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SwipeRefreshLayout的基本使用

简介

SwipRefreshLayout是谷歌前一段时间推出的一款下拉刷新控件。

常用方法

方法	解释
setColorSchemeResources(int…colorReslds)	设置下拉进度条的颜色主题，参数可变，并且是资源id，最多设置四种不同的颜色。
setProgressBackgroundSchemeResource(int coloRes)	设置下拉进度条的背景颜色,默认白色。
isRefreshing()	判断当前的状态是否是刷新状态。
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。
setRefreshing(boolean refreshing)	设置刷新状态，true表示正在刷新，false表示取消刷新。

使用

1.首先在应用或模块的 build.gradle 文件中添加所需工件的依赖项：

dependencies {
    implementation "androidx.swiperefreshlayout:swiperefreshlayout:1.0.0"
   
}

2.在xml文件里面添加相关代码

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

    <android.support.v4.widget.SwipeRefreshLayout>
        
    </android.support.v4.widget.SwipeRefreshLayout>

</LinearLayout>

3.添加布局代码

<?xml version="1.0" encoding="utf-8"?>
    <android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:id="@+id/swipeLayout">
    <ListView android:id="@+id/aa" android:layout_width="match_parent" android:layout_height="match_parent"/>
    </android.support.v4.widget.SwipeRefreshLayout>

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4.setColorSchemeResources(int…colorReslds)，可以改变下拉刷新时的颜色

public class MainActivity extends AppCompatActivity { 
   
    private SwipeRefreshLayout swipeRefreshLayout;
    @SuppressLint("ResourceAsColor")
    @Override
    protected void onCreate(Bundle savedInstanceState) { 
   
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout);
        SwipeRefreshLayout swip_refresh_layout=findViewById(R.id.swipeLayout);
        swip_refresh_layout.setColorSchemeResources(R.color.colorPrimary);
    }

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5.setProgressBackgroundSchemeResource(int coloRes),设置下拉进度的背景颜色

public class MainActivity extends AppCompatActivity { 
   
    private SwipeRefreshLayout swipeRefreshLayout;
    @SuppressLint("ResourceAsColor")
    @Override
    protected void onCreate(Bundle savedInstanceState) { 
   
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout);
        SwipeRefreshLayout swip_refresh_layout=findViewById(R.id.swipeLayout);
        swip_refresh_layout.setColorSchemeResources(R.color.colorPrimary);      swip_refresh_layout.setProgressBackgroundColorSchemeColor(R.color.colorPrimaryDark);
    }

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6.setRefreshing(boolean refreshing)设置刷新状态，false代表停止执行

swip_refresh_layout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { 
   
    @Override
    public void onRefresh() { 
   
        new Handler().postDelayed(new Runnable() { 
   
            @Override
            public void run() { 
   
                swip_refresh_layout.setRefreshing(false);
            }
        },2000);
    }
});

在这里插入图片描述
7.全部整理好后，再加上几个item，完整的代码如下

package com.example.swiperefreshlayout;

import androidx.appcompat.app.AppCompatActivity;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;

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

public class MainActivity extends AppCompatActivity { 
   
    private SwipeRefreshLayout swipeRefreshLayout;
    private String[] names = new String[]
            { 
   "Lion","Tiger","Monkey","Dog","Cat","Elephant"};
    @SuppressLint("ResourceAsColor")
    @Override
    protected void onCreate(Bundle savedInstanceState) { 
   
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout);
        //创建list集合
        ListView list = findViewById(R.id.aa);
        List<Map<String,Object>> listItems =
                new ArrayList<>();
        for (int i=0;i<names.length;i++)
        { 
   
            Map<String,Object> listItem =new HashMap<>();
            listItem.put("names",names[i]);
            listItems.add(listItem);
        }
        SimpleAdapter simpleAdapter=new SimpleAdapter(this,listItems,R.layout.item,
                new String[]{ 
   "names"}
                ,new int[]{ 
   R.id.names});
        list.setAdapter(simpleAdapter);
        //SwipeRefreshLayout功能介绍
        final SwipeRefreshLayout swip_refresh_layout=findViewById(R.id.swipeLayout);
        swip_refresh_layout.setColorSchemeResources(R.color.colorPrimary);
        swip_refresh_layout.setProgressBackgroundColorSchemeColor(R.color.colorPrimaryDark);
        swip_refresh_layout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { 
   
            @Override
            public void onRefresh() { 
   
                new Handler().postDelayed(new Runnable() { 
   
                    @Override
                    public void run() { 
   
                        swip_refresh_layout.setRefreshing(false);
                    }
                },2000);
            }
        });
    }


}

item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent">
    <TextView android:id="@+id/names" android:layout_width="match_parent" android:layout_height="70dp" android:paddingLeft="10dp" android:layout_marginTop="5dp" android:textColor="@color/colorPrimaryDark" android:textSize="30dp" />
</LinearLayout>

layout.xml

<?xml version="1.0" encoding="utf-8"?>
    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:id="@+id/swipeLayout">

        <ListView android:id="@+id/aa" android:layout_width="match_parent" android:layout_height="74dp" />

    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>