Question

我在一个活动中有2个Tab片段。活动在中心有一个圆形图像视图。当我刷第一片时，我需要显示第一张图片＆amp;与第二个标签滑动相同，不同的图像。

更新

 static class ViewPagerAdapter extends FragmentPagerAdapter {
        public ViewPagerAdapter(FragmentManager manager) {
            super(manager);
        }
  @Override
    public Fragment getItem(int position) {
        Fragment fragment = null;
        Bundle bundle = new Bundle();
        bundle.putInt("position", position);
        switch (position) {
            case 0:
                imgProfile.setImageResource(R.drawable.login_logo);
                return new LogInFragment();

            case 1:
                imgProfile.setImageResource(R.drawable.add_image);
                return new SignUpFragment();
        }
        return null;
    }

    @Override
    public int getCount() {
        return 2;
    }

    @Override
    public CharSequence getPageTitle(int position) {

        switch (position) {
            case 0:

                return "LOGIN";
            case 1:

                return "SIGNUP";
        }
        return null;
    }
}

Answer 1

var margin: CGFloat {
  return 10.0
}
var width: CGFloat {
  return 100 - margin
}

Answer 2

好的，我现在明白你想做什么：首先删除更改图像的所有代码，然后尝试：

static class ViewPagerAdapter extends FragmentPagerAdapter {
        public ViewPagerAdapter(FragmentManager manager) {
            super(manager);
        }

        @Override
        public Fragment getItem(int position) {
            Fragment fragment = null;
            Bundle bundle = new Bundle();
            switch (position) {
                case 0:
                    yourImageView.setImageResource(R.id.yourResource1);
                    fragment = new LogInFragment();
                    break;
                case 1:
                    yourImageView.setImageResource(R.id.yourResource2);
                    fragment = new SignUpFragment();
                    break;
            }
            return fragment;
        }

        @Override
        public int getCount() {
            return 2;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            String str = "";
            switch (position) {
                case 0:
                    str = "LOGIN";
                    break;
                case 1:
                    str = "SIGNUP"; 
                    break;
            }
            return str;
        }
    }

这就是你所需要的一切

Answer 3

最后通过使用以下代码在@sasikumar回答中进行了一些修改。

我没有把 onPageScrollStateChanged 放在 onPageSelected

上。

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

    @Override
    public void onPageSelected(int position) {
        int i = 0;
        if (position == 0) {
            Log.e("Tab Position", String.valueOf(position));
            imgProfile.setImageResource(R.drawable.login_logo);
        } else if (position == 1) {
            Log.e("Tab Position", String.valueOf(position));
            imgProfile.setImageResource(R.drawable.add_image);
        }
    }

    @Override
    public void onPageScrollStateChanged(int state) {
    }
});

更改ImageView取决于Tab

3 个答案: