根据上一节代码里,加入一个录音功能,上传到服务器,就能实现一个录制器
当手机处于通话状态时,开启录音机
获取MediaRecorder对象,通过new出来
调用MediaRecorder对象的setAudioSource()方法,设置音频源,
参数:MediaRecorder.AudioSource.MIC,参数是麦克风,默认只支持单向录音
调用MediaRecorder对象的setOutputFormat(),设置输出格式,
参数:MediaRecorder.OutputFormat.THREE_GPP
调用MediaRecorder对象的setAudoEncoder()方法,设置音频编码
参数:MediaRecorder.AudioEncoder.AMR_NB
调用MediaRecorder对象的setOutputFile(path)方法,设置文件保存路径
参数:”/sdcard/”+System.currentTimeMilis+”.3gp”
调用MediaRecorder对象的prepare()方法,准备
调用MediaRecorder对象的start()方法,开始
调用MediaRecorder对象的stop()方法,停止
调用MediaRecorder对象的reset()方法,重置
调用MediaRecorder对象的release()方法,释放对象
需要权限android.permission.RECORD_AUDIO
需要写文件android.permission.WRITE_EXTERNAL_STORGE
开启服务
获取Intent对象,new Intent(this,PhoneService.class),参数:上下文,字节码
调用startService(intent)方法,参数:Intent对象
关闭服务
获取Intent对象,new Intent(this,PhoneService.class),参数:上下文,字节码
调用stopService(intent)方法,参数:Intent对象
在应用管理器手工停止服务
服务放生命周期
onCreate() ==> onStartCommand() ==> onStart() ==> onDestory()
服务只会被执行一次,如果多次调用,会从onStartCommand()开始运行
MainActivity.java(主界面)
package com.tsh.listentel;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
// 开启服务
public void start(View v) {
Intent intent = new Intent(this, PhoneService.class);
startService(intent);
}
// 关闭服务
public void stop(View v) {
Intent intent = new Intent(this, PhoneService.class);
stopService(intent);
}
}
PhoneService.java(监听服务)
package com.tsh.listentel;
import java.io.IOException;
import android.app.Service;
import android.content.Intent;
import android.media.MediaRecorder;
import android.os.IBinder;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
public class PhoneService extends Service {
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
// 服务创建
@Override
public void onCreate() {
super.onCreate();
System.out.println("服务创建");
TelephonyManager tm = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
tm.listen(new MyPhoneStateListener(),
PhoneStateListener.LISTEN_CALL_STATE);
}
// 内部类
private class MyPhoneStateListener extends PhoneStateListener {
private MediaRecorder recorder;
@Override
public void onCallStateChanged(int state, String incomingNumber) {
super.onCallStateChanged(state, incomingNumber);
try {
switch (state) {
case TelephonyManager.CALL_STATE_IDLE:
System.out.println("空闲状态");
//关闭
if (recorder != null) {
recorder.stop();
recorder.reset();
recorder.release();
}
break;
case TelephonyManager.CALL_STATE_RINGING:
System.out.println("响铃状态");
//准备
recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile("/sdcard/"
+ System.currentTimeMillis() + ".3gp");
recorder.prepare();
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
System.out.println("通话状态");
//开录
if (recorder != null) {
recorder.start();
}
break;
default:
break;
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
// 服务销毁
@Override
public void onDestroy() {
System.out.println("服务销毁");
super.onDestroy();
}
}