[안드로이드 스튜디오] Fragement 활용하기

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Fragment 활용하기

과제일시 : 2020-05-27 

Fragment를 활용하여, 각버튼을 누르면 배경색을 변경할 수 있는 앱을 만들어보았습니다. 보기엔 간단하여 보이지만 생각보다 많은 시간과 이해가 필요했습니다.

 

[실행화면]

 

[소스 코드]

* activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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">

    <FrameLayout
        android:id="@+id/frameLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </FrameLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="550dp"
        android:orientation="horizontal"
        app:layout_constraintTop_toTopOf="parent">

        <Button
            android:id="@+id/btn_fragmentA"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="clickHandler"
            android:text="A" />

        <Button
            android:id="@+id/btn_fragmentB"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="clickHandler"
            android:text="B" />

        <Button
            android:id="@+id/btn_fragmentC"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="clickHandler"
            android:text="C" />

    </LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

* fragment_a.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:background="#FF0000">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textSize="50dp"
        android:text="Fragment A" />
</LinearLayout>

* fragment_b.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:background="#0000FF">


    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textSize="50dp"
        android:text="Fragment B" />
</LinearLayout>

* fragment_c.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:background="#00FF00">

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textSize="50dp"
        android:text="Fragment C" />

</LinearLayout>

* AFragment.java
package com.example.fragment02;

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

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

public class AFragment extends Fragment {

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_a, container, false);
    }
}


* BFragment.java
package com.example.fragment02;

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

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

public class BFragment extends Fragment {

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_b, container, false);
    }
}

* CFragment.java
package com.example.fragment02;

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

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

public class CFragment extends Fragment {

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_c, container, false);
    }
}

* MainActivity.java
package com.example.fragment02;

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;

public class MainActivity extends AppCompatActivity {

    private FragmentManager fragmentManager;
    private AFragment fragmentA;
    private BFragment fragmentB;
    private CFragment fragmentC;
    private FragmentTransaction transaction;

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

        fragmentManager = getSupportFragmentManager();

        fragmentA = new AFragment();
        fragmentB = new BFragment();
        fragmentC = new CFragment();

        transaction = fragmentManager.beginTransaction();
        transaction.replace(R.id.frameLayout, fragmentA).commitAllowingStateLoss();
    }

    public void clickHandler(View view){
        transaction = fragmentManager.beginTransaction();

        switch (view.getId()){
            case R.id.btn_fragmentA:
                transaction.replace(R.id.frameLayout, fragmentA).commitAllowingStateLoss();
                break;
            case R.id.btn_fragmentB:
                transaction.replace(R.id.frameLayout, fragmentB).commitAllowingStateLoss();
                break;
            case R.id.btn_fragmentC:
                transaction.replace(R.id.frameLayout, fragmentC).commitAllowingStateLoss();
        }
    }
}

다들 열공입니다 !