Android SwipeRefreshLayout官方下拉刷新

现在github上面有很多下拉刷新第三方优秀的库。官方的下拉刷新可以基本上满足我们平时的需求

** SwipeRefreshLayout **是一个下拉刷新组件，主要用到四个方法：

boolean isRefreshing()
void setColorSchemeResources(int colorRes1,int colorRes2,int colorRes3,int colorRes4)
void setOnRefreshLiStener(SwipeRefreshLayout.OnRefreshListener listener)
void setRefreshing(boolean refreshing)

• 首先我们在布局文件添加** SwipeRefreshLayout **控件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.kevin.swiperefreshlayouttest.MainActivity">

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

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

• 在代码中引用它

package com.example.kevin.swiperefreshlayouttest;

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.ListView;

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

public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {
    private static final int CODE = 0x011;
    private SwipeRefreshLayout refresh;
    private ListView list_data;
    private ArrayAdapter<String> adapter;
    private List<String> dataList = new ArrayList<String>(Arrays.asList("Java", "Swift", "Node.js", "Python", "Kotlin"));
    private Handler handler = new Handler() {
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case CODE:
                    //刷新一次就添加数据
                    dataList.addAll(Arrays.asList("C", "C++", "C#"));
                    //通知界面改变
                    adapter.notifyDataSetChanged();
                    //刷新状态改变了
                    refresh.setRefreshing(false);
                    break;

            }
        }
    };

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

    private void initView() {
        refresh = (SwipeRefreshLayout) findViewById(R.id.refresh);
        list_data = (ListView) findViewById(R.id.list_data);
        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, dataList);
        //注册监听器
        refresh.setOnRefreshListener(this);
        //设置加载的颜色
        refresh.setColorSchemeResources(android.R.color.holo_blue_bright, android.R.color.holo_green_light, android.R.color.holo_orange_light, android.R.color.holo_red_light);
        list_data.setAdapter(adapter);
    }

    //回调方法
    @Override
    public void onRefresh() {
        handler.sendEmptyMessageDelayed(CODE, 500);
    }
}