Android 下拉刷新(刷新布局需用ScrollView包裹)

package com.xmn.util.myview;import android.annotation.SuppressLint;import android.content.Context;import android.graphics.Color;import android.os.Handler;import android.util.AttributeSet;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.ViewTreeObserver;import android.view.ViewTreeObserver.OnPreDrawListener;import android.view.animation.Animation;import android.view.animation.RotateAnimation;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.ScrollView;import android.widget.TextView;import com.xmn.merchant.R;/** * @类名:RefreshLayout * @功能描述:下拉刷新View<br> <li>在xml布局中设置,且被刷新的View必须用ScrollView包裹<br> <li> *                    设置监听:setOnRefreshDataListener<br> <li> *                    开启下拉刷新:setFlag<br> <li>刷新完成,调用方法refreshDataFinish<br> <li> *                    刷新失败,调用方法refreshDataError<br> *                    PS:请单独设置ScrollView背景,刷新布局自动设置的背景颜色为黑色 * @作者:XuanKe'Huang * @时间:2014-10-15 上午9:55:21 * @Copyright 2014 */@SuppressLint({ "InflateParams", "HandlerLeak" })public class RefreshLayout extends LinearLayout {@SuppressLint("NewApi")public RefreshLayout(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);init(context);}public RefreshLayout(Context context, AttributeSet attrs) {super(context, attrs);init(context);}public RefreshLayout(Context context) {super(context);init(context);}/** * 方法名: init *  * 功能描述:初始化 *  * @param context *            上下文对象 * @return void *  *         </br>throws */private void init(Context context) {this.context = context;refreshView = LayoutInflater.from(context).inflate(R.layout.view_refreshlayout, null);addView(refreshView);refreshImageView = (ImageView) refreshView.findViewById(R.id.imageview_refresh);refreshTextView = (TextView) refreshView.findViewById(R.id.textview_refresh);/** * 设置布局监听,当布局完完成了以后,首先要隐藏头部 */ViewTreeObserver observer = getViewTreeObserver();observer.addOnPreDrawListener(new OnPreDrawListener() {@Overridepublic boolean onPreDraw() {if (refreshView.getHeight() > tmpHeight) {tmpHeight = refreshView.getHeight();setPadding(0, -tmpHeight, 0, 0);}return true;}});setBackgroundColor(Color.BLACK);}private Context context;// 上下文对象private View refreshView;// 刷新的Layoutprivate ScrollView scrollView;// 滚动视图private ImageView refreshImageView;// 刷新图片private TextView refreshTextView;// 刷新提示private int startY = 0;// 开始点private int moveDistance = 0;// 移动的距离private int tmpHeight = 0;// 刷新的View的等矿山private boolean flag = false;// 是否可以下拉刷新.默认无法下拉刷新,需要设置private boolean ifMove = false;// 是否有移动private RefreshDataListener listener;@Overridepublic boolean dispatchTouchEvent(MotionEvent ev) {switch (ev.getAction()) {case MotionEvent.ACTION_DOWN:// 手指按下startY = (int) ev.getRawY();break;case MotionEvent.ACTION_MOVE:// 手指移动if (flag) {// 只有设置为true的时候才可以下拉刷新ifMove = true;// 手指有移动moveDistance = (int) (ev.getRawY() - startY);if (scrollView.getScrollY() == 0 && moveDistance > 50) {// ScrollView滚动到了顶部if (moveDistance > refreshView.getHeight()) {// 下拉的高度超过的了下拉刷新Layout的高度,就提示可以放手了refreshImageView.setImageResource(R.drawable.finger_up);refreshTextView.setText("松手刷新");}setPadding(0, tmpHeight + (int) ((moveDistance - 50) / 4),0, 0);return true;// 吸收掉手势}} else {// 如果不为true,需要得到当前移动点作为初始点(这个主要为了当View一开始没有滚动到顶部,但是在下拉的过程中滚动了顶部所做的处理)startY = (int) ev.getRawY();}break;case MotionEvent.ACTION_UP:// 手指离开if (ifMove) {// 必须移动(判断这个已经默认可以下拉刷新)ifMove = false;// 重置为没有移动if (moveDistance > tmpHeight) {// 如果下拉的高度超过了Layout的高度,就显示正在刷新,并开始执行刷新refreshImageView.setImageResource(R.drawable.progress_wait);refreshTextView.setText("正在刷新...");setPadding(0, 0, 0, 0);listener.startReLoadData();stop = false;// 开启刷新动画handler.sendEmptyMessage(10087);// 开启刷新动画} else {// 下拉高度不足,重新隐藏界面setPadding(0, -refreshView.getHeight(), 0, 0);}startY = 0;// 把接触点重置为0moveDistance = 0;// 把距离重新设置为0return true;// 吸收掉手势}moveDistance = 0;// 把距离重新设置为0startY = 0;// 把接触点重置为0break;}return super.dispatchTouchEvent(ev);}/** * 方法名: setOnRefreshDataListener *  * 功能描述:设置监听 *  * @param listener *            监听回调 * @param scrollView *            要刷新的ScrollView * @return void *  *         </br>throws */public void setOnRefreshDataListener(RefreshDataListener listener,ScrollView scrollView) {this.listener = listener;this.scrollView = scrollView;}/** * 方法名: refreshDataFinish *  * 功能描述:数据完成,可调用次方法,隐藏刷新Layout *  * @return void *  *         </br>throws */public void refreshDataFinish() {handler.sendEmptyMessage(10088);// 停止动画refreshImageView.setImageResource(R.drawable.enter);refreshTextView.setText("刷新完成");handler.sendEmptyMessageDelayed(10086, 2000);}/** * 方法名: refreshDataError *  * 功能描述:刷新失败 *  * @return void *  *         </br>throws */public void refreshDataError() {handler.sendEmptyMessage(10088);// 停止动画refreshImageView.setImageResource(R.drawable.enter);refreshTextView.setText("刷新失败");handler.sendEmptyMessageDelayed(10086, 2000);}/** * 方法名: refreshDataError *  * 功能描述:刷新失败 *  * @param content *            刷新失败的提示内容 * @return void *  *         </br>throws */public void refreshDataError(String content) {handler.sendEmptyMessage(10088);// 停止动画refreshImageView.setImageResource(R.drawable.enter);refreshTextView.setText(content);handler.sendEmptyMessageDelayed(10086, 2500);}/** * 方法名: setFlag *  * 功能描述:设置是否禁止下拉刷新 *  * @param flag * @return void *  *         </br>throws */public void setFlag(boolean flag) {this.flag = flag;}/** * @类名:RefreshDataListener * @功能描述:刷新数据监听接口 * @作者:XuanKe'Huang * @时间:2014-10-15 下午2:42:20 * @Copyright 2014 */public interface RefreshDataListener {/** * 方法名: startReLoadData *  * 功能描述:开始刷新数据 *  * @return void *  *         </br>throws */public void startReLoadData();}private boolean stop = false;// 停止动画private Handler handler = new Handler() {public void handleMessage(android.os.Message msg) {switch (msg.what) {case 10088:// 刷新完成,停止动画stop = true;refreshImageView.clearAnimation();case 10087:// 正在刷新,启动动画if (!stop) {Animation animation = new RotateAnimation(0, 360,Animation.RELATIVE_TO_SELF, 0.5f,Animation.RELATIVE_TO_SELF, 0.5f);animation.setDuration(2000);refreshImageView.startAnimation(animation);handler.sendEmptyMessageDelayed(10087, 2000);}break;case 10086:// 隐藏界面stop = false;refreshImageView.setImageResource(R.drawable.finger_move);refreshTextView.setText("下拉刷新");setPadding(0, -refreshView.getHeight(), 0, 0);// 重新隐藏下拉刷新界面scrollView.scrollTo(0, 0);break;}};};}