Android中的Adapter封装

骑猪看日落 2022-08-22 00:14 202阅读 0赞

[转载请注明出处：http://blog.csdn.net/zhanjixun/article/details/51346305][http_blog.csdn.net_zhanjixun_article_details_51346305]

在Android开发中经常会用到Adapter，经常要实现一大堆方法。为了简化开发，不多做一些简单繁琐的工作，我对Adapter进行了封装。

/**
     * 要先在构造函数中调用setLayoutId()设置布局文件
     * 
     * @author zhanjixun
     *
     * @param <T>
     */
    public abstract class EasyAdapter<T> extends BaseAdapter {
    
    	protected List<T> mList = new LinkedList<T>();
    	protected Context mContext;
    	protected int mLayoutId;
    
    	public EasyAdapter(Context context, List<T> list) {
    		mContext = context;
    		mList = list;
    	}
    
    	/**
    	 * 获取适配器的数据
    	 * 
    	 * @return
    	 */
    	public List<T> getList() {
    		return mList;
    	}
    
    	/**
    	 * 单个添加数据
    	 * 
    	 * @param item
    	 */
    	public void add(T item) {
    		mList.add(item);
    		notifyDataSetChanged();
    	}
    
    	/**
    	 * 追加数据
    	 * 
    	 * @param list
    	 */
    	public void append(List<T> list) {
    		mList.addAll(list);
    		notifyDataSetChanged();
    	}
    
    	/**
    	 * 替换数据,不关联参数的List
    	 * 
    	 * @param list
    	 */
    	public void replace(List<T> list) {
    		mList.clear();
    		mList.addAll(list);
    		notifyDataSetChanged();
    	}
    
    	/**
    	 * 清空数据
    	 */
    	public void clear() {
    		mList.clear();
    		notifyDataSetChanged();
    	}
    
    	@Override
    	public int getCount() {
    		return mList.size();
    	}
    
    	@Override
    	public T getItem(int position) {
    		return mList.get(position);
    	}
    
    	@Override
    	public long getItemId(int position) {
    		return position;
    	}
    
    	public Context getContext() {
    		return mContext;
    	}
    
    	public int getLayoutId() {
    		return mLayoutId;
    	}
    
    	protected void setLayoutId(int layoutId) {
    		mLayoutId = layoutId;
    	}
    
    	@Override
    	public View getView(int position, View convertView, ViewGroup parent) {
    
    		ViewHolder holder = null;
    
    		if (convertView == null) {
    			View view = convertView = View.inflate(mContext, mLayoutId, null);
    			holder = new ViewHolder(view);
    			view.setTag(holder);
    		} else {
    			holder = (ViewHolder) convertView.getTag();
    		}
    		// 填充信息
    		convert(position, holder, getItem(position));
    
    		return holder.getConvertView();
    	}
    
    	protected abstract void convert(int position, ViewHolder holder, T item);
    
    }

其中用到的ViewHolder是用来保存重用的view的，可以在这里设置特定的item的数据

代码如下：（其中除了一大堆常用的view的api之外，关键代码在前面几个方法，构造函数ViewHolder（View）通过传入一个View来持有这个View，findViewById，通过id定位子控件）

/**
     * view持有
     * 
     * @author zhanjixun
     *
     */
    public class ViewHolder {
    
    	private final SparseArray<View> mViews = new SparseArray<View>();
    
    	private View mConvertView;
    
    	public ViewHolder(View v) {
    		mConvertView = v;
    	}
    
    	/**
    	 * 通过viewId获取控件
    	 * 
    	 * @param viewId
    	 * @return
    	 */
    	@SuppressWarnings("unchecked")
    	public <T extends View> T findViewById(int viewId) {
    		View view = mViews.get(viewId);
    		if (view == null) {
    			view = mConvertView.findViewById(viewId);
    			mViews.put(viewId, view);
    		}
    		return (T) view;
    	}
    
    	/**
    	 * 得到持有的View
    	 * 
    	 * @return
    	 */
    	public View getConvertView() {
    		return mConvertView;
    	}
    
    	public ViewHolder setText(int viewId, String text) {
    		TextView tv = findViewById(viewId);
    		tv.setText(text);
    		return this;
    	}
    
    	public ViewHolder setImageResource(int viewId, int resId) {
    		ImageView view = findViewById(viewId);
    		view.setImageResource(resId);
    		return this;
    	}
    
    	public ViewHolder setImageBitmap(int viewId, Bitmap bitmap) {
    		ImageView view = findViewById(viewId);
    		view.setImageBitmap(bitmap);
    		return this;
    	}
    
    	public ViewHolder setImageDrawable(int viewId, Drawable drawable) {
    		ImageView view = findViewById(viewId);
    		view.setImageDrawable(drawable);
    		return this;
    	}
    
    	public ViewHolder setBackgroundColor(int viewId, int color) {
    		View view = findViewById(viewId);
    		view.setBackgroundColor(color);
    		return this;
    	}
    
    	public ViewHolder setBackgroundResource(int viewId, int backgroundRes) {
    		View view = findViewById(viewId);
    		view.setBackgroundResource(backgroundRes);
    		return this;
    	}
    
    	public ViewHolder setTextColor(int viewId, int textColor) {
    		TextView view = findViewById(viewId);
    		view.setTextColor(textColor);
    		return this;
    	}
    
    	public ViewHolder setTextColorResource(int viewId, int textColorRes) {
    		TextView view = findViewById(viewId);
    		Resources resources = mConvertView.getContext().getResources();
    		view.setTextColor(resources.getColor(textColorRes));
    		return this;
    	}
    
    	public ViewHolder setVisibility(int viewId, int visible) {
    		View view = findViewById(viewId);
    		view.setVisibility(visible);
    		return this;
    	}
    
    	public ViewHolder setProgress(int viewId, int progress) {
    		ProgressBar view = findViewById(viewId);
    		view.setProgress(progress);
    		return this;
    	}
    
    	public ViewHolder setProgress(int viewId, int progress, int max) {
    		ProgressBar view = findViewById(viewId);
    		view.setMax(max);
    		view.setProgress(progress);
    		return this;
    	}
    
    	public ViewHolder setProgressMax(int viewId, int max) {
    		ProgressBar view = findViewById(viewId);
    		view.setMax(max);
    		return this;
    	}
    
    	public ViewHolder setRating(int viewId, float rating) {
    		RatingBar view = findViewById(viewId);
    		view.setRating(rating);
    		return this;
    	}
    
    	public ViewHolder setRating(int viewId, float rating, int max) {
    		RatingBar view = findViewById(viewId);
    		view.setMax(max);
    		view.setRating(rating);
    		return this;
    	}
    
    	public ViewHolder setTag(int viewId, Object tag) {
    		View view = findViewById(viewId);
    		view.setTag(tag);
    		return this;
    	}
    
    	public ViewHolder setTag(int viewId, int key, Object tag) {
    		View view = findViewById(viewId);
    		view.setTag(key, tag);
    		return this;
    	}
    
    	public ViewHolder setChecked(int viewId, boolean checked) {
    		Checkable view = (Checkable) findViewById(viewId);
    		view.setChecked(checked);
    		return this;
    	}
    
    	public ViewHolder setOnClickListener(int viewId,
    			View.OnClickListener listener) {
    		View view = findViewById(viewId);
    		view.setOnClickListener(listener);
    		return this;
    	}
    
    	public ViewHolder setOnTouchListener(int viewId,
    			View.OnTouchListener listener) {
    		View view = findViewById(viewId);
    		view.setOnTouchListener(listener);
    		return this;
    	}
    
    	public ViewHolder setOnLongClickListener(int viewId,
    			View.OnLongClickListener listener) {
    		View view = findViewById(viewId);
    		view.setOnLongClickListener(listener);
    		return this;
    	}
    }

使用方法：

写一个类直接继承EasyAdapter声明的泛型为你要处理的数据的类型，然后实现convert方法处理数据的绑定

public class ListViewAdapter extends EasyAdapter<String> {
    
    	public ListViewAdapter(Context context, List<String> list) {
    		super(context, list);
    		setLayoutId(R.layout.item_listview);
    	}
    
    	@Override
    	public void convert(int position, ViewHolder holder, String item) {
    		super.convert(position, holder, item);
    		holder.setText(R.id.mainTextView, item);
    	}
    
    }

源代码：因为基本上的代码都在上面了，看懂的都能直接用了，这里就不提供项目代码了

[http_blog.csdn.net_zhanjixun_article_details_51346305]: http://blog.csdn.net/zhanjixun/article/details/51346305