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 Android教程網 >> Android技術 >> 關於Android編程 >> Android RefreshLayout實現下拉刷新布局

Android RefreshLayout實現下拉刷新布局

編輯:關於Android編程

項目中需要下拉刷新的功能,但是這個View不是ListView這類的控件,需要ViewGroup實現這個功能,一開始網上大略找了一下,沒發現特別合適的,代碼也是沒怎麼看懂,所以決定還是自己寫一個。

  於是翻出XlistView的源碼看是一點一點看,再大致理解了XLisview源碼,終於決定自己動手啦

  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,肯定是先實現下拉功能,最開始我是打算通過 extends ScrollView 來實現,因為有現成的滾動效果嘛,可是實際因為兩個原因放棄了:

1、ScrollView下只能有一個子控件View ,雖然在    Scroll下添加一個ViewGroup,然後講headView動態添加進前面的ViewGroup,但是我還是比較習慣studio的可視化預覽,總覺得不直觀!

2、  ScrollView內嵌ListView時會發生    沖突,還需要去重寫ListView。於是放棄換個思路!

 關於上面的原因1:動態添加headView進ScrollView的中GroupView中,可以在重寫ScrollView的onViewAdded()方法,將初始化時解析的headView添加進子GroupView

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

  換個思路,通過extends LinearLayout來實現吧!
先做准備工作,我們需要一個HeaderView以及要獲取到HeaderView的高度,還有初始時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);
通過構造方法實例化HeaderView

mHeaderViewContent = (RelativeLayout)

mHeaderView.findViewById(R.id.slistview_header_content);

 這是解析headerView內容區域iew,等會兒要獲取這個view的高度,你肯定會問為啥不用上面的mHeaderView來獲取高度,點進構造方法裡可以看到如下代碼

// 初始情況,設置下拉刷新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當前實例的高度 
  */ 
  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); 
      } 
    }); 
  } 

准備工作完成了,接下來就是要成下拉操作了
到這裡,肯定一下就想到了onTouchEvent()方法,是的!現在就開始在這裡施工

實現下拉一共 會經歷三個過程
ACTION_UP→ACTION_MOVE→ACTION_UP
在ACTION_UP事件中,也就是手指按下的時候,我們需要做的只是記錄按下時候的坐標

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

然後就是ACTION_MOVE事件了,這裡是最重要的,因為下拉時HeadView和Layout的高度變化都在這裡進行

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距離 
       updateHeight(); 
       break; 

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

 private void updateHeight() { 
    ViewGroup.LayoutParams lp = getLayoutParams(); 
    //更新當前layout實例高度為headerView高度加上最初的layout高度 
    //如果不更新layout 會造成內容高度壓縮 無法保持比例 
    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) { 
      //如果不處於刷新中同時如果高度 
      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,通過下拉的距離來判斷是否到達刷新的距離,上面代碼中我設定的是到達mHeaderView初始高度的兩倍,就進入“釋放刷新”的狀態,如果沒有達到則保持“下拉刷新”的狀態
HeaderView中的狀態一共設定了3個分別是

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的距離重新賦給headerView或者layout

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

最後就是ACTION_UP事件了就是手指離開屏幕的時候,在這裡我們需要根據headerView目前狀態來決定headerView的最終狀態!

case MotionEvent.ACTION_UP: 
        //松開時 
        //避免點擊事件觸發 
        if (!isRefreashing) 
          break; 
        //如果headView狀態處於READY狀態 則說明松開時應該進入REFRESHING狀態 
        if (mHeaderView.getStatus() == SRefreshHeader.STATE_READY) { 
          mHeaderView.setState(SRefreshHeader.STATE_REFRESHING); 
        } 
        //根據狀態重置SrefreshLayout當前實例和headView高度 
        resetHeadView(mHeaderView.getStatus()); 
        reset(mHeaderView.getStatus()); 
        mLastY = -1;//重置坐標 
        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; 
    } 
  } 

實現方式也是一樣的。根據狀態來判斷,如果是處於刷新中,那headerView應該正常顯示,並且高度是初始的高度,如果處於NORMAL,也就是"下拉刷新"狀態,那麼說未觸發刷新,重置時,headerView應該被隱藏,也就是高度重置為0

到這裡下拉刷新操作也基本完成了,還需要加一個回調接口進行通知

interface OnRefreshListener { 
    void onRefresh(); 
  } 

case MotionEvent.ACTION_UP: 
        //松開時 
        //避免點擊事件觸發 
        if (!isRefreashing) 
          break; 
        //如果headView狀態處於READY狀態 則說明松開時應該進入REFRESHING狀態 
        if (mHeaderView.getStatus() == SRefreshHeader.STATE_READY) { 
          mHeaderView.setState(SRefreshHeader.STATE_REFRESHING); 
          if (mOnRefreshListener != null) 
            mOnRefreshListener.onRefresh(); 
        } 
        //根據狀態重置SrefreshLayout當前實例和headView高度 
        resetHeadView(mHeaderView.getStatus()); 
        reset(mHeaderView.getStatus()); 
        mLastY = -1;//重置坐標 
        break; 

好,到這裡就基本完成了,試試效果吧。咦,發現一個問題,嵌套ListView的時候為什麼這個Layout不能執行下拉刷新!仔細想想應該是事件分發的問題,還需要處理一下事件的攔截!
關於事件攔截的處理,閱讀了鴻洋大神寫的viewgroup事件分發的博客和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即移動的距離 canScrollVertically()是判斷ListView能否在垂直方向上滾動,參數為負數時代表向上,為正數時代碼向下滾動,最後一個就是ListView第一個可見的item的postion

加上上面的事件攔截處理,一個可以滿足開頭提到的需求的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當前實例的高度 
   */ 
  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();//記錄按下時的Y坐標 
        break; 
      //手指離開屏幕時 
      case MotionEvent.ACTION_UP: 
        //松開時 
        //避免點擊事件觸發 
        if (!isRefreashing) 
          break; 
        //如果headView狀態處於READY狀態 則說明松開時應該進入REFRESHING狀態 
        if (mHeaderView.getStatus() == SRefreshHeader.STATE_READY) { 
          mHeaderView.setState(SRefreshHeader.STATE_REFRESHING); 
          if (mOnRefreshListener != null) 
            mOnRefreshListener.onRefresh(); 
        } 
        //根據狀態重置SrefreshLayout當前實例和headView高度 
        resetHeadView(mHeaderView.getStatus()); 
        reset(mHeaderView.getStatus()); 
        mLastY = -1;//重置坐標 
        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(); 
    //更新當前layout實例高度為headerView高度加上最初的layout高度 
    //如果不更新layout 會造成內容高度壓縮 無法保持比例 
    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) { 
      //如果不處於刷新中同時如果高度 
      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(); 
  } 
} 

最後是布局文件

<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> 

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