Android之BroadcastReceiver广播接收者

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