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>
在这里插入图片描述
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);
}
在这里插入图片描述
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);
}
在这里插入图片描述
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>
在这里插入图片描述
可能会遇到的错误
1.Error inflating class android.support.v4.widget.SwipeRefreshLayout
解决：android.support.v4.widget.SwipeRefreshLayout改为androidx.swiperefreshlayout.widget.SwipeRefreshLayout
网友评论