How to set ImageView width and height programmatically in Android

android-imageview-set-width-and-height

//-------------INside OnCreate Method-----------

final ImageView imageView = (ImageView)convertView.findViewById(R.id.imageview_cover_art);

// 4
int newHeight = 200; // New height in pixelsint newWidth = 200; // New width in pixels
        /*            requestLayout()                Call this when something has changed which has                invalidated the layout of this view.        */imageView.requestLayout();

        /*            getLayoutParams()                Get the LayoutParams associated with this view.        */
// Apply the new height for ImageView programmaticallyimageView.getLayoutParams().height = newHeight;

// Apply the new width for ImageView programmaticallyimageView.getLayoutParams().width = newWidth;

// Set the scale type for ImageView image scalingimageView.setScaleType(ImageView.ScaleType.FIT_XY);
BooksAdapter.DownloadImageWithURLTask downloadTask = new BooksAdapter.DownloadImageWithURLTask(imageView);
downloadTask.execute(book.getImageUrl());

//-------------outside OnCreate Method-----------

private class DownloadImageWithURLTask extends AsyncTask<String, Void, Bitmap> {

    ImageView bmImage;

    public DownloadImageWithURLTask(ImageView bmImage) {
        this.bmImage = bmImage;
    }

    protected Bitmap doInBackground(String... urls) {
        String pathToFile = urls[0];
        Bitmap bitmap = null;
        try {
            InputStream in = new java.net.URL(pathToFile).openStream();
            bitmap = BitmapFactory.decodeStream(in);
        } catch (Exception e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return bitmap;
    }

    protected void onPostExecute(Bitmap result) {
        bmImage.setImageBitmap(result);
    }

}

//---------------------end-----------------

How to set ImageView width and height programmatically in Android

activity_main.xml

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".MainActivity"
    android:background="#c0cfd3"
    >
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Set ImageView New Width, Height"
        />
    <ImageView
        android:id="@+id/iv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/btn"
        android:src="@drawable/animal"
        android:background="#bfbbb1"
        />
</RelativeLayout>

MainActivity.java

package com.cfsuman.me.androidcodesnippets;

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;


public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get the widgets reference from XML layout
        final RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);
        final Button btn = (Button) findViewById(R.id.btn);
        final ImageView iv = (ImageView) findViewById(R.id.iv);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int newHeight = 200; // New height in pixels
                int newWidth = 200; // New width in pixels

                /*
                    requestLayout()
                        Call this when something has changed which has
                        invalidated the layout of this view.
                */
                iv.requestLayout();

                /*
                    getLayoutParams()
                        Get the LayoutParams associated with this view.
                */

                // Apply the new height for ImageView programmatically
                iv.getLayoutParams().height = newHeight;

                // Apply the new width for ImageView programmatically
                iv.getLayoutParams().width = newWidth;

                // Set the scale type for ImageView image scaling
                iv.setScaleType(ImageView.ScaleType.FIT_XY);
            }
        });
    }
}

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