[移动开发]女朋友说系统自带音乐播放器太臃肿不好用，用Kotlin捋了个本地音乐播放器

代码结构：

这一次也是将MVP与JetPack进行了一个融合，这个框架断断续续维护了有大半年，写起逻辑来非常快且清晰，开源看一下示例：

/**
 * 展示某个歌手的所有歌曲
 */
class ArtistSongActivity : MusicActivity<ActivityArtistSongBinding>() {
    private val songList = arrayListOf<SongBean>()
    private lateinit var mAdapter: SongAdapter
    private val artistSongPresenter by lazy<ArtistSongActivity, ArtistSongPresenter>()

    companion object {
        const val KEY_ARTIST_NAME = "key_artist_name"
    }

    override fun onBindingInflate(): ActivityArtistSongBinding {
        return ActivityArtistSongBinding.inflate(layoutInflater)
    }

    override fun onInit() {
        ActivityTools.swipeActivity(this)
        val artistName = intent.getStringExtra(KEY_ARTIST_NAME)
        binding.tvArtist.text = artistName

        //expandClickSpace(binding.ivBack)
        binding.ivBack.expandClick(16.0f)
        binding.ivBack.setOnClickListener {
            onBackPressed()
        }

        binding.fabPlaying.setSingleClick {
            if (PlayManager.currentSong == null) {
                ToastUtils.showShort("没有正在播放的歌曲")
                return@setSingleClick
            }
            // 跳转详情
            openActivity<MusicDetailActivity>()
        }
        binding.fabPlaying.setOnLongClickListener {
            // 长按暂停或者恢复播放
            PlayManager.togglePlay()
            true
        }

        mAdapter = SongAdapter(songList, CurrentListType.ARTIST)
        binding.rvArtistSong.run {
            layoutManager = LinearLayoutManager(context)
            adapter = mAdapter
        }
        // 设置空View之前必须先绑定RecyclerView
        mAdapter.setEmptyView(R.layout.view_empty)

        if (!TextUtils.isEmpty(artistName)) {
            artistSongPresenter.sortArtistSong(artistName!!)
        }
    }

    fun onSongSorted(currentSongs : List<SongBean>) {
        songList.addAll(currentSongs)
        mAdapter.notifyDataSetChanged()
    }
}

package com.itant.music.main.artist.song

import com.itant.music.main.artist.ArtistManager
import com.itant.music.manager.PlayManager
import com.itant.music.utils.PinyinUtils
import com.miekir.common.widget.loading.LoadingType
import com.miekir.mvp.presenter.BasePresenter
import com.miekir.task.extension.launchTask
import java.util.*

class ArtistSongPresenter : BasePresenter<ArtistSongActivity>() {

    fun sortArtistSong(artistName: String) {
        launchTask(
            {
                val currentList = ArtistManager.artistSongMap[artistName]
                PlayManager.currentSongList.clear()
                if (currentList != null) {
                    // 按拼音排序
                    Collections.sort(currentList, kotlin.Comparator { song1, song2 ->
                        PinyinUtils.ccs2Pinyin(song1.title)
                            .compareTo(PinyinUtils.ccs2Pinyin(song2.title), ignoreCase = true)
                    })
                    PlayManager.currentSongList.addAll(currentList)
                }

                PlayManager.currentSongList
            }, onResult = { success, result, code, message ->
                if (result != null) {
                    view?.onSongSorted(result)
                }
            }, loadingType = LoadingType.INVISIBLE
        )
    }
}

效果：


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