自定义下拉刷新上拉加载View

MainActivity.java

package com.heima52.pullrefresh;

import java.util.ArrayList;

import com.heima52.pullrefresh.view.RefreshListView;
import com.heima52.pullrefresh.view.RefreshListView.OnRefreshListener;

import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.Window;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class MainActivity extends Activity {
    private RefreshListView refreshListView;

    private ArrayList<String> list = new ArrayList<String>();

    private MyAdapter adapter;

    private Handler handler = new Handler(){
        public void handleMessage(android.os.Message msg) {
            //更新UI
            adapter.notifyDataSetChanged();
            refreshListView.completeRefresh();
        };
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initView();
        initData();
    }

    private void initView() {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        refreshListView = (RefreshListView) findViewById(R.id.refreshListView);
    }

    private void initData() {
        for (int i = 0; i < 15; i++) {
            list.add("listview原来的数据 - "+i);
        }


        /**
         * 填充对象时候是异步的所以有时候getheight有可能是0
         */
//      final View headerView = View.inflate(this, R.layout.layout_header, null);
        //第一种方法
//      headerView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
//          @Override
//          public void onGlobalLayout() {
//              headerView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
//              int headerViewHeight = headerView.getHeight();
//              
//              
//              Log.e("MainActivity", "headerViewHeight: "+headerViewHeight);
//              headerView.setPadding(0, -headerViewHeight, 0, 0);
//              refreshListView.addHeaderView(headerView);//
//          }
//      });
        //第二种方法 
//      headerView.measure(0, 0);//主动通知系统去测量
//      int headerViewHeight = headerView.getMeasuredHeight();
//      Log.e("MainActivity", "headerViewHeight: "+headerViewHeight);
//      headerView.setPadding(0, -headerViewHeight, 0, 0);
//      refreshListView.addHeaderView(headerView);//



        adapter = new MyAdapter();
        refreshListView.setAdapter(adapter);

        refreshListView.setOnRefreshListener(new OnRefreshListener() {
            @Override
            public void onPullRefresh() {
                //需要联网请求服务器的数据，然后更新UI
                requestDataFromServer(false);
            }

            @Override
            public void onLoadingMore() {
                requestDataFromServer(true);
            }
        });

    }
    /**
     * 模拟向服务器请求数据
     */
    private void requestDataFromServer(final boolean isLoadingMore){
        new Thread(){
            public void run() {
                SystemClock.sleep(3000);//模拟请求服务器的一个时间长度

                if(isLoadingMore){
                    list.add("加载更多的数据-1");
                    list.add("加载更多的数据-2");
                    list.add("加载更多的数据-3");
                }else {
                    list.add(0, "下拉刷新的数据");
                }

                //在UI线程更新UI
                handler.sendEmptyMessage(0);
            };
        }.start();
    }

    class MyAdapter extends BaseAdapter{
        @Override
        public int getCount() {
            return list.size();
        }
        @Override
        public Object getItem(int position) {
            return null;
        }
        @Override
        public long getItemId(int position) {
            return 0;
        }
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            TextView textView = new TextView(MainActivity.this);
            textView.setPadding(20, 20, 20, 20);
            textView.setTextSize(18);

            textView.setText(list.get(position));

            return textView;
        }

    }

}

RefreshListView.java

package com.heima52.pullrefresh.view;

import java.text.SimpleDateFormat;
import java.util.Date;

import com.heima52.pullrefresh.R;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

public class RefreshListView extends ListView implements OnScrollListener{

    private View headerView;//headerView
    private ImageView iv_arrow;
    private ProgressBar pb_rotate;
    private TextView tv_state,tv_time;
    private View footerView;
    private int footerViewHeight;

    private int headerViewHeight;//headerView高

    private int downY;//按下时y坐标

    private final int PULL_REFRESH = 0;//下拉刷新的状态
    private final int RELEASE_REFRESH = 1;//松开刷新的状态
    private final int REFRESHING = 2;//正在刷新的状态
    private int currentState = PULL_REFRESH;

    private RotateAnimation upAnimation,downAnimation;

    private boolean isLoadingMore = false;//当前是否正在处于加载更多

    public RefreshListView(Context context) {
        super(context);
        init();
    }

    public RefreshListView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init(){
        setOnScrollListener(this);
        initHeaderView();
        initRotateAnimation();
        initFooterView();
    }


    /**
     * 初始化headerView
     */
    private void initHeaderView() {
        headerView = View.inflate(getContext(), R.layout.layout_header, null);
        iv_arrow = (ImageView) headerView.findViewById(R.id.iv_arrow);
        pb_rotate = (ProgressBar) headerView.findViewById(R.id.pb_rotate);
        tv_state = (TextView) headerView.findViewById(R.id.tv_state);
        tv_time = (TextView) headerView.findViewById(R.id.tv_time);

        headerView.measure(0, 0);//主动通知系统去测量该view;
        headerViewHeight = headerView.getMeasuredHeight();
        headerView.setPadding(0, -headerViewHeight, 0, 0);

        addHeaderView(headerView);


    }

    /**
     * 初始化旋转动画
     */
    private void initRotateAnimation() {
        upAnimation = new RotateAnimation(0, -180, 
                RotateAnimation.RELATIVE_TO_SELF, 0.5f,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        upAnimation.setDuration(300);
        upAnimation.setFillAfter(true);
        downAnimation = new RotateAnimation(-180, -360, 
                RotateAnimation.RELATIVE_TO_SELF, 0.5f,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        downAnimation.setDuration(300);
        downAnimation.setFillAfter(true);
    }

    private void initFooterView() {
        footerView = View.inflate(getContext(), R.layout.layout_footer, null);
        footerView.measure(0, 0);//主动通知系统去测量该view;
        footerViewHeight = footerView.getMeasuredHeight();
        footerView.setPadding(0, -footerViewHeight, 0, 0);
        addFooterView(footerView);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            downY = (int) ev.getY();
            break;
        case MotionEvent.ACTION_MOVE:

            if(currentState==REFRESHING){
                break;
            }

            int deltaY = (int) (ev.getY() - downY);

            int paddingTop = -headerViewHeight + deltaY;
            if(paddingTop>-headerViewHeight && getFirstVisiblePosition()==0){
                headerView.setPadding(0, paddingTop, 0, 0);
//              Log.e("RefreshListView", "paddingTop: "+paddingTop);

                if(paddingTop>=0 && currentState==PULL_REFRESH){
                    //从下拉刷新进入松开刷新状态
                    currentState = RELEASE_REFRESH;
                    refreshHeaderView();
                }else if (paddingTop<0 && currentState==RELEASE_REFRESH) {
                    //进入下拉刷新状态
                    currentState = PULL_REFRESH;
                    refreshHeaderView();
                }


                return true;//拦截TouchMove，不让listview处理该次move事件,会造成listview无法滑动
            }


            break;
        case MotionEvent.ACTION_UP:
            if(currentState==PULL_REFRESH){
                //隐藏headerView
                headerView.setPadding(0, -headerViewHeight, 0, 0);
            }else if (currentState==RELEASE_REFRESH) {
                headerView.setPadding(0, 0, 0, 0);
                currentState = REFRESHING;
                refreshHeaderView();

                if(listener!=null){
                    listener.onPullRefresh();
                }
            }
            break;
        }
        return super.onTouchEvent(ev);
    }

    /**
     * 根据currentState来更新headerView
     */
    private void refreshHeaderView(){
        switch (currentState) {
        case PULL_REFRESH:
            tv_state.setText("下拉刷新");
            iv_arrow.startAnimation(downAnimation);
            break;
        case RELEASE_REFRESH:
            tv_state.setText("松开刷新");
            iv_arrow.startAnimation(upAnimation);
            break;
        case REFRESHING:
            iv_arrow.clearAnimation();//因为向上的旋转动画有可能没有执行完
            iv_arrow.setVisibility(View.INVISIBLE);
            pb_rotate.setVisibility(View.VISIBLE);
            tv_state.setText("正在刷新...");
            break;
        }
    }

    /**
     * 完成刷新操作，重置状态,在你获取完数据并更新完adater之后，去在UI线程中调用该方法
     */
    public void completeRefresh(){
        if(isLoadingMore){
            //重置footerView状态
            footerView.setPadding(0, -footerViewHeight, 0, 0);
            isLoadingMore = false;
        }else {
            //重置headerView状态
            headerView.setPadding(0, -headerViewHeight, 0, 0);
            currentState = PULL_REFRESH;
            pb_rotate.setVisibility(View.INVISIBLE);
            iv_arrow.setVisibility(View.VISIBLE);
            tv_state.setText("下拉刷新");
            tv_time.setText("最后刷新："+getCurrentTime());
        }
    }

    /**
     * 获取当前系统时间，并格式化
     * @return
     */
    private String getCurrentTime(){
        SimpleDateFormat format = new SimpleDateFormat("yy-MM-dd HH:mm:ss");
        return format.format(new Date());
    }

    private OnRefreshListener listener;
    public void setOnRefreshListener(OnRefreshListener listener){
        this.listener = listener;
    }
    public interface OnRefreshListener{
        void onPullRefresh();
        void onLoadingMore();
    }

    /**
     * SCROLL_STATE_IDLE:闲置状态，就是手指松开
     * SCROLL_STATE_TOUCH_SCROLL：手指触摸滑动，就是按着来滑动
     * SCROLL_STATE_FLING：快速滑动后松开
     */
    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        if(scrollState==OnScrollListener.SCROLL_STATE_IDLE 
                && getLastVisiblePosition()==(getCount()-1) &&!isLoadingMore){
            isLoadingMore = true;

            footerView.setPadding(0, 0, 0, 0);//显示出footerView
            setSelection(getCount());//让listview最后一条显示出来

            if(listener!=null){
                listener.onLoadingMore();
            }
        }
    }
    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,
            int visibleItemCount, int totalItemCount) {
    }

}

indeterminate_drawable.xml

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android" 
    android:fromDegrees="0"
    android:pivotX="50%"
    android:pivotY="50%"
    android:drawable="@drawable/indicate_rotate"
    android:toDegrees="360">


</rotate>

activity_main.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"
    tools:context=".MainActivity" >

    <com.heima52.pullrefresh.view.RefreshListView
        android:id="@+id/refreshListView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </com.heima52.pullrefresh.view.RefreshListView>

</RelativeLayout>

layout_footer.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="wrap_content"
    android:gravity="center"
    android:orientation="horizontal" >

    <ProgressBar
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:indeterminate="true"
        android:indeterminateDrawable="@drawable/indeterminate_drawable"
        android:indeterminateDuration="1000" />

    <TextView android:layout_width="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:layout_height="wrap_content"
        android:textColor="#aa000000"
        android:layout_marginLeft="15dp"
        android:textSize="20sp"
        android:text="加载更多..."/>
</LinearLayout>

layout_header.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="wrap_content"
    android:gravity="center_horizontal"
    android:orientation="horizontal" >

    <RelativeLayout android:layout_width="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:layout_height="wrap_content">

        <ImageView android:layout_width="wrap_content"
            android:layout_centerInParent="true"
            android:id="@+id/iv_arrow"
            android:background="@drawable/indicator_arrow"
            android:layout_height="wrap_content"/>

        <ProgressBar android:layout_width="30dp"
            android:layout_centerInParent="true"
            android:layout_height="30dp"
            android:visibility="invisible"
            android:id="@+id/pb_rotate"
            android:indeterminateDuration="1000"
            android:indeterminateDrawable="@drawable/indeterminate_drawable"
            />

    </RelativeLayout>

    <LinearLayout android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:gravity="center"
        android:layout_marginLeft="15dp"
        android:orientation="vertical">
        <TextView android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20sp"
            android:id="@+id/tv_state"
            android:textColor="#aa000000"
            android:text="下拉刷新"/>
        <TextView android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="14sp"
            android:id="@+id/tv_time"
            android:textColor="@android:color/darker_gray"
            android:text="最后刷新："/>

    </LinearLayout>

</LinearLayout>