[모바일프로그래밍] 12-2 그리드 뷰

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">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="20dp"
        android:layout_marginTop="16dp"
        android:text="GridView Example"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <GridView
        android:id="@+id/gridview01"
        android:layout_width="368dp"
        android:layout_height="545dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="4dp"
        android:layout_marginEnd="16dp"
        android:gravity="center"
        android:numColumns="4"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.454"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

poster_dialog.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">

    <ImageView
        android:id="@+id/poster"
        android:layout_width="337dp"
        android:layout_height="311dp"
        android:layout_marginStart="37dp"
        android:layout_marginTop="42dp"
        android:layout_marginEnd="37dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@android:drawable/screen_background_dark" />
</androidx.constraintlayout.widget.ConstraintLayout>

 

MainActivity.java

package com.example.myapplication;

import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    Integer[] posterID = {R.drawable.cars, R.drawable.charlie_and_the_chocolate_factory,
            R.drawable.chungking_express, R.drawable.coco, R.drawable.dead_poets_society,
            R.drawable.joker, R.drawable.memories_of_matsuko, R.drawable.night_at_the_museum,
            R.drawable.midnight_in_paris, R.drawable.whiplash};

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

        final GridView gv = (GridView) findViewById(R.id.gridview01);
        MyGridViewAdapter gAdapter = new MyGridViewAdapter(this);
        gv.setAdapter(gAdapter);

        gv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                View dialogView = (View) View.inflate(MainActivity.this, R.layout.poster_dialog, null);
                AlertDialog.Builder dlg = new AlertDialog.Builder(MainActivity.this);
                ImageView ivPoster = (ImageView) dialogView.findViewById(R.id.poster);
                ivPoster.setImageResource(posterID[position]);
                dlg.setTitle("큰 포스터");
                dlg.setView(dialogView);
                dlg.setNegativeButton("닫기", null);
                dlg.show();
            }
        });
    }

    public class MyGridViewAdapter extends BaseAdapter {
        Context context;
        public MyGridViewAdapter(Context con) {
            context = con;
        }

        public int getCount() {
            return posterID.length;
        }

        public Object getItem(int arg0) {
            return null;
        }
        public long getItemId(int arg0) {
            return 0;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView imgview = new ImageView(context);
            imgview.setLayoutParams(new ViewGroup.LayoutParams(100, 150));
            imgview.setScaleType(ImageView.ScaleType.FIT_CENTER);
            imgview.setPadding(5, 5, 5, 5);
            imgview.setImageResource(posterID[position]);
            return imgview;
        }
    }
}