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;    }  }}