Android ListView 下拉刷新上拉更多

Android平台开发

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开发语言：Java
实例大小：0.20M
下载次数：32
浏览次数：492
发布时间：2013-08-07
实例类别：Android平台开发
发布人：apex118
文件格式：.zip
所需积分：2

实例介绍

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【实例简介】Android ListView 下拉刷新上拉更多
【实例截图】

【核心代码】

public class ScrollOverListView extends ListView implements OnScrollListener {
 
    private int mLastY;
     
    private int mBottomPosition;
 
    private static final String TAG = "listview";
 
    /**松开更新**/
    private final static int RELEASE_To_REFRESH = 0;
    /**下拉更新**/
    private final static int PULL_To_REFRESH = 1;
    /**更新中**/
    private final static int REFRESHING = 2;
    /**无**/
    private final static int DONE = 3;
    /**加载中**/
    private final static int LOADING = 4;
    /**实际的padding的距离与界面上偏移距离的比例**/
    private final static int RATIO = 3;
     
    private LayoutInflater inflater;
    /**头部刷新的布局**/
    private LinearLayout headView;
    /**头部显示下拉刷新等的控件**/
    private TextView tipsTextview;
    /**刷新控件**/
    private TextView lastUpdatedTextView;
    /**箭头图标**/
    private ImageView arrowImageView;
    /**头部滚动条**/
    private ProgressBar progressBar;
    /**显示动画**/
    private RotateAnimation animation;
    /**头部回退显示动画**/
    private RotateAnimation reverseAnimation;
    /** 用于保证startY的值在一个完整的touch事件中只被记录一次**/
    private boolean isRecored;
    /**头部高度**/
    private int headContentHeight;
    /**开始的Y坐标**/
    private int startY;
    /**第一个item**/
    private int firstItemIndex;
    /**状态**/
    private int state;
     
    private boolean isBack;
    /**是否要使用下拉刷新功能**/
    public boolean showRefresh = true;
 
    public static boolean canRefleash = true;
 
    public ScrollOverListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context);
    }
 
    public ScrollOverListView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }
 
    public ScrollOverListView(Context context) {
        super(context);
        init(context);
    }
 
    /**出事化控件**/
    private void init(Context context) {
        mBottomPosition = 0;
        setCacheColorHint(0);
        inflater = LayoutInflater.from(context);
 
        headView = (LinearLayout) inflater.inflate(R.layout.pull_down_head,
                null);
        arrowImageView = (ImageView) headView
                .findViewById(R.id.head_arrowImageView);
        arrowImageView.setMinimumWidth(70);
        arrowImageView.setMinimumHeight(50);
        progressBar = (ProgressBar) headView
                .findViewById(R.id.head_progressBar);
        tipsTextview = (TextView) headView.findViewById(R.id.head_tipsTextView);
        lastUpdatedTextView = (TextView) headView
                .findViewById(R.id.head_lastUpdatedTextView);
 
        measureView(headView);
 
        headContentHeight = headView.getMeasuredHeight();
 
        headView.setPadding(0, -1 * headContentHeight, 0, 0);
        headView.invalidate();
 
        /**列表添加头部**/
        addHeaderView(headView, null, false);
 
        setOnScrollListener(this);
 
        animation = new RotateAnimation(0, -180,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        animation.setInterpolator(new LinearInterpolator());
        animation.setDuration(250);
        animation.setFillAfter(true);
         
 
        reverseAnimation = new RotateAnimation(-180, 0,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f);
         
        reverseAnimation.setInterpolator(new LinearInterpolator());
        reverseAnimation.setDuration(200);
        reverseAnimation.setFillAfter(true);
         
        state = DONE;
    }
 
    /**触摸事件的处理**/
    @Override
    public boolean onTouchEvent(MotionEvent ev) {
 
        final int action = ev.getAction();
        final int y = (int) ev.getRawY();
        cancelLongPress();
        switch (action) {
        case MotionEvent.ACTION_DOWN: {  //按下的时候
            if (firstItemIndex == 0 && !isRecored) {
                isRecored = true;
                startY = (int) ev.getY();
                Log.v(TAG, "在down时候记录当前位置‘");
            }
            // ===========================
            mLastY = y;
            final boolean isHandled = mOnScrollOverListener.onMotionDown(ev);
            if (isHandled) {
                mLastY = y;
                return isHandled;
            }
            break;
        }
 
        case MotionEvent.ACTION_MOVE: {   //手指正在移动的时候
            int tempY = (int) ev.getY();
            if (showRefresh) {
                 
                if (!isRecored && firstItemIndex == 0) {
                    Log.v(TAG, "在move时候记录下位置");
                    isRecored = true;
                    startY = tempY;
                }
                if (state != REFRESHING && isRecored && state != LOADING) {
 
                    // 保证在设置padding的过程中，当前的位置一直是在head，否则如果当列表超出屏幕的话，当在上推的时候，列表会同时进行滚动
 
                    // 可以松手去刷新了
                    if (state == RELEASE_To_REFRESH) {
 
                        setSelection(0);
 
                        // 往上推了，推到了屏幕足够掩盖head的程度，但是还没有推到全部掩盖的地步
                        if (((tempY - startY) / RATIO < headContentHeight)
                                && (tempY - startY) > 0) {
                            state = PULL_To_REFRESH;
                            changeHeaderViewByState();
 
                        }
                        // 一下子推到顶了
                        else if (tempY - startY <= 0) {
                            state = DONE;
                            changeHeaderViewByState();
 
                            Log.v(TAG, "由松开刷新状态转变到done状态");
                        }
                        // 往下拉了，或者还没有上推到屏幕顶部掩盖head的地步
                        else {
                            // 不用进行特别的操作，只用更新paddingTop的值就行了
                        }
                    }
                    // 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态
                    if (state == PULL_To_REFRESH) {
 
                        setSelection(0);
 
                        // 下拉到可以进入RELEASE_TO_REFRESH的状态
                        if ((tempY - startY) / RATIO >= headContentHeight) {
                            state = RELEASE_To_REFRESH;
                            isBack = true;
                            changeHeaderViewByState();
 
                            Log.v(TAG, "由done或者下拉刷新状态转变到松开刷新");
                        }
                        // 上推到顶了
                        else if (tempY - startY <= 0) {
                            state = DONE;
                            changeHeaderViewByState();
 
                            Log.v(TAG, "由DOne或者下拉刷新状态转变到done状态");
                        }
                    }
 
                    // done状态下
                    if (state == DONE) {
                        if (tempY - startY > 0) {
                            state = PULL_To_REFRESH;
                            changeHeaderViewByState();
                        }
                    }
 
                    // 更新headView的size
                    if (state == PULL_To_REFRESH) {
                        headView.setPadding(0, -1 * headContentHeight
                                  (tempY - startY) / RATIO, 0, 0);
                    }
 
                    // 更新headView的paddingTop
                    if (state == RELEASE_To_REFRESH) {
                        headView.setPadding(0, (tempY - startY) / RATIO
                                - headContentHeight, 0, 0);
                    }
 
                }
            }
            // ==============================================
            final int childCount = getChildCount();
            if (childCount == 0)
                return super.onTouchEvent(ev);
            final int itemCount = getAdapter().getCount() - mBottomPosition;
            final int deltaY = y - mLastY;
            final int lastBottom = getChildAt(childCount - 1).getBottom();
            final int end = getHeight() - getPaddingBottom();
 
            final int firstVisiblePosition = getFirstVisiblePosition();
 
            final boolean isHandleMotionMove = mOnScrollOverListener
                    .onMotionMove(ev, deltaY);
 
            if (isHandleMotionMove) {
                mLastY = y;
                return true;
            }
 
            /** 到达底部 *  到达底部的事件在另外一个类执行**/
            if (firstVisiblePosition   childCount >= itemCount
                    && lastBottom <= end && deltaY < 0) {
                final boolean isHandleOnListViewBottomAndPullDown;
                isHandleOnListViewBottomAndPullDown = mOnScrollOverListener
                        .onListViewBottomAndPullUp(deltaY);
                if (isHandleOnListViewBottomAndPullDown) {
                    mLastY = y;
                    return true;
                }
            }
            break;
        }
 
        case MotionEvent.ACTION_UP: {   //手指抬起来的时候
            if (state != REFRESHING && state != LOADING) {
                if (state == DONE) {
                    // 什么都不做
                }
                if (state == PULL_To_REFRESH) {
                    state = DONE;
                    changeHeaderViewByState();
                    Log.v(TAG, "由下拉刷新状态，到done状态");
                }
 
                if (state == RELEASE_To_REFRESH) {
                    state = REFRESHING;
                    changeHeaderViewByState();
 
                    canRefleash = true;
 
                    Log.v(TAG, "由松开刷新状态，到done状态");
                }
            }
 
            isRecored = false;
            isBack = false;
 
            // /======================
            final boolean isHandlerMotionUp = mOnScrollOverListener
                    .onMotionUp(ev);
            if (isHandlerMotionUp) {
                mLastY = y;
                return true;
            }
            break;
        }
        }
        mLastY = y;
        return super.onTouchEvent(ev);
    }
     
     
     
     
     
     
     
     
 
    /** 空的 */
    private OnScrollOverListener mOnScrollOverListener = new OnScrollOverListener() {
 
        @Override
        public boolean onListViewTopAndPullDown(int delta) {
            return false;
        }
 
        @Override
        public boolean onListViewBottomAndPullUp(int delta) {
            return false;
        }
 
        @Override
        public boolean onMotionDown(MotionEvent ev) {
            return false;
        }
 
        @Override
        public boolean onMotionMove(MotionEvent ev, int delta) {
            return false;
        }
 
        @Override
        public boolean onMotionUp(MotionEvent ev) {
            return false;
        }
 
    };
 
    // =============================== public method
    /**
     * 可以自定义其中一个条目为头部，头部触发的事件将以这个为准，默认为第一个
     * 
     * @param index  正数第几个，必须在条目数范围之内
     */
    public void setTopPosition(int index) {
        if (getAdapter() == null)
            throw new NullPointerException(
                    "You must set adapter before setTopPosition!");
        if (index < 0)
            throw new IllegalArgumentException("Top position must > 0");
    }
 
    /**
     * 可以自定义其中一个条目为尾部，尾部触发的事件将以这个为准，默认为最后一个
     * 
     * @param index  倒数第几个，必须在条目数范围之内
     */
    public void setBottomPosition(int index) {
        if (getAdapter() == null)
            throw new NullPointerException(
                    "You must set adapter before setBottonPosition!");
        if (index < 0)
            throw new IllegalArgumentException("Bottom position must > 0");
 
        mBottomPosition = index;
    }
 
    /**
     * 设置这个Listener可以监听是否到达顶端，或者是否到达低端等事件</br>
     * 
     * @see OnScrollOverListener
     */
    public void setOnScrollOverListener(
            OnScrollOverListener onScrollOverListener) {
        mOnScrollOverListener = onScrollOverListener;
    }
 
    /**
     * 滚动监听接口
     * 
     * @see ScrollOverListView#setOnScrollOverListener(OnScrollOverListener)
     * 
     */
    public interface OnScrollOverListener {
        /**
         * 到达最顶部触发
         * 
         * @param delta
         *            手指点击移动产生的偏移量
         * @return
         */
        boolean onListViewTopAndPullDown(int delta);
 
        /**
         * 到达最底部触发
         * 
         * @param delta
         *            手指点击移动产生的偏移量
         * @return
         */
        boolean onListViewBottomAndPullUp(int delta);
 
        /**
         * 手指触摸按下触发，相当于{@link MotionEvent#ACTION_DOWN}
         * 
         * @return 返回true表示自己处理
         * @see View#onTouchEvent(MotionEvent)
         */
        boolean onMotionDown(MotionEvent ev);
 
        /**
         * 手指触摸移动触发，相当于{@link MotionEvent#ACTION_MOVE}
         * 
         * @return 返回true表示自己处理
         * @see View#onTouchEvent(MotionEvent)
         */
        boolean onMotionMove(MotionEvent ev, int delta);
 
        /**
         * 手指触摸后提起触发，相当于{@link MotionEvent#ACTION_UP}
         * 
         * @return 返回true表示自己处理
         * @see View#onTouchEvent(MotionEvent)
         */
        boolean onMotionUp(MotionEvent ev);
 
    }
 
     
    @Override
    public void onScroll(AbsListView arg0, int firstVisiableItem, int arg2,
            int arg3) {
        firstItemIndex = firstVisiableItem;
         
    }
 
    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
 
    }
 
    // 此方法直接照搬自网络上的一个下拉刷新的demo，此处是“估计”headView的width以及height
    private void measureView(View child) {
        ViewGroup.LayoutParams p = child.getLayoutParams();
        if (p == null) {
            p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT);
        }
        int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0   0, p.width);
        int lpHeight = p.height;
        int childHeightSpec;
        if (lpHeight > 0) {
            childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight,
                    MeasureSpec.EXACTLY);
        } else {
            childHeightSpec = MeasureSpec.makeMeasureSpec(0,
                    MeasureSpec.UNSPECIFIED);
        }
        child.measure(childWidthSpec, childHeightSpec);
    }
     
     
     
     
     
     
     
 
    public void onRefreshComplete() {
        state = DONE;
        lastUpdatedTextView.setText("最近更新:"   new Date().toLocaleString());
        changeHeaderViewByState();
    }
 
    // 当状态改变时候，调用该方法，以更新界面
    private void changeHeaderViewByState() {
        switch (state) {
        case RELEASE_To_REFRESH:
            arrowImageView.setVisibility(View.VISIBLE);
            progressBar.setVisibility(View.GONE);
            tipsTextview.setVisibility(View.VISIBLE);
            lastUpdatedTextView.setVisibility(View.VISIBLE);
 
            arrowImageView.clearAnimation();
            arrowImageView.startAnimation(animation);
 
            tipsTextview.setText("松开刷新");
 
            Log.v(TAG, "当前状态，松开刷新");
            break;
        case PULL_To_REFRESH:
            progressBar.setVisibility(View.GONE);
            tipsTextview.setVisibility(View.VISIBLE);
            lastUpdatedTextView.setVisibility(View.VISIBLE);
            arrowImageView.clearAnimation();
            arrowImageView.setVisibility(View.VISIBLE);
            // 是由RELEASE_To_REFRESH状态转变来的
            if (isBack) {
                isBack = false;
                arrowImageView.clearAnimation();
                arrowImageView.startAnimation(reverseAnimation);
 
                tipsTextview.setText("下拉刷新");
            } else {
                tipsTextview.setText("下拉刷新");
            }
            Log.v(TAG, "当前状态，下拉刷新");
            break;
 
        case REFRESHING:
 
            headView.setPadding(0, 0, 0, 0);
            progressBar.setVisibility(View.VISIBLE);
            arrowImageView.clearAnimation();
            arrowImageView.setVisibility(View.GONE);
            tipsTextview.setText("正在刷新...");
            lastUpdatedTextView.setVisibility(View.VISIBLE);
 
            Log.v(TAG, "当前状态,正在刷新...");
            break;
        case DONE:
            headView.setPadding(0, -1 * headContentHeight, 0, 0);
            progressBar.setVisibility(View.GONE);
            arrowImageView.clearAnimation();
            arrowImageView.setImageResource(R.drawable.pull_down_arrow);
            tipsTextview.setText("下拉刷新");
            lastUpdatedTextView.setVisibility(View.VISIBLE);
 
            Log.v(TAG, "当前状态，done");
            break;
        }
    }
}

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