit Beispielcode kann here gefunden werden.

Answer 3

Ok ich weiß nicht, ob Sie bereits Ihr Problem lösen, aber hier ist, wie ich es

gelöst

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"); 

       } 
      }); 

Answer 4

1) u sdk vor setContentView()

2) initialisieren sollte u sollte schreiben Loginmanager.getInstance(). logInWithReadPermission (.....) auf einig Button-Klick-Listener

Answer 5

vielleicht vergessen haben, Sie, dass dieser Code hinzufügen, wie in AndroidManifest.xml bellte

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

Answer 6

Versuch auf diese Weise:

• erstellen Android App auf Facebook Entwickler und setzen Sie sich auf öffentlichen statt Entwicklungsmodus.

• Manifest:

  <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:label="@string/app_name"/> 
  

• Strings.xml

  XXXXXXXXXXXXXX

• Wenn Sie Fragment verwenden möchten für Login, um die richtige Art und Weise ist:

Schritt 1:

CallbackManager mCallbackManager; 

    @Override 
    public void onCreate(@Nullable Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     //@Deprecated for latest version, without this line working fine. 
     //FacebookSdk.sdkInitialize(getActivity().getApplicationContext()); 


     mCallbackManager = CallbackManager.Factory.create(); 

     LoginManager.getInstance().registerCallback(mCallbackManager, 
      new FacebookCallback<LoginResult>() { 
       @Override 
       public void onSuccess(LoginResult loginResult) { 
        // App code 
        Log.e("Success", "Login"); 
        Bundle parameters = new Bundle(); 
        parameters.putString("fields", "id, first_name, last_name ,email, gender, birthday"); 

        GraphRequest gr = GraphRequest.newMeRequest(
          loginResult.getAccessToken(), new GraphRequest.GraphJSONObjectCallback() { 
           @Override 
           public void onCompleted(JSONObject json, GraphResponse response) { 
            if (response.getError() != null) { 
             // handle error 
             System.out.println("ERROR "+response.getError().toString()); 
            } else { 
             //System.out.println("Success"); 
             try { 

              String jsonresult = String.valueOf(json); 
              System.out.println("JSON Result"+jsonresult); 
              String resp = String.valueOf(response.getJSONObject()); 
              System.out.println("JSON resp "+resp); 


             } catch (JSONException e) { 
              e.printStackTrace(); 
             } 
            } 
           } 

          }); 
        gr.setParameters(parameters); 
        gr.executeAsync(); 

       } 

       @Override 
       public void onCancel() { 
        // App code 
        Log.e("onCancel", "Login"); 
       } 

       @Override 
       public void onError(FacebookException onError) { 
        // App code 
        Log.e("onError", "Login "+onError.getMessage()); 
       } 
      }); 
    } 

Schritt 2:

@Override 
    public void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 
     if (resultCode == Activity.RESULT_OK) { 
      mCallbackManager.onActivityResult(requestCode, resultCode, data); 
     } 
    } 

Schritt 3: - innen OnClickListener

LoginManager.getInstance().logInWithReadPermissions(YourFragment.this, Arrays.asList("public_profile")); 

Ich war mit getActivity() und aus diesem Grund jedes Mal etwas blinkt stattdessen Ansicht Facebook Login zeigt. Grundsätzlich muss statt getActivity()FragmentClaseName.this verwendet werden. Ich hoffe, das wird dir helfen. Fröhliche Codierung !!!