【发布时间】：2020-12-24 04:24:47
【问题描述】：
您好，我正在尝试在 android 中检测 呼叫等待状态 我成功检测到诸如 CALL_STATE_RINGING、CALL_STATE_IDLE 之类的 android 呼叫事件并且它工作正常，但我需要在有第二个来电时检测另一个活动呼叫，例如，第一个呼叫在电话上处于活动状态，当其他人试图拨打此号码时，让第一个号码为 ABC，第二个来电号码为 XYZ，因此当 ABC 呼叫连接时检查 ABC 是否已处于活动状态，然后断开第一个活动呼叫并选择第二个来电。
电话接收器
public abstract class PhonecallReceiver extends BroadcastReceiver {
//The receiver will be recreated whenever android feels like it. We need a static variable to remember data between instantiations
private static int lastState = TelephonyManager.CALL_STATE_IDLE;
private static Date callStartTime;
private static boolean isIncoming;
private static String savedNumber; //because the passed incoming is only valid in ringing
@Override
public void onReceive(Context context, Intent intent) {
//We listen to two intents. The new outgoing call only tells us of an outgoing call. We use it to get the number.
if (intent.getAction().equals("android.intent.action.NEW_OUTGOING_CALL")) {
savedNumber = intent.getExtras().getString("android.intent.extra.PHONE_NUMBER");
}
else{
String stateStr = intent.getExtras().getString(TelephonyManager.EXTRA_STATE);
String number = intent.getExtras().getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
Toast.makeText(context, number, Toast.LENGTH_SHORT).show();
int state = 0;
if(stateStr.equals(TelephonyManager.EXTRA_STATE_IDLE)){
state = TelephonyManager.CALL_STATE_IDLE;
Toast.makeText(context, "CALL_STATE_IDLE", Toast.LENGTH_SHORT).show();
}
else if(stateStr.equals(TelephonyManager.EXTRA_STATE_OFFHOOK)){
state = TelephonyManager.CALL_STATE_OFFHOOK;
Toast.makeText(context, "CALL_STATE_OFFHOOK", Toast.LENGTH_SHORT).show();
}
else if(stateStr.equals(TelephonyManager.EXTRA_STATE_RINGING)){
state = TelephonyManager.CALL_STATE_RINGING;
Toast.makeText(context, "CALL_STATE_RINGING", Toast.LENGTH_SHORT).show();
}
onCallStateChanged(context, state, number);
}
}
//Derived classes should override these to respond to specific events of interest
protected abstract void onIncomingCallReceived(Context ctx, String number, Date start);
protected abstract void onIncomingCallAnswered(Context ctx, String number, Date start);
protected abstract void onIncomingCallEnded(Context ctx, String number, Date start, Date end);
protected abstract void onOutgoingCallStarted(Context ctx, String number, Date start);
protected abstract void onOutgoingCallEnded(Context ctx, String number, Date start, Date end);
protected abstract void onMissedCall(Context ctx, String number, Date start);
//Deals with actual events
//Incoming call- goes from IDLE to RINGING when it rings, to OFFHOOK when it's answered, to IDLE when its hung up
//Outgoing call- goes from IDLE to OFFHOOK when it dials out, to IDLE when hung up
public void onCallStateChanged(Context context, int state, String number) {
if(lastState == state){
//No change, debounce extras
return;
}
switch (state) {
case TelephonyManager.CALL_STATE_RINGING:
isIncoming = true;
callStartTime = new Date();
savedNumber = number;
onIncomingCallReceived(context, number, callStartTime);
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
//Transition of ringing->offhook are pickups of incoming calls. Nothing done on them
if(lastState != TelephonyManager.CALL_STATE_RINGING){
isIncoming = false;
callStartTime = new Date();
onOutgoingCallStarted(context, savedNumber, callStartTime);
}
else
{
isIncoming = true;
callStartTime = new Date();
onIncomingCallAnswered(context, savedNumber, callStartTime);
}
break;
case TelephonyManager.CALL_STATE_IDLE:
//Went to idle- this is the end of a call. What type depends on previous state(s)
if(lastState == TelephonyManager.CALL_STATE_RINGING){
//Ring but no pickup- a miss
onMissedCall(context, savedNumber, callStartTime);
}
else if(isIncoming){
onIncomingCallEnded(context, savedNumber, callStartTime, new Date());
}
else{
onOutgoingCallEnded(context, savedNumber, callStartTime, new Date());
}
break;
}
lastState = state;
}
}
来电接收者
public class CallReceiver extends PhonecallReceiver {
@Override
protected void onIncomingCallReceived(Context ctx, String number, Date start)
{
Toast.makeText(ctx, "Call Recicevd", Toast.LENGTH_LONG).show();
}
@Override
protected void onIncomingCallAnswered(Context ctx, String number, Date start)
{
Toast.makeText(ctx, "Call CallAnswered", Toast.LENGTH_LONG).show();
}
@Override
protected void onIncomingCallEnded(Context ctx, String number, Date start, Date end)
{
Toast.makeText(ctx, "Call onIncomingCallEnded", Toast.LENGTH_LONG).show();
}
@Override
protected void onOutgoingCallStarted(Context ctx, String number, Date start)
{
Toast.makeText(ctx, "Call onOutgoingCallStarted", Toast.LENGTH_LONG).show();
}
@Override
protected void onOutgoingCallEnded(Context ctx, String number, Date start, Date end)
{
Toast.makeText(ctx, "Call onOutgoingCallEnded", Toast.LENGTH_LONG).show();
}
@Override
protected void onMissedCall(Context ctx, String number, Date start)
{
Toast.makeText(ctx, "Call onMissedCall", Toast.LENGTH_LONG).show();
}
}
【问题讨论】：