android开源下拉刷新控件PullToRefreshLayout修正BUG

2015-06-18 18:22 加油~修阅读(426) 评论(0) 编辑收藏举报

PullToRefreshLayout.java

import android.content.Context;
import android.text.Html;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.AdapterView;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Scroller;
import android.widget.TextView;
 
 
public class PullToRefreshLayout extends FrameLayout implements
        GestureDetector.OnGestureListener {
    public static final int STATE_CLOSE = 1;
    public static final int STATE_OPEN = 2;
    public static final int STATE_OPEN_MAX = 4;
    public static final int STATE_OPEN_MAX_RELEASE = 5;
    public static final int STATE_OPEN_RELEASE = 3;
    public static final int STATE_UPDATE = 6;
    public static final int STATE_UPDATE_SCROLL = 7;
    private static int MAXHEIGHT = 80;
 
    private ImageView mArrow;
    private String mDate;
    private GestureDetector mDetector;
    private Flinger mFlinger;
    private boolean mIsAutoScroller;
    private int mPading;
    private ProgressBar mProgressBar;
    private int mState;
    private TextView mTitle;
    private FrameLayout mUpdateContent;
 
    private UpdateHandle mUpdateHandle;
 
    private RotateAnimation mFlipAnimation;
    private RotateAnimation mReverseFlipAnimation;
 
    private String tag = "<font color=\"#666666\"><b><big>";
    private String end_tag = "</font></b></big><br/>";
    private String relese;
    private String pulldown;
    private String loadding;
    private String last_time;
 
    private boolean mIsOpen = true;
 
    public PullToRefreshLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        relese = genString("释放立即刷新");
        pulldown = genString("下拉刷新");
        loadding = genString("正在刷新,请稍后...");
        last_time = "上次刷新时间:";
        addUpdateBar();
        init();
    }
 
    private String genString(String text) {
        StringBuffer buffer = new StringBuffer(tag);
        buffer.append(text);
        buffer.append(end_tag);
        return buffer.toString();
    }
 
    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        boolean isAuto = mIsAutoScroller;
        mDetector.onTouchEvent(ev);
        switch (ev.getAction()) {
        case MotionEvent.ACTION_MOVE:
            int y = getChildAt(1).getTop();
            if (y != 0) {
                updateView();
            }
            break;
        case MotionEvent.ACTION_UP:
            if (mState == STATE_OPEN) {
                mState = STATE_OPEN_RELEASE;
            }
            if (mState == STATE_OPEN_MAX) {
                mState = STATE_OPEN_MAX_RELEASE;
            }
            release();
            break;
        }
        if (mState != STATE_UPDATE) {
            isAuto = super.dispatchTouchEvent(ev);
        } else {
            return super.dispatchTouchEvent(ev);
        }
        int y = getChildAt(1).getTop();
        if (y != 0) {
            ev.setAction(MotionEvent.ACTION_CANCEL);
            super.dispatchTouchEvent(ev);
            updateView();
        }
        return isAuto;
    }
 
    private void init() {
        mDetector = new GestureDetector(this);
        mFlinger = new Flinger(getContext());
        mState = STATE_CLOSE;
        setDrawingCacheEnabled(true);
        setClipChildren(true);
        mDetector.setIsLongpressEnabled(false);
        MAXHEIGHT = (int) getContext().getResources().getDimension(
                R.dimen.size_updatebar_content_height);
    }
 
    private void updateView() {
        View view1 = getChildAt(0);
        View view2 = getChildAt(1);
        if (mDate == null)
            mDate = "";
        switch (mState) {
        case STATE_CLOSE:
            if (view1.getVisibility() != View.INVISIBLE)
                view1.setVisibility(View.INVISIBLE);
        case STATE_OPEN:
        case STATE_OPEN_RELEASE: {
            // STATE_OPEN
            int offset = -mPading - view2.getTop();
            view2.offsetTopAndBottom(offset);
            if (view1.getVisibility() != View.VISIBLE)
                view1.setVisibility(View.VISIBLE);
            int y1 = view1.getTop();// 相对于父窗口的顶部大小
            offset = -MAXHEIGHT - mPading - y1;
            view1.offsetTopAndBottom(offset);
            StringBuilder builder = new StringBuilder(pulldown);
            builder.append(last_time);
            builder.append(mDate);
            mTitle.setText(Html.fromHtml(builder.toString()));
            mProgressBar.setVisibility(View.INVISIBLE);
            mArrow.setVisibility(View.VISIBLE);
            if (!mIsOpen) {
                mIsOpen = true;
                mArrow.setAnimation(mReverseFlipAnimation);
                mReverseFlipAnimation.start();
            }
            break;
        }
        case STATE_OPEN_MAX_RELEASE:
        case STATE_OPEN_MAX: {
            int offset = -mPading - view2.getTop();
            view2.offsetTopAndBottom(offset);
            if (view1.getVisibility() != View.VISIBLE)
                view1.setVisibility(View.VISIBLE);
            offset = -MAXHEIGHT - mPading - view1.getTop();
            view1.offsetTopAndBottom(offset);
            StringBuilder builder = new StringBuilder(relese);
            builder.append(last_time);
            builder.append(mDate);
            mTitle.setText(Html.fromHtml(builder.toString()));
            mProgressBar.setVisibility(View.INVISIBLE);
            mArrow.setVisibility(View.VISIBLE);
            if (mIsOpen) {
                mIsOpen = false;
                mArrow.setAnimation(mFlipAnimation);
                mFlipAnimation.start();
            }
            break;
        }
        case STATE_UPDATE:
        // STATE_UPDATE
        {
            int offset = -mPading - view2.getTop();
            view2.offsetTopAndBottom(offset);
            if (mProgressBar.getVisibility() != View.VISIBLE)
                mProgressBar.setVisibility(View.VISIBLE);
            if (mArrow.getVisibility() != View.INVISIBLE)
                mArrow.setVisibility(View.INVISIBLE);
            StringBuffer builder = new StringBuffer(loadding);
            builder.append(last_time);
            builder.append(mDate);
            mTitle.setText(Html.fromHtml(builder.toString()));
            offset = -MAXHEIGHT - mPading - view1.getTop();
            view1.offsetTopAndBottom(offset);
            if (view1.getVisibility() != View.VISIBLE)
                view1.setVisibility(View.VISIBLE);
            mProgressBar.setVisibility(View.VISIBLE);
            mArrow.setVisibility(View.GONE);
            mArrow.clearAnimation();
            break;
        }
        }
        invalidate();
    }
 
    private void addUpdateBar() {
        Context context = getContext();
        mFlipAnimation = new RotateAnimation(0, -180,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        mFlipAnimation.setInterpolator(new LinearInterpolator());
        mFlipAnimation.setDuration(200);
        mFlipAnimation.setFillAfter(true);
        mReverseFlipAnimation = new RotateAnimation(-180, 0,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        mReverseFlipAnimation.setInterpolator(new LinearInterpolator());
        mReverseFlipAnimation.setDuration(200);
        mReverseFlipAnimation.setFillAfter(true);
        View view = LayoutInflater.from(context).inflate(
                R.layout.vw_update_bar, null);
        view.setVisibility(View.INVISIBLE);
        addView(view);
        mArrow = new ImageView(context);
        FrameLayout.LayoutParams mArrowParams = new FrameLayout.LayoutParams(
                FrameLayout.LayoutParams.FILL_PARENT,
                FrameLayout.LayoutParams.FILL_PARENT);
        ImageView.ScaleType localScaleType = ImageView.ScaleType.FIT_CENTER;
        mArrow.setScaleType(localScaleType);
        mArrow.setLayoutParams(mArrowParams);
        mArrow.setImageResource(R.drawable.arrow_down);
        mUpdateContent = (FrameLayout) getChildAt(0).findViewById(
                R.id.iv_content);
        mUpdateContent.addView(mArrow);
        FrameLayout.LayoutParams mProgressBarParams = new FrameLayout.LayoutParams(
                FrameLayout.LayoutParams.FILL_PARENT,
                FrameLayout.LayoutParams.FILL_PARENT);
        mProgressBarParams.gravity = Gravity.CENTER_VERTICAL;
        mProgressBar = new ProgressBar(context);
        int padding = getResources().getDimensionPixelSize(
                R.dimen.size_updatebar_padding);
        mProgressBar.setPadding(padding, padding, padding, padding);
        mProgressBar.setLayoutParams(mProgressBarParams);
        mUpdateContent.addView(mProgressBar);
        mTitle = (TextView) findViewById(R.id.tv_title);
    }
 
    @Override
    protected void onLayout(boolean changed, int left, int top, int right,
            int bottom) {
        // TODO Auto-generated method stub
        int mtop = -MAXHEIGHT - mPading;
        getChildAt(0).layout(0, mtop, getMeasuredWidth(), -mPading);
        int mbottom = getMeasuredHeight() - mPading;
        getChildAt(1).layout(0, -mPading, getMeasuredWidth(), mbottom);
    }
 
    public void endUpdate(String timeFomat) {
        mDate = timeFomat;
        if (mPading != 0) {
            mState = STATE_CLOSE;
            scrollToClose();
        }
    }
 
    @Override
    public void onShowPress(MotionEvent e) {
        // TODO Auto-generated method stub
 
    }
 
    @Override
    public void onLongPress(MotionEvent e) {
        // TODO Auto-generated method stub
 
    }
 
    @Override
    public boolean onDown(MotionEvent e) {
        return false;
    }
 
    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        return false;
    }
 
    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
            float distanceY) {
        AdapterView<?> adapterView = (AdapterView<?>) getChildAt(1);
        int k = adapterView.getCount();
        if (k == 0)
            return false;
        k = adapterView.getFirstVisiblePosition();// 获取第一个显示项目的position
        if (k == 0) {
            int t = adapterView.getChildAt(0).getTop();
            if (t != 0) {
                return false;
            } else {
                mPading = (int) (mPading + distanceY / 2);
                if (mPading > 0)
                    mPading = 0;
                if (Math.abs(mPading) <= MAXHEIGHT) {
                    mState = STATE_OPEN;
                } else {
                    mState = STATE_OPEN_MAX;
                }
                updateView();
            }
        }
        return false;
    }
 
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
            float velocityY) {
        return false;
    }
 
    private boolean release() {
        int tempStatus = STATE_OPEN_MAX_RELEASE;
        if (mPading >= 0) {
            return true;
        }
        switch (mState) {
        case STATE_OPEN_RELEASE:
            if (Math.abs(mPading) < MAXHEIGHT) {
                tempStatus = STATE_OPEN_MAX_RELEASE;
                mState = tempStatus;
            }
            scrollToClose();
            break;
        case STATE_OPEN_MAX_RELEASE:
            mState = tempStatus;
            scrollToUpdate();
            break;
        }
        return false;
    }
 
    private void scrollToClose() {
        mFlinger.startUsingDistance(-mPading, 2000);
    }
 
    private void scrollToUpdate() {
        mFlinger.startUsingDistance(-mPading - MAXHEIGHT, 1000);
    }
 
    class Flinger implements Runnable {
        private int mLastFlingX;
        private Scroller mScroller;
 
        public Flinger(Context context) {
            mScroller = new Scroller(context);
        }
 
        private void startCommon() {
            removeCallbacks(this);
        }
 
        public void run() {
            boolean auto = Math.abs(mPading) != MAXHEIGHT;
            boolean compute = mScroller.computeScrollOffset();
            move(mLastFlingX - mScroller.getCurrX(), auto);
            updateView();
            if (compute) {
                mLastFlingX = mScroller.getCurrX();
                post(this);
            } else {
                mIsAutoScroller = auto;
                removeCallbacks(this);
            }
        }
 
        public void startUsingDistance(int padding, int duration) {
            int i = 0;
            if (padding == 0)
                padding = -1;
            startCommon();
            mLastFlingX = i;
            mScroller.startScroll(i, 0, -padding, 0, duration);
            mIsAutoScroller = true;
            post(this);
        }
    }
 
    /**
     * 释放的时候使用
     */
    public void move(float f, boolean bool) {
        if (mState != STATE_CLOSE) {
            if (!bool) {
                // 刷新
                if (mState == STATE_OPEN_MAX_RELEASE) {
                    mState = STATE_UPDATE;
                    if (mUpdateHandle != null) {
                        mUpdateHandle.onUpdate();
                    }
                }
            }
            if (mState == STATE_OPEN_MAX_RELEASE
                    || mState == STATE_OPEN_RELEASE) {
                mPading += f;
            }
        } else {
            if (mIsAutoScroller) {
                mPading += f;
            }
        }
    }
 
    public abstract interface UpdateHandle {
        public abstract void onUpdate();
    }
 
    public void setUpdateDate(String timeFomat) {
        mDate = timeFomat;
    }
 
    public void setUpdateHandle(UpdateHandle paramUpdateHandle) {
        mUpdateHandle = paramUpdateHandle;
    }
 
    public void updateWithoutOffset() {
        mState = STATE_UPDATE_SCROLL;
        invalidate();
    }
}

vw_update_bar.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="@dimen/size_updatebar_padding"
    android:background="#FFF4F4F4"
    android:orientation="vertical" >
 
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/size_updatebar_content_height"
        android:background="#FFF4F4F4" >
 
        <TextView
            android:id="@+id/tv_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:background="#FFF4F4F4"
            android:gravity="center"
            android:textSize="12sp" >
        </TextView>
 
        <FrameLayout
            android:id="@+id/iv_content"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="15.0dip" >
        </FrameLayout>
    </FrameLayout>
 
    <ImageView
        android:layout_width="fill_parent"
        android:layout_height="1.0dip"
        android:contentDescription="@string/app_name"
        android:scaleType="fitXY"
        android:src="@drawable/divider_horizontal_timeline" >
    </ImageView>
 
</LinearLayout>

demens文件

<dimen name="size_updatebar_content_height">48dp</dimen>
<dimen name="size_updatebar_padding">12dp</dimen>

使用方法:

refreshLayout = (PullToRefreshLayout) findViewById(R.id.pull_refresh);
refreshLayout.setUpdateHandle(new UpdateHandle() {
 
    @Override
    public void onUpdate() {
        // TODO Auto-generated method stub
        new TaskThread() {
 
            @Override
            public void process() throws Exception {
                // TODO Auto-generated method stub
                sleep(3000);
                refreshLayout.endUpdate(Tools.newDateTime());
            }
        }.start();
    }
});

布局代码:

<com.PullToRefreshLayout
    android:id="@+id/pull_refresh"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
 
    <ExpandableListView
        android:id="@+id/expand_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:cacheColorHint="@null"
        android:groupIndicator="@null"
        android:listSelector="@drawable/default_selector"
        android:scrollbars="none" >
    </ExpandableListView>
</com.PullToRefreshLayout>

效果图:

刷新页面返回顶部

加油~修

android开源下拉刷新控件PullToRefreshLayout修正BUG

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