How to force GridView to generate square cells in Android

How can I force an android GridView to generate square cells (Cell’s height equal to cell’s width) GridView has 10*9 cells and the app must support multiple screens !

I used a Linear Layout:

row_grid.xml

<LinearLayout 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:padding="0dp" >

        <ImageView
            android:id="@+id/item_image"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="fitXY"
            android:src="@drawable/ic_launcher" >
        </ImageView>

    </LinearLayout>

and GridView: 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:background="@drawable/katy" >

    <GridView
        android:id="@+id/gridView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:horizontalSpacing="0dp"
        android:numColumns="4"
        android:stretchMode="columnWidth"
        android:verticalSpacing="0dp" >
    </GridView>
</RelativeLayout>

Each cell of GridView contains a image that has same width and height. images are larger than cells and must stretch to fit in cells. enter image description here

Answer

First, you’re going to want to create a custom View class that you can use instead of the default LinearLayout you’re using. Then you want to override the View’s onMeasure call, and force it to be square:

public class GridViewItem extends ImageView {

    public GridViewItem(Context context) {
        super(context);
    }

    public GridViewItem(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public GridViewItem(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, widthMeasureSpec); // This is the key that will make the height equivalent to its width
    }
}

Then you can change your row_grid.xml file to:

<path.to.item.GridViewItem xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/item_image"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:scaleType="centerCrop"
    android:src="@drawable/ic_launcher" >
</path.to.item.GridViewItem>

Just be sure to change “path.to.item” to the package where your GridViewItem.java class resides.

I also removed your LinearLayout parent since it wasn’t doing anything for you there.

Edit:

Also changed scaleType from fitXY to centerCrop so that your image doesn’t stretch itself and maintains its aspect ratio. And, as long as it’s a square image, nothing should be cropped, regardless.