该应用程序在前一天工作正常,但是当我今天尝试启动它时它一直在崩溃。代码中没有发现错误。 这是下面的日志猫:
07-02 14:08:43.765: D/AndroidRuntime(16274): Shutting down VM 07-02 14:08:43.765: W/dalvikvm(16274): threadid=1: thread exiting with uncaught exception (group=0x41249930) 07-02 14:08:43.770: E/AndroidRuntime(16274): FATAL EXCEPTION: main 07-02 14:08:43.770: E/AndroidRuntime(16274): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.myexerciseplanner/com.example.myexerciseplanner.MainActivity}: java.lang.NullPointerException 07-02 14:08:43.770: E/AndroidRuntime(16274): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) 07-02 14:08:43.770: E/AndroidRuntime(16274): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2299) 07-02 14:08:43.770: E/AndroidRuntime(16274): at android.app.ActivityThread.access$700(ActivityThread.java:154) 07-02 14:08:43.770: E/AndroidRuntime(16274): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1284) 07-02 14:08:43.770: E/AndroidRuntime(16274): at android.os.Handler.dispatchMessage(Handler.java:99) 07-02 14:08:43.770: E/AndroidRuntime(16274): at android.os.Looper.loop(Looper.java:137) 07-02 14:08:43.770: E/AndroidRuntime(16274): at android.app.ActivityThread.main(ActivityThread.java:5306) 07-02 14:08:43.770: E/AndroidRuntime(16274): at java.lang.reflect.Method.invokeNative(Native Method) 07-02 14:08:43.770: E/AndroidRuntime(16274): at java.lang.reflect.Method.invoke(Method.java:511) 07-02 14:08:43.770: E/AndroidRuntime(16274): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102) 07-02 14:08:43.770: E/AndroidRuntime(16274): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869) 07-02 14:08:43.770: E/AndroidRuntime(16274): at dalvik.system.NativeStart.main(Native Method) 07-02 14:08:43.770: E/AndroidRuntime(16274): Caused by: java.lang.NullPointerException 07-02 14:08:43.770: E/AndroidRuntime(16274): at android.app.Activity.findViewById(Activity.java:1886) 07-02 14:08:43.770: E/AndroidRuntime(16274): at com.example.myexerciseplanner.MainActivity.(MainActivity.java:58) 07-02 14:08:43.770: E/AndroidRuntime(16274): at java.lang.Class.newInstanceImpl(Native Method) 07-02 14:08:43.770: E/AndroidRuntime(16274): at java.lang.Class.newInstance(Class.java:1319) 07-02 14:08:43.770: E/AndroidRuntime(16274): at android.app.Instrumentation.newActivity(Instrumentation.java:1071) 07-02 14:08:43.770: E/AndroidRuntime(16274): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2166) 07-02 14:08:43.770: E/AndroidRuntime(16274): ... 11 more
答案 0 :(得分:0)
我认为您在 setContentView 之前使用了 findViewById 。但是你需要发布你的代码。