一月三十一日 安卓开发十

package com.zhen.accountbook.adapter;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import org.jetbrains.annotations.NotNull;

import java.util.List;

public class RecordPagerAdapter extends FragmentPagerAdapter {
    List<Fragment> fragmentList;
String []titles={"支出","收入"};
    public RecordPagerAdapter(@NonNull @NotNull FragmentManager fm, List<Fragment> fragmentList) {
        super(fm);
        this.fragmentList = fragmentList;
    }

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

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

    @Nullable
    @org.jetbrains.annotations.Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return titles[position];
    }
}

建立收入 和 支出