/*
* Copyright 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.swiperefreshlistfragment;
import com.example.android.common.dummydata.Cheeses;
import com.example.android.common.logger.Log;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import java.util.List;
/**
* A sample which shows how to use {@link android.support.v4.widget.SwipeRefreshLayout} within a
* {@link android.support.v4.app.ListFragment} to add the 'swipe-to-refresh' gesture to a
* {@link android.widget.ListView}. This is provided through the provided re-usable
* {@link SwipeRefreshListFragment} class.
*
* <p>To provide an accessible way to trigger the refresh, this app also provides a refresh
* action item. This item should be displayed in the Action Bar's overflow item.
*
* <p>In this sample app, the refresh updates the ListView with a random set of new items.
*
* <p>This sample also provides the functionality to change the colors displayed in the
* {@link android.support.v4.widget.SwipeRefreshLayout} through the options menu. This is meant to
* showcase the use of color rather than being something that should be integrated into apps.
*/
public class SwipeRefreshListFragmentFragment extends SwipeRefreshListFragment {
private static final String LOG_TAG = SwipeRefreshListFragmentFragment.class.getSimpleName();
private static final int LIST_ITEM_COUNT = 20;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Notify the system to allow an options menu for this fragment.
setHasOptionsMenu(true);
}
// BEGIN_INCLUDE (setup_views)
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
/**
* Create an ArrayAdapter to contain the data for the ListView. Each item in the ListView
* uses the system-defined simple_list_item_1 layout that contains one TextView.
*/
ListAdapter adapter = new ArrayAdapter<String>(
getActivity(),
android.R.layout.simple_list_item_1,
android.R.id.text1,
Cheeses.randomList(LIST_ITEM_COUNT));
// Set the adapter between the ListView and its backing data.
setListAdapter(adapter);
// BEGIN_INCLUDE (setup_refreshlistener)
/**
* Implement {@link SwipeRefreshLayout.OnRefreshListener}. When users do the "swipe to
* refresh" gesture, SwipeRefreshLayout invokes
* {@link SwipeRefreshLayout.OnRefreshListener#onRefresh onRefresh()}. In
* {@link SwipeRefreshLayout.OnRefreshListener#onRefresh onRefresh()}, call a method that
* refreshes the content. Call the same method in response to the Refresh action from the
* action bar.
*/
setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
Log.i(LOG_TAG, "onRefresh called from SwipeRefreshLayout");
initiateRefresh();
}
});
// END_INCLUDE (setup_refreshlistener)
}
// END_INCLUDE (setup_views)
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.main_menu, menu);
}
// BEGIN_INCLUDE (setup_refresh_menu_listener)
/**
* Respond to the user's selection of the Refresh action item. Start the SwipeRefreshLayout
* progress bar, then initiate the background task that refreshes the content.
*
* <p>A color scheme menu item used for demonstrating the use of SwipeRefreshLayout's color
* scheme functionality. This kind of menu item should not be incorporated into your app,
* it just to demonstrate the use of color. Instead you should choose a color scheme based
* off of your application's branding.
*/
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_refresh:
Log.i(LOG_TAG, "Refresh menu item selected");
// We make sure that the SwipeRefreshLayout is displaying it's refreshing indicator
if (!isRefreshing()) {
setRefreshing(true);
}
// Start our refresh background task
initiateRefresh();
return true;
case R.id.menu_color_scheme_1:
Log.i(LOG_TAG, "setColorScheme #1");
item.setChecked(true);
// Change the colors displayed by the SwipeRefreshLayout by providing it with 4
// color resource ids
setColorScheme(R.color.color_scheme_1_1, R.color.color_scheme_1_2,
R.color.color_scheme_1_3, R.color.color_scheme_1_4);
return true;
case R.id.menu_color_scheme_2:
Log.i(LOG_TAG, "setColorScheme #2");
item.setChecked(true);
// Change the colors displayed by the SwipeRefreshLayout by providing it with 4
// color resource ids
setColorScheme(R.color.color_scheme_2_1, R.color.color_scheme_2_2,
R.color.color_scheme_2_3, R.color.color_scheme_2_4);
return true;
case R.id.menu_color_scheme_3:
Log.i(LOG_TAG, "setColorScheme #3");
item.setChecked(true);
// Change the colors displayed by the SwipeRefreshLayout by providing it with 4
// color resource ids
setColorScheme(R.color.color_scheme_3_1, R.color.color_scheme_3_2,
R.color.color_scheme_3_3, R.color.color_scheme_3_4);
return true;
}
return super.onOptionsItemSelected(item);
}
// END_INCLUDE (setup_refresh_menu_listener)
// BEGIN_INCLUDE (initiate_refresh)
/**
* By abstracting the refresh process to a single method, the app allows both the
* SwipeGestureLayout onRefresh() method and the Refresh action item to refresh the content.
*/
private void initiateRefresh() {
Log.i(LOG_TAG, "initiateRefresh");
/**
* Execute the background task, which uses {@link android.os.AsyncTask} to load the data.
*/
new DummyBackgroundTask().execute();
}
// END_INCLUDE (initiate_refresh)
// BEGIN_INCLUDE (refresh_complete)
/**
* When the AsyncTask finishes, it calls onRefreshComplete(), which updates the data in the
* ListAdapter and turns off the progress bar.
*/
private void onRefreshComplete(List<String> result) {
Log.i(LOG_TAG, "onRefreshComplete");
// Remove all items from the ListAdapter, and then replace them with the new items
ArrayAdapter<String> adapter = (ArrayAdapter<String>) getListAdapter();
adapter.clear();
for (String cheese : result) {
adapter.add(cheese);
}
// Stop the refreshing indicator
setRefreshing(false);
}
// END_INCLUDE (refresh_complete)
/**
* Dummy {@link AsyncTask} which simulates a long running task to fetch new cheeses.
*/
private class DummyBackgroundTask extends AsyncTask<Void, Void, List<String>> {
static final int TASK_DURATION = 3 * 1000; // 3 seconds
@Override
protected List<String> doInBackground(Void... params) {
// Sleep for a small amount of time to simulate a background-task
try {
Thread.sleep(TASK_DURATION);
} catch (InterruptedException e) {
e.printStackTrace();
}
// Return a new random list of cheeses
return Cheeses.randomList(LIST_ITEM_COUNT);
}
@Override
protected void onPostExecute(List<String> result) {
super.onPostExecute(result);
// Tell the Fragment that the refresh has completed
onRefreshComplete(result);
}
}
}