下面這個代碼片段大家應該都很熟悉:
@BindView(R.id.lv)
ListView lv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
lv.setAdapter(new BaseAdapter() {
@Override
public int getCount() {
return 20;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, null);
TextView tv_item = (TextView) convertView.findViewById(R.id.tv_item);
tv_item.setText("Demo" + position);
return convertView;
}
});
}
執行效果:
如果讓你添加個頭佈局(腳佈局),是不是so easy,兩行代碼搞定:
View headView = LayoutInflater.from(this).inflate(R.layout.headview, null)
lv.addHeaderView(headView)
但是如果你想操作頭佈局裏面的View怎麼辦?於是我就遇到問題了,在哪綁定頭佈局(腳佈局),怎麼綁定?解決辦法如下:
首先,創建一個ViewHolder,把你要操作的View都在裏面綁定:
class HeaderViewHolder {
@BindView(R.id.tv_headerview)
TextView tv_headerview;
public HeaderViewHolder(View headerRootView) {
ButterKnife.bind(this, headerRootView);
}
}
把頭佈局(腳佈局傳進來),獲取ViewHolder實例就可以各種happy操作了:
HeaderViewHolder headerViewHolder = new HeaderViewHolder(headView)
headerViewHolder.tv_headerview.setText("我是改變後的文字")