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SwipeRefreshLayout refresh in background thread

Last post show a basic example of SwipeRefreshLayout. But, normally refreshing involve some longtime task; such as loading data from Internet. This example show how to refresh with longtime task in background thread.


MainActivity.java

package com.blogspot.android_er.androidswiperefresh;

import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Toast;

import java.text.DateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class MainActivity extends AppCompatActivity {

 SwipeRefreshLayout swipeRefreshLayout;
 ListView swipeList;

 List<String> myList;
 ListAdapter adapter;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 swipeRefreshLayout = (SwipeRefreshLayout)findViewById(R.id.swiperefreshlayout);
 swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
 @Override
 public void onRefresh() {
 refresh();
 }
 });

 swipeList = (ListView)findViewById(R.id.swipelist);

 myList = new ArrayList<>();
 adapter = new ArrayAdapter<String>(
 this, android.R.layout.simple_list_item_1, myList);
 swipeList.setAdapter(adapter);

 swipeList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
 @Override
 public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
 String item = (String) parent.getItemAtPosition(position);
 Toast.makeText(MainActivity.this, item, Toast.LENGTH_LONG).show();
 }
 });
 }

 private void refresh(){

 final int pos = myList.size();
 myList.add(pos, "Refreshing...");
 swipeList.invalidateViews();
 swipeRefreshLayout.setRefreshing(true);

 //refresh long-time task in background thread
 new Thread(new Runnable() {
 @Override
 public void run() {
 try {
 //dummy delay for 2 second
 Thread.sleep(2000);
 } catch (InterruptedException e) {
 e.printStackTrace();
 }

 //update ui on UI thread
 runOnUiThread(new Runnable() {
 @Override
 public void run() {
 String currentDateTime =
 DateFormat.getDateTimeInstance().format(new Date());
 myList.set(pos, pos + " - " + currentDateTime);
 swipeList.invalidateViews();
 swipeRefreshLayout.setRefreshing(false);
 }
 });

 }
 }).start();
 }
}

Keep using the layout in last post.

more:
- SwipeRefreshLayout, work with RecyclerView

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