android 电话状态的监听(来电和去电） PhoneStateListener和TelephonyManager

今天的程序可以实现电话状态改变时启动（来电、接听、挂断、拨打电话），但是暂时没法实现拨打电话时判断对方是否接听、转语音信箱等。Android在电话状态改变是会发送action为android.intent.action.PHONE_STATE的广播，而拨打电话时会发送action为android.intent.action.NEW_OUTGOING_CALL的广播，但是我看了下开发文档,暂时没发现有来电时的广播。知道这个就好办了，我们写个BroadcastReceiver用于接收这两个广播就可以了。

package com.pocketdigi.phonelistener;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;

public class PhoneReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        System.out.println("action"+intent.getAction());
        if(intent.getAction().equals(Intent.ACTION_NEW_OUTGOING_CALL)){
            //如果是去电（拨出）
            System.out.println("拨出");
        }else{
            //查了下android文档，貌似没有专门用于接收来电的action,所以，非去电即来电
            System.out.println("来电");
            TelephonyManager tm = (TelephonyManager)context.getSystemService(Service.TELEPHONY_SERVICE);   
            tm.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);
            //设置一个监听器
        }
    }
    PhoneStateListener listener=new PhoneStateListener(){

        @Override
        public void onCallStateChanged(int state, String incomingNumber) {
            // TODO Auto-generated method stub
            //state 当前状态 incomingNumber,貌似没有去电的API
            super.onCallStateChanged(state, incomingNumber);
            switch(state){
            case TelephonyManager.CALL_STATE_IDLE:
                System.out.println("挂断");
                break;
            case TelephonyManager.CALL_STATE_OFFHOOK:
                System.out.println("接听");
                break;
            case TelephonyManager.CALL_STATE_RINGING:
                System.out.println("响铃:来电号码"+incomingNumber);
                //输出来电号码
                break;
            }
        }
        
    };
}

要在AndroidManifest.xml注册广播接收器:

        <receiver android:name=".PhoneReceiver">
            <intent-filter>
                <action android:name="android.intent.action.PHONE_STATE"/>
        <action android:name="android.intent.action.NEW_OUTGOING_CALL" />
            </intent-filter>
        </receiver>

还要添加权限:

    <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
    <uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"></uses-permission>