Question

I have a LinearLayout (holder), which has match_parent for both width and height. In this holder I insert a View (a Class extending View). I do this inside the onCreate method of the Activity.

My question is, how do I make this child View stretch maximum horizontally and vertically, keeping a square shape, to fill as much area as possible from the parent LinearLayout?

Here’s what I use right now as a starting point:

    pieContainer = (LinearLayout) findViewById(R.id.pie_container_id);
    pie = new PieView(this);
    pieContainer.addView(pie);

I have tried playing around with overwriting the onMeasure method on both sides (the main activity and the PieView class), but to no avail.

Answer 1

Try this custom SquareView

public class SquareView extends View {
  public SquareView(Context context) {
    super(context);
  }

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

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

  public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    int size = Math.min(getMeasuredWidth(), getMeasuredHeight());
    setMeasuredDimension(size, size);
  }
}