'안드로이드/Layout'에 해당되는 글 23건

dependencies {

    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'com.google.android.material:material:1.2.1'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'

    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'com.google.android.material:material:1.2.1'
    // ViewPager2
    implementation 'androidx.viewpager2:viewpager2:1.0.0'
    implementation 'gun0912.ted:tedpermission:2.0.0'
} 

    private ViewPager mViewPager;
    private MyViewPagerAdapter myPagerAdapter;
    private TabLayout tabLayout;
 

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        Fragment frag1 = new HomeFragment().newInstance(code,"");
        Fragment frag2 = new WebviewFragment().newInstance(code,"https://m.naver.com");
        Fragment frag3 = new AddressFragment().newInstance(code);

        mViewPager = findViewById(R.id.viewPager);
        tabLayout = findViewById(R.id.tab_layout);
        mViewPager.setOffscreenPageLimit(5);

        myPagerAdapter = new MyViewPagerAdapter(getSupportFragmentManager());
        myPagerAdapter.addFrag(frag1,"Home");
        myPagerAdapter.addFrag(frag2,"공지");
        myPagerAdapter.addFrag(frag3,"지도");

        mViewPager.setAdapter(myPagerAdapter);
        tabLayout.setupWithViewPager(mViewPager);

   }

    private ViewPager2 mViewPager;
    private MyViewPagerAdapter myPagerAdapter;
    private TabLayout tabLayout;

    private String[] titles = new String[]{"리스트", "웹뷰", "연락처"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        Fragment frag1 = new HomeFragment().newInstance(code,"");
        Fragment frag2 = new WebviewFragment().newInstance(code,"https://m.naver.com");
        Fragment frag3 = new AddressFragment().newInstance(code);

        mViewPager = findViewById(R.id.viewPager);
        tabLayout = findViewById(R.id.tab_layout);

        myPagerAdapter = new MyViewPagerAdapter(this);
        myPagerAdapter.addFrag(frag1);
        myPagerAdapter.addFrag(frag2);
        myPagerAdapter.addFrag(frag3);

        mViewPager.setAdapter(myPagerAdapter);

        //displaying tabs
        new TabLayoutMediator(tabLayout, mViewPager, (tab, position) -> tab.setText(titles[position])).attach();
    }
 

public class MyViewPagerAdapter extends FragmentStateAdapter {
    private final List<Fragment> mFragmentList = new ArrayList<>();

    public MyViewPagerAdapter(@NonNull FragmentActivity fragmentActivity) {
        super(fragmentActivity);
    }

    public void addFrag(Fragment fragment) {
        mFragmentList.add(fragment);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {
        // Fragment 교체를 보여주는 처리 구현
        return mFragmentList.get(position);
    }

    @Override
    public int getItemCount() {
        // ViewPager 로 보여줄 View의 전체 개수
        return mFragmentList.size();
    }

}

<?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=".ViewPagerActivity">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/vp_layout"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/tab_layout">

        <androidx.viewpager.widget.ViewPager
            android:id="@+id/viewPager"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

    </androidx.constraintlayout.widget.ConstraintLayout>

    <com.google.android.material.tabs.TabLayout
        android:id="@+id/tab_layout"
        android:layout_width="match_parent"
        android:layout_height="48dp"
        app:tabTextColor="@color/colorDarkGray"
        app:tabSelectedTextColor="@color/colorWhite"
        app:layout_collapseMode="pin"
        app:tabGravity="fill"
        app:tabBackground="@drawable/tab_color_selector"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/vp_layout">

        <com.google.android.material.tabs.TabItem
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Home" />

        <com.google.android.material.tabs.TabItem
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Map" />

        <com.google.android.material.tabs.TabItem
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="공지" />

        <com.google.android.material.tabs.TabItem
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="사랑" />

        <com.google.android.material.tabs.TabItem
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="우정" />

    </com.google.android.material.tabs.TabLayout>

</androidx.constraintlayout.widget.ConstraintLayout> 

<?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"
    android:padding="24dp"
    android:weightSum="6.5">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:orientation="horizontal"
        android:layout_weight="2">

        <View
            android:id="@+id/view1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#FF0000"
            android:layout_weight="1" />

        <View
            android:id="@+id/view2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#0000FF"
            android:layout_weight="1" />

        <View
            android:id="@+id/view3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#00FF00"
            android:layout_weight="1" />
    </LinearLayout>

    <View
        android:id="@+id/view4"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:background="#FFFF00"
        android:layout_weight="1"/>

    <View
        android:id="@+id/view5"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:background="#0000FF"
        android:layout_weight="1"/>

    <View
        android:id="@+id/view6"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:background="#00FF00"
        android:layout_weight="1"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:orientation="vertical"
        android:layout_marginTop="20dp"
        android:layout_weight="1">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
            <Button
                android:id="@+id/button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:text="Button"
                android:textAllCaps="false"/>

            <ImageButton
                android:id="@+id/imageButton"
                android:layout_width="wrap_content"
                android:layout_height="50dp"
                android:layout_gravity="center"
                android:src="@drawable/ic_baseline_videocam_24" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_marginTop="10dp"
            android:layout_marginBottom="5dp">

            <TextView
                android:id="@+id/textView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="20192019"
                android:textSize="32sp"
                android:textColor="#FF0000"/>

            <TextView
                android:id="@+id/textView2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="24dp"
                android:text="홍길동"
                android:textSize="32sp"
                android:textColor="#0000FF"/>
        </LinearLayout>
    </LinearLayout>
</LinearLayout> 

import android.graphics.Color;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Gravity;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class TestActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        LinearLayout myLinearLayout = new LinearLayout(this);
        myLinearLayout.setOrientation(LinearLayout.VERTICAL);

        LinearLayout.LayoutParams mParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT);

        final EditText editText = new EditText(this);
        editText.setHint("여기에 입력하세요");
        mParams.setMargins(0,50,0,10);
        editText.setLayoutParams(mParams);
        myLinearLayout.addView(editText);

        DisplayMetrics dm = getResources().getDisplayMetrics();
        int size = Math.round(20 * dm.density);

        Button btn = new Button(this);
        btn.setText("버튼");
        btn.setBackgroundColor(Color.YELLOW);
        mParams.topMargin = size;
        btn.setLayoutParams(mParams);
        myLinearLayout.addView(btn);

        LinearLayout.LayoutParams tv_params = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT,
                LinearLayout.LayoutParams.WRAP_CONTENT);

        final TextView textView = new TextView(this);
        textView.setText("텍스트뷰입니다.");
        textView.setTextColor(Color.MAGENTA);
        textView.setTextSize(TypedValue.COMPLEX_UNIT_SP,18);
        tv_params.gravity = Gravity.CENTER;
        tv_params.setMargins(0,50,0,0);
        textView.setLayoutParams(tv_params);
        myLinearLayout.addView(textView);

        setContentView(myLinearLayout);

        btn.setOnClickListener(view -> textView.setText(editText.getText().toString()));
    }

}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:id="@+id/parent_layout"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@android:color/transparent"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <androidx.cardview.widget.CardView
        android:id="@+id/parent_card_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/transparent">

        <RelativeLayout
            android:id="@+id/inner_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/transparent">

            <com.google.android.material.textview.MaterialTextView
                android:id="@+id/dialog_title_text"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/default_title_text"
                android:textSize="20sp"
                android:textStyle="bold"
                android:textColor="@android:color/black"
                android:textAlignment="center"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="10dp"
                android:paddingLeft="10dp"
                android:paddingRight="10dp"
                android:paddingTop="5dp"
                android:paddingBottom="2dp"/>

            <com.google.android.material.textview.MaterialTextView
                android:id="@+id/dialog_explain_text"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/dialog_title_text"
                android:text="@string/default_explain_text"
                android:textSize="14sp"
                android:textColor="@android:color/black"
                android:textAlignment="center"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="10dp"
                android:paddingLeft="10dp"
                android:paddingRight="10dp"
                android:paddingTop="2dp"
                android:paddingBottom="5dp"/>

            <com.google.android.material.textfield.TextInputLayout
                android:id="@+id/et_auth_layout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@id/dialog_explain_text"
                android:layout_marginTop="10dp"
                android:layout_marginLeft="20dp"
                android:layout_marginRight="20dp" >

                <com.google.android.material.textfield.TextInputEditText
                    android:id="@+id/et_auth_text"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@color/colorWhite"
                    android:textSize="16sp"
                    android:hint="@string/prompt_auto"
                    android:inputType="numberDecimal"
                    android:imeOptions="actionDone"
                    android:selectAllOnFocus="true">

                </com.google.android.material.textfield.TextInputEditText>

            </com.google.android.material.textfield.TextInputLayout>

            <LinearLayout
                android:id="@+id/btn_layout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="20dp"
                android:layout_below="@id/et_auth_layout"
                android:gravity="top"
                android:orientation="horizontal">

                <com.google.android.material.button.MaterialButton
                    android:id="@+id/btn_disagree"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_marginRight="10dp"
                    android:layout_weight="1"
                    android:backgroundTint="@color/colorOrangeDark"
                    app:cornerRadius="10dp"
                    android:text="취소" />

                <com.google.android.material.button.MaterialButton
                    android:id="@+id/btn_agree"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="10dp"
                    android:layout_weight="1"
                    android:backgroundTint="@color/colorBlue"
                    app:cornerRadius="10dp"
                    android:text="전송" />

            </LinearLayout>
        </RelativeLayout>
    </androidx.cardview.widget.CardView>
</RelativeLayout> 

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:layout_marginTop="10dp"
    android:layout_marginBottom="5dp"
    android:orientation="horizontal">

    <TextView
        android:layout_width="70dp"
        android:layout_height="30dp"
        android:layout_marginTop="5dp"
        android:text="운행일자"
        android:textSize="18sp"
        android:textStyle="bold"
        android:textColor="@color/colorBlack"/>

    <EditText
        android:id="@+id/et_drivingDate"
        android:layout_width="120dp"
        android:layout_height="30dp"
        android:layout_marginTop="5dp"
        android:layout_marginLeft="20dp"
        android:background="#E3E8EA"
        android:gravity="center"
        android:focusable="false"
        android:inputType="date"/>

</LinearLayout> 

public class MainActivity extends AppCompatActivity {
    private final String TAG = this.getClass().getSimpleName();
    Context mContext;

    //Declaring EditText
    private EditText et_drivingDate;
    String drivingDate; // 운행일자
    final Calendar myCalendar = Calendar.getInstance();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mContext = MainActivity.this;
        initView();
    }

    private void updateLabel() {
        String myFormat = "yyyy-MM-dd"; //In which you need put here
        SimpleDateFormat sdf = new SimpleDateFormat(myFormat, Locale.US);

        et_drivingDate.setText(sdf.format(myCalendar.getTime()));
    }

    private void initView() {
        //Initializing the views
        et_drivingDate = findViewById(R.id.et_drivingDate);
        DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() {

            @Override
            public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                myCalendar.set(Calendar.YEAR, year);
                myCalendar.set(Calendar.MONTH, monthOfYear);
                myCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
                updateLabel();
            }

        };
        et_drivingDate.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                new DatePickerDialog(MainActivity.this, date, myCalendar
                        .get(Calendar.YEAR), myCalendar.get(Calendar.MONTH),
                        myCalendar.get(Calendar.DAY_OF_MONTH)).show();
            }
        });

    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/cardview"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="1dp"
    app:cardCornerRadius="1dp">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <ImageView
            android:id="@+id/listitem_image"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/listitem_title"
            app:srcCompat="@drawable/photo_base" />

        <TextView
            android:id="@+id/listitem_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="성명"
            android:textSize="20dp"
            android:layout_marginLeft="10dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/listitem_subtitles"
            app:layout_constraintStart_toEndOf="@+id/listitem_image"
            app:layout_constraintTop_toTopOf="parent" />

        <LinearLayout
            android:id="@+id/listitem_subtitles"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:orientation="vertical"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/listitem_checkbox"
            app:layout_constraintStart_toEndOf="@+id/listitem_title"
            app:layout_constraintTop_toTopOf="parent">

            <TextView
                android:id="@+id/listcell_subtext1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="서브타이틀1"
                android:textColor="@color/colorBlack"
                android:textSize="14dp"
                android:textStyle="normal" />

            <TextView
                android:id="@+id/listcell_subtext2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="서브타이틀2"
                android:textColor="@color/colorBlack"
                android:textSize="14dp"
                android:textStyle="normal" />

        </LinearLayout>

        <CheckBox
            android:id="@+id/listitem_checkbox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:focusable="false"
            android:visibility="gone"
            android:layout_marginLeft="20dp"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/listitem_subtitles" />

    </androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>

<?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">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        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"
        tools:listitem="@layout/item_listview" />

</androidx.constraintlayout.widget.ConstraintLayout> 

<?xml version="1.0" encoding="utf-8"?>
<ScrollView 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">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:paddingLeft="@dimen/activity_horizontal_margin"
            android:paddingTop="@dimen/activity_vertical_margin"
            android:paddingRight="@dimen/activity_horizontal_margin"
            android:paddingBottom="@dimen/activity_vertical_margin">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="300dp"
                android:gravity="center"
                android:text="Login"
                android:textStyle="bold"
                android:textSize="45dp"
                android:fontFamily="cursive"
                android:textColor="@color/colorWhite"
                android:layout_marginTop="0dp"
                android:background="@drawable/logo"/>

            <com.google.android.material.textfield.TextInputLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="20dp"
                android:layout_marginTop="20dp"
                android:layout_marginRight="20dp">

                <com.google.android.material.textfield.TextInputEditText
                    android:id="@+id/et_id"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@color/colorWhite"
                    android:autofillHints="@string/prompt_id"
                    android:hint="아이디"
                    android:selectAllOnFocus="true" />

            </com.google.android.material.textfield.TextInputLayout>

            <com.google.android.material.textfield.TextInputLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="20dp"
                android:layout_marginTop="10dp"
                android:layout_marginRight="20dp">

                <com.google.android.material.textfield.TextInputEditText
                    android:id="@+id/et_pw"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:autofillHints="@string/prompt_pw"
                    android:hint="비밀번호"
                    android:background="@color/colorWhite"
                    android:imeOptions="actionDone"
                    android:inputType="textPassword"
                    android:selectAllOnFocus="true" />

            </com.google.android.material.textfield.TextInputLayout>

            <com.google.android.material.button.MaterialButton
                android:id="@+id/btn_login"
                style="@style/Widget.AppCompat.Button.Borderless.Colored"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="20dp"
                android:layout_marginTop="50dp"
                android:layout_marginRight="20dp"
                android:padding="10dp"
                android:text="로그인"
                android:textColor="@color/colorWhite"
                android:textSize="16sp"
                android:textStyle="bold"
                app:backgroundTint="@color/colorMint"
                app:cornerRadius="20dp" />

        </LinearLayout>
    </FrameLayout>

</ScrollView>

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    LayoutParams default_layout_params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
    View view1 = inflater.inflate(R.layout.layout1, null);
    addContentView(view1, default_layout_params);          
    View view2 = inflater.inflate(R.layout.layout2, null);
    addContentView(view2, default_layout_params);
    view2.setVisibility(View.INVISIBLE);
    view1.setVisibility(View.VISIBLE);
    view1.bringToFront();
} 

private View view1, view2;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    view1 = getLayoutInflater().inflate(R.layout.layout1, null);
    view2 = getLayoutInflater().inflate(R.layout.layout2, null);
    setContentView(view1);

    someBtn1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            setContentView(view2);
        }
    });


    someBtn2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            setContentView(view1);
        }
    });
}

<?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">

    <LinearLayout
        android:id="@+id/fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:layout_above="@+id/tabmenuLayout" />

    <LinearLayout
        android:id="@+id/tabmenuLayout"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal"
        android:layout_alignParentBottom="true" >

        <Button
            android:id="@+id/btn_tab1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Tab 1"/>

        <Button
            android:id="@+id/btn_tab2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Tab 2"/>

        <Button
            android:id="@+id/btn_tab3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Tab 3"/>

    </LinearLayout>
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    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">

    <TextView
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="프래그먼트 1" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    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"
    android:background="#ffe4e1">

    <TextView
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="프래그먼트 2" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#81DAF5" >

    <TextView
        android:id="@+id/fr_tv03"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_centerInParent="true"
        android:text="프래그먼트 3"
        android:textStyle="bold"/>

</RelativeLayout>

 public class Fragment01 extends Fragment {

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        // onCreateView() : 프래그먼트와 연관된 뷰 계층을 생성하기 위해 호출됨
        // Inflate the layout for this fragment
        ViewGroup rootView = (ViewGroup)inflater.inflate(R.layout.fragment_01, container, false);
        return rootView;
        //return super.onCreateView(inflater, container, savedInstanceState); // Alt + Insert키 누르면 자동 생성되는 return
    }
}

public class Fragment02 extends Fragment {
    TextView textView;
    String strtext;

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            strtext = getArguments().getString("edttext"); // Activity 에서 받은 데이터
        }
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        ViewGroup rootView = (ViewGroup)inflater.inflate(R.layout.fragment_02, container, false);
        textView = (TextView) rootView.findViewById(R.id.fr_tv02);
        textView.setText(strtext);
        return rootView;
        //return super.onCreateView(inflater, container, savedInstanceState);
    }
}

 public class Fragment03 extends Fragment {
    TextView textView;

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        // onCreateView()로 전달된 container 매개변수가 상위 ViewGroup 이며(액티비티의 레이아웃으로부터), 이 안에 프래그먼트 레이아웃이 삽입
        // savedInstanceState 매개변수는 Bundle이며, 프래그먼트가 재개되는 중에 프래그먼트의 이전 인스턴스에 대한 데이터를 제공
        // Inflate the layout for this fragment
        // Inflate 시키고자 하는 Layout 의 Resource ID, Inflated 된 Layout 의 상위가 될 ViewGroup
        ViewGroup rootView = (ViewGroup)inflater.inflate(R.layout.fragment_03, container, false);
        textView = (TextView) rootView.findViewById(R.id.fr_tv03);
        textView.setText("Fragment 3을 선택했네요.");
        return rootView;
    }
}

 public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    Context context;
    private Button tab1, tab2, tab3;
    private Fragment fragment = null;

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

        tab1 = findViewById(R.id.btn_tab1);
        tab2 = findViewById(R.id.btn_tab2);
        tab3 = findViewById(R.id.btn_tab3);

        tab1.setOnClickListener(this);
        tab2.setOnClickListener(this);
        tab3.setOnClickListener(this);

        if(findViewById(R.id.fragment_container) != null){
            if(savedInstanceState != null) return;
            Fragment01 fragment01 = new Fragment01();
            fragment01.setArguments(getIntent().getExtras());

            FragmentManager fragmentManager = getFragmentManager();
            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
            // add() 메서드를 사용하여 프래그먼트를 추가하고, 추가할 프래그먼트와 이를 삽입할 뷰를 지정
            fragmentTransaction.add(R.id.fragment_container, fragment01);
            // FragmentTransaction을 변경하고 나면, 반드시 commit()을 호출해야 변경 내용이 적용됨
            fragmentTransaction.commit();
        }
        // 상세 설명은 https://developer.android.com/guide/components/fragments?hl=ko 참조
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.btn_tab1:
                fragment = new Fragment01();
                changeFragment(fragment);
                break;
            case R.id.btn_tab2:
                Bundle bundle = new Bundle();
                bundle.putString("edttext", "From Activity");
                fragment = new Fragment02();
                fragment.setArguments(bundle); // Fragment 로 데이터 전달
                changeFragment(fragment);
                break;
            case R.id.btn_tab3:
                fragment = new Fragment03();
                changeFragment(fragment);
                break;
        }
    }

    private void changeFragment(Fragment fragment) {
        // 프로그래밍 방식으로 프래그먼트를 기존의 ViewGroup에 추가
        // 액티비티가 실행 중인 동안에는 언제든 액티비티 레이아웃에 프래그먼트를 추가 가능
        // 액티비티 내의 프래그먼트를 관리하려면 FragmentManager를 사용해야 함.
        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.fragment_container,fragment);
        //fragmentTransaction.addToBackStack(null); // back 버튼을 눌렀을 때 동작하는 옵션.
        fragmentTransaction.commit(); // 트랜잭션을 액티비티에 적용하려면 반드시 commit()을 호출해야 함.
    }
}