How to use UnitySendMessage to send progress while downloading a file or apk

Unity Engine
,
1

I got a problem for learning the Android plugin

I have done the privious version that the unity project can download the file.This ensure my plugin can work but a little worry about
the activity declared in AndroidManifest.xml. when I add unitySendMessage in java code. This is so weired that the logcat show the progress value 0~100 and then turn to show unity debug log with the same message as the function it delivers. Should I revise the code with multithread or add another activity?

here is a part of JAVA code:

public class DownLoad extends UnityPlayerActivity
{
     //oncreate constructor bypass
     private long progress = 0L;
     private long total;
     File file;

     public boolean downLoadFile(String httpUrl)
     {
          //.....
          //here already got the inputstream with Url httpUrl 
          //is : the inputstream
          //buf : a byte array as buffer
          //fos : the outstream
          //progress, total : int

           while (count <= 100.0D) {
                 if (is == null)
                     break;
                 int numRead = is.read(buf);
                 if (numRead <= 0) {
                    break;
                 }
                 fos.write(buf, 0, numRead);
                 this.progress += numRead;
                 Log.d("progress", String.valueOf((float)this.progress * 100.0D / (float)this.total) + "%");
                 call(String.valueOf((float)this.progress * 100.0D /this.total));
          }
     }
}

and the call function:

 public void call(String message) {
    UnityPlayer.UnitySendMessage("mGameObject", "CallUnityFromJAVA", message);
  }

and in unity:

public void CallUnityFromJAVA(string message)
{
   Debug.Log(message + "%");
}

the logcat show:

05-31 15:55:17.387: D/progress(8694): .70286863078988%
....
...
.......
05-31 15:29:07.407: I/Unity(8694): (Filename: ./Runtime/ExportGenerated/AndroidManaged/UnityEngineDebug.cpp Line: 43)
05-31 15:29:07.407: I/Unity(8694): 98.97209116048147%
05-31 15:29:07.407: I/Unity(8694):  
05-31 15:29:07.407: I/Unity(8694): (Filename: ./Runtime/ExportGenerated/AndroidManaged/UnityEngineDebug.cpp Line: 43)
05-31 15:29:07.407: I/Unity(8694): 98.97270819887842%
......
...

android progress log always show before unity log

thx~

2

lol ~
This should not be a problem since it can be solved by using www instead of creating an android plugin to download the file. If the download is done, then it can be open or setup by using another plugin.