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   源码介绍

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package com.tc.photodemo;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.FailReason;
import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;
import com.nostra13.universalimageloader.core.listener.ImageLoadingListener;
import com.tc.photodemo.adapter.Mypager;

public class PhotoActivity extends Activity {
	ArrayList<String> photoUri = null;
	TextView title;
	ProgressBar progressBar1;
	ViewPager viewpager;
	Mypager adapter;
	ImageLoader loader;
	DisplayImageOptions options;
	ArrayList<View> view = new ArrayList<View>();
	Context context = null;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.fragment_main);
		photoUri = new ArrayList<>();
		photoUri.add("http://img0.bdstatic.com/img/image/2043d07892fc42f2350bebb36c4b72ce1409212020.jpg");
		photoUri.add("http://a.hiphotos.baidu.com/image/w%3D230/sign=e2d6e66ba50f4bfb8cd09957334d788f/1e30e924b899a9012cdcd2c21c950a7b0308f55d.jpg");
		photoUri.add("http://c.hiphotos.baidu.com/image/w%3D230/sign=ce9f962e38292df597c3ab168c305ce2/71cf3bc79f3df8dc8b71dc90cf11728b47102866.jpg");
		photoUri.add("http://img0.bdstatic.com/img/image/shouye/mingxing0408.jpg");
		loader = ImageLoader.getInstance();
		options = new DisplayImageOptions.Builder()
				.showImageForEmptyUri(R.drawable.ic_launcher)
				.showImageOnFail(R.drawable.ic_launcher).cacheInMemory(true)
				.cacheOnDisc(true).displayer(new RoundedBitmapDisplayer(0))
				.build();
		init();
		viewpagerListener();
	}

	private void viewpagerListener() {
		// TODO Auto-generated method stub
		viewpager.setOnPageChangeListener(new OnPageChangeListener() {

			@Override
			public void onPageSelected(int arg0) {
				// TODO Auto-generated method stub
				title.setText((arg0   1)   "/"   view.size());
			}

			@Override
			public void onPageScrolled(int arg0, float arg1, int arg2) {
				// TODO Auto-generated method stub

			}

			@Override
			public void onPageScrollStateChanged(int arg0) {
				// TODO Auto-generated method stub

			}
		});
	}

	private void init() {
		// TODO Auto-generated method stub
		context = this;
		title = (TextView) findViewById(R.id.textView1);
		progressBar1 = (ProgressBar) findViewById(R.id.progressBar1);
		viewpager = (ViewPager) findViewById(R.id.viewpager);
		adapter = new Mypager();
		viewpager.setAdapter(adapter);
		

		for (int i = 0; i < photoUri.size(); i  ) {
			ImageView im = new ImageView(context);
			im.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
					LayoutParams.WRAP_CONTENT));
			view.add(im);
			loader.displayImage(photoUri.get(i), im,
					new ImageLoadingListener() {

						@Override
						public void onLoadingStarted(String arg0, View arg1) {
							// TODO Auto-generated method stub
							progressBar1.setVisibility(View.VISIBLE);
						}

						@Override
						public void onLoadingFailed(String arg0, View arg1,
								FailReason arg2) {
							// TODO Auto-generated method stub
							progressBar1.setVisibility(View.GONE);
						}

						@Override
						public void onLoadingComplete(String arg0, View arg1,
								Bitmap arg2) {
							// TODO Auto-generated method stub
							progressBar1.setVisibility(View.GONE);
						}

						@Override
						public void onLoadingCancelled(String arg0, View arg1) {
							// TODO Auto-generated method stub
							progressBar1.setVisibility(View.GONE);
						}
					});
		}
		//更新adapter中的数据
		adapter.changData(view);
		title.setText(1   "/"   view.size());
		viewpager.setCurrentItem(0);

	}
}