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我希望在活動中有3個選項卡，每個選項卡由片段（分別爲1,2 & 3）在每個片段中具有RecyclerView組成。在三個選項卡中的任意一個上單擊RecyclerView的列表項時，我想用相同選項卡下的另一片段（片段4）替換相應的片段，同時保留後退按鈕的操作以返回到原始片段。我怎樣才能實現這個？動態更改TabLayout內部的片段
我對在MainActivity XML是：
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="fixed"
app:tabGravity="fill"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
我的MainActivity代碼是：
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
private int[] tabIcons = {
R.drawable.ic_tab_favourite,
R.drawable.ic_tab_call,
R.drawable.ic_tab_contacts
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
/*getSupportActionBar().hide();*/
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
/*setupTabIcons();*/
}
/*private void setupTabIcons() throws NullPointerException{
tabLayout.getTabAt(0).setIcon(tabIcons[0]);
tabLayout.getTabAt(1).setIcon(tabIcons[1]);
tabLayout.getTabAt(2).setIcon(tabIcons[2]);
}*/
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new OneFragment(), "Events");
adapter.addFragment(new TwoFragment(), "Schedule");
adapter.addFragment(new ThreeFragment(), "Register");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
我OneFragment代碼：
（看看recyclerView.addOnItemTouchListener）
public class OneFragment extends android.support.v4.app.Fragment
{
public TextView name;
public ImageView imgViewIcon;
public CardView cardView;
public OneFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View root = inflater.inflate(R.layout.fragment_one, container, false);
RecyclerView recyclerView = (RecyclerView) root.findViewById(R.id.recyclerView);
final List<ItemData> nitemsData = new ArrayList<ItemData>();
nitemsData.add(new ItemData("Literature",R.mipmap.ic_launcher));
nitemsData.add(new ItemData("Art",R.mipmap.ic_launcher));
nitemsData.add(new ItemData("Music", R.mipmap.ic_launcher));
nitemsData.add(new ItemData("Theatre",R.mipmap.ic_launcher));
nitemsData.add(new ItemData("Dance",R.mipmap.ic_launcher));
nitemsData.add(new ItemData("Udbhav Cup",R.mipmap.ic_launcher));
nitemsData.add(new ItemData("Misc", R.mipmap.ic_launcher));
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
MyAdapter mAdapter = new MyAdapter(nitemsData);
recyclerView.setAdapter(mAdapter);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.addOnItemTouchListener(
new RecyclerItemClickListener(getActivity(), new RecyclerItemClickListener.OnItemClickListener() {
@Override public void onItemClick(View view, int position) {
//How to replace OneFragment with another fragment, say FourFragment, under the same tab?
//Also, hitting the back button should take me back to OneFragment
}
})
);
return root;
}
public void item_remove(List<ItemData> nitemsData,String att){
Iterator<ItemData> itr = nitemsData.iterator();
while (itr.hasNext()) {
ItemData nitem = itr.next();
if (nitem.getTitle().equals(att))
{
itr.remove();
}
}
}
}
我的OneFragment XML是：
<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"
tools:context="com.msrit.abhilash.udbhavtake1.OneFragment">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ONE"
android:visibility="gone"
android:textSize="40dp"
android:textStyle="bold"
android:layout_centerInParent="true"/>
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".OneFragment"
android:clipToPadding="false"
/>
</RelativeLayout>
TwoFragment和ThreeFragment具有非常相似的結構和代碼。