我想使用android工作室製作簡單的鬧鐘應用程序...我 認爲我的代碼是正確的,雖然它崩潰。我認爲問題是與 報警接收器和服務類....我有使用的if-else指定是否報警 是和鈴聲關閉或報警或鈴聲關閉,一些更.... 請幫助....感謝安卓鬧鐘應用程序崩潰
這裏是代碼:
會這樣做:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.lakshya.wakeywakey, PID: 2120
java.lang.RuntimeException: Unable to start service [email protected] with Intent { cmp=com.example.lakshya.wakeywakey/.RingtonePlayService (has extras) }: java.lang.NullPointerException: println needs a message
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2717)
at android.app.ActivityThread.access$2100(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1293)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5019)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException: println needs a message
at android.util.Log.println_native(Native Method)
at android.util.Log.e(Log.java:232)
at com.example.lakshya.wakeywakey.RingtonePlayService.onStartCommand(RingtonePlayService.java:37)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2700)
at android.app.ActivityThread.access$2100(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1293)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5019)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
添加堆棧跟蹤日誌,幾乎不可能說出什麼錯沒有它 – DEADMC
我已經通過添加日誌更新了我的問題.....但仍然沒有其他用戶的回覆......告訴我添加任何內容或刪除不必要的內容.. ......等待回覆...... – user7786905
那是因爲你的日誌不包含** Exception **。只是日誌顯示什麼都沒有,我們需要Exception stacktrace log。 – DEADMC