下拉刷新——Android使用SwipeRefreshLayout简单实现下拉刷新与加载跟多

最新推荐文章于 2024-10-31 10:50:45 发布

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最新推荐文章于 2024-10-31 10:50:45 发布

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分类专栏：【下拉刷新】文章标签： SwipeRefre

本文链接：https://blog.youkuaiyun.com/Tomasyb/article/details/76164153

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1 篇文章

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本文详细介绍了如何在Android应用中使用SwipeRefreshLayout实现下拉刷新功能，并结合RecyclerView实现加载更多数据。从效果图到具体布局文件（如主布局、MainActivity、RecyclerViewAdapter、item模板等）逐一解析，帮助开发者理解并实现这一常见交互效果。

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首先我们看效果图

一、效果图

这里写图片描述

二、主布局

<?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>

二、MainActivity

package com.leohan.refresh;

import android.os.Bundle;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import butterknife.ButterKnife;
import butterknife.InjectView;

public class MainActivity extends AppCompatActivity {
    @InjectView(R.id.toolbar)
    Toolbar toolbar;
    @InjectView(R.id.recyclerView)
    RecyclerView recyclerView;
    @InjectView(R.id.SwipeRefreshLayout)
    SwipeRefreshLayout swipeRefreshLayout;

    boolean isLoading;
    private List<Map<String, Object>> data = new ArrayList<>();
    private RecyclerViewAdapter adapter = new RecyclerViewAdapter(this, data);
    private Handler handler = new Handler();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_notice);
        ButterKnife.inject(this);
        initView();
        initData();
    }

    public void initView() {
        setSupportActionBar(toolbar);
        toolbar.setTitle(R.string.notice);
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });

        swipeRefreshLayout.setColorSchemeResources(R.color.blueStatus);
        swipeRefreshLayout.post(new Runnable() {
            @Override
            public void run() {
                swipeRefreshLayout.setRefreshing(true);
            }
        });

        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        data.clear();
                        getData();
                    }
                }, 2000);
            }
        });
        final LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setAdapter(adapter);
        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @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");

                int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();
                if (lastVisibleItemPosition + 1 == adapter.getItemCount()) {
                    Log.d("test", "loading executed");

                    boolean isRefreshing = swipeRefreshLayout.isRefreshing();
                    if (isRefreshing) {
                        adapter.notifyItemRemoved(adapter.getItemCount());
                        return;
                    }
                    if (!isLoading) {
                        isLoading = true;
                        handler.postDelayed(new Runnable() {
                            @Override
                            public void run() {
                                getData();
                                Log.d("test", "load more completed");
                                isLoading = false;
                            }
                        }, 1000);
                    }
                }
            }
        });

        //添加点击事件
        adapter.setOnItemClickListener(new RecyclerViewAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
                Log.d("test", "item position = " + position);
            }

            @Override
            public void onItemLongClick(View view, int position) {

            }
        });
    }


    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 < 6; i++) {
            Map<String, Object> map = new HashMap<>();
            data.add(map);
        }
        adapter.notifyDataSetChanged();
        swipeRefreshLayout.setRefreshing(false);
        adapter.notifyItemRemoved(adapter.getItemCount());
    }


}

三、RecyclerViewAdapter

package com.leohan.refresh;

import android.content.Context;
import android.support.v7.widget.RecyclerView.Adapter;
import android.support.v7.widget.RecyclerView.ViewHolder;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.List;

public class RecyclerViewAdapter extends Adapter<ViewHolder> {

    private static final int TYPE_ITEM = 0;
    private static final int TYPE_FOOTER = 1;
    private Context context;
    private List data;


    public RecyclerViewAdapter(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 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.item_foot, parent,
                    false);
            return new FootViewHolder(view);
        }
        return null;
    }


    @Override
    public void onBindViewHolder(final ViewHolder holder, int position) {
        if (holder instanceof ItemViewHolder) {
            //holder.tv.setText(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 ViewHolder {

        TextView tv;

        public ItemViewHolder(View view) {
            super(view);
            tv = (TextView) view.findViewById(R.id.tv_date);
        }
    }

    static class FootViewHolder extends ViewHolder {

        public FootViewHolder(View view) {
            super(view);
        }
    }
}

四、item_base

<?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="@dimen/margin_10"
    android:layout_marginRight="@dimen/margin_10"
    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"
            style="@style/NormalTextView"
            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"
                style="@style/SmallGreyTextView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:ellipsize="end"
                android:maxLines="2"
                android:text="视线好转,0729出口开通,0621进口开通。视线好转,0729出口开通,0621进口开通。" />

        </android.support.v7.widget.CardView>
    </LinearLayout>

</android.support.v7.widget.CardView>

五、item_foot.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:gravity="center"
    android:orientation="horizontal"
 >


    <ProgressBar
        android:layout_marginRight="6dp"
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />

    <TextView
        style="@style/SmallGreyTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="@string/loading" />


</LinearLayout>

六、toolbar.xml

<?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>

七、其他

颜色：

<?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>
//尺寸：

    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
    <dimen name="margin_10">10dp</dimen>

    <dimen name="textSize_title">20sp</dimen>
    <dimen name="textSize_normal">16sp</dimen>
    <dimen name="textSize_small">14sp</dimen>


//strings
<resources>
    <string name="app_name">RefreshDemo</string>
    <string name="loading">加载中…</string>
    <string name="notice">重要公告</string>
</resources>

//styles
<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/blueStatus</item>
        <item name="colorPrimaryDark">@color/blueStatus</item>
        <item name="colorAccent">@color/colorAccent</item>
        <item name="windowActionBar">false</item>
        <item name="android:windowNoTitle">true</item>
    </style>

    <style name="AppBaseTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="colorPrimary">@color/blueStatus</item>
        <item name="colorPrimaryDark">@color/blueStatus</item>
        <item name="colorAccent">@color/blueStatus</item>
        <item name="windowActionBar">false</item>
        <item name="android:windowNoTitle">true</item>
    </style>

    <!--TextView-->

    <style name="NormalTextView">
        <item name="android:textColor">@color/dark</item>
        <item name="android:textSize">@dimen/textSize_normal</item>
    </style>

    <style name="NormalGreyTextView">
        <item name="android:textColor">@color/grey</item>
        <item name="android:textSize">@dimen/textSize_normal</item>
    </style>

    <style name="SmallTextView">
        <item name="android:textColor">@color/dark</item>
        <item name="android:textSize">@dimen/textSize_small</item>
    </style>

    <style name="SmallGreyTextView">
        <item name="android:textColor">@color/grey</item>
        <item name="android:textSize">@dimen/textSize_small</item>
    </style>
</resources>