Android TabLayout

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📜 Android TabLayout

📅 最后修改于: 2020-09-30 00:44:33 🧑 作者: Mango

TabLayout用于实现水平制表符。弃用ActionBar.TabListener(API级别21)后，Android将释放TabLayout。

在设计支持库中引入了TabLayout来实现选项卡。

使用TabLayout类的newTab()方法创建选项卡。 Tab的标题和图标分别通过TabListener接口的setText(int)和setIcon(int)方法设置。使用方法addTab(Tab)将布局的选项卡附加在TabLayout上。

TabLayout tabLayout = (TabLayout)findViewById(R.id.tabLayout);
tabLayout.addTab(tabLayout.newTab().setText("Tab 1"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 2"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 3"));

我们还可以使用Android设计小部件的TabItem将选项卡项添加到TabLayout。

使用ViewPager的TabLayout示例

让我们使用ViewPager和Fragment创建一个TabLayout的示例。

文件：activity.xml

使用TabLayout和ViewPager视图组件创建一个activity.xml文件。

文件：build.gradle

现在在build.gradle文件中提供了TabLayout的依赖库。

implementation 'com.android.support:design:26.1.0'

文件：MainActivity.java

在此文件中，我们实现了ViewPager的两个附加侦听器addOnPageChangeListener(listener)，这些幻灯片使选项卡的不同片段和TabLayout的addOnTabSelectedListener(listener)的幻灯片都可以在选项卡选择中选择当前选项卡。

package tablayout.example.com.tablayout;

import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {
    TabLayout tabLayout;
    ViewPager viewPager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tabLayout=(TabLayout)findViewById(R.id.tabLayout);
        viewPager=(ViewPager)findViewById(R.id.viewPager);

        tabLayout.addTab(tabLayout.newTab().setText("Home"));
        tabLayout.addTab(tabLayout.newTab().setText("Sport"));
        tabLayout.addTab(tabLayout.newTab().setText("Movie"));
        tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

        final MyAdapter adapter = new MyAdapter(this,getSupportFragmentManager(), tabLayout.getTabCount());
        viewPager.setAdapter(adapter);

        viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));

         tabLayout.addOnTabSelectedListener(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) {

            }
        });

    }
}

文件：MyAdapter.java

package tablayout.example.com.tablayout;

import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentManager;

public class MyAdapter extends FragmentPagerAdapter {

    private Context myContext;
    int totalTabs;

    public MyAdapter(Context context, FragmentManager fm, int totalTabs) {
        super(fm);
        myContext = context;
        this.totalTabs = totalTabs;
    }

    // this is for fragment tabs
    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                HomeFragment homeFragment = new HomeFragment();
                return homeFragment;
            case 1:
                SportFragment sportFragment = new SportFragment();
                return sportFragment;
            case 2:
                MovieFragment movieFragment = new MovieFragment();
                return movieFragment;
            default:
                return null;
        }
    }
// this counts total number of tabs
    @Override
    public int getCount() {
        return totalTabs;
    }
}

现在，为所有不同的选项卡创建不同的片段文件。

文件：HomeFragment.java

package tablayout.example.com.tablayout;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class HomeFragment extends Fragment {


    public HomeFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_home, container, false);
    }

}

文件：fragment_home.xml

文件：SportFragment.java

package tablayout.example.com.tablayout;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class SportFragment extends Fragment {


    public SportFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_sport, container, false);
    }

}

文件：fragment_sport.xml

文件：MovieFragment.java

package tablayout.example.com.tablayout;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class MovieFragment extends Fragment {


    public MovieFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_movie, container, false);
    }

}

文件：fragment_movie.xml

文件：strings.xml


    TabLayout

    
    Home Fragment
    Sport Fragment
    Movie Fragment

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