SwipeRefreshLayout, refresh in background thread

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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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