监听我自己的应用程序制作的LogCat Entires

Question

Am I able to listen for messages being places into the LogCat by my own application?

For example something like...

// Somewhere in my application (on a background service):
Log.i("myModule", "Something been done");

and....

    // Somewhere else something like... 
    LogCatListener logCatListener = new LogCatListener()
    {
       public void onInfoRecieved(String tag, String message)
       { 
          //Do whatever you want with the message
       }
    }

I'm an Android noob so be gentle with me!

Thanks.

Answer 1

Unfortunately it looks like you directly can't do that for typical Log calls ( .d , .i , .w ). If you look at the source code of the Log class ( https://android.googlesource.com/platform/frameworks/base/+/android-4.3_r2.1/core/java/android/util/Log.java ) you'll see that these calls are just translated into a println_native , a private function mapped to a native implementation.

Also, the Log class is final, so you can't extend it and hook into .d , .i , .e , .w

I'm afraid your only solution is to write a Log class wrapper if you need to capture those calls. This will work for your custom Log's but obviously not for the system-issued calls to the Log class.

But good news is there's a special Log function that allows listeners. There's a funny method on the Log class:

 public static TerribleFailureHandler setWtfHandler(TerribleFailureHandler handler)

And you can set a handler that will be called when you do

   Log.wtf (TAG, message)

funny google method names :)