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  • How to blur background image using BitMap?

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     In the below example code I have created blur background image function. In activity_main.xml layout I have added a Button and ImageView.

    Now see programming area, here I have used Bitmap class. When a user clicks on button background image will get blur easily without any delay in time.
     See below code I have Completely described "to blur background image with using BitMap".


    Step(1)-activity_main.xml-

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
    
        android:id="@+id/relative"
        tools:context="com.example.androidimageview.MainActivity">
    
    
            <Button
                android:id="@+id/btn"
                android:text="Click"
                android:gravity="center"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        
        <ImageView
    
            android:id="@+id/image"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"/>
    
    </RelativeLayout>

     

    Step(2)-MainActivity-

    public class MainActivity extends ActionBarActivity  {
        ImageView imageView;
        Button button;
        Bitmap bitmapOriginal;
        View view;
    
        RelativeLayout relativeLayout;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            imageView=(ImageView)findViewById(R.id.image);
            button=(Button)findViewById(R.id.btn);
            relativeLayout=(RelativeLayout)findViewById(R.id.relative);
            bitmapOriginal= BitmapFactory.decodeResource(getResources(),R.drawable.img);
       
            imageView.setBackground(getDrawable(R.drawable.one));
    
    
            button.setOnClickListener(new Button.OnClickListener() {
                @Override
                public void onClick(View v) {
    
                   BitmapDrawable ob = new BitmapDrawable(getResources(), blur(bitmapOriginal));
                    imageView.setBackground(ob);
                    imageView.setImageDrawable(ob);
              }
          });
    
    
        }
         //image effect
         private static final float BITMAP_SCALE = 0.4f;
        private static final float BLUR_RADIUS = 7.5f;
    
        public Bitmap blur(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);
    
           //using RenderScript class
            RenderScript rs = RenderScript.create(this);
            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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