手机存储路径问题

今天项目一个问题涉及了手机文件存储，特此记录一下

一般手机存储分为 内部存储 和外部存储

内部存储路径获取方式有两种

String url = Environment.getExternalStorageDirectory() + File.separator + "ceshi" + File.separator + "08ea24f490532d2e4d7c69e8b69a8f01.m3u8.sqlite";
Log.e("TAG", "onCreate:------------ " + url);

final File externalStorageDirectory = Environment.getExternalStorageDirectory();
final File ceshi = new File(externalStorageDirectory, "ceshi");
Log.e("TAG", "onCreate:++++++++++++ " + ceshi + File.separator + "08ea24f490532d2e4d7c69e8b69a8f01.m3u8.sqlite");

File directory_pictures = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
Log.e("TAG", "onCreate:------------ " + directory_pictures + File.separator + "08ea24f490532d2e4d7c69e8b69a8f01.m3u8.sqlite");

一二都是同一种的不同写法

第二种方法是一个更加方便的访问Android给我们提供好的一些公共目录的方法，第一种方式更加灵活，可以自己指定目录

外部存储又分为SD卡和扩展卡内存

扩展内存就是我们插入的外置SD卡，获取扩展内存的路径有点难度，不过Google很牛逼，哈哈，代码如下：

private 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");
        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);
            if (removable) {
                return path;
            }
        }
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    }
    return null;
}

测试路径

Log.e("TAG", "外置SD卡路径 = " + getExtendedMemoryPath(this));
Log.e("TAG", "内置SD卡路径 = " + Environment.getExternalStorageDirectory().getAbsolutePath());
Log.e("TAG", "手机内存根目录路径  = " + Environment.getDataDirectory().getParentFile().getAbsolutePath());