从其他Android应用程序请求录制焦点

<uses-permission android:name="android.permission.RECORD_AUDIO" />

AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
int result = audioManager.requestAudioFocus(null, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);
if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
    // 获取到录制焦点，可以开始录制音频
} else {
    // 无法获取录制焦点，需要处理无法录制音频的情况
}

AudioManager.OnAudioFocusChangeListener focusChangeListener = new AudioManager.OnAudioFocusChangeListener() {
    @Override
    public void onAudioFocusChange(int focusChange) {
        switch (focusChange) {
            case AudioManager.AUDIOFOCUS_LOSS:
                // 失去焦点，需要停止录制音频
                break;
            case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
                // 暂时失去焦点，可以暂停录制音频
                break;
            case AudioManager.AUDIOFOCUS_GAIN:
                // 重新获取焦点，可以继续录制音频
                break;
        }
    }
};