android - 如何在本地/默认媒体播放器上播放 raw/assets 文件夹中的音频文件？

Question

我知道我可以像这样在媒体播放器中播放 mp3 文件:

Intent intent = new Intent();  
intent.setAction(android.content.Intent.ACTION_VIEW);  
File file = new File(YOUR_SONG_URI);  
intent.setDataAndType(Uri.fromFile(file), "audio/*");  
startActivity(intent);

正在关注 this link我试着像这样获取 URI:

Uri audio = Uri.parse("android.resource://com.audio.test/"+R.raw.audio1);
Log.d(TAG,"uri:"+audio.toString());

和

Uri audio = Uri.parse("android.resource://com.audio.test/raw/audio");
Log.d(TAG,"uri:"+audio.toString());

输出预期结果:

01-24 15:28:23.190: D/MyClass(30234): uri:android.resource://com.audio.test/2131034112
01-24 15:29:13.: D/MyClass(30234): uri:android.resource://com.audio.test/raw/audio1

但它不起作用。媒体播放器不启动。有什么想法吗？

更新

我包含了一个 createChooser，但我收到了“无法找到执行此操作的应用程序”消息，而不是预期的玩家列表。这是我的确切代码:

 public void playAudio(){
          Intent viewMediaIntent = new Intent();   
          viewMediaIntent.setAction(android.content.Intent.ACTION_VIEW);        
          Uri audio = Uri.parse("android.resource://com.audio.test/raw/"+R.raw.audio1);       
          Log.d(TAG,"uri:"+audio.toString());
          viewMediaIntent.setDataAndType(audio, "video/*");   
          viewMediaIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
          Log.d(TAG,"Starting");
          Intent i = Intent.createChooser(viewMediaIntent, "Play Music");
            mGap.startActivity(i);
          Log.d(TAG,"Started");
      }

更新 2

感谢@CommonsWare 的解释。现在我明白为什么它不起作用了。但问题依然存在，我能达到我想要的吗？使用 file://方案获取存储在 raw/assets 文件夹中的文件的 Uri？

更新 3

我找到了一种方法，尽管它不是最好的方法。我只有 3 个文件，这根本不会延迟执行。我正在将文件从 res/raw 复制到手机上的本地目录并从该文件获取 Uri。如有任何关于如何避免该步骤的建议，我们将不胜感激。

 public void copyFileToDir(String audioFile){
          File test = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC + "/" + audioFile + ".mp3");
          if (test.exists()){
              Toast.makeText(mGap, "Exists", Toast.LENGTH_SHORT).show();
              return;
          }
          File dest = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC);
          int i = mGap.getResources().getIdentifier("raw/"+audioFile, "string", mGap.getPackageName());
          InputStream in = mGap.getResources().openRawResource(i);
          // Used the File-constructor
          OutputStream out;
        try {
            out = new FileOutputStream(new File(dest, audioFile + ".mp3"));
              // Transfer bytes from in to out
              byte[] buf = new byte[1024];
              int len;
              try {
                  // A little more explicit
                  while ( (len = in.read(buf, 0, buf.length)) != -1){
                       out.write(buf, 0, len);
                  }
              } finally {
                  // Ensure the Streams are closed:
                  in.close();
                  out.close();
              }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 


      }


      public void playAudio(String audioFile){
          copyFileToDir(audioFile);
          File dest = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC + "/" + audioFile + ".mp3");
          Uri r = Uri.fromFile(dest);         
          Intent viewMediaIntent = new Intent();   
          viewMediaIntent.setAction(android.content.Intent.ACTION_VIEW);                                 
          viewMediaIntent.setDataAndType(r, "audio/*");   
          viewMediaIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);          
          Intent i = Intent.createChooser(viewMediaIntent, "Play Music");
            mGap.startActivity(i);

      }

      public void playVideo(String movieurl){
          Intent intentToPlayVideo = new Intent(Intent.ACTION_VIEW);
          intentToPlayVideo.setDataAndType(Uri.parse(movieurl), "video/*");
          Log.d(TAG,"Playing:" + movieurl);
          mGap.startActivity(intentToPlayVideo);
      }

Answer 1

为什么不直接使用 MediaPlayer？可以直接传资源id

int resourceId = R.raw.your_media_resource;
MediaPlayer mediaPlayer = MediaPlayer.create( context, resourceId );
mediaPlayer.setOnCompletionListener( new OnCompletionListener()
{
    @Override
    public void onCompletion( MediaPlayer mp )
    {
        mp.release();
    }
} );
mediaPlayer.start();