LoadDataTask.java

package com.example.task;

import android.os.AsyncTask;

import java.lang.ref.WeakReference;


public class LoadDataTask extends AsyncTask<Void, Void, String>
{
	private WeakReference<OnLoadDataListener> mOnLoadDataListener;


	public interface OnLoadDataListener
	{
		void onLoadData();
	}


	public LoadDataTask(OnLoadDataListener onLoadDataListener)
	{
		setListener(onLoadDataListener);
	}


	@Override
	protected String doInBackground(Void... params)
	{
		try
		{
			// TODO: do something
			Thread.sleep(2000);
		}
		catch(InterruptedException e)
		{
			e.printStackTrace();
		}
		return null;
	}


	@Override
	protected void onPostExecute(String result)
	{
		if(isCancelled()) return;

		OnLoadDataListener listener = mOnLoadDataListener.get();
		if(listener != null)
		{
			listener.onLoadData();
		}
	}


	public void setListener(OnLoadDataListener onLoadDataListener)
	{
		mOnLoadDataListener = new WeakReference<>(onLoadDataListener);
	}
}