阶段一冲刺九

昨天任务

开始学习底部导航栏的制作

学习了fragment控件的基本用法

今天任务

学习fragment两种创建的生命周期

 

 

学习对fragment进行增删改查的增用法

package com.example.belowmeue;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import android.os.Bundle;

import com.example.belowmeue.fragment.DongtaiFragment;

public class DFragmentActivity extends AppCompatActivity {

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

        //防止fragmentManager被重复创建
        if(savedInstanceState == null){
            FragmentManager fragmentManager = getSupportFragmentManager();
            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.add(R.id.fcv, DongtaiFragment.class,null)
                    .setReorderingAllowed(true)  //允许自动排序
                    .addToBackStack(null)  //创建之后添加到栈里
                    .commit()
            ;
        }

    }
}