android實(shí)現(xiàn)清理緩存功能

/**
 * 獲取app的緩存大小
 * 1. 錄制的視頻/storage/emulated/0/xueliangapp/video/1573972925136.mp4
 * 2. 錄制的音頻/storage/emulated/0/xueliangapp/radio/1573972925136.amr
 * 3. 下載的更新包/storage/emulated/0/Android/data/com.sdxzt.xueliangapp_v3/files/Download/xueliang_update.apk
 * 4. 緩存/storage/emulated/0/Android/data/com.sdxzt.xueliangapp_v3/cache
*/
  File videoDir,radioDir,filesDir,cacheDir;
  private String getAppCache(){
    long fileSize = 0;
    String cacheSize = "0KB";
    videoDir = new File(Environment.getExternalStorageDirectory()+"/xueliangapp/video");
    Log.d(TAG, "getAppCache: videoDir大小: "+getDirSize(videoDir));
    radioDir = new File(Environment.getExternalStorageDirectory()+"/xueliangapp/radio");
    Log.d(TAG, "getAppCache: radioDir大小: "+getDirSize(radioDir));
    filesDir = getActivity().getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS);
    Log.d(TAG, "getAppCache: filesDir大小: "+getDirSize(filesDir));
    ///storage/emulated/0/Android/data/com.sdxzt.xueliangapp_v3/files,這里面有download文件夾,里面是下載的更新包
    cacheDir = getActivity().getExternalCacheDir();
    Log.d(TAG, "getAppCache: cacheDir大小: "+getDirSize(cacheDir));
    ///storage/emulated/0/Android/data/com.sdxzt.xueliangapp_v3/cache
    fileSize += getDirSize(getActivity().getFilesDir());
    fileSize += getDirSize(getActivity().getCacheDir());//這行是默認(rèn)的緩存地址,看圖片什么的會(huì)在這里積累緩存
    fileSize += getDirSize(videoDir);
    fileSize += getDirSize(radioDir);
    fileSize += getDirSize(filesDir);
    fileSize += getDirSize(cacheDir);
    String fileSizeStr = formatFileSize(fileSize);
    Log.d(TAG, "getAppCache: 總緩存大小: "+fileSizeStr);
    return fileSizeStr;
  }

  /**
   * 獲取文件大小(字節(jié)為單位)
   * @param dir
   * @return
   */
  private long getDirSize(File dir) {
    if (dir == null) {
      return 0;
    }
    if (!dir.isDirectory()) {
      return 0;
    }
    long dirSize = 0;
    File[] files = dir.listFiles();
    for (File file : files) {
      if (file.isFile()) {
        dirSize += file.length();//文件的長(zhǎng)度就是文件的大小
      } else if (file.isDirectory()) {
        dirSize += file.length();
        dirSize += getDirSize(file); // 遞歸調(diào)用繼續(xù)統(tǒng)計(jì)
      }
    }
    return dirSize;
  }

  /**
   * 格式化文件長(zhǎng)度
   * @param fileSize
   * @return
   */
  private String formatFileSize(long fileSize){
    DecimalFormat df = new DecimalFormat("#0.00");//表示小數(shù)點(diǎn)前至少一位,0也會(huì)顯示,后保留兩位

    String fileSizeString = "";
    if (fileSize < 1024) {
      fileSizeString = df.format((double) fileSize) + "B";
    } else if (fileSize < 1048576) {
      fileSizeString = df.format((double) fileSize / 1024) + "KB";
    } else if (fileSize < 1073741824) {
      fileSizeString = df.format((double) fileSize / 1048576) + "MB";
    } else {
      fileSizeString = df.format((double) fileSize / 1073741824) + "G";
    }
    return fileSizeString;
  }
  private void setAppCache() {
    String fileSize = getAppCache();
    fileSizeTv.setText(fileSize);
    Log.d(TAG, "setAppCache: 重新顯示緩存大小");
    Log.d(TAG, "setAppCache: 當(dāng)前緩存"+fileSize);
  }

  public void clearAppCache(final Activity activity){

    final Handler handler = new Handler(){
      @Override
      public void handleMessage(@NonNull Message msg) {
        super.handleMessage(msg);
        Log.d(TAG, "handlerMessage: ");
        if (msg.what == 1) {
          setAppCache();
          Log.d(TAG, "handlerMessage: 緩存清除完畢");
          ToastUtil.showMsg(getActivity(),"緩存清除完畢");
        }else {
          ToastUtil.showMsg(getActivity(),"緩存清除失敗");
          Log.d(TAG, "handlerMessage: 緩存清除失敗");
        }
      }
    };

    new Thread(new Runnable() {
      @Override
      public void run() {
        Log.d(TAG, "run: ");
        Message msg = new Message();
        try {
          clearCacheFolder(videoDir,System.currentTimeMillis());
          clearCacheFolder(radioDir,System.currentTimeMillis());
          clearCacheFolder(filesDir,System.currentTimeMillis());
          clearCacheFolder(cacheDir,System.currentTimeMillis());
          msg.what = 1;
        }catch (Exception e){
          e.printStackTrace();
          msg.what = -1;
        }
        handler.sendMessage(msg);
      }
    }).start();
  }


  /**
   * 清除緩存目錄
   * @param dir 目錄
   * @param curTime 當(dāng)前系統(tǒng)時(shí)間
   */
  private int clearCacheFolder(File dir,long curTime){
    int deletedFiles = 0;
    if (dir!= null && dir.isDirectory()) {
      try {
        for (File child:dir.listFiles()) {
          if (child.isDirectory()) {
            deletedFiles += clearCacheFolder(child, curTime);
          }
          if (child.lastModified() < curTime) {
            if (child.delete()) {
              deletedFiles++;
            }
          }
        }
      } catch(Exception e) {
        e.printStackTrace();
      }
    }
    Log.d(TAG, "clearCacheFolder: 清除目錄: "+dir.getAbsolutePath());
    return deletedFiles;
 }