Android RefreshLayout實(shí)現(xiàn)下拉刷新布局

更新時(shí)間：2016年10月28日 08:40:29 作者：littlewhitetree

這篇文章主要為大家詳細(xì)介紹了Android RefreshLayout實(shí)現(xiàn)下拉刷新布局,具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

項(xiàng)目中需要下拉刷新的功能，但是這個(gè)View不是ListView這類(lèi)的控件，需要ViewGroup實(shí)現(xiàn)這個(gè)功能，一開(kāi)始網(wǎng)上大略找了一下，沒(méi)發(fā)現(xiàn)特別合適的，代碼也是沒(méi)怎么看懂，所以決定還是自己寫(xiě)一個(gè)。

于是翻出XlistView的源碼看是一點(diǎn)一點(diǎn)看，再大致理解了XLisview源碼，終于決定自己動(dòng)手啦

為了省事，headView還是用了XListView的HeadView，省了很多事：）

下拉刷新，下拉刷新，肯定是先實(shí)現(xiàn)下拉功能，最開(kāi)始我是打算通過(guò) extends ScrollView 來(lái)實(shí)現(xiàn)，因?yàn)橛鞋F(xiàn)成的滾動(dòng)效果嘛，可是實(shí)際因?yàn)閮蓚€(gè)原因放棄了：

1、ScrollView下只能有一個(gè)子控件View ,雖然在 Scroll下添加一個(gè)ViewGroup，然后講headView動(dòng)態(tài)添加進(jìn)前面的ViewGroup，但是我還是比較習(xí)慣studio的可視化預(yù)覽，總覺(jué)得不直觀！

2、 ScrollView內(nèi)嵌ListView時(shí)會(huì)發(fā)生沖突，還需要去重寫(xiě)ListView。于是放棄換個(gè)思路！

關(guān)于上面的原因1：動(dòng)態(tài)添加headView進(jìn)ScrollView的中GroupView中，可以在重寫(xiě)ScrollView的onViewAdded（）方法，將初始化時(shí)解析的headView添加進(jìn)子GroupView

@Override 
public void onViewAdded(View child) { 
  super.onViewAdded(child); 
  //因?yàn)閔eadView要在最上面，最先想到的就是Vertical的LinearLayout 
  LinearLayout linearLayout = (LinearLayout) getChildAt(0); 
  linearLayout.addView(view, 0); 
}

換個(gè)思路，通過(guò)extends LinearLayout來(lái)實(shí)現(xiàn)吧！
先做準(zhǔn)備工作，我們需要一個(gè)HeaderView以及要獲取到HeaderView的高度，還有初始時(shí)Layout的高度

private void initView(Context context) { 
   mHeaderView = new SRefreshHeader(context); 
   mHeaderViewContent = (RelativeLayout) mHeaderView.findViewById(R.id.slistview_header_content); 
   setOrientation(VERTICAL); 
   addView(mHeaderView, 0); 
   getHeaderViewHeight(); 
   getViewHeight(); 
 }

mHeaderView = new SRefreshHeader(context);
通過(guò)構(gòu)造方法實(shí)例化HeaderView

mHeaderViewContent = (RelativeLayout)

mHeaderView.findViewById(R.id.slistview_header_content);

這是解析headerView內(nèi)容區(qū)域iew,等會(huì)兒要獲取這個(gè)view的高度，你肯定會(huì)問(wèn)為啥不用上面的mHeaderView來(lái)獲取高度，點(diǎn)進(jìn)構(gòu)造方法里可以看到如下代碼

// 初始情況，設(shè)置下拉刷新view高度為0 
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, 0); 
mContainer = (LinearLayout) LayoutInflater.from(context).inflate(R.layout.listview_head_view_layout, null); 
w(mContainer, lp);

如果直接獲取mHeaderView的高度那肯定是0
getHeaderViewHeight();
getViewHeight();
分別是獲取HeaderView的高度和Layout的初始高度

/** 
  * 獲取headView高度 
  */ 
  private void getHeaderViewHeight() { 
    ViewTreeObserver vto2 = mHeaderViewContent.getViewTreeObserver(); 
    vto2.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { 
      @Override 
      public void onGlobalLayout() { 
        mHeaderViewHeight = mHeaderViewContent.getHeight(); 
        mHeaderViewContent.getViewTreeObserver().removeGlobalOnLayoutListener(this); 
      } 
    }); 
  } 
 
  /** 
  * 獲取SRefreshLayout當(dāng)前實(shí)例的高度 
  */ 
  private void getViewHeight() { 
    ViewTreeObserver thisView = getViewTreeObserver(); 
    thisView.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { 
      @Override 
      public void onGlobalLayout() { 
        SRefreshLayout.this.mHeight = SRefreshLayout.this.getHeight(); 
        SRefreshLayout.this.getViewTreeObserver().removeGlobalOnLayoutListener(this); 
      } 
    }); 
  }

準(zhǔn)備工作完成了，接下來(lái)就是要成下拉操作了
到這里，肯定一下就想到了onTouchEvent（）方法，是的！現(xiàn)在就開(kāi)始在這里施工

實(shí)現(xiàn)下拉一共會(huì)經(jīng)歷三個(gè)過(guò)程
ACTION_UP→ACTION_MOVE→ACTION_UP
在ACTION_UP事件中，也就是手指按下的時(shí)候，我們需要做的只是記錄按下時(shí)候的坐標(biāo)

switch (ev.getAction()) { 
      case MotionEvent.ACTION_DOWN: 
        //記錄起始高度 
        mLastY = ev.getRawY();//記錄按下時(shí)的Y坐標(biāo) 
        break;

然后就是ACTION_MOVE事件了，這里是最重要的，因?yàn)橄吕瓡r(shí)HeadView和Layout的高度變化都在這里進(jìn)行

case MotionEvent.ACTION_MOVE: 
       if (!isRefreashing) 
         isRefreashing = true; 
       final float deltaY = ev.getRawY() - mLastY; 
       mLastY = ev.getRawY(); 
       updateHeaderViewHeight(deltaY / 1.8f);//按一定比例縮小移動(dòng)距離 
       updateHeight(); 
       break;

里面的updateHeaderViewHeight和updateHeight分別是改變HeaderView的高度和Layout的高度

 private void updateHeight() { 
    ViewGroup.LayoutParams lp = getLayoutParams(); 
    //更新當(dāng)前l(fā)ayout實(shí)例高度為headerView高度加上最初的layout高度 
    //如果不更新layout 會(huì)造成內(nèi)容高度壓縮 無(wú)法保持比例 
    lp.height = (mHeight + mHeaderView.getVisiableHeight()); 
    setLayoutParams(lp); 
  } 
 
  private void updateHeaderViewHeight(float space) { 
//    if (space < 0) 
//      space = 0; 
//    int factHeight = (int) (space - mHeaderViewHeight); 
    if (mHeaderView.getStatus() != SRefreshHeader.STATE_REFRESHING) { 
      //如果不處于刷新中同時(shí)如果高度 
      if (mHeaderView.getVisiableHeight() < mHeaderViewHeight * 2 && mHeaderView.getStatus() != SRefreshHeader.STATE_NORMAL) { 
        mHeaderView.setState(SRefreshHeader.STATE_NORMAL); 
      } 
      if (mHeaderView.getVisiableHeight() > mHeaderViewHeight * 2 && mHeaderView.getStatus() != SRefreshHeader.STATE_READY) { 
        mHeaderView.setState(SRefreshHeader.STATE_READY); 
      } 
    } 
    mHeaderView.setVisiableHeight((int) space 
        + mHeaderView.getVisiableHeight()); 
  }

更新Header高度時(shí)，通過(guò)下拉的距離來(lái)判斷是否到達(dá)刷新的距離，上面代碼中我設(shè)定的是到達(dá)mHeaderView初始高度的兩倍，就進(jìn)入“釋放刷新”的狀態(tài)，如果沒(méi)有達(dá)到則保持“下拉刷新”的狀態(tài)
HeaderView中的狀態(tài)一共設(shè)定了3個(gè)分別是

public final static int STATE_NORMAL = 0;//下拉刷新 
 public final static int STATE_READY = 1;//釋放刷新 
 public final static int STATE_REFRESHING = 2;//刷新中

更新高度的方法headerView和layout都是相同的，就是原高度加上移動(dòng)的距離重新賦給headerView或者layout

mHeaderView.setVisiableHeight((int) space
+ mHeaderView.getVisiableHeight());

最后就是ACTION_UP事件了就是手指離開(kāi)屏幕的時(shí)候，在這里我們需要根據(jù)headerView目前狀態(tài)來(lái)決定headerView的最終狀態(tài)！

case MotionEvent.ACTION_UP: 
        //松開(kāi)時(shí) 
        //避免點(diǎn)擊事件觸發(fā) 
        if (!isRefreashing) 
          break; 
        //如果headView狀態(tài)處于READY狀態(tài) 則說(shuō)明松開(kāi)時(shí)應(yīng)該進(jìn)入REFRESHING狀態(tài) 
        if (mHeaderView.getStatus() == SRefreshHeader.STATE_READY) { 
          mHeaderView.setState(SRefreshHeader.STATE_REFRESHING); 
        } 
        //根據(jù)狀態(tài)重置SrefreshLayout當(dāng)前實(shí)例和headView高度 
        resetHeadView(mHeaderView.getStatus()); 
        reset(mHeaderView.getStatus()); 
        mLastY = -1;//重置坐標(biāo) 
        break;

resetHeadView和reset分別是重置headerView高度和layout高度的方法

private void reset(int status) { 
    ViewGroup.LayoutParams lp = getLayoutParams(); 
    switch (status) { 
      case SRefreshHeader.STATE_REFRESHING: 
        lp.height = mHeight + mHeaderViewHeight; 
        break; 
      case SRefreshHeader.STATE_NORMAL: 
        lp.height = mHeight; 
        break; 
    } 
    setLayoutParams(lp); 
  } 
 
  private void resetHeadView(int status) { 
    switch (status) { 
      case SRefreshHeader.STATE_REFRESHING: 
        mHeaderView.setVisiableHeight(mHeaderViewHeight); 
        break; 
      case SRefreshHeader.STATE_NORMAL: 
        mHeaderView.setVisiableHeight(0); 
        break; 
    } 
  }

實(shí)現(xiàn)方式也是一樣的。根據(jù)狀態(tài)來(lái)判斷，如果是處于刷新中，那headerView應(yīng)該正常顯示，并且高度是初始的高度，如果處于NORMAL，也就是"下拉刷新"狀態(tài)，那么說(shuō)未觸發(fā)刷新，重置時(shí)，headerView應(yīng)該被隱藏，也就是高度重置為0

到這里下拉刷新操作也基本完成了，還需要加一個(gè)回調(diào)接口進(jìn)行通知

interface OnRefreshListener { 
    void onRefresh(); 
  }

case MotionEvent.ACTION_UP: 
        //松開(kāi)時(shí) 
        //避免點(diǎn)擊事件觸發(fā) 
        if (!isRefreashing) 
          break; 
        //如果headView狀態(tài)處于READY狀態(tài) 則說(shuō)明松開(kāi)時(shí)應(yīng)該進(jìn)入REFRESHING狀態(tài) 
        if (mHeaderView.getStatus() == SRefreshHeader.STATE_READY) { 
          mHeaderView.setState(SRefreshHeader.STATE_REFRESHING); 
          if (mOnRefreshListener != null) 
            mOnRefreshListener.onRefresh(); 
        } 
        //根據(jù)狀態(tài)重置SrefreshLayout當(dāng)前實(shí)例和headView高度 
        resetHeadView(mHeaderView.getStatus()); 
        reset(mHeaderView.getStatus()); 
        mLastY = -1;//重置坐標(biāo) 
        break;

好，到這里就基本完成了，試試效果吧。咦，發(fā)現(xiàn)一個(gè)問(wèn)題，嵌套ListView的時(shí)候?yàn)槭裁催@個(gè)Layout不能執(zhí)行下拉刷新！仔細(xì)想想應(yīng)該是事件分發(fā)的問(wèn)題，還需要處理一下事件的攔截！
關(guān)于事件攔截的處理，閱讀了鴻洋大神寫(xiě)的viewgroup事件分發(fā)的博客和Android-Ultra-Pull-To-Refresh的部分源碼，從中找到了解決辦法：

@Override 
  public boolean onInterceptTouchEvent(MotionEvent ev) { 
    AbsListView absListView = null; 
    for (int n = 0; n < getChildCount(); n++) { 
      if (getChildAt(n) instanceof AbsListView) { 
        absListView = (ListView) getChildAt(n); 
        Logs.v("查找到listView"); 
      } 
    } 
    if (absListView == null) 
      return super.onInterceptTouchEvent(ev); 
    switch (ev.getAction()) { 
      case MotionEvent.ACTION_DOWN: 
        mStartY = ev.getRawY(); 
        break; 
      case MotionEvent.ACTION_MOVE: 
        float space = ev.getRawY() - mStartY; 
        Logs.v("space:" + space); 
        if (space > 0 && !absListView.canScrollVertically(-1) && absListView.getFirstVisiblePosition() == 0) { 
          Logs.v("攔截成功"); 
          return true; 
        } else { 
          Logs.v("不攔截"); 
          return false; 
        } 
    } 
    return super.onInterceptTouchEvent(ev); 
  }

其中

if (space > 0 && !absListView.canScrollVertically(-1) && absListView.getFirstVisiblePosition() == 0)
space即移動(dòng)的距離 canScrollVertically（）是判斷ListView能否在垂直方向上滾動(dòng)，參數(shù)為負(fù)數(shù)時(shí)代表向上，為正數(shù)時(shí)代碼向下滾動(dòng)，最后一個(gè)就是ListView第一個(gè)可見(jiàn)的item的postion

加上上面的事件攔截處理，一個(gè)可以滿(mǎn)足開(kāi)頭提到的需求的Viewgroup也就完成了！

下面貼上Layout的源碼和HeaderView(直接使用的XlistView的HeaderView)的源碼

public class SRefreshLayout extends LinearLayout { 
  private SRefreshHeader mHeaderView; 
  private RelativeLayout mHeaderViewContent; 
  private boolean isRefreashing; 
  private float mLastY = -1;//按下的起始高度 
  private int mHeaderViewHeight;//headerView內(nèi)容高度 
  private int mHeight;//布局高度 
  private float mStartY; 
 
  interface OnRefreshListener { 
    void onRefresh(); 
  } 
 
  public OnRefreshListener mOnRefreshListener; 
 
  public SRefreshLayout(Context context) { 
    super(context); 
    initView(context); 
  } 
 
  public SRefreshLayout(Context context, AttributeSet attrs) { 
    super(context, attrs); 
    initView(context); 
  } 
 
  public SRefreshLayout(Context context, AttributeSet attrs, int defStyleAttr) { 
    super(context, attrs, defStyleAttr); 
    initView(context); 
  } 
 
  private void initView(Context context) { 
    mHeaderView = new SRefreshHeader(context); 
    mHeaderViewContent = (RelativeLayout) mHeaderView.findViewById(R.id.slistview_header_content); 
    setOrientation(VERTICAL); 
    addView(mHeaderView, 0); 
    getHeaderViewHeight(); 
    getViewHeight(); 
  } 
 
  /** 
   * 獲取headView高度 
   */ 
  private void getHeaderViewHeight() { 
    ViewTreeObserver vto2 = mHeaderViewContent.getViewTreeObserver(); 
    vto2.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { 
      @Override 
      public void onGlobalLayout() { 
        mHeaderViewHeight = mHeaderViewContent.getHeight(); 
        mHeaderViewContent.getViewTreeObserver().removeGlobalOnLayoutListener(this); 
      } 
    }); 
  } 
 
  /** 
   * 獲取SRefreshLayout當(dāng)前實(shí)例的高度 
   */ 
  private void getViewHeight() { 
    ViewTreeObserver thisView = getViewTreeObserver(); 
    thisView.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { 
      @Override 
      public void onGlobalLayout() { 
        SRefreshLayout.this.mHeight = SRefreshLayout.this.getHeight(); 
        SRefreshLayout.this.getViewTreeObserver().removeGlobalOnLayoutListener(this); 
      } 
    }); 
  } 
 
  @Override 
  public boolean onInterceptTouchEvent(MotionEvent ev) { 
    AbsListView absListView = null; 
    for (int n = 0; n < getChildCount(); n++) { 
      if (getChildAt(n) instanceof AbsListView) { 
        absListView = (ListView) getChildAt(n); 
        Logs.v("查找到listView"); 
      } 
    } 
    if (absListView == null) 
      return super.onInterceptTouchEvent(ev); 
    switch (ev.getAction()) { 
      case MotionEvent.ACTION_DOWN: 
        mStartY = ev.getRawY(); 
        break; 
      case MotionEvent.ACTION_MOVE: 
        float space = ev.getRawY() - mStartY; 
        Logs.v("space:" + space); 
        if (space > 0 && !absListView.canScrollVertically(-1) && absListView.getFirstVisiblePosition() == 0) { 
          Logs.v("攔截成功"); 
          return true; 
        } else { 
          Logs.v("不攔截"); 
          return false; 
        } 
    } 
    return super.onInterceptTouchEvent(ev); 
  } 
 
  @Override 
  public boolean onTouchEvent(MotionEvent ev) { 
    if (mLastY == -1) 
      mLastY = ev.getRawY(); 
    switch (ev.getAction()) { 
      case MotionEvent.ACTION_DOWN: 
        //記錄起始高度 
        mLastY = ev.getRawY();//記錄按下時(shí)的Y坐標(biāo) 
        break; 
      //手指離開(kāi)屏幕時(shí) 
      case MotionEvent.ACTION_UP: 
        //松開(kāi)時(shí) 
        //避免點(diǎn)擊事件觸發(fā) 
        if (!isRefreashing) 
          break; 
        //如果headView狀態(tài)處于READY狀態(tài) 則說(shuō)明松開(kāi)時(shí)應(yīng)該進(jìn)入REFRESHING狀態(tài) 
        if (mHeaderView.getStatus() == SRefreshHeader.STATE_READY) { 
          mHeaderView.setState(SRefreshHeader.STATE_REFRESHING); 
          if (mOnRefreshListener != null) 
            mOnRefreshListener.onRefresh(); 
        } 
        //根據(jù)狀態(tài)重置SrefreshLayout當(dāng)前實(shí)例和headView高度 
        resetHeadView(mHeaderView.getStatus()); 
        reset(mHeaderView.getStatus()); 
        mLastY = -1;//重置坐標(biāo) 
        break; 
      case MotionEvent.ACTION_MOVE: 
        if (!isRefreashing) 
          isRefreashing = true; 
        final float deltaY = ev.getRawY() - mLastY; 
        mLastY = ev.getRawY(); 
        updateHeaderViewHeight(deltaY / 1.8f);//按一定比例縮小移動(dòng)距離 
        updateHeight(); 
        break; 
    } 
    return super.onTouchEvent(ev); 
  } 
 
 
  private void reset(int status) { 
    ViewGroup.LayoutParams lp = getLayoutParams(); 
    switch (status) { 
      case SRefreshHeader.STATE_REFRESHING: 
        lp.height = mHeight + mHeaderViewHeight; 
        break; 
      case SRefreshHeader.STATE_NORMAL: 
        lp.height = mHeight; 
        break; 
    } 
    setLayoutParams(lp); 
  } 
 
  private void resetHeadView(int status) { 
    switch (status) { 
      case SRefreshHeader.STATE_REFRESHING: 
        mHeaderView.setVisiableHeight(mHeaderViewHeight); 
        break; 
      case SRefreshHeader.STATE_NORMAL: 
        mHeaderView.setVisiableHeight(0); 
        break; 
    } 
  } 
 
  private void updateHeight() { 
    ViewGroup.LayoutParams lp = getLayoutParams(); 
    //更新當(dāng)前l(fā)ayout實(shí)例高度為headerView高度加上最初的layout高度 
    //如果不更新layout 會(huì)造成內(nèi)容高度壓縮 無(wú)法保持比例 
    lp.height = (mHeight + mHeaderView.getVisiableHeight()); 
    setLayoutParams(lp); 
  } 
 
  private void updateHeaderViewHeight(float space) { 
//    if (space < 0) 
//      space = 0; 
//    int factHeight = (int) (space - mHeaderViewHeight); 
    if (mHeaderView.getStatus() != SRefreshHeader.STATE_REFRESHING) { 
      //如果不處于刷新中同時(shí)如果高度 
      if (mHeaderView.getVisiableHeight() < mHeaderViewHeight * 2 && mHeaderView.getStatus() != SRefreshHeader.STATE_NORMAL) { 
        mHeaderView.setState(SRefreshHeader.STATE_NORMAL); 
      } 
      if (mHeaderView.getVisiableHeight() > mHeaderViewHeight * 2 && mHeaderView.getStatus() != SRefreshHeader.STATE_READY) { 
        mHeaderView.setState(SRefreshHeader.STATE_READY); 
      } 
    } 
    mHeaderView.setVisiableHeight((int) space 
        + mHeaderView.getVisiableHeight()); 
  } 
 
 
  public void stopRefresh() { 
    if (mHeaderView.getStatus() == SRefreshHeader.STATE_REFRESHING) { 
      mHeaderView.setState(SRefreshHeader.STATE_NORMAL); 
      resetHeadView(SRefreshHeader.STATE_NORMAL); 
      reset(SRefreshHeader.STATE_NORMAL); 
    } 
  } 
 
  public void setOnRefreshListener(OnRefreshListener onRefreshListener) { 
    this.mOnRefreshListener = onRefreshListener; 
  } 
}

public class SRefreshHeader extends LinearLayout { 
  private LinearLayout mContainer; 
  private int mState = STATE_NORMAL; 
 
  private Animation mRotateUpAnim; 
  private Animation mRotateDownAnim; 
 
  private final int ROTATE_ANIM_DURATION = 500; 
 
  public final static int STATE_NORMAL = 0;//下拉刷新 
  public final static int STATE_READY = 1;//釋放刷新 
  public final static int STATE_REFRESHING = 2;//刷新中 
  private ImageView mHeadArrowImage; 
  private TextView mHeadLastRefreashTimeTxt; 
  private TextView mHeadHintTxt; 
  private TextView mHeadLastRefreashTxt; 
  private ProgressBar mRefreshingProgress; 
 
  public SRefreshHeader(Context context) { 
    super(context); 
    initView(context); 
  } 
 
  /** 
   * @param context 
   * @param attrs 
   */ 
  public SRefreshHeader(Context context, AttributeSet attrs) { 
    super(context, attrs); 
    initView(context); 
  } 
 
  private void initView(Context context) { 
    // 初始情況，設(shè)置下拉刷新view高度為0 
    LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, 0); 
    mContainer = (LinearLayout) LayoutInflater.from(context).inflate(R.layout.listview_head_view_layout, null); 
    addView(mContainer, lp); 
    setGravity(Gravity.BOTTOM); 
 
    mHeadArrowImage = (ImageView) findViewById(R.id.slistview_header_arrow); 
    mHeadLastRefreashTimeTxt = (TextView) findViewById(R.id.slistview_header_time); 
    mHeadHintTxt = (TextView) findViewById(R.id.slistview_header_hint_text); 
    mHeadLastRefreashTxt = (TextView) findViewById(R.id.slistview_header_last_refreash_txt); 
    mRefreshingProgress = (ProgressBar) findViewById(R.id.slistview_header_progressbar); 
 
    mRotateUpAnim = new RotateAnimation(0.0f, -180.0f, 
        Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 
        0.5f); 
    mRotateUpAnim.setDuration(ROTATE_ANIM_DURATION); 
    mRotateUpAnim.setFillAfter(true); 
    mRotateDownAnim = new RotateAnimation(-180.0f, 0.0f, 
        Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 
        0.5f); 
    mRotateDownAnim.setDuration(ROTATE_ANIM_DURATION); 
    mRotateDownAnim.setFillAfter(true); 
  } 
 
  public void setState(int state) { 
    if (state == mState) return; 
 
    if (state == STATE_REFRESHING) {  // 顯示進(jìn)度 
      mHeadArrowImage.clearAnimation(); 
      mHeadArrowImage.setVisibility(View.INVISIBLE); 
      mRefreshingProgress.setVisibility(View.VISIBLE); 
    } else {  // 顯示箭頭圖片 
      mHeadArrowImage.setVisibility(View.VISIBLE); 
      mRefreshingProgress.setVisibility(View.INVISIBLE); 
    } 
    switch (state) { 
      case STATE_NORMAL: 
        if (mState == STATE_READY) { 
          mHeadArrowImage.startAnimation(mRotateDownAnim); 
        } 
        if (mState == STATE_REFRESHING) { 
          mHeadArrowImage.clearAnimation(); 
        } 
        mHeadHintTxt.setText("下拉刷新"); 
        break; 
      case STATE_READY: 
        if (mState != STATE_READY) { 
          mHeadArrowImage.clearAnimation(); 
          mHeadArrowImage.startAnimation(mRotateUpAnim); 
          mHeadHintTxt.setText("松開(kāi)刷新"); 
        } 
        break; 
      case STATE_REFRESHING: 
        mHeadHintTxt.setText("正在刷新"); 
        break; 
      default: 
    } 
 
    mState = state; 
  } 
 
  public void setVisiableHeight(int height) { 
    if (height < 0) 
      height = 0; 
    LayoutParams lp = (LayoutParams) mContainer 
        .getLayoutParams(); 
    lp.height = height; 
    mContainer.setLayoutParams(lp); 
  } 
 
 
  public int getStatus() { 
    return mState; 
  } 
 
  public int getVisiableHeight() { 
    return mContainer.getHeight(); 
  } 
}

最后是布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
  android:gravity="bottom"> 
 
  <RelativeLayout 
    android:id="@+id/slistview_header_content" 
    android:layout_width="match_parent" 
    android:layout_height="60dp"> 
 
    <LinearLayout 
      android:id="@+id/slistview_header_text" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_centerInParent="true" 
      android:gravity="center" 
      android:orientation="vertical"> 
 
      <TextView 
        android:id="@+id/slistview_header_hint_text" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:text="下拉刷新" /> 
 
      <LinearLayout 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_marginTop="3dp"> 
 
        <TextView 
          android:id="@+id/slistview_header_last_refreash_txt" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="上次刷新時(shí)間" 
          android:textSize="12sp" /> 
 
        <TextView 
          android:id="@+id/slistview_header_time" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:textSize="12sp" /> 
      </LinearLayout> 
    </LinearLayout> 
 
 
    <ProgressBar 
      android:id="@+id/slistview_header_progressbar" 
      android:layout_width="30dp" 
      android:layout_height="30dp" 
      android:layout_centerVertical="true" 
      android:layout_toLeftOf="@id/slistview_header_text" 
      android:visibility="invisible" /> 
 
    <ImageView 
      android:id="@+id/slistview_header_arrow" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignLeft="@id/slistview_header_progressbar" 
      android:layout_centerVertical="true" 
      android:layout_toLeftOf="@id/slistview_header_text" 
      android:src="@drawable/mmtlistview_arrow" /> 
 
  </RelativeLayout> 
 
</LinearLayout>

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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