Android 刷新下拉控制 SwipeRefreshLayout

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mob604756fd2a33 2015-09-17 16:08:00

文章标签 android ide 控件 xml 布局文件 文章分类 代码人生

上个月，google它宣布了自己的下拉刷新控制------SwipeRefreshLayout，控制封装在android-support-v4.jar包裹，依靠听力OnRefreshListener实施刷新操作。

件使用方法十分简单，setEnable()方法控制刷新是否可用，setRefreshing()方法控制刷新进度条动画是否可用。因为是要实现下拉刷新，官方文档明白指出该控件所含有的一个直接子View必须是可以滚动的，如ListView、ScrollView等等。

要使用该控件，须要如今布局文件定义SwipeRefreshLayout控件，布局文件例如以下：

<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/swipe"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </ListView>

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

listView 的item布局文件：

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

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:textSize="20sp"
        android:text="TextView" />

</RelativeLayout>

主activity代码例如以下：

package com.example.android_test_swiperefreshlayout;

import java.util.ArrayList;

import android.os.Bundle;
import android.os.Handler;
import android.R.integer;
import android.app.Activity;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnRefreshListener
{
    private SwipeRefreshLayout swipeLayout;
    private ListView listView;
    private ArrayList<String> list;
    private MyAdapter adapter;
    private int count = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initData();
    swipeLayout = (SwipeRefreshLayout) findViewById(R.id.swipe);
    swipeLayout.setColorScheme(android.R.color.holo_blue_bright,
        android.R.color.holo_green_light, android.R.color.holo_orange_light,
        android.R.color.holo_red_light);

    listView = (ListView) findViewById(R.id.list);
    adapter = new MyAdapter();
    listView.setAdapter(adapter);
    swipeLayout.setOnRefreshListener(this);
    }

    public void initData()
    {
    list = new ArrayList<String>();
    for (int i = 0; i < 24; i++)
    {
        list.add("北京" + i);
    }
    count = 24;
    }

    class MyAdapter extends BaseAdapter
    {

    @Override
    public int getCount()
    {
        // TODO Auto-generated method stub
        return list.size();
    }

    @Override
    public Object getItem(int position)
    {
        // TODO Auto-generated method stub
        return list.get(position);
    }

    @Override
    public long getItemId(int position)
    {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        // TODO Auto-generated method stub
        if (convertView == null)
        {
        convertView = LayoutInflater.from(getApplicationContext()).inflate(R.layout.item,
            null);
        }
        TextView textView = (TextView) convertView.findViewById(R.id.textView1);
        textView.setText(list.get(position));
        return convertView;
    }

    }

    @Override
    public void onRefresh()
    {
    // TODO Auto-generated method stub
    new Handler().postDelayed(new Runnable()
    {

        @Override
        public void run()
        {
        // TODO Auto-generated method stub
        swipeLayout.setRefreshing(true);
        list.add("新增北京"+count);
        count++;
        adapter.notifyDataSetChanged();

        }
    }, 3000);
    }

}