Android viewpager+ScrollView 高度冲突问题

第一种

public class MyViewPager extends ViewPager {
    public MyViewPager(@NonNull Context context) {
        super(context);
    }


    public MyViewPager(@NonNull Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int height = 0;
        for (int i = 0; i < getChildCount(); i++) {
            View child = getChildAt(i);
            child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
            int h = child.getMeasuredHeight();
            if (h > height)
                height = h;
        }

        heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
}      

弊端：每个viewpager高度一样，导致有的画面会有大空白

第二种

public class CustomViewpager extends ViewPager {

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

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

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int viewHeight = 0;
        View childView = getChildAt(getCurrentItem());
        if (childView != null) {
            childView.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
            viewHeight = childView.getMeasuredHeight();
            heightMeasureSpec = MeasureSpec.makeMeasureSpec(viewHeight, MeasureSpec.EXACTLY);
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
}
      

在viewpager中

viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

    }

    @Override
    public void onPageSelected(int position) {
        selectionViewPager(position);
        View view = viewPager.getChildAt(position);
        int height = view.getMeasuredHeight();
        LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) viewPager.getLayoutParams();
        layoutParams.height = height;
        viewPager.setLayoutParams(layoutParams);
    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }
});