Android GridView Tutorial

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MainActivity.java

package com.gridviewdemo;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;


public class MainActivity extends ActionBarActivity {
GridView grid_view;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        grid_view = (GridView) findViewById(R.id.gridview);
        grid_view.setAdapter(new ImageAdapter(this));
        grid_view.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {

Toast.makeText(getBaseContext(), "You click on image "+arg2, Toast.LENGTH_LONG).show();

}

     
        });
    }
}

ImageAdapater.java

package com.gridviewdemo;

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

import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter {
private Context CTX;
private Integer image_id[] = {R.drawable.sample_0,
R.drawable.sample_1, R.drawable.sample_2,
R.drawable.sample_3,
R.drawable.sample_4,
R.drawable.sample_5,
R.drawable.sample_6,
R.drawable.sample_7
};

public ImageAdapter(Context CTX) {

this.CTX = CTX;
// TODO Auto-generated constructor stub
}

@Override
public int getCount() {

return image_id.length;
}

@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}

@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}

@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
ImageView img;
if(arg1 == null)
{
img = new ImageView(CTX);
img.setLayoutParams(new GridView.LayoutParams(160,160));
img.setScaleType(ImageView.ScaleType.CENTER_CROP);
img.setPadding(8, 8, 8, 8);

}
else
{
img = (ImageView) arg1;
}

img.setImageResource(image_id[arg0]);
return img;


// TODO Auto-generated method stub
// return null;
}


}

activity_main.xml

<GridView 

    xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

   android:id="@+id/gridview"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:columnWidth="90dp"

    android:numColumns="auto_fit"

    android:verticalSpacing="10dp"

    android:stretchMode="columnWidth"

    android:gravity="center"

    >

   

</GridView>