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listview相关代码整理
虽然listview已经慢慢被替代了, 不过还是整理下 , 留作纪念吧
/** * 获取 listview 实际滚动的距离. [ 相对于listview的第一个项目左上角.] * * @return */ public static synchronized int getScrollY(AbsListView listView) { if (null == listView) return 0; View c = listView.getChildAt(0); if (c == null) { return 0; } int firstVisiblePosition = listView.getFirstVisiblePosition(); int top = c.getTop(); int mMax = 0; for (int i = 0; i < firstVisiblePosition; i++) { View v = listView.getChildAt(i); if (null != v) { mMax += v.getHeight(); } } return (-top + mMax); }
一个封装过的通用adapter
public abstract class BaseAdapterEx<D, VH extends BaseAdapterEx.ViewHolder> extends BaseAdapter { protected int[] mResIds = null; protected Context mContext; protected LayoutInflater mInflater; /** * 支持创建多种格式的布局文件. 默认获取资源对应方式为: resIds[ position % resIds.length ] * * @param context * @param resIds */ public BaseAdapterEx(Context context, int... resIds) { this.mContext = context; this.mResIds = resIds; mInflater = LayoutInflater.from(mContext); } @Override public boolean isEnabled(int position) { return mData =http://www.mamicode.com/= null || mData.size() > position; } protected final Object mLocker = new Object(); protected List<D> mData = http://www.mamicode.com/new ArrayList<D>(); public void clear() { synchronized (mLocker) { if (!mData.isEmpty()) { mData.clear(); notifyDataSetChanged(); } } } public List<D> getData() { return mData; } public void setData(Collection<D> data) { synchronized (mLocker) { mData.clear(); mData.addAll(data); notifyDataSetChanged(); } } public void setData(D[] data) { setData(Arrays.asList(data)); } public D getItem(int position) { if (position >= 0 && mData != null && position < mData.size()) { return mData.get(position); } return null; } @Override public int getCount() { return (null == mData ? 0 : mData.size()); } @Override public boolean areAllItemsEnabled() { return super.areAllItemsEnabled(); } public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { VH holder = null; if (null == convertView) { convertView = onCreateView(position, parent); holder = onCreateViewHolder(position, convertView); if (null != convertView) { convertView.setTag(holder); } } else { holder = (VH) convertView.getTag(); } onBindViewHolder(position, holder); return convertView; } /** * bind data to the view. * * @param position * @param holder */ protected abstract void onBindViewHolder(int position, VH holder); /** * create ViewHolder, never return null. * * @param position * @param convertView * @return */ protected abstract VH onCreateViewHolder(int position, View convertView); protected View onCreateView(int position, ViewGroup parent) { int resId = getResId(position); if (0 != resId) { return mInflater.inflate(resId, parent, false); } return null; } /** * 获取具体的资源文件ID. * * @param position * @return */ protected int getResId(int position) { if (null != mResIds && mResIds.length > 0) { return mResIds[position % mResIds.length]; } return 0; } public static class ViewHolder { public View itemView; public ViewHolder() { } public ViewHolder(View itemView) { this.itemView = itemView; } }}
listview相关代码整理
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