实现动态切换flagment_02

MainActivity.java

package com.example.flagmentmanagers;

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

import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

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

        Button button1= findViewById(R.id.btn_01);
        button1.setOnClickListener(this);//面向对象原则里面，自动进行类型匹配
        /*平时用button1.setOnClickListener();设置回调函数
        第一种方法直接new产生匿名内部类
        第二种方法implements View.OnClickListener 常用
        */
        Button button2=findViewById(R.id.btn_02);
        button2.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.btn_01:
                replaceFlagment(new BlankFragment1());
                break;
            case R.id.btn_02:
                replaceFlagment(new ItemFragment());
                break;
        }
    }
    //动态切换flagment
    private void replaceFlagment(Fragment fragment) {
        FragmentManager fragmentManager=getSupportFragmentManager();//获取
        FragmentTransaction transaction = fragmentManager.beginTransaction();//开启事务
        transaction.addToBackStack(null);//添加栈实现flagment返回上一步操作
        transaction.replace(R.id.FL_01,fragment);//替换
        transaction.commit();//提交
    }
}
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创建BlankFragment1.java,代码不用改动

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activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">



    

            android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/FL_01"
        android:background="#FF69FF">

---------------------------------------------------------------

创建ItemFragment.java,代码不用改动

实现动态切换flagment_02

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