在启动适配器时在getapplicationContext（）处发生Java.lang.NullPointerException

在Android模拟器上运行项目时，我在getApplicationContext处遇到java.lang.NullPointerException的异常。请帮助我解决此问题。在启动适配器时在getapplicationContext（）处发生Java.lang.NullPointerException

错误

07-19 15:08:07.811: D/AndroidRuntime(366): Shutting down VM 
07-19 15:08:07.811: W/dalvikvm(366): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 
07-19 15:08:07.841: E/AndroidRuntime(366): FATAL EXCEPTION: main 
07-19 15:08:07.841: E/AndroidRuntime(366): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{org.TfsMutualFund/org.TfsMutualFund.loading}: java.lang.NullPointerException 
07-19 15:08:07.841: E/AndroidRuntime(366): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585) 
07-19 15:08:07.841: E/AndroidRuntime(366): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 

07-19 15:08:07.841: E/AndroidRuntime(366): Caused by: java.lang.NullPointerException 
07-19 15:08:07.841: E/AndroidRuntime(366): at android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:100) 
07-19 15:08:07.841: E/AndroidRuntime(366): at org.TfsMutualFund.loading.<init>(loading.java:23)

的AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="org.TfsMutualFund"> 
<uses-sdk android:targetSdkVersion="8" /> 

<application android:name=".globalAdapter" android:icon="@drawable/icon" android:label="@string/app_name"> 

    <activity android:name=".loading" 
       android:label="@string/app_name" 
       android:theme="@android:style/Theme.NoTitleBar" 
       android:configChanges="orientation|keyboard|keyboardHidden"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 
      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
    <activity android:name=".TFSManinActivity" 
    android:configChanges="orientation|keyboard|keyboardHidden"/> 
</application>

loading.java

package org.TfsMutualFund; 

public class loading extends Activity{ 
private static ArrayAdapter<String> adapter; 
private globalAdapter adpt = ((globalAdapter)getApplicationContext()); 
private String ServicePath = adpt.getServicePath(); 
private String ServiceName = adpt.getServiceName(); 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.loading); 
if(isOnline()) 
    new AsyncLoad().execute(); 
else

来源

2012-07-19 Mahavir

您可以使用“this”而不是在您的加载活动中调用getApplicationContext（） – pixelscreen 2012-07-19 09:52:01

不要发布所有内容，只要在发生错误的地方发布代码块！ – 2012-07-19 09:52:05

并且在onCreate（）中做这些初始化，而不是在那之前！ – pixelscreen 2012-07-19 09:55:19

不要在OnCreate()之前初始化它，你不能在那里获得Context，在onCreate()。

private globalAdapter adpt; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.loading); 
    adpt = ((globalAdapter)getApplicationContext()); 
    ... 
}

来源

2012-07-19 09:53:53

反对票的理由是什么？ – 2012-07-19 09:58:50

谢谢拉利特。但是，在OnCreate方法中初始化它后，它显示相同的错误。 – Mahavir 2012-07-19 10:21:56

您是否删除了'private globalAdapter adpt =（（globalAdapter）getApplicationContext（））;'作为全局的？ – 2012-07-19 10:24:48

不要在之前的onCreate初始化下面，就让意见得到他们的IDS第一

private globalAdapter adpt = ((globalAdapter)getApplicationContext()); 
private String ServicePath = adpt.getServicePath(); 
private String ServiceName = adpt.getServiceName();

2.只是声明他们....

private globalAdapter adpt; 
private String ServicePath; 
private String ServiceName;

3.因为当活动没有形成时，你怎么能得到Con文本添加到该活动，导致您正在使用getApplicationContext()获取当前活动上下文。

来源

2012-07-19 10:04:24

谢谢Xitij，但即使在Oncreate（）方法初始化它后，它显示相同的错误.. – Mahavir 2012-07-19 10:20:55

在启动适配器时在getapplicationContext（）处发生Java.lang.NullPointerException

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