安卓家庭记账本开发笔记7（补2月3日）

完成收支记录界面的逻辑编写

代码如下：

package com.example.myapplication1;

import android.os.Bundle;
import android.view.View;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.viewpager2.widget.ViewPager2;
import com.example.myapplication1.adapter.RecordPagerAdapter;
import com.example.myapplication1.frag_record.IncomeFragment;
import com.example.myapplication1.frag_record.BaseRecordFragment;
import com.example.myapplication1.frag_record.OutcomeFragment;
import com.google.android.material.tabs.TabLayout;
import com.google.android.material.tabs.TabLayoutMediator;
import java.util.ArrayList;
import java.util.List;

public class RecordActivity extends AppCompatActivity {
    TabLayout tabLayout;
    ViewPager2 viewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_record);
        tabLayout = findViewById(R.id.record_tabs);
        viewPager = findViewById(R.id.record_vp);
        initPager();

        View button = findViewById(R.id.record_iv_back);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });

    }

    private void initPager() {
        List<Fragment> fragmentList = new ArrayList<>();
        OutcomeFragment outFrag = new OutcomeFragment();
        IncomeFragment inFrag = new IncomeFragment();
        fragmentList.add(outFrag);
        fragmentList.add(inFrag);

        RecordPagerAdapter pagerAdapter = new RecordPagerAdapter(this, fragmentList);

        viewPager.setAdapter(pagerAdapter);

        new TabLayoutMediator(tabLayout, viewPager,
                (tab, position) -> tab.setText(pagerAdapter.getPageTitle(position).toString())
        ).attach();
    }
    
}
相关适配器文件recordpageradapter
代码如下：

package com.example.myapplication1.adapter;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import com.example.myapplication1.RecordActivity;

import java.util.List;

public class RecordPagerAdapter extends FragmentStateAdapter {
    List<Fragment> fragmentList;
    String[] titles = {"支出", "收入"};

    public RecordPagerAdapter(@NonNull RecordActivity fragment, List<Fragment> fragmentList) {
        super(fragment);
        this.fragmentList = fragmentList;
    }

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

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

    public String getPageTitle(int position) {
        return titles[position];
    }
}
接着在主界面的代码上面加上点击“记一笔”跳转到收支界面的点击事件代码