问题描述:
Android沉浸式开发时,为了让用户专注于内容,避免背景图片的干扰,需要把背景内容模糊掉。 实现效果如下:
使用示例:
Bitmap img = BlurBuilder.blur(this, BitmapFactory.decodeResource(getResources(), R.mipmap.bbg), 3f, 25f); // 模糊值取值 0 < blur <= 25f
高斯模糊源代码:
为了加速渲染的速度,使用硬件渲染脚本进行高斯模糊,注意模糊值的范围为:(0~25]
package org.tcshare.utils; import android.content.Context; import android.graphics.Bitmap; import android.renderscript.Allocation; import android.renderscript.Element; import android.renderscript.RenderScript; import android.renderscript.ScriptIntrinsicBlur; /** * 模糊图片by yuxiaohei */ public class BlurBuilder { public static Bitmap blur(Context context, Bitmap image, float scale, float radius) { int width = Math.round(image.getWidth() * scale); int height = Math.round(image.getHeight() * scale); Bitmap inputBitmap = Bitmap.createScaledBitmap(image, width, height, false); Bitmap outputBitmap = Bitmap.createBitmap(inputBitmap); RenderScript rs = RenderScript.create(context); ScriptIntrinsicBlur theIntrinsic = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs)); Allocation tmpIn = Allocation.createFromBitmap(rs, inputBitmap); Allocation tmpOut = Allocation.createFromBitmap(rs, outputBitmap); theIntrinsic.setRadius(radius); theIntrinsic.setInput(tmpIn); theIntrinsic.forEach(tmpOut); tmpOut.copyTo(outputBitmap); return outputBitmap; } }
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