q569321891 2015-12-15 08:11 采纳率: 20%
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已采纳

安卓：java.lang.NullPointerException:

logcat显示错误：
FATAL EXCEPTION: main
Process: org.droidplanner, PID: 21924
java.lang.RuntimeException: Unable to resume activity {org.droidplanner/org.droidplanner.android.activities.FlightActivity}: java.lang.NullPointerException: Attempt to read from field 'android.content.SharedPreferences org.droidplanner.android.utils.prefs.DroidPlannerPrefs.prefs' on a null object reference
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3019)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3050)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2425)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5294)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)

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  • bdmh 移动开发领域优质创作者 2015-12-15 08:17
    关注

    你用到SharedPreferences了，它访问了null对象，你打个断点，调试就清楚了

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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