自定义GridView，添加间隔线

为Gridview添加间隔线有多种方法，这里使用了自定义Gridview方法，重写dispatchDraw 方法，通过Paint来重新绘制界面。直接上代码：

importandroid.annotation.SuppressLint;

importandroid.content.Context;

importandroid.graphics.Canvas;

importandroid.graphics.Paint;

importandroid.util.AttributeSet;

importandroid.util.Log;

importandroid.view.View;

importcom.example.psa.yidongguigu.R;

importin.srain.cube.views.GridViewWithHeaderAndFooter;

@SuppressLint("NewApi")

public classMyGridView2extendsGridViewWithHeaderAndFooter {

public interfaceOnGridScroll2TopListener {

voidscroll2Top();

}

privateOnGridScroll2TopListenerlistener;

public voidsetOnGridScroll2TopListener(OnGridScroll2TopListener listener) {

this.listener= listener;

}

@Override

protected booleanoverScrollBy(intdeltaX, intdeltaY, intscrollX,

intscrollY, intscrollRangeX, intscrollRangeY,

intmaxOverScrollX, intmaxOverScrollY, booleanisTouchEvent) {

if(listener!=null) {

listener.scroll2Top();

}

return super.overScrollBy(deltaX,deltaY,scrollX,scrollY,scrollRangeX,

scrollRangeY,maxOverScrollX,maxOverScrollY,isTouchEvent);

}

@Override

protected voidonScrollChanged(intl, intt, intoldl, intoldt) {

super.onScrollChanged(l,t,oldl,oldt);

Log.e("MyListView"," t: "+ t

+" oldt: "+ oldt +": "+

getScrollY());

}

publicMyGridView2(Context context,AttributeSet attrs) {

super(context,attrs);

}

@Override

protected voidonMeasure(intwidthMeasureSpec, intheightMeasureSpec) {

intexpandSpec = MeasureSpec.makeMeasureSpec(

Integer.MAX_VALUE>>2,MeasureSpec.AT_MOST);

super.onMeasure(widthMeasureSpec,expandSpec);

}

@Override

protected void dispatchDraw(Canvas canvas) {

super.dispatchDraw(canvas);

View localView1 = getChildAt(0);

intcolumn = getWidth() / localView1.getWidth();

Log.i("MyGridView2","column="+ column);

intchildCount = getChildCount();

Paint localPaint;

localPaint =newPaint();

localPaint.setStyle(Paint.Style.STROKE);

localPaint.setColor(getContext().getResources().getColor(R.color.subscribe_seperate_line));

for(inti =0;i < childCount;i++) {

View cellView = getChildAt(i);

//顶部线，坐标+1是为了画在cellView上

canvas.drawLine(cellView.getLeft(),cellView.getTop(),cellView.getRight(),cellView.getTop(),localPaint);

//左边线

canvas.drawLine(cellView.getLeft(),cellView.getTop(),cellView.getLeft(),cellView.getBottom(),localPaint);

if((i +1) % column ==0)//最右边一列单元格画上右边线

{

canvas.drawLine(cellView.getRight(),cellView.getTop(),cellView.getRight(),cellView.getBottom(),localPaint);

}

if((i + column) >= childCount)//最后column个单元格画上底边线

{

Log.i("MyGridView2","画底边线");

canvas.drawLine(cellView.getLeft(),cellView.getBottom(),cellView.getRight(),cellView.getBottom(),localPaint);

}

if(childCount % column !=0&& i == childCount -1)//如果最后一个单元格不在最右一列，单独为它画上右边线

{

canvas.drawLine(cellView.getRight(),cellView.getTop(),cellView.getRight(),cellView.getBottom(),localPaint);

}

}

}

}