采用SwipeFreshLayout+Recyclerview实现下拉刷新和上拉加载更多以及CoordinatorLayout的引入
2024-05-23 09:14:20
之前都是采用PullToRefresh进行下拉刷新和下拉加载，现在采用谷歌自己的控件SwipeFreshLayout，配合Recyclerview来实现这一效果。使用SwipeRefreshLayout可以实现下拉刷新，前提是布局里需要包裹一个可以滑动的子控件，可以是ListView或者Recyclerview，这里我们采用后者，然后在代码里设置OnRefreshListener设置监听，最后在监听里设置刷新时的数据获取就可以了。CoordinatorLayout主要是为了实现下滑时标题栏隐藏的功能，以后会单独介绍。
SwipeRefreshLayout主要方法介绍
SwipeRefreshLayout只能有一个孩子
isRefreshing()
- 判断当前的状态是否是刷新状态。
setColorSchemeResources(int... colorResIds)
- 设置下拉进度条的颜色主题，参数为可变参数，并且是资源id，可以设置多种不同的颜色，每转一圈就显示一种颜色。
setOnRefreshListener(SwipeRefreshLayout.OnRefreshListener listener)
- 设置监听，需要重写onRefresh()方法，顶部下拉时会调用这个方法，在里面实现请求数据的逻辑，设置下拉进度条消失等等。
setProgressBackgroundColorSchemeResource(int colorRes)
- 设置下拉进度条的背景颜色，默认白色。
setRefreshing(boolean refreshing)
- 设置刷新状态，true表示正在刷新，false表示取消刷新。
1.添加build.gradle依赖
compile 'com.android.support:recyclerview-v7:25.0.0' compile 'com.android.support:cardview-v7:25.3.1' compile 'com.android.support:design:25.3.1'
2.设置app主题
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/Theme.AppCompat.Light.NoActionBar">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
3.MainActiviy
public class MainActivity extends AppCompatActivity {private SwipeRefreshLayout swipeRefreshLayout;
private RecyclerView recyclerView;
private List<String> data = new ArrayList<>();
public boolean isLoading;
private RefreshRecyclerAdapter adapter = new RefreshRecyclerAdapter(this, data);
private Handler handler = new Handler();
private Toolbar toolbar;
int topcount = 1;
int footcount = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.SwipeRefreshLayout);
recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
toolbar.setTitle(R.string.notice);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {@Override
public void onClick(View v) {finish();
}});
initData();
initView();
}private void initView() {//设置加载进度的颜色变化值
swipeRefreshLayout.setColorSchemeResources(R.color.blueStatus,R.color.colorAccent, R.color.colorPrimary, R.color.colorPrimaryDark);
//设置一进入开始刷新
swipeRefreshLayout.post(new Runnable() {@Override
public void run() {swipeRefreshLayout.setRefreshing(true);
}});
//设置下拉刷新的监听器
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {@Override
public void onRefresh() {handler.postDelayed(new Runnable() {@Override
public void run() {addTopNewData();
}}, 2000);
}});
final LinearLayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);
//通过recyclerView的onscrolllistener的监听来实现上拉加载更多的功能
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {//滚动的三种状态包括SCROLL_STATE_IDEL 离开状态 SCROLL_STATE_DRAGGING 手指触摸 SCROLL_STATE_SETLING 加速滑动的时候
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {super.onScrollStateChanged(recyclerView, newState);
Log.d("test", "StateChanged = " + newState);
}@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {super.onScrolled(recyclerView, dx, dy);
Log.d("test", "onScrolled");
// 获取最后一个可见条目
int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();
if (lastVisibleItemPosition + 1 == adapter.getItemCount()) {Log.d("test", "loading executed");
//获取刷新状态
boolean isRefreshing = swipeRefreshLayout.isRefreshing();
if (isRefreshing) {adapter.notifyItemRemoved(adapter.getItemCount());
return;
}if (!isLoading) {isLoading = true;
handler.postDelayed(new Runnable() {@Override
public void run() {addNewData();
Log.d("test", "load more completed");
isLoading = false;
}}, 1000);
}}}});
//添加点击事件
adapter.setOnItemClickListener(new RefreshRecyclerAdapter.OnItemClickListener() {@Override
public void onItemClick(View view, int position) {Log.d("test", "item position = " + position);
}@Override
public void onItemLongClick(View view, int position) {}});
}/**
* 下拉加载更多
*/
private void addTopNewData() {for (int i = topcount; i < topcount +6; i++) {data.add(0,"下拉加载的第"+i+"条数据");
}topcount += 6;
adapter.notifyDataSetChanged();
swipeRefreshLayout.setRefreshing(false);
}public void initData() {handler.postDelayed(new Runnable() {@Override
public void run() {getData();
}}, 1500);
}/**
* 获取测试数据
*/
private void getData() {for (int i =0; i <10; i++) {data.add(i,"第"+i+"条数据");
}adapter.notifyDataSetChanged();
swipeRefreshLayout.setRefreshing(false);
// adapter.notifyItemRemoved(adapter.getItemCount());
}/**
* 上拉加载更多
*/
public void addNewData() {for (int i = footcount; i < footcount+ 6; i++) {data.add(data.size(),"上拉加载的第"+i+"条数据");
}footcount += 6;
adapter.notifyDataSetChanged();
swipeRefreshLayout.setRefreshing(false);
//adapter.notifyItemRemoved(adapter.getItemCount());
}}
4.RefreshRecyclerAdapter
public class RefreshRecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {private static final int TYPE_ITEM = 0;
private static final int TYPE_FOOTER = 1;//上拉加载更多布局
private Context context;
private List data;
public RefreshRecyclerAdapter(Context context, List data) {this.context = context;
this.data = data;
}public interface OnItemClickListener {void onItemClick(View view, int position);
void onItemLongClick(View view, int position);
}private OnItemClickListener onItemClickListener;
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {this.onItemClickListener = onItemClickListener;
}@Override
public int getItemCount() {return data.size() == 0 ? 0 : data.size() + 1;
}@Override
public int getItemViewType(int position) {if (position + 1 == getItemCount()) {return TYPE_FOOTER;
} else {return TYPE_ITEM;
}}@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {if (viewType == TYPE_ITEM) {View view = LayoutInflater.from(context).inflate(R.layout.item_base, parent,
false);
return new ItemViewHolder(view);
} else if (viewType == TYPE_FOOTER) {View view = LayoutInflater.from(context).inflate(R.layout.view_footer, parent,
false);
return new FootViewHolder(view);
}return null;
}@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {if (holder instanceof ItemViewHolder) {((ItemViewHolder) holder).tv.setText((CharSequence) data.get(position));
if (onItemClickListener != null) {holder.itemView.setOnClickListener(new View.OnClickListener() {@Override
public void onClick(View v) {int position = holder.getLayoutPosition();
onItemClickListener.onItemClick(holder.itemView, position);
}});
holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {@Override
public boolean onLongClick(View v) {int position = holder.getLayoutPosition();
onItemClickListener.onItemLongClick(holder.itemView, position);
return false;
}});
}}}static class ItemViewHolder extends RecyclerView.ViewHolder {TextView tv;
public ItemViewHolder(View view) {super(view);
tv = (TextView) view.findViewById(R.id.tv_date);
}}static class FootViewHolder extends RecyclerView.ViewHolder {public FootViewHolder(View view) {super(view);
}}
}
5.布局文件
ToolBar
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/blueStatus"
android:minHeight="?attr/actionBarSize"
app:layout_scrollFlags="scroll|enterAlways"
app:navigationIcon="?attr/homeAsUpIndicator"
app:theme="@style/Theme.AppCompat.NoActionBar">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
</merge>
MainActivity布局文件
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
android:orientation="vertical"
>
<include layout="@layout/toolbar" />
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/SwipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical">
</android.support.v7.widget.RecyclerView>
</android.support.v4.widget.SwipeRefreshLayout>
</android.support.design.widget.CoordinatorLayout>
item_base布局文件
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="6dp"
android:orientation="vertical"
app:cardBackgroundColor="@color/line"
app:cardPreventCornerOverlap="true"
app:cardUseCompatPadding="true"
app:contentPadding="6dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/tv_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2015-12-11 12:00" />
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:cardBackgroundColor="@color/white"
app:cardPreventCornerOverlap="true"
app:cardUseCompatPadding="true"
app:contentPadding="10dp">
<TextView
android:id="@+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="end"
android:maxLines="2"
android:text="swipefreshlayout测试使用通过。。通过。。通过。" />
</android.support.v7.widget.CardView>
</LinearLayout>
</android.support.v7.widget.CardView>
viewFooter布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="50dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="50dp">
<ProgressBar
android:id="@+id/load_progress"
android:layout_width="25dp"
android:layout_height="25dp"
android:layout_centerVertical="true"
android:layout_marginLeft="30dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="正在努力加载中..."
android:textColor="@android:color/holo_red_dark"
android:textSize="15sp"/>
</RelativeLayout>
</RelativeLayout>
colors.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="colorPrimary">#3F51B5</color>
<color name="colorPrimaryDark">#303F9F</color>
<color name="colorAccent">#FF4081</color>
<color name="blueText">#1485C6</color>
<color name="blueIndexStatus">#67A5EF</color>
<color name="blueStatus">#1680E2</color>
<color name="white">#FFFFFFFF</color>
<color name="dark">#424242</color>
<color name="red">#FFD4212A</color>
<color name="grey">#8C8C8C</color>
<color name="line">#EEEEEE</color>
<color name="background">#F9F9FA</color>
<color name="greyBackground">#FFCFCFCF</color>
</resources>
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