Android自定义AppGlideModule,DataFetcher ,ModelLoaderFactory,ModelLoader,Kotlin(1)

假设实现一个简单的功能，对传入要加载的path路径增加一定的筛选、容错或“重定向”，需要自定义一个模型，基于这个模型，让Glide自动匹配模型展开加载。

 

plugins {id 'org.jetbrains.kotlin.kapt'
}

 

    implementation 'com.github.bumptech.glide:glide:4.16.0'kapt 'com.github.bumptech.glide:compiler:4.16.0'

 

import android.content.Context
import android.util.Log
import com.bumptech.glide.Glide
import com.bumptech.glide.GlideBuilder
import com.bumptech.glide.Registry
import com.bumptech.glide.annotation.GlideModule
import com.bumptech.glide.module.AppGlideModule
import java.io.InputStream@GlideModule
class MyGlideModule : AppGlideModule() {override fun applyOptions(context: Context, builder: GlideBuilder) {super.applyOptions(context, builder)builder.setLogLevel(Log.DEBUG)}override fun registerComponents(context: Context, glide: Glide, registry: Registry) {super.registerComponents(context, glide, registry)registry.append(VideoCover::class.java,InputStream::class.java,VideoCoverLoaderFactory())}
}

 

class VideoCover {var path: String? = nullconstructor(path: String) {this.path = path}
}

 

 

import android.content.res.Resources
import android.graphics.Bitmap
import android.graphics.Bitmap.CompressFormat
import android.graphics.BitmapFactory
import android.util.Log
import com.bumptech.glide.Priority
import com.bumptech.glide.load.DataSource
import com.bumptech.glide.load.data.DataFetcher
import java.io.ByteArrayInputStream
import java.io.ByteArrayOutputStream
import java.io.InputStreamclass VideoCoverFetcher : DataFetcher<InputStream> {val TAG = "Glide/VideoCoverFetcher"private var model: VideoCover? = nullprivate val resId = android.R.drawable.stat_notify_errorconstructor(model: VideoCover) {this.model = model}override fun loadData(priority: Priority, callback: DataFetcher.DataCallback<in InputStream>) {val bmp = BitmapFactory.decodeResource(Resources.getSystem(), resId)Log.d(TAG, "loadData ${bmp.byteCount}")callback.onDataReady(ByteArrayInputStream(bitmapToByteArray(bmp)))}override fun cleanup() {Log.d(TAG, "cleanup")}override fun cancel() {Log.d(TAG, "cancel")}override fun getDataClass(): Class<InputStream> {return InputStream::class.java}override fun getDataSource(): DataSource {return DataSource.LOCAL}private fun bitmapToByteArray(bitmap: Bitmap): ByteArray {val bos = ByteArrayOutputStream()bitmap.compress(CompressFormat.PNG, 0, bos)return bos.toByteArray()}
}

 

 

 

import android.util.Log
import com.bumptech.glide.load.model.ModelLoader
import com.bumptech.glide.load.model.ModelLoaderFactory
import com.bumptech.glide.load.model.MultiModelLoaderFactory
import java.io.InputStreamclass VideoCoverLoaderFactory : ModelLoaderFactory<VideoCover, InputStream> {val TAG = "Glide/VideoCoverLoaderFactory"override fun build(multiFactory: MultiModelLoaderFactory): ModelLoader<VideoCover, InputStream> {return VideoCoverModuleLoader()}override fun teardown() {Log.d(TAG, "teardown")}
}

 

 

 

import android.util.Log
import com.bumptech.glide.load.Options
import com.bumptech.glide.load.model.ModelLoader
import com.bumptech.glide.load.model.ModelLoader.LoadData
import com.bumptech.glide.signature.ObjectKey
import java.io.InputStreamclass VideoCoverModuleLoader : ModelLoader<VideoCover, InputStream> {val TAG = "Glide/VideoCoverModuleLoader"override fun buildLoadData(model: VideoCover,width: Int,height: Int,options: Options): ModelLoader.LoadData<InputStream>? {Log.d(TAG, "buildLoadData")return LoadData(VideoCoverSignature(model.path!!), //简单时候可以考虑ObjectKey(model.path!!)VideoCoverFetcher(model))}override fun handles(model: VideoCover): Boolean {return true}
}

 

 

 

import com.bumptech.glide.load.Key
import java.security.MessageDigestclass VideoCoverSignature() : Key {private var path: String? = nullconstructor(path: String) : this() {this.path = path}override fun updateDiskCacheKey(messageDigest: MessageDigest) {val ba: ByteArray = path?.toByteArray()!!messageDigest.update(ba, 0, ba.size)}
}

 

 

import android.graphics.drawable.Drawable
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.ImageView
import com.bumptech.glide.load.DataSource
import com.bumptech.glide.load.engine.DiskCacheStrategy
import com.bumptech.glide.load.engine.GlideException
import com.bumptech.glide.request.RequestListener
import com.bumptech.glide.request.target.Target
import com.bumptech.glide.signature.ObjectKeyclass MainActivity : AppCompatActivity() {val TAG = "Glide/MainActivity"private var image: ImageView? = nulloverride fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)val path = "xxx"image = findViewById<ImageView>(R.id.image)GlideApp.with(this).load(VideoCover(path)).diskCacheStrategy(DiskCacheStrategy.RESOURCE)//.signature(ObjectKey(path)).addListener(object : RequestListener<Drawable> {override fun onLoadFailed(e: GlideException?,model: Any?,target: Target<Drawable>,isFirstResource: Boolean): Boolean {Log.d(TAG, "onLoadFailed")return false}override fun onResourceReady(resource: Drawable,model: Any,target: Target<Drawable>?,dataSource: DataSource,isFirstResource: Boolean): Boolean {Log.d(TAG, "onResourceReady")return false}}).override(500).into(image!!)}
}

 

 

 

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