android利用多线程加载图片【不使用第三方库】

前言

这是一份关于android利用线程池加载图片的demo。有部分参考意义。

代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="match_parent"android:layout_height="match_parent"><TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="这是四种线程池的测试实验"/><TableLayout
            android:layout_width="match_parent"android:layout_height="wrap_content"><TableRow><Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="SingleThreadExecutor" android:id="@+id/btn_SingleThreadExecutor"/><Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="FixedThreadPool" android:id="@+id/btn_FixedThreadPool"/></TableRow><TableRow><Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="CachedThreadPool" android:id="@+id/btn_CachedThreadPool"/><Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="ScheduledThreadPool" android:id="@+id/btn_ScheduledThreadPool"/></TableRow><TableRow><Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="实际环境中的图片加载" android:id="@+id/btn_production"/></TableRow></TableLayout><ScrollView android:layout_width="fill_parent" android:layout_height="wrap_content"><LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" android:id="@+id/panel_list"></LinearLayout></ScrollView>
</LinearLayout>

package com.example.apppractise.app;import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.media.Image;
import android.media.ThumbnailUtils;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.ImageRequest;
import com.android.volley.toolbox.Volley;
import com.example.Sys.utils.ImgUtil;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;/*** Created by Administrator on 2015/7/3.*/
public class ThreadPoolDemo extends Activity {private Button btn_singleThreadPool;private Button btn_fixedThreadPool;private Button btn_canchedThreadPool;private Button btn_scheduledThreadPool;private Button btn_production;private LinearLayout panelList;Handler handler=new Handler();ExecutorService pool_single;ExecutorService pool_fixed;ExecutorService pool_cached;ExecutorService pool_schedule;RequestQueue mQueue;class ImageURLInfo{public String url="";public String title="";public ImageURLInfo(){}public ImageURLInfo(String _url,String _title){url=_url;title=_title;}}//--这是图片数据列表。这个先随便在网上搜几幅图片来，然后再加载。protected ArrayList<ImageURLInfo> urlInfos=new ArrayList<ImageURLInfo>();@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.thread_pool_demo);mQueue= Volley.newRequestQueue(this);initData();initUI();initEvents();}private void initUI(){panelList=(LinearLayout)findViewById(R.id.panel_list);btn_singleThreadPool=(Button)findViewById(R.id.btn_SingleThreadExecutor);btn_fixedThreadPool=(Button)findViewById(R.id.btn_FixedThreadPool);btn_canchedThreadPool=(Button)findViewById(R.id.btn_CachedThreadPool);btn_scheduledThreadPool=(Button)findViewById(R.id.btn_ScheduledThreadPool);btn_production=(Button)findViewById(R.id.btn_production);}private void initEvents(){btn_singleThreadPool.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {clearList();//--将相关图片获取出来。for(int i=0;i<urlInfos.size();i++){final ImageURLInfo iinfo=urlInfos.get(i);pool_single.execute(new Runnable() {@Overridepublic void run() {appendImage(iinfo);try{Thread.sleep(2000);}catch (Exception ed){ed.printStackTrace();}}});}}});btn_fixedThreadPool.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {clearList();//--将相关图片获取出来。for(int i=0;i<urlInfos.size();i++){final ImageURLInfo iinfo=urlInfos.get(i);pool_fixed.execute(new Runnable() {@Overridepublic void run() {appendImage(iinfo);try{Thread.sleep(2000);}catch (Exception ed){ed.printStackTrace();}}});}}});btn_canchedThreadPool.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {clearList();//--将相关图片获取出来。for(int i=0;i<urlInfos.size();i++){final ImageURLInfo iinfo=urlInfos.get(i);pool_cached.execute(new Runnable() {@Overridepublic void run() {appendImage(iinfo);try{Thread.sleep(2000);}catch (Exception ed){ed.printStackTrace();}}});}}});btn_scheduledThreadPool.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {clearList();//--将相关图片获取出来。for(int i=0;i<urlInfos.size();i++){final ImageURLInfo iinfo=urlInfos.get(i);pool_schedule.execute(new Runnable() {@Overridepublic void run() {appendImage(iinfo);try{// Thread.sleep(2000);}catch (Exception ed){ed.printStackTrace();}}});}}});btn_production.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {clearList();loadImagesInProduction();}});}private void initData(){pool_single = Executors. newSingleThreadExecutor();pool_fixed=Executors.newFixedThreadPool(2);pool_schedule=Executors.newScheduledThreadPool(5);pool_cached=Executors.newCachedThreadPool();urlInfos.add(new ImageURLInfo("http://att2.citysbs.com/guangzhou/sns01/forum/2011/05/23-17/20110523_5fbe97609ec6dcbcf8390UKPwPXpNu8v.jpg","我们的婚礼"));urlInfos.add(new ImageURLInfo("http://imgst-dl.meilishuo.net/pic/_o/85/fb/e4b47e2b627c0b426936848c027d_1944_2592.jpeg","飞机上某个女孩自拍照"));urlInfos.add(new ImageURLInfo("http://cdn.duitang.com/uploads/item/201405/16/20140516134733_L5zhQ.jpeg","浓妆艳抹女孩的红唇"));urlInfos.add(new ImageURLInfo("http://photo.sohu.com/20041013/Img222475331.jpg","清爽女孩自拍【鱼泡眼还是卧蚕？】"));urlInfos.add(new ImageURLInfo("http://img1d.xgo-img.com.cn/pics/401/400109.jpg","一个车模【工作辛苦，汗如雨下啊】"));urlInfos.add(new ImageURLInfo("http://pic.cnhubei.com/attachment/201203/1/2781_13305689234Uuh.jpg","有山有水有女人【请忽略女人吧，1m多的图片，可以测试加载速度】"));urlInfos.add(new ImageURLInfo("http://ff.topit.me/f/be/ff/1141477403584ffbefo.jpg","韩国洗剪吹【我真分不出韩国男明星，感觉都一样 囧】"));urlInfos.add(new ImageURLInfo("http://img1.ph.126.net/dMMszRbV4BKyzzy3Jo9PaQ==/2680486203232537044.jpg","范晓萱广告封面【范晓萱是谁】"));urlInfos.add(new ImageURLInfo("http://photo.sohu.com/20041013/Img222475337.jpg","凳子上的女孩【主角感觉是那张黄凳子，太显眼了】"));urlInfos.add(new ImageURLInfo("http://cms.gdzjdaily.com.cn/2011bb/upload/2010-12/1293267071.jpg","爱尔美广告封面【我没打广告，用用图片而已】"));}private void clearList(){panelList.removeAllViews();}private void appendImage(ImageURLInfo imageURLInfo){DefaultHttpClient httpclient = new DefaultHttpClient();HttpGet httpget = new HttpGet(imageURLInfo.url);try {HttpResponse resp = httpclient.execute(httpget);//判断是否正确执行if (HttpStatus.SC_OK == resp.getStatusLine().getStatusCode()) {//将返回内容转换为bitmapHttpEntity entity = resp.getEntity();InputStream in = entity.getContent();BitmapFactory.Options boptions=new BitmapFactory.Options();boptions.inJustDecodeBounds=true;try {byte[] imgdata=readStream(in);//BitmapFactory.decodeStream(in,null,boptions);BitmapFactory.decodeByteArray(imgdata,0,imgdata.length,boptions);int imageHeight=boptions.outHeight;int imageWidth=boptions.outWidth;boptions.inJustDecodeBounds=false;int inSampleSize=ImgUtil.calculateInSampleSize(imageWidth,imageHeight,200,200);boptions.inSampleSize=inSampleSize;//final Bitmap resizeBitmap=BitmapFactory.decodeStream(in,null,boptions);final Bitmap resizeBitmap=BitmapFactory.decodeByteArray(imgdata, 0, imgdata.length, boptions);//final Bitmap resizeBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),bitmap.getHeight(),new Matrix(), false);//向handler发送消息，执行显示图片操作handler.post(new Runnable() {@Overridepublic void run() {ImageView imageView=new ImageView(ThreadPoolDemo.this);imageView.setImageBitmap(resizeBitmap);panelList.addView(imageView);}});} catch (Exception e) {e.printStackTrace();}in.close();}} catch (Exception e) {e.printStackTrace();setTitle(e.getMessage());} finally {httpclient.getConnectionManager().shutdown();}}/** 得到图片字节流 数组大小* */public static byte[] readStream(InputStream inStream) throws Exception{ByteArrayOutputStream outStream = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = 0;while( (len=inStream.read(buffer)) != -1){outStream.write(buffer, 0, len);}outStream.close();inStream.close();return outStream.toByteArray();}private void loadImagesInProduction(){for(int i=0;i<urlInfos.size();i++){ImageURLInfo info=urlInfos.get(i);ImageRequest imageRequest=new ImageRequest(info.url, new Response.Listener<Bitmap>() {@Overridepublic void onResponse(Bitmap response) {ImageView imageView=new ImageView(ThreadPoolDemo.this);imageView.setImageBitmap(response);panelList.addView(imageView);Log.e("log", "抓取成功");}}, 400, 400, Bitmap.Config.ARGB_4444, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError error) {ImageView imageView=new ImageView(ThreadPoolDemo.this);error.printStackTrace();imageView.setImageResource(R.drawable.ui_imgselect_albums_bg);panelList.addView(imageView);Log.e("log","抓取失败");}});mQueue.add(imageRequest);}}@Overrideprotected void onStop(){super.onStop();pool_single.shutdown();pool_fixed.shutdown();pool_cached.shutdown();pool_schedule.shutdown();}
}

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android利用多线程加载图片【不使用第三方库】

前言

代码

android利用多线程加载图片【不使用第三方库】相关推荐

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