Blur bitmap

import android.content.Context; import android.graphics.Bitmap; import android.renderscript.Allocation; import android.renderscript.Element; import android.renderscript.RenderScript; import android.renderscript.ScriptIntrinsicBlur; public class BlurBuilder { private static final float BITMAP_SCALE = 0.4f; private static final float BLUR_RADIUS = 7.5f; 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; } } // defaultConfig { // applicationId "com.example.phamngoctuan.thinghiem" // minSdkVersion 17 // targetSdkVersion 23 // versionCode 1 // versionName "1.0" // renderscriptTargetApi 17 // renderscriptSupportModeEnabled true // }