android四大组件之Service 电话录音

package com.example.luyin;


import android.app.Service;
import android.content.Intent;
import android.media.MediaRecorder;
import android.os.IBinder;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.widget.Toast;

public class MyService extends Service {
    private MediaRecorder recorder;

    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public void onCreate() {
        Toast.makeText(MyService.this, "服务启动", 1).show();
        // TODO Auto-generated method stub
        super.onCreate();
        // 获得电话管理器，用来监听电话的状态
        TelephonyManager manager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
        // event设置电话只监听电话状态改变
        manager.listen(new Listen(), PhoneStateListener.LISTEN_CALL_STATE);
    }

    private class Listen extends PhoneStateListener {
        // 电话状态一旦改变调用
        // 通过state的返回值来确定有没有来电话
        @Override
        public void onCallStateChanged(int state, String incomingNumber) {
            // TODO Auto-generated method stub
            super.onCallStateChanged(state, incomingNumber);
            switch (state) {
            // 空闲
            case TelephonyManager.CALL_STATE_IDLE:
                Toast.makeText(MyService.this, "空闲", 1).show();
                if(recorder!=null){
                    //录音结束并且释放资源
                    recorder.stop();
                    recorder.release();
                    recorder=null;
                }
                break;
            // 响铃
            case TelephonyManager.CALL_STATE_RINGING:
                Toast.makeText(MyService.this, "响铃", 1).show();
                if (recorder == null) {
                    // 录音机
                    recorder = new MediaRecorder();
                    // 设置录音的来源是麦克风
                    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
                    // 设置录音的保存格式
                    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
                    // 设置保存路径
                    recorder.setOutputFile("sdcard/voice.3gp");
                    // 设置编码
                    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
                    // 准备录音
                    try {
                        recorder.prepare();
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
                break;
            // 接听
            case TelephonyManager.CALL_STATE_OFFHOOK:
                Toast.makeText(MyService.this, "摘机", 1).show();
                if(recorder!=null){
                    //开始录音
                    recorder.start();
                }
                break;
            }
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.luyin"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.luyin.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service
            android:name="com.example.luyin.MyService" >
        </service>
    </application>

</manifest>