我正在设备中测试我的代码,它运行良好。但是,一旦我添加Debug.startMethodTracing("PlaceLocator");
and Debug.stopMethodTracing();
,它就会出现问题。根据日志,问题是 -
03-25 17:39:43.124: INFO/dalvikvm(5971): TRACE STARTED: '/sdcard/LineGraph.trace' 8192KB
03-25 17:39:43.124: ERROR/dalvikvm(5971): Unable to open trace file '/sdcard/LineGraph.trace': Permission denied
03-25 17:39:43.124: DEBUG/dalvikvm(5971): +++ active profiler count now 0
03-25 17:39:43.124: DEBUG/AndroidRuntime(5971): Shutting down VM
03-25 17:39:43.124: WARN/dalvikvm(5971): threadid=3: thread exiting with uncaught exception (group=0x4001b170)
03-25 17:39:43.124: ERROR/AndroidRuntime(5971): Uncaught handler: thread main exiting due to uncaught exception
03-25 17:39:43.131: ERROR/AndroidRuntime(5971): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.placeLocator/com.android.placeLocator.PlaceLocator}: java.lang.RuntimeException: file open failed
这里我想提一下,我已经<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
在清单中添加了,以便系统可以在 sd 卡中写入文件。问题出在哪里?