android随意记

1、

listview中的item滚动变黑的原因和解决办法

<ListView android:id="@+id/listview" android:layout_width="fill_parent"

android:fadingEdge="none" android:scrollingCache="false"

android:layout_height="fill_parent" android:divider="@null"

android:cacheColorHint="#00000000" android:fadeScrollbars="true" />

2、去除listitem选中边框颜色

android:listSelector="#00000000"

3、listView 滚动卡顿，使用adapter的缓存机制

public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder holder;
if (convertView == null)
{
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.topic_list, null);
holder.title = (TextView) convertView.findViewById(R.id.title);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder) convertView.getTag();
}
}

4.获取组件高度（宽度）
public static int getHeight(View view)
{
int w = View.MeasureSpec.makeMeasureSpec(0,
View.MeasureSpec.UNSPECIFIED);
int h = View.MeasureSpec.makeMeasureSpec(0,
View.MeasureSpec.UNSPECIFIED);
view.measure(w, h);
return view.getMeasuredHeight();
}