PullToRefresh的簡單使用

杭州壽星 8年前發布 | 21K 次閱讀 Android開發 移動開發

來自: http://blog.csdn.net//chenguang79/article/details/43194637


  在做android項目的時候,我們經常要用到上拉刷新列表,下拉刷新列表的功能,這里簡單介紹一個PullToRefresh的使用。

  一,下載PullToRefresh,地址:https://github.com/chrisbanes/Android-PullToRefresh。這里面,我們只要其中的Library工程。將它引入我們的工程,在android studio1.01中的引用方法,請看http://blog.csdn.net/chenguang79/article/details/43150303

        二,應用,這里我使用了一個自定義的Adapter,我感覺這樣能更好的和實戰結和起來。下面是代碼,我在代碼里,都進行了注解

           1,布局文件(activity_user_defined_list__pulltore_fresh.xml)

           

<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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.example.cg.studiotest.userDefinedList_PulltoreFresh">

    <!--下面就是PullToRefresh控件-->
    <com.handmark.pulltorefresh.library.PullToRefreshListView
        android:id="@+id/userDefinedList_pull_refresh_list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:cacheColorHint="#00000000"
        android:divider="#19000000"
        android:dividerHeight="4dp"
        android:fadingEdge="none"
        android:fastScrollEnabled="false"
        android:footerDividersEnabled="false"
        android:headerDividersEnabled="false"
        android:smoothScrollbar="true" />

</RelativeLayout>
  
這個控件的屬性基本上和listVIew是一樣的,就不多說了。

   2,列表布局文件(pulltorefresh_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"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/txt_pulltorefresh_item_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <ImageView
        android:id="@+id/img_pulltorefresh_item_img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher"/>
</LinearLayout>

          3,程序(userDefinedList_PulltoreFresh.java)

               

package com.example.cg.studiotest;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.widget.ListView;
import android.widget.Toast;

import com.example.cg.baseAdapter.pulltorefresh_baseAdapter;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshListView;

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


public class userDefinedList_PulltoreFresh extends Activity {

    //定義下拉刷新列表控件
    private PullToRefreshListView userDefinedList_pull_refresh_list;
    //定義原始數據源
    private String[] mainStr = {"宋元通寶","太平通寶","淳化元寶","至道元寶","咸平元寶","景德元寶","祥福元寶",
            "祥福通寶","天禧通寶","天圣元寶","明道元寶","景祐元寶","皇寶通寶","慶歷重寶"};
    //定義新加的數據源
    private String[] strArray = {"至和元寶","至和重寶","嘉祐元寶","喜祐通寶","治平元寶","熙寧元寶","熙寧通寶"};
    //定義要從新的數據源中取出哪個值
    private int num;
    //定義List的Adapter
    private pulltorefresh_baseAdapter pullAdapter;
    //定義向Adaptger中傳值的數據
    private List<String> listDate;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_user_defined_list__pulltore_fresh);
        //初始化數據
        listDate = new ArrayList<String>();
        //初始化值
        num = 0;

        //循環給數據賦值
        for(int i=0;i<mainStr.length;i++)
        {

            listDate.add(mainStr[i]);
        }
        //初始化下拉列表控件
        userDefinedList_pull_refresh_list = (PullToRefreshListView)this.findViewById(R.id.userDefinedList_pull_refresh_list);
        userDefinedList_pull_refresh_list.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener<ListView>() {
            @Override
            public void onRefresh(PullToRefreshBase<ListView> refreshView) {
                String twoInfo = DateUtils.formatDateTime(getApplicationContext(),System.currentTimeMillis(),
                               DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL);

                //下拉時,顯示的主要文字,一般的情況下,我們不修改它
                refreshView.getLoadingLayoutProxy().setReleaseLabel("放手開始加載數據");
                //下拉時,第二行顯示的文字
                refreshView.getLoadingLayoutProxy().setLastUpdatedLabel(twoInfo);
                //數據刷新的時候,顯示的文字
                refreshView.getLoadingLayoutProxy().setRefreshingLabel("數據加載中......");
                //刷新結束后,顯示的文字,沒有什么意義,一間而過
                refreshView.getLoadingLayoutProxy().setPullLabel("數據加載完成!");

                //調用異步,開始加載
                new GetDataTask().execute();

            }
        });
        //設置底部下拉刷新模式
        userDefinedList_pull_refresh_list.setMode(PullToRefreshBase.Mode.PULL_FROM_END);

        pullAdapter = new pulltorefresh_baseAdapter(this,listDate);

        //設置適配器
        ListView actualListView = userDefinedList_pull_refresh_list.getRefreshableView();
        actualListView.setAdapter(pullAdapter);
    }


    private class GetDataTask extends AsyncTask<Void,Void,String>{

        /**
         * 此處進行異步操作
         */
        @Override
        protected String doInBackground(Void... params) {

            //讓程序休眠一秒鐘,以達到延時的效果
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                Toast.makeText(userDefinedList_PulltoreFresh.this,e.getMessage(),Toast.LENGTH_LONG).show();
            }

            //定義一個變量,用來存取要添加的值,當num值大于新加數據的個數時,就不再給值,而是返回空
            String str = "";
            if(num!=strArray.length)
            {
                str = strArray[num];
                num++;
            }

            return str;
        }

        /**
         * 這里是異步操作完,返回的結果,用來修改UI
         * @param backStr   異步返回的結果
         */
        @Override
        protected void onPostExecute(String backStr) {
            //判斷一下,傳過來的值是否為空,如是不為空則進行添加
            if(!backStr.equals("")) {
                listDate.add(backStr);
            }
            pullAdapter.notifyDataSetChanged();
            userDefinedList_pull_refresh_list.onRefreshComplete();
            super.onPostExecute(backStr);
        }
    }
}
    

     4,Adapter文件(pulltorefresh_baseAdapter.java)

     

package com.example.cg.baseAdapter;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.cg.studiotest.R;

import java.util.List;

/**
 * Created by cg on 2015/1/27.
 */
public class pulltorefresh_baseAdapter extends BaseAdapter {

    private LayoutInflater mInflater;
    private List<String> testDate;

    public pulltorefresh_baseAdapter(Context context,List<String> testDate)
    {
        this.mInflater = LayoutInflater.from(context);
        this.testDate = testDate;
    }

    @Override
    public int getCount() {
        return testDate.size();
    }

    @Override
    public Object getItem(int position) {
        return testDate.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        pulltoreItem item;
        if(convertView==null)
        {
            item = new pulltoreItem();
            convertView = mInflater.inflate(R.layout.pulltorefresh_item, null);
            item.txt_pulltorefresh_item_title = (TextView)convertView.findViewById(R.id.txt_pulltorefresh_item_title);
            item.img_pulltorefresh_item_img = (ImageView)convertView.findViewById(R.id.img_pulltorefresh_item_img);

            convertView.setTag(item);
        }
        else
        {
            item = (pulltoreItem)convertView.getTag();

        }

        item.txt_pulltorefresh_item_title.setText(testDate.get(position));
        return convertView;
    }


    public class pulltoreItem
    {
        TextView txt_pulltorefresh_item_title;
        ImageView img_pulltorefresh_item_img;
    }
}

      5,效果圖

     


   

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