Android ListView 万能Adapter 减少80%代码请求置顶 - 黑马程序员技术交流社区

public class GenAdapter extends BaseAdapter {
private List<CityModel> mData;
private Context mContext;
public GenAdapter(List<CityModel> mData, Context mContext) {
super();
this.mData = mData;
this.mContext = mContext;
}
@Override
public int getCount() {
return mData.size();
}
@Override
public CityModel getItem(int pos) {
return mData.get(pos);
}
@Override
public long getItemId(int pos) {
return pos;
}
@Override
public View getView(int pos, View convertView, ViewGroup arg2) {
CityModel model = mData.get(pos);
View view = null;
ViewHolder holder = null;
if (convertView == null) {
view = View.inflate(mContext, R.layout.item_city, null);
holder = new ViewHolder();
holder.tvCityName = (TextView) view.findViewById(R.id.tvCityName);
holder.tvCityCode = (TextView) view.findViewById(R.id.tvCityCode);
view.setTag(holder);
} else {
view = convertView;
holder = (ViewHolder) view.getTag();
}
holder.tvCityName.setText(model.cityName);
holder.tvCityCode.setText(model.cityCode);
return view;
}
private static class ViewHolder {
public TextView tvCityName, tvCityCode;
}
}

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public class ViewHolder {
/**
* listview 一个item的所包含的view 都保存在里面
*/
private SparseArray<View> mViews;
private Context mContext;
private int mPostion;
private View mConvertView;
private ViewHolder(Context context, ViewGroup parent, int layoutId,
int postion) {
this.mContext = context;
this.mPostion = postion;
this.mViews = new SparseArray<View>();
mConvertView = LayoutInflater.from(mContext).inflate(layoutId, parent,
false);
mConvertView.setTag(this);
}
public static ViewHolder get(Context context, View convertView,
ViewGroup parent, int layoutId, int postion) {
if (convertView == null) {
return new ViewHolder(context, parent, layoutId, postion);
} else {
ViewHolder holder = (ViewHolder) convertView.getTag();
holder.mPostion = postion;
return holder;
}
}
public View getConvertView() {
return mConvertView;
}
/**
* 根据资源id获取控件
*
* @param viewId
* @return
*/
public <T extends View> T getView(int viewId) {
View v = mViews.get(viewId);
if (v == null) {
v = mConvertView.findViewById(viewId);
mViews.put(viewId, v);
}
return (T) v;
}
}

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public abstract class CommonAdapter<T> extends BaseAdapter {
protected List<T> mData;
protected Context mContext;
protected LayoutInflater mInflater;
public CommonAdapter(Context mContext) {
super();
mData = new ArrayList<T>();
this.mContext = mContext;
this.mInflater = LayoutInflater.from(mContext);
}
@Override
public int getCount() {
return mData!=null?mData.size():0;
}
@Override
public T getItem(int position) {
return mData.get(position);
}
/**
* 添加数据集合
* @param data
*/
public void addData(List<T> data) {
if (mData == null) {
mData = new ArrayList<T>();
}
mData.addAll(data);
notifyDataSetChanged();
}
/**
* 添加一条数据
* @param t
*/
public void addItem(T t) {
if (mData == null) {
mData = new ArrayList<T>();
}
mData.add(t);
notifyDataSetChanged();
}
/**
* 添加指定位置的一条数据
* @param pos
* @param obj
*/
public void addItem(int pos, T obj) {
if (mData == null) {
mData = new ArrayList<T>();
}
mData.add(pos, obj);
notifyDataSetChanged();
}
/**
* 移除一个item
*
* @param obj
*/
public void removeItem(T obj) {
mData.remove(obj);
notifyDataSetChanged();
}
/**
* 清空数据
*/
public void clear() {
if (mData != null) {
mData.clear();
}
notifyDataSetChanged();
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = ViewHolder.get(mContext, convertView, parent,
getLayoutId(), position);
convert(holder, getItem(position));
return holder.getConvertView();
}
/**
* 将数据赋值到 ui控件上
*
* @param holder
* @param t
*/
public abstract void convert(ViewHolder holder, T t);
/**
* item的布局id
*
* @return
*/
public abstract int getLayoutId();
}

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public class FastAdapter extends CommonAdapter<CityModel> {
public FastAdapter(Context mContext) {
super(mContext);
}
@Override
public void convert(ViewHolder holder, CityModel t) {
holder.setText(R.id.tvCityName, t.cityName);
holder.setText(R.id.tvCityCode, t.cityCode);
}
@Override
public int getLayoutId() {
return R.layout.item_city;
}
}

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