android 异步加载自动切换

基本信息
源码名称：android 异步加载自动切换
源码大小：0.71M
文件格式：.zip
开发语言：Java
更新时间：2015-12-23
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源码介绍
异步加载自动切换.zip
package com.teffy.viewpager;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;

import com.teffy.viewpager.bean.ImageAndUrl;
import com.teffy.viewpager.tools.AsyncImageLoader;
import com.teffy.viewpager.tools.AsyncImageLoader.ImageCallBack;
import com.teffy.viewpager.tools.FileCache;
import com.teffy.viewpager.utils.ToastUtils;

public class MainActivity extends Activity {
	private ViewPager mViewPager;
	private ViewPagerAdapter adapter;
	LayoutInflater inflater;
	AsyncImageLoader asyncImageLoader;
	
	Bitmap defaultbmp;
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		inflater = getLayoutInflater();
		
		defaultbmp = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
		
		asyncImageLoader = new AsyncImageLoader();

		mViewPager = (ViewPager) findViewById(R.id.vp_guanggao);
		mViewPager.setOnPageChangeListener(new OnPageChangeListener() {
			@Override
			public void onPageSelected(int position) {
				// title.setText(titles[position]);
				System.out.println("position   "   position);
				dots.get(oldPosition).setBackgroundResource(R.drawable.dxt_point_nomral);
				dots.get(position).setBackgroundResource(R.drawable.dxt_point_selected);

				oldPosition = position;
				currentItem = position;
			}

			@Override
			public void onPageScrolled(int arg0, float arg1, int arg2) {
				System.out.println("onPageScrolled       arg0-->"  arg0  "  ,arg1-->"   arg1    "   ,arg2-->" arg2);
			}

			@Override
			public void onPageScrollStateChanged(int arg0) {
				System.out.println("onPageScrollStateChanged    arg0 -->"   arg0);
			}
		});

		getDatas();
	}

	private ArrayList<ImageView> images;

	String[] urls = new String[] {
			"http://img2.mtime.cn/up/12/2432012/fe826018-3877-4046-b51d-31e76c2b9c9d_500.jpg",
			"http://pic5.nipic.com/20100106/3267716_155613095015_2.jpg",
			"http://pic11.nipic.com/20101210/2531170_111449259416_2.jpg",
			"http://pic11.nipic.com/20101210/2531170_111449179301_2.jpg",
			"http://www.foto8.net/files/201004/27/d272194910.jpg",
			"http://www.sootuu.com/photo/UploadFile/2006-4/20064304138937.jpg",
			"http://www.itxtbook.com/attachment/Day_081022/23_163307_e9b4513a7afee66.jpg",
			"http://img7.mypsd.com.cn/20120821/Mypsd_13920_201208211752500005B.jpg"
	};
	List<ImageAndUrl> imageInfosShow = new ArrayList<ImageAndUrl>();
	private void getDatas() {
		for (int i = 0; i < urls.length; i  ) {
			ImageAndUrl item =  new ImageAndUrl();
			item.setImageurl(urls[i]);
			item.setUrl("item-->" i);
			imageInfosShow.add(item);
		}
		images = new ArrayList<ImageView>();
		for (int i = 0; i < imageInfosShow.size(); i  ) {
			ImageView item = new ImageView(this);
			images.add(item);
		}
		initDots();
		
		adapter = new ViewPagerAdapter();
		mViewPager.setAdapter(adapter);
		vpChangeTask();
	}

	private ArrayList<View> dots = new ArrayList<View>();
	private void initDots() {
		LinearLayout ll_vp_point = (LinearLayout) findViewById(R.id.ll_vp_point);
//		for (int i = 0; i < imageInfosShow.size(); i  ) {
		for (int i = 0; i < imageInfosShow.size(); i  ) {
			ImageView iv_image = (ImageView) inflater.inflate(R.layout.item_dots, null);
			if(i ==0){
				iv_image.setBackgroundResource(R.drawable.dxt_point_selected);
			}
			iv_image.setTag(imageInfosShow.get(i));
			ll_vp_point.addView(iv_image);
			dots.add(iv_image);
		}
	}

	// 切换图片
	private class ViewPagerTask implements Runnable {
		@Override
		public void run() {
			currentItem = (currentItem   1) % imageInfosShow.size();
			mHandler.obtainMessage().sendToTarget();
		}
	}

	private Handler mHandler = new Handler() {
		@Override
		public void handleMessage(Message msg) {
			Animation animation=AnimationUtils.loadAnimation(MainActivity.this, R.anim.enter);
//			mViewPager.startAnimation(animation);
			
			mViewPager.setAnimationCacheEnabled(false);
			mViewPager.setAnimation(animation);
			mViewPager.setCurrentItem(currentItem);
		}
	};

	private int oldPosition = 0;//记录上一次点的位置
	private int currentItem; //当前页面
	private ScheduledExecutorService scheduledExecutorService;

	private void vpChangeTask() {
		scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
		scheduledExecutorService.scheduleWithFixedDelay(new ViewPagerTask(), 2,3, TimeUnit.SECONDS);
	}

	private class ViewPagerAdapter extends PagerAdapter {
		
		@Override
		public void destroyItem(View container, int position, Object object) {
			((ViewPager) container).removeView((View) object);
		}

		@Override
		public int getCount() {
			return imageInfosShow.size();
		}

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

		@Override
		public Object instantiateItem(final View view, int position) {
			ImageAndUrl item = imageInfosShow.get(position);
			final View imageLayout = inflater.inflate(R.layout.item_pager_image, null);
			final ImageView imageView = (ImageView) imageLayout.findViewById(R.id.image);
			final ProgressBar spinner = (ProgressBar) imageLayout.findViewById(R.id.loading);
			final String imgUrl = item.getImageurl();
			imageView.setTag(imgUrl);
			imageView.setOnClickListener(new OnClickListener() {
				@Override
				public void onClick(View v) {
//					ImageAndUrl imageInfo = (ImageAndUrl) v.getTag();
//					if (!TextUtils.isEmpty(imageInfo.getUrl())) {
//						Uri url = Uri.parse(imageInfo.getUrl());
//						Intent it = new Intent(Intent.ACTION_VIEW, url);
//						startActivity(it);
//					} else {
//						ToastUtils.showShort(MainActivity.this, "暂无此链接信息");
//						return;
//					}
				}
			});
			final ProgressBar progressBar = (ProgressBar) imageLayout.findViewById(R.id.loading);
			// 如果联网
			if (checkConnection()) {
				Bitmap bmpFromSD = FileCache.getInstance().getBmp(imgUrl);
				if (null != bmpFromSD) {
					imageView.setLayoutParams(new LinearLayout.LayoutParams(
							LinearLayout.LayoutParams.FILL_PARENT, bmpFromSD.getHeight()));
					imageView.setImageBitmap(bmpFromSD);
					progressBar.setVisibility(View.INVISIBLE);
				} else {
					Drawable cachedImage = asyncImageLoader.loaDrawable(imgUrl,
							new ImageCallBack() {
								@Override
								public void imageLoaded(Drawable imageDrawable) {
									Bitmap bitmap = drawToBmp(imageDrawable);
									FileCache.getInstance().savaBmpData(imgUrl, bitmap);// 先缓存起来
//									FileCache.getInstance().savaBmpData(view.getTag().toString(), bitmap);// 先缓存起来
									ImageView imageViewByTag = null;
									if (null != bitmap) {
										imageViewByTag = (ImageView) imageView.findViewWithTag(imgUrl);
										imageViewByTag.setLayoutParams(new LinearLayout.LayoutParams(
														LinearLayout.LayoutParams.WRAP_CONTENT,bitmap.getHeight()));
									}
									if (imageViewByTag != null) {
										if (isWifi(MainActivity.this)) {
											imageViewByTag
													.setImageBitmap(bitmap);
											progressBar
													.setVisibility(View.INVISIBLE);
										} else {
											if (bitmap != null) {
												imageViewByTag.setLayoutParams(new LinearLayout.LayoutParams(
																LinearLayout.LayoutParams.FILL_PARENT,
																LinearLayout.LayoutParams.WRAP_CONTENT));
												imageViewByTag.setImageBitmap(bitmap);
												imageViewByTag.setScaleType(ImageView.ScaleType.MATRIX);
												progressBar.setVisibility(View.INVISIBLE);
											}
										}
									}
								}
							});
					if (cachedImage == null) {
						imageView.setImageBitmap(defaultbmp);
					} else {
						if (isWifi(MainActivity.this)) {
							Bitmap bitmap = drawToBmp(cachedImage);
							imageView.setLayoutParams(new LinearLayout.LayoutParams(
											LinearLayout.LayoutParams.WRAP_CONTENT,
											bitmap.getHeight()));
							imageView.setImageBitmap(bitmap);
						} else {
							imageView.setLayoutParams(new LinearLayout.LayoutParams(
											LinearLayout.LayoutParams.FILL_PARENT,
											LinearLayout.LayoutParams.WRAP_CONTENT));
							Bitmap bitmap = drawToBmp(cachedImage);
							imageView.setImageBitmap(bitmap);
						}
						progressBar.setVisibility(View.INVISIBLE);
					}
				}
			} else {
				Bitmap bmpFromSD = FileCache.getInstance().getBmp(imgUrl);
				if (null != bmpFromSD) {
					ImageView imageViewByTag = (ImageView) imageView.findViewWithTag(imgUrl);
					imageViewByTag.setLayoutParams(new LinearLayout.LayoutParams(
									LinearLayout.LayoutParams.WRAP_CONTENT,
									bmpFromSD.getHeight()));
					imageViewByTag.setImageBitmap(bmpFromSD);
					progressBar.setVisibility(View.INVISIBLE);
				} else {
					imageView.setImageBitmap(defaultbmp);
					progressBar.setVisibility(View.GONE);
				}
			}
			((ViewPager) view).addView(imageLayout, 0);
//			return images.get(position % images.size());
			return imageLayout;
		}
	}

	/**
	 * Drawable转换成Bitmap
	 * @param d
	 * @return
	 */
	public Bitmap drawToBmp(Drawable d) {
		if (null != d) {
			BitmapDrawable bd = (BitmapDrawable) d;
			return bd.getBitmap();
		}
		return null;
	}

	/**
	 * 检测网络连接
	 * 
	 * @return
	 */
	public boolean checkConnection() {
		ConnectivityManager connectivityManager = (ConnectivityManager) this
				.getSystemService(CONNECTIVITY_SERVICE);
		NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
		if (networkInfo != null) {
			return networkInfo.isAvailable();
		}
		return false;
	}

	/**
	 * Wifi是否可用
	 * @param mContext
	 * @return
	 */
	public boolean isWifi(Context mContext) {
		ConnectivityManager connectivityManager = (ConnectivityManager) mContext
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
		if (activeNetInfo != null && activeNetInfo.getTypeName().equals("WIFI")) {
			return true;
		}
		return false;
	}
}