录制的音频无法在Android媒体播放器中播放？

Question

我用下面的代码将文本转换为语音。在我的代码中，我将用户输入存储为.wav格式。当我执行这段代码时，每件事情都很好，当我播放文件时它不会播放。

TTS_AudioActivity.java

public class TTS_AudioActivity extends Activity implements OnInitListener { 

    private int MY_DATA_CHECK_CODE = 0; 

    private TextToSpeech tts; 
    String destFileName = "/sdcard/wakeUp.wav"; 
    private EditText inputText; 
    private Button speakButton, listen; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     inputText = (EditText) findViewById(R.id.editText1); 
     speakButton = (Button) findViewById(R.id.button1); 
     listen = (Button) findViewById(R.id.button2); 
     speakButton.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       String text = inputText.getText().toString(); 
       if (text != null && text.length() > 0) { 

        HashMap<String, String> myHashRender = new HashMap(); 
        myHashRender.put(
          TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID, text); 
        tts.synthesizeToFile(text, myHashRender, destFileName); 

        Toast.makeText(TTS_AudioActivity.this, "Saying: " + text, 
          Toast.LENGTH_LONG).show(); 
        tts.speak(text, TextToSpeech.QUEUE_ADD, null); 
       } 
      } 
     }); 

     listen.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 

       if (!Environment.getExternalStorageState().equals(
         Environment.MEDIA_MOUNTED)) { 

       } else { 

        MediaPlayer mpPlayProgram = new MediaPlayer(); 
        try { 
         mpPlayProgram 
           .setDataSource("/sdcard/wakeUp.wav"); 
         mpPlayProgram.prepare(); 
         mpPlayProgram.start(); 
         mpPlayProgram.release(); 

        } catch (IllegalArgumentException e) { 
         // TODO Auto-generated catch block 
         e.printStackTrace(); 
        } catch (IllegalStateException e) { 
         // TODO Auto-generated catch block 
         e.printStackTrace(); 
        } catch (IOException e) { 
         // TODO Auto-generated catch block 
         e.printStackTrace(); 
        } 

       } 

       // MediaPlayer mpPlayProgram = new MediaPlayer(); 
       // try { 
       // mpPlayProgram.setDataSource(destFileName); 
       // mpPlayProgram.prepare(); 
       // mpPlayProgram.start(); 
       // mpPlayProgram.release(); 
       // 
       // } catch (IllegalArgumentException e) { 
       // // TODO Auto-generated catch block 
       // e.printStackTrace(); 
       // } catch (IllegalStateException e) { 
       // // TODO Auto-generated catch block 
       // e.printStackTrace(); 
       // } catch (IOException e) { 
       // // TODO Auto-generated catch block 
       // e.printStackTrace(); 
       // } 

       // tts.addSpeech(null, "/sdcard/wakeUp.wav"); 
      } 
     }); 

     Intent checkIntent = new Intent(); 
     checkIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA); 
     startActivityForResult(checkIntent, MY_DATA_CHECK_CODE); 

    } 

    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (requestCode == MY_DATA_CHECK_CODE) { 
      if (resultCode == TextToSpeech.Engine.CHECK_VOICE_DATA_PASS) { 
       // success, create the TTS instance 
       // tts.isLanguageAvailable(Locale.ENGLISH); 
       tts = new TextToSpeech(TTS_AudioActivity.this, this); 
      } else { 
       // missing data, install it 
       Intent installIntent = new Intent(); 
       installIntent 
         .setAction(TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA); 
       startActivity(installIntent); 
      } 
     } 

    } 

    @Override 
    public void onInit(int status) { 
     if (status == TextToSpeech.SUCCESS) { 
      Toast.makeText(TTS_AudioActivity.this, 
        "Text-To-Speech engine is initialized", Toast.LENGTH_LONG) 
        .show(); 
     } else if (status == TextToSpeech.ERROR) { 
      Toast.makeText(TTS_AudioActivity.this, 
        "Error occurred while initializing Text-To-Speech engine", 
        Toast.LENGTH_LONG).show(); 
     } 
    } 

} 

main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 

    <EditText 
     android:id="@+id/editText1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentTop="true" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="54dp" 
     android:ems="10" > 

     <requestFocus /> 
    </EditText> 

    <Button 
     android:id="@+id/button1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/editText1" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="42dp" 
     android:text="Save" /> 

    <Button 
     android:id="@+id/button2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/button1" 
     android:layout_below="@+id/button1" 
     android:layout_marginTop="32dp" 
     android:text="Play" /> 

</RelativeLayout> 

在这里，我保存在SD卡中的文件。当我从SD卡上播放文件时，它不会播放。我如何播放文件。

Answer 1

释放呼叫是问题。

你在start()之后就叫release()。 你最好呼叫释放（），当你用MediaPlayer的完成，如文档中说：http://developer.android.com/reference/android/media/MediaPlayer.html

您应仔细阅读本文档，因为MediaPlayer的是种复杂的事情（在我看来）。

顺便说一下，您应该通过使用Environment.getExternalStorageDirectory()并通过该调用的文件层次来访问您的SD卡。

Answer 2

你能评论这条线mpPlayProgram.release();并检查它是否有效。

发布方法应该在您想要发布mediaplayer而不是在播放时调用。