需求:设置来电后自动录音。
首先设置一个按钮,代码很简单这里就不再给出。
建一个类,RecorderServicer extends Service
package com.ydl.recorder; import java.io.IOException; import android.app.Service;
import android.content.Intent;
import android.media.MediaRecorder;
import android.os.IBinder;
import android.telecom.TelecomManager;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager; public class RecorderServicer extends Service { private MediaRecorder recorder; @Override
public IBinder onBind(Intent intent) { return null;
} @Override
public void onCreate() {
super.onCreate();
TelephonyManager tm = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
//监听电话状态
tm.listen(new MyListener(), PhoneStateListener.LISTEN_CALL_STATE); } class MyListener extends PhoneStateListener {
@Override
public void onCallStateChanged(int state, String incomingNumber) {
// TODO Auto-generated method stub
super.onCallStateChanged(state, incomingNumber); switch (state) {
case TelephonyManager.CALL_STATE_IDLE:
System.out.println("空闲");
if (recorder != null) {
recorder.stop();// 停止录音
recorder.release();
recorder = null;
} break;
case TelephonyManager.CALL_STATE_RINGING:
System.out.println("响铃");
// 进行初始化
if (recorder != null) {
recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);// Microphone
// audio
// source
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);// 设置输出3gp格式
recorder.setOutputFile("sdcard/luyin.3gp");
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);// 设置音频编码格式
try {
recorder.prepare();// 做好准备
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} break;
case TelephonyManager.CALL_STATE_OFFHOOK:
System.out.println("摘机"); // 开始录音
if (recorder != null) {
recorder.start();
}
default:
break;
}
}
} }
在主活动界面设置按钮点击事件:用于启动上述服务
package com.ydl.recorder; import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View; public class MainActivity extends Activity { @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
} public void click(View v){
Intent intent = new Intent(this, RecorderServicer.class);
startService(intent); }
}
为了做的更逼真一些,设置开机启动服务:因此用到了上一章的开机广播机制
新建一个类:BootReceiver extends BroadcastReceiver 用于开机启动服务。因为服务是在后台的,不可见面,因此不必设置任务栈即不需要addFlags()方法
package com.ydl.recorder; import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent; public class BootReceiver extends BroadcastReceiver { //设置开机启动服务 @Override
public void onReceive(Context context, Intent intent) {
Intent it = new Intent(context, RecorderServicer.class);
context.startService(it); } }
上述代码都是对系统进行操作,例如:监听电话状态、设置开机广播、写出数据到SDcard、设置录音方式。因此需要配置权限,同时上边的而广播和服务都要进行相应的配置。
清单文件的权限和服务广播注册如下:
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/> <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<service android:name="com.ydl.recorder.RecorderServicer"></service>
<receiver android:name="com.ydl.recorder.BootReceiver">
<intent-filter >
<action android:name="android.intent.action.BOOT_COMPLETED"/>
</intent-filter>
</receiver>