[Do it! 안드로이드 앱] 자바) 프래그먼트 이용하여 이미지뷰어 만들기

둘째 마당 05 프래그먼트 이해하기_02

 

실행화면

디자인

 

프로젝트 설명

[첫 번째 이미지], [두 번째 이미지], [세 번째 이미지] 버튼을 누르면 각각의 이미지로 이미지뷰가 바뀐다

 

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">

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

    <fragment
        android:id="@+id/viewerFragment"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:name="org.techtown.samplefragment.ViewerFragment"/>

</LinearLayout>

MainActivity.java

package org.techtown.samplefragment;

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

import android.os.Bundle;

public class MainActivity extends AppCompatActivity implements ListFragment.ImageSelectionCallback{
    ListFragment listFragment;
    ViewerFragment viewerFragment;

    int[] images = {R.drawable.rm1, R.drawable.rm2, R.drawable.rm3};

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

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

    public void onImageSelected (int position) {
        viewerFragment.setImageView(images[position]);
    }
}

fragment_list.xml

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

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:text="첫 번째 이미지"/>

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

    <Button
        android:id="@+id/button3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:text="세 번째 이미지"/>

</LinearLayout>

ListFragment.java

package org.techtown.samplefragment;

import android.content.Context;
import android.os.Bundle;

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

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

public class ListFragment extends Fragment {

    public static interface ImageSelectionCallback {
        public void onImageSelected(int position);
    }

    public ImageSelectionCallback callback;

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

        if (context instanceof ImageSelectionCallback) {
            callback = (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 button1 = (Button)rootView.findViewById(R.id.button1);
        Button button2 = (Button)rootView.findViewById(R.id.button2);
        Button button3 = (Button)rootView.findViewById(R.id.button3);

        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (callback != null) {
                    callback.onImageSelected(0);
                }
            }
        });

        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (callback != null) {
                    callback.onImageSelected(1);
                }
            }
        });

        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (callback != null) {
                    callback.onImageSelected(2);
                }
            }
        });

        return rootView;
    }
}

fragment_viewer.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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=".ViewerFragment">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/rm1"/>

</FrameLayout>

ViewerFragment.java

package org.techtown.samplefragment;

import android.os.Bundle;

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

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

public class ViewerFragment extends Fragment {
    ImageView imageView;

    @Nullable
    @Override
    public View onCreateView(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 setImageView(int resId) {
        imageView.setImageResource(resId);
    }
}