Notes

main_activity.java
package com.example.enes.grid;

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=findViewById(R.id.myGridView);
gridView.setAdapter(new ImageAdapter(this));
}
}

ImageAdapter.java
package com.example.enes.grid;

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

/**
* Created by enes on 27.10.2017.
*/

public class ImageAdapter extends BaseAdapter {
private Integer[] resimler= {
R.drawable.px1, R.drawable.px2,
R.drawable.px3, R.drawable.px4
};
private Context cagiranSinif;
public ImageAdapter(Context c)
{
cagiranSinif=c;
}
public int getCount()
{
return resimler.length;
}
public Object getItem(int position)
{
return null;
}
public long getItemId(int position)
{
return 0;
}
public View getView(int position, View convertView, ViewGroup parent)
{
ImageView imageView;
if(convertView==null)
{
imageView =new ImageView(cagiranSinif);
imageView.setLayoutParams(new GridView.LayoutParams(135,85));
imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
imageView.setPadding(0,0,0,0);
}
else {
imageView= (ImageView) convertView;
}
imageView.setImageResource(resimler [position]);
return imageView;
}
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/myGridView"
android:numColumns="auto_fit"
android:verticalSpacing="10px"
android:horizontalSpacing="1px"
android:gravity="center"
>

</GridView>