Android(安卓)获取内存、内部存储、外部存储空间大小

转自:http://blog.csdn.net/u013718120/article/details/50265643
今天贴一个工具类，主要是获取RAM、ROM、SDCARD空间大小的还有转换帮助方法。直接上代码，一看便知。哈哈
package com.mob.getsdandphone;import java.io.BufferedReader;import java.io.File;import java.io.FileReader;import java.io.IOException;import java.text.DecimalFormat;import android.app.ActivityManager;import android.content.Context;import android.os.Environment;import android.os.StatFs;public class FileSizeUtil {    private static final int ERROR = -1;    /**     * SDCARD是否存     */    public static boolean externalMemoryAvailable() {        return android.os.Environment.getExternalStorageState().equals(                android.os.Environment.MEDIA_MOUNTED);    }    /**     * 获取手机内部剩余存储空间     *      * @return     */    public static long getAvailableInternalMemorySize() {        File path = Environment.getDataDirectory();        StatFs stat = new StatFs(path.getPath());        long blockSize = stat.getBlockSize();        long availableBlocks = stat.getAvailableBlocks();        return availableBlocks * blockSize;    }    /**     * 获取手机内部总的存储空间     *      * @return     */    public static long getTotalInternalMemorySize() {        File path = Environment.getDataDirectory();        StatFs stat = new StatFs(path.getPath());        long blockSize = stat.getBlockSize();        long totalBlocks = stat.getBlockCount();        return totalBlocks * blockSize;    }    /**     * 获取SDCARD剩余存储空间     *      * @return     */    public static long getAvailableExternalMemorySize() {        if (externalMemoryAvailable()) {            File path = Environment.getExternalStorageDirectory();            StatFs stat = new StatFs(path.getPath());            long blockSize = stat.getBlockSize();            long availableBlocks = stat.getAvailableBlocks();            return availableBlocks * blockSize;        } else {            return ERROR;        }    }    /**     * 获取SDCARD总的存储空间     *      * @return     */    public static long getTotalExternalMemorySize() {        if (externalMemoryAvailable()) {            File path = Environment.getExternalStorageDirectory();            StatFs stat = new StatFs(path.getPath());            long blockSize = stat.getBlockSize();            long totalBlocks = stat.getBlockCount();            return totalBlocks * blockSize;        } else {            return ERROR;        }    }    /**     * 获取系统总内存     *      * @param context 可传入应用程序上下文。     * @return 总内存大单位为B。     */    public static long getTotalMemorySize(Context context) {        String dir = "/proc/meminfo";        try {            FileReader fr = new FileReader(dir);            BufferedReader br = new BufferedReader(fr, 2048);            String memoryLine = br.readLine();            String subMemoryLine = memoryLine.substring(memoryLine.indexOf("MemTotal:"));            br.close();            return Integer.parseInt(subMemoryLine.replaceAll("\\D+", "")) * 1024l;        } catch (IOException e) {            e.printStackTrace();        }        return 0;    }    /**     * 获取当前可用内存，返回数据以字节为单位。     *      * @param context 可传入应用程序上下文。     * @return 当前可用内存单位为B。     */    public static long getAvailableMemory(Context context) {        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);        ActivityManager.MemoryInfo memoryInfo = new ActivityManager.MemoryInfo();        am.getMemoryInfo(memoryInfo);        return memoryInfo.availMem;    }    private static DecimalFormat fileIntegerFormat = new DecimalFormat("#0");    private static DecimalFormat fileDecimalFormat = new DecimalFormat("#0.#");    /**     * 单位换算     *      * @param size 单位为B     * @param isInteger 是否返回取整的单位     * @return 转换后的单位     */    public static String formatFileSize(long size, boolean isInteger) {        DecimalFormat df = isInteger ? fileIntegerFormat : fileDecimalFormat;        String fileSizeString = "0M";        if (size < 1024 && size > 0) {            fileSizeString = df.format((double) size) + "B";        } else if (size < 1024 * 1024) {            fileSizeString = df.format((double) size / 1024) + "K";        } else if (size < 1024 * 1024 * 1024) {            fileSizeString = df.format((double) size / (1024 * 1024)) + "M";        } else {            fileSizeString = df.format((double) size / (1024 * 1024 * 1024)) + "G";        }        return fileSizeString;    }}
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