I'm using an intent-filter to listen to changes in PHONE_STATE
<!-- Listen for phone status changes -->
<receiver android:name=".IncomingCallReciever">
开发者_如何学JAVA <intent-filter>
<action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>
</receiver>
... 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)
... but how can I determine if it is line 1 or line 2 that is ringing?
My application needs to react ONLY when the user is currently on a phone call and another call is coming in.
I found a way to implement this... posting it for "the next guy".
In a nutshell, the phone state moves between three states:
- 'IDLE' - You're not using the phone
- 'RINGING' - A call is coming in
- 'OFF_HOOK' - The phone is off the hook
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.
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;
}
}
}
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