基于Piccaso的图片下载工具类封装

感谢强哥帮助修改完善~

核心下载类BitmapDownloadHelper

1.downloadSinglePic(String url, final OnDownloadResultListener listener) 下载单张图片

2.下载多张图片downloadPic(List urlList)

3.在下载多张图片时候回调接口置空

整体代码结构如下

完整代码github链接如下：

https://github.com/fengsehng/BitmapDownloadTool

public class BitmapDownloadHelper {  /**   * 用于存储返回的结果   */  private static Map<String, Boolean> sResultMap = new HashMap<>();  private static String PIC_SIZE = NewHouseConstantUtils.IMAGE_SIZE_POSTFIX.IMG_FRAME_ALBUM;  /**   * 批量下载图片   * @param urlList   */  public static void downloadPic(List<String> urlList) {    ToastUtil.toast(Entry.getContext(), "图片保存中");    for (final String url : urlList) {      downloadSinglePic(url, null);    }    toastResult(urlList.size());  }  /**   * 下载单张图片   * @param url   */  public static void downloadSinglePic(String url, final OnDownloadResultListener listener) {      }  /**   * 最终的弹出结果   * @param total   */  private static void toastResult(int total) {  }  /**   * 回调下载状态接口   */  public interface OnDownloadResultListener{    void onDownloadBegin();    void onDownloadResult(boolean success);  }}

文件处理类

1.判断指定的文件夹是否存在图片

2.图片的文件名字是经过md5处理的

3.获取系统相册的目录

代码框架如下：

/** * Created by（fengsehng） on 2017/9/19. * @author fengsehng * */public class PicFileUtil {  /**   * 相册文件夹   */  public static String PATH_PHOTOGRAPH = “/fengsehng/“;  /**   * 保存图片   *   * @param bitmap   * @param filePath   */  public static void saveBitmap(Bitmap bitmap, String filePath) {    FileOutputStream bos = null;    File file = new File(filePath);    if (!file.getParentFile().exists()) {      file.getParentFile().mkdirs();    }    try {      bos = new FileOutputStream(file);      bitmap.compress(Bitmap.CompressFormat.PNG, 100, bos);    } catch (FileNotFoundException e) {      e.printStackTrace();    } finally {      try {        bos.flush();        bos.close();      } catch (IOException e) {        e.printStackTrace();      }    }  }  public static void deleteDir(File directory) {    if (directory != null){      if (directory.isFile()) {        directory.delete();        return;      }      if (directory.isDirectory()) {        File[] childFiles = directory.listFiles();        if (childFiles == null || childFiles.length == 0) {          directory.delete();          return;        }        for (int i = 0; i < childFiles.length; i++) {          deleteDir(childFiles[i]);        }        directory.delete();      }    }  }  /**   * 获取保存到相册的最终文件   * @param filePath   * @param imageName   * @return   */  public static File getDCIMFile(String filePath, String imageName) {    if (Environment.getExternalStorageState().equals(        Environment.MEDIA_MOUNTED)) { // 文件可用      // 首先保存图片      String storePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + filePath;      File appDir = new File(storePath);      if (!appDir.exists()) {        appDir.mkdir();      }      File file = new File(appDir, imageName);      if (!file.exists()) {        try {          //在指定的文件夹中创建文件          file.createNewFile();        } catch (Exception e) {        }      }      return file;    } else {      return null;    }  }  public static File saveBitmap2(Bitmap bitmap, String fileName, File baseFile) {    FileOutputStream bos = null;    File imgFile = new File(baseFile, "/" + fileName);    try {      bos = new FileOutputStream(imgFile);      bitmap.compress(Bitmap.CompressFormat.PNG, 100, bos);    } catch (FileNotFoundException e) {      e.printStackTrace();    } finally {      try {        bos.flush();        bos.close();      } catch (IOException e) {        e.printStackTrace();      }    }    return imgFile;  }  public static File getBaseFile(String filePath) {    if (Environment.getExternalStorageState().equals(        Environment.MEDIA_MOUNTED)) { // 文件可用      File f = new File(Environment.getExternalStorageDirectory(),          filePath);      if (!f.exists())        f.mkdirs();      return f;    } else {      return null;    }  }  /**   * 由指定的路径和文件名创建文件   */  public static File createFile(String path, String name) throws IOException {    File folder = new File(path);    if (!folder.exists()) {      folder.mkdirs();    }    File file = new File(path + name);    if (!file.exists()) {      file.createNewFile();    }    return file;  }  /**   * 把url字符串转化为对应的文件   * @param urlList   * @return   */  public static HashMap<String,String> getMd5List(List<String> urlList){    HashMap<String,String> map = new HashMap<>();    for(int i= 0; i < urlList.size();i++){      map.put(Md5Util.getMd5(urlList.get(i)) + ".jpg",urlList.get(i));    }    return map;  }  /**   * 过滤已经存在的md5文件   * @param urlList   * @return   */  public static List<String> getResultList(List<String> urlList){    HashMap<String,String> map = new HashMap<>();    map = getMd5List(urlList);    List<String> fileNameList = new ArrayList<>();    for(Map.Entry<String,String> entry:map.entrySet()){      fileNameList.add(entry.getKey());    }    String storePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + PicFileUtil.PATH_PHOTOGRAPH;    File appDir = new File(storePath);    if (!appDir.exists()) {      appDir.mkdir();    }    File[] fileList = appDir.listFiles();    Iterator<String> it = fileNameList.iterator();    while(it.hasNext()){      String x = it.next();      for(File f:fileList){        if(x.equals(f.getName())){          map.remove(x);        }      }    }    List<String> resultUrlList = new ArrayList<>();    for(Map.Entry<String,String> entry:map.entrySet()){      resultUrlList.add(entry.getValue());    }    return resultUrlList;  }  /**   * 图片是否存在   * @param fileName   * @return   */  public static boolean isFileExit(String fileName){    String storePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + PicFileUtil.PATH_PHOTOGRAPH;    File appDir = new File(storePath);    if (!appDir.exists()) {      appDir.mkdir();    }    File[] files = appDir.listFiles();    for (File file: files) {      if (fileName.equals(file.getName())){        return true;      }    }    return false;  }}

完整代码链接：

https://github.com/fengsehng/BitmapDownloadTool