Dynamic height viewpager

Question

I\'m trying to create a custom viewpager inside custom scroll viewthat dynamically wraps the current child\'s height.

package com.example.vihaan.dynamicviewp         


        

Answer 1

This few lines of code will solve the problem.

Create a custome widget for viewpager class. and in xml use it for viewpager.

public class DynamicHeightViewPager extends ViewPager {
private View mCurrentView;

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

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

@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    if (mCurrentView != null) {
        mCurrentView.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));

        int height = Math.max(0, mCurrentView.getMeasuredHeight());
        heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
}

public void measureCurrentView(View currentView) {
    mCurrentView = currentView;
    requestLayout();
}
}

Then in the view pager adapter override the below method and add the code.

  @Override
public void setPrimaryItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
    super.setPrimaryItem(container, position, object);
    if (container instanceof DynamicHeightViewPager) {
// instead of card view give your root view from your item.xml file.
        CardView cardView = (CardView) object;
        ((DynamicHeightViewPager) container).measureCurrentView(cardView);
    }
}

Make your view pager height wrap_content inside xml file so you can check the result.