package safeluck.drive.evaluation.customview;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.Timer;
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import java.util.TimerTask;
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import android.content.Context;
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import android.os.Handler;
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import android.os.Message;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.animation.AnimationUtils;
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import android.view.animation.LinearInterpolator;
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import android.view.animation.RotateAnimation;
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import android.widget.RelativeLayout;
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import android.widget.TextView;
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import safeluck.drive.evaluation.R;
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/**
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* 自定义的布局，用来管理三个子控件，其中一个是下拉头，一个是包含内容的pullableView（可以是实现Pullable接口的的任何View），
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* 还有一个上拉头，更多详解见博客http://blog.csdn.net/zhongkejingwang/article/details/38868463
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*
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* @author 陈靖
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*/
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public class PullToRefreshLayout extends RelativeLayout {
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public static final String TAG = "PullToRefreshLayout";
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/**
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* last y
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*/
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private int mLastMotionY;
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/**
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* last x
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*/
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private int mLastMotionX;
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// 初始状态
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public static final int INIT = 0;
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// 释放刷新
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public static final int RELEASE_TO_REFRESH = 1;
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// 正在刷新
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public static final int REFRESHING = 2;
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// 释放加载
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public static final int RELEASE_TO_LOAD = 3;
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// 正在加载
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public static final int LOADING = 4;
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// 操作完毕
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public static final int DONE = 5;
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// 当前状态
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private int state = INIT;
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// 刷新回调接口
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private OnRefreshListener mListener;
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// 刷新成功
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public static final int SUCCEED = 0;
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// 刷新失败
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public static final int FAIL = 1;
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// 按下Y坐标，上一个事件点Y坐标
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private float downY, lastY;
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// 下拉的距离。注意：pullDownY和pullUpY不可能同时不为0
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public float pullDownY = 0;
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// 上拉的距离
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private float pullUpY = 0;
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// 释放刷新的距离
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private float refreshDist = 200;
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// 释放加载的距离
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private float loadmoreDist = 200;
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private MyTimer timer;
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// 回滚速度
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public float MOVE_SPEED = 8;
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// 第一次执行布局
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private boolean isLayout = false;
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// 在刷新过程中滑动操作
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private boolean isTouch = false;
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// 手指滑动距离与下拉头的滑动距离比，中间会随正切函数变化
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private float radio = 2;
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// 下拉箭头的转180°动画
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private RotateAnimation rotateAnimation;
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// 均匀旋转动画
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private RotateAnimation refreshingAnimation;
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// 下拉头
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private View refreshView;
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// 下拉的箭头
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private View pullView;
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// 正在刷新的图标
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private View refreshingView;
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// 刷新结果图标
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private View refreshStateImageView;
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// 刷新结果：成功或失败
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private TextView refreshStateTextView;
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// 上拉头
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private View loadmoreView;
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// 上拉的箭头
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private View pullUpView;
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// 正在加载的图标
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private View loadingView;
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// 加载结果图标
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private View loadStateImageView;
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// 加载结果：成功或失败
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private TextView loadStateTextView;
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// 实现了Pullable接口的View
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private View pullableView;
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// 过滤多点触碰
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private int mEvents;
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// 这两个变量用来控制pull的方向，如果不加控制，当情况满足可上拉又可下拉时没法下拉
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private boolean canPullDown = true;
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private boolean canPullUp = true;
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/**
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* 执行自动回滚的handler
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*/
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Handler updateHandler = new Handler() {
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@Override
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public void handleMessage(Message msg) {
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// 回弹速度随下拉距离moveDeltaY增大而增大
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MOVE_SPEED = (float) (8 + 5 * Math.tan(Math.PI / 2
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/ getMeasuredHeight() * (pullDownY + Math.abs(pullUpY))));
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if (!isTouch) {
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// 正在刷新，且没有往上推的话则悬停，显示"正在刷新..."
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if (state == REFRESHING && pullDownY <= refreshDist) {
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pullDownY = refreshDist;
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timer.cancel();
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} else if (state == LOADING && -pullUpY <= loadmoreDist) {
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pullUpY = -loadmoreDist;
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timer.cancel();
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}
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}
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if (pullDownY > 0)
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pullDownY -= MOVE_SPEED;
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else if (pullUpY < 0)
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pullUpY += MOVE_SPEED;
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if (pullDownY < 0) {
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// 已完成回弹
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pullDownY = 0;
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pullView.clearAnimation();
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// 隐藏下拉头时有可能还在刷新，只有当前状态不是正在刷新时才改变状态
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if (state != REFRESHING && state != LOADING)
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changeState(INIT);
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timer.cancel();
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}
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if (pullUpY > 0) {
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// 已完成回弹
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pullUpY = 0;
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pullUpView.clearAnimation();
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// 隐藏下拉头时有可能还在刷新，只有当前状态不是正在刷新时才改变状态
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if (state != REFRESHING && state != LOADING)
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changeState(INIT);
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timer.cancel();
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}
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// 刷新布局,会自动调用onLayout
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requestLayout();
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}
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};
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public void setOnRefreshListener(OnRefreshListener listener) {
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mListener = listener;
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}
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public PullToRefreshLayout(Context context) {
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super(context);
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initView(context);
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}
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public PullToRefreshLayout(Context context, AttributeSet attrs) {
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super(context, attrs);
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initView(context);
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}
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public PullToRefreshLayout(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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initView(context);
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}
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private void initView(Context context) {
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timer = new MyTimer(updateHandler);
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rotateAnimation = (RotateAnimation) AnimationUtils.loadAnimation(
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context, R.anim.reverse_anim);
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refreshingAnimation = (RotateAnimation) AnimationUtils.loadAnimation(
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context, R.anim.rotating);
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// 添加匀速转动动画
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LinearInterpolator lir = new LinearInterpolator();
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rotateAnimation.setInterpolator(lir);
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refreshingAnimation.setInterpolator(lir);
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}
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private void hide() {
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timer.schedule(5);
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}
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/**
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* 完成刷新操作，显示刷新结果。注意：刷新完成后一定要调用这个方法
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*/
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/**
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* @param refreshResult
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* PullToRefreshLayout.SUCCEED代表成功，PullToRefreshLayout.FAIL代表失败
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*/
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public void refreshFinish(int refreshResult) {
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refreshingView.clearAnimation();
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refreshingView.setVisibility(View.GONE);
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switch (refreshResult) {
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case SUCCEED:
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// 刷新成功
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SimpleDateFormat format = new SimpleDateFormat(
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"yyyy-MM-dd HH:mm:ss");
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refreshStateImageView.setVisibility(View.VISIBLE);
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refreshStateTextView.setText("刷新成功 "+format
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.format(new Date()));
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// refreshStateTextView.setText(R.string.refresh_succeed+format
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// .format(new Date()));
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refreshStateImageView
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.setBackgroundResource(R.drawable.allview_refresh_succeed);
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break;
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case FAIL:
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default:
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// 刷新失败
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refreshStateImageView.setVisibility(View.VISIBLE);
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refreshStateTextView.setText(R.string.refresh_fail);
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refreshStateImageView
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.setBackgroundResource(R.drawable.allview_refresh_failed);
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break;
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}
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// 刷新结果停留1秒
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new Handler() {
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@Override
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public void handleMessage(Message msg) {
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changeState(DONE);
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hide();
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}
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}.sendEmptyMessageDelayed(0, 1000);
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}
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/**
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* 加载完毕，显示加载结果。注意：加载完成后一定要调用这个方法
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*
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* @param refreshResult
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* PullToRefreshLayout.SUCCEED代表成功，PullToRefreshLayout.FAIL代表失败
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*/
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public void loadmoreFinish(int refreshResult) {
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loadingView.clearAnimation();
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loadingView.setVisibility(View.GONE);
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switch (refreshResult) {
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case SUCCEED:
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// 加载成功
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loadStateImageView.setVisibility(View.VISIBLE);
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loadStateTextView.setText(R.string.load_succeed);
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loadStateImageView
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.setBackgroundResource(R.drawable.allview_load_succeed);
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break;
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case FAIL:
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default:
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// 加载失败
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loadStateImageView.setVisibility(View.VISIBLE);
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loadStateTextView.setText(R.string.load_fail);
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loadStateImageView
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.setBackgroundResource(R.drawable.allview_load_failed);
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break;
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}
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// 刷新结果停留1秒
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new Handler() {
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@Override
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public void handleMessage(Message msg) {
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changeState(DONE);
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hide();
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}
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}.sendEmptyMessageDelayed(0, 1000);
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}
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private void changeState(int to) {
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state = to;
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switch (state) {
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case INIT:
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// 下拉布局初始状态
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refreshStateImageView.setVisibility(View.GONE);
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refreshStateTextView.setText(R.string.pull_to_refresh);
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pullView.clearAnimation();
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pullView.setVisibility(View.VISIBLE);
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// 上拉布局初始状态
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loadStateImageView.setVisibility(View.GONE);
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loadStateTextView.setText(R.string.pullup_to_load);
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pullUpView.clearAnimation();
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pullUpView.setVisibility(View.VISIBLE);
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break;
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case RELEASE_TO_REFRESH:
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// 释放刷新状态
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refreshStateTextView.setText(R.string.release_to_refresh);
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pullView.startAnimation(rotateAnimation);
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break;
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case REFRESHING:
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// 正在刷新状态
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pullView.clearAnimation();
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refreshingView.setVisibility(View.VISIBLE);
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pullView.setVisibility(View.INVISIBLE);
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refreshingView.startAnimation(refreshingAnimation);
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refreshStateTextView.setText(R.string.refreshing);
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break;
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case RELEASE_TO_LOAD:
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// 释放加载状态
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loadStateTextView.setText(R.string.release_to_load);
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pullUpView.startAnimation(rotateAnimation);
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break;
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case LOADING:
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// 正在加载状态
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pullUpView.clearAnimation();
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loadingView.setVisibility(View.VISIBLE);
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pullUpView.setVisibility(View.INVISIBLE);
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loadingView.startAnimation(refreshingAnimation);
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loadStateTextView.setText(R.string.loading);
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break;
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case DONE:
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// 刷新或加载完毕，啥都不做
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break;
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}
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}
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/**
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* 不限制上拉或下拉
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*/
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private void releasePull() {
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canPullDown = true;
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canPullUp = true;
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}
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@Override
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public boolean onInterceptTouchEvent(MotionEvent e) {
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int y = (int) e.getRawY();
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int x = (int) e.getRawX();
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switch (e.getAction()) {
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case MotionEvent.ACTION_DOWN:
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// 首先拦截down事件,记录y坐标
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mLastMotionY = y;
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mLastMotionX = x;
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break;
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case MotionEvent.ACTION_MOVE:
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// deltaY > 0 是向下运动< 0是向上运动
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int deltaY = y - mLastMotionY;
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int deltaX = x - mLastMotionX;
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if (Math.abs(deltaX * 3) > Math.abs(deltaY)) {
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return false;
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}
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case MotionEvent.ACTION_UP:
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case MotionEvent.ACTION_CANCEL:
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break;
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}
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return false;
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}
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/*
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* （非 Javadoc）由父控件决定是否分发事件，防止事件冲突
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*
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* @see android.view.ViewGroup#dispatchTouchEvent(android.view.MotionEvent)
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*/
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@Override
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public boolean dispatchTouchEvent(MotionEvent ev) {
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switch (ev.getActionMasked()) {
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case MotionEvent.ACTION_DOWN:
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downY = ev.getY();
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lastY = downY;
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timer.cancel();
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mEvents = 0;
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releasePull();
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break;
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case MotionEvent.ACTION_POINTER_DOWN:
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case MotionEvent.ACTION_POINTER_UP:
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// 过滤多点触碰
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mEvents = -1;
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break;
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case MotionEvent.ACTION_MOVE:
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if (mEvents == 0) {
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if (((PullInterface) pullableView).canPullDown() && canPullDown
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&& state != LOADING) {
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// 可以下拉，正在加载时不能下拉
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// 对实际滑动距离做缩小，造成用力拉的感觉
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pullDownY = pullDownY + (ev.getY() - lastY) / radio;
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if (pullDownY < 0) {
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pullDownY = 0;
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canPullDown = false;
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canPullUp = true;
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}
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if (pullDownY > getMeasuredHeight())
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pullDownY = getMeasuredHeight();
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if (state == REFRESHING) {
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// 正在刷新的时候触摸移动
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isTouch = true;
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}
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} else if (((PullInterface) pullableView).canPullUp() && canPullUp
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&& state != REFRESHING) {
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// 可以上拉，正在刷新时不能上拉
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pullUpY = pullUpY + (ev.getY() - lastY) / radio;
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if (pullUpY > 0) {
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pullUpY = 0;
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canPullDown = true;
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canPullUp = false;
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}
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if (pullUpY < -getMeasuredHeight())
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pullUpY = -getMeasuredHeight();
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if (state == LOADING) {
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// 正在加载的时候触摸移动
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isTouch = true;
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}
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} else
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releasePull();
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} else
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mEvents = 0;
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lastY = ev.getY();
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// 根据下拉距离改变比例
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radio = (float) (2 + 2 * Math.tan(Math.PI / 2 / getMeasuredHeight()
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* (pullDownY + Math.abs(pullUpY))));
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requestLayout();
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if (pullDownY <= refreshDist && state == RELEASE_TO_REFRESH) {
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// 如果下拉距离没达到刷新的距离且当前状态是释放刷新，改变状态为下拉刷新
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changeState(INIT);
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}
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if (pullDownY >= refreshDist && state == INIT) {
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// 如果下拉距离达到刷新的距离且当前状态是初始状态刷新，改变状态为释放刷新
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changeState(RELEASE_TO_REFRESH);
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}
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// 下面是判断上拉加载的，同上，注意pullUpY是负值
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if (-pullUpY <= loadmoreDist && state == RELEASE_TO_LOAD) {
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changeState(INIT);
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}
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if (-pullUpY >= loadmoreDist && state == INIT) {
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changeState(RELEASE_TO_LOAD);
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}
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// 因为刷新和加载操作不能同时进行，所以pullDownY和pullUpY不会同时不为0，因此这里用(pullDownY +
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// Math.abs(pullUpY))就可以不对当前状态作区分了
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if ((pullDownY + Math.abs(pullUpY)) > 8) {
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// 防止下拉过程中误触发长按事件和点击事件
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ev.setAction(MotionEvent.ACTION_CANCEL);
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}
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break;
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case MotionEvent.ACTION_UP:
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if (pullDownY > refreshDist || -pullUpY > loadmoreDist)
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// 正在刷新时往下拉（正在加载时往上拉），释放后下拉头（上拉头）不隐藏
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isTouch = false;
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if (state == RELEASE_TO_REFRESH) {
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changeState(REFRESHING);
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// 刷新操作
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if (mListener != null)
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mListener.onRefresh(this);
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} else if (state == RELEASE_TO_LOAD) {
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changeState(LOADING);
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// 加载操作
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if (mListener != null)
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mListener.onLoadMore(this);
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}
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hide();
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default:
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break;
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}
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// 事件分发交给父类
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super.dispatchTouchEvent(ev);
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return true;
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}
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private void initView() {
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// 初始化下拉布局
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pullView = refreshView.findViewById(R.id.pull_icon);
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refreshStateTextView = (TextView) refreshView
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.findViewById(R.id.state_tv);
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refreshingView = refreshView.findViewById(R.id.refreshing_icon);
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refreshStateImageView = refreshView.findViewById(R.id.state_iv);
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// 初始化上拉布局
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pullUpView = loadmoreView.findViewById(R.id.pullup_icon);
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loadStateTextView = (TextView) loadmoreView
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.findViewById(R.id.loadstate_tv);
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loadingView = loadmoreView.findViewById(R.id.loading_icon);
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loadStateImageView = loadmoreView.findViewById(R.id.loadstate_iv);
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}
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@Override
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protected void onLayout(boolean changed, int l, int t, int r, int b) {
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if (!isLayout) {
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// 这里是第一次进来的时候做一些初始化
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refreshView = getChildAt(0);
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pullableView = getChildAt(1);
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loadmoreView = getChildAt(2);
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isLayout = true;
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initView();
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refreshDist = ((ViewGroup) refreshView).getChildAt(0)
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.getMeasuredHeight();
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loadmoreDist = ((ViewGroup) loadmoreView).getChildAt(0)
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.getMeasuredHeight();
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}
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// 改变子控件的布局，这里直接用(pullDownY + pullUpY)作为偏移量，这样就可以不对当前状态作区分
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refreshView.layout(0,
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(int) (pullDownY + pullUpY) - refreshView.getMeasuredHeight(),
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refreshView.getMeasuredWidth(), (int) (pullDownY + pullUpY));
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pullableView.layout(0, (int) (pullDownY + pullUpY),
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pullableView.getMeasuredWidth(), (int) (pullDownY + pullUpY)
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+ pullableView.getMeasuredHeight());
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loadmoreView.layout(0,
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(int) (pullDownY + pullUpY) + pullableView.getMeasuredHeight(),
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loadmoreView.getMeasuredWidth(),
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(int) (pullDownY + pullUpY) + pullableView.getMeasuredHeight()
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+ loadmoreView.getMeasuredHeight());
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}
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class MyTimer {
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private Handler handler;
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private Timer timer;
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private MyTask mTask;
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public MyTimer(Handler handler) {
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this.handler = handler;
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timer = new Timer();
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}
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public void schedule(long period) {
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if (mTask != null) {
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mTask.cancel();
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mTask = null;
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}
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mTask = new MyTask(handler);
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timer.schedule(mTask, 0, period);
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}
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public void cancel() {
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if (mTask != null) {
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mTask.cancel();
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mTask = null;
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}
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}
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class MyTask extends TimerTask {
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private Handler handler;
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public MyTask(Handler handler) {
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this.handler = handler;
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}
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@Override
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public void run() {
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handler.obtainMessage().sendToTarget();
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}
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}
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}
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/**
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* 刷新加载回调接口
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*
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* @author chenjing
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*
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*/
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public interface OnRefreshListener {
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/**
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* 刷新操作
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*/
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void onRefresh(PullToRefreshLayout pullToRefreshLayout);
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/**
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* 加载操作
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*/
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void onLoadMore(PullToRefreshLayout pullToRefreshLayout);
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}
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}
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