this is for generating square images which always takes width form parent and sets height equal to width

MySquareImage java class

public class MySquareImages extends android.support.v7.widget.AppCompatImageView {
    public MySquareImages(Context context) {
        super(context);
    }

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

    public MySquareImages(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int width = getMeasuredWidth();
        setMeasuredDimension(width, width);
    }
}

MySquareImage xml file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">
<com.example.dsdatsme.instaclone.Utils.MySquareImages
    android:src="@drawable/img5"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:scaleType="centerCrop"
    android:layout_weight="1"/>
    <com.example.dsdatsme.instaclone.Utils.MySquareImages
        android:src="@drawable/img5"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:scaleType="centerCrop" 
        android:layout_weight="1"/>
    <com.example.dsdatsme.instaclone.Utils.MySquareImages
    android:src="@drawable/img5"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:scaleType="centerCrop" 
        android:layout_weight="1"/>

</LinearLayout>