【FacebookSDK学习笔记】Facebook分享（在登陆的基础上）

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1、打开 res/layout/activity_main.xml,在布局中添加一个facebook分享按钮

<Button
        android:id="@+id/shareButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:gravity="center"
        android:text="@string/share"
        android:textStyle="bold"
        android:visibility="invisible" />

其中，android:visibility="invisible" 在登陆之前是隐藏的，在登陆之后才设置显示。

2、在MainFragment中的onSessionStateChange()这个函方法中添加修改，使用户登陆之后就把分享按钮设置成visible。

 private void onSessionStateChange(Session session, SessionState state,  
            Exception exception) {  
        if (state.isOpened()) {  
            Log.i(TAG, "Logged in...");  
            shareButton.setVisibility(View.VISIBLE);
            if (pendingPublishReauthorization && 
                    state.equals(SessionState.OPENED_TOKEN_UPDATED)) {
                pendingPublishReauthorization = false;
                publishStory();
            }
        } else if (state.isClosed()) {  
            Log.i(TAG, "Logged out..."); 
            shareButton.setVisibility(View.INVISIBLE);
        }  
    }   

2、在MainFragment中添加一个方法publishStory()，在此部分添加修改链接、图片和分享内容

 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();   
    				}}
    	}
    }

4、再添加isSubsetOf()方法：

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

5、在MainFragment的声明部分加上：

rivate Button shareButton;
private static final List<String> PERMISSIONS = Arrays.asList("publish_actions");
private static final String PENDING_PUBLISH_KEY = "pendingPublishReauthorization";
private boolean pendingPublishReauthorization = false;

6、在onSaveInstanceState()方法里再添加一句，如下：

@Override  
    public void onSaveInstanceState(Bundle outState) {  
        super.onSaveInstanceState(outState);  
        outState.putBoolean(PENDING_PUBLISH_KEY, pendingPublishReauthorization);
        uiHelper.onSaveInstanceState(outState);  
    }  

7、在onActivityResult()方法里面注释

//uiHelper.onActivityResult(requestCode, resultCode, data);  

并加上

uiHelper.onActivityResult(requestCode, resultCode, data, new FacebookDialog.Callback() {
            @Override
            public void onError(FacebookDialog.PendingCall pendingCall, Exception error, Bundle data) {
                Log.e("Activity", String.format("Error: %s", error.toString()));
            }

            @Override
            public void onComplete(FacebookDialog.PendingCall pendingCall, Bundle data) {
                Log.i("Activity", "Success!");
            }
        });

8、在onCreateView()方法里添加shareButton的click事件即可

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);
        }

如下图：

9、分享结果如下，当然，这是后台分享：

10、前台分享，在shareButton的onclick事件中，把publishStory()替换为publishFeedDialog()，并添加publishFeedDialog()方法，就可以了：

@Override
public void onClick(View v) {
		// publishStory();   //后台分享
		publishFeedDialog();  //前台分享
		if (FacebookDialog.canPresentShareDialog(getActivity()
						.getApplicationContext(),
						FacebookDialog.ShareDialogFeature.SHARE_DIALOG)) {
					// Publish the post using the Share Dialog
					FacebookDialog shareDialog = new FacebookDialog.ShareDialogBuilder(
							getActivity()).setLink(
							"https://developers.facebook.com/android").build();
					uiHelper.trackPendingDialogCall(shareDialog.present());

				} else {
					// Fallback. For example, publish the post using the Feed
					// Dialog
				}
			}

添加publishFeedDialog()方法：

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

		WebDialog feedDialog = (new WebDialog.FeedDialogBuilder(getActivity(),
				Session.getActiveSession(), params)).setOnCompleteListener(
				new OnCompleteListener() {

					@Override
					public void onComplete(Bundle values,
							FacebookException error) {
						if (error == null) {
							// When the story is posted, echo the success
							// and the post Id.
							final String postId = values.getString("post_id");
							if (postId != null) {
								Toast.makeText(getActivity(),
										"Posted story, id: " + postId,
										Toast.LENGTH_SHORT).show();
							} else {
								// User clicked the Cancel button
								Toast.makeText(
										getActivity().getApplicationContext(),
										"Publish cancelled", Toast.LENGTH_SHORT)
										.show();
							}
						} else if (error instanceof FacebookOperationCanceledException) {
							// User clicked the "x" button
							Toast.makeText(
									getActivity().getApplicationContext(),
									"Publish cancelled", Toast.LENGTH_SHORT)
									.show();
						} else {
							// Generic, ex: network error
							Toast.makeText(
									getActivity().getApplicationContext(),
									"Error posting story", Toast.LENGTH_SHORT)
									.show();
						}
					}

				}).build();
		feedDialog.show();
	}

如下图：注释掉后台分享部分，添加前台分享代码：

11、附上MainFragment的代码

package com.example.kam;

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.FacebookException;
import com.facebook.FacebookOperationCanceledException;
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.FacebookDialog;
import com.facebook.widget.LoginButton;
import com.facebook.widget.WebDialog;
import com.facebook.widget.WebDialog.OnCompleteListener;

public class MainFragment extends Fragment {
	private static final String TAG = "MainFragment";
	private UiLifecycleHelper uiHelper;
	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;

	private Session.StatusCallback callback = new Session.StatusCallback() {
		@Override
		public void call(Session session, SessionState state,
				Exception exception) {
			onSessionStateChange(session, state, exception);
		}
	};

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		uiHelper = new UiLifecycleHelper(getActivity(), callback);
		uiHelper.onCreate(savedInstanceState);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		View view = inflater.inflate(R.layout.activity_main, container, false);
		shareButton = (Button) view.findViewById(R.id.shareButton);
		shareButton.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				// publishStory();   //后台分享
				publishFeedDialog();  //前台分享
				if (FacebookDialog.canPresentShareDialog(getActivity()
						.getApplicationContext(),
						FacebookDialog.ShareDialogFeature.SHARE_DIALOG)) {
					// Publish the post using the Share Dialog
					FacebookDialog shareDialog = new FacebookDialog.ShareDialogBuilder(
							getActivity()).setLink(
							"https://developers.facebook.com/android").build();
					uiHelper.trackPendingDialogCall(shareDialog.present());

				} else {
					// Fallback. For example, publish the post using the Feed
					// Dialog
				}
			}
		});

		LoginButton authButton = (LoginButton) view
				.findViewById(R.id.login_button);
		authButton.setFragment(this);
		authButton.setReadPermissions(Arrays.asList("email", "user_likes",
				"user_status"));
		if (savedInstanceState != null) {
			pendingPublishReauthorization = savedInstanceState.getBoolean(
					PENDING_PUBLISH_KEY, false);
		}
		return view;
	}

	private void onSessionStateChange(Session session, SessionState state,
			Exception exception) {
		if (state.isOpened()) {
			Log.i(TAG, "Logged in...");
			shareButton.setVisibility(View.VISIBLE);
			if (pendingPublishReauthorization
					&& state.equals(SessionState.OPENED_TOKEN_UPDATED)) {
				pendingPublishReauthorization = false;
				// publishStory();
				publishFeedDialog();
			}
		} else if (state.isClosed()) {
			Log.i(TAG, "Logged out...");
			shareButton.setVisibility(View.INVISIBLE);
		}
	}

	@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);
		uiHelper.onActivityResult(requestCode, resultCode, data,
				new FacebookDialog.Callback() {
					@Override
					public void onError(FacebookDialog.PendingCall pendingCall,
							Exception error, Bundle data) {
						Log.e("Activity",
								String.format("Error: %s", error.toString()));
					}

					@Override
					public void onComplete(
							FacebookDialog.PendingCall pendingCall, Bundle data) {
						Log.i("Activity", "Success!");
					}
				});
	}

	@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 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;
	}

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

		WebDialog feedDialog = (new WebDialog.FeedDialogBuilder(getActivity(),
				Session.getActiveSession(), params)).setOnCompleteListener(
				new OnCompleteListener() {

					@Override
					public void onComplete(Bundle values,
							FacebookException error) {
						if (error == null) {
							// When the story is posted, echo the success
							// and the post Id.
							final String postId = values.getString("post_id");
							if (postId != null) {
								Toast.makeText(getActivity(),
										"Posted story, id: " + postId,
										Toast.LENGTH_SHORT).show();
							} else {
								// User clicked the Cancel button
								Toast.makeText(
										getActivity().getApplicationContext(),
										"Publish cancelled", Toast.LENGTH_SHORT)
										.show();
							}
						} else if (error instanceof FacebookOperationCanceledException) {
							// User clicked the "x" button
							Toast.makeText(
									getActivity().getApplicationContext(),
									"Publish cancelled", Toast.LENGTH_SHORT)
									.show();
						} else {
							// Generic, ex: network error
							Toast.makeText(
									getActivity().getApplicationContext(),
									"Error posting story", Toast.LENGTH_SHORT)
									.show();
						}
					}

				}).build();
		feedDialog.show();
	}
}

【FacebookSDK学习笔记】Facebook分享（在登陆的基础上）

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原文地址：http://blog.csdn.net/lovekam/article/details/43228565