Android 30

今天学习了gridview 网格视图，gridview和baseadapter的连用

gridview中有个属性 numColumns 代表网格列数

1.新建适配器继承BaseAdapter；

重写方法，编写新建的适配器的构造方法。

public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder viewHolder;
    if (convertView == null){
        convertView = LayoutInflater.from(context).inflate(resource,parent,false);
        viewHolder = new ViewHolder();
        viewHolder.imageView = convertView.findViewById(R.id.iv_grid_image);
        viewHolder.textView = convertView.findViewById(R.id.tv_grid_name);
        convertView.setTag(viewHolder);
    }else{
        viewHolder = (ViewHolder) convertView.getTag();
    }
    viewHolder.imageView.setImageResource(icons[position]);
    viewHolder.textView.setText(names[position]);
    return convertView;
}
class ViewHolder{
    ImageView imageView;
    TextView textView;

}