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A class for Blurring Images in android (Worked with Bitmap)
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| package Helpers; | |
| import android.content.Context; | |
| import android.graphics.Bitmap; | |
| import android.graphics.drawable.BitmapDrawable; | |
| import android.renderscript.Allocation; | |
| import android.renderscript.Element; | |
| import android.renderscript.RenderScript; | |
| import android.renderscript.ScriptIntrinsicBlur; | |
| import android.widget.ImageView; | |
| import androidx.annotation.NonNull; | |
| /** | |
| * @author HamidReza-mj <br> | |
| * <p> | |
| * Main Source Link: https://ssaurel.medium.com/create-a-blur-effect-on-android-with-renderscript-aa05dae0bd7d <br> <br> | |
| * <p> | |
| * this class add blur effect to bitmap images | |
| * <p> | |
| * for use this, must be add `renderscriptSupportModeEnabled true` in to build.gradle (app level) in defaultConfig scope | |
| * like this: | |
| * <p> | |
| * defaultConfig {<br> | |
| * ....<br> | |
| * renderscriptSupportModeEnabled true<br> | |
| * } | |
| * <p> | |
| * for set this to image, call setImageBitmap and pass the argument bitmap to this | |
| * | |
| * <p> | |
| * it is better to use in try catch block | |
| */ | |
| public class BlurBuilder { | |
| private static final float BITMAP_SCALE = 0.6f; | |
| /** | |
| * if need raduis > 25, must be call again & againg result bitmap with the blur method | or call this with level {@link #multipleBlur(Context, Bitmap, int)} | |
| */ | |
| private static final float DEFAULT_RADIUS = 25f; | |
| /** | |
| * blur image bit map | |
| * | |
| * @param context | |
| * @param image | |
| * @return Bitmap for set the result blur to ImageView with `imageView.setImageBitmap(resultBitmap)` | |
| */ | |
| public static Bitmap blur(Context context, Bitmap image) { | |
| if (image == null) | |
| return null; | |
| 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 intrinsicBlur = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs)); | |
| Allocation tmpIn = Allocation.createFromBitmap(rs, inputBitmap); | |
| Allocation tmpOut = Allocation.createFromBitmap(rs, outputBitmap); | |
| intrinsicBlur.setRadius(DEFAULT_RADIUS); | |
| intrinsicBlur.setInput(tmpIn); | |
| intrinsicBlur.forEach(tmpOut); | |
| tmpOut.copyTo(outputBitmap); | |
| return outputBitmap; | |
| } | |
| /** | |
| * get Bitmap from ImageView to pass {@link #blur(Context, Bitmap)} | |
| * | |
| * @param image an instance of ImageView or childs | |
| * @return Bitmap | |
| */ | |
| public static Bitmap getBitmapFromImage(@NonNull ImageView image) { | |
| return ((BitmapDrawable) image.getDrawable()).getBitmap(); | |
| } | |
| /** | |
| * set multi level blur to image Bitmap | |
| * | |
| * @param context | |
| * @param imageBitmap | |
| * @param level this determines how many levels should be set filter blurred | |
| * @return | |
| */ | |
| public static Bitmap multipleBlur(Context context, Bitmap imageBitmap, int level) { | |
| for (int i = 0; i < level; i++) | |
| imageBitmap = blur(context, imageBitmap); | |
| return imageBitmap; | |
| } | |
| } |
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