Android GridView サンプル

Activityレイアウト

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="info.typea.kaigiutil.MainActivity">
 
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal">
        <GridView
            android:id="@+id/grid_menu"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:numColumns="auto_fit"
            android:gravity="center">
 
        </GridView>
    </LinearLayout>
</android.support.constraint.ConstraintLayout>

Activity

package info.typea.kaigiutil;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.GridView;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
 
        GridView gridView = (GridView)findViewById(R.id.grid_menu);
 
        gridView.setAdapter(new MenuItemAdapter(this));
    }
}

Adapter

package info.typea.kaigiutil;
 
import android.content.Context;
import android.media.Image;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
 
/**
 * Created by pppiroto on 2017/09/09.
 */
public class MenuItemAdapter extends BaseAdapter{
    private Context context;
 
    private Integer[] menuItemThumbIds = {
            R.mipmap.ic_launcher,
            R.mipmap.ic_launcher,
            R.mipmap.ic_launcher,
            R.mipmap.ic_launcher,
            R.mipmap.ic_launcher,
            R.mipmap.ic_launcher,
            R.mipmap.ic_launcher
    };
 
    public MenuItemAdapter(Context context) {
        this.context = context;
    }
 
 
    @Override
    public int getCount() {
        return menuItemThumbIds.length;
    }
 
    @Override
    public Object getItem(int position) {
        return null;
    }
 
    @Override
    public long getItemId(int position) {
        return 0;
    }
 
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;
 
        if (convertView == null) {
            imageView = new ImageView(this.context);
            imageView.setLayoutParams(new GridView.LayoutParams(85,85));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setPadding(0,0,0,0);
        } else {
            imageView = (ImageView) convertView;
        }
        imageView.setImageResource(menuItemThumbIds[position]);
 
        return imageView;
    }
}