Main Thread vs Background Thread

Background Thread(In) -> Perform Network Request -> Out
Main Thread(In) -> Click Button -> Out

Asynctask to the rescue
Async -> 非同期
https://developer.android.com/reference/android/os/AsyncTask.html

 private class DownloadFilesTask extends AsyncTask {
     protected Long doInBackground(URL... urls) {
         int count = urls.length;
         long totalSize = 0;
         for (int i = 0; i < count; i++) {
             totalSize += Downloader.downloadFile(urls[i]);
             publishProgress((int) ((i / (float) count) * 100));
             // Escape early if cancel() is called
             if (isCancelled()) break;
         }
         return totalSize;
     }

     protected void onProgressUpdate(Integer... progress) {
         setProgressPercent(progress[0]);
     }

     protected void onPostExecute(Long result) {
         showDialog("Downloaded " + result + " bytes");
     }
 }

concrete class
abstract class
interface

public class Main Activity extends Activity {
	onCreate(){

	}
	onCreate(){

	}
}

public class EarthquakeAsyncTask extends AsyncTask {
	doInBackground(){
		
	}
}