[챕터 2-4-2] 프래그먼트 2

결과화면

두번째 이미지 버튼 클릭 시 

세번째 이미지 버튼 클릭 시 

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res/drawable/

이미지 파일 격납

 

dream01.png

0.08MB

dream02.png

0.02MB

dream03.png

0.20MB

 

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파일명 : fragment_list.xml

 

 

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자바 클래스 생성 

 

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클래스명 : ListFragment

슈퍼클래스 : androidx.fragment.app.Fragment

 

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컨트럴 + O : 오버라이드

 

onCreateView() 선택

onAttach() 선택

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ListFragment.java

 

package org.minokuma.myfragment2;

import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

public class ListFragment extends Fragment {

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
    }

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

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

            }
        });

        Button button2 = rootView.findViewById(R.id.button2);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });

        Button button3 = rootView.findViewById(R.id.button3);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });
        
        return rootView;
    }
}

 

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파일명 : fragment_viewer

 

 

 

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파일명 : ViewerFragment

슈퍼클래스 : androidx.fragment.app.Fragment

 

package org.minokuma.myfragment2;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

public class ViewerFragment extends Fragment {
    ImageView imageView;

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

        imageView = rootView.findViewById(R.id.imageView);

        return rootView;
    }

    public void setImage(int resid){
        imageView.setImageResource(resid);
    }

}

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ListFragment.java

 

package org.minokuma.myfragment2;

import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

public class ListFragment extends Fragment {

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
    }

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

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

            }
        });

        Button button2 = rootView.findViewById(R.id.button2);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });

        Button button3 = rootView.findViewById(R.id.button3);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });

        return rootView;
    }
}

 

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인터페이스 생성 : ImageSelectionCallback

 

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ImageSelectionCallback.java

 

package org.minokuma.myfragment2;

public interface ImageSelectionCallback {

    public void onImageSelected(int position);

}

 

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MainActivity.java

package org.minokuma.myfragment2;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity implements ImageSelectionCallback {

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

    @Override
    public void onImageSelected(int position) {
        
    }
}

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프레임 레이아웃 추가 

 

각각 설정

layout_height : 0dp

layout_weight : 1

 

 

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activity_main.xml

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">
        <fragment
            android:id="@+id/listFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:name="org.minokuma.myfragment2.ListFragment"/>
    </FrameLayout>

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">
        <fragment
            android:id="@+id/viewerFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:name="org.minokuma.myfragment2.ViewerFragment" />
    </FrameLayout>
</LinearLayout>

 

 

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MainActivity.java

 

package org.minokuma.myfragment2;

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

import android.os.Bundle;

public class MainActivity extends AppCompatActivity implements ImageSelectionCallback {

    ListFragment listFragment;
    ViewerFragment viewerFragment;

    int[] images = {R.drawable.dream01, R.drawable.dream02, R.drawable.dream03};

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

        FragmentManager fragmentManager = getSupportFragmentManager();
        listFragment = (ListFragment) fragmentManager.findFragmentById(R.id.listFragment);
        viewerFragment = (ViewerFragment) fragmentManager.findFragmentById(R.id.viewerFragment);
    }

    @Override
    public void onImageSelected(int position) {
        viewerFragment.setImage(images[position]);
    }
}

 

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ListFragment.java

 

package org.minokuma.myfragment2;

import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

public class ListFragment extends Fragment {

    ImageSelectionCallback imageSelectionCallback;

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);

        if(context instanceof ImageSelectionCallback){
            imageSelectionCallback = (ImageSelectionCallback) context;
        }
    }

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

        Button button = rootView.findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (imageSelectionCallback != null){
                    imageSelectionCallback.onImageSelected(0);
                }
            }
        });

        Button button2 = rootView.findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (imageSelectionCallback != null){
                    imageSelectionCallback.onImageSelected(1);
                }
            }
        });

        Button button3 = rootView.findViewById(R.id.button3);
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (imageSelectionCallback != null){
                    imageSelectionCallback.onImageSelected(2);
                }
            }
        });

        return rootView;
    }
}