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曾经仅仅是简单的重写个BaseAdapter，将getView方法保持抽象。而ViewHolder没有抽象过。

。。

ViewHolder (用了一个集合+泛型管理存取view)

/** * author : stone * email : aa86799@163.com * time : 15/7/24 14 27 */public class StoneViewHolder { private int mPosition; private View mConvertView; private SparseArray<View> mViews; //管理listView-item中的view public StoneViewHolder(Context context, int layoutId, int position, ViewGroup parent) { this.mPosition = position; this.mConvertView = LayoutInflater.from(context).inflate(layoutId, parent, false); this.mConvertView.setTag(this); this.mViews = new SparseArray<View>(); } public View getConvertView() { return mConvertView; } public static StoneViewHolder getInstance(Context context, int layoutId, int position, View convertView, ViewGroup parent) { if (convertView == null) { return new StoneViewHolder(context, layoutId, position, parent); } else { StoneViewHolder holder = (StoneViewHolder) convertView.getTag(); holder.mPosition = position; //更新复用的convertView中 position return holder; } } public <T extends View> T getView(int viewId) { View view = mViews.get(viewId); if (view == null) { view = mConvertView.findViewById(viewId); mViews.put(viewId, view); } return (T) view; } public <T> void setTag(int viewId, T tag) { getView(viewId).setTag(tag); } public <T> T getTag(int viewId) { return (T) getView(viewId).getTag(); } /*------------------------ 设置view属性(以后扩展) --------------------------------*/ public StoneViewHolder setText(int viewId, String text) { ((TextView)getView(viewId)).setText(text); return this; } public StoneViewHolder setText(int viewId, int resId) {//R.string. ((TextView)getView(viewId)).setText(resId); return this; } public StoneViewHolder setImageBitmap(int viewId, Bitmap bitmap) { ((ImageView)getView(viewId)).setImageBitmap(bitmap); return this; } public StoneViewHolder setImageResource(int viewId, int resId) { ((ImageView)getView(viewId)).setImageResource(resId); return this; }}

Adapter

/** * author : stone * email : aa86799@163.com * time : 15/7/24 14 46 */public abstract class StoneListAdapter<T> extends BaseAdapter { private List<T> mData; private Context mContext; private int mLayoutID; public StoneListAdapter(Context context, int layoutID, List<T> data) { this.mContext = context; this.mLayoutID = layoutID; this.mData = data == null ? new ArrayList<T>() : data; } @Override public int getCount() { return mData.size(); } @Override public T getItem(int position) { return mData.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { StoneViewHolder holder = StoneViewHolder.getInstance(mContext, mLayoutID, position, convertView, parent); getView(mContext, holder, position); return holder.getConvertView(); } protected abstract void getView(Context context, StoneViewHolder holder, int position);}

在ListViewActivity中使用

stoneBaseAdapter = new StoneListAdapter<User>(ListViewActivity.this, R.layout.activity_listview_item, mData) { @Override protected void getView(Context context, final StoneViewHolder holder, final int position) { User user = getItem(position); holder.setText(R.id.tv_id, user.getId()).setText(R.id.tv_name, user.getName()) .setText(R.id.tv_age, user.getAge() + ""); holder.getView(R.id.btn_test).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); }};

关于Adapter中View抢焦点：

 假设 listView.setOnItemClickListener(listener)；   且item中的  button.setOnClickListener(listener); 

 无论怎么点击，button会一直被触发...

 仅仅须要在item的root-layout中 加入 一个属性：   android:descendantFocusability="blocksDescendants"

关于item-view复用后。显示混乱：

有时条目过多，滑动到下一屏数据时。有些view复用后，view的状态(比方CheckBox的选种状态。ImageView的图片反复出现)会变乱。

一般处理呢。须要有一个机制，来管理一种相应关系： 当前position相应哪种状态

比方说checkBox选中状态混乱：

class MyAdapter extends StoneListAdapter<User> { private SparseBooleanArray mCheckStateArray; public MyAdapter(Context context, int layoutID, List data) { super(context, layoutID, data); this.mCheckStateArray = new SparseBooleanArray(); } public void setChecked(int position, boolean isChecked) { mCheckStateArray.put(position, isChecked); } public boolean isChecked(int position) { return mCheckStateArray.get(position); } @Override protected void getView(Context context, final StoneViewHolder holder, final int position) { CheckBox cb = holder.getView(R.id.cb_check); cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { setChecked(position, isChecked);//记录状态。防缓存显示 } }); cb.setChecked(isChecked(position)); } }

关于SparseArray

 SparseArray 内部实现是Array数组。当长度不够时，会调用System.arrayCopy
        内部有 keys和values两个数组。

        put(key, value); 二分法查找key应该存放的位置  由于key是Integer类型
        put、get时 两个数组都是操作的同一个位置上的数据

    SparseArray 用于替代形如  HashMap<Integer, Object>
    SparseBooleanArray 用于替代形如  HashMap<Integer, Boolean>
    SparseIntArray 用于替代形如  HashMap<Integer, Integer>
    SparseLongArray 用于替代形如  HashMap<Integer, Long>

  support.v4.util.SparseArrayCompat 提供了v4包相应平台的 SparseArray实现