我开发录制音频应用程序，其中录制存储在sdcard.i第一次获得成功录制声音但是（如点击录制按钮开始录制并点击停止按钮它将停止）现在问题是第二次提出。如果我点击记录按钮，它将退出应用程序。
我已附上 recordign file ::
package com.SaxParser2;
import java.io.File;
import java.io.IOException;
import java.util.Calendar;
import java.util.Date;
import java.util.Random;
import android.media.MediaRecorder;
import android.os.Environment;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
public class AudioRecorder {
final MediaRecorder recorder = new MediaRecorder();
final String path;
final Random myRandom = new Random();
String currentDateTimeString = DateFormat.getDateInstance().format(new Date());
/**
* Creates a new audio recording at the given path (relative to root of SD card).
*/
public AudioRecorder(String path) {
this.path = sanitizePath(path);
}
public String sanitizePath(String path) {
if (!path.startsWith("/")) {
path = "/" + path;
}
if (!path.contains(".")) {
Calendar c = Calendar.getInstance();
System.out.println("Current time => "+c.getTime());
int strHour = c.get(Calendar.HOUR);
int strSecond = c.get(Calendar.SECOND);
int strMinute = c.get(Calendar.MINUTE);
int strMonth = c.get(Calendar.MONTH);
int strYear = c.get(Calendar.YEAR);
int strDay = c.get(Calendar.DAY_OF_MONTH);
path += String.valueOf(myRandom.nextInt())+""+strSecond+strMinute+strDay+strMonth+strYear+".mp3";
}
return Environment.getExternalStorageDirectory().getAbsolutePath() + path;
}
/**
* Starts a new recording.
*/
public void start() throws IOException {
String state = android.os.Environment.getExternalStorageState();
if(!state.equals(android.os.Environment.MEDIA_MOUNTED)) {
throw new IOException("SD Card is not mounted. It is " + state + ".");
}
// make sure the directory we plan to store the recording in exists
File directory = new File(path).getParentFile();
if (!directory.exists() && !directory.mkdirs()) {
throw new IOException("Path to file could not be created.");
}
recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile(path);
recorder.prepare();
recorder.start();
}
/**
* Stops a recording that has been previously started.
*/
public void stop() throws IOException {
recorder.stop();
recorder.release();
}
}
**ListAdapter ::**
package com.SaxParser2;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class ListViewAdapter extends BaseAdapter {
Activity context;
String title[];
String description[];
AudioRecorder recorder;// = new AudioRecorder("/audiometer/r");
private static String mFileName = null;
private MediaRecorder mRecorder = null;
private MediaPlayer mPlayer = null;
public ListViewAdapter(Activity context, String[] title,
String[] description) {
super();
this.context = context;
this.title = title;
this.description = description;
}
public int getCount() {
// TODO Auto-generated method stub
return title.length;
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
private class ViewHolder {
TextView txtViewTitle;
TextView txtViewDescription;
Button record, stop;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
final ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.listitem_row, null);
holder = new ViewHolder();
holder.txtViewTitle = (TextView) convertView
.findViewById(R.id.textView1);
holder.txtViewDescription = (TextView) convertView
.findViewById(R.id.textView2);
holder.record = (Button) convertView.findViewById(R.id.record);
holder.stop = (Button) convertView.findViewById(R.id.stop);
recorder = new AudioRecorder("/audiometer/r"+ position);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
try {
holder.txtViewTitle.setText(title[position]);
holder.txtViewDescription.setText(description[position]);
} catch (ArrayIndexOutOfBoundsException e) {
e.printStackTrace();
}
holder.record.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
recorder.start();
} catch (IOException e) {
Writer writer = new StringWriter();
PrintWriter printWriter = new PrintWriter(writer);
e.printStackTrace(printWriter);
String s = writer.toString();
Toast.makeText(context, s, Toast.LENGTH_LONG).show();
}
}
});
holder.stop.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
recorder.stop();
} catch (IOException e) {
Writer writer = new StringWriter();
PrintWriter printWriter = new PrintWriter(writer);
e.printStackTrace(printWriter);
String s = writer.toString();
Toast.makeText(context, s, Toast.LENGTH_LONG).show();
}
}
});
return convertView;
}
}
答案 0 :(得分：2)
查看此活动类，检查代码与尝试使用此 ListViewAdapter：
的不同之处public class ListViewAdapter extends BaseAdapter {
Activity context;
String title[];
String description[];
AudioRecorder recorder; // here I made changes......
private static String mFileName = null;
private MediaRecorder mRecorder = null;
private MediaPlayer mPlayer = null;
public ListViewAdapter(Activity context, String[] title,
String[] description) {
super();
this.context = context;
this.title = title;
this.description = description;
}
public int getCount() {
// TODO Auto-generated method stub
return title.length;
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
private class ViewHolder {
TextView txtViewTitle;
TextView txtViewDescription;
Button record, stop;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
final ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.listitem_row, null);
holder = new ViewHolder();
holder.txtViewTitle = (TextView) convertView
.findViewById(R.id.textView1);
holder.txtViewDescription = (TextView) convertView
.findViewById(R.id.textView2);
holder.record = (Button) convertView.findViewById(R.id.record);
holder.stop = (Button) convertView.findViewById(R.id.stop);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
try {
holder.txtViewTitle.setText(title[position]);
holder.txtViewDescription.setText(description[position]);
} catch (ArrayIndexOutOfBoundsException e) {
e.printStackTrace();
}
holder.record.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
recorder = new AudioRecorder("/audiometer/r"+ position); // here I made changes......
recorder.start();
} catch (IOException e) {
Writer writer = new StringWriter();
PrintWriter printWriter = new PrintWriter(writer);
e.printStackTrace(printWriter);
String s = writer.toString();
Toast.makeText(context, s, Toast.LENGTH_LONG).show();
}
}
});
holder.stop.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
recorder.stop();
} catch (IOException e) {
Writer writer = new StringWriter();
PrintWriter printWriter = new PrintWriter(writer);
e.printStackTrace(printWriter);
String s = writer.toString();
Toast.makeText(context, s, Toast.LENGTH_LONG).show();
}
}
});
return convertView;
}
}
您的AudioRecorder课程：
package com.SaxParser2;
import java.io.File;
import java.io.IOException;
import java.util.Calendar;
import java.util.Date;
import java.util.Random;
import android.media.MediaRecorder;
import android.os.Environment;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
public class AudioRecorder {
private MediaRecorder recorder; // here I made changes......
private String path;
private Random myRandom = new Random();
String currentDateTimeString = DateFormat.getDateInstance().format(new Date());
/**
* Creates a new audio recording at the given path (relative to root of SD card).
*/
public AudioRecorder(String path) {
this.path = sanitizePath(path);
}
public String sanitizePath(String path) {
if (!path.startsWith("/")) {
path = "/" + path;
}
if (!path.contains(".")) {
Calendar c = Calendar.getInstance();
System.out.println("Current time => "+c.getTime());
int strHour = c.get(Calendar.HOUR);
int strSecond = c.get(Calendar.SECOND);
int strMinute = c.get(Calendar.MINUTE);
int strMonth = c.get(Calendar.MONTH);
int strYear = c.get(Calendar.YEAR);
int strDay = c.get(Calendar.DAY_OF_MONTH);
path += String.valueOf(myRandom.nextInt())+""+strSecond+strMinute+strDay+strMonth+strYear+".mp3";
}
return Environment.getExternalStorageDirectory().getAbsolutePath() + path;
}
/**
* Starts a new recording.
*/
public void start() throws IOException {
String state = android.os.Environment.getExternalStorageState();
if(!state.equals(android.os.Environment.MEDIA_MOUNTED)) {
throw new IOException("SD Card is not mounted. It is " + state + ".");
}
// make sure the directory we plan to store the recording in exists
File directory = new File(path).getParentFile();
if (!directory.exists() && !directory.mkdirs()) {
throw new IOException("Path to file could not be created.");
}
recorder = new MediaRecorder(); // here I made changes......
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile(path);
recorder.prepare();
recorder.start();
}
/**
* Stops a recording that has been previously started.
*/
public void stop() throws IOException {
recorder.stop();
recorder.release();
}
}
答案 1 :(得分：1)
当您再次尝试录制时重新初始化媒体编码器，尝试更改此代码，
public void start() throws IOException {
String state = android.os.Environment.getExternalStorageState();
if(!state.equals(android.os.Environment.MEDIA_MOUNTED)) {
throw new IOException("SD Card is not mounted. It is " + state + ".");
}
// make sure the directory we plan to store the recording in exists
File directory = new File(path).getParentFile();
if (!directory.exists() && !directory.mkdirs()) {
throw new IOException("Path to file could not be created.");
}
recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile(path);
recorder.prepare();
recorder.start();
}
/**
* Stops a recording that has been previously started.
*/
public void stop() throws IOException {
recorder.stop();
recorder.release();
recorder=null;
}