안드로이드 (Fragment)

 [activity_main.xml]
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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/frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
 
    </FrameLayout>
 
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"> /*상단 배치를 하단배치로 바꿈*/
 
        <Button
            android:id="@+id/btn_1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="메뉴1" />
 
        <Button
            android:id="@+id/btn_2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="메뉴2" />
 
        <Button
            android:id="@+id/btn_3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="메뉴3" />
 
        <Button
            android:id="@+id/btn_4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="메뉴4" />
 
 
    </LinearLayout>
 
</RelativeLayout>

---------------------------------------------------------------------------------------------------------------------------------------------------------------------
[fragment1.xml]
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:text="111111"/>
 
</FrameLayout>

[fragment2.xml]
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:text="222222222222"/>
 
</FrameLayout>


[fragment3.xml]
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:text="333333"/>
 
</FrameLayout>

[fragment4.xml]
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:text="4444444"/>
 
</FrameLayout>
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
[MainActivity.java]
package com.example.fragmentexample;
 
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
 
public class MainActivity extends AppCompatActivity {
 
    Button btn1,btn2,btn3,btn4;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        btn1 = (Button)findViewById(R.id.btn_1); /*버튼가져오기*/
        btn2 = (Button)findViewById(R.id.btn_2);
        btn3 = (Button)findViewById(R.id.btn_3);
        btn4 = (Button)findViewById(R.id.btn_4);
 
        btn1.setOnClickListener(new View.OnClickListener() { /*버튼을 클릭했을때*/
            @Override
            public void onClick(View v) {
                FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
                Fragment1 fragment1 = new Fragment1(); /*객체 생성*/
                transaction.replace(R.id.frame, fragment1); /*버튼을 눌렀을때 화면을 fragment1로 교체*/
                transaction.commit(); /*실행*/
            }
        });
 
        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
                Fragment2 fragment2 = new Fragment2();
                transaction.replace(R.id.frame, fragment2);
                transaction.commit();
            }
        });
 
        btn3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
                Fragment3 fragment3 = new Fragment3();
                transaction.replace(R.id.frame, fragment3);
                transaction.commit();
            }
        });
 
        btn4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
                Fragment4 fragment4 = new Fragment4();
                transaction.replace(R.id.frame, fragment4);
                transaction.commit();
            }
        });
 
 
    }
}
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
[Fragment1.java]
package com.example.fragmentexample;
 
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
 
public class Fragment1 extends Fragment {
 
    public Fragment1() {
 
    }
 
 
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { /*[Fragment1이 실행될때*/
        return inflater.inflate(R.layout.fragment1, container, false);
    }
}


[Fragment2.java]
package com.example.fragmentexample;
 
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
 
public class Fragment2 extends Fragment {
 
    public Fragment2() {
 
    }
 
 
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment2, container, false);
    }
}
 
[Fragment3.java]
package com.example.fragmentexample;
 
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
 
public class Fragment3 extends Fragment {
 
    public Fragment3() {
 
    }
 
 
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment3, container, false);
    }
}
 
[Fragment4.java]


package com.example.fragmentexample;
 
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
 
public class Fragment4 extends Fragment {
 
    public Fragment4() {
 
    }
 
 
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment4, container, false);
    }
}