https://stackoverflow.com/questions/23678513
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RussianYou must create a fragment with a custom layout that contains a ViewPager on it.
Follow these steps, it will guide in the entire process.
1. Create the layout to represent the ViewPager, name it fragment_main.xml
<TabHost
android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TabWidget
android:id="@android:id/tabs"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0"/>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_weight="0"/>
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
</LinearLayout>
</TabHost>
2. Create a fragment to hold the ViewPager declared on the XML above, name it MyFragment.java
As you can see, we declare the TabHost the ViewPager and other elements declared in the XML above. Also in this fragment we inflate the layout created before, and a TabAdapter to handle all the tabs.
import android.content.Context;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TabHost;
import android.widget.TabWidget;
import java.util.ArrayList;
public static class MyFragment extends Fragment
{
private TabHost mTabHost;
private ViewPager mViewPager;
private TabsAdapter mTabsAdapter;
public MyFragment() {
}
@Override
public void onCreate(Bundle instance)
{
super.onCreate(instance);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_main, container, false);
mTabHost = (TabHost) v.findViewById(android.R.id.tabhost);
mTabHost.setup();
mViewPager = (ViewPager) v.findViewById(R.id.pager);
mTabsAdapter = new TabsAdapter(getActivity(), mTabHost, mViewPager);
// Here we load the content for each tab.
mTabsAdapter.addTab(mTabHost.newTabSpec("one").setIndicator("One"), PageOneFragment.class, null);
mTabsAdapter.addTab(mTabHost.newTabSpec("two").setIndicator("Two"), PageTwoFragment.class, null);
return v;
}
public static class TabsAdapter extends FragmentPagerAdapter implements TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener
{
private final Context mContext;
private final TabHost mTabHost;
private final ViewPager mViewPager;
private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
static final class TabInfo
{
private final String tag;
private final Class<?> clss;
private final Bundle args;
TabInfo(String _tag, Class<?> _class, Bundle _args)
{
tag = _tag;
clss = _class;
args = _args;
}
}
static class DummyTabFactory implements TabHost.TabContentFactory
{
private final Context mContext;
public DummyTabFactory(Context context)
{
mContext = context;
}
public View createTabContent(String tag)
{
View v = new View(mContext);
v.setMinimumWidth(0);
v.setMinimumHeight(0);
return v;
}
}
public TabsAdapter(FragmentActivity activity, TabHost tabHost, ViewPager pager)
{
super(activity.getSupportFragmentManager());
mContext = activity;
mTabHost = tabHost;
mViewPager = pager;
mTabHost.setOnTabChangedListener(this);
mViewPager.setAdapter(this);
mViewPager.setOnPageChangeListener(this);
}
public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args)
{
tabSpec.setContent(new DummyTabFactory(mContext));
String tag = tabSpec.getTag();
TabInfo info = new TabInfo(tag, clss, args);
mTabs.add(info);
mTabHost.addTab(tabSpec);
notifyDataSetChanged();
}
@Override
public int getCount()
{
return mTabs.size();
}
@Override
public Fragment getItem(int position)
{
TabInfo info = mTabs.get(position);
return Fragment.instantiate(mContext, info.clss.getName(), info.args);
}
public void onTabChanged(String tabId)
{
int position = mTabHost.getCurrentTab();
mViewPager.setCurrentItem(position);
}
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels)
{
}
public void onPageSelected(int position)
{
// Unfortunately when TabHost changes the current tab, it kindly
// also takes care of putting focus on it when not in touch mode.
// The jerk.
// This hack tries to prevent this from pulling focus out of our
// ViewPager.
TabWidget widget = mTabHost.getTabWidget();
int oldFocusability = widget.getDescendantFocusability();
widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
mTabHost.setCurrentTab(position);
widget.setDescendantFocusability(oldFocusability);
}
public void onPageScrollStateChanged(int state)
{
}
}
}
As you can see, each tab calls a specific fragment. These fragments represent the content for each tab. So let's create them, they are very simple, and contains only a TextView.
3. Create a fragment for the first tab content, name it PageOneFragment.java
This fragment will hold the content of the first tab. You can put anything inside this fragment, it will live separated from the other fragments and from the other tabs.
Here we inflate the xml layout pageone_fragment.xml inside the onCreateView method. We will create this xml layout in the next step.
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class PageOneFragment extends Fragment
{
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
return inflater.inflate(R.layout.pageone_fragment, container, false);
}
@Override
public void onActivityCreated(Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
}
@Override
public void onAttach(Activity activity)
{
super.onAttach(activity);
}
@Override
public void onStart()
{
super.onStart();
}
@Override
public void onResume()
{
super.onResume();
}
}
We must create the layout for this fragment as we mentioned before.
4. Create the layout for the PageOneFragment, name it pageone_fragment.xml
This is just a simple layout with a TextView to represent the content of the tab. You can build anything you want inside this layout, it will live separated from the other fragments and tabs.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/first_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
android:background="#ff4063ff">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="First Page"
android:textColor="#FFFFFF"
android:textStyle="bold"
android:id="@+id/firstFragmentTextView"
android:layout_gravity="center_horizontal|top" />
</LinearLayout>
As we have two tabs, we have two fragments, one for each tab. So let's create the second fragment for the second tab content.
5. Create the fragment for the second tab content, name it PageTwoFragment.java
As you can see, we inflate a different layout on the onCreateView method, it's called pagetwo_fragment.xml. We will create it on the next step.
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class PageTwoFragment extends Fragment
{
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
return inflater.inflate(R.layout.pagetwo_fragment, container, false);
}
@Override
public void onActivityCreated(Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
}
@Override
public void onAttach(Activity activity)
{
super.onAttach(activity);
}
@Override
public void onStart()
{
super.onStart();
}
@Override
public void onResume()
{
super.onResume();
}
}
And as we did before for the PageOneFragment, let's create the layout for the second fragment too, as we mentioned before.
6. Create the layout for the PageTwoFragment, name it pagetwo_fragment.xml
This is a simple layout with a single TextView, just to represent the content. You can build anything you want in here, it will live separated from the other fragments and tabs.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/first_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
android:background="#ff4063ff">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Second Page"
android:textColor="#FFFFFF"
android:textStyle="bold"
android:id="@+id/firstFragmentTextView"
android:layout_gravity="center_horizontal|top" />
</LinearLayout>
7. Call this fragment from your NavigationDrawer
If you want to call this fragment from your NavigationDrawer, inside the switch statement on your activity's displayView(int position) method, you should do this in one of your case statements, for example.
case 0:
fragment = new MyFragment();
break;
Here is the final result
A ViewPager running on a fragment, with two tabs each contains a unique fragment with a unique content.
That's it.
Hope this helps you.
