[英]ViewPager does not show anything
我的TabLayout和ViewPager出了點問題。 它什么也沒顯示。 這是我的適配器:
public class PagerAdapter extends FragmentStatePagerAdapter {
int mNumOfTabs;
public PagerAdapter(FragmentManager fm, int mNumOfTabs) {
super(fm);
this.mNumOfTabs = mNumOfTabs;
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return ChoiceFragment.newInstance("Mobile Games",
R.drawable.ic_stay_current_portrait_white_48dp, "1");
case 1:
return ChoiceFragment.newInstance("Computer Games",
R.drawable.ic_payment_white_48dp, "5");
default: return ChoiceFragment.newInstance("Mobile Games",
R.drawable.ic_stay_current_portrait_white_48dp, "1");
}
}
@Override
public int getCount() {
return mNumOfTabs;
}
@Override
public CharSequence getPageTitle(int position) {
String title;
if (position == 0)
title = "Mobile";
else
title = "Computer";
return title;
}
這是我的TabFragment類:
public class TabGroupFragment extends Fragment {
public TabGroupFragment() {
// Required empty public constructor
}
public static TabGroupFragment newInstance() {
TabGroupFragment fragment = new TabGroupFragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_tab_group, container, false);
TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setText("Mobile"));
tabLayout.addTab(tabLayout.newTab().setText("Computer"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
final ViewPager viewPager = (ViewPager) view.findViewById(R.id.view_pager);
final PagerAdapter adapter = new PagerAdapter(
getActivity().getSupportFragmentManager(),
tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(
new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
return view;
}
}
這是上述類的布局:
FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".TabGroupFragment">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/utility_white"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
android:id="@+id/tab_layout" />
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/view_pager"/>
</LinearLayout>
</ScrollView>
我在這里沒有發現任何錯誤。 我只是按照教程學習。 讓我知道這里發生了什么。 謝謝
謝謝@MikeM。 現在一切正常。 我刪除了TabLayout
和ViewPager
周圍的LinearLayout
,並將FrameLayout
更改為RelativeLayout
,它們都出現了。 謝謝!
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".TabGroupFragment">
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/utility_white"
android:elevation="6dp"
android:id="@+id/tab_layout" />
<android.support.v4.view.ViewPager
android:layout_below="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/view_pager"/>
</RelativeLayout>
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