Question

我的android应用程序每次在模拟器和真实设备上运行/启动时都会崩溃，并返回以下错误消息：Unfortunately "application_name" has stopped! 这就是我的logcat的样子：

08-05 22:34:24.452: D/dalvikvm(541): Not late-enabling CheckJNI (already on)
08-05 22:34:25.012: D/AndroidRuntime(541): Shutting down VM
08-05 22:34:25.012: W/dalvikvm(541): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
08-05 22:34:25.012: E/AndroidRuntime(541): FATAL EXCEPTION: main
08-05 22:34:25.012: E/AndroidRuntime(541): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.tutorial.sharedpreferences/com.tutorial.sharedpreferences.Main}: java.lang.NullPointerException
08-05 22:34:25.012: E/AndroidRuntime(541):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1879)
08-05 22:34:25.012: E/AndroidRuntime(541):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
08-05 22:34:25.012: E/AndroidRuntime(541):  at android.app.ActivityThread.access$600(ActivityThread.java:122)
08-05 22:34:25.012: E/AndroidRuntime(541):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
08-05 22:34:25.012: E/AndroidRuntime(541):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-05 22:34:25.012: E/AndroidRuntime(541):  at android.os.Looper.loop(Looper.java:137)
08-05 22:34:25.012: E/AndroidRuntime(541):  at android.app.ActivityThread.main(ActivityThread.java:4340)
08-05 22:34:25.012: E/AndroidRuntime(541):  at java.lang.reflect.Method.invokeNative(Native Method)
08-05 22:34:25.012: E/AndroidRuntime(541):  at java.lang.reflect.Method.invoke(Method.java:511)
08-05 22:34:25.012: E/AndroidRuntime(541):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
08-05 22:34:25.012: E/AndroidRuntime(541):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
08-05 22:34:25.012: E/AndroidRuntime(541):  at dalvik.system.NativeStart.main(Native Method)
08-05 22:34:25.012: E/AndroidRuntime(541): Caused by: java.lang.NullPointerException
08-05 22:34:25.012: E/AndroidRuntime(541):  at android.content.ContextWrapper.getSharedPreferences(ContextWrapper.java:153)
08-05 22:34:25.012: E/AndroidRuntime(541):  at com.tutorial.sharedpreferences.Main.<init>(Main.java:13)
08-05 22:34:25.012: E/AndroidRuntime(541):  at java.lang.Class.newInstanceImpl(Native Method)
08-05 22:34:25.012: E/AndroidRuntime(541):  at java.lang.Class.newInstance(Class.java:1319)
08-05 22:34:25.012: E/AndroidRuntime(541):  at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
08-05 22:34:25.012: E/AndroidRuntime(541):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1870)
08-05 22:34:25.012: E/AndroidRuntime(541):  ... 11 more

Answer 1

您正尝试从初始化程序中调用getSharedPreferences()。在调用Activity之前，您无法安全地调用从super.onCreate()继承的方法。

Android应用程序在启动时崩溃

1 个答案: