java - AUDIOFOCUS_LOSS 在 android 中打完电话后调用

Question

我正在尝试在电话响起时暂停媒体播放器。我使用来自 android 站点的示例代码。是这样的；

public void onAudioFocusChange(int focusChange) {
        switch (focusChange) {
        case AudioManager.AUDIOFOCUS_GAIN:
            // resume playback
            if (mMediaPlayer != null && !mMediaPlayer.isPlaying()) {
                mMediaPlayer.start();
                mMediaPlayer.setVolume(1.0f, 1.0f);
            }

            break;

        case AudioManager.AUDIOFOCUS_LOSS:
            // Lost focus for an unbounded amount of time: stop playback and
            // release media player
            stopMediaPlayer();
            break;

        case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
            // Lost focus for a short time, but we have to stop
            // playback. We don't release the media player because playback
            // is likely to resume
            if (mMediaPlayer.isPlaying())
                mMediaPlayer.pause();
            break;

        case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
            // Lost focus for a short time, but it's ok to keep playing
            // at an attenuated level
            if (mMediaPlayer.isPlaying())
                mMediaPlayer.setVolume(0.1f, 0.1f);
            break;
        }
    }

当电话响起时发送AUDIOFOCUS_LOSS_TRANSIENT；没关系。当通话结束时，发送 AUDIOFOCUS_GAIN 并且播放器继续播放；这也可以。但是在发送 AUDIOFOCUS_GAIN 之后，AUDIOFOCUS_LOSS 就被发送了。知道为什么它会失去音频焦点吗？提前致谢。

Answer 1

要检查两件事:1)例如，您是否有一个播放按钮，单击该按钮后，请求焦点并开始播放？我有一次遇到问题，他们播放“滴答”声以提供点击反馈。发生这种情况时，他们会将音频焦点从我的应用程序中移开。在您的 XML 中，为该 Activity 中的所有按钮将此值设置为 false:

android:soundEffectsEnabled = 'false'

2) 检查是否安装了其他同样请求焦点的媒体播放器应用程序。他们是否在失去焦点后立即请求关注？如果是这样，除了警告您的用户不要安装此应用程序之外，您无能为力。