SwipeRefreshLayout

你的名字 2021-01-07 04:38 402阅读 0赞

下拉刷新控件SwipeRefreshLayout，通过下拉刷新实现列表的刷新。  
activity\_main.xml：

<?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="com.fitsoft.MainActivity">
    
        <android.support.v4.widget.SwipeRefreshLayout
            android:id="@+id/swipe_refresh_layout"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
    
            <ListView
                android:id="@+id/my_list_view"
                android:layout_width="match_parent"
                android:layout_height="match_parent">
    
            </ListView>
        </android.support.v4.widget.SwipeRefreshLayout>
    </android.support.constraint.ConstraintLayout>

在下拉刷新控件中添加了一个ListView列表控件。  
MainActivity：

package com.fitsoft;
    
    import android.graphics.Color;
    import android.os.Bundle;
    import android.os.Handler;
    import android.support.v4.widget.SwipeRefreshLayout;
    import android.support.v7.app.AppCompatActivity;
    import android.widget.ArrayAdapter;
    import android.widget.ListView;
    import android.widget.Toast;
    
    import java.util.ArrayList;
    import java.util.List;
    
    public class MainActivity extends AppCompatActivity {
    
        SwipeRefreshLayout swipeRefreshLayout;
        ListView listView;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            swipeRefreshLayout = findViewById(R.id.swipe_refresh_layout);
            listView = findViewById(R.id.my_list_view);
    
            final List<String> list = new ArrayList<>();
            for(int i=0; i<30; i++){
                list.add(i+"");
            }
    
            final ArrayAdapter<String> adapter = new ArrayAdapter<>(this, 
                    android.R.layout.simple_list_item_1,
                    android.R.id.text1, list);
    
            listView.setAdapter(adapter);
            swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
                @Override
                public void onRefresh() {
                    new Handler().postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            swipeRefreshLayout.setRefreshing(false);
                            Toast.makeText(MainActivity.this, "加载完成！", Toast.LENGTH_SHORT).show();
                            for(int i=0; i<20; i++){
                                list.add("新加的数据："+i);
                            }
                            adapter.notifyDataSetChanged();
                        }
                    }, 2000);
                }
            });
            //循环一圈颜色
            swipeRefreshLayout.setColorSchemeColors(Color.RED, Color.GREEN, Color.BLUE, Color.CYAN);
            //下拉高度
            swipeRefreshLayout.setProgressViewOffset(false, 200, 500);
        }
    }

这里首先为ListView绑定适配器，并且设置数据源，数据源就是0-29的字符串。