@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// [1]找到我们关心的控件
ListView lv = (ListView) findViewById(R.id.lv);
//设置数据适配器
lv.setAdapter(new MyAdapter());
}
private class MyAdapter extends BaseAdapter{
@Override
public int getCount() {
return 7;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//[1]想办法把我们自己定义的布局转换成一个view对象 就可以了
View view;
if (convertView == null) {
//创建新的view对象 可以通过打气筒把一个布局资源转换成一个view对象
//resource 就是 我们定义的布局文件
//[一☆☆☆☆]获取打气筒服务
// view = View.inflate(getApplicationContext(), R.layout.item, null);
//[二☆☆☆☆]获取打气筒服务
// view = LayoutInflater.from(getApplicationContext()).inflate(R.layout.item, null);
//[三☆☆☆☆]获取打气筒服务
LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.item, null);
}else {
//复用历史缓存对象
view = convertView;
}
return view;
}
}
}
