[移动开发]android tab

step1:

    implementation 'com.google.android.material:material:1.1.0'

step2: activity

package com.example.mepositry;


import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager.widget.ViewPager;
import android.os.Bundle;
import com.google.android.material.tabs.TabLayout;
import java.util.ArrayList;
import java.util.List;

public class TabDataActivity extends FragmentActivity {
    List<Fragment> fragmentList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tab);

        List<String> curnewslist = new ArrayList<>();
        curnewslist.add("娱乐");
        curnewslist.add("军事");
        curnewslist.add("财经");
        curnewslist.add("体育");

        fragmentList.add(new EntertainmentFragment());
        fragmentList.add(new MilitaryFragment());
        fragmentList.add(new FinanceFragment());
        fragmentList.add(new SportFragment());

        TabLayout tabLayout = findViewById(R.id.main_tablayout);
        ViewPager viewPager = findViewById(R.id.main_newspager);
        viewPager.setAdapter(new FragmentAdapter(getSupportFragmentManager(), fragmentList, curnewslist));
        tabLayout.setupWithViewPager(viewPager);
    }
}

step3: xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="@+id/maindrawerlayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/main_newspager"
        android:layout_width="match_parent"
        android:layout_below="@+id/main_tablayout"
        android:layout_height="match_parent" />

    <com.google.android.material.tabs.TabLayout
        android:id="@+id/main_tablayout"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        app:tabGravity="fill"
        app:tabIndicatorFullWidth="false"
        app:tabIndicatorHeight="2dp"
        app:tabMode="fixed"
        app:tabBackground="@color/blue"
        app:tabIndicatorColor="@color/orange"
        app:tabSelectedTextColor="@color/red"
        app:tabTextColor="@color/white"
        app:tabPaddingStart="0dp"
        app:tabPaddingEnd="0dp"
        app:tabRippleColor="@android:color/transparent" />


</RelativeLayout>

step4:? adapter

package com.example.mepositry;


import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;

import java.util.List;

public class FragmentAdapter extends FragmentPagerAdapter {

    List<Fragment> fragmentList;
    List<String> newstypeList;

    public FragmentAdapter(@NonNull FragmentManager fm, List<Fragment> fragmentListin, List<String> newstypeListin) {
        super(fm);
        this.fragmentList = fragmentListin;
        this.newstypeList = newstypeListin;
    }

    @NonNull
    @Override
    public Fragment getItem(int position) {
        return fragmentList.get(position);
    }

    @Override
    public int getCount() {
        return fragmentList.size();
    }

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return newstypeList.get(position);
    }
}

step5:? fragment

package com.example.mepositry;


import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

public class EntertainmentFragment extends Fragment {

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_entertainment, container, false);
        return view;
    }
}

end