我正在开发一款使用Facebook SDK（v3.6）的小应用程序。经过很多努力，我能够创建一个名为FBLoginActivity的活动（使用父MainActivity），该活动利用我从Facebook SDK中的样本借来的代码（即Scrumptious）。我在主活动中有一个导致FBLoginActivity的按钮（它基本上是一个类似于Scrumptious的登录页面，并且有一个LoginButton来验证用户和会话控制）。
然而，当我尝试运行应用程序并单击按钮时，应用程序崩溃了。我已将Facebook SDK导入我的工作区，所有代码构建都很好。在Facebook开发者页面上，我在我的应用程序中添加了一个Android平台，并标记了以下字段：
包名：com.example.myfbapp 类名：我不确定这是否应该是：com.example.insultdroid.MainActivity或com.example.insultdroid.FBLoginActivity;我尝试过使用这两个选项。
我还在清单中添加了必要的权限和应用ID。
我已成功生成了keyhash，并将“Single Sign On”选项设置为Yes，如开发人员教程中所示。我哪里错了？我错过了什么吗？为什么我的FBLoginActivity无法加载？
以下是FBLoginActivity的代码：
package com.example.myfbapp;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.Menu;
import android.view.MenuItem;
import com.facebook.AppEventsLogger;
import com.facebook.Session;
import com.facebook.SessionState;
import com.facebook.UiLifecycleHelper;
public class FBLoginActivity extends FragmentActivity {
private static final String USER_SKIPPED_LOGIN_KEY = "user_skipped_login";
private static final int SPLASH = 0;
private static final int SELECTION = 1;
private static final int SETTINGS = 2;
private static final int FRAGMENT_COUNT = SETTINGS +1;
private Fragment[] fragments = new Fragment[FRAGMENT_COUNT];
private MenuItem settings;
private boolean isResumed = false;
private boolean userSkippedLogin = false;
private UiLifecycleHelper uiHelper;
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);
if (savedInstanceState != null) {
userSkippedLogin = savedInstanceState.getBoolean(USER_SKIPPED_LOGIN_KEY);
}
uiHelper = new UiLifecycleHelper(this, callback);
uiHelper.onCreate(savedInstanceState);
setContentView(R.layout.activity_fblogin);
FragmentManager fm = getSupportFragmentManager();
SplashFragment splashFragment = (SplashFragment) fm.findFragmentById(R.id.splashFragment);
fragments[SPLASH] = splashFragment;
fragments[SELECTION] = fm.findFragmentById(R.id.selectionFragment);
//fragments[SETTINGS] = fm.findFragmentById(R.id.userSettingsFragment);
FragmentTransaction transaction = fm.beginTransaction();
for(int i = 0; i < fragments.length; i++) {
transaction.hide(fragments[i]);
}
transaction.commit();
splashFragment.setSkipLoginCallback(new SplashFragment.SkipLoginCallback() {
@Override
public void onSkipLoginPressed() {
userSkippedLogin = true;
showFragment(SELECTION, false);
}
});
}
@Override
public void onResume() {
super.onResume();
uiHelper.onResume();
isResumed = true;
// Call the 'activateApp' method to log an app event for use in analytics and advertising reporting. Do so in
// the onResume methods of the primary Activities that an app may be launched into.
AppEventsLogger.activateApp(this);
}
@Override
public void onPause() {
super.onPause();
uiHelper.onPause();
isResumed = false;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
uiHelper.onActivityResult(requestCode, resultCode, data);
}
@Override
public void onDestroy() {
super.onDestroy();
uiHelper.onDestroy();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
uiHelper.onSaveInstanceState(outState);
outState.putBoolean(USER_SKIPPED_LOGIN_KEY, userSkippedLogin);
}
@Override
protected void onResumeFragments() {
super.onResumeFragments();
Session session = Session.getActiveSession();
if (session != null && session.isOpened()) {
// if the session is already open, try to show the selection fragment
showFragment(SELECTION, false);
userSkippedLogin = false;
} else if (userSkippedLogin) {
showFragment(SELECTION, false);
} else {
// otherwise present the splash screen and ask the user to login, unless the user explicitly skipped.
showFragment(SPLASH, false);
}
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// only add the menu when the selection fragment is showing
if (fragments[SELECTION].isVisible()) {
if (menu.size() == 0) {
settings = menu.add(R.string.settings);
}
return true;
} else {
menu.clear();
settings = null;
}
return false;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.equals(settings)) {
showSettingsFragment();
return true;
}
return false;
}
public void showSettingsFragment() {
showFragment(SETTINGS, true);
}
private void onSessionStateChange(Session session, SessionState state, Exception exception) {
if (isResumed) {
FragmentManager manager = getSupportFragmentManager();
int backStackSize = manager.getBackStackEntryCount();
for (int i = 0; i < backStackSize; i++) {
manager.popBackStack();
}
// check for the OPENED state instead of session.isOpened() since for the
// OPENED_TOKEN_UPDATED state, the selection fragment should already be showing.
if (state.equals(SessionState.OPENED)) {
showFragment(SELECTION, false);
} else if (state.isClosed()) {
showFragment(SPLASH, false);
}
}
}
private void showFragment(int fragmentIndex, boolean addToBackStack) {
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
for (int i = 0; i < fragments.length; i++) {
if (i == fragmentIndex) {
transaction.show(fragments[i]);
} else {
transaction.hide(fragments[i]);
}
}
if (addToBackStack) {
transaction.addToBackStack(null);
}
transaction.commit();
}
}
这是AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myfbapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.WRITE_SMS" />
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@drawable/angry_android"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.myfbapp.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.example.myfbapp.FavLogActivity"
android:label="@string/title_activity_fav_log" >
</activity>
<activity
android:name="com.example.myfbapp.FBLoginActivity"
android:label="@string/title_activity_fblogin"
android:parentActivityName="com.example.myfbapp.MainActivity" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.myfbapp.MainActivity" />
</activity>
<meta-data android:name="com.example.myfbapp.ApplicationId" android:value="@string/app_id"/>
</application>
</manifest>
请帮帮我！ 这是错误Logcat：
01-12 17:34:35.478: D/dalvikvm(7010): GC_FOR_ALLOC freed 68K, 2% free 9090K/9196K, paused 23ms, total 23ms
01-12 17:34:35.518: I/dalvikvm-heap(7010): Grow heap (frag case) to 24.726MB for 16588816-byte allocation
01-12 17:34:35.538: D/dalvikvm(7010): GC_FOR_ALLOC freed 1K, 1% free 25289K/25400K, paused 18ms, total 18ms
01-12 17:34:35.808: I/TextToSpeech(7010): Sucessfully bound to com.google.android.tts
01-12 17:34:35.848: I/Adreno-EGL(7010): <qeglDrvAPI_eglInitialize:320>: EGL 1.4 QUALCOMM Build: I0404c4692afb8623f95c43aeb6d5e13ed4b30ddbDate: 11/06/13
01-12 17:34:35.878: D/OpenGLRenderer(7010): Enabling debug mode 0
01-12 17:34:38.381: D/AndroidRuntime(7010): Shutting down VM
01-12 17:34:38.381: W/dalvikvm(7010): threadid=1: thread exiting with uncaught exception (group=0x415ccba8)
01-12 17:34:38.381: E/AndroidRuntime(7010): FATAL EXCEPTION: main
01-12 17:34:38.381: E/AndroidRuntime(7010): Process: com.example.myfbapp, PID: 7010
01-12 17:34:38.381: E/AndroidRuntime(7010): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myfbapp/com.example.myfbapp.FBLoginActivity}: java.lang.NullPointerException: Argument 'applicationId' cannot be null
01-12 17:34:38.381: E/AndroidRuntime(7010): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
01-12 17:34:38.381: E/AndroidRuntime(7010): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
01-12 17:34:38.381: E/AndroidRuntime(7010): at android.app.ActivityThread.access$800(ActivityThread.java:135)
01-12 17:34:38.381: E/AndroidRuntime(7010): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
01-12 17:34:38.381: E/AndroidRuntime(7010): at android.os.Handler.dispatchMessage(Handler.java:102)
01-12 17:34:38.381: E/AndroidRuntime(7010): at android.os.Looper.loop(Looper.java:136)
01-12 17:34:38.381: E/AndroidRuntime(7010): at android.app.ActivityThread.main(ActivityThread.java:5017)
01-12 17:34:38.381: E/AndroidRuntime(7010): at java.lang.reflect.Method.invokeNative(Native Method)
01-12 17:34:38.381: E/AndroidRuntime(7010): at java.lang.reflect.Method.invoke(Method.java:515)
01-12 17:34:38.381: E/AndroidRuntime(7010): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
01-12 17:34:38.381: E/AndroidRuntime(7010): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
01-12 17:34:38.381: E/AndroidRuntime(7010): at dalvik.system.NativeStart.main(Native Method)
01-12 17:34:38.381: E/AndroidRuntime(7010): Caused by: java.lang.NullPointerException: Argument 'applicationId' cannot be null
01-12 17:34:38.381: E/AndroidRuntime(7010): at com.facebook.internal.Validate.notNull(Validate.java:29)
01-12 17:34:38.381: E/AndroidRuntime(7010): at com.facebook.Session.<init>(Session.java:227)
01-12 17:34:38.381: E/AndroidRuntime(7010): at com.facebook.Session.<init>(Session.java:212)
01-12 17:34:38.381: E/AndroidRuntime(7010): at com.facebook.UiLifecycleHelper.onCreate(UiLifecycleHelper.java:87)
01-12 17:34:38.381: E/AndroidRuntime(7010): at com.example.myfbapp.FBLoginActivity.onCreate(FBLoginActivity.java:48)
01-12 17:34:38.381: E/AndroidRuntime(7010): at android.app.Activity.performCreate(Activity.java:5231)
01-12 17:34:38.381: E/AndroidRuntime(7010): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
01-12 17:34:38.381: E/AndroidRuntime(7010): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
01-12 17:34:38.381: E/AndroidRuntime(7010): ... 11 more
01-12 17:34:40.713: I/Process(7010): Sending signal. PID: 7010 SIG: 9
希望这有帮助！
我不明白Scrumptious清单中的这段代码。我的清单中没有此代码。它是什么，是否需要？
<provider android:authorities="com.facebook.app.NativeAppCallContentProvider233936543368280"
android:name="com.facebook.NativeAppCallContentProvider" />
“233936543368280”是Scrumptious的应用程序。
答案 0 :(得分：1)
使用以下命令更改app id清单：
<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/app_id"/>