Android 如何知道被叫人接听了电话（当他解除呼叫时，电话状态如何）

我试图知道如何在被叫人解除呼叫时发出警报。我使用了

PhoneStateListener

以及

BroadcastReceiver

通常它有三种状态

CALL\u STATE\u IDLE、CALL\u STATE\u OFFHOOK、CALL\u STATE\u RINGING

CALL\u STATE\u OFFHOOK

STATE在呼叫连接时正在呼叫，被呼叫方应答后没有调用上述三种状态的状态 打电话

这是我的收音机

public class PhoneStateBroadcastReceiver extends BroadcastReceiver
{

   @Override
    public void onReceive(Context context, Intent intent)
    {

        TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        telephonyManager.listen(new CustomPhoneStateListener(context), PhoneStateListener.LISTEN_CALL_STATE);

    }

    public class CustomPhoneStateListener  extends PhoneStateListener
    {

        Context context; //Context to make Toast if required 
        ActivityManager activityManager;

        public CustomPhoneStateListener(Context context)
        {
            super();
            this.context = context;
        }

        @Override
        public void onCallStateChanged(int state, String incomingNumber) 
        {
            super.onCallStateChanged(state, incomingNumber);
            Log.v("PhoneStateBroadcastReceiver", "onCallStateChanged state"+state);


            switch (state) 
            {
            case TelephonyManager.CALL_STATE_IDLE:
               Toast.makeText(context, "=CALL_STATE_IDLE==", Toast.LENGTH_LONG).show();
             break;
            case TelephonyManager.CALL_STATE_OFFHOOK:
                Toast.makeText(context, "CALL_STATE_OFFHOOK", Toast.LENGTH_LONG).show();

                break;
            case TelephonyManager.CALL_STATE_RINGING:
                Toast.makeText(context, "CALL_STATE_RINGING", Toast.LENGTH_LONG).show();

                break;
            default:
                break;
            }
        }
      }
 }

我已经看到一些应用程序在接受呼叫时录制语音。我想知道接听电话的情况

---

当被叫人接听电话时，是否还有其他状态或侦听器需要知道？

该状态将为挂机状态

设备调用状态：摘机。至少存在一个正在拨号、处于活动状态或处于保留状态的呼叫，并且没有呼叫正在响铃或等待。

您可以在此链接上看到：