Android下使用最新FaceBook SDK 3.0(二)使用facebook实现登录注销

前一篇我们学习了集成FacebookSDK到我们项目工程中，这篇来学习一下如何使用facebook来登录！

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"tools:context=".MainActivity" ><com.facebook.widget.LoginButtonandroid:id="@+id/login_button"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_horizontal"android:layout_marginBottom="30dp"android:layout_marginTop="30dp" />
</LinearLayout>

2、创建MainFragment 类，并且继承Fragment 类，

重写onCreateView()方法

通过LoginButton设置权限 setReadPermissions() 更多权限访问 http://developers.facebook.com/docs/reference/login/#permissions

重写 onSessionStateChange()方法，作用：当session状态改变时调用该方法，state.isOpened() 为 true 时，则证明登录成功！

package com.thirdfacebook;import java.util.Arrays;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 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() {@Overridepublic void call(Session session, SessionState state,Exception exception) {onSessionStateChange(session, state, exception);}};@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);uiHelper = new UiLifecycleHelper(getActivity(), callback);uiHelper.onCreate(savedInstanceState);}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {View view = inflater.inflate(R.layout.activity_main, container, false);LoginButton authButton = (LoginButton) view.findViewById(R.id.login_button);authButton.setFragment(this);authButton.setReadPermissions(Arrays.asList("email","user_likes", "user_status"));return view;}private void onSessionStateChange(Session session, SessionState state,Exception exception) {if (state.isOpened()) {Log.i(TAG, "Logged in...");} else if (state.isClosed()) {Log.i(TAG, "Logged out...");}}@Overridepublic 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();}@Overridepublic void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);uiHelper.onActivityResult(requestCode, resultCode, data);}@Overridepublic void onPause() {super.onPause();uiHelper.onPause();}@Overridepublic void onDestroy() {super.onDestroy();uiHelper.onDestroy();}@Overridepublic void onSaveInstanceState(Bundle outState) {super.onSaveInstanceState(outState);uiHelper.onSaveInstanceState(outState);}
}

3、MainActivity 类，继承FragmentActivity类，初始化添加MainFragment 类，打印哈希值可写可不写

package com.thirdfacebook;import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.Signature;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Base64;
import android.util.Log;
import android.view.Menu;public class MainActivity extends FragmentActivity {private MainFragment mainFragment;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);if (savedInstanceState == null) {// Add the fragment on initial activity setupmainFragment = new MainFragment();getSupportFragmentManager().beginTransaction().add(android.R.id.content, mainFragment).commit();} else {// Or set the fragment from restored state infomainFragment = (MainFragment) getSupportFragmentManager().findFragmentById(android.R.id.content);}/*** 打印哈希值*/try {PackageInfo info = getPackageManager().getPackageInfo("com.firstfacebook", PackageManager.GET_SIGNATURES);for (Signature signature : info.signatures) {MessageDigest md = MessageDigest.getInstance("SHA");md.update(signature.toByteArray());Log.i("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));}} catch (NameNotFoundException e) {} catch (NoSuchAlgorithmException e) {}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.activity_main, menu);return true;}
}

4、AndroidMainfest.xml 添加 facebook LoginActivity(登录activity)

<activity android:name="com.facebook.LoginActivity"/>

5、运行项目成功运行后登录按钮变成Log Out, 点击Log Out则注销

参考自：http://developers.facebook.com/docs/howtos/androidsdk/3.0/login-with-facebook/

如果错误，望大牛多多指出！

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