應用程序在共享首選項啓動時崩潰

由於某些未知原因，我的應用程序在啓動時立即崩潰。如果我在開始時刪除SharedPreferences .....部分，那麼它是可以的，所以問題必須與SharedPreferences有關！當我第一次使用它時，如果以前沒有創建文件，是不是創建的文件？應用程序在共享首選項啓動時崩潰

什麼可能是錯的？

String filename = "taggedImages"; 
SharedPreferences tagInfo = getSharedPreferences(filename, 0); 



public void tagImage(String imagePath, String contactId){ 
    //Toast.makeText(Activity_1.this, "" + imagePath + " " + contactId, Toast.LENGTH_LONG).show(); 

    // Write to file 
    SharedPreferences.Editor editor = tagInfo.edit(); 
    editor.putString(imagePath, contactId); 
    editor.commit(); 

    // Disable the menu item "Tagged in this image" 
    showMenuItem1 = false; 
}

的logcat：

02-27 13:37:48.156: D/AndroidRuntime(27311): Shutting down VM 
02-27 13:37:48.156: W/dalvikvm(27311): threadid=1: thread exiting with uncaught exception (group=0x40018578) 
02-27 13:37:48.164: E/AndroidRuntime(27311): FATAL EXCEPTION: main 
02-27 13:37:48.164: E/AndroidRuntime(27311): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{se.com.test.assignment.two/se.com.test.assignment.two.Activity_1}: java.lang.NullPointerException 
02-27 13:37:48.164: E/AndroidRuntime(27311): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at android.os.Handler.dispatchMessage(Handler.java:99) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at android.os.Looper.loop(Looper.java:130) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at android.app.ActivityThread.main(ActivityThread.java:3687) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at java.lang.reflect.Method.invokeNative(Native Method) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at java.lang.reflect.Method.invoke(Method.java:507) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at dalvik.system.NativeStart.main(Native Method) 
02-27 13:37:48.164: E/AndroidRuntime(27311): Caused by: java.lang.NullPointerException 
02-27 13:37:48.164: E/AndroidRuntime(27311): at android.content.ContextWrapper.getSharedPreferences(ContextWrapper.java:146) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at se.com.test.assignment.two.Activity_1.<init>(Activity_1.java:27) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at java.lang.Class.newInstanceImpl(Native Method) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at java.lang.Class.newInstance(Class.java:1409) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 
02-27 13:37:48.164: E/AndroidRuntime(27311): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1565) 
02-27 13:37:48.164: E/AndroidRuntime(27311): ... 11 more 
02-27 13:40:19.492: I/ApplicationPackageManager(27449): cscCountry is not German : NEE 
02-27 13:40:21.679: I/ApplicationPackageManager(27449): cscCountry is not German : NEE 
02-27 13:40:21.984: D/dalvikvm(27449): GC_EXTERNAL_ALLOC freed 64K, 48% free 2843K/5379K, external 514K/517K, paused 40ms 
02-27 13:40:22.125: D/dalvikvm(27449): GC_EXTERNAL_ALLOC freed 166K, 48% free 2846K/5447K, external 1100K/1144K, paused 38ms 
02-27 13:46:45.820: D/AndroidRuntime(27748): Shutting down VM 
02-27 13:46:45.820: W/dalvikvm(27748): threadid=1: thread exiting with uncaught exception (group=0x40018578) 
02-27 13:46:45.843: E/AndroidRuntime(27748): FATAL EXCEPTION: main 
02-27 13:46:45.843: E/AndroidRuntime(27748): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{se.com.test.assignment.two/se.com.test.assignment.two.Activity_1}: java.lang.NullPointerException 
02-27 13:46:45.843: E/AndroidRuntime(27748): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at android.os.Handler.dispatchMessage(Handler.java:99) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at android.os.Looper.loop(Looper.java:130) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at android.app.ActivityThread.main(ActivityThread.java:3687) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at java.lang.reflect.Method.invokeNative(Native Method) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at java.lang.reflect.Method.invoke(Method.java:507) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at dalvik.system.NativeStart.main(Native Method) 
02-27 13:46:45.843: E/AndroidRuntime(27748): Caused by: java.lang.NullPointerException 
02-27 13:46:45.843: E/AndroidRuntime(27748): at android.content.ContextWrapper.getSharedPreferences(ContextWrapper.java:146) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at se.com.test.assignment.two.Activity_1.<init>(Activity_1.java:27) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at java.lang.Class.newInstanceImpl(Native Method) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at java.lang.Class.newInstance(Class.java:1409) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 
02-27 13:46:45.843: E/AndroidRuntime(27748): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1565) 
02-27 13:46:45.843: E/AndroidRuntime(27748): ... 11 more

來源

2013-02-27 3D-kreativ

您的LogCat打印什麼？ – Ahmad 2013-02-27 12:48:52

很多信息！？我應該尋找什麼？ – 2013-02-27 12:49:47

發佈您的logcat異常 – Ajit 2013-02-27 12:49:51

我認爲你是太早打電話

SharedPreferences tagInfo = getSharedPreferences(filename, 0);

。在您的課程中聲明tagInfo並將其初始化爲您的活動的onCreate：

SharedPreferences tagInfo; //declaration in your class 
... 
@Override 
onCreate(...){ 
    ... 
    tagInfo = getSharedPreferences(filename, 0); 
}

來源

2013-02-27 12:52:34 mihail

Aha！你的意思是SharedPreferences tagInfo;在類的開始，然後在onCreate寫入：tagInfo = getSharedPreferences（filename，0）; ?? – 2013-02-27 12:56:23

應用程序在共享首選項啓動時崩潰

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