在ImageView的背景模糊

问题描述

我想在ImageView的模糊背景。

我有这个，但一切都模糊了，无论是图像和背景：

  ...
    imageView.setImageBitmap（bitmapWithoutBlur）;    位图bitmapBlur =模糊（getApplicationContext（），bitmapWithoutBlur）;    BitmapDrawable bitmapDrawable =新BitmapDrawable（getResources（），bitmapBlur）;    imageView.setBackgroundDrawable（bitmapDrawable）;    ...    公共静态位图模糊（上下文的背景下，位图位图）{
            INT宽度= Math.round（bitmap.getWidth（））;
            INT高度= Math.round（bitmap.getHeight（））;            位图inputBitmap = Bitmap.createScaledBitmap（位图，宽度，高度，假）;
            位图outputBitmap = Bitmap.createBitmap（inputBitmap）;            RenderScript RS = RenderScript.create（背景）;
            ScriptIntrinsicBlur theIntrinsic = ScriptIntrinsicBlur.create（RS，Element.U8_4（RS））;
            分配tmpIn = Allocation.createFromBitmap（RS，inputBitmap）;
            分配tmpOut = Allocation.createFromBitmap（RS，outputBitmap）;
            theIntrinsic.setRadius（25F）;
            theIntrinsic.setInput（tmpIn）;
            theIntrinsic.forEach（tmpOut）;
            tmpOut.copyTo（outputBitmap）;            返回outputBitmap;
    }
 

解决方案

从RenderScript使用库来ScriptIntrinsicBlur模糊quickly.Follow这如何访问RenderScript API的.以下是我做了模糊意见和位图类：

 公共类BlurBuilder {
    私有静态最终浮动BITMAP_SCALE = 0.4f;
    私有静态最终浮动BLUR_RADIUS = 7.5f;    公共静态位图模糊（视图v）{
        返回模糊（v.getContext（），getScreenshot（ⅴ））;
    }    公共静态位图模糊（上下文CTX，位图图像）{
        INT宽度= Math.round（image.getWidth（）* BITMAP_SCALE）;
        INT高度= Math.round（image.getHeight（）* BITMAP_SCALE）;        位图inputBitmap = Bitmap.createScaledBitmap（图像，宽度，高度，假）;
        位图outputBitmap = Bitmap.createBitmap（inputBitmap）;        RenderScript RS = RenderScript.create（CTX）;
        ScriptIntrinsicBlur theIntrinsic = ScriptIntrinsicBlur.create（RS，Element.U8_4（RS））;
        分配tmpIn = Allocation.createFromBitmap（RS，inputBitmap）;
        分配tmpOut = Allocation.createFromBitmap（RS，outputBitmap）;
        theIntrinsic.setRadius（BLUR_RADIUS）;
        theIntrinsic.setInput（tmpIn）;
        theIntrinsic.forEach（tmpOut）;
        tmpOut.copyTo（outputBitmap）;        返回outputBitmap;
    }    私有静态位图getScreenshot（视图v）{
        位图B = Bitmap.createBitmap（v.getWidth（），v.getHeight（），Bitmap.Config.ARGB_8888）;
        帆布C =新的Canvas（B）;
        v.draw（C）;
        返回b;
    }
}
 

I would like to have blurred background in ImageView.

I have this, but everything is blurred, both image and the background:

    ...
    imageView.setImageBitmap(bitmapWithoutBlur);

    Bitmap bitmapBlur = blur(getApplicationContext(), bitmapWithoutBlur);

    BitmapDrawable bitmapDrawable = new BitmapDrawable(getResources(), bitmapBlur);

    imageView.setBackgroundDrawable(bitmapDrawable);

    ...

    public static Bitmap blur(Context context, Bitmap bitmap) {
            int width = Math.round(bitmap.getWidth());
            int height = Math.round(bitmap.getHeight());

            Bitmap inputBitmap = Bitmap.createScaledBitmap(bitmap, 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(25f);
            theIntrinsic.setInput(tmpIn);
            theIntrinsic.forEach(tmpOut);
            tmpOut.copyTo(outputBitmap);

            return outputBitmap;
    }

解决方案

Use ScriptIntrinsicBlur from the RenderScript library to blur quickly.Follow this to how to access the RenderScript API http://developer.android.com/guide/topics/renderscript/compute.html#access-rs-apis. The following is a class I made to blur Views and Bitmaps:

public class BlurBuilder {
    private static final float BITMAP_SCALE = 0.4f;
    private static final float BLUR_RADIUS = 7.5f;

    public static Bitmap blur(View v) {
        return blur(v.getContext(), getScreenshot(v));
    }

    public static Bitmap blur(Context ctx, Bitmap image) {
        int width = Math.round(image.getWidth() * BITMAP_SCALE);
        int height = Math.round(image.getHeight() * BITMAP_SCALE);

        Bitmap inputBitmap = Bitmap.createScaledBitmap(image, width, height, false);
        Bitmap outputBitmap = Bitmap.createBitmap(inputBitmap);

        RenderScript rs = RenderScript.create(ctx);
        ScriptIntrinsicBlur theIntrinsic = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
        Allocation tmpIn = Allocation.createFromBitmap(rs, inputBitmap);
        Allocation tmpOut = Allocation.createFromBitmap(rs, outputBitmap);
        theIntrinsic.setRadius(BLUR_RADIUS);
        theIntrinsic.setInput(tmpIn);
        theIntrinsic.forEach(tmpOut);
        tmpOut.copyTo(outputBitmap);

        return outputBitmap;
    }

    private static Bitmap getScreenshot(View v) {
        Bitmap b = Bitmap.createBitmap(v.getWidth(), v.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas c = new Canvas(b);
        v.draw(c);
        return b;
    }
}

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