android 使用randerScript实现图片模糊效果

1.build.gradle 配置：

android {    defaultConfig {        renderscriptTargetApi 19        renderscriptSupportModeEnabled true    }}

2.使用如下代码:

public class BlurBuilder {    private static final float BITMAP_SCALE = 0.2f;    private static final float BLUR_RADIUS = 15f;    public static Bitmap blur(Context context, 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(context);        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;    }}

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