添加图像工具类。

app/src/main/java/com/coldmint/rust/pro/tool/ImageUtil.kt

@@ -0,0 +1,82 @@
+package com.coldmint.rust.pro.tool
+
+import android.graphics.Bitmap
+import android.graphics.Canvas
+import android.graphics.PixelFormat
+import android.graphics.drawable.Drawable
+import androidx.palette.graphics.Palette
+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.Target
+import com.coldmint.rust.core.web.ServerConfiguration
+
+/**
+ * 图像工具
+ */
+object ImageUtil {
+
+    /**
+     * Drawable转Bitmap
+     */
+    fun drawableToBitmap(drawable: Drawable): Bitmap {
+        //声明将要创建的bitmap
+        var bitmap: Bitmap? = null;
+        //获取图片宽度
+        val width = drawable.getIntrinsicWidth();
+        //获取图片高度
+        val height = drawable.getIntrinsicHeight();
+        //图片位深，PixelFormat.OPAQUE代表没有透明度，RGB_565就是没有透明度的位深，否则就用ARGB_8888。详细见下面图片编码知识。
+        val config: Bitmap.Config = if (drawable.getOpacity() != PixelFormat.OPAQUE) {
+            Bitmap.Config.ARGB_8888
+        } else {
+            Bitmap.Config.RGB_565
+        }
+        //创建一个空的Bitmap
+        bitmap = Bitmap.createBitmap(width, height, config)
+        //在bitmap上创建一个画布
+        val canvas = Canvas(bitmap)
+        //设置画布的范围
+        drawable.setBounds(0, 0, width, height);
+        //将drawable绘制在canvas上
+        drawable.draw(canvas);
+        return bitmap;
+    }
+
+
+    /**
+     * 设置请求回调
+     */
+    fun getRequestListener(func: (Palette?) -> Unit): RequestListener<Drawable> {
+        return object :
+            RequestListener<Drawable> {
+            override fun onLoadFailed(
+                e: GlideException?,
+                model: Any?,
+                target: Target<Drawable>?,
+                isFirstResource: Boolean
+            ): Boolean {
+                return false
+            }
+
+            override fun onResourceReady(
+                resource: Drawable?,
+                model: Any?,
+                target: Target<Drawable>?,
+                dataSource: DataSource?,
+                isFirstResource: Boolean
+            ): Boolean {
+                if (resource == null) {
+                    return false
+                }
+                var bitmap = drawableToBitmap(resource)
+                Palette.from(bitmap).generate {
+                    func(it)
+                }
+                return false
+            }
+
+        }
+    }
+
+}