(转）android 获取缓存大小 删除缓存

转自：http://lanaiver6291.blog.163.com/blog/static/177798310201493010622571/

 

//获取文件夹大小

    private long getFolderSize(java.io.File file) throws Exception {
        long size = 0;
        try {
            java.io.File[] fileList = file.listFiles();
            for (int i = 0; i < fileList.length; i++) {

//如果下面还有文件
                if (fileList[i].isDirectory()) {
                    size = size + getFolderSize(fileList[i]);
                } else {
                    size = size + fileList[i].length();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return size;
    }

    //一般android的缓存地址/data/data//cache 
    //this.getCacheDir() 就是 /data/data//cache 
    //long cacheSzie = getFolderSize(this.getCacheDir());

    /**还有一部分数据放在SD卡中
    Context.getExternalFilesDir()-->SDCard/Android/data/你的应用的包名/files/目录，一般放一些长时间保存的数据
    Context.getExternalCacheDir()-->SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据

    上面二个目录分别对应 设置
    ->应用->应用详情里面的”清除数据“与”清除缓存“选项
    */
    /**
     * 删除指定目录下文件及目录
     *
     * @param deleteThisPath
     * @param filepath
     * @return
     */
    public void deleteFolderFile(String filePath, boolean deleteThisPath) {
        if (!TextUtils.isEmpty(filePath)) {
            try {
                File file = new File(filePath);
                if (file.isDirectory()) {// 如果下面还有文件
                    File files[] = file.listFiles();
                    for (int i = 0; i < files.length; i++) {
                        deleteFolderFile(files[i].getAbsolutePath(), true);
                    }
                }
                if (deleteThisPath) {
                    if (!file.isDirectory()) {// 如果是文件，删除
                        file.delete();
                    } else {// 目录
                        if (file.listFiles().length == 0) {// 目录下没有文件或者目录，删除
                            file.delete();
                        }
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    //单位转换String size = getFormatSize(cacheSzie);

    /**
     * 格式化单位
     *
     * @param size
     * @return
     */
    private String getFormatSize(double size) {
        double kiloByte = size / 1024;
        if (kiloByte < 1) {
            return size + "Byte";
        }

        double megaByte = kiloByte / 1024;
        if (megaByte < 1) {
            BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
            return result1.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "KB";
        }

        double gigaByte = megaByte / 1024;
        if (gigaByte < 1) {
            BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
            return result2.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "MB";
        }

        double teraBytes = gigaByte / 1024;
        if (teraBytes < 1) {
            BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
            return result3.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "GB";
        }
        BigDecimal result4 = new BigDecimal(teraBytes);
        return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()
                + "TB";
    }