I\'m trying to log in without using login button. I followed facebook tutorial but i can not get it work, always give me NullPointerException. My Manifest:
&
1) u should initialize sdk before setContentView()
2) u should write Loginmanager.getInstance().logInWithReadPermission(.....) on some button click listener
Try moving your meta-data and activity under the application node rather than the first activity node.
<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>
Your issue is that you use FacebookSdk.sdkInitialize(getApplicationContext());
after setContentView(R.layout.activity_main);
. You should use it before setContentView()
. A full facebook login example with sample code can be found here.
Ok I don't know if you had already solve your problem but here is how I solved it
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");
}
});
maybe your forgot that add this code as bellowed in your 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" />
Try in this way:
Create Android app on Facebook developer and set it to public instead development mode.
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
If you want to use fragment for Login the proper way is:
Step 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());
}
});
}
Step 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);
}
}
Step 3: - inside OnClickListener
LoginManager.getInstance().logInWithReadPermissions(YourFragment.this, Arrays.asList("public_profile"));
I was using getActivity()
and because of this every time something flashes instead showing Facebook Login view. Basically instead getActivity()
have to use FragmentClaseName.this
. I hope this will help u. Happy coding!!!