TabLayout和ViewPager实现联动效果以及Pulltorefresh
先上效果图
接下来就是主视图 xml视图
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabIndicatorColor="@color/red"
app:tabMode="scrollable"
app:tabSelectedTextColor="@color/red"
app:tabTextColor="@color/black"/>
<android.support.v4.view.ViewPager
android:id="@+id/vp_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
LinearLayout>
接下来是MyActivity里的视图
public class MainActivity extends AppCompatActivity {
private TabLayout mTabLayout;
private ViewPager mViewPager;
private String[] channels = {"推荐","热点","体育","娱乐","社会","汽车","教育","财经","科技","游戏"};
private String[] Urls={
"http://gank.io/api/data/Android/10/1",
"http://gank.io/api/data/Android/10/1",
"http://gank.io/api/data/Android/10/1",
"http://gank.io/api/data/Android/10/1",
"http://gank.io/api/data/Android/10/1",
"http://gank.io/api/data/Android/10/1",
"http://gank.io/api/data/Android/10/1",
"http://gank.io/api/data/Android/10/1",
"http://gank.io/api/data/Android/10/1",
"http://gank.io/api/data/Android/10/1",
};
private LayoutInflater mInflater;
private List mViewList=new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTabLayout = (TabLayout) findViewById(R.id.tabs);
mViewPager = (ViewPager) findViewById(R.id.vp_view);
mInflater = LayoutInflater.from(this);
for (int i = 0; i < channels.length; i++) {
//创建栏目的fragment
ChannelFragment fragment = new ChannelFragment();
Bundle b = new Bundle();
b.putString("name", channels[i]);//传递名字
b.putString("url", Urls[i]);
fragment.setArguments(b);
//收集fragment
mViewList.add(fragment);
//给tablayout添加tab选项卡
mTabLayout.addTab(mTabLayout.newTab().setText(channels[i]));//添加tab选项卡
}
FragmentManager fm = getSupportFragmentManager();
MyFragmentPagerAdapter adapter=new MyFragmentPagerAdapter(fm,mViewList);
mViewPager.setAdapter(adapter);//关联适配器
mTabLayout.setupWithViewPager(mViewPager);//将Tablayout与Viewpager建立连接
}
class MyFragmentPagerAdapter extends FragmentPagerAdapter {
private List mViewList;
public MyFragmentPagerAdapter(FragmentManager fm, List mViewList) {
super(fm);
this.mViewList = mViewList;
}
@Override
public Fragment getItem(int position) {
return mViewList.get(position);
}
@Override
public int getCount() {
return mViewList.size();
}
@Override
public CharSequence getPageTitle(int position) {
return channels[position];//页卡标题
}
}
}
然后为上拉加载下拉刷新创建视图
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<com.handmark.pulltorefresh.library.PullToRefreshListView
xmlns:ptr="http://schemas.android.com/apk/res-auto"
android:id="@+id/pull_refresh_list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:cacheColorHint="#000000"
android:divider="#19000000"
android:dividerHeight="4dp"
android:fadingEdge="none"
android:fastScrollEnabled="false"
android:footerDividersEnabled="false"
android:headerDividersEnabled="false"
android:smoothScrollbar="true"
ptr:ptrAnimationStyle="rotate"
ptr:ptrHeaderTextColor="#ffffff"
ptr:ptrHeaderSubTextColor="#00ffff"
ptr:ptrHeaderBackground="@null"
ptr:ptrDrawable="@mipmap/ic_launcher"/>
LinearLayout>
多条目一的视图
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/image"
android:layout_width="60dp"
android:layout_height="60dp" />
<TextView
android:id="@+id/text"
android:textSize="20sp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
LinearLayout>
多条目二的视图
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/text2"
android:textSize="20sp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
LinearLayout>
ChannelFreament的类 建立导航栏
public class ChannelFragment extends Fragment{
private String name;
private String news_url;
private PullToRefreshListView pullToRefreshListView;
private List results;
private PullOnRefreshAdapter adapter;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//接受传过来的值
Bundle bundle = getArguments();
name = (String) bundle.get("name");
news_url = (String) bundle.get("url");
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.fragment,null);
//获取资源ID
pullToRefreshListView=(PullToRefreshListView) view.findViewById(R.id.pull_refresh_list);
pullToRefreshData();
//刷新
pullToRefreshListView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener() {
@Override
public void onRefresh(PullToRefreshBase refreshView) {
pullToRefreshData();
}
});
//加载
pullToRefreshListView.setOnLastItemVisibleListener(new PullToRefreshBase.OnLastItemVisibleListener() {
@Override
public void onLastItemVisible() {
LoadMoreData();
}
});
return view;
}
//刷新
public void pullToRefreshData(){
new AsyncTask(){
@Override
protected String doInBackground(String... strings) {
//解析
String str=new NetWorksUtils().getJsonUrlJiexi(news_url+"1");
return str;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Gson gson = new Gson();
User user = gson.fromJson(s, User.class);
results = user.getResults();
//关联适配器
adapter=new PullOnRefreshAdapter(results,getActivity());
pullToRefreshListView.setAdapter(adapter);
//停止刷新
pullToRefreshListView.onRefreshComplete();
}
}.execute(news_url);
}
//加载
public void LoadMoreData(){
new AsyncTask(){
@Override
protected String doInBackground(String... strings) {
//解析
String str=new NetWorksUtils().getJsonUrlJiexi(news_url+"1");
return str;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Gson gson = new Gson();
User user = gson.fromJson(s, User.class);
//新集合
List results2 = user.getResults();
//上拉添加一遍
results.addAll(results2);
//刷新适配器
adapter.notifyDataSetChanged();
}
}.execute(news_url);
}
}
上拉下拉的适配器
public class PullOnRefreshAdapter extends BaseAdapter{
private List list;
private Context context;
public PullOnRefreshAdapter(List list, Context context) {
this.list = list;
this.context = context;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int i) {
return list.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public int getViewTypeCount() {
return 2;
}
//多条目
@Override
public int getItemViewType(int position) {
int rs=0;
if(list.get(position).getImages()==null){
rs=0;
}else if (list.get(position).getImages()!=null){
rs=1;
}
return rs;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
int rs=getItemViewType(i);
//等于1有图片展示
if(rs==1){
view=View.inflate(context, R.layout.item,null);
ImageView imageView=(ImageView) view.findViewById(R.id.image);
TextView textView=(TextView) view.findViewById(R.id.text);
textView.setText(list.get(i).getDesc()+"\n"+list.get(i).getCreatedAt());
ImageLoader.getInstance().displayImage(list.get(i).getImages().get(0),imageView);
}else if (rs==0){//等于0没有图片
view=View.inflate(context, R.layout.item2,null);
TextView textView2=(TextView) view.findViewById(R.id.text2);
textView2.setText(list.get(i).getDesc()+"\n"+list.get(i).getCreatedAt());
}
return view;
}
}
加载图片的工具类
public class MyApp extends Application{
@Override
public void onCreate() {
super.onCreate();
//默认加载图片
ImageLoaderConfiguration configuration=ImageLoaderConfiguration.createDefault(this);
ImageLoader.getInstance().init(configuration);
}
}
解析网络数据的工具类
public class NetWorksUtils { //解析的方法 public String getJsonUrlJiexi(String jsonStr){ URL url=null; HttpURLConnection httpURLConnection=null; String JsonUrl=""; try { //进行网络解析 url=new URL(jsonStr); httpURLConnection= (HttpURLConnection) url.openConnection(); httpURLConnection.setConnectTimeout(5000); httpURLConnection.setReadTimeout(5000); //获取响应码 int responseCode = httpURLConnection.getResponseCode(); if (responseCode==200){ InputStream inputStream = httpURLConnection.getInputStream(); byte[] bytes = new byte[1024]; int i=0; while ((i=inputStream.read(bytes))!=-1){ JsonUrl +=new String(bytes,0,i); } } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return JsonUrl; } }