ViewPager标题没有出现，直到我刷卡它 [英] ViewPager Title doesn't appear until I swipe it

问题描述

我学习使用ViewPager和PagerTabStrip实现导航栏。我已经实现了，我的问题是：我每次打开应用程序清新，标题不显示，但经过我刷了一次，标题都再次出现，然后一切正常。 如下图所示code：

I am learning to use ViewPager and PagerTabStrip to implement navigation bar. I have implemented it, my problem is: every time I open the app fresh, the titles don't show, but after I swipe it once, the titles all appear again, and then everything is normal. code shown below:

专项适配器

public class MyPagerAdapter extends PagerAdapter {
    private List<View> viewList;
    private List<String> titleList;

    public MyPagerAdapter(List<View> viewList, List<String> titleList){
        this.viewList = viewList;
        this.titleList = titleList;
    }

    @Override
    public int getCount() {
        return viewList.size();
    }

    @Override
    public boolean isViewFromObject(View view, Object o) {
        return view == o;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        container.addView(viewList.get(position));
        return viewList.get(position);
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView(viewList.get(position));
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return titleList.get(position);
    }
}

.xml文件：

.xml File:

<android.support.v4.view.ViewPager
    android:id="@+id/viewPager"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center">

    <android.support.v4.view.PagerTabStrip
        android:id="@+id/tab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        />

</android.support.v4.view.ViewPager>

这是只要点击应用程序图标的截图：

This is the screenshot of "Just clicked the app icon":

这是我以后刷到第二页：

And this is after I swiped to the second page:

我真的很沮丧。谢谢！

推荐答案

这是一个问题出现在com.android.support:appcompat-v7:23.0.0 。在这里你可以参考的https：//$c$c.google .COM / P /安卓/问题/详细信息？ID = 183127

It is an issue appeared in com.android.support:appcompat-v7:23.0.0. You can refer here https://code.google.com/p/android/issues/detail?id=183127

在该链接谷歌的支持团队必须提到的缺陷将被固定在未来的版本。 所以现在的解决方案是使用生成项目com.android.support:appcompat-v7:22.2.1

In that link google support team have mention that defect would be fixed in future releases. So for now solution is build the project using com.android.support:appcompat-v7:22.2.1

更新：如果可行的你，那么你可以与@nidheeshdas提供另一种解决方案继续前进。我曾尝试简单的项目;它的工作 @nidheeshdas内活动的onResume（）修改的方案

Update : If feasible for you then you can go ahead with another solution provided by @nidheeshdas. I have tried on simple project; it work Modified solution of @nidheeshdas inside onResume() of Activity

viewPager.setCurrentItem(1);
    viewPager.postDelayed(new Runnable() {
        @Override
        public void run() {
            viewPager.setCurrentItem(0);
        }
    },100);

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