Android jeu de la GridView pour avoir 2 colonnes par ligne uniquement

Voici mon code dans mon Activité:

public class GridViewActivity extends Activity {

    GridView gridView;

    static final String[] MOBILE_OS = new String[] { "Android", "iOS",
            "Windows", "Blackberry" };

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        gridView = (GridView) findViewById(R.id.gridView1);

        gridView.setAdapter(new ImageAdapter(this, MOBILE_OS));

        gridView.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v,
                    int position, long id) {
                Toast.makeText(
                        getApplicationContext(),
                        ((TextView) v.findViewById(R.id.grid_item_label))
                                .getText(), Toast.LENGTH_SHORT).show();

            }
        });

    }

}

Et à mon Image de l'Adaptateur:

public class ImageAdapter extends BaseAdapter {
private Context context;
private final String[] mobileValues;
private TextView t;
public ImageAdapter(Context context, String[] mobileValues) {
this.context = context;
this.mobileValues = mobileValues;
}
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View gridView;
if (convertView == null) {
gridView = new View(context);
//get layout from mobile.xml
gridView = inflater.inflate(R.layout.mobile, null);
//set value into textview
TextView textView = (TextView) gridView
.findViewById(R.id.grid_item_label);
textView.setText(mobileValues[position]);
Button b = (Button) gridView.findViewById(R.id.grid_item_button);
Button b2 = (Button) gridView.findViewById(R.id.grid_item_button2);
t = (TextView) gridView
.findViewById(R.id.grid_item_number);
b.setOnClickListener(new MyOnClickListener(t));
b2.setOnClickListener(new MyOnClickListenerm(t));
//set image based on selected text
ImageView imageView = (ImageView) gridView
.findViewById(R.id.grid_item_image);
String mobile = mobileValues[position];
if (mobile.equals("Windows")) {
imageView.setImageResource(R.drawable.windows_logo);
} else if (mobile.equals("iOS")) {
imageView.setImageResource(R.drawable.ios_logo);
} else if (mobile.equals("Blackberry")) {
imageView.setImageResource(R.drawable.blackberry_logo);
} else {
imageView.setImageResource(R.drawable.android_logo);
}
} else {
gridView = (View) convertView;
}
return gridView;
}
private void clickedButton(TextView tv){
int num = Integer.parseInt(tv.getText().toString());
++num;
tv.setText(Integer.toString(num));
}
private void clickedButtonm(TextView tv){
int num = Integer.parseInt(tv.getText().toString());
if(num>0){
--num;
tv.setText(Integer.toString(num));
}
}
@Override
public int getCount() {
return mobileValues.length;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
class MyOnClickListener implements OnClickListener{
public final TextView tv;
public MyOnClickListener(TextView tv){
this.tv=tv;
}
@Override
public void onClick(View v) {
//TODO Auto-generated method stub
clickedButton(tv);
}
}
class MyOnClickListenerm implements OnClickListener{
public final TextView tv;
public MyOnClickListenerm(TextView tv){
this.tv=tv;
}
@Override
public void onClick(View v) {
//TODO Auto-generated method stub
clickedButtonm(tv);
}
}
}

et mon mobile.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp" >
<ImageView
android:id="@+id/grid_item_image"
android:layout_width="wrap_content"
android:layout_height="74dp"
android:layout_marginRight="10px"
android:layout_weight="1.44"
android:src="@drawable/android_logo" >
</ImageView>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/grid_item_button"
android:layout_width="30dp"
android:layout_height="23dp"
android:text=" " />
<TextView
android:id="@+id/grid_item_number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="0" />
<Button
android:id="@+id/grid_item_button2"
android:layout_width="30dp"
android:layout_height="23dp"
android:text=" " />
</LinearLayout>
<TextView
android:id="@+id/grid_item_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5px"
android:text="@+id/label"
android:textSize="15px" >
</TextView>
</LinearLayout>

Je trouve ça un peu inquiétant de ne pas être en mesure de pout 2 articles par ligne. Je voudrais savoir comment formater mon GridView pour être en mesure de remplir cette idée

Voici mon code source: http://www.mediafire.com/?25vae87fvahu4wp