ListView+BaseAdapter的使用

一、ListViewActivity 

/**
 * ListView+BaseAdapter
 */
public class ListViewActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
    private List<DataModel> models;
    private ListView mListView;
    private MyBaseAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list_view);
        initView();
    }

    private void initView() {
        getData();
        mListView = (ListView) findViewById(R.id.list_container);
        adapter = new MyBaseAdapter(this, models);
        mListView.setAdapter(adapter);
        mListView.setOnItemClickListener(this);
    }

    /**
     * 構模組化拟資料
     */
    private void getData() {
        models = new ArrayList<>();
        DataModel model;
        for (int i = 0; i < 20; i++) {
            model = new DataModel("清單标題" + i, "說明文字" + i);
            models.add(model);
        }
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

    }
}
           

二、MyBaseAdapter

/**
 * 自定義BaseAdapter
 * 包括四個成員方法和一個構造方法
 */
public class MyBaseAdapter extends BaseAdapter {
    private Context context;//内部類不用傳
    private List<DataModel> dataModels;
    private LayoutInflater mInflater;

    /**
     * 如果在内部實作，這兩個參數都可以不用傳的
     * @param context
     * @param dataModels
     */
    public MyBaseAdapter(Context context, List<DataModel> dataModels) {
        this.context = context;
        this.dataModels = dataModels;
        mInflater=LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return dataModels.size();
    }

    @Override
    public DataModel getItem(int position) {
        return dataModels.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View view, ViewGroup parent) {
        MyBaseViewHolder holder;
        if (view==null){
            view=mInflater.inflate(R.layout.item_data_model,null);
            holder=new MyBaseViewHolder(context,view);
            view.setTag(holder);
        }else{
            holder= (MyBaseViewHolder) view.getTag();
        }
        holder.setItem(getItem(position));
        holder.refreshView();
        return view;
    }
}
           

三、

/**
 * 适配BaseAdapter的ViewHolder
 * 包括三個方法：一個構造方法，一個stter和一個裝載資料的方法refreshView()
 * Created by Devin Chen on 2016/12/17.
 */

public class MyBaseViewHolder {
    private Context context;//内部類就不用，傳進來是以防萬一，例如Glide裝在圖檔就要用，内部做監聽也有可能要用
    //裝載資料的控件
    private ImageView icon;
    private TextView title, desc;
    private DataModel item;//封裝單挑資料的實體類

    /**
     * 構造方法：主要功能是執行個體化各個控件
     *
     * @param view 執行個體化的item布局檔案對象
     */
    public MyBaseViewHolder(Context context,View view) {
        this.context=context;
        icon = (ImageView) view.findViewById(R.id.img_icon);
        title = (TextView) view.findViewById(R.id.txt_title);
        desc = (TextView) view.findViewById(R.id.txt_desc);
    }

    public void setItem(DataModel item) {
        this.item = item;
    }

    /**
     * 裝載資料
     */
    public void refreshView(){
        icon.setImageResource(R.mipmap.ic_launcher);
        title.setText(item.getTitle());
        desc.setText(item.getDesc());
    }
}