Question

最近在做android开发，最后时候无法启动，有没有大神能帮我分析一下这个日志 我到底错在哪里

07-18 02:16:16.239: I/art(1383): Not late-enabling -Xcheck:jni (already on)
07-18 02:16:18.059: W/System(1383): ClassLoader referenced unknown path: /data/app/com.example.newmusic-2/lib/arm
07-18 02:16:18.210: D/AndroidRuntime(1383): Shutting down VM
07-18 02:16:18.210: D/AndroidRuntime(1383): --------- beginning of crash
07-18 02:16:18.215: E/AndroidRuntime(1383): FATAL EXCEPTION: main
07-18 02:16:18.215: E/AndroidRuntime(1383): Process: com.example.newmusic, PID: 1383
07-18 02:16:18.215: E/AndroidRuntime(1383): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.newmusic/com.example.newmusic.MainActivity}: java.lang.InstantiationException: java.lang.Class<com.example.newmusic.MainActivity> cannot be instantiated
07-18 02:16:18.215: E/AndroidRuntime(1383): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)
07-18 02:16:18.215: E/AndroidRuntime(1383): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
07-18 02:16:18.215: E/AndroidRuntime(1383): at android.app.ActivityThread.-wrap11(ActivityThread.java)
07-18 02:16:18.215: E/AndroidRuntime(1383): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
07-18 02:16:18.215: E/AndroidRuntime(1383): at android.os.Handler.dispatchMessage(Handler.java:102)
07-18 02:16:18.215: E/AndroidRuntime(1383): at android.os.Looper.loop(Looper.java:148)
07-18 02:16:18.215: E/AndroidRuntime(1383): at android.app.ActivityThread.main(ActivityThread.java:5417)
07-18 02:16:18.215: E/AndroidRuntime(1383): at java.lang.reflect.Method.invoke(Native Method)
07-18 02:16:18.215: E/AndroidRuntime(1383): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
07-18 02:16:18.215: E/AndroidRuntime(1383): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
07-18 02:16:18.215: E/AndroidRuntime(1383): Caused by: java.lang.InstantiationException: java.lang.Class<com.example.newmusic.MainActivity> cannot be instantiated
07-18 02:16:18.215: E/AndroidRuntime(1383): at java.lang.Class.newInstance(Native Method)
07-18 02:16:18.215: E/AndroidRuntime(1383): at android.app.Instrumentation.newActivity(Instrumentation.java:1067)
07-18 02:16:18.215: E/AndroidRuntime(1383): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2317)
07-18 02:16:18.215: E/AndroidRuntime(1383): ... 9 more

Answer 1

那些省电软件只是关掉运行的软件来省电。但有很多软件是自动后台启动，关了会自己打开，所以省电王没用，加上省电王要运行，自然更费电了。建议你下个lbe安全大师，获得权限，关闭不需要的软件自动启用。

Answer 2

MainActivity中有没有在子线程显示UI

追问

没有哦 这个是必须的步骤吗 刚接触这个

追答

不能在子线程显示UI，是写的demo吗，上MainActiviy这个类的代码

追问

代码超过了字数限制。。不知您方便不方便加一下我好友2908217603，我们私聊一下。多谢

追答

没问题

Answer 3

楼主解决了吗？我也遇到这个问题了