inicio - iniciar sesion con facebook android studio

Facebook SDK 4.0.1 Inicio de sesión sin botón de inicio de sesión

Question

Estoy intentando iniciar sesión sin usar el botón de inicio de sesión. Seguí el tutorial de Facebook pero no puedo hacerlo funcionar, siempre dame NullPointerException. Mi manifiesto

<?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>

Mi actividad que uso para iniciar sesión en facebook:

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);
    }
}

Mi gato de registro:

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)

Intenté todo pero terminé con NullPointerException ¡ Por favor, ayúdame!

Answer 1

1) Debes inicializar sdk antes de setContentView ()

2) Debes escribir Loginmanager.getInstance (). LogInWithReadPermission (.....) en un oyente de clic de botón

Answer 2

Intenta de esta manera:

• Cree una aplicación de Android en el desarrollador de Facebook y configúrela en modo de desarrollo público.

• Manifiesto:

      <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

• Si quieres usar el fragmento para iniciar sesión de la forma correcta es:

Paso 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());
                }
            });
    }

Paso 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);
        }
    }

Paso 3: - dentro de OnClickListener

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

Estaba usando getActivity() y debido a esto cada vez que algo parpadea, se muestra la vista Inicio de sesión de Facebook. Básicamente, en cambio, getActivity() tiene que usar FragmentClaseName.this . Espero que esto te ayude. Feliz codificacion !!!

Answer 3

Intente mover sus metadatos y actividad en el nodo de la aplicación en lugar del primer nodo de actividad.

<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 4

Ok, no sé si ya habías resuelto tu problema pero aquí es cómo lo resolví

 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 5

Su problema es que utiliza FacebookSdk.sdkInitialize(getApplicationContext()); después de setContentView(R.layout.activity_main); . Deberías usarlo antes de setContentView() . Un ejemplo completo de inicio de sesión en Facebook con código de ejemplo se puede encontrar here .

Answer 6

quizás olvidó que agregar este código como se ve en su AndroidManifest.xml

<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" />