Android之BroadcastReceiver广播接收者

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如何利用广播知道谁给你打电话以及电话状态 —— >>

首先先有一个类继承 BroadcastReceiver ，重写 onReceive 方法

import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.telephony.TelephonyManager;import android.util.Log;/** * Created by Administrator on 2017/7/11 0011. */public class MyPhoneState extends BroadcastReceiver {    private TelephonyManager tm;    @Override    public void onReceive(Context context, Intent intent) {        if("android.intent.action.PHONE_STATE".equals(intent.getAction())){            //获取电话管理者            tm = (TelephonyManager) context.getSystemService(Context.TELECOM_SERVICE);            int state=tm.getCallState();            //获取电话号码            String number=intent.getStringExtra("incoming_number");            switch (state) {                case TelephonyManager.CALL_STATE_RINGING:                    Log.i("test","有电话进来了："+number);                    break;                case TelephonyManager.CALL_STATE_OFFHOOK:                    Log.i("test","正在通话中："+number);                    break;                case TelephonyManager.CALL_STATE_IDLE:                    Log.i("test","通话结束："+number);                    break;            }        }    }}

添加读取电话状态的权限

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