tabLayoutのタブを追加できません

Question

tabLayoutに新しいタブを追加できません。

XMLファイル

<RelativeLayout 
android:id="@+id/main_layout" 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context="com.dailam103.messagetimer.MainActivity"> 
<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.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/pager" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" > 
</android.support.v4.view.ViewPager> 
</RelativeLayout> 

MainActivity.java

package com.dailam103.messagetimer; 
import android.os.Bundle; 
import android.support.v4.view.ViewPager; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.support.design.widget.TabLayout; 
public class MainActivity extends AppCompatActivity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs); 
    tabLayout.addTab(tabLayout.newTab().setTag(1).setText("Tab 1")); 
    final ViewPager viewPager = (ViewPager) findViewById(R.id.pager); 
    final TabAdapter adapter = new TabAdapter(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) { 
     } 
    }); 

} 
} 

エラーが

tabLayout.addTab（tabLayout.newTab（）である。setTag（1）.setText（「タブ1 "）））;

tabLayoutにタブを追加できない理由を教えてください。

Answer 1

このように長くコードする必要はありません。

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) { 
     } 
    }); 

ただ、どこからでもtablayoutを設定するために有用であろうtabLayout.setupWithViewPager(viewPager);

• またはコードを追加します。

  public class ViewPagerBean { 
  ViewPager viewPager; 
  TabLayout tabLayout; 
  ArrayList<TabBean> tabTitleList; 
  
  
  public ViewPager getViewPager() { 
      return viewPager; 
  } 
  
  public void setViewPager(ViewPager viewPager) { 
      this.viewPager = viewPager; 
  } 
  
  public TabLayout getTabLayout() { 
      return tabLayout; 
  } 
  
  public void setTabLayout(TabLayout tabLayout) { 
      this.tabLayout = tabLayout; 
  } 
  
  public ArrayList<TabBean> getTabTitleList() { 
      return tabTitleList; 
  } 
  
  public void setTabTitleList(ArrayList<TabBean> tabTitleList) { 
      this.tabTitleList = tabTitleList; 
  } 
  } 
  
  public class TabBean { 
  int icon; 
  int title; 
  BaseFragment baseFragment; 
  
  public TabBean(int icon, int title, BaseFragment baseFragment) { 
  this.icon = icon; 
  this.title = title; 
  this.baseFragment = baseFragment; 
  } 
  
  public int getIcon() { 
  return icon; 
  } 
  
  public void setIcon(int icon) { 
  this.icon = icon; 
  } 
  
  public int getTitle() { 
  return title; 
  } 
  
  public void setTitle(int title) { 
  this.title = title; 
  } 
  
  public BaseFragment getBaseFragment() { 
  return baseFragment; 
  } 
  
  public void setBaseFragment(BaseFragment baseFragment) { 
  this.baseFragment = baseFragment; 
  } 
  } 
  

• 私のすべてのフラグメントはBaseFragmentになります。あなたはBaseFragmentをあなたのBaseActivityクラスに置き換えて、活動中のtablayoutが必要な場合にだけ置き換えてください。

  private TabLayout tabLayout; 
  private ViewPager viewPagerImage; 
  
  tabLayout = (TabLayout) fragmentView.findViewById(R.id.tabLayoutDefault); 
  viewPagerImage = (ViewPager) fragmentView.findViewById(R.id.homeViewPager); 
  

• このコードをBaseFragmentまたはBaseActivityクラスに書き込みます。

  public void setViewPager(ViewPagerBean viewPagerBean) { 
  ViewPager viewPager = viewPagerBean.getViewPager(); 
  TabLayout tabLayout = viewPagerBean.getTabLayout(); 
  FragmentManager fragmentManager = getFragmentManager(); 
  PagerAdapter adapterMyEvents = new PagerAdapter(fragmentManager, 
  viewPagerBean.getTabTitleList()); 
  viewPager.setAdapter(adapterMyEvents); 
  tabLayout.setupWithViewPager(viewPager); 
  viewPager.setCurrentItem(0); 
  setCustomTabView(viewPagerBean); 
  } 
  
  private void setCustomTabView(ViewPagerBean pagerBean) { 
  for (int i = 0; i < pagerBean.getTabLayout().getTabCount(); i++) { 
  TabLayout.Tab tab = pagerBean.getTabLayout().getTabAt(i); 
  LinearLayout linearLayout = (LinearLayout) LayoutInflater.from(getActivity()).inflate(R.layout.tab_custom_layout, pagerBean.getTabLayout(), false); 
  TextView tabTextView = (TextView) linearLayout.findViewById(R.id.tab_title); 
  ImageView ivTabLeftIcon = (ImageView) linearLayout.findViewById(R.id.ivTabLeftIcon); 
  TabBean tabBean = pagerBean.getTabTitleList().get(i); 
  
  if (tabBean.getTitle() != 0) 
      tabTextView.setText(tabBean.getTitle()); 
  if (tabBean.getIcon() != 0) 
      ivTabLeftIcon.setImageResource(tabBean.getIcon()); 
  if (tab != null) { 
      tab.setCustomView(linearLayout); 
  } 
  } 
  } 
  
  
  
  
  private class PagerAdapter extends FragmentStatePagerAdapter { 
  
  private ArrayList<TabBean> arrayList; 
  
  public PagerAdapter(FragmentManager fm, ArrayList<TabBean> mTitles) { 
  super(fm); 
  this.arrayList = mTitles; 
  } 
  
  @Override 
  public Fragment getItem(int position) { 
  return arrayList.get(position).getBaseFragment(); 
  } 
  
  
  @Override 
  public CharSequence getPageTitle(int position) { 
  return getString(arrayList.get(position).getTitle()); 
  } 
  
  
  @Override 
  public int getCount() { 
  return arrayList.size(); 
  } 
  } 
  

• と簡単にこのよう

   public ArrayList<TabBean> getUserHomeTabFragmentList() { 
       ArrayList<TabBean> arrayList = new ArrayList<>(); 
  
       FragmentHomeLunchList fragmentMenuLunch = new FragmentHomeLunchList(); 
       FragmentHomeDinnerList fragmentMenuDinner = new 
       FragmentHomeDinnerList(); 
  
       arrayList.add(new TabBean(R.drawable.ic_lunch, R.string.lunch, fragmentMenuLunch)); 
       arrayList.add(new TabBean(R.drawable.ic_dinner, R.string.dinner, fragmentMenuDinner)); 
  
       return arrayList; 
       } 
  
       private void setPagerAdapterWithTabLayout() { 
       ArrayList<TabBean> tabsList = UtilProject.getInstance().getList(); 
       ViewPagerBean viewPagerBean = new ViewPagerBean(); 
       viewPagerBean.setTabLayout(tabLayout); 
       viewPagerBean.setTabTitleList(tabsList); 
       viewPagerBean.setViewPager(viewPagerBottom); 
       setViewPager(viewPagerBean); 
       viewPagerBottom.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { 
       @Override 
       public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { 
  
       } 
  
       @Override 
       public void onPageSelected(int position) { 
  
       } 
  
       @Override 
       public void onPageScrollStateChanged(int state) { 
  
       } 
       }); 
       }