Android關於獲取是否有外置sd卡以及內存使用情況的那些事兒

今天爲大家分享下關於內存的事兒
可能很久之前，我們的獲取是否有 外置內存是這樣的（是否有sd卡以及sd卡相關內存信息）？

public static StatFs getSDMemory(Context context) {
    StatFs statfs = null;
    //判斷是否有插入存儲卡
    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
        //取得sdcard文件路徑
        File path = Environment.getExternalStorageDirectory();
        statfs = new StatFs(path.getPath());
        //獲取block的SIZE
    }


    return statfs;
}

由上面可知，(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED) 這個即可獲取是否有sd卡 。

但是到現在，毫無反應了 有木有！！！

變成了這樣 ：

public  static String getExtendedMemoryPath(Context mContext) {
    StorageManager mStorageManager = (StorageManager) mContext.getSystemService(Context
            .STORAGE_SERVICE);
    Class<?> storageVolumeClazz = null;
    try {
        storageVolumeClazz = Class.forName("android.os.storage.StorageVolume");
        Method getVolumeList = mStorageManager.getClass().getMethod("getVolumeList");
        Method getPath = storageVolumeClazz.getMethod("getPath");
        Method isRemovable = storageVolumeClazz.getMethod("isRemovable");
        Method getDescription = storageVolumeClazz.getMethod("getDescription", Context.class);
        Object result = getVolumeList.invoke(mStorageManager);
        final int length = Array.getLength(result);
        for (int i = 0; i < length; i++) {
            Object storageVolumeElement = Array.get(result, i);
            String path = (String) getPath.invoke(storageVolumeElement);
            boolean removable = (Boolean) isRemovable.invoke(storageVolumeElement);
            String descprition = (String) getDescription.invoke(storageVolumeElement, mContext);
            if (removable && descprition.contains("SD")) {
                return path;
            }
        }
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    }
    return null;
}

好了。差不多就是樣子了。通過反射去拿這個isRemovable值，這個值代表是否有sd卡了。