Android Glide, first start based on loadThumbnail, Kotlin（一）

Android Glide, first start based on loadThumbnail, Kotlin（一）

import android.content.ContentValues
import android.content.Context
import android.graphics.Color
import android.graphics.drawable.Drawable
import android.net.Uri
import android.os.Bundle
import android.provider.MediaStore
import android.text.TextUtils
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.AppCompatImageView
import androidx.core.content.ContextCompat
import androidx.core.view.setPadding
import androidx.lifecycle.lifecycleScope
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext
import java.text.SimpleDateFormat

class MainActivity : AppCompatActivity() {
    companion object {
        const val TAG = "glide-fly"

        const val SIZE = 450

        const val VIEW_TYPE = 0
        const val DATE_TYPE = 1

        const val SPAN_COUNT = 6

        const val PAD_SIZE = 1

        var FIRST_START = true
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val rv: RecyclerView = findViewById(R.id.rv)

        rv.setHasFixedSize(true)
        rv.setItemViewCacheSize(SPAN_COUNT * 10)

        /*
        rv.setRecyclerListener(object : RecyclerListener {
            override fun onViewRecycled(holder: RecyclerView.ViewHolder) {
                if ((holder as MyVH).itemView is MyIV) {
                    GlideApp.with(holder.itemView.context).clear(holder.itemView)
                }
            }
        })
         */

        val layoutManager = MyGridLayoutManager(this, SPAN_COUNT)
        layoutManager.orientation = LinearLayoutManager.VERTICAL
        rv.layoutManager = layoutManager

        val adapter = MyAdapter(this)
        rv.adapter = adapter

        lifecycleScope.launch(Dispatchers.IO) {
            val items = readAllImage(this@MainActivity)

            items.sortByDescending {
                it.dateModified
            }

            val lists = items.distinctBy {
                it.dateString
            }

            lists.forEach { it_lists ->
                val idx = items.indexOfFirst {
                    it_lists.dateString == it.dateString
                }

                val data = MyData()
                data.type = DATE_TYPE
                data.dateString = it_lists.dateString
                items.add(idx, data) //不要直接加 it_Lists，这里面涉及到List的深拷贝/浅拷贝问题。
            }

            withContext(Dispatchers.Main) {
                adapter.dataChanged(items)
            }
        }

        layoutManager.spanSizeLookup = object : GridLayoutManager.SpanSizeLookup() {
            override fun getSpanSize(position: Int): Int {
                return if (adapter.getItemViewType(position) == DATE_TYPE) {
                    //group，标题
                    SPAN_COUNT
                } else {
                    //单个小格子
                    1
                }
            }
        }
    }

    class MyGridLayoutManager : GridLayoutManager {
        constructor(ctx: Context, cnt: Int) : super(ctx, cnt) {

        }

        override fun getExtraLayoutSpace(state: RecyclerView.State?): Int {
            return 1000
        }
    }

    class MyAdapter : RecyclerView.Adapter<MyVH> {
        private var mItems = arrayListOf<MyData>()

        private var mContext: Context? = null
        private var mPlaceholder: Drawable? = null
        private var mError: Drawable? = null

        constructor(ctx: Context) {
            mContext = ctx

            mPlaceholder = ContextCompat.getDrawable(mContext!!, android.R.drawable.ic_menu_gallery)
            mError = ContextCompat.getDrawable(mContext!!, android.R.drawable.stat_notify_error)
        }

        fun dataChanged(items: ArrayList<MyData>) {
            this.mItems = items
            notifyDataSetChanged()
        }

        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyVH {
            var v: View?
            if (viewType == VIEW_TYPE) {
                v = MyIV(mContext!!)
            } else {
                v = LayoutInflater.from(mContext!!).inflate(android.R.layout.simple_list_item_1, null)
                v.setBackgroundColor(Color.LTGRAY)
            }

            return MyVH(v!!)
        }

        override fun getItemCount(): Int {
            return mItems.size
        }

        override fun getItemViewType(position: Int): Int {
            return mItems[position].type
        }

        private fun getImageUri(context: Context, filePath: String): Uri? {
            val cursor = context.contentResolver.query(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                arrayOf(MediaStore.Images.Media._ID),
                MediaStore.Images.Media.DATA + "=? ",
                arrayOf(filePath),
                null
            )

            return if (cursor != null && cursor.moveToFirst()) {
                val id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.MediaColumns._ID))
                val baseUri = Uri.parse("content://media/external/images/media")
                Uri.withAppendedPath(baseUri, "" + id)
            } else {
                val values = ContentValues()
                values.put(MediaStore.Images.Media.DATA, filePath)
                context.contentResolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values)
            }
        }

        override fun onBindViewHolder(holder: MyVH, position: Int) {
            val type = getItemViewType(position)
            if (type == VIEW_TYPE) {
                val path = mItems[holder.adapterPosition].path
                val miv = holder.itemView as MyIV

                if (position > 50) {
                    FIRST_START = false
                }

                if (FIRST_START && position < 50) {
                    miv.setImageDrawable(mPlaceholder)

                    val uri = getImageUri(mContext!!, path!!)
                    QuickLoader.Instance().start(mContext!!, uri!!, miv)
                } else {
                    GlideApp.with(mContext!!)
                        .asBitmap()
                        .load(path)
                        .centerCrop()
                        .override(SIZE)
                        .placeholder(mPlaceholder)
                        .error(mError)
                        .into(miv)
                }
            } else if (type == DATE_TYPE) {
                holder.itemView.findViewById<TextView>(android.R.id.text1).text = "${mItems[position].dateString}"
            }
        }
    }

    class MyVH : RecyclerView.ViewHolder {
        constructor(itemView: View) : super(itemView) {

        }
    }

    class MyIV : AppCompatImageView {
        constructor(ctx: Context) : super(ctx) {
            setPadding(PAD_SIZE)
        }

        override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec)
            val w = MeasureSpec.getSize(widthMeasureSpec)
            val h = MeasureSpec.getSize(heightMeasureSpec)
            val size = Math.max(w, h) //取w,h的最大值。
            setMeasuredDimension(size, size) //使得ImageView为正方形。
        }
    }

    class MyData {
        var type = VIEW_TYPE

        var dateModified: Long? = 0L
        var dateString: String? = null
        var path: String? = null
        var index: Int? = null

        override fun toString(): String {
            return "MyData(type=$type, dateModified=$dateModified, dateString=$dateString, path=$path, index=$index)"
        }
    }

    private fun readAllImage(context: Context): ArrayList<MyData> {
        val photos = ArrayList<MyData>()

        //读取所有图片
        val cursor = context.contentResolver.query(
            MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null, null
        )

        var index = 0
        val sdf = SimpleDateFormat("yyyy-MM-dd")
        while (cursor!!.moveToNext()) {
            //路径 uri
            val path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA))
            if (TextUtils.isEmpty(path)) {
                continue
            }

            val dateModified = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATE_MODIFIED))

            //图片名称
            //val name = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DISPLAY_NAME))
            //图片大小
            //val size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.SIZE))

            val dateStr = sdf.format(dateModified?.toLong()!! * 1000)

            val data = MyData()
            data.type = VIEW_TYPE
            data.path = path
            data.dateModified = dateModified.toLong()
            data.dateString = dateStr
            data.index = index++

            photos.add(data)
        }
        cursor.close()

        return photos
    }
}

import android.content.Context
import android.net.Uri
import android.os.Handler
import android.os.Looper
import android.os.Message
import android.util.Log
import android.util.Size
import androidx.appcompat.app.AppCompatActivity
import java.util.concurrent.Executors


class QuickLoader {
    private var mHandler: MsgHandler? = null

    companion object {
        const val THREAD_NUMBER = 4

        const val WHAT = 0xf01

        private val inst by lazy(mode = LazyThreadSafetyMode.SYNCHRONIZED) { QuickLoader() }
        fun Instance() = inst
    }

    private constructor() {
        Log.d(MainActivity.TAG, "QuickLoader 初始化")
        mHandler = MsgHandler()
    }

    fun start(ctx: Context, uri: Uri, miv: MainActivity.MyIV) {
        val msg = mHandler?.obtainMessage(WHAT)
        msg?.obj = LoadTask(ctx, uri, miv)
        mHandler?.sendMessage(msg!!)
    }

    private class MsgHandler : Handler {
        private var mExecutorService = Executors.newFixedThreadPool(THREAD_NUMBER)

        constructor() : super(Looper.getMainLooper()) {
            Log.d(MainActivity.TAG, "MsgHandler 初始化")
        }

        override fun handleMessage(msg: Message) {
            mExecutorService.execute(msg.obj as LoadTask)
        }

        fun destroy() {
            removeMessages(WHAT)

            mExecutorService.shutdownNow()
            mExecutorService = null
        }
    }

    class LoadTask(private val ctx: Context, private val uri: Uri, private val miv: MainActivity.MyIV) : Runnable {
        override fun run() {
            Log.d(MainActivity.TAG, "run $uri")

            val t = System.currentTimeMillis()
            val bmp = ctx.contentResolver?.loadThumbnail(uri, Size(MainActivity.SIZE, MainActivity.SIZE), null)
            Log.d(MainActivity.TAG, "LoadTask 耗时:${System.currentTimeMillis() - t} $uri")

            (ctx as AppCompatActivity).runOnUiThread {
                miv.setImageBitmap(bmp)
            }
        }
    }

    fun destroy() {
        mHandler?.destroy()
        mHandler = null
    }
}

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