Facebook的Android SDK中的applicationID造成NPE [英] Facebook Android SDK applicationId causing NPE
本文介绍了Facebook的Android SDK中的applicationID造成NPE的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我一直在试图让一个Facebook登录（沿着G +登录）在我的应用程序工作。 G +做工精细，现在我已经决定要加入Facebook的整合。
我从Facebook的应用程序ID，并提供了在清单像这样：
＆LT;元数据
机器人：名字=com.facebook.skd.ApplicationId
机器人：值=@字符串/ APP_ID/＆GT;
下面是字符串资源：
＆LT;字符串名称=APP_ID＆GT;＆0000000000000000 LT; /串＆GT;
这是我的登录活动code，对相应的信息审查。我不明白为什么会出现在Facebook的部分 Session.openActiveSession 行的NullPointerException异常，指出争论的applicationID不能为空。的这个链接会为您提供LogCat中的信息，我感到非常新的Android开发，更新与Facebook合作，仅供参考
包com.example.example;进口android.app.Activity;
进口android.app.AlertDialog;
进口android.app.ProgressDialog;
进口android.content.DialogInterface;
进口android.content.Intent;
进口android.content.IntentSender.SendIntentException;
进口android.content.Shared preferences;
进口android.os.Bundle;
进口android.util.Log;
进口android.view.View;
进口android.view.WindowManager;进口com.facebook.Request;
进口com.facebook.Response;
进口com.facebook.Session;
进口com.facebook.SessionState;
进口com.facebook.android.Facebook;
进口com.facebook.model.GraphUser;
进口com.facebook.widget.LoginButton;
进口com.google.android.gms.common.ConnectionResult;
进口com.google.android.gms.common.GooglePlayServicesClient.ConnectionCallbacks;
进口com.google.android.gms.common.GooglePlayServicesClient.OnConnectionFailedListener;
进口com.google.android.gms.common.SignInButton;
进口com.google.android.gms.plus.PlusClient;
进口com.google.android.gms.plus.model.people.Person;
公共类LoginActivity扩展活动实现View.OnClickListener，ConnectionCallbacks，OnConnectionFailedListener {公共静态最后弦乐preFS_NAME =我的prefsFile
公共静态布尔mFirstTimeUsingApp = TRUE;
私有静态最后弦乐TAG = LoginActivity.class.getSimpleName（）;//谷歌加成员变量
受保护的静态最终诠释REQUEST_ code_RESOLVE_ERR = 9000;
保护PlusClient mPlusClient;
保护ConnectionResult mPlusConnectionResult;
保护ProgressDialog mPlusConnectionProgressDialog;
保护INT SIZE_WIDE = 1;// Facebook的成员变量
私有静态最后弦乐APP_ID =0000000000000000;
私人facebook mFacebook;
私人ProgressDialog mFacebookProgress;
@燮pressWarnings（德precation）
@覆盖
保护无效的onCreate（捆绑savedInstanceState）{ super.onCreate（savedInstanceState）; 共享preferences mShared preferences = getShared preferences（preFS_NAME，0）;
布尔firstTimeUsingapp = mShared preferences.getBoolean（firstTimeUsingApp，真正的）;
mPlusClient =新PlusClient.Builder（这，这，这）.setVisibleActivities（http://schemas.google.com/AddActivity）.build（）; 如果（firstTimeUsingapp ==真）{ 的setContentView（R.layout.activity_login）;
。this.getWindow（）setSoftInputMode（WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN）;/ * * ------------------------------------- /
/ * ----------谷歌加登录---------- * /
/ * * ------------------------------------- / SignInButton btnSignInGooglePlus =（SignInButton）findViewById（R.id.google_plus_sign_in_button）;
btnSignInGooglePlus.setSize（SIZE_WIDE）; findViewById（R.id.google_plus_sign_in_button）.setOnClickListener（本）;
//按钮btnSignOutGooglePlus =（按钮）findViewById（R.id.sign_out）;
Log.v（TAG，5）; Log.v（TAG，6）; // mPlusClient =新PlusClient.Builder（这，这，这）.setVisibleActivities（http://schemas.google.com/AddActivity）.build（）; 如果连接故障未解决，显示//进度条。
mPlusConnectionProgressDialog =新ProgressDialog（本）;
mPlusConnectionProgressDialog.setMessage（登录...）;/ * * ------------------------------------- /
/* - - - - - -Facebook登入 - - - - - - */
/ * * ------------------------------------- / mFacebookProgress =新ProgressDialog（本）; LoginButton mFacebookButton =（LoginButton）findViewById（R.id.facebook_sign_in_button）; Session.openActiveSession（这一点，真正的，新的Session.StatusCallback（）{ @覆盖
公共无效呼叫（会话的会话，SessionState会状态，异常除外）{
如果（session.isOpened（））{
Request.executeMeRequestAsync（会话，新Request.GraphUserCallback（）{ @覆盖
公共无效onCompleted（GraphUser用户，响应响应）{
意向意图=新意图（LoginActivity.this，MainActivity.class）;
startActivity（意向）;
}
}）;
}
}
}）;/ * * ------------------------------------- /
/ * ------------微博登录------------ * /
/ * * ------------------------------------- /
//去做/ * * ------------------------------------- /
/ * ----------网站账户登录--------- * /
/ * * ------------------------------------- /
//去做
}
其他{
的setContentView（R.layout.activity_login_pending）;
Log.v（TAG，99）;
}}@覆盖
保护无效调用onStart（）{
Log.v（TAG，在onStart称为）;
super.onStart（）;
Log.v（TAGsuper.onStart称为）;
如果（mPlusClient.isConnected（）==假）{
mPlusClient.connect（）;
}
Log.v（TAGmPlusClient连接）;
}@覆盖
保护无效的onStop（）{
super.onStop（）;
mPlusClient.disconnect（）;
}
@覆盖
公共无效onConnectionFailed（ConnectionResult结果）{
如果（mPlusConnectionProgressDialog.isShowing（））{ 如果（result.hasResolution（））{
尝试{
result.startResolutionForResult（这一点，REQUEST_ code_RESOLVE_ERR）;
}赶上（SendIntentException E）{
mPlusClient.connect（）;
}
}
} mPlusConnectionResult =结果;
}@覆盖
公共无效onConnected（捆绑为arg0）{
如果（mPlusConnectionProgressDialog！= NULL）{
如果（mPlusConnectionProgressDialog.isShowing（）==真）{
mPlusConnectionProgressDialog.dismiss（）;
}
} 人人= mPlusClient.getCurrentPerson（）; 字符串userid = person.getId（）; 共享preferences共享preferences = getShared preferences（preFS_NAME，0）;
共享preferences.Editor编辑=共享preferences.edit（）; editor.putString（用户ID，用户ID）;
editor.commit（）; 意向意图=新意图（LoginActivity.this，MainActivity.class）;
startActivity（意向）; 完（）;
}@覆盖
公共无效onDisconnected（）{
}@覆盖
保护无效的onActivityResult（INT申请code，INT响应code，意图意图）{
如果（要求code == REQUEST_ code_RESOLVE_ERR＆放大器;＆安培;响应code == RESULT_OK）{
mPlusConnectionResult = NULL;
mPlusClient.connect（）;
}
}@覆盖
公共无效的onClick（查看视图）{
如果（view.getId（）== R.id.google_plus_sign_in_button＆放大器;＆放大器;！mPlusClient.isConnected（））{
如果（mPlusConnectionResult == NULL）{
mPlusConnectionProgressDialog.show（）;
}其他{
尝试{
mPlusConnectionResult.startResolutionForResult（这一点，REQUEST_ code_RESOLVE_ERR）;
}赶上（SendIntentException E）{
//尝试重新连接。
mPlusConnectionResult = NULL;
mPlusClient.connect（）;
mPlusClient.disconnect（）;
}
}
}否则如果（view.getId（）== R.id.facebook_sign_in_button）/ *＆放大器;＆放大器;不知道到这里TODO * / { }}保护无效errorLogin（）{
AlertDialog.Builder建设者=新AlertDialog.Builder（本）;
builder.setTitle（R.string.error_login_title）;
builder.setMessage（R.string.error_login_message）;
builder.setPositiveButton（android.R.string.ok，新DialogInterface.OnClickListener（）{ @覆盖
公共无效的onClick（DialogInterface对话，诠释它）{
dialog.dismiss（）; }
}）;
AlertDialog对话框= builder.create（）;
dialog.show（）;
}}
解决方案
而不是使用的登录/注销目的的普通按钮，你可以使用Facebook SDK自己的登录/注销的Widget。您可以在下面的链接实现的细节：
<一href=\"http://stackoverflow.com/questions/17683338/post-to-facebook-after-login-fails-android/17684571#17684571\">Post登录后Facebook的失败的Android
编辑：的
初始化后， mFacebookButton ，设置这些权限：
mFacebookButton.setPublishPermissions（Arrays.asList（publish_stream，read_stream））;
使用下面的code正确设置权限了。
mFacebookButton.setSessionStatusCallback（新Session.StatusCallback（）
{
公共无效呼叫（会话的会话，SessionState会状态，异常除外）
{
// TODO自动生成方法存根
如果（session.isOpened（））
{
Log.i（TAG，访问令牌+ session.getAccessToken（））;
Request.executeMeRequestAsync（会话，新Request.GraphUserCallback（）{公共无效onCompleted（GraphUser用户，响应响应）
{
// TODO自动生成方法存根
如果（用户！= NULL）
{
Log.i（TAG，用户ID+ user.getId（））;
Log.i（TAG，电子邮件+ user.asMap（）获得（电子邮件））;
}
}}）;
}
其他
{
//当被点击注销该else条件将被执行。
}
}
}）;
相反这code的：
Session.openActiveSession（这一点，真正的，新的Session.StatusCallback（）{
@覆盖
公共无效呼叫（会话的会话，SessionState会状态，异常除外）{
如果（session.isOpened（））{
Request.executeMeRequestAsync（会话，新Request.GraphUserCallback（）{ @覆盖
公共无效onCompleted（GraphUser用户，响应响应）{
意向意图=新意图（LoginActivity.this，MainActivity.class）;
startActivity（意向）;
}
}）;
}
}
}）;
我希望这有助于。
I have been trying to get a Facebook Login (alongside G+ log in) working on my app. G+ works fine, and now I've decided to add Facebook integration.
I have the app ID from facebook, and have provided that in the manifest as so:
<meta-data
android:name="com.facebook.skd.ApplicationId"
android:value="@string/app_id" />
Here is the string resource:
<string name="app_id">000000000000000</string>
And here is my login activity code, with censors on the appropriate information. I do not understand why there is an NullPointerException on the Session.openActiveSessionline in the Facebook section, stating that "Argument 'applicationId' cannot be null. This link will provide you with the LogCat info. I am extremely new to Android development and even more new to working with Facebook, just FYI.
package com.example.example;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentSender.SendIntentException;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.WindowManager;
import com.facebook.Request;
import com.facebook.Response;
import com.facebook.Session;
import com.facebook.SessionState;
import com.facebook.android.Facebook;
import com.facebook.model.GraphUser;
import com.facebook.widget.LoginButton;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient.ConnectionCallbacks;
import com.google.android.gms.common.GooglePlayServicesClient.OnConnectionFailedListener;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.plus.PlusClient;
import com.google.android.gms.plus.model.people.Person;
public class LoginActivity extends Activity implements View.OnClickListener, ConnectionCallbacks, OnConnectionFailedListener{
public static final String PREFS_NAME = "MyPrefsFile";
public static Boolean mFirstTimeUsingApp = true;
private static final String TAG = LoginActivity.class.getSimpleName();
//Google Plus Member Variables
protected static final int REQUEST_CODE_RESOLVE_ERR = 9000;
protected PlusClient mPlusClient;
protected ConnectionResult mPlusConnectionResult;
protected ProgressDialog mPlusConnectionProgressDialog;
protected int SIZE_WIDE = 1;
//Facebook Member Variables
private static final String APP_ID = "000000000000000";
private Facebook mFacebook;
private ProgressDialog mFacebookProgress;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SharedPreferences mSharedPreferences = getSharedPreferences(PREFS_NAME, 0);
boolean firstTimeUsingapp = mSharedPreferences.getBoolean("firstTimeUsingApp", true);
mPlusClient = new PlusClient.Builder(this, this, this).setVisibleActivities("http://schemas.google.com/AddActivity").build();
if (firstTimeUsingapp == true) {
setContentView(R.layout.activity_login);
this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
/*-------------------------------------*/
/*----------Google Plus Login----------*/
/*-------------------------------------*/
SignInButton btnSignInGooglePlus = (SignInButton) findViewById(R.id.google_plus_sign_in_button);
btnSignInGooglePlus.setSize(SIZE_WIDE);
findViewById(R.id.google_plus_sign_in_button).setOnClickListener(this);
//Button btnSignOutGooglePlus = (Button) findViewById(R.id.sign_out);
Log.v(TAG, "5");
Log.v(TAG, "6");
//mPlusClient = new PlusClient.Builder(this, this, this).setVisibleActivities("http://schemas.google.com/AddActivity").build();
//Progress bar to be displayed if the connection failure is not resolved.
mPlusConnectionProgressDialog = new ProgressDialog(this);
mPlusConnectionProgressDialog.setMessage("Signing in...");
/*-------------------------------------*/
/*-----------Facebook Login------------*/
/*-------------------------------------*/
mFacebookProgress = new ProgressDialog(this);
LoginButton mFacebookButton = (LoginButton) findViewById(R.id.facebook_sign_in_button);
Session.openActiveSession(this, true, new Session.StatusCallback() {
@Override
public void call(Session session, SessionState state, Exception exception) {
if (session.isOpened()) {
Request.executeMeRequestAsync(session, new Request.GraphUserCallback() {
@Override
public void onCompleted(GraphUser user, Response response) {
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
startActivity(intent);
}
});
}
}
});
/*-------------------------------------*/
/*------------Twitter Login------------*/
/*-------------------------------------*/
//TODO
/*-------------------------------------*/
/*----------Site Account Login---------*/
/*-------------------------------------*/
//TODO
}
else {
setContentView(R.layout.activity_login_pending);
Log.v(TAG, "99");
}
}
@Override
protected void onStart() {
Log.v(TAG, "onStart called");
super.onStart();
Log.v(TAG, "super.onStart called");
if (mPlusClient.isConnected() == false) {
mPlusClient.connect();
}
Log.v(TAG, "mPlusClient connected");
}
@Override
protected void onStop() {
super.onStop();
mPlusClient.disconnect();
}
@Override
public void onConnectionFailed(ConnectionResult result) {
if(mPlusConnectionProgressDialog.isShowing()) {
if (result.hasResolution()) {
try {
result.startResolutionForResult(this, REQUEST_CODE_RESOLVE_ERR);
} catch (SendIntentException e){
mPlusClient.connect();
}
}
}
mPlusConnectionResult = result;
}
@Override
public void onConnected(Bundle arg0) {
if (mPlusConnectionProgressDialog != null) {
if (mPlusConnectionProgressDialog.isShowing() == true) {
mPlusConnectionProgressDialog.dismiss();
}
}
Person person = mPlusClient.getCurrentPerson();
String userID = person.getId();
SharedPreferences sharedPreferences = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("userID", userID);
editor.commit();
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
startActivity(intent);
finish();
}
@Override
public void onDisconnected() {
}
@Override
protected void onActivityResult(int requestCode, int responseCode, Intent intent) {
if (requestCode == REQUEST_CODE_RESOLVE_ERR && responseCode == RESULT_OK) {
mPlusConnectionResult = null;
mPlusClient.connect();
}
}
@Override
public void onClick(View view) {
if (view.getId() == R.id.google_plus_sign_in_button && !mPlusClient.isConnected()) {
if (mPlusConnectionResult == null) {
mPlusConnectionProgressDialog.show();
} else {
try {
mPlusConnectionResult.startResolutionForResult(this, REQUEST_CODE_RESOLVE_ERR);
} catch (SendIntentException e) {
//Try connecting again.
mPlusConnectionResult = null;
mPlusClient.connect();
mPlusClient.disconnect();
}
}
} else if (view.getId() == R.id.facebook_sign_in_button) /* && not sure what goes here TODO*/ {
}
}
protected void errorLogin() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(R.string.error_login_title);
builder.setMessage(R.string.error_login_message);
builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}
}
解决方案
Instead of using a normal button for login/logout purposes, you can use Facebook SDK's own Login/Logout Widget. You can find the implementation details in the following link:
Post to facebook after login fails Android
EDIT:
After initializing the mFacebookButton, set these permissions:
mFacebookButton.setPublishPermissions(Arrays.asList("publish_stream","read_stream"));
Use the code below after setting the permissions correctly.
mFacebookButton.setSessionStatusCallback(new Session.StatusCallback()
{
public void call(Session session, SessionState state,Exception exception)
{
// TODO Auto-generated method stub
if (session.isOpened())
{
Log.i(TAG, "Access Token" + session.getAccessToken());
Request.executeMeRequestAsync(session,new Request.GraphUserCallback() {
public void onCompleted(GraphUser user,Response response)
{
// TODO Auto-generated method stub
if (user != null)
{
Log.i(TAG, "User ID " + user.getId());
Log.i(TAG,"Email "+ user.asMap().get("email"));
}
}});
}
else
{
//This else condition will be executed when logout will be clicked.
}
}
});
Instead of this code:
Session.openActiveSession(this, true, new Session.StatusCallback() {
@Override
public void call(Session session, SessionState state, Exception exception) {
if (session.isOpened()) {
Request.executeMeRequestAsync(session, new Request.GraphUserCallback() {
@Override
public void onCompleted(GraphUser user, Response response) {
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
startActivity(intent);
}
});
}
}
});
I hope this helps.
这篇关于Facebook的Android SDK中的applicationID造成NPE的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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