ViewPager 标题在我滑动之前不会出现 [英] ViewPager Title doesn't appear until I swipe it

问题描述

我正在学习使用 ViewPager 和 PagerTabStrip 来实现导航栏.我已经实现了，我的问题是:每次打开应用新鲜，标题不显示，但我刷一次后，标题又出现，然后一切正常.代码如下:

定制适配器

公共类 MyPagerAdapter 扩展 PagerAdapter {私人列表<查看>视图列表；私有列表<字符串>标题列表；public MyPagerAdapter(List<View>viewList, List<String>titleList){this.viewList = 视图列表；this.titleList = 标题列表；}@覆盖公共 int getCount() {返回 viewList.size();}@覆盖public boolean isViewFromObject(View view, Object o) {返回视图 == o;}@覆盖公共对象实例化项(ViewGroup 容器，int 位置){container.addView(viewList.get(position));返回 viewList.get(位置);}@覆盖public void destroyItem(ViewGroup container, int position, Object object) {container.removeView(viewList.get(position));}@覆盖公共 CharSequence getPageTitle(int position) {返回titleList.get(位置)；}}

.xml 文件:

这是在我刷到第二页之后:
我真的很沮丧.谢谢！！
解决方案
com.android.support:appcompat-v7:23.0.0出现问题.你可以参考这里 https://code.google.com/p/android/issues/detail?id=183127
在该链接中，谷歌支持团队提到该缺陷将在未来的版本中修复.所以现在的解决方案是使用 com.android.support:appcompat-v7:22.2.1 构建项目
更新:如果对您可行，那么您可以继续使用@nidheeshdas 提供的另一种解决方案.我尝试过简单的项目；它工作Activity的onResume()里面@nidheeshdas的修改解决方案
viewPager.setCurrentItem(1);viewPager.postDelayed(new Runnable() {@覆盖公共无效运行(){viewPager.setCurrentItem(0);}},100);
新更新: 正如上面提到的谷歌问题跟踪链接和来自 JP Ventura 的评论.我已尝试使用新版本的库，问题似乎已解决.
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:

Customised Adapter
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 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>
This is the screenshot of "Just clicked the app icon":


And this is after I swiped to the second page:


I'm really frustrated. Thanks!!
解决方案
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

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

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);
New Update: As mentioned in the above google issue tracker link and comments from  JP Ventura. I have tried with new version of library and issue seems to be fixed.

                        
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