计算文件缓冲大小getCacheDir()和getExternalCacheDir()

来源：互联网发布：激活windows后重启红屏编辑：程序博客网时间：2024/05/22 10:33

 total.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                try {                    //去计算缓存大小                    String totalCacheSize = getTotalCacheSize();                    total.setText(totalCacheSize);                } catch (Exception e) {                    e.printStackTrace();                }            }        });        clear.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //imageLoader清除缓存大小的放大//                ImageLoader.getInstance().clearDiskCache();                clearAllCache(MainActivity.this);                String totalCacheSize = null;                try {                    totalCacheSize = getTotalCacheSize();                } catch (Exception e) {                    e.printStackTrace();                }                total.setText(totalCacheSize);            }        });

 /**     * 计算app的缓存大小其实计算的是 getCacheDir()这个file和getExternalCacheDir()这个file大小的和     */    public String getTotalCacheSize() throws Exception {        long cacheSize = getFolderSize(this.getCacheDir());        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {            cacheSize += getFolderSize(this.getExternalCacheDir());        }//        File cacheDir = StorageUtils.getOwnCacheDirectory(this, "universalimageloader/Cache");        return getFormatSize(cacheSize);    }    /**     * 计算文件夹的大小     */    public static long getFolderSize(File file) throws Exception {        if (!file.exists()) {            return 0;        }        long size = 0;        try {            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;    }    /**     * 格式化得到的总大小 默认是byte,  然后根据传入的大小,自动转化成合适的大小单位     *     * @param size     * @return     */    public static String getFormatSize(double size) {        double kiloByte = size / 1024;        if (kiloByte < 1) {            return "0K";        }        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";    }    /**     * 清理app的缓存 其实是清除的getCacheDir 和getExternalCacheDir这两个文件     *     * @param context     */    public static void clearAllCache(Context context) {        deleteDir(context.getCacheDir());        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {            deleteDir(context.getExternalCacheDir());        }    }    /**     * 删除一个文件夹     *     * @param dir     * @return     */    private static boolean deleteDir(File dir) {        if (dir != null && dir.isDirectory()) {            String[] children = dir.list();            for (int i = 0; i < children.length; i++) {                boolean success = deleteDir(new File(dir, children[i]));                if (!success) {                    return false;                }            }        }        return dir.delete();    }

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