Android Open Source - android-3.0-howtos Main Fragment

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License

The source code is released under:

Copyright 2012-present Facebook, Inc. You are hereby granted a non-exclusive, worldwide, royalty-free license to use, copy, modify, and distribute this software in source code or binary form for use ...

Java Source Code

package com.facebook.samples.publishfeedhowto;
//from   ww  w  .j av  a2  s  . c o  m
import java.util.Arrays;
import java.util.Collection;
import java.util.List;

import org.json.JSONException;
import org.json.JSONObject;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

import com.facebook.FacebookRequestError;
import com.facebook.HttpMethod;
import com.facebook.Request;
import com.facebook.RequestAsyncTask;
import com.facebook.Response;
import com.facebook.Session;
import com.facebook.SessionState;
import com.facebook.UiLifecycleHelper;
import com.facebook.widget.LoginButton;

public class MainFragment extends Fragment {
  
  private static final String TAG = "MainFragment";
  
  private UiLifecycleHelper uiHelper;
    private Session.StatusCallback callback = new Session.StatusCallback() {
        @Override
        public void call(final Session session, final SessionState state, final Exception exception) {
            onSessionStateChange(session, state, exception);
        }
    };
    
  private Button shareButton;
  
  private static final List<String> PERMISSIONS = Arrays.asList("publish_actions");
  
  private static final String PENDING_PUBLISH_KEY = "pendingPublishReauthorization";
  
  private boolean pendingPublishReauthorization = false;
  
  @Override
  public View onCreateView(LayoutInflater inflater, 
      ViewGroup container, 
      Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.main, container, false);
        
    LoginButton authButton = (LoginButton) view.findViewById(R.id.authButton);
    authButton.setFragment(this);
    
    shareButton = (Button) view.findViewById(R.id.shareButton);
    shareButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            publishStory();        
        }
    });
    
    if (savedInstanceState != null) {
      pendingPublishReauthorization = 
        savedInstanceState.getBoolean(PENDING_PUBLISH_KEY, false);
    }
    return view;
  }
    
  @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        uiHelper = new UiLifecycleHelper(getActivity(), callback);
        uiHelper.onCreate(savedInstanceState);
    }

    @Override
    public void onResume() {
        super.onResume();
        
        // For scenarios where the main activity is launched and user
    // session is not null, the session state change notification
    // may not be triggered. Trigger it if it's open/closed.
    Session session = Session.getActiveSession();
    if (session != null &&
        (session.isOpened() || session.isClosed()) ) {
      onSessionStateChange(session, session.getState(), null);
    }
    
        uiHelper.onResume();
    }
    
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        uiHelper.onActivityResult(requestCode, resultCode, data);
    }
    
    @Override
    public void onPause() {
        super.onPause();
        uiHelper.onPause();
    }
    
    @Override
    public void onDestroy() {
        super.onDestroy();
        uiHelper.onDestroy();
    }
    
    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putBoolean(PENDING_PUBLISH_KEY, pendingPublishReauthorization);
        uiHelper.onSaveInstanceState(outState);
    }
  
  private void onSessionStateChange(Session session, SessionState state, Exception exception) {
        if (state.isOpened()) {
            shareButton.setVisibility(View.VISIBLE);
            if (pendingPublishReauthorization && 
                state.equals(SessionState.OPENED_TOKEN_UPDATED)) {
              pendingPublishReauthorization = false;
              publishStory();
            }
        } else if (state.isClosed()) {
            shareButton.setVisibility(View.INVISIBLE);
        }
    }

  private void publishStory() {
      Session session = Session.getActiveSession();
      if (session != null) {

        // Check for publish permissions    
        List<String> permissions = session.getPermissions();
            if (!isSubsetOf(PERMISSIONS, permissions)) {
              pendingPublishReauthorization = true;
                Session.NewPermissionsRequest newPermissionsRequest = new Session
                        .NewPermissionsRequest(this, PERMISSIONS);
                session.requestNewPublishPermissions(newPermissionsRequest);
                return;
           }

        Bundle postParams = new Bundle();
        postParams.putString("name", "Facebook SDK for Android");
        postParams.putString("caption", "Build great social apps and get more installs.");
        postParams.putString("description", "The Facebook SDK for Android makes it easier and faster to develop Facebook integrated Android apps.");
        postParams.putString("link", "https://developers.facebook.com/android");
        postParams.putString("picture", "https://raw.github.com/fbsamples/ios-3.x-howtos/master/Images/iossdk_logo.png");

        Request.Callback callback= new Request.Callback() {
            public void onCompleted(Response response) {
                JSONObject graphResponse = response
                                           .getGraphObject()
                                           .getInnerJSONObject();
                String postId = null;
                try {
                    postId = graphResponse.getString("id");
                } catch (JSONException e) {
                    Log.i(TAG,
                        "JSON error "+ e.getMessage());
                }
                FacebookRequestError error = response.getError();
                if (error != null) {
                    Toast.makeText(getActivity()
                         .getApplicationContext(),
                         error.getErrorMessage(),
                         Toast.LENGTH_SHORT).show();
                    } else {
                        Toast.makeText(getActivity()
                             .getApplicationContext(), 
                             postId,
                             Toast.LENGTH_LONG).show();
                }
            }
        };

        Request request = new Request(session, "me/feed", postParams, 
                              HttpMethod.POST, callback);

        RequestAsyncTask task = new RequestAsyncTask(request);
        task.execute();
    }
  }
  
  private boolean isSubsetOf(Collection<String> subset, Collection<String> superset) {
      for (String string : subset) {
          if (!superset.contains(string)) {
              return false;
          }
      }
      return true;
  }

}

Java Source Code List

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