下拉刷新(二)

先看主布局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"
    android:background="@color/white"
    tools:context=".MainActivity" >

    <com.imooc.listviewfrashdemo1.ReFlashListView
        android:id="@+id/listview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@color/white"
        android:cacheColorHint="#00000000"
        android:dividerHeight="5dip" />
</RelativeLayout>

<?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:orientation="vertical" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingBottom="10dip"
        android:paddingTop="10dip" >

        <LinearLayout
            android:id="@+id/layout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:gravity="center"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/tip"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="下拉可以刷新！" />

            <TextView
                android:id="@+id/lastupdate_time"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </LinearLayout>

        <ImageView
            android:id="@+id/arrow"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toLeftOf="@id/layout"
            android:layout_marginRight="20dip"
            android:src="@drawable/pull_to_refresh_arrow" />

        <ProgressBar
            android:id="@+id/progress"
            style="?android:attr/progressBarStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toLeftOf="@id/layout"
            android:layout_marginRight="20dip"
            android:visibility="gone" />
    </RelativeLayout>

</LinearLayout>

item_layout.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="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="60dip"
        android:gravity="center_vertical"
        android:background="@drawable/app_item_bg"
        android:orientation="horizontal" >

        <ImageView
            android:id="@+id/item3_apkiv"
            android:layout_width="50dip"
            android:layout_height="50dip"
            android:background="@drawable/test_icon"
            android:layout_marginLeft="10dip" />

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginLeft="10dip"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/item3_apkname"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="应用程序名字"
                android:textColor="@color/black"
                android:textSize="18dip" />

            <TextView
                android:id="@+id/item3_apkinfo"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="5dip"
                android:text="应用程序信息"
                android:textSize="14dip" />
        </LinearLayout>
        <Button
            android:layout_width="60dip"
            android:layout_height="30dip"
            android:background="@drawable/ic_launcher"
            android:id="@+id/item3_dlbtn"
            android:layout_marginRight="10dip"
            android:text="安装"
            />
    </LinearLayout>

    <TextView
        android:id="@+id/item3_apkdes"
        android:layout_width="fill_parent"
        android:layout_height="30dip"
        android:layout_marginLeft="5dip"
        android:layout_marginRight="5dip"
        android:gravity="center_vertical"
        android:text="应用程序描述"
        android:textSize="14dip" />

</LinearLayout>

接下来看bean类

ApkEntity

package com.imooc.listviewfrashdemo1;

public class ApkEntity {
	private String name;
	private String des;
	private String info;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getDes() {
		return des;
	}

	public void setDes(String des) {
		this.des = des;
	}

	public String getInfo() {
		return info;
	}

	public void setInfo(String info) {
		this.info = info;
	}

}

MainActivity

package com.imooc.listviewfrashdemo1;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;

import com.example.listviewfrashdemo1.R;
import com.imooc.listviewfrashdemo1.ReFlashListView.IReflashListener;

public class MainActivity extends Activity implements IReflashListener {
	ArrayList<ApkEntity> apk_list;
	MyAdapter adapter;
	ReFlashListView listview;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// 加载布局--只有一个listView
		setContentView(R.layout.activity_main);
		// 设置数据
		setData();
		//填充数据
		showList(apk_list);
	}

	/**
	 * 设置数据源
	 */
	private void setData() {
		apk_list = new ArrayList<ApkEntity>();
		for (int i = 0; i < 10; i++) {
			ApkEntity entity = new ApkEntity();
			entity.setName("默认数据");
			entity.setInfo("50w用户");
			entity.setDes("这是一个神奇的应用");
			apk_list.add(entity);
		}
	}

	private void showList(ArrayList<ApkEntity> apk_list) {
		if (adapter == null) {
			listview = (ReFlashListView) findViewById(R.id.listview);
			//为本类设置监听，然后implements IReflashListener
			listview.setInterface(this);
			adapter = new MyAdapter(this, apk_list);
			//如果适配器为null,设置适配器即可
			listview.setAdapter(adapter);
		} else {
			//如果适配器不为null,就更新数据源，进行notifyDataSetChanged()
			adapter.onDateChange(apk_list);
		}
	}

	/**
	 * 实现刷新操作的回调方法
	 */
	@Override
	public void onReflush () {
		Handler handler = new Handler();
		handler.postDelayed(new Runnable() {

			@Override
			public void run() {
				// 获取最新数据
				setReflashData();
				// 通知界面显示
				showList(apk_list);
				// 通知listview 刷新数据完毕！！！！！！！！！！！！！！
				listview.reflashComplete();
			}
		}, 2000);

	}

	private void setReflashData() {
		for (int i = 0; i < 2; i++) {
			ApkEntity entity = new ApkEntity();
			entity.setName("刷新数据");
			entity.setDes("这是一个神奇的应用");
			entity.setInfo("50w用户");
			apk_list.add(0, entity);
		}
	}

}

MyAdapter

package com.imooc.listviewfrashdemo1;

import java.util.ArrayList;

import com.example.listviewfrashdemo1.R;

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

public class MyAdapter extends BaseAdapter {
	ArrayList<ApkEntity> apk_list;
	LayoutInflater inflater;

	public MyAdapter(Context context, ArrayList<ApkEntity> apk_list) {
		this.apk_list = apk_list;
		this.inflater = LayoutInflater.from(context);
	}

	public void onDateChange(ArrayList<ApkEntity> apk_list) {
		this.apk_list = apk_list;
		this.notifyDataSetChanged();
	}

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

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

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

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		ApkEntity entity = apk_list.get(position);
		ViewHolder holder;
		if (convertView == null) {
			holder = new ViewHolder();
			convertView = inflater.inflate(R.layout.item_layout, null);
			holder.name_tv = (TextView) convertView
					.findViewById(R.id.item3_apkname);
			holder.des_tv = (TextView) convertView
					.findViewById(R.id.item3_apkdes);
			holder.info_tv = (TextView) convertView
					.findViewById(R.id.item3_apkinfo);
			convertView.setTag(holder);
		}else{
			holder = (ViewHolder) convertView.getTag();
		}
		holder.name_tv.setText(entity.getName());
		holder.des_tv.setText(entity.getDes());
		holder.info_tv.setText(entity.getInfo());
		return convertView;
	}

	class ViewHolder {
		TextView name_tv;
		TextView des_tv;
		TextView info_tv;
	}
}

ReFlashListView

package com.imooc.listviewfrashdemo1;

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

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
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;

import com.example.listviewfrashdemo1.R;
/**
 * 隐藏头布局--先测量父布局，获取头布局高度，设置padding,然后隐藏头布局，listview在添加头布局
 * 设置监听事件
 * 判断ontouch时间
 * 设置监听加载刷新的数据
 */
public class ReFlashListView extends ListView implements OnScrollListener {
	View header;// 顶部布局文件；
	int headerHeight;// 顶部布局文件的高度；
	int firstVisibleItem;// 当前第一个可见的item的位置；
	int scrollState;// listview 当前滚动状态；
	
	boolean isRemark;// 标记，当前是在listview最顶端摁下的；
	int startY;// 摁下时的Y值；

	int state;// 当前的状态；
	final int NONE = 0;// 正常状态；
	final int PULL = 1;// 提示下拉状态；
	final int RELESE = 2;// 提示释放状态；
	final int REFLASHING = 3;// 刷新状态；
	IReflashListener iReflushListener;//刷新数据的接口
	/**
	 * 三个构造方法，并且初始化视图
	 */
	public ReFlashListView(Context context) {
		super(context);
		initView(context);
	}

	public ReFlashListView(Context context, AttributeSet attrs) {
		super(context, attrs);
		initView(context);
	}

	public ReFlashListView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		initView(context);
	}

	/**
	 * 初始化界面，添加顶部布局文件到 listview
	 */
	private void initView(Context context) {
		LayoutInflater inflater = LayoutInflater.from(context);
		header = inflater.inflate(R.layout.header_layout, null);
		//先测量父布局，不然headerHeight为0
		measureView(header);
		//获取头布局文件的高度
		headerHeight = header.getMeasuredHeight();
		Log.i("tag", "headerHeight = " + headerHeight);
		//隐藏头布局文件
		topPadding(-headerHeight);
		//listview添加头布局
		this.addHeaderView(header);
		//设置滑动监听
		this.setOnScrollListener(this);
	}

	/**
	 * 通知父布局，占用的宽，高；
	 */
	private void measureView(View view) {
		ViewGroup.LayoutParams p = view.getLayoutParams();
		if (p == null) {
			p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
					ViewGroup.LayoutParams.WRAP_CONTENT);
		}
		/**
		 * 因为listView不限制高度。child有多高，listView就给它多高的空间
		 * 但是listView是限制宽度的，所以需要getChildMeasureSpec
		 */
		int width = ViewGroup.getChildMeasureSpec(0, 0, p.width);
		int height;
		//获取itme的高度值
		int tempHeight = p.height;
		if (tempHeight > 0) {
			height = MeasureSpec.makeMeasureSpec(tempHeight,
					MeasureSpec.EXACTLY);
		} else {
			height = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
		}
		view.measure(width, height);
	}

	/**
	 * 设置header 布局 上边距；--站在父布局的角度看待问题
	 */
	private void topPadding(int topPadding) {
		header.setPadding(header.getPaddingLeft(), topPadding,
				header.getPaddingRight(), header.getPaddingBottom());
		header.invalidate();
	}

	/**
	 * 实现接口方法
	 */
	@Override
	public void onScroll(AbsListView view, int firstVisibleItem,
			int visibleItemCount, int totalItemCount) {
		this.firstVisibleItem = firstVisibleItem;
	}

	@Override
	public void onScrollStateChanged(AbsListView view, int scrollState) {
		this.scrollState = scrollState;
	}

	/**
	 * 实现touch方法
	 */
	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		switch (ev.getAction()) {
		/**
		 * 如果手指按下，如果firstVisibleItem == 0就设置标记为true,代表是在最顶端按下的
		 * 并且获取按下的坐标Y轴距离
		 */
		case MotionEvent.ACTION_DOWN:
			if (firstVisibleItem == 0) {
				isRemark = true;
				startY = (int) ev.getY();
			}
			break;

		case MotionEvent.ACTION_MOVE:
			/**
			 * 判断移动过程操作；
			 */
			onMove(ev);
			break;
		case MotionEvent.ACTION_UP:
			if (state == RELESE) {
				state = REFLASHING;
				// 加载最新数据；
				reflashViewByState();
				iReflushListener.onReflush();
			} else if (state == PULL) {
				state = NONE;
				isRemark = false;
				reflashViewByState();
			}
			break;
		}
		return super.onTouchEvent(ev);
	}

	/**
	 * 当手指按下
	 */
	private void onMove(MotionEvent ev) {
		//如果不是在listview在最顶端时候按下的，直接返回，不做处理
		if (!isRemark) {
			return;
		}
		int tempY = (int) ev.getY();
		//获取移动的距离
		int space = tempY - startY;
		//获取最新的头布局的padding值
		int topPadding = space - headerHeight;
		switch (state) {
		/**
		 * 判断刷新箭头的状态值
		 */
		case NONE:
			//如果稍微移动就改成状态是--下拉可以刷新
			if (space > 0) {
				//如果是正常状态，就修改状态为下拉可以刷新
				state = PULL;
				//根据当前状态，改变界面显示；
				reflashViewByState();
			}
			break;
		case PULL:
			//重绘最新的头布局隐藏程度
			topPadding(topPadding);
			//如果比头布局高度还大于30就直接改变状态值
			if (space-headerHeight>  30
					&& scrollState == SCROLL_STATE_TOUCH_SCROLL) {
				//修改状态为--松开可以刷新
				state = RELESE;
				reflashViewByState();
			}
			break;
		case RELESE:
			//重绘最新的头布局隐藏程度
			topPadding(topPadding);
			if (space-headerHeight < 30) {
				//改变状态--下拉可以刷新
				state = PULL;
				reflashViewByState();
			} else if (space <= 0) {
				//当space<=0,即可见的item索引不是0
				state = NONE;
				//还原
				isRemark = false;
				reflashViewByState();
			}
			break;
		}
	}

	/**
	 * 根据当前状态，改变界面显示；
	 */
	private void reflashViewByState() {
		TextView tip = (TextView) header.findViewById(R.id.tip);
		ImageView arrow = (ImageView) header.findViewById(R.id.arrow);
		ProgressBar progress = (ProgressBar) header.findViewById(R.id.progress);
		RotateAnimation anim = new RotateAnimation(0, 180,
				RotateAnimation.RELATIVE_TO_SELF, 0.5f,
				RotateAnimation.RELATIVE_TO_SELF, 0.5f);
		anim.setDuration(500);
		anim.setFillAfter(true);
		RotateAnimation anim1 = new RotateAnimation(180, 0,
				RotateAnimation.RELATIVE_TO_SELF, 0.5f,
				RotateAnimation.RELATIVE_TO_SELF, 0.5f);
		anim1.setDuration(500);
		anim1.setFillAfter(true);
		switch (state) {
		case NONE:
			arrow.clearAnimation();
			topPadding(-headerHeight);
			break;

		case PULL:
			arrow.setVisibility(View.VISIBLE);
			progress.setVisibility(View.GONE);
			tip.setText("下拉可以刷新！");
			arrow.clearAnimation();
			arrow.setAnimation(anim1);
			break;
		case RELESE:
			arrow.setVisibility(View.VISIBLE);
			progress.setVisibility(View.GONE);
			tip.setText("松开可以刷新！");
			arrow.clearAnimation();
			arrow.setAnimation(anim);
			break;
		case REFLASHING:
			topPadding(50);
			arrow.setVisibility(View.GONE);
			progress.setVisibility(View.VISIBLE);
			tip.setText("正在刷新...");
			arrow.clearAnimation();
			break;
		}
	}

	/**
	 * 获取完数据；
	 */
	public void reflashComplete() {
		//将刷新状态还原成正常状态
		state = NONE;
		//还原状态
		isRemark = false;
		reflashViewByState();
		TextView lastupdatetime = (TextView) header
				.findViewById(R.id.lastupdate_time);
		SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日 hh:mm:ss");
		Date date = new Date(System.currentTimeMillis());
		String time = format.format(date);
		lastupdatetime.setText(time);
	}
	
	public void setInterface(IReflashListener iReflushListener){
		this.iReflushListener = iReflushListener;
	}
	/**
	 * 刷新数据接口
	 * @author Administrator
	 */
	public interface IReflashListener{
		public void onReflush();
	}
}

下拉刷新(二)

原文：http://blog.csdn.net/u013210620/article/details/47349049