Android SimpleAdapter适配器使用详解

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 {
  //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 data) {
    super(data);
  }

  @Override
  public BaseViewHolder createViewHolder(int position) {
    //创建期望的 ViewHolder
    return new ViewHolder();
  }

  class ViewHolder extends BaseViewHolder {
    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 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。

感谢阅读,希望能帮助到大家,谢谢大家对本站的支持!

你可能感兴趣的:(Android SimpleAdapter适配器使用详解)