Question

我正在开发一个应用程序，您可以在其中录制音频剪辑，将其上传到Parse.com上的数据库，然后从Parse.com检索音频剪辑并进行播放。

我能够在Parse.com上录制和上传音频文件，但我不知道如何处理最后一步！在这里，您可以看到我如何在Parse.com上保存和存储音频片段：

byte[] data = outputFile.getBytes();
       //ParseUser currentUser = ParseUser.getCurrentUser();
       //String usernameText = currentUser.getUsername();
       Calendar c = Calendar.getInstance(); 
       String mUploadName = c.get(Calendar.SECOND) + "_recording.mp3";
       ParseFile file = new ParseFile(mUploadName, data);
       file.saveInBackground();
       // _PostStructure is the class where I've wrote the "set" and "get" methods to use the database on Parse.com
       _PostStructure new_audiofile = new _PostStructure();
       new_audiofile.setAudioFile(file);
       new_audiofile.saveInBackground();

这是我尝试从Parse.com检索和播放音频片段：

mediaPlayer = new MediaPlayer();
       ParseQuery<ParseObject> query = ParseQuery.getQuery("MyClass");
       query.getInBackground("jZAetQnISj", new GetCallback<ParseObject>() {

            public void done(ParseObject recording, com.parse.ParseException e) {
                   if (e != null) { 
                       //do nothing
                   }
                   else {
                        ParseFile audioFile = recording.getParseFile("AudioFile"); 
                        String audioFileURL = audioFile.getUrl();
                        mediaPlayer = new MediaPlayer();
                        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                        try {
                            mediaPlayer.setDataSource(audioFileURL);
                            mediaPlayer.prepare();
                              mediaPlayer.start();
                              text.setText("Recording Point: Playing");

                              finalTime = mediaPlayer.getDuration();
                              startTime = mediaPlayer.getCurrentPosition();
                              if(oneTimeOnly == 0){
                                 seekbar.setMax((int) finalTime);
                                 oneTimeOnly = 1;
                              } 

                              endTimeField.setText(String.format("%d min, %d sec", 
                                 TimeUnit.MILLISECONDS.toMinutes((long) finalTime),
                                 TimeUnit.MILLISECONDS.toSeconds((long) finalTime) - 
                                 TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.
                                 toMinutes((long) finalTime)))
                              );
                              startTimeField.setText(String.format("%d min, %d sec", 
                                 TimeUnit.MILLISECONDS.toMinutes((long) startTime),
                                 TimeUnit.MILLISECONDS.toSeconds((long) startTime) - 
                                 TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.
                                 toMinutes((long) startTime)))
                              );
                              seekbar.setProgress((int)startTime);
                              myHandler.postDelayed(UpdateSongTime,100);
                              pauseButton.setEnabled(true);
                              playButton.setEnabled(false);
                        } catch (IllegalArgumentException e1) {
                            // TODO Auto-generated catch block
                            e1.printStackTrace();
                        } catch (SecurityException e1) {
                            // TODO Auto-generated catch block
                            e1.printStackTrace();
                        } catch (IllegalStateException e1) {
                            // TODO Auto-generated catch block
                            e1.printStackTrace();
                        } catch (IOException e1) {
                            // TODO Auto-generated catch block
                            e1.printStackTrace();
                        }        
                    }
            }
       });

因此，当我录制音频片段并将其保存在Parse.com上时，一切正常。当我触摸＆＃34;播放＆＃34;按钮，应用程序不会崩溃，但没有播放声音。你能帮我找到错误吗？

Answer 1

最后我得到了解决方案！ :)这是我的错误：

       byte[] data = outputFile.getBytes();

我试图转换为字节数组（outputFile）的对象不是mp3文件，而是文件的资源路径（/storage/sdcard0/audiocapturetest.mp3），所以它基本上是一个字符串！<如果你想在Parse.com上保存一个mp3文件，这是正确的代码：

       FileInputStream fileInputStream = null;
       File fileObj = new  File(outputFile);
       byte[] data = new byte[(int) fileObj.length()];

       try {
           //convert file into array of bytes
        fileInputStream = new FileInputStream(fileObj);
        fileInputStream.read(data);
        fileInputStream.close();
       } catch(Exception e) {
        e.printStackTrace();
       }

       Calendar c = Calendar.getInstance(); 
       mUploadName = c.get(Calendar.SECOND) + "_recording.mp3";
       ParseFile file = new ParseFile(mUploadName, data);
       file.saveInBackground();
       _PostStructure new_audiofile = new _PostStructure();
       new_audiofile.setNome(mUploadName);
       new_audiofile.setAudioFile(file);
       new_audiofile.saveInBackground();

我希望它对你有所帮助！：）

编辑
我在github上传了一个示例，您可以在https://github.com/fullwipe/ParseAudioFileExample找到它

如何从Parse.com检索和播放mp3文件

1 个答案: