Android SimpleAdapter适配器使用详解
作者:sky-update
这篇文章主要介绍了Android SimpleAdapter使用详解的相关资料,需要的朋友可以参考下
Android SimpleAdapter使用详解
HolderAdapter背景
Android的AdapterView用的比较多,ListView,GridView,Spinner等,原生的BaseAdapter对ViewHolder没有支持,每次都要,定义内部类,inflater根布局,对item内部view设置clicklistener并转发到adapter的调用者等。写的次数多了感觉很繁琐,于是写了个简单的封装,简化Adapter的编写,
仓库连接http://git.oschina.net/phodev/SimpleAdapter.
主要文件介绍
1,CommonAdapter.java从BaseAdapter继承,添加了常用的函数,通过泛型约定了List数据源,代替子类实现getCount功能,添加bindClick实现Adapter的OnItemClickListener。
2,BaseViewHolder.java和HolderAdapter结合,实现类似Activity的view初始化方方式onCreate->setContentView->findViewById。
3,HolderAdapter.java从CommonAdapter继承,主要用来驱动BaseViewHolder工作。
使用方法
1,Adapter定义
public class SampleHolderAdapter extends HolderAdapter<Object> { //定义Item内部的点击事件,如果不需要可以不定义 public static final int CLICK_ACTION_ADD = 1; public static final int CLICK_ACTION_UPDATE = 2; public static final int CLICK_ACTION_DELETE = 3; //构造函数配置数据源(可选,或者之后通过setData更新) public SampleHolderAdapter(List<Object> data) { super(data); } @Override public BaseViewHolder<?> createViewHolder(int position) { //创建期望的 ViewHolder return new ViewHolder(); } class ViewHolder extends BaseViewHolder<Object> { Button btn1, btn2, btn3; @Override protected void onCreate(Context context, ViewGroup parent) { //ViewHolder创建后onCreate会被执行1次 setContentView(R.layout.item_test);//setContent支持View或者layout id btn1 = (Button) findViewById(R.id.btn1);//findViewById btn2 = (Button) findViewById(R.id.btn2); btn3 = (Button) findViewById(R.id.btn3); } @Override protected void onDataChanged(int position, Object data) { //adapter getView的时候onDataChanged会被执行一次 btn1.setText("add " + position); btn2.setText("update " + position); btn3.setText("delete " + position); // bindClick(btn1, position, CLICK_ACTION_ADD);//绑定ItemClick,每次都需bind bindClick(btn2, position, CLICK_ACTION_UPDATE); bindClick(btn3, position, CLICK_ACTION_DELETE); } } }
2,Adapter使用
//数据源 private final ArrayList<Object> mData = new ArrayList<>(); //创建Adapter并绑定数据源 private final SampleHolderAdapter mAdapter = new SampleHolderAdapter(mData); @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mListView = (ListView) findViewById(R.id.listview); //绑定Adapter mListView.setAdapter(mAdapter); //设置click listener(由于CommonAdapter支持,并通过bindClick声明) mAdapter.setOnItemClickListener(onItemClickListener); } //ClickListener实现 private OnItemClickListener onItemClickListener = new OnItemClickListener() { @Override public void onItemClick(CommonAdapter<?> adapter, View v, int position, int action) { switch (action) {//action就是我们SampleHolderAdapte中定义并且bindClick的value case SampleHolderAdapter.CLICK_ACTION_ADD: toast(getContext(), position + " add click"); break; case SampleHolderAdapter.CLICK_ACTION_UPDATE: toast(getContext(),position + " update click"); break; case SampleHolderAdapter.CLICK_ACTION_DELETE: toast(getContext(), position + " delete click"); break; } } };
到此定义和使用的代码完毕。
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