本文共 6227 字，大约阅读时间需要 20 分钟。

目录

相关视频：

相关文章：

 （2015年03月02日）

（2014年08月28日）

代码：

ViewHolder.java

public class ViewHolder {    private SparseArray
   
     mViews;    private int mPosition;    private View mConvertView;    public ViewHolder(Context context, ViewGroup parent, int layoutId, int position) {        this.mPosition = position;        this.mViews = new SparseArray<>();        this.mConvertView = LayoutInflater.from(context).inflate(layoutId, parent, false);        mConvertView.setTag(this);    }    public static ViewHolder get(Context context, View convertView, ViewGroup parent, int layoutId,                                 int position) {        if (convertView == null) {            return new ViewHolder(context, parent, layoutId, position);        } else {            ViewHolder holder = (ViewHolder) convertView.getTag();            holder.mPosition = position;            return holder;        }    }    /**     * 通过viewId 获取控件     *     * @param viewId     * @param 
    
          * @return     */    public 
     
       T getView(int viewId) {        View view = mViews.get(viewId);        if (view == null) {            view = mConvertView.findViewById(viewId);            mViews.put(viewId, view);        }        return (T) view;    }    public View getConvertView() {        return mConvertView;    }    /**     * 设置TextView的值     */    public ViewHolder setText(@IdRes int viewId, String text) {        TextView tv = getView(viewId);        tv.setText(text);        return this;    }    public ViewHolder setText(@IdRes int viewId,@StringRes int strId) {        TextView tv = getView(viewId);        tv.setText(strId);        return this;    }    public ViewHolder setTextColor(@IdRes int viewId, @ColorInt int textColor) {        TextView view = (TextView)this.getView(viewId);        view.setTextColor(textColor);        return this;    }    /**     * 设置ImageView的值     */    public ViewHolder setImageResource(@IdRes int viewId, @DrawableRes int imageResId) {        ImageView view = this.getView(viewId);        view.setImageResource(imageResId);        return this;    }    public ViewHolder setImageDrawable(@IdRes int viewId, Drawable drawable) {        ImageView view = (ImageView)this.getView(viewId);        view.setImageDrawable(drawable);        return this;    }    public ViewHolder setImageBitmap(@IdRes int viewId, Bitmap bitmap) {        ImageView view = (ImageView)this.getView(viewId);        view.setImageBitmap(bitmap);        return this;    }    /**     * 背景属性     */    public ViewHolder setBackgroundColor(@IdRes int viewId, @ColorInt int color) {        View view = this.getView(viewId);        view.setBackgroundColor(color);        return this;    }    public ViewHolder setBackgroundRes(@IdRes int viewId, @DrawableRes int backgroundRes{        View view = this.getView(viewId);        view.setBackgroundResource(backgroundRes);        return this;    }    /**     * 隐藏、显示     */    public ViewHolder setGone(@IdRes int viewId, boolean visible) {        View view = this.getView(viewId);        view.setVisibility(visible?0:8);        return this;    }    public ViewHolder setVisible(@IdRes int viewId, boolean visible) {        View view = this.getView(viewId);        view.setVisibility(visible?0:4);        return this;    }}
     
    
   

CommonAdapter.java

public abstract class CommonAdapter
   
     extends BaseAdapter {    protected Context mContext;    protected List
    
      mDatas;    protected LayoutInflater mInflater;    public CommonAdapter(Context context, List
     
       datas) {        this.mContext = context;        mInflater = LayoutInflater.from(context);        this.mDatas = datas;    }    @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) {        ViewHolder holder = ViewHolder.get(mContext, convertView, parent, R.layout.item_list_view, position);        convert(holder, getItem(position));        return holder.getConvertView();    }    public abstract void convert(ViewHolder holder, T t);}
     
    
   

使用：

CommonAdapter
   
     adapter = new CommonAdapter
    
     (Test1Activity.this, mDatas) {            @Override            public void convert(ViewHolder holder, Bean bean) {                holder.setText(R.id.tv_title, bean.getTitle())                        .setText(R.id.tv_desc, bean.getDesc())                        .setText(R.id.tv_time, bean.getTime())                        .setText(R.id.tv_phone, bean.getPhone());            }        };        mListView.setAdapter(adapter);
    
   

或者：

public class MyAdapter2 extends CommonAdapter
   
     {    public MyAdapter2(Context context, List
    
      datas) {        super(context, datas);    }    @Override    public void convert(ViewHolder holder, Bean bean) {        holder.setText(R.id.tv_title, bean.getTitle())                .setText(R.id.tv_desc, bean.getDesc())                .setText(R.id.tv_time, bean.getTime())                .setText(R.id.tv_phone, bean.getPhone());//        ((TextView) holder.getView(R.id.tv_title)).setText(bean.getTitle());//        ((TextView) holder.getView(R.id.tv_desc)).setText(bean.getDesc());//        ((TextView) holder.getView(R.id.tv_time)).setText(bean.getTime());//        ((TextView) holder.getView(R.id.tv_phone)).setText(bean.getPhone());    }}
    
   

ListView常见问题：

1、Item控件抢占焦点：

例如，Item中有CheckBox控件，该控件就会导致Item触发不了点击事件。

为什么会出现焦点抢占的问题呢，可以从源码角度进行分析：

AbsListView --> onTouchEvent() --> MotionEvent.ACTION_UP:  --> 

if (inList && !child.hasExplicitFocusable()) {                    if (mPerformClick == null) {                        mPerformClick = new PerformClick();                    }                    final AbsListView.PerformClick performClick = mPerformClick;}

!child.hasExplicitFocusable() 可以看到只有在子空间没有获取焦点的时候事件才能往下传递。

2、ListView使用CheckBox会导致数据错乱问题，原因是数据复用。

解决办法一：在Bean中设置一个参数 private boolean isChecked; 用来实时记录CheckBox的checked状态。