Android Looper和Handler分析(8)

            if (msg != null) { 
                if (msg.target == null) { 
                    // No target is a magic identifier for the quit message. 
                    return; 
                } 
                if (me.mLogging!= null) me.mLogging.println( 
                        ">>>>> Dispatching to " + msg.target + " " 
                        + msg.callback + ": " + msg.what 
                        ); 
                msg.target.dispatchMessage(msg); 
                if (me.mLogging!= null) me.mLogging.println( 
                        "<<<<< Finished to    " + msg.target + " " 
                        + msg.callback); 
                msg.recycle(); 
            } 
        } 
    } 
 
    /**
     * Return the Looper object associated with the current thread.  Returns
     * null if the calling thread is not associated with a Looper.
     */ 
//返回和线程相关的looper 
    public static final Looper myLooper() { 
        return (Looper)sThreadLocal.get(); 
    } 
 
    /**
     * Control logging of messages as they are processed by this Looper.  If
     * enabled, a log message will be written to <var>printer</var>