目录

• 一，先看效果图
• 二，实现方式

做音乐播放器，必然要用到通知栏，由于通知栏很多版本都有改动，一些厂商也做了调整，适配起来比较麻烦，能用系统自带的就用。

这里分享一下系统媒体通知栏的适配。

需要考虑的问题如下：

1，通知栏适配，音乐播放需要常驻，所以要维护一个通知栏。

2，音控处理，在安卓7.0及以下，通过MediaSessionCompat可控制锁屏页音乐播放。

3，对于耳机的处理，不管是线耳机还是蓝牙耳机，耳机控制播放暂停，下一曲上一曲等操作。

4，打电话处理，在听音乐的同时如果电话进来后挂断，希望可以自动播放。

5，音频播放焦点处理，如果有别的应用抢占焦点可进行暂停播放。还有就是进入APP时想拥有音频焦点，都可以通过AudioManager进行处理。

一，先看效果图

华为MatePad11 系统鸿蒙3.0

华为HONOR Pad 6 系统鸿蒙2.0

小米 NOTE PRO 系统7.0

华为Mate 8 系统8.0

魅族6T 系统7.0

锤子 系统11

OPPO 系统12

在系统7.0锁屏页效果

二，实现方式

创建通知管理类NotifyBuilderManager代码如下：

package com.idujing.myapplication.manager;
import android.annotation.SuppressLint;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import androidx.core.app.NotificationCompat;
import com.idujing.myapplication.R;
/**
 * 音频播放通知栏管理
 */
public class NotifyBuilderManager {
    private final String TAG = getClass().getSimpleName();
    public static final String ACTION_NEXT = "com.idujing.play.notify.next";// 下一首
    public static final String ACTION_PREV = "com.idujing.play.notify.prev";// 上一首
    public static final String ACTION_PLAY_PAUSE = "com.idujing.play.notify.play_state";// 播放暂停广播
    private static final int NOTIFICATION_ID = 0x123;
    private Service mContext;
    private Notification mNotification;
    private NotificationManager mNotificationManager;
    private NotificationCompat.Builder mNotificationBuilder;
    private MediaSessionManager mSessionManager;
    private PendingIntent mPendingPlay;
    private PendingIntent mPendingPre;
    private PendingIntent mPendingNext;
    private boolean isRunningForeground = false;
    public boolean isRunningForeground() {
        return isRunningForeground;
    }
    public NotifyBuilderManager(Service context) {
        this.mContext = context;
        mSessionManager = new MediaSessionManager(context, null);
    }
    /**
     * 初始化通知栏
     */
    private void initNotify() {
        mNotificationManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
        Class<?> clazz = null;
        try {
            clazz = Class.forName("具体的播放器类名");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        // 适配12.0及以上
        int flag;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
            flag = PendingIntent.FLAG_IMMUTABLE;
        } else {
            flag = PendingIntent.FLAG_UPDATE_CURRENT;
        }
        //绑定事件通过创建的具体广播去接收即可。
        Intent infoIntent = new Intent(mContext, clazz);
        PendingIntent pendingInfo = PendingIntent.getActivity(mContext, 0, infoIntent, flag);
        Intent preIntent = new Intent();
        preIntent.setAction(ACTION_PREV);
        mPendingPre = PendingIntent.getBroadcast(mContext, 1, preIntent, flag);
        Intent playIntent = new Intent();
        playIntent.setAction(ACTION_PLAY_PAUSE);
        mPendingPlay = PendingIntent.getBroadcast(mContext, 2, playIntent, flag);
        Intent nextIntent = new Intent();
        nextIntent.setAction(ACTION_NEXT);
        mPendingNext = PendingIntent.getBroadcast(mContext, 3, nextIntent, PendingIntent.FLAG_IMMUTABLE);
        androidx.media.app.NotificationCompat.MediaStyle style = new androidx.media.app.NotificationCompat.MediaStyle()
                .setShowActionsInCompactView(0, 1, 2)
                .setMediaSession(mSessionManager.getMediaSession());
        mNotificationBuilder = new NotificationCompat.Builder(mContext, initChannelId())
                .setSmallIcon(R.mipmap.ic_launcher)
                .setPriority(NotificationCompat.PRIORITY_MAX)
                .setContentIntent(pendingInfo)
                .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
                .setStyle(style);
        isRunningForeground = true;
    }
    /**
     * 创建Notification ChannelID
     *
     * @return 频道id
     */
    private String initChannelId() {
        // 通知渠道的id
        String id = "music_01";
        // 用户可以看到的通知渠道的名字.
        CharSequence name = mContext.getString(R.string.app_name);
        // 用户可以看到的通知渠道的描述
        String description = "通知栏播放控制";
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            int importance = NotificationManager.IMPORTANCE_LOW;
            NotificationChannel channel = new NotificationChannel(id, name, importance);
            channel.setDescription(description);
            channel.enableLights(false);
            channel.enableVibration(false);
            mNotificationManager.createNotificationChannel(channel);
        }
        return id;
    }
    /**
     * 取消通知
     */
    public void cancelNotification() {
        if (mNotificationManager != null) {
            mContext.stopForeground(true);
            mNotificationManager.cancel(NOTIFICATION_ID);
            isRunningForeground = false;
        }
    }
    /**
     * 设置通知栏大图片
     */
    private void updateCoverSmall() {
        Glide.with(mContext).asBitmap()
                .load(url)
                .into(new CustomTarget<Bitmap>() {
                    @Override
                    public void onResourceReady(@NonNull Bitmap resource, @Nullable Transition<? super Bitmap> transition) {
                        mNotificationBuilder.setLargeIcon(resource);
                        mNotification = mNotificationBuilder.build();
                        mNotificationManager.notify(NOTIFICATION_ID, mNotification);
                    }
                    @Override
                    public void onLoadCleared(@Nullable Drawable placeholder) {
                    }
                    @Override
                    public void onLoadFailed(@Nullable Drawable errorDrawable) {
                        super.onLoadFailed(errorDrawable);
                        Log.e(TAG, "onLoadFailed: ");
                    }
                });
    }
    /**
     * 更新状态栏通知
     */
    @SuppressLint("RestrictedApi")
    public void updateNotification(boolean isMusicPlaying) {
        if (mNotification == null) {
            initNotify();
        }
        mSessionManager.updateMetaData();
        if (mNotificationBuilder != null) {
            int playButtonResId = isMusicPlaying
                    ? android.R.drawable.ic_media_pause : android.R.drawable.ic_media_play;
            if (!mNotificationBuilder.mActions.isEmpty()) {
                mNotificationBuilder.mActions.clear();
            }
            mNotificationBuilder
                    .addAction(android.R.drawable.ic_media_previous, "Previous", mPendingPre) // #0
                    .addAction(playButtonResId, "Pause", mPendingPlay)  // #1
                    .addAction(android.R.drawable.ic_media_next, "Next", mPendingNext);
            mNotificationBuilder.setContentTitle("主标题");
            mNotificationBuilder.setContentText("副标题");
            updateCoverSmall();
            mNotification = mNotificationBuilder.build();
            mContext.startForeground(NOTIFICATION_ID, mNotification);
            mNotificationManager.notify(NOTIFICATION_ID, mNotification);
        }
    }
}

创建音控管理类MediaSessionManager代码如下：

package com.idujing.myapplication.manager;
import android.content.Context;
import android.os.Handler;
import android.support.v4.media.MediaMetadataCompat;
import android.support.v4.media.session.MediaSessionCompat;
import android.support.v4.media.session.PlaybackStateCompat;
/**
 * 主要管理Android 5.0以后线控和蓝牙远程控制播放
 */
public class MediaSessionManager {
    private static final String TAG = "MediaSessionManager";
    //指定可以接收的来自锁屏页面的按键信息
    private static final long MEDIA_SESSION_ACTIONS =
            PlaybackStateCompat.ACTION_PLAY
                    | PlaybackStateCompat.ACTION_PAUSE
                    | PlaybackStateCompat.ACTION_PLAY_PAUSE
                    | PlaybackStateCompat.ACTION_SKIP_TO_NEXT
                    | PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS
                    | PlaybackStateCompat.ACTION_STOP
                    | PlaybackStateCompat.ACTION_SEEK_TO;
    private final Context mContext;
    private MediaSessionCompat mMediaSession;
    private Handler mHandler;
    public MediaSessionManager(Context context, Handler handler) {
        this.mContext = context;
        this.mHandler = handler;
        setupMediaSession();
    }
    /**
     * 是否在播放
     *
     * @return
     */
    protected boolean isPlaying() {
        //具体去实现
        return false;
    }
    /**
     * 初始化并激活 MediaSession
     */
    private void setupMediaSession() {
        mMediaSession = new MediaSessionCompat(mContext, TAG);
        //指明支持的按键信息类型
        mMediaSession.setFlags(
                MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS |
                        MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS
        );
        mMediaSession.setCallback(callback, mHandler);
        mMediaSession.setActive(true);
    }
    /**
     * 更新正在播放的音乐信息，切换歌曲时调用
     */
    public void updateMetaData() {
        MediaMetadataCompat.Builder metaDta = new MediaMetadataCompat.Builder()
                .putString(MediaMetadataCompat.METADATA_KEY_TITLE, "title")
                .putString(MediaMetadataCompat.METADATA_KEY_ARTIST, "Artist")
                .putString(MediaMetadataCompat.METADATA_KEY_ALBUM, "Album")
                .putString(MediaMetadataCompat.METADATA_KEY_ALBUM_ARTIST, "Artist")
                .putLong(MediaMetadataCompat.METADATA_KEY_DURATION, 100);
        mMediaSession.setMetadata(metaDta.build());
        int state = isPlaying() ? PlaybackStateCompat.STATE_PLAYING :
                PlaybackStateCompat.STATE_PAUSED;
        mMediaSession.setPlaybackState(new PlaybackStateCompat.Builder()
                .setActions(MEDIA_SESSION_ACTIONS)
                .setState(state, 0, 1)
                .build());
   //锁屏页封面设置，高本版没有效果，因为通知栏权限调整。
        Glide.with(mContext).asBitmap().
                load(url)
                .into(new CustomTarget<Bitmap>() {
                    @Override
                    public void onResourceReady(@NonNull Bitmap resource, @Nullable Transition<? super Bitmap> transition) {
                        metaDta.putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, resource);
                        mMediaSession.setMetadata(metaDta.build());
                    }
                    @Override
                    public void onLoadCleared(@Nullable Drawable placeholder) {
                    }
                });
    }
    public MediaSessionCompat.Token getMediaSession() {
        return mMediaSession.getSessionToken();
    }
    /**
     * 释放MediaSession，退出播放器时调用
     */
    public void release() {
        mMediaSession.setCallback(null);
        mMediaSession.setActive(false);
        mMediaSession.release();
    }
    /**
     * API 21 以上 耳机多媒体按钮监听 MediaSessionCompat.Callback
     */
    private MediaSessionCompat.Callback callback = new MediaSessionCompat.Callback() {
        @Override
        public void onPlay() {
           //具体自己实现
        }
        @Override
        public void onPause() {
        }
        @Override
        public void onSkipToNext() {
        }
        @Override
        public void onSkipToPrevious() {
        }
        @Override
        public void onStop() {
        }
        @Override
        public void onSeekTo(long pos) {
        }
    };
}

创建音频焦点控制类AudioAndFocusManager

通过音频焦点控制，不管是别的应用抢占焦点，还是打电话都可以接收到状态。

package com.idujing.myapplication.manager;
import android.content.Context;
import android.media.AudioFocusRequest;
import android.media.AudioManager;
import android.os.Build;
import android.util.Log;
import androidx.annotation.RequiresApi;
/**
 * Description:    主要用来管理音频焦点
 */
public class AudioAndFocusManager {
    private static final String TAG = "AudioAndFocusManager";
    private AudioManager mAudioManager;
    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public AudioAndFocusManager(Context mContext) {
        mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
    }
    /**
     * 请求音频焦点
     */
    public void requestAudioFocus() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            AudioFocusRequest mAudioFocusRequest = new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN)
                    .setOnAudioFocusChangeListener(audioFocusChangeListener)
                    .build();
            int res = mAudioManager.requestAudioFocus(mAudioFocusRequest);
            if (res == 1) {
                Log.e(TAG, "res=" + true);
            }
        } else {
            if (audioFocusChangeListener != null) {
                boolean result = AudioManager.AUDIOFOCUS_REQUEST_GRANTED ==
                        mAudioManager.requestAudioFocus(audioFocusChangeListener,
                                AudioManager.STREAM_MUSIC,
                                AudioManager.AUDIOFOCUS_GAIN);
                Log.e(TAG, "requestAudioFocus result=" + result);
            }
        }
    }
    /**
     * 关闭音频焦点
     */
    public void abandonAudioFocus() {
        if (audioFocusChangeListener != null) {
            boolean result = AudioManager.AUDIOFOCUS_REQUEST_GRANTED ==
                    mAudioManager.abandonAudioFocus(audioFocusChangeListener);
            Log.e(TAG, "abandonAudioFocus result=" + result);
        }
    }
    /**
     * 音频焦点改变监听器
     */
    private AudioManager.OnAudioFocusChangeListener audioFocusChangeListener = focusChange -> {
        switch (focusChange) {
            case AudioManager.AUDIOFOCUS_LOSS://失去音频焦点
            case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT://暂时失去焦点
                break;
            case AudioManager.AUDIOFOCUS_GAIN://获取焦点
                break;
            default:
        }
    };
}