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Android：应用程序意外停止

2012-03-19 137 views
0

我是一个新手。我试图从一个字符串中的EditText中输入并在另一个edittext中显示它。应用程序在开始时工作正常，但是当我插入下面的代码时，我开始获取错误“应用程序意外停止”，并在错误后，当我删除此代码，我仍然得到同样的错误。我完全困惑。Android：应用程序意外停止

这里是我完整的类代码：

public class IOActivity extends Activity { 
/** Called when the activity is first created. */ 
Button button=(Button) findViewById(R.id.button1); 
EditText edtxt1=(EditText) findViewById(R.id.editText1); 
EditText edtxt2=(EditText) findViewById(R.id.editText2); 


@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
button.setOnClickListener(new View.OnClickListener() { 

    @Override 
    public void onClick(View arg0) { 
     // TODO Auto-generated method stub 
String a=edtxt1.getText().toString(); 
    edtxt2.setText(a); 
    } 
}); 


} 
}

我Android.Manifest.xml：

<?xml version="1.0" encoding="utf-8"?> 
    <manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.example.IO" 
    android:versionCode="1" 
    android:versionName="1.0"> 
    <uses-sdk android:minSdkVersion="9" /> 

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

    <activity android:name=".IOActivity" android:label="@string/app_name"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 
      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 

</application> 
</manifest>

我logcat中显示了以下错误：

03-19 18:30:17.938: ERROR/Zygote(32): setreuid() failed. errno: 2 

03-19 18:30:29.179: ERROR/Zygote(32): setreuid() failed. errno: 17 

03-19 18:30:30.868: ERROR/BatteryService(60): usbOnlinePath not found 

03-19 18:30:30.868: ERROR/BatteryService(60): batteryVoltagePath not found 

03-19 18:30:30.868: ERROR/BatteryService(60): batteryTemperaturePath not found 

03-19 18:30:30.888: ERROR/SurfaceFlinger(60): Couldn't open /sys/power/wait_for_fb_sleep or /sys/power/wait_for_fb_wake 

03-19 18:30:31.128: ERROR/SensorService(60): couldn't open device for module sensors (Invalid argument) 


03-19 18:30:40.158: ERROR/System(60): Failure starting core service 

03-19 18:30:40.158: ERROR/System(60): java.lang.SecurityException 


03-19 18:30:40.158: ERROR/System(60):  at android.os.BinderProxy.transact(Native Method) 

03-19 18:30:40.158: ERROR/System(60):  at android.os.ServiceManagerProxy.addService(ServiceManagerNative.java:146) 

03-19 18:30:40.158: ERROR/System(60):  at android.os.ServiceManager.addService(ServiceManager.java:72) 

03-19 18:30:40.158: ERROR/System(60):  at com.android.server.ServerThread.run(SystemServer.java:206) 

03-19 18:30:40.188: ERROR/EventHub(60): could not get driver version for /dev/input/mouse0, Not a typewriter 

03-19 18:30:40.188: ERROR/EventHub(60): could not get driver version for /dev/input/mice, Not a typewriter 

03-19 18:30:40.738: ERROR/SoundPool(60): error loading /system/media/audio/ui/Effect_Tick.ogg 

03-19 18:30:40.748: ERROR/SoundPool(60): error loading /system/media/audio/ui/KeypressStandard.ogg 

03-19 18:30:40.748: ERROR/SoundPool(60): error loading /system/media/audio/ui/KeypressSpacebar.ogg 

03-19 18:30:40.748: ERROR/SoundPool(60): error loading /system/media/audio/ui/KeypressDelete.ogg 

03-19 18:30:40.758: ERROR/SoundPool(60): error loading /system/media/audio/ui/KeypressReturn.ogg 

03-19 18:30:40.808: ERROR/UsbObserver(60): java.lang.NullPointerException 

03-19 18:30:40.808: ERROR/UsbObserver(60):  at 
com.android.server.UsbObserver.init(UsbObserver.java:131) 

03-19 18:30:40.808: ERROR/UsbObserver(60):  at com.android.server.UsbObserver.<init>(UsbObserver.java:65) 

03-19 18:30:40.808: ERROR/UsbObserver(60):  at com.android.server.ServerThread.run(SystemServer.java:402) 

03-19 18:30:41.748: ERROR/ThrottleService(60): Could not open GPS configuration file /etc/gps.conf 

03-19 18:30:41.998: ERROR/logwrapper(132): executing /system/bin/tc failed: No such file or directory 

03-19 18:30:42.070: ERROR/logwrapper(134): executing /system/bin/tc failed: No such file or directory 

03-19 18:30:42.118: ERROR/logwrapper(135): executing /system/bin/tc failed: No such file or directory 

03-19 18:31:06.573: ERROR/MediaProvider(257): Illegal update request: can't downgrade from 305 to 92. Did you forget to wipe data? 

03-19 18:31:06.823: ERROR/MediaScannerService(257): exception in MediaScanner.scan() 

03-19 18:31:06.823: ERROR/MediaScannerService(257): java.lang.IllegalArgumentException 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at com.android.providers.media.MediaProvider.updateDatabase(MediaProvider.java:379) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at com.android.providers.media.MediaProvider.access$200(MediaProvider.java:83) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at com.android.providers.media.MediaProvider$DatabaseHelper.onUpgrade(MediaProvider.java:201) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:132) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:187) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at com.android.providers.media.MediaProvider.query(MediaProvider.java:1290) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at android.content.ContentProvider$Transport.query(ContentProvider.java:187) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at android.media.MediaScanner.prescan(MediaScanner.java:911) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at android.media.MediaScanner.scanDirectories(MediaScanner.java:1184) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at com.android.providers.media.MediaScannerService.scan(MediaScannerService.java:111) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at com.android.providers.media.MediaScannerService.access$200(MediaScannerService.java:48) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at com.android.providers.media.MediaScannerService$ServiceHandler.handleMessage(MediaScannerSe 
rvice.java:267) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at android.os.Handler.dispatchMessage(Handler.java:99) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at android.os.Looper.loop(Looper.java:123) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at com.android.providers.media.MediaScannerService.run(MediaScannerService.java:188) 

03-19 18:31:06.823: ERROR/MediaScannerService(257):  at java.lang.Thread.run(Thread.java:1019) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332): FATAL EXCEPTION: main 

03-19 18:31:14.083: ERROR/AndroidRuntime(332): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.IO/com.example.IO.IOActivity}: java.lang.NullPointerException 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1544) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1638) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at android.app.ActivityThread.access$1500(ActivityThread.java:117) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at android.os.Handler.dispatchMessage(Handler.java:99) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at android.os.Looper.loop(Looper.java:123) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at android.app.ActivityThread.main(ActivityThread.java:3647) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at java.lang.reflect.Method.invokeNative(Native Method) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at java.lang.reflect.Method.invoke(Method.java:507) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at dalvik.system.NativeStart.main(Native Method) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332): Caused by: java.lang.NullPointerException 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at android.app.Activity.findViewById(Activity.java:1647) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at com.example.IO.IOActivity.<init>(IOActivity.java:14) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at java.lang.Class.newInstanceImpl(Native Method) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at java.lang.Class.newInstance(Class.java:1409) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1536) 

03-19 18:31:14.083: ERROR/AndroidRuntime(332):  ... 11 more

来源

2012-03-19 Mj1992

+0

向我们展示你的'onCreate（）' – 2012-03-19 14:10:54

+0

你能发布你的完整代码吗？既然你提到在删除你发布的代码后仍然存在错误，那么其他的东西一定会导致错误。 – androidnoob 2012-03-19 14:15:42

+0

看起来像一个模拟器的问题...我认为 – Urban 2012-03-19 14:17:07

回答

0

您想获得该按钮槽

Button myButton = (Button) findViewById(R.id.my_button);

你必须确保你做了的setContentView调用后

setContentView(R.layout.layoutcontainingbutton);

如此这般错误的，因为你正试图使一个呼叫findViewById在这些视图加载之前。

来源

2012-03-19 14:17:53 youri

+0

thnx很多youri.you是正确的。 – Mj1992 2012-03-19 14:33:50

1 
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.IO/com.example.IO.IOActivity}: java.lang.NullPointerException

有你忘记了在你的012中宣布这项活动？

来源

2012-03-19 13:50:21

+0

我看到了清单文件并有活动是这样宣布 – Mj1992 2012-03-19 13:57:25

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