[Do it! 안드로이드 앱] 자바) 버튼으로 프래그먼트 교체하기

둘째 마당 05 프래그먼트 이해하기_01

 

실행화면

 

디자인

 

프로젝트 설명

[메뉴 화면으로] 버튼을 누르면 메뉴 프래그먼트로 [메인 화면으로] 버튼을 누르면 메인 프래그먼트로 이동한다

※ 메뉴 프래그먼트의 바탕색은 주황색이다

 

activity_main.xml

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

    <fragment
        android:id="@+id/mainFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:name="com.sample.samplefragment.MainFragment"/>

</FrameLayout>

MainActivity.java

package com.sample.samplefragment;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {
    MainFragment mainFragment;
    MenuFragment menuFragment;

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

        mainFragment = (MainFragment) getSupportFragmentManager().findFragmentById(R.id.mainFragment);
        menuFragment = new MenuFragment();
    }

    public void onFragmentChanged(int index){
        if (index == 0) {
            getSupportFragmentManager().beginTransaction().replace(R.id.container,
                    menuFragment).commit();
        } else if (index == 1){
            getSupportFragmentManager().beginTransaction().replace(R.id.container,
                    mainFragment).commit();
        }
    }
}

Fragment_main.xml

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

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="50dp"
        android:text="메인 프레그먼트"/>

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="메뉴 화면으로"
        android:textSize="20dp"/>

</LinearLayout>

MainFragment.java

package com.sample.samplefragment;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

public class MainFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_main,
                container, false);

        Button button = rootView.findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                MainActivity activity = (MainActivity) getActivity();
                activity.onFragmentChanged(0);
            }
        });
        return rootView;
    }
    }

Fragment_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MenuFragment"
    android:orientation="vertical"
    android:background="@android:color/holo_orange_light">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="50dp"
        android:text="메뉴 프레그먼트"/>

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="메인 화면으로"
        android:textSize="20dp"/>

</LinearLayout>

MenuFragment.java

package com.sample.samplefragment;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

public class MenuFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_menu,
                container, false);

        MainActivity activity = (MainActivity) getActivity();

        Button button2 = rootView.findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                activity.onFragmentChanged(1);
            }
        });
        return rootView;
    }
}