获得 sdcard 空间。

FSUtil.java

package com.ilegendsoft.toprankapps.tubeplayer.utils;

import android.os.Environment;
import android.os.StatFs;

public class FSUtil {
	// One binary gigabyte equals 1,073,741,824 bytes.
	private static final long PER_G_NUM = 1073741824;

	public static String getAvailableSpace() {
		if (Environment.MEDIA_MOUNTED.equals(Environment
				.getExternalStorageState())) {

			StatFs stat = new StatFs(Environment.getExternalStorageDirectory()
					.getPath());
			// another method , can use
			// Environment.getExternalStorageDirectory().getUsableSpace()
			double sdAvailSize = (double) stat.getAvailableBlocks()
					* (double) stat.getBlockSize();
			if (sdAvailSize <= PER_G_NUM) {
				double mAvailable = sdAvailSize * 1024 / PER_G_NUM;
				return mAvailable + " M";
			} else {
				double gigaAvailable = sdAvailSize / PER_G_NUM;
				return gigaAvailable + " G";
			}
		}
		return null;
	}

	public static int getPercentage() {
		if (Environment.MEDIA_MOUNTED.equals(Environment
				.getExternalStorageState())) {
			StatFs stat = new StatFs(Environment.getExternalStorageDirectory()
					.getPath());
			long sdTotalSize = stat.getBlockCount();
			long sdAvailSize = stat.getAvailableBlocks();

			return (int) (sdAvailSize * 100 / sdTotalSize);
		}
		return 0;
	}

}