'fragment'에 해당되는 글 2건

  1. 2020.09.22 Fragment끼리 데이터 전송
  2. 2020.08.17 Fragment

Fragment끼리 데이터 전송

안드로이드 앱 만들기 2020. 9. 22. 22:50

Fragment에선 findViewById가 바로 작동이 안됨 findViewById앞에 view를 붙여야 함

 

------------------------

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"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

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

------------------------

 

 

xml 파일 생성

1. res 폴더 > layout 폴더 우클릭 > File name: fragment_1 >

Root element: androidx.constraintlayout.widget.ConstraintLayout

2. design 탭에서 작업

TextView 생성 > Button 생성

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fragment_1.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">

    <TextView
        android:id="@+id/tv_frag1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="100dp"
        android:text="프래그먼트 1"
        android:textSize="36sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btn_move"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="프래그먼트 2로 이동"
        app:layout_constraintEnd_toEndOf="@+id/tv_frag1"
        app:layout_constraintStart_toStartOf="@+id/tv_frag1"
        app:layout_constraintTop_toBottomOf="@+id/tv_frag1" />
</androidx.constraintlayout.widget.ConstraintLayout>

------------------------

 

 

xml 파일 복사 후 붙여넣기

------------------------

fragment_2.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">

    <TextView
        android:id="@+id/tv_frag2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="100dp"
        android:text="프래그먼트 2"
        android:textSize="36sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btn_move"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="프래그먼트 1로 이동"
        app:layout_constraintEnd_toEndOf="@+id/tv_frag2"
        app:layout_constraintStart_toStartOf="@+id/tv_frag2"
        app:layout_constraintTop_toBottomOf="@+id/tv_frag2" />
</androidx.constraintlayout.widget.ConstraintLayout>

------------------------

 

 

------------------------

MainActivity.java

package com.example.fragmentbundle;

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

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

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

        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        Fragment1 fragment1 = new Fragment1();
        transaction.replace(R.id.framelayout, fragment1);
        transaction.commit(); // 저장
    }
}

------------------------

 

 

java 파일 생성

------------------------

Fragment1.java

package com.example.fragmentbundle;

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

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

public class Fragment1 extends Fragment {

    private View view;
    private TextView tv_frag1;
    private Button btn_move;
    private String result;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.fragment_1, container, false);

        tv_frag1 = view.findViewById(R.id.tv_frag1);
        btn_move = view.findViewById(R.id.btn_move);

        if (getArguments() != null) { // null : 빈 값
            result = getArguments().getString("fromFrag2"); // 프래그먼트 1로 부터 setArguments된 데이터를 받아옴
            tv_frag1.setText(result);
        }

        btn_move.setOnClickListener(new View.OnClickListener() { // 프래그먼트 2로 이동
            @Override
            public void onClick(View view) {
                Bundle bundle = new Bundle(); // 무언가를 담을 준비를 할 수 있는 보따리 or 꾸러미 같은 느낌
                bundle.putString("fromFrag1","khon 프래그먼트 1");
                FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
                Fragment2 fragment2 = new Fragment2();
                fragment2.setArguments(bundle);
                transaction.replace(R.id.framelayout, fragment2);
                transaction.commit(); // 저장
            }
        });

        return view;
    }


}

------------------------

 

 

java 파일 복사 후 붙여넣기

------------------------

Fragment2.java

package com.example.fragmentbundle;

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

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

public class Fragment2 extends Fragment {

    private View view;
    private TextView tv_frag2;
    private Button btn_move;
    private String result;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.fragment_2, container, false);

        tv_frag2 = view.findViewById(R.id.tv_frag2);
        btn_move = view.findViewById(R.id.btn_move);

        if (getArguments() != null) { // null : 빈 값
            result = getArguments().getString("fromFrag1"); // 프래그먼트 1로 부터 setArguments된 데이터를 받아옴
            tv_frag2.setText(result);
        }

        btn_move.setOnClickListener(new View.OnClickListener() { // 프래그먼트 2로 이동
            @Override
            public void onClick(View view) { // 프래그먼트 1로 이동
                Bundle bundle = new Bundle(); // 무언가를 담을 준비를 할 수 있는 보따리 or 꾸러미 같은 느낌
                bundle.putString("fromFrag2","khon 프래그먼트 2");
                FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
                Fragment1 fragment1 = new Fragment1();
                fragment1.setArguments(bundle);
                transaction.replace(R.id.framelayout, fragment1);
                transaction.commit(); // 저장
            }
        });

        return view;
    }


}
저작자표시 (새창열림)

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Posted by khon98
,

Fragment

안드로이드 앱 만들기 2020. 8. 17. 15:42

Fragment는 조각이라는 개념을 써서 한 액티비티에서 조각들을 바꾸는 개념

 

Fragment를 쓸때는 항상 FrameLayout로 조각들을 교체해주는 레이아웃을 사용해야 함

 

------------------------------------------

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">

        <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>

------------------------------------------

 

 

------------------------------------------

fargment1.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="khon1"/>

</FrameLayout>

------------------------------------------

 

 

------------------------------------------

fargment2.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="khon2"/>

</FrameLayout>

------------------------------------------

 

 

------------------------------------------

fargment3.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="khon3"/>

</FrameLayout>

------------------------------------------

 

 

------------------------------------------

fargment4.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="khon4"/>

</FrameLayout>

------------------------------------------

 

------------------------------------------

MainActivity.java

package com.example.fragment;

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

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);
        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() {
            @Override
            public void onClick(View view) {
                FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
                Fragment1 fragment1 = new Fragment1();
                transaction.replace(R.id.frame, fragment1);
                transaction.commit();
            }
        });

        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                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 view) {
                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 view) {
                FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
                Fragment4 fragment4 = new Fragment4();
                transaction.replace(R.id.frame, fragment4);
                transaction.commit();
            }
        });
    }
}

------------------------------------------

 

 

------------------------------------------

Fragment1.java

package com.example.fragment;

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 Fragment1 extends Fragment {

    public Fragment1() {

    }

    @Nullable
    @Override
    // MainActivity에 있는 onCreateView 똑같이 Fragment의 생명주기
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment1,container,false);
    }
}

------------------------------------------

 

 

------------------------------------------

Fragment2.java

package com.example.fragment;

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 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.fragment;

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 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.fragment;

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 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);
    }
}

------------------------------------------

저작자표시 (새창열림)

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Posted by khon98
,

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