Android开发各种Adapter的用法

   ListView和GridView的Adapter:

1、继承BaseAdapter

2、新建Holder类声明控件

private class DiyHolder{        TextView tv_job;        ImageView iv_select_job;    }

3、覆写getView中做好converView重用，用converView.setTag(diyHolder)

4、如果用到getItemViewType()，一般是从数据中赋值确定的，getView方法就要根据type来判断后再设定converView.setTag(diyHolder)，一个type对应一个holder对象，

      取出来是也要根据type来判断。

示例代码，只给getView();

@Override    public View getView(final int position, View convertView, ViewGroup parent) {        final ListTopHolder mListTopHolder;                final CommentTitleHolder mCommentTitleHolder;        final TopicManagerListInfo topicManagerListInfo = mInfo.get(position);        final int type = getItemViewType(position);        if (convertView == null) {            if (type == TopicManagerListInfo.list_top) {                convertView=LayoutInflater.from(parent.getContext()).inflate(R.layout.topic_manager_top_layout,null);                ListTopHolder listTopHolder=new ListTopHolder();                listTopHolder.topic_banner_img=(ImageView) convertView.findViewById(R.id.topic_banner_img);                listTopHolder.topic_title=(TextView) convertView.findViewById(R.id.topic_title);                listTopHolder.topic_description=(TextView) convertView.findViewById(R.id.topic_description);                convertView.setTag(listTopHolder);                           }  else if (type == TopicManagerListInfo.user_title) {                convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.topic_manager_list_title_layout, null);                CommentTitleHolder commentTitleHolder = new CommentTitleHolder();                commentTitleHolder.comment_title_txt = (TextView) convertView.findViewById(R.id.comment_title_txt);                convertView.setTag(commentTitleHolder);            }        }        if (type == TopicManagerListInfo.list_top) {            mListTopHolder=(ListTopHolder) convertView.getTag();            //话题banner            if(topicManagerListInfo.getTopicBannerPath() != null && !topicManagerListInfo.getTopicBannerPath().isEmpty()){                String path=topicManagerListInfo.getTopicBannerPath();                mListTopHolder.topic_banner_img.setTag(path);                ImageCacheManager.loadImage(path,                        ImageCacheManager.getImageListener(mListTopHolder.topic_banner_img, mContext.getResources().getDrawable(R.drawable.avatar_default), mContext.getResources().getDrawable(R.drawable.avatar_default), path));                ImageCacheManager.getImageListener(mListTopHolder.topic_banner_img, mContext.getResources().getDrawable(R.drawable.avatar_default), mContext.getResources().getDrawable(R.drawable.avatar_default), path);                mListTopHolder.topic_banner_img.setVisibility(View.VISIBLE);            }else{                mListTopHolder.topic_banner_img.setVisibility(View.GONE);            }            //话题标题            mListTopHolder.topic_title.setText(topicManagerListInfo.getTopicTitle());            //话题描述            mListTopHolder.topic_description.setText(topicManagerListInfo.getTopicDescription());        }  else if (type == TopicManagerListInfo.user_title) {            mCommentTitleHolder = (CommentTitleHolder) convertView.getTag();            //标题            mCommentTitleHolder.comment_title_txt.setText("话题管理");            mCommentTitleHolder.comment_title_txt.setTextSize(14);        }        return convertView;    }

   RecyclerView的Adapter

1、首先要setLayoutManager()，比如：setLayoutManager(new LinearLayoutManager(mContext))，这里的setLayoutManager()大有文章，竖排列，横排列，两列或者多列

      都是有它来设置的。

2、继承RecyclerView.Adapter

3、DiyHolder需要继承RecyclerView.ViewHolder

4、onCreateViewHolder绑定布局item_layout

5、onBindViewHolder数据处理

整个Adapter的示例代码：

public class GreetWordsPreviewAdapter extends RecyclerView.Adapter{    private Context mContext;    private ArrayList<String> mInfo = new ArrayList<>();    public GreetWordsPreviewAdapter(Context mContext, ArrayList<String> mInfo) {        this.mContext = mContext;        this.mInfo = mInfo;    }    @Override    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View v = LayoutInflater.from(mContext).inflate(R.layout.item_greet_words_preview, parent, false);        DiyHolder holder = new DiyHolder(v);        return holder;    }    @Override    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {        String msg = mInfo.get(position);        if(holder instanceof DiyHolder){            DiyHolder diyHolder = (DiyHolder)holder;            ImageLoaderUtil.loadCircular(diyHolder.iv_head, Utils.getUser().getHead_img_small(), mContext);            diyHolder.tv_greet_word.setText(msg);        }    }    @Override    public long getItemId(int position) {        return 0;    }    @Override    public int getItemCount() {        return mInfo.size();    }    static class DiyHolder extends RecyclerView.ViewHolder {        @BindById(R.id.iv_head)        ImageView iv_head;        @BindById(R.id.tv_greet_word)        TextView tv_greet_word;        public DiyHolder(View view) {            super(view);            PreIOC.binder(this,view);        }    }}