android下拉刷新和滑动到底部加载更多，自定义listview

Posted 2022-12-03 猫叔聊技术

首先需要自定义listview：RefreshListView.java

package com.example.push.view;

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

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
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.push.R;

public class RefreshListView extends ListView implements OnScrollListener 

	private View headerView;
	private ImageView iv_arrow;
	private ProgressBar pb_rotate;
	private TextView tv_state;
	private TextView tv_time;
	private int downY;
	private int headerViewHeight;

	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;

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

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

	private void init() 
		setOnScrollListener(this);
		initHeaderView();
		initAnimation();
		initFooterView();
	

	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view
		headerViewHeight = headerView.getMeasuredHeight();
		headerView.setPadding(0, -headerViewHeight, 0, 0);
		addHeaderView(headerView);
	

	/**
	 * 初始化旋转动画
	 */
	private void initAnimation() 
		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);
		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;
			// paddingTop大于等于-headerview高度的时候才开始设置出现以及显示第一个的时候
			if (paddingTop > -headerViewHeight
					&& getFirstVisiblePosition() == 0) 
				headerView.setPadding(0, paddingTop, 0, 0);
				if (paddingTop >= 0 && currentState == PULL_REFRESH) 
					// 从下拉刷新进入松开刷新
					currentState = RELEASE_REFRESH;
					refreshHeaderView();
				 else if (paddingTop < 0 && currentState == RELEASE_REFRESH) 
					// 从松开刷新进入下拉刷新
					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) 
				// 隐藏头部
				headerView.setPadding(0, -headerViewHeight, 0, 0);
			 else if (currentState == RELEASE_REFRESH) 
				headerView.setPadding(0, 0, 0, 0);
				currentState = REFRESHING;
				refreshHeaderView();

				// new Handler().postDelayed(new Runnable() 
				//
				// @Override
				// public void run() 
				// completeRefresh();
				// 
				//
				// , 3000);
				if (onRefreshListener != null) 
					onRefreshListener.onPullRefresh();

				

			

			break;
		
		return super.onTouchEvent(ev);
	

	/**
	 * 根据currentstate更新ui
	 */
	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) 
			isLoadingMore = false;
			footerView.setPadding(0, -footerViewHeight, 0, 0);
		 else 
			// 重置headerview状态
			currentState = PULL_REFRESH;
			headerView.setPadding(0, -headerViewHeight, 0, 0);
			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());
		

	

	/**
	 * 获取当前时间并格式化
	 * 
	 * @return
	 */

	private String getCurrentTime() 
		SimpleDateFormat sdf = new SimpleDateFormat("yy-MM-dd HH:mm:ss");
		String currentTime = sdf.format(new Date());
		return currentTime;
	

	private OnRefreshListener onRefreshListener;
	private View footerView;
	private int footerViewHeight;
	private boolean isLoadingMore = false;

	public void setOnRefreshListener(OnRefreshListener onRefreshListener) 
		this.onRefreshListener = onRefreshListener;
	

	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);
			setSelection(getCount());
			if (onRefreshListener != null) 
				onRefreshListener.onLoadingMore();
			
		
	

	@Override
	public void onScroll(AbsListView view, int firstVisibleItem,
			int visibleItemCount, int totalItemCount) 

	

mainactivity中的代码：

package com.example.push;

import java.util.ArrayList;

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

import com.example.push.view.RefreshListView;
import com.example.push.view.RefreshListView.OnRefreshListener;

public class MainActivity extends Activity 
	private RefreshListView refreshListView;
	private ArrayList<String> lists = 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.refresh_listview);
	

	private void initData() 
		for (int i = 0; i < 25; i++) 
			lists.add("listview原来的数据-" + i);
		

		final View headerView = View
				.inflate(this, R.layout.layout_header, null);
		// 测量，布局，绘制
		// 在oncreate中View.getWidth和View.getHeight无法获得一个view的高度和宽度，这是因为View组件布局要在onResume回调后完成
		// 第一种方法
		// headerView.getViewTreeObserver().addOnGlobalLayoutListener(new
		// OnGlobalLayoutListener() 
		//
		// @Override
		// public void onGlobalLayout() 
		// headerView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
		// int headerViewHeight=headerView.getHeight();
		// 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();
		// headerView.setPadding(0, -headerViewHeight, 0, 0);
		// refreshListView.addHeaderView(headerView);

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

			@Override
			public void onPullRefresh() 
				// Log.e("lalal","进入");
				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);
				if(isLoadingMore)
					lists.add("加载更多的数据-1");
					lists.add("加载更多的数据-2");
					lists.add("加载更多的数据-3");
				else
					lists.add(0, "下拉刷新的数据");
				
				
				handler.sendEmptyMessage(0);
			;
		.start();
	

	class MyAdapter extends BaseAdapter 

		@Override
		public int getCount() 
			return lists.size();
		

		@Override
		public Object getItem(int position) 
			return lists.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.setPadding(20, 20, 20, 20);
			textView.setTextSize(18);
			textView.setText(lists.get(position));
			return textView;
		

	

全部源码: https://github.com/xh2015/RefreshListView.git