Facebook登录NullPointerException异常 [英] Facebook login NullPointerException

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本文介绍了Facebook登录NullPointerException异常的处理方法,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

想实现使用Facebook SDK(3.17.1)Facebook登录为Android,但我有一些问题,我还没有过去有。 首先,登录按钮不会呈现完全。这就是我得到

而不是此

(注意失踪Facebook的标志)。当我运行的应用程序,在一瞬间之前崩溃,显示它只是它应该的方式(与Facebook的标志)。

当应用程序崩溃,我得到这个错误信息

不幸的是,FacebookLoginTest为已停止

和这logcat的:

  08-12 22:19:08.751:E / AndroidRuntime(7731):致命异常:AsyncTask的#1
08-12 22:19:08.751:E / AndroidRuntime(7731):工艺:com.example.facebooklogintest,PID:7731
08-12 22:19:08.751:E / AndroidRuntime(7731):java.lang.RuntimeException的:一个错误而执行doInBackground发生()
08-12 22:19:08.751:E / AndroidRuntime(7731):在android.os.AsyncTask $ 3.done(AsyncTask.java:300)
08-12 22:19:08.751:E / AndroidRuntime(7731):在java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
08-12 22:19:08.751:E / AndroidRuntime(7731):在java.util.concurrent.FutureTask.setException(FutureTask.java:222)
08-12 22:19:08.751:E / AndroidRuntime(7731):在java.util.concurrent.FutureTask.run(FutureTask.java:242)
08-12 22:19:08.751:E / AndroidRuntime(7731):在android.os.AsyncTask $ SerialExecutor $ 1.运行(AsyncTask.java:231)
08-12 22:19:08.751:E / AndroidRuntime(7731):在java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
08-12 22:19:08.751:E / AndroidRuntime(7731):在java.util.concurrent.ThreadPoolExecutor中的$ Worker.run(ThreadPoolExecutor.java:587)
08-12 22:19:08.751:E / AndroidRuntime(7731):在java.lang.Thread.run(Thread.java:864)
08-12 22:19:08.751:E / AndroidRuntime(7731):由:显示java.lang.NullPointerException
08-12 22:19:08.751:E / AndroidRuntime(7731):在java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:911)
08-12 22:19:08.751:E / AndroidRuntime(7731):在com.facebook.internal.Utility.queryAppSettings(Utility.java:377)
08-12 22:19:08.751:E / AndroidRuntime(7731):在com.facebook.widget.LoginButton $ 1.doInBackground(LoginButton.java:677)
08-12 22:19:08.751:E / AndroidRuntime(7731):在com.facebook.widget.LoginButton $ 1.doInBackground(LoginButton.java:1)
08-12 22:19:08.751:E / AndroidRuntime(7731):在android.os.AsyncTask $ 2.call(AsyncTask.java:288)
08-12 22:19:08.751:E / AndroidRuntime(7731):在java.util.concurrent.FutureTask.run(FutureTask.java:237)
08-12 22:19:08.751:E / AndroidRuntime(7731):4 ...更多
08-12 22:19:10.753:D /过程(7731):killProcess,PID = 7731
08-12 22:19:10.753:D /过程(7731):com.android.internal.os.RuntimeInit $ UncaughtHandler.uncaughtException:131 java.lang.ThreadGroup.uncaughtException:693 java.lang.ThreadGroup.uncaughtException:690
 

我跟着指示添加Facebook登录到Android应用程序:

  1. 在进口的Facebook SDK
  2. 新增的Facebook工程为libray
  3. 新增的Facebook项目,为我的项目参考表
  4. 清洗,甚至重新启动该项目。

除了这些,我还没有在我的活动和明显的改变任何东西。 我已经在三个不同的Eclipse版本试过,都具有相同的错误,但后来我删除Facebook的登录按钮code在.xml文件,应用程序lauches就好了。 不知道还有什么我应该做的。 下面是MainActivity和Layout.xml codeS:

MainActivity.java

 包com.example.facebooklogintest;

进口android.support.v7.app.ActionBarActivity;
进口android.os.Bundle;
进口android.view.Menu;
进口android.view.MenuItem;


公共类MainActivity扩展ActionBarActivity {

@覆盖
保护无效的onCreate(包savedInstanceState){
    super.onCreate(savedInstanceState);
    的setContentView(R.layout.activity_main);
}


@覆盖
公共布尔onCreateOptionsMenu(功能菜单){
    //充气菜单;这增加了项目操作栏,如果它是present。
    。getMenuInflater()膨胀(R.menu.main,菜单);
    返回true;
}

@覆盖
公共布尔onOptionsItemSelected(菜单项项){
    //处理动作栏项目点击这里。将操作栏
    //自动在主/向上按钮操作的点击,只要
    //你在AndroidManifest.xml中指定一个父活动。
    INT的id = item.getItemId();
    如果(ID == R.id.action_settings){
        返回true;
    }
    返回super.onOptionsItemSelected(项目);
}
}
 

activity_main.xml

 < RelativeLayout的的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
的xmlns:工具=htt​​p://schemas.android.com/tool​​s
机器人:layout_width =match_parent
机器人:layout_height =match_parent
机器人:paddingBottom会=@扪/ activity_vertical_margin
机器人:以下属性来=@扪/ activity_horizo​​ntal_margin
机器人:paddingRight =@扪/ activity_horizo​​ntal_margin
机器人:paddingTop =@扪/ activity_vertical_margin
工具:上下文=com.example.facebooklogintest.MainActivity>



< com.facebook.widget.LoginButton
    机器人:ID =@ + ID / authButton
    机器人:layout_width =WRAP_CONTENT
    机器人:layout_height =WRAP_CONTENT
    机器人:layout_alignParentLeft =真
    机器人:layout_alignParentRight =真
    机器人:layout_gravity =center_horizo​​ntal
    机器人:layout_marginTop =30dp/>

 < / RelativeLayout的>
 

解决方案

您需要更改或在您的清单文件中添加此

 <活动
        机器人:名称=com.example.LoginActivity
        机器人:标签=@字符串/ APP_NAME
        机器人:parentActivityName =com.example.MainActivity>


 < /活性GT;
 <活动机器人:名称=com.facebook.LoginActivity
              机器人:主题=@安卓风格/ Theme.Translucent.NoTitleBar
              机器人:标签=@字符串/ APP_NAME/>
    <元数据的android:NAME =com.facebook.sdk.ApplicationId机器人:值=@字符串/ APP_ID/>
 

我不能把功劳这一点,所有的信用必须去谁张贴的答案的家伙<一href="http://stackoverflow.com/questions/23483262/android-facebook-login-widget-org-json-jsonexception">here我纯粹是增加了code,便于你和因为我也有被人谁$ P $告诉pviously删除的答案。

Am trying to implement the Facebook login for Android using the Facebook SDK (3.17.1) but i am having some issues i haven't had in the past. First of all, the login button doesn't render completely. This is what i get

instead of this:

(notice the missing Facebook logo). When I run the application, in the split second before it crashes it displays it just the way it should (with the Facebook logo).

When the application crashes, i get this error message

"Unfortunately, FacebookLoginTest as stopped"

and this in Logcat:

08-12 22:19:08.751: E/AndroidRuntime(7731): FATAL EXCEPTION: AsyncTask #1
08-12 22:19:08.751: E/AndroidRuntime(7731): Process: com.example.facebooklogintest,    PID: 7731
08-12 22:19:08.751: E/AndroidRuntime(7731): java.lang.RuntimeException: An error   occured while executing doInBackground()
08-12 22:19:08.751: E/AndroidRuntime(7731):     at     android.os.AsyncTask$3.done(AsyncTask.java:300)
08-12 22:19:08.751: E/AndroidRuntime(7731):     at  java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
08-12 22:19:08.751: E/AndroidRuntime(7731):     at  java.util.concurrent.FutureTask.setException(FutureTask.java:222)
08-12 22:19:08.751: E/AndroidRuntime(7731):     at java.util.concurrent.FutureTask.run(FutureTask.java:242)
08-12 22:19:08.751: E/AndroidRuntime(7731):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
08-12 22:19:08.751: E/AndroidRuntime(7731):     at   java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
08-12 22:19:08.751: E/AndroidRuntime(7731):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
08-12 22:19:08.751: E/AndroidRuntime(7731):     at  java.lang.Thread.run(Thread.java:864)
08-12 22:19:08.751: E/AndroidRuntime(7731): Caused by: java.lang.NullPointerException
08-12 22:19:08.751: E/AndroidRuntime(7731):     at   java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:911)
08-12 22:19:08.751: E/AndroidRuntime(7731):     at   com.facebook.internal.Utility.queryAppSettings(Utility.java:377)
08-12 22:19:08.751: E/AndroidRuntime(7731):     at com.facebook.widget.LoginButton$1.doInBackground(LoginButton.java:677)
08-12 22:19:08.751: E/AndroidRuntime(7731):     at com.facebook.widget.LoginButton$1.doInBackground(LoginButton.java:1)
08-12 22:19:08.751: E/AndroidRuntime(7731):     at android.os.AsyncTask$2.call(AsyncTask.java:288)
08-12 22:19:08.751: E/AndroidRuntime(7731):     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
08-12 22:19:08.751: E/AndroidRuntime(7731):     ... 4 more
08-12 22:19:10.753: D/Process(7731): killProcess, pid=7731
08-12 22:19:10.753: D/Process(7731):   com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException:131    java.lang.ThreadGroup.uncaughtException:693 java.lang.ThreadGroup.uncaughtException:690 

I followed the instructions for adding Facebook login to Android apps:

  1. Imported Facebook sdk
  2. Added Facebook project as libray
  3. Added Facebook project to list of references for my project
  4. Cleaned and even restarted the project.

Besides these, I haven't changed anything in my Activity and manifest. I have tried this in three different eclipse versions, all with the same error, but then i delete the Facebook login button code in the .xml file, the app lauches just fine. Not sure what else am supposed to do. Here are the MainActivity and Layout.xml codes:

MainActivity.java

package com.example.facebooklogintest;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;


public class MainActivity extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}
}

activity_main.xml

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.facebooklogintest.MainActivity" >



<com.facebook.widget.LoginButton
    android:id="@+id/authButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentRight="true"
    android:layout_gravity="center_horizontal"
    android:layout_marginTop="30dp" />

 </RelativeLayout>

解决方案

You need to change or add this in your manifest file

 <activity
        android:name="com.example.LoginActivity"
        android:label="@string/app_name" 
        android:parentActivityName="com.example.MainActivity" >


 </activity>
 <activity android:name="com.facebook.LoginActivity"
              android:theme="@android:style/Theme.Translucent.NoTitleBar"
              android:label="@string/app_name" />
    <meta-data android:name="com.facebook.sdk.ApplicationId"   android:value="@string/app_id"/>

I cannot take credit for this, all credit must go to the guy who posted the answer here I am purely adding the code for ease for you and because I got told to by someone who previously deleted the answer.

这篇关于Facebook登录NullPointerException异常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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