网站如何做原创,网站建设服务费属于,直播app开发平台软件,应用界面设计Android Glide自定义AppCompatImageView切分成若干小格子#xff0c;每个小格子onDraw绘制Bitmap#xff0c;Kotlin#xff08;1#xff09; 垂直方向的RecyclerView#xff0c;每行一个AppCompatImageView#xff0c;每个AppCompatImageView被均匀切割成n个小格子#…Android Glide自定义AppCompatImageView切分成若干小格子每个小格子onDraw绘制BitmapKotlin1 垂直方向的RecyclerView每行一个AppCompatImageView每个AppCompatImageView被均匀切割成n个小格子 每个小格子通过Glide加载出来Bitmap然后onDraw绘制整行。 uses-permission android:nameandroid.permission.READ_EXTERNAL_STORAGE /uses-permission android:nameandroid.permission.READ_MEDIA_IMAGES / implementation(com.github.bumptech.glide:glide:4.16.0) import android.content.Context
import android.os.Bundle
import android.provider.MediaStore
import android.util.Log
import android.view.ViewGroup
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContextclass MainActivity : AppCompatActivity() {companion object {const val VIEW_TYPE 0const val TAG fly/MainActivity}override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)val rv findViewByIdRecyclerView(R.id.recycler_view)val layoutManager LinearLayoutManager(this)layoutManager.orientation LinearLayoutManager.VERTICALrv.layoutManager layoutManagerval adapter MyAdapter()rv.adapter adapterlifecycleScope.launch(Dispatchers.IO) {val items readAllImage(thisMainActivity)items.reverse()val data sliceDataList(items)withContext(Dispatchers.Main) {adapter.dataChanged(data)}}}private fun sliceDataList(data: ArrayListMyData): ArrayListArrayListMyData {var k: Intval lists ArrayListArrayListMyData()for (i in data.indices step BatchBitmapView.ROW_SIZE) {val temp ArrayListMyData()k 0for (j in 0 until BatchBitmapView.ROW_SIZE) {k i jif (k data.size) {break}temp.add(data[k])}lists.add(temp)}return lists}class MyAdapter : RecyclerView.AdapterMyVH() {private var items ArrayListArrayListMyData()fun dataChanged(items: ArrayListArrayListMyData) {this.items itemsnotifyDataSetChanged()}override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyVH {Log.d(TAG, onCreateViewHolder)val view BatchBitmapView(parent.context)return MyVH(view)}override fun getItemCount(): Int {return items.size}override fun getItemViewType(position: Int): Int {return VIEW_TYPE}override fun onBindViewHolder(holder: MyVH, position: Int) {Log.d(TAG, onBindViewHolder $position)val biv (holder.itemView as? BatchBitmapView)biv?.setRowBitmapData(items[position], position)}}class MyVH(itemView: BatchBitmapView) : RecyclerView.ViewHolder(itemView) {}class MyData(var path: String, var index: Int)private fun readAllImage(context: Context): ArrayListMyData {val photos ArrayListMyData()//读取所有图片val cursor context.contentResolver.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null, null)var index 0while (cursor!!.moveToNext()) {//路径 urival path cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA))//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))photos.add(MyData(path, index))}cursor.close()return photos}
} import android.content.Context
import android.graphics.Bitmap
import android.graphics.Canvas
import android.graphics.drawable.Drawable
import android.util.AttributeSet
import android.util.Log
import androidx.appcompat.widget.AppCompatImageView
import com.bumptech.glide.Glide
import com.bumptech.glide.request.target.CustomTarget
import com.bumptech.glide.request.transition.Transitionclass BatchBitmapView JvmOverloads constructor(context: Context,attributeSet: AttributeSet? null,defStyleAttr: Int 0
) : AppCompatImageView(context, attributeSet, defStyleAttr) {private val mData mutableListOfDataBean()private val mScreenWidth resources.displayMetrics.widthPixelsprivate val mTargets mutableListOfCustomTargetBitmap()companion object {const val TAG fly/BatchBitmapViewconst val ROW_SIZE 16 //一行多少个bitmapconst val IMAGE_SIZE 80 //每个小格子图片的尺寸}fun setRowBitmapData(rows: ArrayListMainActivity.MyData?, position: Int) {Log.d(TAG, setRowBitmapData $position)mData.clear()Log.d(TAG, mTargets.size${mTargets.size})mTargets.forEach {Glide.with(context).clear(it) //如果不清楚会发生有些图错放位置。}mTargets.clear() //mTargets上下滑动列表会越来越大清空一直保持ROW_SIZE.rows?.forEachIndexed { index, myData -val target object : CustomTargetBitmap() {override fun onResourceReady(resource: Bitmap, transition: Transitionin Bitmap?) {val bean DataBean(resource)mData.add(bean)postInvalidate()}override fun onLoadCleared(placeholder: Drawable?) {}}Glide.with(context).asBitmap().centerCrop().override(IMAGE_SIZE).load(myData.path).into(target)mTargets.add(target)}}override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {super.onMeasure(widthMeasureSpec, heightMeasureSpec)setMeasuredDimension(mScreenWidth, IMAGE_SIZE)}override fun onDraw(canvas: Canvas) {super.onDraw(canvas)mData.forEachIndexed { index, dataBean -canvas.save()var left (mScreenWidth / ROW_SIZE) * indexcanvas.drawBitmap(dataBean.bitmap, left.toFloat(), 0f, null)canvas.restore()}}data class DataBean(val bitmap: Bitmap)
}
上面每一行加载16个bitmap绘图速度很快因为是canvas直接绘图。但是如果使用下文的方式
Android LinearLayout dynamic add child ImageViewGlide loadkotlin_zhangphil的博客-CSDN博客文章浏览阅读645次。【代码】Android Paging 3,kotlin1在实际的开发中虽然Glide解决了快速加载图片的问题但还有一个问题悬而未决比如用户的头像往往用户的头像是从服务器端读出的一个普通矩形图片但是现在的设计一般要求在APP端的用户头像显示成圆形头像那么此时虽然Glide可以加载但加载出来的是一个矩形如果要Glide_android 毛玻璃圆角。《Android图片加载与缓存开源框架Android Glide》Android Glide是一个开源的图片加载和缓存处理的第三方框架。https://blog.csdn.net/zhangphil/article/details/132080406即每一行先初始化一个水平的线性布局然后逐个添加16个ImageView对比发现明显卡顿因为是以ViewGroup的方式布局摆放子view形成View。 Android Glide CustomTarget ,kotlin-CSDN博客文章浏览阅读1.4k次。【代码】Android Paging 3,kotlin1在实际的开发中虽然Glide解决了快速加载图片的问题但还有一个问题悬而未决比如用户的头像往往用户的头像是从服务器端读出的一个普通矩形图片但是现在的设计一般要求在APP端的用户头像显示成圆形头像那么此时虽然Glide可以加载但加载出来的是一个矩形如果要Glide_android 毛玻璃圆角。《Android图片加载与缓存开源框架Android Glide》Android Glide是一个开源的图片加载和缓存处理的第三方框架。https://blog.csdn.net/zhangphil/article/details/131661819
