Android之 RecyclerView，CardView 详解和相对应的上拉刷新下拉加载
随着 Google 推出了全新的设计语言 Material Design，还迎来了新的 Android 支持库 v7，其中就包含了 Material Design 设计语言中关于 Card 卡片概念的实现 —— CardView。RecyclerView也是谷歌V7包下新增的控件,用来替代ListView的使用,在RecyclerView标准化了ViewHolder类似于ListView中convertView用来做视图缓存.
RecyclerView的优点就是,他可以通过设置LayoutManager来快速实现listview、gridview、瀑布流的效果，而且还可以设置横向和纵向显示，添加动画效果等。
CardView实现卡片化效果。
下拉加载使用SwipeRefreshLayout，是官方的下拉刷新控件，简洁美观的风格使其广泛应用在项目中。美中不足的是SwipeRefreshLayout缺少上拉加载的效果，今天结合RecyclerView实现一个支持下拉刷新与上拉加载的SwipeRefreshLayout。
案例包含了：RecyclerView基本使用，RecyclerView上拉刷新下拉加载，RecyclerView多Item布局，CardView基本使用和CardView上拉刷新下拉加载。如图：（注：第三个案例线显示格式在模拟器上有问题，手机则没问题的,手机测试效果更佳）
布局：
<android.support.v7.widget.RecyclerView android:id="@+id/my_recycler_view" android:scrollbars="vertical" android:layout_width="match_parent" android:layout_height="match_parent"/>
Activity：
public class RecyclerViewActivity extends Activity { private RecyclerView recyclerView; private List<String> mDatas; private RecyclerAdapter1 adapter; @SuppressLint("InlinedApi") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.demo1); initData(); initView(); } private void initView() { recyclerView=(RecyclerView) findViewById(R.id.demo1_recycler); // 设置布局管理LayoutManager LinearLayoutManager manager=new LinearLayoutManager(this); //设置水平或者垂直 // manager.setOrientation(LinearLayoutManager.HORIZONTAL); recyclerView.setLayoutManager(manager); // （可选）如果可以确定每个item的高度是固定的，设置这个选项可以提高性能 recyclerView.setHasFixedSize(true); adapter=new RecyclerAdapter1(this,mDatas); recyclerView.setAdapter(adapter); adapter.setOnItemClickListener(new IOnClickListenter() { @Override public void onItemClick(View view, int position) { Toast.makeText(getApplicationContext(),position+"---"+mDatas.get(position),Toast.LENGTH_LONG).show(); } }); } private void initData() { mDatas = new ArrayList<String>(); for (int i = 0; i <= 50; i++) { mDatas.add("item---" +i); } } }
Adapter：
public class RecyclerAdapter1 extends RecyclerView.Adapter<RecyclerAdapter1.ViewHolder>{ private Context context; private List<String> list; public RecyclerAdapter1(Context context, List<String> list){ this.context=context; this.list=list; } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view= LayoutInflater.from(context).inflate(R.layout.demo1_item,parent,false); ViewHolder viewHolder=new ViewHolder(view); return viewHolder; } @Override public void onBindViewHolder(ViewHolder holder, int position) { holder.textView.setText(list.get(position)); } @Override public int getItemCount() { return list.size(); } private IOnClickListenter onClickListenter=null; public void setOnItemClickListener(IOnClickListenter listener) { this.onClickListenter=listener; } public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{ private TextView textView; public ViewHolder(View view) { super(view); textView=(TextView)view.findViewById(R.id.textview1); textView.setOnClickListener(this); } @Override public void onClick(View v) { if (onClickListenter != null) { onClickListenter.onItemClick(v,getPosition()); } } } }
上拉刷新下拉加载布局
<android.support.v4.widget.SwipeRefreshLayout android:id="@+id/swipeRefreshLayout" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.v7.widget.RecyclerView android:id="@+id/recyclerView" android:layout_width="match_parent" android:layout_height="match_parent"> </android.support.v7.widget.RecyclerView> </android.support.v4.widget.SwipeRefreshLayout>
上拉刷新下拉加载Activity
public class RecyclerViewPullActivity extends Activity { private SwipeRefreshLayout swipeRefreshLayout; private MyRefreshRecyclerView recyclerView; public static List<String> list=new ArrayList<String>(); private RecyclerAdapter2 adapter; private Handler mHandler = new Handler(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.demo2); initView(); } private void initView(){ swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_layout); recyclerView = (MyRefreshRecyclerView) findViewById(R.id.recycler); adapter=new RecyclerAdapter2(); recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext())); swipeRefreshLayout.setColorSchemeResources(R.color.blue,R.color.green); swipeRefreshLayout.post(new Runnable() { @Override public void run() { swipeRefreshLayout.setRefreshing(true); } }); mHandler.postDelayed(new Runnable() { @Override public void run() { getData(); recyclerView.setAdapter(adapter); adapter.notifyDataSetChanged(); swipeRefreshLayout.setRefreshing(false); } },1500); swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { mHandler.postDelayed(new Runnable() { @Override public void run() { getData(); recyclerView.setAdapter(adapter); adapter.notifyDataSetChanged(); swipeRefreshLayout.setRefreshing(false); } }, 1500); } }); recyclerView.setMyRefreshRecyclerViewListener(new MyRefreshRecyclerView.MyRefreshRecyclerViewListener() { @Override public void onLoadMore() { mHandler.postDelayed(new Runnable() { @Override public void run() { if (list.size() > 14) { recyclerView.setLoadMore(true); } else { int randomInt = new Random().nextInt(100); list.add("上拉加载添加数字:" + randomInt); adapter.notifyDataSetChanged(); recyclerView.setLoadMore(false); } } }, 1000); } }); } private void getData() { list.clear(); Random random = new Random(); while (list.size() < 12) { int randomInt = random.nextInt(100); list.add(String.valueOf(randomInt)); } } }
AS添加依赖库：
compile 'com.android.support:recyclerview-v7:23.2.1'
compile 'com.android.support:cardview-v7:23.2.1'
