音频录制 小实例

首先设置相关权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.moliying.a62_mediarecorder.MainActivity">

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="开始录制"
android:onClick="startClick"
android:id="@+id/button" android:layout_alignParentTop="true"
android:layout_alignParentStart="true" android:layout_alignParentEnd="true"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="停止录制"
android:onClick="stopClick"
android:id="@+id/button2" android:layout_below="@+id/button"
android:layout_alignParentStart="true" android:layout_alignParentEnd="true"/>
</RelativeLayout>

package com.moliying.a62_mediarecorder;

import android.media.MediaRecorder;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

private MediaRecorder mr;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mr = new MediaRecorder();
}

public void init(){
mr.reset();
mr.setAudioSource(MediaRecorder.AudioSource.MIC);//设置音源
mr.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);//设置输出的格式为mp3
mr.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
String path = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_MUSIC)+"/"+System.currentTimeMillis()+".mp3";
mr.setOutputFile(path);
try {
mr.prepare();
} catch (IOException e) {
e.printStackTrace();
}

}
public void startClick(View view){
init();
mr.start();
}

public void stopClick(View view){
mr.stop();
}

@Override
protected void onDestroy() {
super.onDestroy();
if(mr!=null)
mr.release();
}
}

第二个小实例  代码稍微有点差别 更严谨些

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.moliying.a60_media.RecorderActivity">

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="start"
android:id="@+id/button7_start"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="stop"
android:id="@+id/button8_stop"
android:layout_below="@+id/button7_start"
android:layout_alignParentStart="true" />
</RelativeLayout>

package com.moliying.a60_media;

import android.media.MediaRecorder;
import android.os.Environment;
import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import java.io.IOException;

public class RecorderActivity extends AppCompatActivity implements View.OnClickListener {

private MediaRecorder mr;
private Button button_start;
private Button button_stop;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recorder);
button_start = (Button) findViewById(R.id.button7_start);
button_stop = (Button) findViewById(R.id.button8_stop);
button_start.setOnClickListener(this);
button_stop.setOnClickListener(this);
button_stop.setEnabled(false);
mr = new MediaRecorder();
}

private void init(){
mr.reset();
mr.setAudioSource(MediaRecorder.AudioSource.MIC);//设置音源
mr.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);//文件格式
mr.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);//文件编码
String path = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_MUSIC)+"/"+ System.currentTimeMillis()+".mp3";
mr.setOutputFile(path);
try {
mr.prepare();
} catch (IOException e) {
e.printStackTrace();
}
}

@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.button7_start:
init();
mr.start();
button_stop.setEnabled(true);
button_start.setEnabled(false);
break;
case R.id.button8_stop:
mr.stop();
button_stop.setEnabled(false);
button_start.setEnabled(true);
break;
}
}

@Override
protected void onDestroy() {
super.onDestroy();
if(mr!=null)mr.release();
}
}