그림으로 쉽게 설명하는 안드로이드 프로그래밍(개정6판) 연습문제 8장

정답이 아닐 수 있습니다. 오류가 있으면 알려주세요ㅎ

 

1.

<ListView
    android:id="@+id/list"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

 

2. Adapter

 

3.

ArrayAdapter - 배열

CursorAdapter - 데이터베이스

 

4. 주석 붙이면 됨

 

5.

activity_main.xml

<?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">

    <ListView
        android:id="@+id/list"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

listitem.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:orientation="horizontal">

    <ImageView
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_margin="5dp"
        android:src="@drawable/android" />

    <TextView
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="15dp"
        android:textSize="30dp"
        android:textStyle="bold" />

</LinearLayout>

MainActivity.java

package kr.co.company.ch8;

import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    ListView list;
    String[] values = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        CustomList adapter = new CustomList(MainActivity.this);
        list = findViewById(R.id.list);
        list.setAdapter(adapter);
    }

    public class CustomList extends ArrayAdapter<String> {
        private final Activity context;

        public CustomList(Activity context) {
            super(context, R.layout.listitem, values);
            this.context = context;
        }

        @Override
        public View getView(int position, View view, ViewGroup parent) {
            LayoutInflater inflater = context.getLayoutInflater();
            View rowView = inflater.inflate(R.layout.listitem, null, true);
            TextView textView = rowView.findViewById(R.id.text);
            textView.setText(values[position]);
            return rowView;
        }
    }
}

결과

 

6. columns = 1; //제 예상입니다. 직접 안해봄.

 

7.

activity_main.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">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="100dp"
    android:layout_height="90dp">

    <ImageView
        android:id="@+id/image"
        android:layout_width="80dp"
        android:layout_height="80dp" />

</RelativeLayout>

MainActivity.java

package kr.co.company.ch8;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {
    MyAdapter adapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        RecyclerView recyclerView = findViewById(R.id.rview);
        int columns = 4;
        recyclerView.setLayoutManager(new GridLayoutManager(this, columns));
        adapter = new MyAdapter(this);
        recyclerView.setAdapter(adapter);
    }
}

MyAdapter.java

package kr.co.company.ch8;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ImageView;

import androidx.recyclerview.widget.RecyclerView;

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private LayoutInflater mInflater;
    int[] images = {
            R.drawable.movie1,
            R.drawable.movie2,
            R.drawable.movie3,
            R.drawable.movie4
    };

    MyAdapter(Context context) {
        this.mInflater = LayoutInflater.from(context);
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = mInflater.inflate(R.layout.item, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.imageView.setImageResource(images[position % 4]);
    }

    @Override
    public int getItemCount() {
        return 40;
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        ImageView imageView;

        ViewHolder(View itemView) {
            super(itemView);
            imageView = itemView.findViewById(R.id.image);
        }
    }
}

결과