直接应用项目中的Android图片缓存技术

package com.example.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.os.Message;
import android.support.v4.util.LruCache;
import android.util.Log;


/**
 * 图片的三级缓存工具类{日后项目需要}
 * @author double 江
 *
 */
public class ImageCachceUitl {
  public static final int SUCCSEE = 0;
  public static final int FAIL = 1;
  private Context context;
  private LruCache<String, Bitmap> cache;//lru算法集合，string是图片的url，bitmap为图片的值类型
  private File cacheDir;
  Handler handler;
  private ExecutorService executorService;//维护线性池
  public ImageCachceUitl(Context context ,Handler handler){
    this.context=context;
    this.handler=handler;
    cacheDir=context.getCacheDir();//获得cache文件夹
    //维护几个网络线程下载图片
    executorService=Executors.newFixedThreadPool(5);
    int maxSize=(int) (Runtime.getRuntime().maxMemory()/8);//获得运行环境的内存大小的1/8
    cache=new LruCache<String, Bitmap>(maxSize){
      // TODO 每存储一张图片的大小（作用于内存溢出丢图片）
      @Override
      protected int sizeOf(String key, Bitmap value) {
        //返回当前一行所占的字节数*高度，就是图片的大小
        return value.getRowBytes()*value.getHeight();
      }
    };//当前图片缓存总数的大小
  }
  /**
   * 
   * @param url 下载图片的连接
   * @param position 需要显示图片的imgeView的Tag
   * @return
   */
  public Bitmap getBitmapFromUrl(String url,int position){
    //1内存中获取图片LRU算法
    Bitmap bitmap=cache.get(url);
    //内存中有指定图片
    if (bitmap!=null) {
      Log.i("从内存中获得图片", "从内存中获得图片"+url);
      return bitmap;
    }
    //2文件中获取图片
    bitmap=getBitmapFromFile(url);
    if (bitmap!=null) {
      Log.i("从文件中获得图片", "从文件中获得图片"+url);
      return bitmap;
    }
    //3开启网络下载
    Log.i("从网络中获得图片", "从网络中获得图片"+url);
    getBitmapFromNet(url,position);
    return null;

  }

  /**
   * 网络获取图片
   * @param url 图片的；链接地址
   * @param position 需要显示的imageview的tag
   */
  private void getBitmapFromNet(String url, int position) {

    //开启任务
    executorService.execute(new RunnableTask(url,position));
  }
  //任务接口
  class RunnableTask implements Runnable{
    String imageUrl;
    int position;
    private HttpURLConnection httpURLConnection;
    public RunnableTask(String imageUrl, int position) {
      this.position=position;
      this.imageUrl=imageUrl;
    }

    @Override
    public void run() {
      //子线程的操作，开启网络下载图片
      try {
        URL url=new URL(imageUrl);
        //请求对象
         httpURLConnection=(HttpURLConnection) url.openConnection();
        //网络请求的方式
        httpURLConnection.setRequestMethod("GET");
        //超时的时间，
        httpURLConnection.setConnectTimeout(5000);
        //读取超时的时间
        httpURLConnection.setReadTimeout(5000);
        //httpURLConnection.getResponseCode()拿到最新数据
        if (httpURLConnection.getResponseCode()==200) {
          //success get data from net;get tape 
          InputStream inputStream=httpURLConnection.getInputStream();
          //将流转化成bitmap图片
          Bitmap bitmap=BitmapFactory.decodeStream(inputStream);
          //利用handler机制放入主线程中显示
          Message msg=new Message();
          //需要在主线程中显示的图片msg.obj
          msg.obj=bitmap;
          msg.arg1=position;
          //为msg设置标记
          msg.what=SUCCSEE;
          handler.sendMessage(msg);
          //一，将下载完后的图片保存到内存中
          cache.put(imageUrl, bitmap);
          //二，将下载完后的图片保存到文件中
          writeToLoce(imageUrl,bitmap);
          return;
        }


      } catch (Exception e) {
        e.printStackTrace();
      }
      //关闭请求
      finally{
        //断开服务器
        if (httpURLConnection!=null) {
          httpURLConnection.disconnect();
        }        
      }
      //发送一个空消息
      handler.obtainMessage(FAIL).sendToTarget();
    }
  }
  /**
   * 图片写入cache文件夹下面的操作
   * @param imageUrl
   * @param bitmap
   */
  private void writeToLoce(String imageUrl, Bitmap bitmap) {
    try {
      String bitmapefilename=MD5Encoder.encode(imageUrl).substring(10);
      Log.i("bitmapefilename", bitmapefilename);
      File file=new File(cacheDir, bitmapefilename);
      FileOutputStream fileOutputStream =new FileOutputStream(file);
      //写入文件的操作(1图片类型2图片质量当为100时表示不压缩3文件流)
      bitmap.compress(CompressFormat.JPEG, 100, fileOutputStream);
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }
  /**
   * 读取文件中图片的操作
   * @param url 图片的连接地址
   * @return
   */
  private Bitmap getBitmapFromFile(String url) {
    try {
      //使用Md5工具加密截取前10个字符串
      String bitmapefilename=MD5Encoder.encode(url).substring(10);
      /**
       * 在cache文件夹下面找到指定文件
       * dir cache文件存储路径
       * name 文件名称
       */
      File file=new File(cacheDir, bitmapefilename);
    // file.mkdir();
      //FileInputStream fileInputStream=new FileInputStream(file);
      Bitmap bitmap=BitmapFactory.decodeFile(file.getPath());//完整文件路径
      //Log.i("文件路径", file.getPath().toString());
      //2读取之后放入内存,提高效率
      cache.put(url, bitmap);
      return bitmap;
    } catch (Exception e) {
      e.printStackTrace();
    }
    return null;

  }
}

package com.example.do0me;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.PublicKey;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.MarshalBase64;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import org.xmlpull.v1.XmlPullParserException;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.os.Handler;
import android.util.Base64;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewTreeObserver.OnPreDrawListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;

import com.example.util.AgbcApi;
import com.example.util.ClippingPicture;
import com.example.util.FastBlur;
import com.example.util.ImageCachceUitl;
import com.tencent.connect.avatar.c;



/**
 * 图片三级缓存的测试+图片上传
 * @author double 江
 *
 */
public class MainActivity4 extends Activity {
  private ImageCachceUitl imageCachceUitl;
  private List<String> urlList=new ArrayList<String>();
  private Runnable runnable;
  private Handler handler =new Handler(){
    public void handleMessage(android.os.Message msg) {
      switch (msg.what) {
      case ImageCachceUitl.SUCCSEE:
        Bitmap bitmap=(Bitmap) msg.obj;
        int psition=msg.arg1;
        //通过TAg加载当前的limageview
        ImageView imageView=(ImageView) listview.findViewWithTag(psition);
        if (null!=bitmap&&null!=imageView) {
          imageView.setImageBitmap(bitmap);
        }
        break;
      case ImageCachceUitl.FAIL:
        Toast.makeText(getApplicationContext(), "下载错误", Toast.LENGTH_LONG).show();
      default:
        break;
      }
    };
  };
  private ListView listview;
  private SoapObject request;
  private ExecutorService executorService;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main4);
    listview=(ListView) findViewById(R.id.imageviewlist);
    imageCachceUitl=new ImageCachceUitl(getApplicationContext(), handler);
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");

    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");
    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");

    urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");urlList.add("http://ww4.sinaimg.cn/large/90bd89ffjw1eqvmd6o8r6j20go0p5ju2.jpg");

    listview.setAdapter(new myListAdapt());
    executorService=Executors.newFixedThreadPool(5);
    executorService.execute(new Runnable() {

      @Override
      public void run() {
        getImageromSdk();
      }
    });
  }

  public String getImageFromAndroid(String arg0,String arg1, String arg2){
    Log.i("进入端口方法", "进入端口方法");
    final String methodName="getImageFromAndroid";
    final String soapAction=AgbcApi.NAMESPACE+methodName;
    request = new SoapObject(AgbcApi.NAMESPACE, methodName);
    request.addProperty("arg0",arg1);  
    request.addProperty("arg1",arg2);
    SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);  
    (new MarshalBase64()).register(envelope);    
    envelope.bodyOut = request; 
    envelope.dotNet=false;
    envelope.setOutputSoapObject(request);   
    HttpTransportSE ht = new HttpTransportSE(AgbcApi.TASKSERVICEURL); 
    ht.debug=true; 
    try {

      ht.call(soapAction, envelope);
      Log.i("请求", envelope.bodyIn.toString());
    } catch (IOException | XmlPullParserException e) {
      e.printStackTrace();
    }
    return arg1;

  };

  @SuppressLint("SdCardPath")
  public void getImageromSdk(){
    Log.i("进入获取图片方法", "进入获取图片方法");
    try{
      String srcUrl = "/sdcard/"; //路径
      String fileName = "1.png"; //文件名
      String filrName2="2.jpg";
    List<String>imageList=new ArrayList<>();
    imageList.add(fileName);
    imageList.add(filrName2);    
    for (int i = 0; i < imageList.size(); i++) {
      FileInputStream fis = new FileInputStream(srcUrl + imageList.get(i));
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
      byte[] buffer = new byte[4096];
      int count = 0;
      while((count = fis.read(buffer)) >= 0){
        baos.write(buffer, 0, count);
      }
      String uploadBuffer = new String(Base64.encode(baos.toByteArray(), Base64.DEFAULT)); //进行Base64编码
      String methodName = "uploadImage";     
        getImageFromAndroid(methodName,imageList.get(i), uploadBuffer);  //调用webservice    
      Log.i("connectWebService", "start");  
      fis.close();
}
    }catch(Exception e){
      e.printStackTrace();
    }    
  }
  class myListAdapt extends BaseAdapter{
    private LayoutInflater layoutInflater;
    ImageView list_imag;
    Button list_but;
    @Override
    public int getCount() {
      // TODO Auto-generated method stub
      return urlList.size();
    }

    @Override
    public Object getItem(int position) {
      // TODO Auto-generated method stub
      return urlList.get(position);
    }

    @Override
    public long getItemId(int position) {
      // TODO Auto-generated method stub
      return position;
    }

    @SuppressLint({ "InflateParams", "ViewHolder" })
    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {

      layoutInflater=LayoutInflater.from(getApplication());
      //if (layoutInflater==null) {
      convertView = layoutInflater.inflate(R.layout.image_list_item, null);
      // }
      list_but=(Button) convertView.findViewById(R.id.list_but);
      list_imag=(ImageView) convertView.findViewById(R.id.list_imag);

      list_imag.setTag(position);
      final Bitmap bitmap=imageCachceUitl.getBitmapFromUrl(urlList.get(position), position);
      if (null!=bitmap) {
        list_imag.setImageBitmap(bitmap);
      }
      list_imag.setVisibility(View.VISIBLE);

      list_but.setOnClickListener(new OnClickListener() {



        @Override
        public void onClick(View v) {
          //urlList.get(position);
          Log.i("获取点击焦点", "获取点击焦点");
          // getImageromSdk();
          //startRun();
          new Thread(new Runnable() {

            @Override
            public void run() {
              getImageromSdk();              
            }
          }).start();
        }
      });
      return convertView;
    }

  }

}