标签文本随viewpager消失
问题描述:
一个非常简单的例子。我认为大多数人以这种方式实施一个标签。但标签文本只是丢失。标签文本随viewpager消失
设计支持lib的版本是最新的24.2.0。
这里是我的布局代码:
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
app:tabTextColor="@android:color/darker_gray"
app:tabSelectedTextColor="@android:color/white"
android:background="@color/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.widget.TabItem
android:text="@string/tab_domain"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<android.support.design.widget.TabItem
android:text="@string/tab_upload"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<android.support.design.widget.TabItem
android:text="@string/tab_download"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.TabLayout>
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
我使用ButterKnife 8.2.1绑定视图对象。这里是的onCreate(我的活动代码):
final DiagnosePagerAdapter adapter = new DiagnosePagerAdapter(getSupportFragmentManager(),
tabs.getTabCount());
tabs.setupWithViewPager(pager);
pager.setAdapter(adapter);
pager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabs));
,这里是我的适配器:
class DiagnosePagerAdapter extends FragmentStatePagerAdapter {
int mNumOfTabs;
List<Fragment> fragments = new ArrayList<>();
public DiagnosePagerAdapter(FragmentManager fm, int numberOfTabs) {
super(fm);
this.mNumOfTabs = numberOfTabs;
fragments.add(new DomainFragment());
fragments.add(new UploadFragment());
fragments.add(new DownloadFragment());
}
@Override
public Fragment getItem(int position) {
return fragments.get(position);
}
@Override
public int getCount() {
return mNumOfTabs;
}
}
我已经看到了类似的问题在这里:Using TabLayout inside a Fragment; tab text invisible
在回答这个问题说这已被固定在23.0.0,并且我的手机中没有任何解决方法可行,包括小米HM 2A和华为设备。
答
您必须如下覆盖getPageTitle()
(我认为这将解决您的问题):
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Domain";
case 1:
return "Upload";
case 2:
return "Download";
}
return null;
}
此外,如你有固定的标签的数量,你应该使用FragmentPagerAdapter
而不是FragmentStatePagerAdapter
。然后如下修改XML布局:
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
app:tabTextColor="@android:color/darker_gray"
app:tabSelectedTextColor="@android:color/white"
android:background="@color/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
更改适配器如下:
class DiagnosePagerAdapter extends FragmentPagerAdapter {
public DiagnosePagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
Fragment fragment = null;
switch (position) {
case 0:
fragment = new DomainFragment();
break;
case 1:
fragment = new UploadFragment();
break;
case 2:
fragment = new DownloadFragment();
break;
}
return fragment;
}
@Override
public int getCount() {
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Domain";
case 1:
return "Upload";
case 2:
return "Download";
}
return null;
}
}
并如下更改onCreate()
:
final DiagnosePagerAdapter adapter = new DiagnosePagerAdapter(getSupportFragmentManager());
pager.setAdapter(adapter);//call setAdapter() before setupWithViewPager()
tabs.setupWithViewPager(pager);
这工作!非常感谢:) – Bleaker
@Bleaker:很高兴知道它解决了你的问题。请点击回答旁边的绿色勾号接受答案。 –