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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();
}
}
}