网上搜索这个 Android写入专辑图的资料少之又少，都是读取的，这里我找到了一个方法，然后自己做了个写入专辑图的小工具，有需要的童鞋可以参考一下。
先上效果图：
依赖第三方库：jaudiotagger（java）、Okhttp
demo语言：Kotlin
不会kotlin的小伙伴别慌，我也是边学kotlin先写的这个demo，看过kotlin基础语法的小伙伴应该还是比较好理解的。
核心写入代码：
//path：本地音乐文件路径；picFile：本地图片文件（网络图片的话我这边的做法是保存到本地再用路径new一个文件）
fun writeTag(path: String?, picFile: File?) {
val mp3File = MP3File(path)
if (mp3File.hasID3v2Tag()) {
mp3File.run {
val artWork = ArtworkFactory.createArtworkFromFile(picFile)
iD3v2Tag.setField(artWork)
save()
}
}
}三步：
- 首先我们要获取本地所有音乐文件
- 然后点击某个item为它搜索专辑图（这里用网易云音乐搜索API）
- 最后就是写入
存储权限什么的这里就不写了，可以参考demo或者自己经验写。下面是获取本地音乐文件列表：
/**
* 得到媒体的音乐文件列表
*/
private fun getMusicList(): MutableList<SongBean> {
val list: MutableList<SongBean> = ArrayList()
val cursor: Cursor? = this.contentResolver.query(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
null,
null,
null,
MediaStore.Audio.AudioColumns.IS_MUSIC
)
if (cursor != null) {
var song: SongBean
while (cursor.moveToNext()) {
var singer = ""
var name = ""
val path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA))
val split = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME))
.split("-")
val size = split.size
when {
size == 1 -> {
name = split[0]
}
size == 2 -> {
singer = split[0]
name = split[1]
}
size > 2 -> {
name = split.last()
for (i in 0 until size-1){
singer += " "+split[i]
}
}
}
song = SongBean(name.replace(".mp3", "").trim(), singer.trim(), path)
list.add(song)
}
cursor.close()
}
list.reverse()
return list
}这个SongBean是装音乐的实体，里面有歌名、歌手、路径（搜索歌曲的话这个路径用来存储图片链接）：
class SongBean() :Parcelable{
var name:String? = null
var singer:String? = null
var path:String? = null
constructor(parcel: Parcel) : this() {
name = parcel.readString()
singer = parcel.readString()
path = parcel.readString()
}
constructor(name: String?, singer: String?, path: String?) : this(){
this.name = name
this.singer = singer
this.path = path
}
override fun writeToParcel(parcel: Parcel, flags: Int) {
parcel.writeString(name)
parcel.writeString(singer)
parcel.writeString(path)
}
override fun describeContents(): Int {
return 0
}
companion object CREATOR : Parcelable.Creator<SongBean> {
override fun createFromParcel(parcel: Parcel): SongBean {
return SongBean(parcel)
}
override fun newArray(size: Int): Array<SongBean?> {
return arrayOfNulls(size)
}
}
fun getArtBitmap(): Bitmap? {
val myRetriever = MediaMetadataRetriever()
try {
myRetriever.setDataSource(path) // the URI of audio file
} catch (e: Exception) {
Log.e("error", "getArtBitmapError: $e")
return null
}
val artwork = myRetriever.embeddedPicture
return if (artwork != null) {
BitmapFactory.decodeByteArray(artwork, 0, artwork.size)
} else {
null
}
}
}这个SongBean里面实现了序列化，因为列表item点击之后我们要把这个item的数据传到下一个界面。然后最后面这个getArtBitmap方法是原生的用来获取歌曲自带专辑图的方法，待会列表展示的时候要用到。
初始化界面的时候，把歌曲列表给到RecyclerView，展示给用户：
item的布局很简单，就垂直并列的三个TextView加上最右边的ImageView：（三个TextView的id分别是tv1、tv2、tv3，图片id是img）
列表的适配器：
class MyListAdapter(private val data: MutableList<SongBean>) :
RecyclerView.Adapter<MyListAdapter.MyViewHolder>() {
private val TAG = "MyListAdapter"
class MyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView)
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
return MyViewHolder(
LayoutInflater.from(parent.context).inflate(
R.layout.adapter_item,parent, false
)
)
}
override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
holder.itemView.apply {
tv1.text = data[position].name
tv2.text = data[position].singer
tv3.text = data[position].path
if(tv3.text.startsWith("http")){
Log.i(TAG, "load_picture:${data[position].path}")
img.visibility = View.VISIBLE
img.load(data[position].path){
crossfade(true)
}
}else{
val artBitmap = data[position].getArtBitmap()
if(artBitmap != null){
img.visibility = View.VISIBLE
img.setImageBitmap(artBitmap)
}else{
img.visibility = View.GONE
}
}
setOnClickListener{
listener?.setOnItemClickListener(data[position],position)
}
}
}
override fun getItemCount(): Int = data.size
private var listener:OnListener? = null
fun setListener(listener:OnListener){
this.listener = listener
}
interface OnListener{
fun setOnItemClickListener(bean: SongBean,position: Int)
}
fun setNewData(newData: List<SongBean>){
data.clear()
data.addAll(newData)
notifyDataSetChanged()
}
}给recyclerView赋值：
allList = getMusicList()
recycler.adapter = adapter
recycler.layoutManager = LinearLayoutManager(this)
adapter.setListener(object : MyListAdapter.OnListener {
override fun setOnItemClickListener(bean: SongBean,position:Int) {
this@ListActivity.position = position
val intent = Intent(this@ListActivity, MatchActivity::class.java)
intent.putExtra("data", bean)
startActivityForResult(intent,1000)
}
})
adapter.setNewData(allList)这里用startActivityForResult是因为待会在下一个界面如果写入专辑图成功的话，返回出来需要更新这个item的右边图片，所以这个页面我把点击的position保存到全局变量里面。
到达下一个界面了之后，就搜索歌手+歌名，用的oktttp。
网易云歌曲搜索api：
fun search(name: String?, singer: String?) {
btn_search.isEnabled = false
btn_search.text = "搜索中……"
if (TextUtils.isEmpty(name) && TextUtils.isEmpty(singer)) {
Toast.makeText(this, "请输入歌曲信息", Toast.LENGTH_SHORT).show()
return
}
val word = singer?.trim() + name?.trim()
val url = "http://music.163.com/api/search/pc?csrf_token=hlpretag=&hlposttag=&s=$word&type=1&offset=0&total=true&limit=20"
Log.i(TAG, "search: $url")
val okHttpClient = OkHttpClient()
val request: Request = Request.Builder()
.url(url)
.header("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64)")
.build()
val call = okHttpClient.newCall(request)
call.enqueue(object : Callback {
override fun onFailure(call: Call, e: IOException) {
//失败处理
btn_search.isEnabled = true
btn_search.text = "搜索"
Toast.makeText(applicationContext, "请求失败", Toast.LENGTH_SHORT).show()
}
override fun onResponse(call: Call, response: Response) {
val jsonObject = JSONObject(response.body()!!.string())
runOnUiThread {
btn_search.isEnabled = true
btn_search.text = "搜索"
val code: Int = jsonObject.getInt("code")
if (code == 200) {
val jsonArray = jsonObject.getJSONObject("result")
.getJSONArray("songs")
val list = ArrayList<SongBean>()
for (i in 0 until jsonArray.length()) {
val item = jsonArray.get(i) as JSONObject
val singerArr = item.getJSONArray("artists")
var singerStr = ""
for (j in 0 until singerArr.length()){
val singerObj = singerArr.get(j) as JSONObject
singerStr += singerObj.get("name")
singerStr += " "
}
list.add(
SongBean(
item.getString("name"),
singerStr,
item.getJSONObject("album").getString("picUrl")
)
)
}
adapter.setNewData(list)
if (adapter.itemCount == 0) {
Toast.makeText(applicationContext, "什么都没有搜到", Toast.LENGTH_SHORT).show()
}
} else {
Toast.makeText(applicationContext, "服务器数据错误", Toast.LENGTH_SHORT).show()
}
}
}
})
}设置列表的点击事件，确定写入弹框防误触：（这里我以为写入是个耗时操作，实际现象并不会耗时，秒写入）
adapter.setListener(object : MyListAdapter.OnListener {
override fun setOnItemClickListener(bean: SongBean,position:Int) {
val url = bean.path
val img = ImageView(applicationContext)
img.load(url)
alert("写入专辑图", "确定写入吗？") {
negativeButton("下次一定") {}
positiveButton("写入") {
// indeterminateProgressDialog("正在写入")
val request = ImageRequest.Builder(this@MatchActivity)
.data(bean.path)
.target { drawable ->
// Handle the result.
val bitmapDrawable: BitmapDrawable = drawable as BitmapDrawable
val bitmap: Bitmap = bitmapDrawable.bitmap
val filePath = "${filesDir.absoluteFile}/temp.jpg";
Log.i(TAG, "filePath: $filePath")
val file = bitmapToFile(
filePath,
bitmap, 80
)
Log.i(TAG, "BitmapFilePath: ${file?.absoluteFile}")
writeTag(path, File(filePath))
}
.build()
val disposable = imageLoader.enqueue(request)
}
}.show()
}
})这里用到的保存bitmap到本地，还有写入专辑图的方法
/**
* bitmap保存为file
*/
@Throws(IOException::class)
fun bitmapToFile(
filePath: String,
bitmap: Bitmap?, quality: Int
) : File? {
if (bitmap != null) {
val file = File(
filePath.substring(
0,
filePath.lastIndexOf(File.separator)
)
)
if (!file.exists()) {
file.mkdirs()
}
val bos = BufferedOutputStream(
FileOutputStream(filePath)
)
bitmap.compress(Bitmap.CompressFormat.JPEG, quality, bos)
bos.flush()
bos.close()
return file
}
return null
}
/**
* 写入专辑图
*/
fun writeTag(path: String?, picFile: File?) {
val mp3File = MP3File(path)
if (mp3File.hasID3v2Tag()) {
mp3File.run {
val artWork = ArtworkFactory.createArtworkFromFile(picFile)
iD3v2Tag.setField(artWork)
save()
Toast.makeText(applicationContext, "写入完成", Toast.LENGTH_SHORT).show()
setResult(1001)
}
}else{
Toast.makeText(applicationContext, "此歌曲没有ID3v2Tag", Toast.LENGTH_SHORT).show()
}
}写入专辑图我也是百度搜的方法，这里判断了本地音乐文件需要有ID3v2Tag才能写入，我测试写了ID3v1Tag.setField确实没有作用，我自己的本地歌曲确实有那么几首是这样的，如果有知道的大佬可以指点一二。不过大部分歌曲都是有这个id3v2tag的。
至此所有核心方法都已给出。具体代码可以参照demo，代码我已上传GitHub：https://github.com/xaEHu/Mp3TagTool
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