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Android 给 GridView 设置单元格分割线 - MayGodBlessYou
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<h1>Android 给 GridView 设置单元格分割线</h1>
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<span class="date">2015/06/12</span>
<span>posted in </span>
<span class="posted-in"><a href='Android.html'>Android</a></span>
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<p>给GridView设置单元格分割线有两种方法,一种是设置背景图片设置分割线,另外一种是自定义GridView重绘视图设置分割线。</p>
<span id="more"></span><!-- more -->
<p>重绘方法代码如下:</p>
<pre><code class="language-plain_text">public class LineGridView extends GridView{
public LineGridView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
public LineGridView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public LineGridView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void dispatchDraw(Canvas canvas){
super.dispatchDraw(canvas);
View localView1 = getChildAt(0);
int column = getWidth() / localView1.getWidth();
int childCount = getChildCount();
Paint localPaint;
localPaint = new Paint();
localPaint.setStyle(Paint.Style.STROKE);
localPaint.setColor(getContext().getResources().getColor(R.color.grid_line));
for(int i = 0;i < childCount;i++){
View cellView = getChildAt(i);
if((i + 1) % column == 0){
canvas.drawLine(cellView.getLeft(), cellView.getBottom(), cellView.getRight(), cellView.getBottom(), localPaint);
}else if((i + 1) > (childCount - (childCount % column))){
canvas.drawLine(cellView.getRight(), cellView.getTop(), cellView.getRight(), cellView.getBottom(), localPaint);
}else{
canvas.drawLine(cellView.getRight(), cellView.getTop(), cellView.getRight(), cellView.getBottom(), localPaint);
canvas.drawLine(cellView.getLeft(), cellView.getBottom(), cellView.getRight(), cellView.getBottom(), localPaint);
}
}
if(childCount % column != 0){
for(int j = 0 ;j < (column-childCount % column) ; j++){
View lastView = getChildAt(childCount - 1);
canvas.drawLine(lastView.getRight() + lastView.getWidth() * j, lastView.getTop(), lastView.getRight() + lastView.getWidth()* j, lastView.getBottom(), localPaint);
}
}
}
}
</code></pre>
<p>在<code>dispatchDraw</code>方法中,我们对每一个子view的边界按照一定的方式绘上了边框,一般一个格子只需绘制其中两条边,需要注意的是最边上的格子需要特殊处理。<code>super.dispatchDraw(canvas);</code>一定要调用,不然格子中的内容(子view)就得不到绘制的机会。<br />
仔细看代码你会发现这个实现方式是很好的,但是代码并不完美,因为每条线的绘制我们都是以第一个子view 的宽高为基准的,如果某个格子的高度和第一个格子不一致,那么可能出现错位。如果你能确保每个格子大小均匀,直接拿来用,否则还需要些修改。这里是重写的<code>dispatchDraw</code>,其实我我们重写onDraw方法也可以得到相同的结果。要完全弄明白的话,就得看看FrameWork中GridView的源码了。</p>
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