This is the previous post.  

[About mp3 player](https://stackoverflow.com/questions/30914971/about-mp3-player)
And the picture below is my A.mp3 path I find in my phone.
`
![screenshot](https://i.stack.imgur.com/DuayEl.jpg)

```
  mediaPlayer.setDataSource("/storage/sdcard1/A.mp3") 

```

---

```
  File file =new   File(Environment.getExternalStorageDirectory(),"A.mp3");
  mediaPlayer.setDataSource(file.getPath());

```

---

 There are two paths above..According the picture,it should be the first one,but it does not work.
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I push A.mp3 into the internal storage,and play is ok.

```
  mediaPlayer.setDataSource("/system/A.mp3");   

```