Android矩阵Matrix实现Glide图像fitCenter转换为centerCrop，Kotlin

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"tools:context=".MainActivity"><ImageViewandroid:id="@+id/image1"android:layout_width="500px"android:layout_height="500px"android:background="@android:color/holo_green_light" /><ImageViewandroid:id="@+id/image2"android:layout_width="500px"android:layout_height="500px"android:background="@android:color/holo_blue_light" /><ImageViewandroid:id="@+id/image3"android:layout_width="500px"android:layout_height="500px"android:background="@android:color/holo_red_light" /><ImageViewandroid:id="@+id/image4"android:layout_width="500px"android:layout_height="500px"android:background="@android:color/holo_orange_light" /></LinearLayout>

import android.graphics.Bitmap
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Matrix
import android.graphics.RectF
import android.os.Bundle
import android.widget.ImageView
import androidx.appcompat.app.AppCompatActivity
import com.bumptech.glide.Glide
import com.bumptech.glide.load.DataSource
import com.bumptech.glide.load.engine.GlideException
import com.bumptech.glide.request.RequestListener
import com.bumptech.glide.request.target.Targetclass MainActivity : AppCompatActivity() {companion object {const val TAG = "fly"const val SIZE = 500}override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)val image1 = findViewById<ImageView>(R.id.image1)val image2 = findViewById<ImageView>(R.id.image2)val image3 = findViewById<ImageView>(R.id.image3)val image4 = findViewById<ImageView>(R.id.image4)Glide.with(this).load(R.mipmap.pic).fitCenter().override(SIZE).into(image1)Glide.with(this).load(R.mipmap.pic).centerCrop().override(SIZE).into(image2)Glide.with(this).asBitmap().load(R.mipmap.pic).fitCenter().addListener(object : RequestListener<Bitmap> {override fun onLoadFailed(e: GlideException?, model: Any?, target: Target<Bitmap>, isFirstResource: Boolean): Boolean {return false}override fun onResourceReady(resource: Bitmap,model: Any,target: Target<Bitmap>?,dataSource: DataSource,isFirstResource: Boolean): Boolean {val bmp = transformToCenterCrop(resource)image4.setImageBitmap(bmp)return false}}).override(SIZE).into(image3)}fun transformToCenterCrop(bitmap: Bitmap): Bitmap {val w = bitmap.widthval h = bitmap.heightval bmp = Bitmap.createBitmap(SIZE, SIZE, Bitmap.Config.ARGB_8888)val c = Canvas(bmp)c.drawColor(Color.LTGRAY)val mini = Math.min(w, h)val left = (w - mini) / 2fval top = (h - mini) / 2fval right = (w + mini) / 2fval bottom = (h + mini) / 2fval srcRectF = RectF(left, top, right, bottom)val dstRectF = RectF(0f, 0f, SIZE.toFloat(), SIZE.toFloat())val mx = Matrix()mx.setRectToRect(srcRectF, dstRectF, Matrix.ScaleToFit.CENTER)c.drawBitmap(bitmap, mx, null)return bmp}
}

转换为centerCrop耗时约1ms。

Android矩阵Matrix裁切setRectToRect拉伸Bitmap替代Bitmap.createScaledBitmap缩放，Kotlin-CSDN博客文章浏览阅读1.2k次，点赞7次，收藏14次。Android拼接合并图片生成长图代码实现合并两张图片，以第一张图片的宽度为标准，如果被合并的第二张图片宽度和第一张不同，那么就以第一张图片的宽度为准线，对第二张图片进行缩放。Android拼接合并图片生成长图代码实现合并两张图片，以第一张图片的宽度为标准，如果被合并的第二张图片宽度和第一张不同，那么就以第一张图片的宽度为准线，对第二张图片进行缩放。基础上，把剪切的区域从矩形Rect变为圆形的Path，当手指在上面的ImageView移动时候，下面同等大小对应的坐标区域显示“剪切”出来的圆形图。_createscaledbitmaphttps://blog.csdn.net/zhangphil/article/details/135961734