.Net 转战 Android 4.4 日常笔记（10）--PullToRefresh下拉刷新使用

下拉刷新很多地方都用到了，新浪微博，微信，百度新闻

这里我们使用一个开源的库叫：PullToRefresh

开源地址：https://github.com/chenyoca/pull-to-refresh

下载地址：https://github.com/chenyoca/pull-to-refresh/archive/master.zip

解压代码之后通过ecplise导入到项目里面

导入之后可能会出现库路径引用错误

在项目右键，依次对库进行修正

运行主Activity

这时就可以看到效果了！接下来我们自己创建一个项目来使用这个控件

新建一个项目UsingPullToRefresh

创建之后要对库进行引用，这有点像C#工程一样，要对程序集进行引用（3个库都要引用）

引用完之后会报出一个jar版本不同的错误

所以我们要让库和我们的工程的版本一致

拷贝libs下的android-support-v4.jar

分别复制到刚引用的3个库中替换libs下的android-support-v4.jar

修改一下MianActivity.java和activity_main.xml的代码

package com.example.usingpulltorefresh;

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

import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;
import com.handmark.pulltorefresh.library.PullToRefreshListView;

import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.os.Build;

public class MainActivity extends Activity {

    private PullToRefreshListView lv;
    private ArrayAdapter<String> adapter;
    private List<String> list;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //查找到控件
        lv = (PullToRefreshListView) findViewById(R.id.lv);
        list= new ArrayList<String>();
        list.add("香蕉");
        list.add("苹果");

        adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,list);
        lv.setAdapter(adapter);

        lv.setOnRefreshListener(new OnRefreshListener<ListView>(){
            @Override
            public void onRefresh(PullToRefreshBase<ListView> refreshView) {
                // TODO Auto-generated method stub
                new AsyncTask<Void,Void,Void>(){
                    @Override
                    protected Void doInBackground(Void... arg0) {
                        // TODO Auto-generated method stub
                        try {
                            Thread.sleep();
                        } catch (InterruptedException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                        return null;
                    }

                    protected void onPostExecute(Void result){
                        adapter.addAll("西瓜","橙子","火龙果");
                        lv.onRefreshComplete();
                    }

                }.execute();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

}

MainActivity

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.usingpulltorefresh.MainActivity"
    tools:ignore="MergeRootFrame" >
    <com.handmark.pulltorefresh.library.PullToRefreshListView
        android:id="@+id/lv"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        >
    </com.handmark.pulltorefresh.library.PullToRefreshListView>
</LinearLayout>

activity_main

OK，可以运行了！

直接下载源码：http://pan.baidu.com/s/1mgKBkrI