Android上原始文件夹和SD卡之间的MediaPlayer问题 [英] MediaPlayer issue between raw folder and sdcard on android

问题描述

我正在制作一个用于使用搜索栏播放歌曲的应用程序.如果我从原始文件夹中播放，则可以正常播放，但如果我从sdcard中播放歌曲，则显示为空指针异常.

I am making an app for playing songs with a seek bar. If I play from the raw folder it works but if I play a song from the sdcard it shows a null pointer exception.

private MediaPlayer mediaPlayer;
mediaPlayer = MediaPlayer.create(this, R.raw.t1); // it works

//  switch to sdcard
mediaPlayer.setDataSource("/sdcard/t1.mp3"); // null pointer exception.

我不知道这是什么问题.请帮助我.

I do not know what is the problem. Please help me.

推荐答案

您需要确保提供给setDataSource()的路径 是完全正确的最好的方法是使用android.os.Environment.getExternalStorageDirectory()

You need to make sure the path you give to setDataSource() is exactly correct. The best way to do this, instead of hardcoding the reference to '/sdcard/', is to use android.os.Environment.getExternalStorageDirectory()

尝试一下，我认为它将为您提供帮助

Try this, I think it will help you

MediaPlayer mediaPlayer = new MediaPlayer();
File path = android.os.Environment.getExternalStorageDirectory();
mediaPlayer.setDataSource(path + "/t1.mp3");

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