PullToRefreshViewPagerActivity.java

/*******************************************************************************
 * Copyright 2011, 2012 Chris Banes.
 *
 * 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.handmark.pulltorefresh.samples;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;

import com.handmark.pulltorefresh.extras.viewpager.PullToRefreshViewPager;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;

public class PullToRefreshViewPagerActivity extends Activity implements OnRefreshListener<ViewPager> {

	private PullToRefreshViewPager mPullToRefreshViewPager;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_ptr_viewpager);

		mPullToRefreshViewPager = (PullToRefreshViewPager) findViewById(R.id.pull_refresh_viewpager);
		mPullToRefreshViewPager.setOnRefreshListener(this);

		ViewPager vp = mPullToRefreshViewPager.getRefreshableView();
		vp.setAdapter(new SamplePagerAdapter());
	}

	@Override
	public void onRefresh(PullToRefreshBase<ViewPager> refreshView) {
		new GetDataTask().execute();
	}

	static class SamplePagerAdapter extends PagerAdapter {

		private static int[] sDrawables = { R.drawable.wallpaper, R.drawable.wallpaper, R.drawable.wallpaper,
				R.drawable.wallpaper, R.drawable.wallpaper, R.drawable.wallpaper };

		@Override
		public int getCount() {
			return sDrawables.length;
		}

		@Override
		public View instantiateItem(ViewGroup container, int position) {
			ImageView imageView = new ImageView(container.getContext());
			imageView.setImageResource(sDrawables[position]);

			// Now just add ImageView to ViewPager and return it
			container.addView(imageView, LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);

			return imageView;
		}

		@Override
		public void destroyItem(ViewGroup container, int position, Object object) {
			container.removeView((View) object);
		}

		@Override
		public boolean isViewFromObject(View view, Object object) {
			return view == object;
		}
	}

	private class GetDataTask extends AsyncTask<Void, Void, Void> {

		@Override
		protected Void doInBackground(Void... params) {
			// Simulates a background job.
			try {
				Thread.sleep(4000);
			} catch (InterruptedException e) {
			}
			return null;
		}

		@Override
		protected void onPostExecute(Void result) {
			mPullToRefreshViewPager.onRefreshComplete();
			super.onPostExecute(result);
		}
	}

}