安卓MediaPlayer.Create（）返回null [英] Android MediaPlayer.Create() returns null

问题描述

我开发一个Android应用程序，播放一些声音。对于我创建的MediaPlayer的对象。下面是code：

I am developing an Android App that plays some sounds. For that I am creating an object of MediaPlayer. Below is the code:

mp = MediaPlayer.create(this, R.raw.testSound);

下面MP是Android 2.3.3（API等级10）空，我想与其他版本的Andr​​oid（2.1，2.2等）的正常工作。不过与Android 2.3.3（API等级10）MediaPlayer.create（）调用返回null。

Here mp is null for Android 2.3.3 (API Level 10), i tried with other versions of Android (2.1, 2.2 etc.) it works fine. However with Android 2.3.3 (API Level 10) MediaPlayer.create() call returns null.

声音文件（testSound.wav）是一个wav文件。我试图解析wav文件，看看它是不是被损坏。这似乎只是罚款。 另外，我可以使用Windows Media Player播放这个声音文件。

The sound file (testSound.wav) is a wav file. I tried parsing the wav file to see if it is corrupted or not. It seems just fine. Also, I could play this sound file using Windows Media Player.

下面是testSound.wav文件： testSound.wav 及以下为code详细

Here's the testSound.wav file: testSound.wav and below is the code in detail:

public MediaPlayer mp;

// OnCreate() funciton
mp = MediaPlayer.create(this, R.raw.testSound);
if(mp == null)   // mp is null for Android 2.3.3 on real device and on AVD both
  {
  Toast msg = Toast.makeText(getApplicationContext(), "Could not play sound",         
  Toast.LENGTH_LONG);
  msg.show();
  }

//SetMediaFileToPlay() is called on Click event of button
void SetMediaFileToPlay() 
{       
    AssetFileDescriptor afd;     
    Resources res = getResources();
    Log.d("In SetMediaFileToPlay %s", g_strFocusedImage.toString());
    switch (g_strFocusedImage)
    {
      case RESID_ALPHA1:
      afd = res.openRawResourceFd(R.raw.ik);
      if(mp != null)
      {
        mp.reset();
        mp.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(),      
        afd.getLength());
      }  
      break;
      .........  //other cases
   }

 if(mp != null)
  {
    mp.prepare();
    mp.start();
  }

}

请帮忙。谢谢你。

推荐答案

您的文件使用WAVE 8,000Hz MP3 8 kbit / s的格式，而Android仅支持8位和16位线性PCM：的 http://developer.android.com/guide/appendix/media-formats.html 。

Your file uses WAVE 8,000Hz MP3 8 kbit/s format, while android supports only 8- and 16-bit linear PCM: http://developer.android.com/guide/appendix/media-formats.html.

尝试修复您的文件。

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