<span style="font-family:Microsoft YaHei;font-size:12px;">在实际开发的时候,Adapter用的比较多,通常复杂点的项目都会用到BaseAdapter,当然有很多大牛都写了通用的Adapter.</span>
在GitHub上有BaseAdapter的实现:
https://github.com/JoanZapata/base-adapter-helper ;
这是CSDN博客上的实现:
http://blog.csdn.net/lmj623565791/article/details/38902805;
http://blog.csdn.net/bboyfeiyu/article/details/38947721;
以及http://stormzhang.github.io/androidtips/2014/08/31/android-common-simplebaseadapter/;
最后一个是最简单的,而且我觉得是最好的,因为需求总是不断变化的,我们需要改的地方还有很多,所以不需要面
面俱到用的时候在修改即可.
贴出最后一个实现的代码:
<span style="font-family:Microsoft YaHei;font-size:12px;">import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.util.SparseArray;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
public abstract class SimpleBaseAdapter<T> extends BaseAdapter {
protected Context context;
protected List<T> data;
public SimpleBaseAdapter(Context context, List<T> data) {
this.context = context;
this.data = (data == null ? new ArrayList<T>(0)
: new ArrayList<T>(data));
}
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int position) {
if (position > data.size()) {
return null;
}
return data.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
/**
* 该方法需要子类实现,需要返回item布局的resource id
*
* @return 布局的resource id
*/
public abstract int getItemResource();
/**
* 使用该getItemView方法替换原来的getView方法,需要子类实现
* 查找控件用viewHolder的getView传入id
*
* @param position
* @param convertView
* @param parent
* @param holder
* @return
*/
public abstract View getItemView(int position, View convertView,
ViewHolder holder);
@SuppressWarnings("unchecked")
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (null == convertView) {
convertView = View.inflate(context, getItemResource(), null);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
return getItemView(position, convertView, holder);
}
/**
* ViewHolder可以获取控件
* @author ...
*
*/
public class ViewHolder {
private SparseArray<View> views = new SparseArray<View>(0);
private View convertView;
public ViewHolder(View convertView) {
this.convertView = convertView;
}
@SuppressWarnings({ "unchecked", "hiding" })
public <T extends View> T getView(int resId) {
View v = views.get(resId);
if (null == v) {
v = convertView.findViewById(resId);
views.put(resId, v);
}
return (T) v;
}
}
/**
* 添加在头部
*
* @param elem
*/
public void addFirst(List<T> elem) {
data.addAll(0, elem);
notifyDataSetChanged();
}
/**
* 添加在尾部
*
* @param elem
*/
public void addLast(List<T> elem) {
data.addAll(elem);
notifyDataSetChanged();
}
/**
* 按位置添加
*
* @param position
* @param elem
*/
public void addByPosition(int position, List<T> elem) {
data.addAll(position, elem);
notifyDataSetChanged();
}
/**
* 根据元素移除数据
*
* @param elem
*/
public void remove(T elem) {
data.remove(elem);
notifyDataSetChanged();
}
/**
* 根据位置移除数据
*
* @param index
*/
public void remove(int index) {
data.remove(index);
notifyDataSetChanged();
}
/**
* 替换所有数据
*
* @param elem
*/
public void replaceAll(List<T> elem) {
data.clear();
data.addAll(elem);
notifyDataSetChanged();
}
}</span>
使用也很简单:
<span style="font-family:Microsoft YaHei;font-size:12px;">import java.util.List;
import android.content.Context;
import android.view.View;
import android.widget.TextView;
public class MyAdapter extends SimpleBaseAdapter<String> {
public MyAdapter(Context context, List<String> data) {
super(context, data);
}
@Override
public int getItemResource() {
return android.R.layout.simple_list_item_1;
// return R.layout.list_cell_item;
}
@Override
public View getItemView(int position, View convertView,
SimpleBaseAdapter<String>.ViewHolder holder) {
// TextView t = holder.getView(R.id.tv);
TextView t = holder.getView(android.R.id.text1);
t.setText(getItem(position).toString());
return convertView;
}
}</span>
这段代码应该很好懂的.