앱만들기.34 (ViewPager androidx ver)

탭같은거 이용해서 뷰를 넘기면서 교체해가는거

 

 

implementation 'com.google.android.material:material:1.5.0-alpha01'

이거 임포트하면 생김

 

세가지 화면을 교체하는 방식을 액티비티가 아닌, 프래그먼트로 세 조각을 교체하는 과정을 만듦

 

프래그먼트 표시영역 지정 - 네모영역안에서 배치해줌에 따라서 표시가 될 것

( height 설정해줘서 margin영역 정해줌)

 

 

viewpager추가해주기

 

Monday fragment xml만들어줌

 

 

 

Main.js

package com.example.viewpagerexample;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentPagerAdapter;
import androidx.viewpager.widget.ViewPager;

import android.os.Bundle;
import android.widget.TableLayout;

import com.google.android.material.tabs.TabLayout;

public class MainActivity extends AppCompatActivity {

    private FragmentPagerAdapter fragmentPagerAdapter;



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

        //뷰페이저 세팅
        ViewPager viewPager = findViewById(R.id.viewPager);
        fragmentPagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());

        TabLayout tabLayout = findViewById(R.id.tab_layout); //상단영역
        viewPager.setAdapter(fragmentPagerAdapter); //뷰페이저에 프래그먼트어댑터연동
        tabLayout.setupWithViewPager(viewPager); //탭레이아웃에 뷰페이저연동

    }
}

MondayFragment.js (Tuesday, Wednesday바꾸기만하면됨)

package com.example.viewpagerexample;

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 FragMonday extends Fragment {

    private View view;
    //뷰페이저는 상태저장해야함

    //일단 객체를 자체적으로 생성
    public static FragMonday newinstance(){
        FragMonday fragMonday = new FragMonday();
        return fragMonday; //어댑터에 맞춰서 주기적으로 인스턴스 생성해서 만들어지는 로직 실행구성구문
    }



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

        return view;
    }
}

ViewpagerAdapter.js

package com.example.viewpagerexample;

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

public class ViewPagerAdapter extends FragmentPagerAdapter {
    public ViewPagerAdapter(@NonNull  FragmentManager fm) {
        super(fm);
    }

    @NonNull
    @Override
    //아까 선언한 인스턴스를 어댑터로 불러들이기
    //프래그먼트 교체를 보여주는 처리를 구현하느곳
    public Fragment getItem(int position) {
        //switch문 , 프래그먼트의 위치에따라서 어떤 뷰를 띄워줄것이냐
        switch (position){
            case 0:
                return FragMonday.newinstance();

            case 1:
                return FragTuesday.newinstance();

            case 2:
                return FragWednesday.newinstance();
            default:
                return null;
        }

    }

    //갯수를 명시해주는, 우린 3가지 뷰페이저 구현
    @Override
    public int getCount() {
        return 3;
    }

    //상단의 탭 레이아웃 인디케이터 쪽에 텍스트를 선언해주는곳
    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        switch (position){
            case 0:
                return "Monday";

            case 1:
                return "Tuesday";

            case 2:
                return "Wednesday";
            default:
                return null;
        }

    }
}

 

main.xml (design탭으로했음)

<?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">

    <com.google.android.material.tabs.TabLayout
        android:id="@+id/tab_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toTopOf="@+id/const_vp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

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

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

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

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/const_vp"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tab_layout">

        <androidx.viewpager2.widget.ViewPager2
            android:id="@+id/viewPager"
            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" />
    </androidx.constraintlayout.widget.ConstraintLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

Monday.xml (나머지요일도 같음, 디자인탭활용)

<?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/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="촬리의월요일"
        android:textColor="#304FFE"
        android:textSize="48sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

 

 

결과

 

또!!어플중지

짜증난다진짜

2021-08-09 23:53:46.106 4675-4675/com.example.viewpagerexample E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.viewpagerexample, PID: 4675
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.viewpagerexample/com.example.viewpagerexample.MainActivity}: java.lang.ClassCastException: androidx.viewpager2.widget.ViewPager2 cannot be cast to androidx.viewpager.widget.ViewPager
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3449)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
     Caused by: java.lang.ClassCastException: androidx.viewpager2.widget.ViewPager2 cannot be cast to androidx.viewpager.widget.ViewPager
        at com.example.viewpagerexample.MainActivity.onCreate(MainActivity.java:24)
        at android.app.Activity.performCreate(Activity.java:8000)
        at android.app.Activity.performCreate(Activity.java:7984)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3422)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:223) 
        at android.app.ActivityThread.main(ActivityThread.java:7656) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947) 

 

일단 내일 오류찾기위해 로그캣올려놓는다.

아 진짜짜증난다 난 못해먹겠음