自定义Recycerview支持多种类型，下拉刷新，上拉加载更多的适配器

于 2016-10-25 20:34:40 发布
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本文链接：https://blog.csdn.net/AndroidFlying007/article/details/52926880
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本文介绍了一个基于Android的自定义RecyclerView适配器实现方法，包括不同类型的视图展示及下拉刷新、加载更多的功能实现。

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项目地址https://github.com/helloworld107/ZhNews
public class DailyListAdapter extends RecyclerView.Adapter {

private Context mContext ;
private Response mResponse ;
public int load_state = LOAD_PULL_TO ;

// 专门用来处理尾部刷新状态的标识，跟适配器类型无关
public static final int LOAD_MORE = 0 ;
public static final int LOAD_PULL_TO = 1 ;
public static final int LOAD_NONE = 2 ;
public static final int LOAD_END = 3 ;

//轮播图和请求尾部算一个吧
private static final int TYPE_TOP = - 1 ;
private static final int TYPE_FOOTER = - 2 ;

//列表中间的四种类型，其实只有三种类型，空类星可以不写，切记类似数字最好想回递增不要乱写
private static final int TYPE_HEADLINE = - 3 ;
private static final int TYPE_NORMAL_PICTURE = - 4 ;
private static final int TYPE_NORMAL_TEXT = - 5 ;
private static final int TYPE_EMPTY = - 6 ;

public DailyListAdapter(Context context, Response response) {
mContext = context;
this . mResponse = response;
}

@Override
public int getItemViewType( int position) {

// 弄了半天只判断头和尾啊
if (position == 0 ) {
return TYPE_TOP ;
} else if (position == 1 ) {
return TYPE_HEADLINE ;
} else if (position + 1 == getItemCount()) {
return TYPE_FOOTER ;
} else {
// 普通类型又分三种情况
Daily daily = mResponse .getFeeds().get(position - 2 );
int type = daily.getType();
if (type == 0 || type == 2 ) {
return TYPE_NORMAL_PICTURE ;
} else if (type == 1 ) {
return TYPE_NORMAL_TEXT ;
} else {
return TYPE_EMPTY ;
}
}
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
// Logger.e("viewType " + viewType);
// Logger.e("count " + getItemCount());
switch (viewType) {
case TYPE_TOP :
View inflate1 = View. inflate ( mContext , R.layout. item_zhihu_top_stories , null );
TopStoriesViewHolder topStoriesViewHolder = new TopStoriesViewHolder(inflate1);
return topStoriesViewHolder;
case TYPE_FOOTER :
View inflate2 = View. inflate ( mContext , R.layout. activity_view_footer , null );
FooterViewHolder footerViewHolder = new FooterViewHolder(inflate2);
return footerViewHolder;
case TYPE_HEADLINE :
View rootView = View. inflate (parent.getContext(), R.layout. item_daily_headline , null );
return new HeadlineViewHolder(rootView);
case TYPE_NORMAL_PICTURE :
View rootView1 = View. inflate (parent.getContext(), R.layout. item_daily_feed_0 , null );
return new Feed_0_ViewHolder(rootView1);
case TYPE_NORMAL_TEXT :
View rootView2 = View. inflate (parent.getContext(), R.layout. item_daily_feed_1 , null );
return new Feed_1_ViewHolder(rootView2);
case TYPE_EMPTY : // 不实现
View rootView3 = View. inflate (parent.getContext(), R.layout. item_empty , null );
return new EmptyViewHolder(rootView3);
}
View rootView3 = View. inflate (parent.getContext(), R.layout. item_empty , null );
return new EmptyViewHolder(rootView3);
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

// getItemViewType(position) // 可以通过这种方法判断类型，不过还有中更加简单的方式
if (holder instanceof DailyListAdapter.FooterViewHolder) {
DailyListAdapter.FooterViewHolder footerViewHolder = (DailyListAdapter.FooterViewHolder) holder;
//封装方法写在了 holder 里，6666
footerViewHolder.bindItem();
} else if (holder instanceof DailyListAdapter.TopStoriesViewHolder) {
DailyListAdapter.TopStoriesViewHolder topStoriesViewHolder = (DailyListAdapter.TopStoriesViewHolder) holder;
topStoriesViewHolder.bindItem( mResponse .getBanners());
} else if (holder instanceof Feed_1_ViewHolder) {
Daily daily = mResponse .getFeeds().get(position - 2 );
// 由于数据的原因，必须判断类型，如果没有类型就不设数据，好坑爹啊，服务器又干什么坏事了
Feed_1_ViewHolder feed1viewholder = (Feed_1_ViewHolder) holder;
feed1viewholder.bindItem(daily);
} else if (holder instanceof Feed_0_ViewHolder) {
Daily daily = mResponse .getFeeds().get(position - 2 );
Feed_0_ViewHolder feed0viewholder = (Feed_0_ViewHolder) holder;
feed0viewholder.bindItem(daily);
} else if (holder instanceof HeadlineViewHolder) {
HeadlineViewHolder headlineViewHolder = (HeadlineViewHolder) holder;
headlineViewHolder.bindItem( mResponse .getHeadline());
} else {

}
}

@Override
public int getItemCount() {
return mResponse .getListSize() + 1 ; //请求头和headline已经帮你加好了，所以再一个请求尾部就可以了，这个比较灵活，要根据实际情况考虑
}

// 写这两个方法就是为了开启轮播图功能而已，轮不图是个自定义控件，用起来还不错
@Override
public void onView AttachedToWindow(RecyclerView.ViewHolder holder) {
if (holder instanceof ZhihuListAdapter.TopStoriesViewHolder) {
ZhihuListAdapter.TopStoriesViewHolder topStoriesViewHolder = (ZhihuListAdapter.TopStoriesViewHolder) holder;
topStoriesViewHolder. mVpTopStories .startAutoRun();
}
}

@Override
public void onViewDetachedFromWindow(RecyclerView.ViewHolder holder) {
if (holder instanceof ZhihuListAdapter.TopStoriesViewHolder) {
ZhihuListAdapter.TopStoriesViewHolder topStoriesViewHolder = (ZhihuListAdapter.TopStoriesViewHolder) holder;
topStoriesViewHolder. mVpTopStories .stopAutoRun();
}
}


class TopStoriesViewHolder extends RecyclerView.ViewHolder {
@Bind (R.id. vp_top_stories )
TopStoriesViewPager mVpTopStories ;
@Bind (R.id. tv_top_title )
TextView mTvTopTitle ;

TopStoriesViewHolder(View view) {
super (view);
ButterKnife. bind ( this , view);
}

public void bindItem(List<Daily> banners) {
// 因为轮播图的类型写死了，所以需要转换一下，好坑爹，应该定义成泛型
List<TopStories> topList = new ArrayList<>();
for (Daily d : banners) {
TopStories t = new TopStories();
t.setImage(d.getImage());
t.setTitle(d.getPost().getTitle());
t.setUrl(d.getPost().getAppview());
topList.add(t);
}
mVpTopStories .init(topList, mTvTopTitle , new TopStoriesViewPager.ViewPagerClickListenner() {
@Override
public void onClick(TopStories item) {
mContext .startActivity(GankWebActivity. newIntent ( mContext ,item.getUrl()));
}
});

}
}

class FooterViewHolder extends RecyclerView.ViewHolder {

@Bind (R.id. progress )
ProgressBar mProgress ;
@Bind (R.id. tv_load_prompt )
TextView mTvLoadPrompt ;

FooterViewHolder(View view) {
super (view);
ButterKnife. bind ( this , view);
// 宽度好定，高度麻烦，根据屏幕适配方法用代码写一下，这个方法值得赞一下
ScreenUtil instance = ScreenUtil. instance ( mContext );
int height = instance.dip2px( 40 );
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams. MATCH_PARENT , height);
view.setLayoutParams(layoutParams);

}

public void bindItem() {
// 请求尾部都在这里处理了，其实也不难
switch ( load_state ) {
case LOAD_MORE :
mTvLoadPrompt .setText( " 正在加载中。。。 " );
mProgress .setVisibility(View. VISIBLE );
break ;
case LOAD_PULL_TO :
mTvLoadPrompt .setText( " 上拉加载更多 " );
mProgress .setVisibility(View. VISIBLE );
break ;
case LOAD_NONE :
mTvLoadPrompt .setText( " 已无更多数据 " );
mProgress .setVisibility(View. GONE );
break ;
case LOAD_END :
mProgress .setVisibility(View. GONE );
break ;
}
}
}
// 提供给外部更新下拉进度条的装
public void updateLoadStatus( int status) {
this . load_state = status;
notifyDataSetChanged();
}

class Feed_1_ViewHolder extends RecyclerView.ViewHolder {

@Bind (R.id. tv_feed_1_title )
TextView tv_feed_1_title ;
@Bind (R.id. tv_feed_1_type )
TextView tv_feed_1_type ;
@Bind (R.id. iv_feed_1_type_icon )
ImageView iv_feed_1_type_icon ;
@Bind (R.id. iv_feed_1_icon )
ImageView iv_feed_1_icon ;
@Bind (R.id. card_feed_1 )
CardView card_feed_1 ;

public Feed_1_ViewHolder(View itemView) {
super (itemView);
ButterKnife. bind ( this , itemView);

ScreenUtil screenUtil = ScreenUtil. instance ( mContext );
// 这种适配方法值得学习
card_feed_1 .setLayoutParams( new LinearLayout.LayoutParams(screenUtil.getScreenWidth(), ViewGroup.LayoutParams. WRAP_CONTENT ));
}

public void bindItem(Daily daily) {
tv_feed_1_title .setText(daily.getPost().getTitle());
tv_feed_1_type .setText(daily.getPost().getCategory().getTitle());
Glide. with ( mContext ).load(daily.getPost().getCategory().getImage_lab()).centerCrop().into( iv_feed_1_type_icon );
Glide. with ( mContext ).load(daily.getImage()).centerCrop().into( iv_feed_1_icon );

card_feed_1 .setOnClickListener(v -> {
mContext .startActivity(GankWebActivity. newIntent ( mContext , daily.getPost().getAppview()));

});
}


}


class EmptyViewHolder extends RecyclerView.ViewHolder {

public EmptyViewHolder(View rootView) {
super (rootView);
}
}

class Feed_0_ViewHolder extends RecyclerView.ViewHolder {

@Bind (R.id. iv_feed_0_icon )
ImageView iv_feed_0_icon ;
@Bind (R.id. tv_feed_0_title )
TextView tv_feed_0_title ;
@Bind (R.id. tv_feed_0_desc )
TextView tv_feed_0_desc ;
@Bind (R.id. iv_feed_0_type )
ImageView iv_feed_0_type ;
@Bind (R.id. tv_Feed_0_type )
TextView tv_Feed_0_type ;
@Bind (R.id. card_layout )
CardView card_layout ;

public Feed_0_ViewHolder(View itemView) {
super (itemView);
ButterKnife. bind ( this , itemView);

ScreenUtil screenUtil = ScreenUtil. instance ( mContext );
card_layout .setLayoutParams( new LinearLayout.LayoutParams(screenUtil.getScreenWidth(), ViewGroup.LayoutParams. WRAP_CONTENT ));
}

public void bindItem(Daily daily) {
tv_feed_0_title .setText(daily.getPost().getTitle());
tv_feed_0_desc .setText(daily.getPost().getDescription());
tv_Feed_0_type .setText(daily.getPost().getCategory().getTitle());
Glide. with ( mContext ).load(daily.getImage()).centerCrop().into( iv_feed_0_icon );

if (daily.getType() == 0 ) {
Glide. with ( mContext ).load(R.drawable. feed_0_icon ).centerCrop().into( iv_feed_0_type );
card_layout .setOnClickListener(v -> {
Intent intent = DailyFeedActivity. newIntent ( mContext , daily.getPost().getId(), daily.getPost().getDescription(), daily.getPost().getTitle(), daily.getImage());
mContext .startActivity(intent);
});
} else if (daily.getType() == 2 ) {

Glide. with ( mContext ).load(R.drawable. feed_1_icon ).centerCrop().into( iv_feed_0_type );
card_layout .setOnClickListener(v -> {
Intent intent = GankWebActivity. newIntent ( mContext , daily.getPost().getAppview());
mContext .startActivity(intent);
});
}


}
}

class HeadlineViewHolder extends RecyclerView.ViewHolder {

@Bind (R.id. tv_headline_1 )
TextView tv_headline_1 ;
@Bind (R.id. tv_headline_2 )
TextView tv_headline_2 ;
@Bind (R.id. tv_headline_3 )
TextView tv_headline_3 ;
@Bind (R.id. card_headline )
CardView card_headline ;

public HeadlineViewHolder(View itemView) {
super (itemView);
ButterKnife. bind ( this , itemView);
}

public void bindItem(Daily daily) {
List<HeadLine> headLines = daily.getList();
tv_headline_1 .setText(headLines.get( 0 ).getDescription());
tv_headline_2 .setText(headLines.get( 1 ).getDescription());
tv_headline_3 .setText(headLines.get( 2 ).getDescription());

card_headline .setOnClickListener(v -> {
mContext .startActivity(GankWebActivity. newIntent ( mContext , daily.getPost().getAppview()));

});
}
}

}
总而言之写法中规中矩吧，其实更好的写法应该把轮播图和请求尾部改成listview那样的可以动态添加头和尾这样就更好的实现了分类，开源控件很多，这里就不多说了，下拉刷新交给了布局swiperefresh的去完成了
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