[移动开发]android 管理音频焦点

android 管理音频焦点

1.AudioFocusUtils 工具类

package com.example.goldreward.util;

import android.content.Context;
import android.media.AudioAttributes;
import android.media.AudioFocusRequest;
import android.media.AudioManager;
import android.os.Build;

/**
 * @author : Code23
 * @time : 2021/7/5
 * @module : AudioFocusUtils
 * @describe :音频焦点工具类
 */
public class AudioFocusUtils {
    //音频焦点管理
    private static AudioManager audioManager;

    /**
     * 初始化音频焦点
     *
     * @param context 上下文
     */
    public static void initAudioFocus(Context context) {
        if (audioManager == null) {
            //音频焦点
            audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
            //android8.0之后申请焦点方式
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                //AudioAttributes 配置(多媒体场景，申请的是音乐流)
                AudioAttributes audioAttributes = new AudioAttributes.Builder()
                        .setUsage(AudioAttributes.USAGE_MEDIA)
                        .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
                        .build();
                // 初始化AudioFocusRequest
                AudioFocusRequest audioFocusRequest = new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN)
                        .setAudioAttributes(audioAttributes)
                        //设置是否允许延迟获取焦点
                        .setAcceptsDelayedFocusGain(true)
                        //设置AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK会暂停，系统不会压低声音
                        .setWillPauseWhenDucked(true)
                        //设置焦点监听回调
                        .setOnAudioFocusChangeListener(onAudioFocusChangeListener)
                        .build();
                //申请焦点
                audioManager.requestAudioFocus(audioFocusRequest);
            } else {//android8.0之前申请焦点方式
                audioManager.requestAudioFocus(onAudioFocusChangeListener, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);
            }
        }
    }

    /**
     * 注销音频焦点
     */
    public static void abandonAudioFocus() {
        if (audioManager != null) {
            audioManager.abandonAudioFocus(onAudioFocusChangeListener);
            audioManager = null;
        }
    }

    /**
     * 音频焦点监听
     */
    private static AudioManager.OnAudioFocusChangeListener onAudioFocusChangeListener = new AudioManager.OnAudioFocusChangeListener() {
        @Override
        public void onAudioFocusChange(int focusChange) {
            switch (focusChange) {
                //失去音频焦点
                case AudioManager.AUDIOFOCUS_LOSS:
                case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
                case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
                    if (onAudioFocusListener != null) {
                        onAudioFocusListener.onLossAudioFocus();
                    }
                    break;
                //重新获取音频焦点
                case AudioManager.AUDIOFOCUS_GAIN:
                    if (onAudioFocusListener != null) {
                        onAudioFocusListener.onGainAudioFocus();
                    }
                    break;
            }
        }
    };

    private static OnAudioFocusListener onAudioFocusListener;

    public static void setOnAudioFocusListener(OnAudioFocusListener onAudioFocusListener) {
        AudioFocusUtils.onAudioFocusListener = onAudioFocusListener;
    }

    public interface OnAudioFocusListener {
        //失去焦点
        void onLossAudioFocus();

        //获取焦点
        void onGainAudioFocus();
    }
}

2.在activity使用AudioFocusUtils

package com.example.goldreward.activity;

import android.app.Activity;
import android.os.Bundle;

import androidx.annotation.Nullable;

import com.example.goldreward.util.AudioFocusUtils;

/**
 * @author : Code23
 * @time : 2021/7/5
 * @module : AudioFocusActivity
 * @describe :音频焦点Activity
 */
public class AudioFocusActivity extends Activity implements AudioFocusUtils.OnAudioFocusListener {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //申请音频焦点
        AudioFocusUtils.initAudioFocus(this);
    }

    /**
     * 失去焦点
     */
    @Override
    public void onLossAudioFocus() {
        //处理暂停音频播放
    }

    /**
     * 重新获取焦点
     */
    @Override
    public void onGainAudioFocus() {
        //处理重新播放音频
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //解绑音频焦点
        AudioFocusUtils.abandonAudioFocus();
    }
}

3.有兴趣可以去看看谷歌官方的管理音频焦点文档

谷歌官方文档：管理音频焦点