Android 获取缓存大小及清除

获取缓存的方法：

// 递归
	public static long getFileSize(File f) throws Exception// 取得文件夹大小
	{
		long size = 0;
		File flist[] = f.listFiles();
		for (int i = 0; i < flist.length; i++) {
			if (flist[i].isDirectory()) {
				size = size + getFileSize(flist[i]);
			} else {
				size = size + flist[i].length();
			}
		}
		return size;
	}

	public static String FormetFileSize(long fileS) {// 转换文件大小
		if(fileS == 0){
			return "0KB";
		}
		DecimalFormat df = new DecimalFormat("#.00");
		String fileSizeString = "";
		if (fileS < 1024) {
			fileSizeString = df.format((double) fileS) + "B";
		} else if (fileS < 1048576) {
			fileSizeString = df.format((double) fileS / 1024) + "K";
		} else if (fileS < 1073741824) {
			fileSizeString = df.format((double) fileS / 1048576) + "M";
		} else {
			fileSizeString = df.format((double) fileS / 1073741824) + "G";
		}
		return fileSizeString;
	}

获取缓存数据大小：

String cacheFileSizeString = FormetFileSize(getFileSize(getCacheDir())
					+ getFileSize(getExternalCacheDir()));

清除缓存是调用下面两个方法即可:

public static boolean trimCache(Context context) {
        try {
           File dir = context.getCacheDir();
           if (dir != null && dir.isDirectory() && dir.listFiles().length != 0) {
              return deleteDir(dir);
           } else {
        	   return false;
           }
        } catch (Exception e) {
        	e.printStackTrace();
        	return false;
        }
    }
	
	public static boolean trimExternalCache(Context context) {
		try {
			File dir = context.getExternalCacheDir();
			if (dir != null && dir.isDirectory() && dir.listFiles().length != 0) {
				return deleteDir(dir);
			} else {
				return false;
			}
		} catch (Exception e) {
			e.printStackTrace();
			return false;
		}
	}
	
	public 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();
	}