How to make a dynamic layout that is larger than screen?

Question

I want to create a dynamically extending layout that may grow reflecting to user\'s input. First, I\'ve created an activity layout that allows scrolling in both directions

Answer 1

The solution is surprisingly simple.

In the activity layout, a RelativeLayout node (the one with content ID) should use the custom layout class that overrides the onMeasure method.

So here is the fix for the activity layout:

<com.sample.MyRelativeLayout
    android:id="@+id/content"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:clipChildren="false"
    android:clipToPadding="false" >
</com.sample.MyRelativeLayout>

and here is the class implementation:

public class MyRelativeLayout extends RelativeLayout {
    public MyRelativeLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(0, 0);
    }
}

Note that I don't have to calculate anything, passing (0, 0) works just fine.

Frankly speaking, I don't yet understand all pros and cons of this solution, but it works properly. The only issue that I have noticed so far is that the more items I expand, the slower the UI responds.

I'll appreciate any comments or suggestions.