Android GridView imperfection, how to remove extra white space to the right

Question

I have a GridView based calendar. I have the following XML layout with the selector set to null thus android:listSelector="@null" in accordance with advise I have got from this site. Now I am getting a few pixels wide strip to the right of the GridView. Why? I have tried everything I can but to avail. Here is my XML layout:

        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="fill_parent"
            android:layout_height="match_parent"
            android:orientation="vertical" >

            <GridView
                android:id="@+id/calendar"
                android:layout_width="fill_parent"
                android:layout_height="match_parent"
                android:horizontalSpacing="-1px"
                android:numColumns="7"
                android:stretchMode="columnWidth" 
                android:gravity="center"
                android:verticalSpacing="-1px"
                android:listSelector="@null" >

            </GridView>

        </LinearLayout>

What I get is this picture:

Answer 1

This space is due to imperfect calculation for each row of your grid. For example your device width is 320 px and you have 7 rows, try any calculation that meets 320 px. If the width of each cell is 45.71428571428571 px, only then it can be reduced.

Other option

apply android:gravity="center" property in you grid so that spaces will equally divided from left to right

Answer 2

in my case I had horizontal spacing as 1dp

android:horizontalSpacing="1dp"

so to solve this I just put the right padding as -1dp

android:paddingRight="-1dp"

even though I expected to get a space on the left side due to this , but it worked properly

Answer 3

Try using

android:layout_margin="0dp"
android:padding="0dp"

Also you might have that space allocated for the scroll bar.
And why do you have your vertical and horizontal spacing with negative values?

Answer 4

I had the same problem though in my case I didn't have control over the GridView instance so I couldn't read the column width. Nevertheless I could subclass its container.
This isn't very orthodox but you can override the onMeasure method and add a few pixels.
Something like this:

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    final int RIGHT_MARGIN_OVERSIZE_DIP = 6;
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    int width = this.getMeasuredWidth()
    int overSize = (int)((getResources().getDisplayMetrics().density*RIGHT_MARGIN_OVERSIZE_DIP) + 0.5f);
    widthMeasureSpec = MeasureSpec.makeMeasureSpec(width + overSize, MeasureSpec.getMode(widthMeasureSpec));        
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

Answer 5

grid.setColumnWidth(grid.getColumnWidth()+1);

This will get the current ColumnWidth and add 1 pixel to it. Remember to use this after onCreateView,since the grid needs to be initialized before that.

Also,your grid view,should use match_parent (height and width).The image/layout in the column should be also match_parent.