我怎样才能确定是否有呼叫振铃＆QUOT;线路2英寸（例如呼叫等待）

问题描述：

我使用一个意图过滤器来听变化PHONE_STATE

I'm using an intent-filter to listen to changes in PHONE_STATE

    <!-- Listen for phone status changes -->
    <receiver android:name=".IncomingCallReciever">
           <intent-filter>
               <action android:name="android.intent.action.PHONE_STATE" />
           </intent-filter>
    </receiver>

...并可以很容易地检测来电

... and can easily detect an incoming call

       intent != null 
    && intent.getAction().equals(TelephonyManager.ACTION_PHONE_STATE_CHANGED)
    && intent.hasExtra(TelephonyManager.EXTRA_STATE)
    && intent.getStringExtra(TelephonyManager.EXTRA_STATE).equals(TelephonyManager.EXTRA_STATE_RINGING)

...但我怎么能确定它是否是1号线或2号线正在振铃？

... but how can I determine if it is line 1 or line 2 that is ringing?

我的应用程序需要做出反应，只有当用户当前正在一个电话，另一个电话呼入

My application needs to react ONLY when the user is currently on a phone call and another call is coming in.

答

我找到了一种方法来实现这个......张贴了未来的家伙。

I found a way to implement this... posting it for "the next guy".

在简单地说，三个国家之间的手机状态招式：

In a nutshell, the phone state moves between three states:

在空闲 - 你不使用手机
在RINGING - 一个电话呼入
在OFF_HOOK - 这款手机被打爆

在化铃声状态广播，它是紧跟一个空闲或OFF_HOOK的状态恢复到什么是pre-呼入呼叫。

When a 'RINGING' state is broadcast, it is immediately followed by an IDLE or OFF_HOOK to restore the state to what it was pre-incoming-call.

把它放在一起，你结束了这一点：

Put it all together and you end up with this:

package com.telephony;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.telephony.TelephonyManager;

public class PhoneStateChangedReciever extends BroadcastReceiver {

    private static String lastKnownPhoneState = null;

    @Override
    public void onReceive(Context context, Intent intent) {
        if(intent != null && intent.getAction().equals(TelephonyManager.ACTION_PHONE_STATE_CHANGED)) {

            //State has changed
            String newPhoneState = intent.hasExtra(TelephonyManager.EXTRA_STATE) ? intent.getStringExtra(TelephonyManager.EXTRA_STATE) : null;

            //See if the new state is 'ringing'
            if(newPhoneState != null && newPhoneState.equals(TelephonyManager.EXTRA_STATE_RINGING)) {

                //If the last known state was 'OFF_HOOK', the phone was in use and 'Line 2' is ringing
                if(lastKnownPhoneState != null && lastKnownPhoneState.equals(TelephonyManager.EXTRA_STATE_OFFHOOK)) {
                    ...
                }

                //If it was anything else, the phone is free and 'Line 1' is ringing 
                else {
                    ... 
                }
            }
            lastKnownPhoneState = newPhoneState;
        }
    }
}

我怎样才能确定是否有呼叫振铃＆QUOT;线路2英寸（例如呼叫等待）

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