PullToRefreshListView刷新下拉加载最简单用法

最新推荐文章于 2024-11-01 15:21:01 发布

PatrickYs

最新推荐文章于 2024-11-01 15:21:01 发布

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本文链接：https://blog.youkuaiyun.com/qq_39801871/article/details/78044734

本文介绍如何使用PullToRefresh库实现在Android应用中上下拉刷新ListView的功能，包括布局配置及代码实现，通过自定义适配器展示数据更新效果。

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导入所需PullToRefreshlibrary包

布局文件

<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"
    tools:context="com.example.androidshangxiala.MainActivity">


    <com.handmark.pulltorefresh.library.PullToRefreshListView
        android:id="@+id/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>

代码文件

import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

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

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

public class MainActivity extends AppCompatActivity {

    private PullToRefreshListView pullToRefreshListView;
    private List<String> list;
    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
        }
    };
    private MyAdapter myAdapter;

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

        pullToRefreshListView = (PullToRefreshListView) findViewById(R.id.pull_refresh_list);

        //默认可以下拉, 设置BOTH后也可以上啦;
        pullToRefreshListView.setMode(PullToRefreshBase.Mode.BOTH);

        initData();

        myAdapter = new MyAdapter();
        pullToRefreshListView.setAdapter(myAdapter);

        pullToRefreshListView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
            //下拉加载
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {

                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        list.add(0,"网吧");
                        myAdapter.notifyDataSetChanged();
                        pullToRefreshListView.onRefreshComplete();
                    }
                },2000);


            }

            //上拉刷新
            @Override
            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {

                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        list.add("您好，范冰冰");
                        pullToRefreshListView.onRefreshComplete();
                    }
                },2000);

                myAdapter.notifyDataSetChanged();

            }
        });
    }

    //初始化组件
    private void initData() {
        list = new ArrayList<>();
        for (int i = 0; i < 15; i++) {
            list.add("杨栓"+i);
        }
    }

    class MyAdapter extends BaseAdapter{

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

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

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

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            TextView textView = new TextView(MainActivity.this);
            textView.setText(list.get(position));
            textView.setTextSize(25);
            return textView;
        }
    }
}