Android之 RecyclerView，CardView 详解和相对应的上拉刷新下拉加载

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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));
}
}
}