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);        }    }}
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));        }    }}
添加依赖库：
 compile 'com.android.support:recyclerview-v7:23.2.1' compile 'com.android.support:cardview-v7:23.2.1'
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