安卓下拉刷新SwipeRefreshLayout

最新推荐文章于 2025-05-28 10:26:52 发布

原创最新推荐文章于 2025-05-28 10:26:52 发布 · 821 阅读

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本文介绍了如何使用SwipeRefreshLayout在安卓中实现下拉刷新功能。通过将ListView等控件放入SwipeRefreshLayout，可以轻松添加刷新支持。代码示例展示了设置过程，并提供了改进的建议，以延长下拉条转动的时间。

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SwipeRefreshLayout就是用于实现下拉刷新功能的核心类，我们把想要实现下拉刷新功能的控件放置到SwipeRefreshLayout中,就可以迅速让这个控件支持下拉刷新。
代码比较简单，直接上代码：

activity_main.xml
这里想让listview实现刷新功能，所以把listview放到SwipeRefreshLayout中。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
    android:id="@+id/swipe_refresh_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></ListView>
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

</LinearLayout>

MainActivity

public class MainActivity extends AppCompatActivity {
    private String[] data = {"盖伦", "德玛", "大宝剑", "皇子", "德邦","蛮王","艾希","布隆"};
    private String[] sourceData = new String[50];
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView listView=findViewById(R.id.list_view);
        final SwipeRefreshLayout swipeRefreshLayout=findViewById(R.id.swipe_refresh_layout);
        initData();
        final ArrayAdapter<String> adapter=new ArrayAdapter<>(this,android.R.layout.simple_list_item_1,sourceData);
        listView.setAdapter(adapter);
        //设置转动条颜色
        swipeRefreshLayout.setColorSchemeResources(R.color.colorAccent);
        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                initData();
                adapter.notifyDataSetChanged();
                //隐藏转动条
                swipeRefreshLayout.setRefreshing(false);
            }
        });

    }
    private void initData() {

        for (int i = 0; i < 50; i++) {
            Random random = new Random();
            // index为一个[0,data.length)区间的一个随机数
            int index = random.nextInt(data.length);
            // 将data数组中的数据随机赋值给sourceData数组
            sourceData[i] = data[index];
        }
    }
}

实现效果
在这里插入图片描述
这个可以继续改善，让下拉条多转一会儿
改上的代码：

public class MainActivity extends AppCompatActivity {
    private String[] data = {"盖伦", "德玛", "大宝剑", "皇子", "德邦","蛮王","艾希","布隆"};
    private String[] sourceData = new String[50];
    Handler mHandler=new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            switch (msg.what){
                case 10010:
                    initData();
                    mAdapter.notifyDataSetChanged();
                    mSwipeRefreshLayout.setRefreshing(false);
                    break;
            }
        }
    };
    private SwipeRefreshLayout mSwipeRefreshLayout;
    private ArrayAdapter<String> mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView listView=findViewById(R.id.list_view);
        mSwipeRefreshLayout = findViewById(R.id.swipe_refresh_layout);
        initData();
        mAdapter = new ArrayAdapter<>(this,android.R.layout.simple_list_item_1,sourceData);
        listView.setAdapter(mAdapter);
        //设置颜色
        mSwipeRefreshLayout.setColorSchemeResources(R.color.colorAccent);
        mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
               new Thread(){
                   @Override
                   public void run() {
                       try {
                           sleep(2000);
                       } catch (InterruptedException e) {
                           e.printStackTrace();
                       }
                       mHandler.sendEmptyMessage(10010);
                   }
               }.start();
            }
        });

    }
    private void initData() {

        for (int i = 0; i < 50; i++) {
            Random random = new Random();
            // index为一个[0,data.length)区间的一个随机数
            int index = random.nextInt(data.length);
            // 将data数组中的数据随机赋值给sourceData数组
            sourceData[i] = data[index];
        }
    }
}

效果
在这里插入图片描述
建议去看传送门