无法打开跟踪文件 [英] unable to open trace file
问题描述
我想测试我的应用程序的性能。我已经开始用简单的应用程序，并尝试把traceview但其突然失败对我的Android手机以武力结束。请指导我如何设置我的code propley简单的Android应用程序来获取与跟踪视图手的污垢
I want to test the performance of my app . I have started it with simple application and try to put traceview but its suddenly fail on my android phone with force to close. Please guide me how can i set my code propley for simple android app to get hands dirt with Trace view
下面是code 包test.check;
Here is the code package test.check;
import android.app.Activity;
import android.os.Bundle;
import android.os.Debug;
public class tracev extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Debug.startMethodTracing("traceview");
setContentView(R.layout.main);
}
@Override
protected void onStop() {
Debug.stopMethodTracing();
super.onStop();
}
}
下面是清单文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="test.check"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="4" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".tracev"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
</manifest>
我还添加了
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
但它不工作。我认为，这条线在logcat中其becasue，但我不知道该如何处理它
but its not working . I think its becasue of this line in the logcat but i am not sure how to deal with it
05-20 23:39:43.913: ERROR/dalvikvm(11673): Unable to open trace file '/sdcard/traceview.trace': Permission denied
logcat的
Logcat
05-20 23:39:43.903: DEBUG/dalvikvm(11673): +++ active profiler count now 1
05-20 23:39:43.913: INFO/dalvikvm(11673): TRACE STARTED: '/sdcard/traceview.trace' 8192KB
05-20 23:39:43.913: ERROR/dalvikvm(11673): Unable to open trace file '/sdcard/traceview.trace': Permission denied
05-20 23:39:43.913: DEBUG/dalvikvm(11673): +++ active profiler count now 0
05-20 23:39:43.913: DEBUG/AndroidRuntime(11673): Shutting down VM
05-20 23:39:43.913: WARN/dalvikvm(11673): threadid=3: thread exiting with uncaught exception (group=0x4001e390)
05-20 23:39:43.913: ERROR/AndroidRuntime(11673): Uncaught handler: thread main exiting due to uncaught exception
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): java.lang.RuntimeException: Unable to start activity ComponentInfo{test.check/test.check.tracev}: java.lang.RuntimeException: file open failed
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2596)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2621)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at android.app.ActivityThread.access$2200(ActivityThread.java:126)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1932)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at android.os.Handler.dispatchMessage(Handler.java:99)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at android.os.Looper.loop(Looper.java:123)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at android.app.ActivityThread.main(ActivityThread.java:4595)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at java.lang.reflect.Method.invokeNative(Native Method)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at java.lang.reflect.Method.invoke(Method.java:521)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at dalvik.system.NativeStart.main(Native Method)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): Caused by: java.lang.RuntimeException: file open failed
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at dalvik.system.VMDebug.startMethodTracing(Native Method)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at dalvik.system.VMDebug.startMethodTracing(VMDebug.java:156)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at android.os.Debug.startMethodTracing(Debug.java:443)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at android.os.Debug.startMethodTracing(Debug.java:391)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at test.check.tracev.onCreate(tracev.java:12)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2544)
05-20 23:39:43.983: ERROR/AndroidRuntime(11673): ... 11 more
05-20 23:39:44.013: INFO/Process(94): Sending signal. PID: 11673 SIG: 3
05-20 23:39:44.013: INFO/dalvikvm(11673): threadid=7: reacting to signal 3
05-20 23:39:44.023: INFO/dalvikvm(11673): Wrote stack trace to '/data/anr/traces.txt'
05-20 23:39:51.213: DEBUG/KeyguardViewMediator(94): pokeWakelock(15000)
05-20 23:39:51.213: INFO/HtcLockScreen(94): Press Menu key to unlock screen
我想知道一点没有什么的SD卡，并在它前面的是没有选择的设备。可能也可以是错误的原因，这里是图片
I am wondering about one point there is nothing in the sdcard and in front of it there is no device selected . May be it can be the cause of error , here is the picture
推荐答案
如果这是一个模拟器，确保模拟器的SD卡连接到它。
If this is an emulator, make sure that emulator has an SDCard attached to it.
此外，最好的做法是使用<一个href="http://developer.android.com/reference/android/os/Environment.html#getExternalStorageDirectory%28%29">getExternalStorageDirectory().
Also, best practice is to use getExternalStorageDirectory().
尝试把权限线下的权利使用-SDK 行。
Try putting the permissions line right under the uses-sdk line.
使用不同的文件名不是 traceview ，以确保没有其他应用程序有锁就可以了。
Use a different file name than traceview to make sure no other app has lock on it.
您SD卡显示为空。你已经能够前访问它？它可能已损坏。
Your SD Card appears to be empty. Have you been able to access it before? It may be corrupt.
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