要实现监听到打电话和接电话的状态，需要用到广播接受者BroadcastReceiver，其实现代码请参考如下;

一、定义一个类，继承BroadcastReceiver，重写onReceive()方法。

1 package com.example.phonereceiver; 2  3 import android.app.Service; 4 import android.content.BroadcastReceiver; 5 import android.content.Context; 6 import android.content.Intent; 7 import android.telephony.TelephonyManager; 8  9 public class PhoneReceiver extends BroadcastReceiver {10 11     @Override12     public void onReceive(Context context, Intent intent) {13         if (intent.getAction().equals(Intent.ACTION_NEW_OUTGOING_CALL)) {
   //去电14             System.out.println("去电");15         } else {
   //来电(存在以下三种情况)16             TelephonyManager tm = (TelephonyManager) context.getSystemService(Service.TELEPHONY_SERVICE);17             switch (tm.getCallState()) {18             case TelephonyManager.CALL_STATE_IDLE:19                 System.out.println("挂断");20                 break;21             case TelephonyManager.CALL_STATE_OFFHOOK:22                 System.out.println("接听");23                 break;24             case TelephonyManager.CALL_STATE_RINGING:25                 System.out.println("响铃");26                 break;27             }28         }29     }30 }

二、在清单文件中注册该广播，并加上相应的权限。

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