How can I filter Android logcat output by application? I need this because when I attach a device, I can't find the output I want due to spam from other processes.
You should use your own tag, look at: http://developer.android.com/reference/android/util/Log.html
Log.d("AlexeysActivity","what you want to log");
And then when you want to read the log use>
adb logcat -s AlexeysActivity
That filters out everything that doesn't use the same tag.