android开源下拉刷新控件PullToRefreshLayout修正BUG

Home / Android MrLee 2014-11-27 4504
网上开源的有些有BUG，这里已经修正了一些小问题。贴出代码和大家共享。
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:

QQ截图20150402155239

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最新回复 (1)
  • itdinoho 2017-1-16
    引用 2楼
    今天再用到这个控件的时候,出现类型转换异常,找了下原因.之前我用的是ExpandListView,而这次用的是相对布局,所以出错了.这里只需要把代码简单改下. 
    @Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
        float distanceY) {
    ViewGroup layout = (ViewGroup) getChildAt(1);
    int k = layout.getChildCount();
    if (k == 0)
        return false;
    k = layout.getChildAt(0).getTop();// 获取第一个显示项目的position
    if (k == 0) {
        int t = layout.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;
}
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