开始通过意向的活动时,NullPointerException异常 [英] NullPointerException when starting an activity through intent
问题描述
我有以下code,我修整开始给予一定的条件下一项活动是真实的。但在 startActivity(controllerActivity);
我收到显示java.lang.NullPointerException
在舞台上的 controllerActivity
变量包含意向{行为= android.intent.action.Main} $ C $的有效值C>
发thr_authenticateUser =新主题(新的Runnable(){
@覆盖
公共无效的run(){
...
布尔_authenticationStatus =通过Boolean.valueOf(authenticationReplyValue);
如果(_authenticationStatus){
意图controllerActivity =新的意向书(android.intent.action.Main);
startActivity(controllerActivity); //空指针异常
}
}
});
thr_authenticateUser.start();
在进一步的调查结果我发现,它是失败的确切地点是内部主要活动的`的onCreate()
保护无效的onCreate(最终捆绑savedInstanceState){
super.onCreate(savedInstanceState);
。getWindow()requestFeature(Window.FEATURE_ACTION_BAR);
的setContentView(R.layout.main_view); //这里:显示java.lang.NullPointerException
不过视图名称 main_view
是正确的,它的存在。
清单:
<活动
机器人:主名称=
机器人:标签=@字符串/ APP_NAME
机器人:launchMode =singleInstance
机器人:windowSoftInputMode =adjustPan>
<意向滤光器>
<作用机器人:名称=android.intent.action.Main/>
<类机器人:名称=android.intent.category.DEFAULT/>
&所述; /意图滤光器>
< /活性GT;
Compelte堆栈跟踪:
显示java.lang.NullPointerException
在android.app.Activity.startActivityForResult(Activity.java:3370)
在android.app.Activity.startActivityForResult(Activity.java:3331)
在android.app.Activity.startActivity(Activity.java:3566)
在android.app.Activity.startActivity(Activity.java:3534)
在com.citypulse.citypulse.User $ 1.运行(User.java:57)
在java.lang.Thread.run(Thread.java:856)
获取的背景下,开始你的活动
getBaseContext()startActivity(controlledActivity)。
或
YourActivity.this.startActivity(controlledActivity);
I have following code, I am truing to start an activity given certain condition is true. But over startActivity(controllerActivity);
I am getting java.lang.NullPointerException
The controllerActivity
variable at the stage contains a valid value of Intent { act=android.intent.action.Main }
Thread thr_authenticateUser = new Thread(new Runnable() {
@Override
public void run() {
…
Boolean _authenticationStatus = Boolean.valueOf(authenticationReplyValue);
if (_authenticationStatus) {
Intent controllerActivity = new Intent("android.intent.action.Main");
startActivity(controllerActivity); //NullPointerException
}
}
});
thr_authenticateUser.start();
Over further findings I found out that the exact place where it is failing is inside Main activitY’s `onCreate()
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
setContentView(R.layout.main_view); // HERE: java.lang.NullPointerException
However the view name main_view
is correct and it exists.
Manifest:
<activity
android:name=".Main"
android:label="@string/app_name"
android:launchMode="singleInstance"
android:windowSoftInputMode="adjustPan" >
<intent-filter>
<action android:name="android.intent.action.Main" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
Compelte stack trace:
java.lang.NullPointerException
at android.app.Activity.startActivityForResult(Activity.java:3370)
at android.app.Activity.startActivityForResult(Activity.java:3331)
at android.app.Activity.startActivity(Activity.java:3566)
at android.app.Activity.startActivity(Activity.java:3534)
at com.citypulse.citypulse.User$1.run(User.java:57)
at java.lang.Thread.run(Thread.java:856)
Get the context to start your activity
getBaseContext().startActivity(controlledActivity);
or
YourActivity.this.startActivity(controlledActivity);
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