停止&来电时开始播放音乐 [英] Stopping & starting music on incoming calls

问题描述

我已经实现了一个 Activity，它可以从 Android 中的 URL 播放媒体.

I have implemented an activity that plays media from a URL in Android.

为了在来电时添加暂停功能，我创建了一个接收器，在来电时设置一个变量.活动在 onPause() 中读取这个变量，暂停音乐并重置它.当调用完成并恢复活动时，音乐在 onResume() 中恢复.

In order to add pause functionality when a call is incoming I created a receiver that sets a variable when the call is coming. The activity reads this variable in onPause(), pauses the music and resets it. When the call is done and the activity is resumed, the music is resumed in onResume().

只要活动具有焦点，这就可以正常工作.如果我在播放音乐时返回主屏幕，然后调用来了，则不会调用 onPause().因此，我不能停下来开始音乐.

This works fine as long the activity has the focus. If I go back to home screen while the music is playing, and then the call comes, onPause() is not called. Hence, I can't stop and start the music.

是否有人实现了一种媒体播放器，可以正确拦截来电/去电并停止/开始播放音乐?

Has anybody implemented a media player that intercepts incoming/outgoing calls and stops/starts music correctly?

推荐答案

您可以执行以下操作:

首先，您可以使用 PhoneStateListener 监听呼叫状态的变化.您可以在 TelephonyManager 中注册监听器:

First of all, you can listen for changes in the call state using a PhoneStateListener. You can register the listener in the TelephonyManager:

PhoneStateListener phoneStateListener = new PhoneStateListener() {
    @Override
    public void onCallStateChanged(int state, String incomingNumber) {
        if (state == TelephonyManager.CALL_STATE_RINGING) {
            //Incoming call: Pause music
        } else if(state == TelephonyManager.CALL_STATE_IDLE) {
            //Not in call: Play music
        } else if(state == TelephonyManager.CALL_STATE_OFFHOOK) {
            //A call is dialing, active or on hold
        }
        super.onCallStateChanged(state, incomingNumber);
    }
};
TelephonyManager mgr = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
if(mgr != null) {
    mgr.listen(phoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);
}

记住在不再需要时使用 PhoneStateListener.LISTEN_NONE 取消注册监听器:

Remember to unregister the listener when it's no longer needed using the PhoneStateListener.LISTEN_NONE:

TelephonyManager mgr = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
if(mgr != null) {
    mgr.listen(phoneStateListener, PhoneStateListener.LISTEN_NONE);
}

有关更多信息，请阅读文档.

您可以做的另一件事是监听广播android.intent.action.PHONE_STATE.它将包含额外的 TelephonyManager.EXTRA_STATE，它将为您提供有关呼叫的信息.在这里查看文档.

Another thing you can do is listening for the broadcast android.intent.action.PHONE_STATE. It will contain the extra TelephonyManager.EXTRA_STATE which will give you information about the call. Take a look at the documentation here.

请注意，在这两种情况下，您都需要 android.permission.READ_PHONE_STATE 权限.

Please note that you'll need the android.permission.READ_PHONE_STATE-permission in both cases.

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