public static String getUdiskPath(Context mContext){String pathString = null;StorageManager mStorageManager = (StorageManager) mContext.getSystemService(Context.STORAGE_SERVICE);try {Class storeManagerClazz = Class.forName("android.os.storage.StorageManager"); // 反射查找类Method getVolumesMethod = storeManagerClazz.getMethod("getVolumes");          // 反射查找方法List<?> volumeInfos = (List<?>)getVolumesMethod.invoke(mStorageManager);      // 调用方法Class volumeInfoClazz = Class.forName("android.os.storage.VolumeInfo");       // 反射查找类Method getFsUuidMethod = volumeInfoClazz.getMethod("getFsUuid");              // 反射查找方法Field pathField = volumeInfoClazz.getDeclaredField("path");                   // 查找变量if(volumeInfos != null) {for (Object volumeInfo : volumeInfos) {String uuid = (String) getFsUuidMethod.invoke(volumeInfo);            // 调用方法if (uuid != null) {Log.e(TAG, "getUdiskPath: " + uuid.toString());pathString = (String) pathField.get(volumeInfo);//U盘路径}}}}catch (Exception e){e.printStackTrace();}return pathString;}

3、播放视屏

public void onCreate() {super.onCreate();mContext = getApplicationContext();IntentFilter intentFilter = new IntentFilter();intentFilter.addAction("android.os.storage.action.VOLUME_STATE_CHANGED");registerReceiver(new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {int i = intent.getIntExtra("android.os.storage.extra.VOLUME_STATE",0);if (i != 2){Log.e(TAG, "onReceive: state is " + i);return;}// 获取ｕ盘路径String path = getUdiskPath(mContext);Log.e(TAG, "onCreate: U盘路径是：" + path);Uri videoUri = Uri.parse(path + "/test.mp4");// 启动视屏播放Intent startVideoIntent = new Intent(Intent.ACTION_VIEW, videoUri);startVideoIntent.setDataAndType(videoUri, "video/mp4");startVideoIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);startActivity(startVideoIntent);}}, intentFilter);}