usb 和 sdcard 存储路径
原本原厂获取路径逻辑是通过系统属性获取。
sdcard_path = System.getenv(“SECOND_VOLUME_STORAGE”);
usb_path= System.getenv(“THIRD_VOLUME_STORAGE”);
打印出来是null，就用apk获取设备存储路径的方式
1.引用

// An highlighted block
import java.lang.reflect.*;

2.调用

// An highlighted block
sdcard_path = getStoragePath(FirstRun.this,"SD 卡");
usb_path = getStoragePath(FirstRun.this,"U 盘");

3.实现逻辑

// An highlighted block
	public static String getStoragePath(Context context,String key) {
		String targetpath = "";
		StorageManager mStorageManager = (StorageManager) context
				.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");
			Object result = getVolumeList.invoke(mStorageManager);
			final int length = Array.getLength(result);
			Method getUserLabel = storageVolumeClazz.getMethod("getUserLabel");
			for (int i = 0; i < length; i++) {
				Object storageVolumeElement = Array.get(result, i);
				String userLabel = (String) getUserLabel.invoke(storageVolumeElement);
				String path = (String) getPath.invoke(storageVolumeElement);
				if(userLabel.contains(key)){
					targetpath= path;
				}
			}
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (InvocationTargetException e) {
			e.printStackTrace();
		} catch (NoSuchMethodException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		}
		return targetpath;
	}