Android实现边录边播功能

android可以通过mediarecorder和audiorecord这两个工具来实现录音，mediarecorder直接把麦克风的数据存到文件，并且能够直接进行编码(如amr,mp3等)，而audiorecord则是读取麦克风的音频流。本文使用audiorecord读取音频流，使用audiotrack播放音频流，通过“边读边播放”以及增大音量的方式来实现一个简单的助听器程序。

ps：由于目前的android模拟器还不支持audiorecord，因此本程序需要编译之后放到真机运行。

activity_layout:

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <button
        android:id="@+id/bt_yinpinhuilu_testing_exit"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="close"
        />
 
</linearlayout>

mainactivity: 

import androidx.appcompat.app.appcompatactivity;
import androidx.core.app.activitycompat;
import androidx.core.content.contextcompat;
 
import android.manifest;
import android.content.pm.packagemanager;
import android.media.audioformat;
import android.media.audiomanager;
import android.media.audiorecord;
import android.media.audiotrack;
import android.media.mediarecorder;
import android.os.bundle;
import android.util.log;
import android.view.view;
import android.widget.button;
import android.widget.textview;
import android.widget.toast;
 
import java.util.linkedlist;
 
public class mainactivity extends appcompatactivity implements view.onclicklistener {
 
    private static final string tag = "ktv";
    /**
     * 按钮
     */
    private button bt_exit;
    /**
     * audiorecord 写入缓冲区大小
     */
    protected int m_in_buf_size;
    /**
     * 录制音频对象
     */
    private audiorecord m_in_rec;
    /**
     * 录入的字节数组
     */
    private byte[] m_in_bytes;
    /**
     * 存放录入字节数组的大小
     */
    private linkedlist<byte[]> m_in_q;
    /**
     * audiotrack 播放缓冲大小
     */
    private int m_out_buf_size;
    /**
     * 播放音频对象
     */
    private audiotrack m_out_trk;
    /**
     * 播放的字节数组
     */
    private byte[] m_out_bytes;
    /**
     * 录制音频线程
     */
    private thread record;
    /**
     * 播放音频线程
     */
    private thread play;
    /**
     * 让线程停止的标志
     */
    private boolean flag = true;
 
    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.activity_main);
 
        this.settitle("音频回路");
 
        requestallpower();
        log.d("dfdfd", "333333333333");
 
        init();
        record = new thread(new recordsound());
        play = new thread(new playrecord());
        // 启动录制线程
        record.start();
        // 启动播放线程
        play.start();
    }
 
    private void init() {
        bt_exit = findviewbyid(r.id.bt_yinpinhuilu_testing_exit);
        log.i(tag, "bt_exit====" + bt_exit);
 
        bt_exit.setonclicklistener(this);
 
        // audiorecord 得到录制最小缓冲区的大小
        m_in_buf_size = audiorecord.getminbuffersize(8000,
                audioformat.channel_configuration_mono,
                audioformat.encoding_pcm_16bit);
        // 实例化播放音频对象
        m_in_rec = new audiorecord(mediarecorder.audiosource.mic, 8000,
                audioformat.channel_configuration_mono,
                audioformat.encoding_pcm_16bit, m_in_buf_size);
        // 实例化一个字节数组，长度为最小缓冲区的长度
        m_in_bytes = new byte[m_in_buf_size];
        // 实例化一个链表，用来存放字节组数
        m_in_q = new linkedlist<byte[]>();
 
        // audiotrack 得到播放最小缓冲区的大小
        m_out_buf_size = audiotrack.getminbuffersize(8000,
                audioformat.channel_configuration_mono,
                audioformat.encoding_pcm_16bit);
        // 实例化播放音频对象
        m_out_trk = new audiotrack(audiomanager.stream_music, 8000,
                audioformat.channel_configuration_mono,
                audioformat.encoding_pcm_16bit, m_out_buf_size,
                audiotrack.mode_stream);
        // 实例化一个长度为播放最小缓冲大小的字节数组
        m_out_bytes = new byte[m_out_buf_size];
    }
 
    public void onclick(view v) {
        // todo auto-generated method stub
        switch (v.getid()) {
 
            case r.id.bt_yinpinhuilu_testing_exit:
                flag = false;
                m_in_rec.stop();
                m_in_rec = null;
                m_out_trk.stop();
                m_out_trk = null;
                this.finish();
 
 
        }
    }

 
    /**
     * 录音线程
     */
    class recordsound implements runnable {
        @override
        public void run() {
            log.i(tag, "........recordsound run()......");
            byte[] bytes_pkg;
            // 开始录音
            m_in_rec.startrecording();
 
            while (flag) {
                m_in_rec.read(m_in_bytes, 0, m_in_buf_size);
                bytes_pkg = m_in_bytes.clone();
                log.i(tag, "........recordsound bytes_pkg==" + bytes_pkg.length);
                if (m_in_q.size() >= 2) {
                    m_in_q.removefirst();
                }
                m_in_q.add(bytes_pkg);
            }
        }
 
    }
 
    /**
     * 播放线程
     */
    class playrecord implements runnable {
        @override
        public void run() {
            // todo auto-generated method stub
            log.i(tag, "........playrecord run()......");
            byte[] bytes_pkg = null;
            // 开始播放
            m_out_trk.play();
 
            while (flag) {
                try {
                    m_out_bytes = m_in_q.getfirst();
                    bytes_pkg = m_out_bytes.clone();
                    m_out_trk.write(bytes_pkg, 0, bytes_pkg.length);
                } catch (exception e) {
                    e.printstacktrace();
                }
            }
        }
 
    }
 
 
    /**
     * 录音哦动态权限
     */
    public void requestallpower() {
        if (contextcompat.checkselfpermission(this, manifest.permission.record_audio) != packagemanager.permission_granted) {
            if (activitycompat.shouldshowrequestpermissionrationale(this,
                    manifest.permission.record_audio)) {
            } else {
                activitycompat.requestpermissions(this, new string[]{manifest.permission.record_audio,
                        manifest.permission.read_external_storage}, 1);
            }
        }
    }
 
 
    @override
    public void onrequestpermissionsresult(int requestcode, string[] permissions, int[] grantresults) {
        super.onrequestpermissionsresult(requestcode, permissions, grantresults);
 
        if (requestcode == 1) {
            for (int i = 0; i < permissions.length; i++) {
                toast.maketext(this, "" + "权限" + permissions[i] + "申请成功", toast.length_short).show();
            }
        }
    }
}

androidmanifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.test.speex">
 
    <uses-permission android:name="android.permission.write_external_storage" />
    <uses-permission android:name="android.permission.record_audio" />
 
 
    <application
        android:allowbackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundicon="@mipmap/ic_launcher_round"
        android:supportsrtl="true"
        android:theme="@style/apptheme">
        <activity android:name=".mainactivity">
            <intent-filter>
                <action android:name="android.intent.action.main" />
 
                <category android:name="android.intent.category.launcher" />
            </intent-filter>
        </activity>
    </application>
 
</manifest>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。