安卓学习笔记获取手机内存与SD卡路径及大小

来源：互联网发布：第三方抽奖软件编辑：程序博客网时间：2024/06/08 17:44

实现原理

通过反射，调用StorageManger被隐藏接口getVolumePaths()，来获得手机的存储路径，进而通过StatFs获取区块blockCount与blockSize的大小，以计算出内存值
在使用getBlockCountLong()，getBlockSizeLong()，getAvailableBlocks()时要注意api>=18;

方法代码

/**     * 获取ROM总大小     * @param context     * @return     */    public static String getMaxRomSpace(Context context) {        StatFs fs = new StatFs(getInnerSDCardPath(context));        String romSpace;         if (Build.VERSION.SDK_INT  >=18) {            long blockCount = fs.getBlockCountLong();            long bloackSize = fs.getBlockSizeLong();            long totalSpace = bloackSize*blockCount;            romSpace = Formatter.formatFileSize(context, totalSpace);        }else{            long blockCount = fs.getBlockCount();            long bloackSize = fs.getBlockSize();            long totalSpace = bloackSize*blockCount;            romSpace = Formatter.formatFileSize(context, totalSpace);        }        return romSpace;    }

/**     * 获取SD卡总大小     * @param context     * @return     */    public static String getMaxSDSpace(Context context) {        String extPath = getExtSDCardPath(context);        if (TextUtils.isEmpty(extPath)) {            Toast.makeText(context, "无SD卡", 0).show();            return null;        }        File path = new File(extPath);        StatFs fs = new StatFs(path.getPath());        String sdSpace;        if (Build.VERSION.SDK_INT  >=18) {            long blockCount = fs.getBlockCountLong();            long bloackSize = fs.getBlockSizeLong();            long totalSpace = bloackSize*blockCount;            sdSpace = Formatter.formatFileSize(context, totalSpace);        }else{            long blockCount = fs.getBlockCount();            long bloackSize = fs.getBlockSize();            long totalSpace = bloackSize*blockCount;            sdSpace = Formatter.formatFileSize(context, totalSpace);        }        return sdSpace;    }

/**     * 获取rom可用大     * 小     * @param context     * @return     */    public static String getAvailableRomSpace(Context context) {        File path = Environment.getDataDirectory();        StatFs fs = new StatFs(path.getPath());        String Space = null ;        if (Build.VERSION.SDK_INT  >=18) {            long blockCount = fs.getAvailableBlocksLong();            long bloackSize = fs.getBlockSizeLong();            long totalSpace = bloackSize*blockCount;            Space = Formatter.formatFileSize(context, totalSpace);        }else{            long blockCount = fs.getAvailableBlocks();            long bloackSize = fs.getBlockSize();            long totalSpace = bloackSize*blockCount;            Space = Formatter.formatFileSize(context, totalSpace);        }        return Space;    }

    /**     * 获取SD卡可用大小     * @param context     * @return     */    public static String getAvailableSdSpace(Context context) {        String extPath = getExtSDCardPath(context);        if (TextUtils.isEmpty(extPath)) {            Toast.makeText(context, "无SD卡", 0).show();            return null;        }        File path = new File(extPath);        StatFs fs = new StatFs(path.getPath());        String Space;        if (Build.VERSION.SDK_INT >=18) {            long blockCount = fs.getAvailableBlocksLong();            long bloackSize = fs.getBlockSizeLong();            long totalSpace = bloackSize*blockCount;            Space = Formatter.formatFileSize(context, totalSpace);        }else{            long blockCount = fs.getAvailableBlocks();            long bloackSize = fs.getBlockSize();            long totalSpace = bloackSize*blockCount;            Space = Formatter.formatFileSize(context, totalSpace);        }        return Space;    }

    /**     * 获取外置SD卡路径     * @return  应该就一条记录或空     */    public static String getExtSDCardPath(Context context){        StorageManager sm = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);        try {            getPathsMethod = sm.getClass().getMethod("getVolumePaths", null);            String[] path = (String[]) getPathsMethod.invoke(sm, null);            return path[1];        } catch (NoSuchMethodException e) {            e.printStackTrace();        } catch (IllegalAccessException e) {            e.printStackTrace();        } catch (IllegalArgumentException e) {            e.printStackTrace();        } catch (InvocationTargetException e) {            e.printStackTrace();        }        return null;    }

    /**     * 获取内置内存路径     * @return  应该就一条记录或空     */    public static String getInnerSDCardPath(Context context){        StorageManager sm = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);        try {            getPathsMethod = sm.getClass().getMethod("getVolumePaths", null);            String[] path = (String[]) getPathsMethod.invoke(sm, null);            return path[0];        } catch (NoSuchMethodException e) {            e.printStackTrace();        } catch (IllegalAccessException e) {            e.printStackTrace();        } catch (IllegalArgumentException e) {            e.printStackTrace();        } catch (InvocationTargetException e) {            e.printStackTrace();        }        return null;    }

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