Android - Can't use traceview

I am trying to us开发者_高级运维e traceview to run some profiling against an Android application. I have wrapped the code that I want to trace with the following lines:

Debug.startMethodTracing("xxx");
// code
Debug.stopMethodTracing();

It successfully generated a trace file, that I pulled from sdcard using the following command line:

./adb pull /sdcard/xxx.trace

However when running traceview like this:

./traceview /.../xxx.trace

I am getting the following error message:

Usage: java com.android.traceview.MainWindow [-r] trace -r regression only

I cannot understand this error message and I didn't find anything useful on Google.

Any help would be much appreciated.

Thanks!

make sure that Debug class you imported is this one : android.os.Debug

or do this :

android.os.Debug.startMethodTracing("xxx");
android.os.Debug.stopMethodTracing();