Blur the linear layout

here is my complete code:

package com.example.adarsh.test;

import android.app.Service;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.PixelFormat;
import android.graphics.SurfaceTexture;
import android.os.IBinder;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RenderScript;
import android.renderscript.ScriptIntrinsicBlur;
import android.support.annotation.Nullable;
import android.util.Log;
import android.view.Surface;
import android.view.TextureView;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.Toast;

/**
 * Created by Adarsh on 12-08-2016.
 */
public class Exa extends Service {


    WindowManager innerlayout;
    WindowManager.LayoutParams params;
    LinearLayout inner;
    RelativeLayout outer;
    RenderScript mRS;
    ScriptIntrinsicBlur script;
    Allocation allocOriginalScreenshot,allocBlurred;
    TextureView textureViewBlurred;
    private static final String TAG="Exa";

    @Override
    public void onCreate(){
        inner=new LinearLayout(this);
        outer=new RelativeLayout(this);

        //param
        Toast.makeText(Exa.this,"started",Toast.LENGTH_SHORT).show();
        LinearLayout.LayoutParams layoutParams=new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
        inner.setLayoutParams(layoutParams);

        RelativeLayout.LayoutParams rparam=new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
        outer.setLayoutParams(rparam);
        outer.addView(inner);


        innerlayout=(WindowManager)getSystemService(WINDOW_SERVICE);
        params=new WindowManager.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.TYPE_PHONE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, PixelFormat.TRANSPARENT);


        //Ima


        innerlayout.addView(outer,params);
        example();

        blurView(inner);

    }


    private void example() {
        mRS= RenderScript.create(this);
        script= ScriptIntrinsicBlur.create(mRS, Element.RGBA_8888(mRS));
        script.setRadius(5);

    }

    Bitmap getViewScreenshot(View v){
        v.setDrawingCacheEnabled(true);
        Bitmap b=Bitmap.createBitmap(v.getDrawingCache());
        v.setDrawingCacheEnabled(false);

        return b;
    }

    void replaceView(View originalView,View newView){
        originalView.setTag(newView);
        newView.setLayoutParams(new FrameLayout.LayoutParams(originalView.getLayoutParams()));
        ViewGroup parent=(ViewGroup)originalView.getParent();
        int index=parent.indexOfChild(originalView);
        parent.removeView(originalView);
        parent.addView(newView,index);
    }

    void restoreView(View v){
        View otherView=(View)v.getTag();

        if (otherView!=null&&otherView.getParent()!=null){
            replaceView(otherView,v);
        }
        else if (v!=null&&v.getParent()!=null){
            replaceView(v,otherView);
        }
    }

    void blurView(View v){
        Bitmap viewScreenshot=getViewScreenshot(v);

        if(allocOriginalScreenshot!=null&&(allocOriginalScreenshot.getType().getX()!=viewScreenshot.getWidth()||allocOriginalScreenshot.getType().getY()!=viewScreenshot.getHeight())){
            allocOriginalScreenshot.destroy();
            allocBlurred.destroy();

            textureViewBlurred=null;
            allocOriginalScreenshot=null;
            allocBlurred=null;
        }
        if(allocOriginalScreenshot==null){
            allocOriginalScreenshot=Allocation.createFromBitmap(mRS,viewScreenshot);
            allocBlurred=Allocation.createTyped(mRS,allocOriginalScreenshot.getType(),Allocation.USAGE_SCRIPT|Allocation.USAGE_IO_OUTPUT);
            textureViewBlurred=new TextureView(this);
            textureViewBlurred.setOpaque(false);
            textureViewBlurred.setSurfaceTextureListener(surfaceTextureListener);
        }
        else {
            allocOriginalScreenshot.copyFrom(viewScreenshot);
        }
        replaceView(v,textureViewBlurred);
    }

    void unblurView(View v){
        restoreView(v);
    }

    void executeBlur(){
        Log.d(TAG,"Executing blur");
        script.setInput(allocOriginalScreenshot);
        script.forEach(allocBlurred);

        allocBlurred.ioSend();
    }


    TextureView.SurfaceTextureListener surfaceTextureListener=new TextureView.SurfaceTextureListener() {
        @Override
        public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
            allocBlurred.setSurface(new Surface(surface));
            executeBlur();
        }

        @Override
        public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {

        }

        @Override
        public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
            return false;
        }

        @Override
        public void onSurfaceTextureUpdated(SurfaceTexture surface) {

        }
    };




    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}





Output error:
FATAL EXCEPTION: main
 Process: com.example.adarsh.test, PID: 9490
java.lang.RuntimeException: Unable to create service com.example.adarsh.test.Exa: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
 at android.app.ActivityThread.handleCreateService(ActivityThread.java:2801)
 at android.app.ActivityThread.access$1800(ActivityThread.java:155)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1400)
 at android.os.Handler.dispatchMessage(Handler.java:102)
 at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5343)
 at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
at android.graphics.Bitmap.createBitmap(Bitmap.java:640)
at com.example.adarsh.test.Exa.getViewScreenshot(Exa.java:77)
at com.example.adarsh.test.Exa.blurView(Exa.java:104)
at com.example.adarsh.test.Exa.onCreate(Exa.java:63)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:2791)
at android.app.ActivityThread.access$1800(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1400)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)


and when i add the ImageView in innerlayout

it gives me error like this:



FATAL EXCEPTION: main
E/AndroidRuntime: FATAL EXCEPTION: main
                                                                       Process: com.example.adarsh.test, PID: 7418
 java.lang.ClassCastException: android.view.ViewRootImpl cannot be cast to android.view.ViewGroup
                                                                           at com.example.adarsh.test.Exa.replaceView(Exa.java:95)
                                                                           at com.example.adarsh.test.Exa.blurView(Exa.java:133)
                                                                           at com.example.adarsh.test.Exa$1.onClick(Exa.java:70)
                                                                           at android.view.View.performClick(View.java:4785)
                                                                           at android.view.View$PerformClick.run(View.java:19884)
                                                                           at android.os.Handler.handleCallback(Handler.java:739)
                                                                           at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                           at android.os.Looper.loop(Looper.java:135)
                                                                           at android.app.ActivityThread.main(ActivityThread.java:5343)
                                                                           at java.lang.reflect.Method.invoke(Native Method)
                                                                           at java.lang.reflect.Method.invoke(Method.java:372)
                                                                           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
                                                                           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)