package com.sina.show.activity.custom; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Matrix; import android.graphics.Rect; import android.view.ViewGroup; import android.widget.GridView; import com.sina.show.R; /** * 设置一行的背景 * * @ClassName: MyGridView * @date 2012-10-29 下午04:25:01 * */ public class MyGridViewLineBackground extends GridView { private static String NAMESPACE_ANDROID = "http://schemas.android.com/apk/res/android"; private Bitmap mBmp; private int mColumnNum; private int mRowBgHeight; public MyGridViewLineBackground(Context context, android.util.AttributeSet attrs) { super(context, attrs); mBmp = BitmapFactory.decodeResource(getResources(), R.drawable.room_more_line); //获得列数 mColumnNum = attrs.getAttributeIntValue(NAMESPACE_ANDROID,"numColumns",3); // mRowBgHeight = 23; } @Override protected void dispatchDraw(Canvas canvas) { //图片的行高 int rHeight = ((ViewGroup)getChildAt(0)).getChildAt(0).getHeight(); int width = getWidth(); int rowNum = (int)Math.ceil(getChildCount()/(double)mColumnNum); //源绘制矩形 Rect src = new Rect(0,0,mBmp.getWidth(),mBmp.getHeight()); for(int i=0,y=rHeight-mRowBgHeight; i<rowNum; i++,y += rHeight){ //目的绘制矩形 Rect dst = new Rect(0,y,width,y+mRowBgHeight); canvas.drawBitmap(mBmp,src,dst,null); } super.dispatchDraw(canvas); } }
使用
<com.sina.show.activity.custom.MyGridViewLineBackground android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/room_main_bottom_grd_more" android:cacheColorHint="#00000000" android:listSelector="#00000000" android:layout_weight="1" android:fadingEdge="none" android:numColumns="3" android:layout_marginTop="10dip" android:horizontalSpacing="0dip" android:paddingLeft="20dip" android:paddingRight="20dip" />