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Android Glide transform圆形图CircleCrop动态代码描边绘制外框线并rotateImage旋转，Kotlin

news 2025/8/8 10:14:10

Android Glide transform圆形图CircleCrop动态代码描边绘制外框线并rotateImage旋转，Kotlin

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"android:layout_width="match_parent"android:layout_height="match_parent"><ImageViewandroid:id="@+id/image"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center"android:padding="2px"android:background="@drawable/ic_launcher_background"android:src="@drawable/ic_launcher_foreground" /></FrameLayout>

注意，要用padding而不是margin，padding的值2px和kotlin代码里面的描边线宽度stroke一直。

import android.graphics.Bitmap
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Paint
import android.os.Bundle
import android.widget.ImageView
import androidx.appcompat.app.AppCompatActivity
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool
import com.bumptech.glide.load.resource.bitmap.CenterCrop
import com.bumptech.glide.load.resource.bitmap.CircleCrop
import com.bumptech.glide.load.resource.bitmap.TransformationUtilsclass MainActivity : AppCompatActivity() {companion object {const val SIZE = 200const val STROKE_WIDTH = 2F //描边宽度为2px}override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)val image = findViewById<ImageView>(R.id.image)GlideApp.with(this).load(R.mipmap.pic4).transform(CenterCrop(), MyCircleCrop()).error(android.R.drawable.stat_notify_error).override(SIZE).into(image)}class MyCircleCrop : CircleCrop() {override fun transform(pool: BitmapPool,toTransform: Bitmap,outWidth: Int,outHeight: Int): Bitmap {val bmp = TransformationUtils.circleCrop(pool, toTransform, outWidth, outHeight)val p = Paint()p.isAntiAlias = truep.style = Paint.Style.STROKE //描边p.color = Color.REDp.strokeWidth = STROKE_WIDTHval cv = Canvas(bmp)cv.drawCircle((outWidth / 2).toFloat(),(outHeight / 2).toFloat(),//半径取宽和高最小的。同时减去描边占掉的宽度，否则会把边画到外面。minOf(outWidth, outHeight) / 2 - STROKE_WIDTH,p)return TransformationUtils.rotateImage(bmp, -90) //逆时针旋转90度。}}
}

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