Android 调试跟踪问题
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"); 和 Debug.stopMethodTracing(); ，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
在这里我想提一下，我在清单中添加了
I am testing my code in device and it is running fine. But as soon as I am adding Debug.startMethodTracing("PlaceLocator"); and Debug.stopMethodTracing(); , it is giving problem. As per log, problem is-
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
Here I like to mention that I have added <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> in the manifest so that system can write file in sd card. Where is the problem?
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你在模拟器上尝试这个吗？如果是这样，您可能需要使用外部存储来配置模拟器。
或者尝试登录 shell 'adb shell' 并尝试在 /sdcard/LineGraph.trace 中创建一个文件。
您可以
回显“某事”> /sdcard/LineGraph.trace
并查看文件是否已创建。
Are you trying this on emulator ? If so you may want to configure your emulator with external storage.
Or try loging into shell 'adb shell' and try to create a file in /sdcard/LineGraph.trace.
You can
echo "something" > /sdcard/LineGraph.trace
and see if the file is created.
根据 http://developer.android.com/guide/developing /debugging/debugging-tracing.html#knownissues，分析和线程存在已知问题。我发现如果我使用任何线程，我的应用程序就会崩溃。
According to http://developer.android.com/guide/developing/debugging/debugging-tracing.html#knownissues, there are known issues with profiling and threads. I found that if I use any threads, my application crashes.