Saturday, August 29, 2015

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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