我正在Android中开发一个应用程序并且没有语法错误但是当我在我的设备上部署我的应用程序时它会给出以下logcat错误,请帮助我,如果有人可以进行我的colg项目
以下是logcat错误
12-01 01:52:10.310: E/Trace(7853): error opening trace file: No such file or directory (2)
12-01 01:52:10.310: D/ActivityThread(7853): setTargetHeapUtilization:0.75
12-01 01:52:10.310: D/ActivityThread(7853): setTargetHeapIdealFree:8388608
12-01 01:52:10.310: D/ActivityThread(7853): setTargetHeapConcurrentStart:2097152
12-01 01:52:10.380: W/dalvikvm(7853): Refusing to reopen boot DEX '/system/framework/hwframework.jar'
12-01 01:52:10.660: I/ActivityThread(7853): Pub com.aiou.fyp.provider: com.aiou.fyp.DataProvider
12-01 01:52:11.070: W/dalvikvm(7853): threadid=1: thread exiting with uncaught exception (group=0x42022438)
12-01 01:52:11.090: E/AndroidRuntime(7853): FATAL EXCEPTION: main
12-01 01:52:11.090: E/AndroidRuntime(7853): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.aiou.fyp/com.aiou.fyp.MainActivity}: java.lang.NullPointerException
12-01 01:52:11.090: E/AndroidRuntime(7853): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2077)
12-01 01:52:11.090: E/AndroidRuntime(7853): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2102)
12-01 01:52:11.090: E/AndroidRuntime(7853): at android.app.ActivityThread.access$600(ActivityThread.java:137)
12-01 01:52:11.090: E/AndroidRuntime(7853): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
12-01 01:52:11.090: E/AndroidRuntime(7853): at android.os.Handler.dispatchMessage(Handler.java:99)
12-01 01:52:11.090: E/AndroidRuntime(7853): at android.os.Looper.loop(Looper.java:137)
12-01 01:52:11.090: E/AndroidRuntime(7853): at android.app.ActivityThread.main(ActivityThread.java:4838)
12-01 01:52:11.090: E/AndroidRuntime(7853): at java.lang.reflect.Method.invokeNative(Native Method)
12-01 01:52:11.090: E/AndroidRuntime(7853): at java.lang.reflect.Method.invoke(Method.java:511)
12-01 01:52:11.090: E/AndroidRuntime(7853): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:874)
12-01 01:52:11.090: E/AndroidRuntime(7853): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641)
12-01 01:52:11.090: E/AndroidRuntime(7853): at dalvik.system.NativeStart.main(Native Method)
12-01 01:52:11.090: E/AndroidRuntime(7853): Caused by: java.lang.NullPointerException
12-01 01:52:11.090: E/AndroidRuntime(7853): at com.aiou.fyp.MainActivity.onCreate(MainActivity.java:53)
12-01 01:52:11.090: E/AndroidRuntime(7853): at android.app.Activity.performCreate(Activity.java:5010)
12-01 01:52:11.090: E/AndroidRuntime(7853): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
12-01 01:52:11.090: E/AndroidRuntime(7853): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2041)
12-01 01:52:11.090: E/AndroidRuntime(7853): ... 11 more
答案 0 :(得分:1)
这通常发生在你忘记给某个布局组件充气但你正试图在课堂上使用它时。