音频记录器的未处理异常类型IOException

Question

目前，我正在努力开发一个音频记录器在android应用程序，最终发送到在线服务器，然后被多播。然而，在我可以继续之前，我遇到了错误，如未处理的异常类型IOException。我在出现错误的地方加了一个**号。请帮助。

package com.example.testproject;
import java.io.File;
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
public class Sound extends Activity {
private MediaPlayer mediaPlayer;
private MediaRecorder recorder;
private String OUTPUT_FILE;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.audio);
    OUTPUT_FILE=Environment.getExternalStorageDirectory()+"/audiorecorder.3gpp";
}
public void buttonTapped(View view){
    switch(view.getId()){
    case R.id.btnstart:
    try {
        beginRecording();
    }catch(Exception e){
        e.printStackTrace();
    }
    break;
    case R.id.btnfinish:
    try {
        stopRecording();
    }catch(Exception e){
        e.printStackTrace();
    }
    break;
    case R.id.btnplay:
    try {
        playRecording();
    }catch(Exception e){
        e.printStackTrace();
    }
    break;
    case R.id.btnstop:
    try {
        stopPlayback();
    }catch(Exception e){
        e.printStackTrace();
    }
    break;
    }       
}
private void stopPlayback(){
}
private void playRecording() throws Exception{
    ditchMediaPlayer();
    mediaPlayer = new MediaPlayer();
    mediaPlayer.setDataSource(OUTPUT_FILE);
    mediaPlayer.prepare();
    mediaPlayer.start();
}
private void ditchMediaPlayer(){
    if(mediaPlayer != null)
    {
        try{
            mediaPlayer.release();
        }catch(Exception e)
        {
            e.printStackTrace();
        }
    }
}
private void stopRecording(){
    if(recorder != null)
        recorder.stop();
}
private void beginRecording(){
    ditchMediaRecorder();
    File outputFile = new File(OUTPUT_FILE);
    if(outputFile.exists())
        outputFile.delete();
    recorder = new MediaRecorder();
    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    recorder.setOutputFile(OUTPUT_FILE);
    **recorder.prepare();**
    recorder.start();
}
private void ditchMediaRecorder() { 
    if(recorder != null)
        recorder.release();
}
}

Answer 1

您必须处理调用recorder.prepare()时可能发生的IO错误。有关异常处理的更多信息，请参阅官方Java文档。

现在，这应该有帮助:

try {
   recorder.prepare();
   recorder.start();
} catch (IOException e) {
   e.printStackTrace();
}

但请确保在发布应用程序之前实现适当的错误处理。