1min初识SwipeRefreshLayout

Android开发中使用最多的数据刷新方式应该就是下拉刷新，我们可以使用第三方的开源库PullToRefresh或者Google自己的下拉组件SwipeRefreshLayout，下面我们1min快速学习如何使用SwipeRefreshLayout。

我们先写好布局文件，RelativeLayout里有一个SwipeRefreshLayout，SwipeRefreshLayout里有一个ListView：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">

<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/content_srl_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="3dp">

<ListView
android:id="@+id/content_lv_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
></ListView>
</android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>

接下来我们开始Java代码的编写：

实现SwipeRefreshLayout.OnRefreshListener接口，声明相关变量，定义Handler：

public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener{

private SwipeRefreshLayout mSwipeRefreshLayout;
private ArrayAdapter<String> mAdapter;
private int mIndex = 1;
private List<String> mList = new ArrayList<>();
private ListView mListView;
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
}
};

进行控件的绑定，数据的初始化操作：

mSwipeRefreshLayout = (android.support.v4.widget.SwipeRefreshLayout) findViewById(R.id.content_srl_main);
mListView = (ListView) findViewById(R.id.content_lv_main);

for (int i = 0; i < 20; i++) {
mList.add("第" + mIndex + "次刷新：权-" + i);
}
mAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, mList);
mListView.setAdapter(mAdapter);

简单设置一下SwipeRefreshLayout：

//改变加载显示的颜色
mSwipeRefreshLayout.setColorSchemeColors(Color.RED, Color.YELLOW);
//设置背景颜色
//swipeRefreshLayout.setBackgroundColor(Color.YELLOW);
//设置进度圈的大小，只有两个值：DEFAULT、LARGE
mSwipeRefreshLayout.setSize(SwipeRefreshLayout.LARGE);
//设置监听
mSwipeRefreshLayout.setOnRefreshListener(this);

重写刷新方法，更新数据，并通过Handle发到UI线程：

@Override
public void onRefresh() {

//设置每次刷新时需要更新的数据
mList.clear();
mIndex++;
for (int i = 0; i < 20; i++) {
mList.add("第" + mIndex + "次刷新：权-" + i);
}
new Thread(new Runnable() {
@Override
public void run() {
try {
//然刷新控件停留1秒后消失
Thread.sleep(1000);
mHandler.post(new Runnable() {//在主线程执行
@Override
public void run() {
//更新数据
mAdapter.notifyDataSetChanged();
//停止刷新
mSwipeRefreshLayout.setRefreshing(false);
}
});
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();

}

run一下效果如图：



最后附上完整源代码：

import android.graphics.Color;
import android.os.Handler;
import android.os.Message;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener{

private SwipeRefreshLayout mSwipeRefreshLayout;
private ArrayAdapter<String> mAdapter;
private int mIndex = 1;
private List<String> mList = new ArrayList<>();
private ListView mListView;
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mSwipeRefreshLayout = (android.support.v4.widget.SwipeRefreshLayout) findViewById(R.id.content_srl_main);
mListView = (ListView) findViewById(R.id.content_lv_main);

for (int i = 0; i < 20; i++) {
mList.add("第" + mIndex + "次刷新：权-" + i);
}
mAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, mList);
mListView.setAdapter(mAdapter);

//改变加载显示的颜色
mSwipeRefreshLayout.setColorSchemeColors(Color.RED, Color.YELLOW);
//设置背景颜色
//swipeRefreshLayout.setBackgroundColor(Color.YELLOW);
//设置进度圈的大小，只有两个值：DEFAULT、LARGE
mSwipeRefreshLayout.setSize(SwipeRefreshLayout.LARGE);
//设置监听
mSwipeRefreshLayout.setOnRefreshListener(this);
}

@Override
public void onRefresh() {

//设置每次刷新时需要更新的数据
mList.clear();
mIndex++;
for (int i = 0; i < 20; i++) {
mList.add("第" + mIndex + "次刷新：权-" + i);
}
new Thread(new Runnable() {
@Override
public void run() {
try {
//然刷新控件停留1秒后消失
Thread.sleep(1000);
mHandler.post(new Runnable() {//在主线程执行
@Override
public void run() {
//更新数据
mAdapter.notifyDataSetChanged();
//停止刷新
mSwipeRefreshLayout.setRefreshing(false);
}
});
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();

}
}