how to set gravity to center of textview in Android gridview?

[Jiayu Shao]

I have a gridview of textview and checkbox in an android project. When I add setGravity(Gravity.Center) in adapter class, the result prints the first data in second row. It should output in the first row. The row number is exactly the same as rows of data in txt file. Below is my code. When I call onItemClick in Activity class with getItemAtPosition method, the item on clicked items are correct. If you see the picture below, even though the first row of textviews show nothing getItemAtPosition method does read my first row of my txt file(which is also the next row in the picture below).
Could someone tells me why this is happening and how to solve this issue?

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
  
 <GridView
     android:id="@+id/gridview2"
     android:layout_width="wrap_content"
     android:layout_height="0dip"
     android:layout_weight="0.23"
     android:gravity="center"
     android:horizontalSpacing="10dp"
     android:stretchMode="columnWidth"
     android:verticalSpacing="10dp" />
 <GridView
     android:id="@+id/gridview"
     android:layout_width="wrap_content"
     android:layout_height="0dip"
     android:layout_weight="1"
     android:gravity="center"
     android:horizontalSpacing="10dp"
     android:stretchMode="columnWidth"
     android:verticalSpacing="10dp" >
 </GridView>

 <CheckBox android:id="@+id/checkbox1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="end"
        android:text="@string/chk_1"
        android:onClick="onCheckboxClicked"/>

 <Button
     android:id="@+id/delete"
     android:layout_width="wrap_content"
     android:layout_height="50dp"
     android:text="@string/del_button" 
     android:onClick="delItem"/>

</LinearLayout>


public class TextAdapter extends BaseAdapter {
	
	private Context context;
	private String[] txt;
	
	public TextAdapter(Context c, String[] t){
		context = c;
		txt = t;
	}
	
	@Override
	public int getCount() {
		return txt.length;
	}

	@Override
	public Object getItem(int position) {
		return txt[position];
	}

	@Override
	public long getItemId(int position) {
		return 0;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		TextView tv;
		
		if(txt[position] == "\\n")
		{
			CheckBox cb = new CheckBox(context);
			cb.setScaleX(0.7f);
			cb.setScaleY(0.7f);
			cb.setGravity(Gravity.CENTER);
			return cb;
		}
		else {
			if (convertView == null) 
			{
				tv = new TextView(context);
	            tv.setLayoutParams(new GridView.LayoutParams(85, 85));
	        } 
			else 
			{
					tv = (TextView) convertView;
			}
			tv.setText(txt[position]);
			tv.setTextSize(9);
			
			int maxLength = 10;
	        InputFilter[] fArray = new InputFilter[1];
	        fArray[0] = new InputFilter.LengthFilter(maxLength);
	        tv.setFilters(fArray);
			
			tv.setGravity(Gravity.CENTER);
			return tv;
		}
	}
}