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Android开发中总结的Adapter工具类【附完整源码下载】

2019-10-22 18:22:40
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本文实例讲述了Android开发中总结的Adapter工具类。分享给大家供大家参考,具体如下:

Adapter是连接后端数据和前端显示的适配器接口,是数据和UI(View)之间一个重要的纽带。在常见的View(ListView,GridView)等地方都需要用到Adapter。

每个开发工程师都会有自己的一些常用到的工具类,今天我分享一下我自己总结的关于Adapter的工具类,话不多说直接上代码

CommonAdapter:

public abstract class CommonAdapter<T> extends BaseAdapter{  protected LayoutInflater mInflater;  protected Context mContext;  protected List<T> mDatas;  protected final int mItemLayoutId;  public CommonAdapter(Context context, List<T> mDatas, int itemLayoutId)  {    this.mContext = context;    this.mInflater = LayoutInflater.from(mContext);    this.mDatas = mDatas;    this.mItemLayoutId = itemLayoutId;  }  @Override  public int getCount()  {    return mDatas.size();  }  @Override  public T getItem(int position)  {    return mDatas.get(position);  }  @Override  public long getItemId(int position)  {    return position;  }  @Override  public View getView(int position, View convertView, ViewGroup parent)  {    final ViewHolder viewHolder = getViewHolder(position, convertView,        parent);    convert(viewHolder, getItem(position) , position);    return viewHolder.getConvertView();  }  public abstract void convert(ViewHolder helper, T item , int postion);  private ViewHolder getViewHolder(int position, View convertView,      ViewGroup parent)  {    return ViewHolder.get(mContext, convertView, parent, mItemLayoutId,        position);  }}

ViewHolder:

public class ViewHolder{  private final SparseArray<View> mViews;  private int mPosition;  private View mConvertView;  private ViewHolder(Context context, ViewGroup parent, int layoutId,      int position)  {    this.mPosition = position;    this.mViews = new SparseArray<View>();    mConvertView = LayoutInflater.from(context).inflate(layoutId, parent,        false);    // setTag    mConvertView.setTag(this);  }  /**   * 拿到ViewHolder对象   *   * @param context   * @param convertView   * @param parent   * @param layoutId   * @param position   * @return   */  public static ViewHolder get(Context context, View convertView,      ViewGroup parent, int layoutId, int position)  {    ViewHolder holder = null;    if (convertView == null)    {      holder = new ViewHolder(context, parent, layoutId, position);    } else    {      holder = (ViewHolder) convertView.getTag();      holder.mPosition = position;    }    return holder;  }  public View getConvertView()  {    return mConvertView;  }  /**   * 通过控件的Id获取对于的控件,如果没有则加入views   *   * @param viewId   * @return   */  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;  }  /**   * 为TextView设置字符串   *   * @param viewId   * @param text   * @return   */  public ViewHolder setText(int viewId, String text)  {    TextView view = getView(viewId);    view.setText(text);    return this;  }  /**   * 为ImageView设置图片   *   * @param viewId   * @param drawableId   * @return   */  public ViewHolder setImageResource(int viewId, int drawableId)  {    ImageView view = getView(viewId);    view.setImageResource(drawableId);    return this;  }  /**   * 为ImageView设置图片   *   * @param viewId   * @param drawableId   * @return   */  public ViewHolder setImageBitmap(int viewId, Bitmap bm)  {    ImageView view = getView(viewId);    view.setImageBitmap(bm);    return this;  }  /**   * 通过图片路径为ImageView设置图片   * @param viewId   * @param drawableId   * @return   */  public ViewHolder setImageByUrl(int viewId, String url)  {    ImageLoader.getInstance(3,Type.LIFO).loadImage(url, (ImageView) getView(viewId));    return this;  }  public int getPosition()  {    return mPosition;  }}

MyAdapter:

public class MyAdapter extends CommonAdapter<String>{  private List<String> mData ;  public MyAdapter(Context context, List<String> mDatas, int itemLayoutId)  {    super(context, mDatas, itemLayoutId);    this.mDatas = mDatas ;  }  @Override  public void convert(final ViewHolder helper, final String item , int postion)  {    /**     * 第一种     */    helper.setImageResource(R.id.item_ib01, R.drawable.ic_launcher);    helper.setImageResource(R.id.item_iv01,        R.drawable.ic_launcher);    helper.setText(R.id.item_tv01, "我是第"+mDatas.get(postion)+"个") ;    // 通过路径设置图片//   helper.setImageByUrl(R.id.id_item_image, mDirPath + "/" + item);  /*   * 第二种   */    /*     *    final ImageView item_iv = helper.getView(R.id.item_iv01);    final ImageButton item_ib = helper.getView(R.id.item_ib01);    TextView item_tv = helper.getView(R.id.item_tv01) ;    item_tv.setText("我是第"+mDatas.get(postion)+"个") ;    item_iv.setImageResource(R.drawable.ic_launcher);    item_ib.setColorFilter(Color.parseColor("#77000000"));     */  }}

附:完整实例代码点击此处本站下载

PS:该下载源码包含了eclipse与studio两个压缩包。

希望本文所述对大家Android程序设计有所帮助。


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