How resize base64 ImageView using java android?

i am trying to resize an ImageView in which i use a base64 encoded image using only java but i am getting errors. Does anyone know of a way?

My code:

import android.content.Context;
import android.graphics.BitmapFactory;
import android.util.Base64;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.LinearLayout.LayoutParams;

public class kd {
    public static void Show(final Context context) {
        
        ImageView iv_image = new ImageView(context);
         
        String base64_img = "my base64 image code here";

        byte[] imageAsBytes = Base64.decode(base64_img.getBytes(), 0);

        LayoutParams params = (LayoutParams) iv_image.getLayoutParams();
        
        params.width = 50;
        params.height = 50;

        iv_image.setLayoutParams(params);
        
        iv_image.setImageBitmap(BitmapFactory.decodeByteArray(imageAsBytes, 0, imageAsBytes.length));

        }      
}

error log:

FATAL EXCEPTION: main
    
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.my.package/com.my.package.MainActivity}: java.lang.NullPointerException: Attempt to write to field 'int android.view.ViewGroup$LayoutParams.width' on a null object reference
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3562)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3723)
    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2166)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:236)
    at android.app.ActivityThread.main(ActivityThread.java:7821)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:621)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:997)
    Caused by: java.lang.NullPointerException: Attempt to write to field 'int android.view.ViewGroup$LayoutParams.width' on a null object reference
    at com.my.package.kd.Show(kd.java:94)
    at com.my.package.MainActivity.onCreate(MainActivity.java:14)
    at android.app.Activity.performCreate(Activity.java:8012)
    at android.app.Activity.performCreate(Activity.java:7996)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1311)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3535)

I tried several ways to change the size, but I always receive some error, I would be grateful if someone can give me a hand.