Android中的GridView行背景图像

Question

I want to set background image to all rows of a GridView. I used this code:

GridView gv = (GridView) findViewById(R.id.grid);

    ArrayAdapter<String> aa = new ArrayAdapter<String>(
            this,
            R.layout.row,
            items);

    gv.setAdapter(aa);
    gv.setOnItemClickListener(this);

main.xml: (I set GridView design here)

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

   >
<TextView
    android:id="@+id/selection"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
  android:textSize="14pt"
  android:textStyle="bold"


    />
<GridView
    android:id="@+id/grid"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    android:verticalSpacing="65px"
    android:horizontalSpacing="5px"
    android:numColumns="auto_fit"
    android:columnWidth="100px"
    android:stretchMode="columnWidth"
    android:gravity="center"
    android:fastScrollEnabled="true"
    />

row.xml: (I set rows of Grid view design here)

<LinearLayout
 xmlns:android = "http://schemas.android.com/apk/res/android"
 android:layout_width  = "fill_parent"
 android:layout_height = "wrap_content"
 android:orientation   = "horizontal" 
 android:background="@drawable/rowbg"
 >


<TextView
android:id = "@+id/label"
android:layout_width  = "wrap_content"
android:layout_height = "wrap_content"
android:textSize      = "40sp" />

When i run project it forces to close program. But when I change second row as below, it runs well, ofcorse without any design for rows:

ArrayAdapter<String> aa = new ArrayAdapter<String>(
            this,
            android.R.layout.simple_list_item_1,
            items);

Which part of my code should be changed?

Thanks

---

After running the program with eclipse a dialoge appears: "The application has stopped unexceptedly. Please try again." and in LogCat this message appears: "06-21 12:05:25.724: E/dalvikvm(305): Unable to open stack trace file '/data/anr/traces.txt': Permission denied"

I also try running application on Galaxy S, and I see the same error.

Answer 1

Create an adapter class which extends ArrayAdapter.

In the getView method of this class, inflate the layout for row, access the textview to which the data should be set.

Answer 2

A good solution is to subclass the gridview as described here:

http://erikw.eu/android-row-background-in-gridview/

and reproduced below:

public class MyGridView extends GridView {

    private Bitmap background;

    public MyGridView(Context context, AttributeSet attrs) {
        super(context, attrs);
        background = BitmapFactory.decodeResource(getResources(), R.drawable.bg);
    }


   @Override
    protected void dispatchDraw(Canvas canvas) {
        int count = getChildCount();
        int top = count > 0 ? getChildAt(0).getTop() : 0;
        int backgroundWidth = background.getWidth();
        int backgroundHeight = background.getHeight();
        int width = getWidth();
        int height = getHeight();

        for (int y = top; y < height; y += backgroundHeight){
            for (int x = 0; x < width; x += backgroundWidth){
                canvas.drawBitmap(background, x, y, null);
            }
        }

        super.dispatchDraw(canvas);
    }
}

usage

<your.package.name.MyGridView
    android:id="@+id/mygridview"
    <!-- other GridView configuration parameters -->
    />