Java Android MediaRecorder/Player未录制或未播放
您好,我很难让简单的音频捕获工作(录制然后播放)。我从Android开发者的音频捕获页面获取了示例代码,我可以在手机上运行该代码,然后按开始/停止录制和开始/停止播放。没有抛出错误,因此我不确定从何处开始调试。我注意到的一件经验性的事情(也许是一个无用的事实)是,当我按下“播放”按钮时,麦克风会发出响亮的声音 我用来测试的设备是Galaxy Nexus,版本4.2.2 我会在Android开发者的网站上发布代码,这样它就可以很容易地被引用。我尝试了一些事情,但没有任何东西真正为我指明一个更接近于回答这个问题的方向。谢谢Java Android MediaRecorder/Player未录制或未播放,java,android,audio,Java,Android,Audio,您好,我很难让简单的音频捕获工作(录制然后播放)。我从Android开发者的音频捕获页面获取了示例代码,我可以在手机上运行该代码,然后按开始/停止录制和开始/停止播放。没有抛出错误,因此我不确定从何处开始调试。我注意到的一件经验性的事情(也许是一个无用的事实)是,当我按下“播放”按钮时,麦克风会发出响亮的声音 我用来测试的设备是Galaxy Nexus,版本4.2.2 我会在Android开发者的网站上发布代码,这样它就可以很容易地被引用。我尝试了一些事情,但没有任何东西真正为我指明一个更接近于
/*
* The application needs to have the permission to write to external storage
* if the output file is written to the external storage, and also the
* permission to record audio. These permissions must be set in the
* application's AndroidManifest.xml file, with something like:
*
* <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
* <uses-permission android:name="android.permission.RECORD_AUDIO" />
*
*/
package com.android.audiorecordtest;
import android.app.Activity;
import android.widget.LinearLayout;
import android.os.Bundle;
import android.os.Environment;
import android.view.ViewGroup;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
import android.content.Context;
import android.util.Log;
import android.media.MediaRecorder;
import android.media.MediaPlayer;
import java.io.IOException;
public class AudioRecordTest extends Activity
{
private static final String LOG_TAG = "AudioRecordTest";
private static String mFileName = null;
private RecordButton mRecordButton = null;
private MediaRecorder mRecorder = null;
private PlayButton mPlayButton = null;
private MediaPlayer mPlayer = null;
private void onRecord(boolean start) {
if (start) {
startRecording();
} else {
stopRecording();
}
}
private void onPlay(boolean start) {
if (start) {
startPlaying();
} else {
stopPlaying();
}
}
private void startPlaying() {
mPlayer = new MediaPlayer();
try {
mPlayer.setDataSource(mFileName);
mPlayer.prepare();
mPlayer.start();
} catch (IOException e) {
Log.e(LOG_TAG, "prepare() failed");
}
}
private void stopPlaying() {
mPlayer.release();
mPlayer = null;
}
private void startRecording() {
mRecorder = new MediaRecorder();
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mRecorder.setOutputFile(mFileName);
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
try {
mRecorder.prepare();
} catch (IOException e) {
Log.e(LOG_TAG, "prepare() failed");
}
mRecorder.start();
}
private void stopRecording() {
mRecorder.stop();
mRecorder.release();
mRecorder = null;
}
class RecordButton extends Button {
boolean mStartRecording = true;
OnClickListener clicker = new OnClickListener() {
public void onClick(View v) {
onRecord(mStartRecording);
if (mStartRecording) {
setText("Stop recording");
} else {
setText("Start recording");
}
mStartRecording = !mStartRecording;
}
};
public RecordButton(Context ctx) {
super(ctx);
setText("Start recording");
setOnClickListener(clicker);
}
}
class PlayButton extends Button {
boolean mStartPlaying = true;
OnClickListener clicker = new OnClickListener() {
public void onClick(View v) {
onPlay(mStartPlaying);
if (mStartPlaying) {
setText("Stop playing");
} else {
setText("Start playing");
}
mStartPlaying = !mStartPlaying;
}
};
public PlayButton(Context ctx) {
super(ctx);
setText("Start playing");
setOnClickListener(clicker);
}
}
public AudioRecordTest() {
mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
mFileName += "/audiorecordtest.3gp";
}
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
LinearLayout ll = new LinearLayout(this);
mRecordButton = new RecordButton(this);
ll.addView(mRecordButton,
new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT,
0));
mPlayButton = new PlayButton(this);
ll.addView(mPlayButton,
new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT,
0));
setContentView(ll);
}
@Override
public void onPause() {
super.onPause();
if (mRecorder != null) {
mRecorder.release();
mRecorder = null;
}
if (mPlayer != null) {
mPlayer.release();
mPlayer = null;
}
}
}
/*
*应用程序需要具有写入外部存储器的权限
*如果输出文件写入外部存储器,并且
*允许录制音频。必须在中设置这些权限
*应用程序的AndroidManifest.xml文件,包含以下内容:
*
*
*
*
*/
包com.android.audiorecordtest;
导入android.app.Activity;
导入android.widget.LinearLayout;
导入android.os.Bundle;
导入android.os.Environment;
导入android.view.ViewGroup;
导入android.widget.Button;
导入android.view.view;
导入android.view.view.OnClickListener;
导入android.content.Context;
导入android.util.Log;
导入android.media.MediaRecorder;
导入android.media.MediaPlayer;
导入java.io.IOException;
公共类录音测试扩展活动
{
私有静态最终字符串日志\u TAG=“AudioRecordTest”;
私有静态字符串mFileName=null;
私有记录按钮mRecordButton=null;
专用媒体记录器mRecorder=null;
私有播放按钮mPlayButton=null;
私有媒体播放器mPlayer=null;
私有void onRecord(布尔开始){
如果(启动){
startRecording();
}否则{
停止录制();
}
}
专用void onPlay(布尔启动){
如果(启动){
开始播放();
}否则{
停止铺设();
}
}
专用void startPlaying(){
mPlayer=新媒体播放器();
试一试{
mPlayer.setDataSource(mFileName);
mPlayer.prepare();
mPlayer.start();
}捕获(IOE异常){
Log.e(Log_标记,“prepare()失败”);
}
}
私人住宅{
mPlayer.release();
mPlayer=null;
}
私有无效开始记录(){
mRecorder=新的MediaRecorder();
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.ThreeGPP);
mRecorder.setOutputFile(mFileName);
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
试一试{
mRecorder.prepare();
}捕获(IOE异常){
Log.e(Log_标记,“prepare()失败”);
}
mRecorder.start();
}
私有void stopRecording(){
mRecorder.stop();
mRecorder.release();
mRecorder=null;
}
类RecordButton扩展按钮{
布尔值mStartRecording=true;
OnClickListener clicker=新的OnClickListener(){
公共void onClick(视图v){
onRecord(mStartRecording);
if(mStartRecording){
setText(“停止录制”);
}否则{
setText(“开始录制”);
}
mStartRecording=!mStartRecording;
}
};
公共记录按钮(上下文ctx){
超级(ctx);
setText(“开始录制”);
setOnClickListener(点击器);
}
}
类播放按钮扩展按钮{
布尔值mStartPlaying=true;
OnClickListener clicker=新的OnClickListener(){
公共void onClick(视图v){
onPlay(mStartPlaying);
如果(正在播放){
setText(“停止播放”);
}否则{
setText(“开始播放”);
}
mStartPlaying=!mStartPlaying;
}
};
公共播放按钮(上下文ctx){
超级(ctx);
setText(“开始播放”);
setOnClickListener(点击器);
}
}
公共录音测试(){
mFileName=Environment.getExternalStorageDirectory().getAbsolutePath();
mFileName+=“/audiorecordtest.3gp”;
}
@凌驾
创建公共空间(捆绑冰柱){
超级冰柱;
LinearLayout ll=新的LinearLayout(本);
mRecordButton=新记录按钮(此按钮);
ll.addView(mRecordButton,
新建LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_内容,
ViewGroup.LayoutParams.WRAP_内容,
0));
mPlayButton=新播放按钮(此按钮);
ll.addView(mPlayButton,
新建LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_内容,
ViewGroup.LayoutParams.WRAP_内容,
0));
setContentView(ll);
}
@凌驾
公共无效暂停(){
super.onPause();
if(mRecorder!=null){
mRecorder.release();
mRecorder=null;
}
if(mPlayer!=null){
mPlayer.release();
mPlayer=null;
}
}
}
您是否具有添加权限:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO"
将初始化mFileName变量的两行从构造函数移到onCreate():
致:
下载这个简单的项目,它可以完美地运行:
是的,我添加了权限。它很有效,非常感谢。另外,为什么活动构造函数无法正确初始化mFileName?但我想我会更注意使用OnCreate()而不是
public AudioRecordTest() {
mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
mFileName += "/audiorecordtest.3gp";
}
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
//initialise the path here
mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
mFileName += "/audiorecordtest.3gp";
//rest of the code