Android SimpleAdapter

HolderAdapter背景

Android的AdapterView用的比較多，ListView，GridView，Spinner等，原生的BaseAdapter對ViewHolder沒有支持，每次都要，定義內部類，inflater根佈局，對item內部view設置clicklistener並轉發到adapter的調用者等。寫的次數多了感受很繁瑣，因而寫了個簡單的封裝，簡化Adapter的編寫，倉庫鏈接http://git.oschina.net/phodev/SimpleAdapter.

主要文件介紹

1，CommonAdapter.java從BaseAdapter繼承，添加了經常使用的函數，經過泛型約定了List數據源，代替子類實現getCount功能,添加bindClick實現Adapter的OnItemClickListener。

2，BaseViewHolder.java和HolderAdapter結合，實現相似Activity的view初始化方方式onCreate->setContentView->findViewById。

3，HolderAdapter.java從CommonAdapter繼承，主要用來驅動BaseViewHolder工做。

使用方法

1,Adapter定義

public class SampleHolderAdapter extends HolderAdapter<Object> {
    //定義Item內部的點擊事件，若是不須要能夠不定義
    public static final int CLICK_ACTION_ADD = 1;
    public static final int CLICK_ACTION_UPDATE = 2;
    public static final int CLICK_ACTION_DELETE = 3;
    //構造函數配置數據源（可選，或者以後經過setData更新）
    public SampleHolderAdapter(List<Object> data) {
        super(data);
    }

    @Override
    public BaseViewHolder<?> createViewHolder(int position) {
        //建立指望的 ViewHolder
        return new ViewHolder();
    }
    
    class ViewHolder extends BaseViewHolder<Object> {
        Button btn1, btn2, btn3;

        @Override
        protected void onCreate(Context context, ViewGroup parent) {
            //ViewHolder建立後onCreate會被執行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的時候onDataChanged會被執行一次
            btn1.setText("add " + position);
            btn2.setText("update " + position);
            btn3.setText("delete " + position);
            //
            bindClick(btn1, position, CLICK_ACTION_ADD);//綁定ItemClick，每次都需bind
            bindClick(btn2, position, CLICK_ACTION_UPDATE);
            bindClick(btn3, position, CLICK_ACTION_DELETE);
        }
    }

}

2,Adapter使用

//數據源    
 private final ArrayList<Object> mData = new ArrayList<>();
 //建立Adapter並綁定數據源
 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);
     //綁定Adapter
     mListView.setAdapter(mAdapter);
     //設置click listener（因爲CommonAdapter支持，並經過bindClick聲明）
     mAdapter.setOnItemClickListener(onItemClickListener);
 }

 //ClickListener實現
 private OnItemClickListener onItemClickListener = new OnItemClickListener() {
     @Override
     public void onItemClick(CommonAdapter<?> adapter, View v, int position, int action) {
         switch (action) {//action就是咱們SampleHolderAdapte中定義而且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;
         }
     }
 };

到此定義和使用的代碼完畢。