Android开发本地及网络Mp3音乐播放器(十六)歌词显示及滚动事件实现、ViewPager使用

实现功能：

歌词显示及滚动事件实现

ViewPager使用

后续将博文，将实现已下载音乐扫描功能和已存在歌曲歌词下载。

因为，没有自己的服务器，所以网络音乐所有相关功能(包含搜索音乐、下载音乐、下载歌词)均无法保证时效性，建议，尽快下载和练习；如果你下载时候，已经因为我采集的服务器更改规则，请给我留言，如果可以解决，我将在有空的时候献上新的源码。

截止到目前的源码下载：

http://download.csdn.net/album/detail/3105

(最新的，请下载最后一个，本博文对应版本2.1；如果需要逐步实现的过程，请下载所有)

欢迎移动开发爱好者交流：我的微信是iwanghang

另外，我打算开始找工作，如果沈阳或周边城市公司有意，也请与我联系。

实现效果如图：

实现代码如下：

PlayActivity如下：

package com.iwanghang.drmplayer;

import android.graphics.Bitmap;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
import android.widget.Toast;

import com.douzi.android.view.DefaultLrcBuilder;
import com.douzi.android.view.ILrcBuilder;
import com.douzi.android.view.ILrcView;
import com.douzi.android.view.LrcRow;
import com.douzi.android.view.LrcView;
import com.iwanghang.drmplayer.adapter.ViewPagerAdapter;
import com.iwanghang.drmplayer.utils.Constant;
import com.iwanghang.drmplayer.utils.ImageUtils;
import com.iwanghang.drmplayer.utils.MediaUtils;
import com.iwanghang.drmplayer.vo.Mp3Info;
import com.lidroid.xutils.db.sqlite.Selector;
import com.lidroid.xutils.exception.DbException;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.List;

import static com.iwanghang.drmplayer.PlayService.ORDER_PLAY;
import static com.iwanghang.drmplayer.PlayService.RANDOM_PLAY;
import static com.iwanghang.drmplayer.PlayService.SINGLE_PLAY;

/**
 * PlayActivity 点击MyMusicListFragment(本地音乐)底部UI中的专辑封面图片打开的Activity
 */
public class PlayActivity extends BaseActivity implements OnClickListener, OnSeekBarChangeListener ,OnPageChangeListener {
    private TextView textView2_title;//歌名
    private ImageView imageView1_ablum;//专辑封面图片
    private SeekBar seekBar1;//进度条
    private TextView textView1_start_time, textView1_end_time;//开始时间,结束时间
    private ImageView imageView1_play_mode;//菜单
    private ImageView imageView3_previous, imageView2_play_pause, imageView1_next;//上一首,播放暂停,下一首
    private ImageView imageView1_ablum_reflection;//专辑封面图片倒影
    private ImageView imageView1_favorite;//收藏按钮

    //private ArrayList<Mp3Info> mp3Infos;
    //private int position;//当前播放的位置
    private boolean isPause = false;//当前播放的是否为暂停状态
    private static final int UPDATE_TIME = 0x10;//更新播放事件的标记

    private DRMPlayerApp app;//取出全局对象 方便调用

    //歌词
    private ViewPager viewPager;
    private LrcView lrcView;// 自定义歌词视图
    private ArrayList<View> views = new ArrayList<>();
    private static final int UPDATE_LRC = 0x20;//更新播放事件的标记
    ILrcView mLrcView;
    public final static String TAG = "PlayActivity";
    private MediaPlayer mPlayer;
    private ViewPagerAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_music_play);
        //取出全局对象 方便调用
        app = (DRMPlayerApp) getApplication();
        //初始化界面信息
        //textView2_title = (TextView) findViewById(R.id.textView2_title);//歌名
        //imageView1_ablum = (ImageView) findViewById(R.id.imageView1_ablum);//专辑封面图片
        seekBar1 = (SeekBar) findViewById(R.id.seekBar1);//进度条
        textView1_start_time = (TextView) findViewById(R.id.textView1_start_time);//开始时间
        textView1_end_time = (TextView) findViewById(R.id.textView1_end_time);//结束时间
        imageView1_play_mode = (ImageView) findViewById(R.id.imageView1_play_mode);//菜单
        imageView3_previous = (ImageView) findViewById(R.id.imageView3_previous);//上一首
        imageView2_play_pause = (ImageView) findViewById(R.id.imageView2_play_pause);//播放暂停
        imageView1_next = (ImageView) findViewById(R.id.imageView1_next);//下一首
        imageView1_favorite = (ImageView) findViewById(R.id.imageView1_favorite);//收藏按钮
        lrcView = (LrcView) findViewById(R.id.lrcView);//自定义歌词视图

        //注册按钮点击监听事件
        imageView1_play_mode.setOnClickListener(this);
        imageView2_play_pause.setOnClickListener(this);
        imageView3_previous.setOnClickListener(this);
        imageView1_next.setOnClickListener(this);
        seekBar1.setOnSeekBarChangeListener(this);
        imageView1_favorite.setOnClickListener(this);

        //mp3Infos = MediaUtils.getMp3Infos(this);
        //bindPlayService();//绑定服务,异步过程,绑定后需要取得相应的值,来更新界面
        myHandler = new MyHandler(this);

        //独立音乐播放界面 和 歌词界面
        //viewPager = (ViewPager) findViewById(R.id.fgv_player_main);
        viewPager = (ViewPager) findViewById(R.id.viewpager);
        initViewPager();//初始化

        //以下直接调用change()是不行的,因为异步问题,会发生NullPointerException空指针异常
        //从MyMusicListFragment的专辑封面图片点击时间传过来的position(当前播放的位置)
        //position = getIntent().getIntExtra("position",0);
        //change(position);

        //通过在BaseActivity中绑定Service,添加如下代码实现change()
        //musicUpdatrListener.onChange(playService.getCurrentProgeress());

        //从MyMusicListFragment的专辑封面图片点击时间传过来的isPause(当前播放的是否为暂停状态)
        //isPause = getIntent().getBooleanExtra("isPause",false);

        //        mLrcView = new LrcView(this, null);
        //        setContentView((View) mLrcView);
        //
        //        //在目标位置读取lrc文件
        //        File LrcDirFile = new File(Environment.getExternalStorageDirectory() + Constant.DIR_LRC);
        //        System.out.println("LrcDirFile : " + LrcDirFile);
        //        if (!LrcDirFile.exists()) {
        //            LrcDirFile.mkdirs();
        //        }
        //        //把lrc转成字符串
        //        String lrc = LrcDirFile + "/" + "山丘" + ".lrc";
        //        //Log.d的输出颜色是蓝色的，仅输出debug调试的意思，但他会输出上层的信息，过滤起来可以通过DDMS的Logcat标签来选择.
        //        Log.d(TAG, "lrc:" + lrc);
        //
        //        //把lrc的字符串 转成数组
        //        ILrcBuilder builder = new DefaultLrcBuilder();
        //        List<LrcRow> rows = builder.getLrcRows(lrc);
        //
        //        //把lrc数组 设置到mLrcView里
        //        mLrcView.setLrc(rows);
        //        //beginLrcPlay();
        //
        //        //设置监听器,监听歌词滚动
        //        mLrcView.setListener(new ILrcView.LrcViewListener() {
        //            public void onLrcSeeked(int newPosition, LrcRow row) {
        //                if (mPlayer != null) {
        //                    Log.d(TAG, "onLrcSeeked:" + row.time);
        //                    mPlayer.seekTo((int)row.time);//用户滑动歌词界面,调整进度
        //                }
        //            }
        //        });
    }

    private void initViewPager() {//专辑封面图片Pager与歌词Pager
        //View album_image_layout = getLayoutInflater().inflate(R.layout.album_image_layout, null);
        //System.out.println("PlayActivity.initViewPager.album_image_layout:" + album_image_layout);

        View album_image_layout = LayoutInflater.from(getApplicationContext()).inflate(R.layout.album_image_layout, null);
        System.out.println("PlayActivity.initViewPager.album_image_layout:" + album_image_layout);
        //初始化界面信息

        //textView2_title = (TextView) findViewById(R.id.textView2_title);//歌名
        //这里要注意下,直接findViewById,返回的是textView2_title是null;像下面这样,加上layout才可以,否则在change的时候会报空指针异常
        textView2_title = (TextView) album_image_layout.findViewById(R.id.textView2_title);//歌名
        //System.out.println("PlayActivity.initViewPager.textView2_title:" + textView2_title);
        //System.out.println("PlayActivity.initViewPager.textView2_title.getText:" + textView2_title.getText());

        imageView1_ablum = (ImageView) album_image_layout.findViewById(R.id.imageView1_ablum);//专辑封面图片

        imageView1_ablum_reflection = (ImageView) album_image_layout.findViewById(R.id.imageView1_ablum_reflection);//专辑封面图片倒影

        views.add(album_image_layout);//添加专辑封面图片Pager

        //View lrc_layout = getLayoutInflater().inflate(R.layout.lrc_layout, null);

        View lrc_layout = LayoutInflater.from(getApplicationContext()).inflate(R.layout.lrc_layout, null);
        System.out.println("PlayActivity.initViewPager.lrc_layout:" + lrc_layout);

        lrcView = (LrcView) lrc_layout.findViewById(R.id.lrcView);
        //设置滚动事件
        lrcView.setListener(new ILrcView.LrcViewListener() {
            @Override
            public void onLrcSeeked(int newPosition, LrcRow row) {
                if (playService.isPlaying()) {
                    playService.seekTo((int) row.time);
                }
            }
        });
        lrcView.setLoadingTipText("正在加载歌词......");
        lrcView.setBackgroundResource(R.mipmap.app_splash_bg);
        lrcView.getBackground().setAlpha(150);//背景透明度0-255
        views.add(lrc_layout);
        System.out.println("PlayActivity.initViewPager.views:" + views);

        //adapter = new ViewPagerAdapter(views);
        adapter = new ViewPagerAdapter(views);
        viewPager.setAdapter(adapter);

        //viewPager.setAdapter(new ViewPagerAdapter(views));
        System.out.println("PlayActivity.initViewPager.viewPager:" + viewPager);
        viewPager.addOnPageChangeListener(this);
        System.out.println("PlayActivity.initViewPager.viewPager:" + viewPager);
    }

    //把播放服务的绑定和解绑放在onResume,onPause里,好处是,每次回到当前Activity就获取一次播放状态
    @Override
    protected void onResume() {
        super.onResume();
        bindPlayService();//绑定服务
    }

    @Override
    protected void onPause() {
        super.onPause();
        unbindPlayService();//解绑服务
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unbindPlayService();//解绑服务
    }

    //Handler用于更新已经播放时间
    private static MyHandler myHandler;

    //进度条改变 (fromUser 是否来自用户的改变 , 而不是程序自身控制的改变)
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        if (fromUser) {
            //playService.pause();//暂停
            playService.seekTo(progress);//寻找指定的时间位置 (跳到某个时间点进行播放)
            //playService.start();//播放
        }
    }

    //进度条开始触摸
    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {

    }

    //进度条停止触摸
    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {

    }

    //页面滚动
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

    }

    //页面选择
    @Override
    public void onPageSelected(int position) {

    }

    //页面滚动状态改变
    @Override
    public void onPageScrollStateChanged(int state) {

    }

    static class MyHandler extends Handler {
        private PlayActivity playActivity;
        private WeakReference<PlayActivity> weak;//弱引用

        public MyHandler(PlayActivity playActivity) {
            //this.playActivity = playActivity;
            weak = new WeakReference<PlayActivity>(playActivity);
        }

        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            //System.out.println("PlayActivity.MyHandler.weak = " + weak);
            playActivity = weak.get();
            //System.out.println("PlayActivity.MyHandler.playActivity = " + playActivity);
            if (playActivity != null) {
                switch (msg.what) {
                    case UPDATE_TIME://更新时间(已经播放时间)
                        playActivity.textView1_start_time.setText(MediaUtils.formatTime((int) msg.obj));
                        break;
                    case UPDATE_LRC:
                        playActivity.lrcView.seekLrcToTime((int) msg.obj);
                        break;
                    default:
                        break;
                }
            }
        }
    }

    @Override
    public void publish(int progress) {
        //以下是是直接调用线程,但是不能这样做,会报错,线程异常
        //textView1_start_time.setText(MediaUtils.formatTime(progress));
        //所以,我们需要使用Handler
        //Message msg = myHandler.obtainMessage(UPDATE_TIME);//用于更新已经播放时间
        //msg.arg1 = progress;//用于更新已经播放时间
        //myHandler.sendMessage(msg);//用于更新已经播放时间

        //seekBar1.setProgress(progress);

        myHandler.obtainMessage(UPDATE_TIME, progress).sendToTarget();
        seekBar1.setProgress(progress);
        myHandler.obtainMessage(UPDATE_LRC, progress).sendToTarget();
        //System.out.println("PlayActivity.publish.myHandler = " + myHandler);
        //System.out.println("PlayActivity.publish.UPDATE_LRC = " + UPDATE_LRC);
        //System.out.println("PlayActivity.publish.progress = " + progress);
    }

    @Override
    public void change(int position) {//初始化,独立播放界面的歌曲切换后的初始化界面上的歌曲信息
        //if (this.playService.isPlaying()) {//获取是否为播放状态
        //System.out.println("PlayActivity.change.position = " + position);
        Mp3Info mp3Info = playService.mp3Infos.get(position);
        //System.out.println("PlayActivity.change.getTitle = " + mp3Info.getTitle());
        textView2_title.setText(mp3Info.getTitle());//设置歌名
        //textView2_title.setTtileText(mp3Info.getTitle());//设置歌名
        //System.out.println("PlayActivity.change.textView2_title = " + textView2_title);
        //System.out.println("PlayActivity.change.getText : " + textView2_title.getText());
        //System.out.println("PlayActivity.change.getText : " + textView2_title.getTtileText());

        //下面这句话是提交更新UI的,但是这个功能在adapter里面实现了,但是实现的方式,只适合UI需要更新的内容很少的时候
        //而且,就算使用,也是设置了专辑图片和倒影,以后使用,不是这里.
        //之所以放在这里,是因为我开始调试的时候,无法setText,最后通过Debug找到了问题所在
        //以后我会专门开个博文,介绍一下Debug
        //adapter.notifyDataSetChanged();

        //setText后,歌名没有显示,但是可以getText,尝试隐藏/显示,来刷新UI,结果歌名还是没有显示
        //viewPager.setVisibility(View.GONE);
        //getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.activity_music_play);
        //viewPager.setVisibility(View.VISIBLE);

        //setText后,歌名没有显示,但是可以getText,尝试隐藏/显示,来刷新UI,结果歌名还是没有显示
        //viewPager.setVisibility(View.GONE);
        //viewPager.setVisibility(View.VISIBLE);

        //获取专辑封面图片
        Bitmap albumBitmap = MediaUtils.getArtwork(this, mp3Info.getId(), mp3Info.getAlbumId(), true, false);
        //改变播放界面专辑封面图片
        imageView1_ablum.setImageBitmap(albumBitmap);
        textView1_end_time.setText(MediaUtils.formatTime(mp3Info.getDuration()));//设置结束时间
        imageView2_play_pause.setImageResource(R.mipmap.app_music_pause);//设置暂停图片
        seekBar1.setProgress(0);//设置当前进度为0
        seekBar1.setMax((int) mp3Info.getDuration());//设置进度条最大值为MP3总时间
        if (playService.isPlaying()) {
            imageView2_play_pause.setImageResource(R.mipmap.app_music_pause);
        } else {
            imageView2_play_pause.setImageResource(R.mipmap.app_music_play);
        }

        if (imageView1_ablum != null) {
            imageView1_ablum_reflection.setImageBitmap(ImageUtils.createReflectionBitmapForSingle(albumBitmap));//显示倒影
        }
        switch (playService.getPlay_mode()) {
            case ORDER_PLAY://顺序播放
                imageView1_play_mode.setImageResource(R.mipmap.app_mode_order);
                //imageView2_play_pause.setTag(ORDER_PLAY);
                break;
            case PlayService.RANDOM_PLAY://随机播放
                imageView1_play_mode.setImageResource(R.mipmap.app_mode_random);
                //imageView2_play_pause.setTag(RANDOM_PLAY);
                break;
            case PlayService.SINGLE_PLAY://单曲循环
                imageView1_play_mode.setImageResource(R.mipmap.app_mode_single);
                //imageView2_play_pause.setTag(SINGLE_PLAY);
                break;
            default:
                break;
        }

        long id = getId(mp3Info);

        //初始化收藏状态
        try {
            Mp3Info loveMp3Info = app.dbUtils.findFirst(Selector.from(Mp3Info.class).where("mp3InfoId", "=", mp3Info.getMp3InfoId()));//查出歌曲,SQL语句
            System.out.println("初始化收藏状态" + loveMp3Info);
//            if (loveMp3Info != null) {
//                imageView1_favorite.setImageResource(R.mipmap.app_love_selected);
//            } else {
//                imageView1_favorite.setImageResource(R.mipmap.app_love_unselected);
//            }
            if (loveMp3Info != null) {
                System.out.println("loveMp3Info.getIsLove() = " + loveMp3Info.getIsLove());
                if (loveMp3Info.getIsLove() == 0) {//返回值不为null,且,isLove为0时,也显示为'未收藏'
                    imageView1_favorite.setImageResource(R.mipmap.app_love_unselected);
                }else {//返回值为null,且,isLove为1时,一定显示为'已收藏'
                    imageView1_favorite.setImageResource(R.mipmap.app_love_selected);
                }
            } else {//返回值为null,一定显示为'未收藏'
                imageView1_favorite.setImageResource(R.mipmap.app_love_unselected);
            }
        } catch (DbException e) {
            e.printStackTrace();
        }

        //歌词
        String songName = mp3Info.getTitle();
        //歌词功能还不完善,后面会博文,会继续完善,暂时使用我已经下载好的lrc测试效果.
        songName = "山丘";//测试用的lrc的歌名
        String lrcPath = Environment.getExternalStorageDirectory() + Constant.DIR_LRC + "/" + songName + ".lrc";
        File lrcFile = new File(lrcPath);
        if (!lrcFile.exists()){
            //下载
            System.out.println("请下载歌词");
        }else{
            loadLRC(lrcFile);
        }
    }

    //如果是本地音乐,id就是id;如果是收藏音乐,id则是mp3InfoId
    //提供给 收藏按钮 点击事件时 调用.
    private long getId(Mp3Info mp3Info){
        //初始收藏状态
        long id = 0;
        switch (playService.getChangePlayList()){
            case PlayService.MY_MUSIC_LIST:
                System.out.println("当前为本地列表");
                id = mp3Info.getId();
                System.out.println("id =" + id);
                break;
            case PlayService.LOVE_MUSIC_LIST:
                System.out.println("当前为收藏列表");
                id = mp3Info.getMp3InfoId();
                System.out.println("id =" + id);
                break;
            default:
                break;
        }
        return id;
    }

    //点击事件
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.imageView2_play_pause: {//播放暂停按钮
                if (playService.isPlaying()) {//如果是播放状态
                    imageView2_play_pause.setImageResource(R.mipmap.app_music_play);//设置播放图片
                    playService.pause();
                } else {
                    if (playService.isPause()) {
                        imageView2_play_pause.setImageResource(R.mipmap.app_music_pause);//设置暂停图片
                        playService.start();//播放事件
                    } else {
                        //只有打开APP没有点击任何歌曲,同时,直接点击暂停播放按钮时.才会调用
                        //playService.play(0);

                        //只有打开APP没有点击任何歌曲,同时,直接点击暂停播放按钮时.才会调用
                        //默认播放的是,在PlayService的onCreate中 恢复状态值
                        playService.play(playService.getCurrentPosition());
                    }
                }
                break;
            }
            case R.id.imageView1_next: {//下一首按钮
                playService.next();//下一首
                break;
            }
            case R.id.imageView3_previous: {//上一首按钮
                playService.prev();//上一首
                break;
            }
            case R.id.imageView1_play_mode: {//循环模式按钮
                //int mode = (int) imageView1_play_mode.getTag();
                /**
                 * 以下Tosat内容,在strings.xml里,添加对应代码
                 *<string name="order_play">顺序播放</string>
                 *<string name="random_play">随机播放</string>
                 *<string name="single_play">单曲循环</string>
                 */
                switch (playService.getPlay_mode()) {
                    case ORDER_PLAY:
                        imageView1_play_mode.setImageResource(R.mipmap.app_mode_random);
                        //imageView1_play_mode.setTag(RANDOM_PLAY);
                        playService.setPlay_mode(RANDOM_PLAY);
                        //Toast.makeText(getApplicationContext(),"随机播放",Toast.LENGTH_SHORT).show();//这句也可以
                        //Toast.makeText(PlayActivity.this, "随机播放", Toast.LENGTH_SHORT).show();//这句也可以
                        Toast.makeText(PlayActivity.this, getString(R.string.random_play), Toast.LENGTH_SHORT).show();
                        break;
                    case RANDOM_PLAY:
                        imageView1_play_mode.setImageResource(R.mipmap.app_mode_single);
                        //imageView1_play_mode.setTag(SINGLE_PLAY);
                        playService.setPlay_mode(SINGLE_PLAY);
                        //Toast.makeText(getApplicationContext(),"单曲循环",Toast.LENGTH_SHORT).show();//这句也可以
                        //Toast.makeText(PlayActivity.this, "单曲循环", Toast.LENGTH_SHORT).show();//这句也可以
                        Toast.makeText(PlayActivity.this, getString(R.string.single_play), Toast.LENGTH_SHORT).show();
                        break;
                    case SINGLE_PLAY:
                        imageView1_play_mode.setImageResource(R.mipmap.app_mode_order);
                        //imageView1_play_mode.setTag(ORDER_PLAY);
                        playService.setPlay_mode(ORDER_PLAY);
                        //Toast.makeText(getApplicationContext(),"顺序播放",Toast.LENGTH_SHORT).show();//这句也可以
                        //Toast.makeText(PlayActivity.this, "顺序播放", Toast.LENGTH_SHORT).show();//这句也可以
                        Toast.makeText(PlayActivity.this, getString(R.string.order_play), Toast.LENGTH_SHORT).show();
                        break;
                }
                break;
            }
            case R.id.imageView1_favorite: {//收藏按钮  //在vo.Mp3Info里  private long mp3InfoId;//在收藏音乐时用于保存原始ID
                Mp3Info mp3Info = playService.mp3Infos.get(playService.getCurrentPosition());//查出歌曲
                System.out.println(mp3Info);
                try {
                    Mp3Info loveMp3Info = app.dbUtils.findFirst(Selector.from(Mp3Info.class).where("mp3InfoId","=",getId(mp3Info)));//查出歌曲,SQL语句
                    System.out.println(loveMp3Info);
                    if (loveMp3Info==null){//返回值为null,则一定需要save
                        System.out.println("不在音乐收藏数据库中 保存音乐数据 原始数据: " + mp3Info);
                        mp3Info.setMp3InfoId(mp3Info.getId());
                        mp3Info.setIsLove(1);
                        System.out.println(mp3Info);
                        app.dbUtils.save(mp3Info);//在音乐收藏数据库 保存音乐
                        System.out.println("save");
                        imageView1_favorite.setImageResource(R.mipmap.app_love_selected);

                        //以下是:调试使用,保存以后再查一遍
                        loveMp3Info = app.dbUtils.findFirst(Selector.from(Mp3Info.class).where("mp3InfoId","=",getId(mp3Info)));//查出歌曲,SQL语句
                        System.out.println("调试使用,保存以后再查一遍 最新数据: " + loveMp3Info);
                    }else {//返回值不为null,则一定需要update
                        System.out.println("在音乐收藏数据库中 更新音乐数据 原始数据: " + loveMp3Info);
                        int isLove = loveMp3Info.getIsLove();
                        if (isLove==1){//返回值不为null,且,isLove为1时;设置isLove为0,同时显示为'未收藏'
                            loveMp3Info.setIsLove(0);
                            imageView1_favorite.setImageResource(R.mipmap.app_love_unselected);
                        }else {//返回值不为null,且,isLove为0时;设置isLove为1,同时显示为'已收藏'
                            loveMp3Info.setIsLove(1);
                            imageView1_favorite.setImageResource(R.mipmap.app_love_selected);
                        }
                        System.out.println("update");
                        app.dbUtils.update(loveMp3Info,"isLove");//更新loveMp3Info数据

                        //以下是:调试使用,更新以后再查一遍
                        loveMp3Info = app.dbUtils.findFirst(Selector.from(Mp3Info.class).where("mp3InfoId", "=", getId(mp3Info)));//查出歌曲,SQL语句
                        System.out.println("调试使用,更新以后再查一遍 最新数据: " + loveMp3Info);
                    }
                } catch (DbException e) {
                    e.printStackTrace();
                }
                break;
            }
            default:
                break;
        }
    }

    //加载歌词
    private void loadLRC(File lrcFile){
        StringBuffer buf = new StringBuffer(1024 * 10);
        char[] chars = new char[1024];
        try {
            BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(lrcFile)));
            int len = -1;
            while ((len = in.read(chars)) != -1){
                buf.append(chars,0,len);
            }
            in.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }catch (IOException e) {
            e.printStackTrace();
        }
        ILrcBuilder builder = new DefaultLrcBuilder();
        List<LrcRow> rows = builder.getLrcRows(buf.toString());
        lrcView.setLrc(rows);
        //加载专辑封面图片为背景的方法(实际使用,发现效果不理想)
        //long id = mp3Info.getMp3InfoId()==0?mp3Info.getId:mp3Info.getMp3InfoId();
        //Bitmap bg = MediaUtils.getArtwork(this, id ,mp3Info.getAlbumId(),false,false);
        //if(bg != null){
        //    lrcView.getBackground(new BitmapDrawable(getResources(),bg));
        //   lrcView.getBackground().setAlpha(120);
        //}
    }

}

activity_music_play如下：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="@dimen/activity_horizontal_margin">

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentStart="true"
        android:layout_gravity="center"
        android:layout_above="@+id/linearLayout3">
    </android.support.v4.view.ViewPager>

    <LinearLayout
        android:id="@+id/linearLayout3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:orientation="vertical"
        android:layout_alignParentBottom="true">

        <LinearLayout
            android:id="@+id/linearLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/textView1_start_time"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="00:00"
                android:textColor="@android:color/darker_gray" />

            <SeekBar
                android:id="@+id/seekBar1"
                android:layout_width="235dp"
                android:layout_height="wrap_content"
                android:indeterminate="false"/>

            <TextView
                android:id="@+id/textView1_end_time"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="00:00"
                android:textColor="@android:color/darker_gray" />

        </LinearLayout>

        <RelativeLayout
            android:id="@+id/linearLayout2"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_marginBottom="10dp"
            android:orientation="horizontal">

            <ImageView
                android:id="@+id/imageView1_play_mode"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@mipmap/app_music_order"
                android:layout_alignBottom="@+id/imageView3_previous"
                android:layout_alignParentStart="true" />

            <ImageView
                android:id="@+id/imageView1_favorite"
                android:layout_width="40dp"
                android:layout_height="40dp"
                android:src="@mipmap/app_love_unselected"
                android:layout_alignParentTop="true"
                android:layout_toEndOf="@+id/imageView1_play_mode"
                android:layout_marginTop="15dp"
                android:layout_marginStart="50dp" />

            <ImageView
                android:id="@+id/imageView3_previous"
                android:layout_width="50dp"
                android:layout_height="50dp"
                android:layout_alignTop="@+id/imageView2_play_pause"
                android:layout_toLeftOf="@+id/imageView2_play_pause"
                android:src="@mipmap/app_music_previous" />

            <ImageView
                android:id="@+id/imageView2_play_pause"
                android:layout_width="50dp"
                android:layout_height="50dp"
                android:layout_alignTop="@+id/imageView1_next"
                android:layout_toLeftOf="@+id/imageView1_next"
                android:src="@mipmap/app_music_play" />

            <ImageView
                android:id="@+id/imageView1_next"
                android:layout_width="50dp"
                android:layout_height="50dp"
                android:layout_alignParentBottom="true"
                android:layout_alignParentRight="true"
                android:src="@mipmap/app_music_next" />

        </RelativeLayout>

    </LinearLayout>

</RelativeLayout>

ViewPagerAdapter如下：

package com.iwanghang.drmplayer.adapter;

import android.content.Context;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

/**
 * Created by iwanghang on 16/5/10.
 * ViewPagerAdapter
 */
public class ViewPagerAdapter extends PagerAdapter {
    private List<View> list;
    private Context context;

    public ViewPagerAdapter(List<View> list) {
        this.list = list;
    }

    public ViewPagerAdapter(List<View> list,Context context) {
        this.list = list;
        this.context = context;
    }

    @Override
    public int getCount() {
        if (list != null && list.size() > 0) {
            return list.size();
        } else {
            return 0;
        }
    }

    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
        return arg0 == arg1;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View) object);
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        container.addView(list.get(position));
        return list.get(position);
    }

    @Override
    public int getItemPosition(Object object) {
        return POSITION_NONE;
    }

}