ListView測量導致不斷的getView（..）請求，減慢設備

此處描述的問題在3.0以及3.035上遇到3.1宏碁Iconia A500遇到。以下佈局用於片段（不是 ListFragment）。不知它導致一個ListView，加入到 fragment_swipeview_lr_leftview_body（分別 fragment_swipeview_lr_rightview_body），待一遍一遍測量，從而刷新其內容更頻繁然後需要並因此顯著減緩裝置。ListView測量導致不斷的getView（..）請求，減慢設備

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/fragment_swipeview_lr_mainlayout" android:layout_height="fill_parent" android:layout_width="fill_parent"> 
    <RelativeLayout android:id="@+id/fragment_swipeview_lr_leftview" 
     android:layout_height="fill_parent" android:layout_width="wrap_content" 
     android:layout_marginRight="5dip"> 
     <RelativeLayout android:layout_height="wrap_content" 
      android:id="@+id/fragment_swipeview_lr_leftview_header" 
      android:layout_alignParentTop="true" android:layout_centerHorizontal="true" 
      android:background="@drawable/fragment_swipeview_header_background_left" 
      android:layout_width="wrap_content" android:layout_alignLeft="@+id/fragment_swipeview_lr_leftview_body" 
      android:layout_alignRight="@+id/fragment_swipeview_lr_leftview_body"> 
      <TextView android:layout_width="wrap_content" 
       android:layout_height="wrap_content" android:id="@+id/fragment_swipeview_vt_leftview_headertext" 
       android:text="Left Heading" android:textAppearance="@style/style_text_swipeview_header" 
       android:layout_marginLeft="10dip"></TextView> 
     </RelativeLayout> 
     <RelativeLayout android:background="@drawable/fragment_swipeview_body_background_left" 
      android:layout_height="fill_parent" android:layout_below="@id/fragment_swipeview_lr_leftview_header" 
      android:layout_width="wrap_content" android:id="@+id/fragment_swipeview_lr_leftview_body"></RelativeLayout> 
    </RelativeLayout> 
    <RelativeLayout android:layout_height="fill_parent" 
     android:layout_toRightOf="@+id/fragment_swipeview_lr_leftview" 
     android:layout_width="wrap_content" android:id="@+id/fragment_swipeview_lr_rightview"> 
     <RelativeLayout android:layout_height="wrap_content" 
      android:layout_width="wrap_content" android:id="@+id/fragment_swipeview_lr_header_body_wrapper" 
      android:layout_toRightOf="@+id/fragment_swipeview_vi_rightview_shadow"> 
      <RelativeLayout android:layout_alignLeft="@+id/fragment_swipeview_lr_rightview_body" 
       android:layout_alignRight="@+id/fragment_swipeview_lr_rightview_body" 
       android:layout_height="wrap_content" android:layout_centerHorizontal="true" 
       android:layout_width="wrap_content" android:layout_alignParentTop="true" 
       android:id="@+id/fragment_swipeview_lr_rightview_header" 
       android:background="@drawable/fragment_swipeview_header_background_right"> 
       <TextView android:text="Right Heading" android:layout_height="wrap_content" 
        android:layout_marginLeft="10dip" android:textAppearance="@style/style_text_swipeview_header" 
        android:layout_width="wrap_content" android:id="@+id/fragment_swipeview_vt_rightview_headertext"></TextView> 
      </RelativeLayout> 
      <RelativeLayout android:layout_height="fill_parent" 
       android:layout_width="wrap_content" android:layout_below="@+id/fragment_swipeview_lr_rightview_header" 
       android:id="@+id/fragment_swipeview_lr_rightview_body" 
       android:background="@drawable/fragment_swipeview_body_background_right"></RelativeLayout> 
     </RelativeLayout> 
     <ImageView android:background="@drawable/general_shadow_left" 
      android:layout_width="wrap_content" android:layout_height="fill_parent" 
      android:layout_alignParentLeft="true" 
      android:id="@+id/fragment_swipeview_vi_rightview_shadow" 
      android:visibility="gone"></ImageView> 
    </RelativeLayout> 
</RelativeLayout>

的ListView中使用以下代碼（使用顯式 LayoutParameters以及試過）加入。

public void addViewToLeftContentLayout(View v) { 
    leftContent.addView(v); // leftcontent == fragment_swipeview_lr_leftview_body 
    fragment_swipeview_lr_leftview_body 
}

這裏是表示各個測量更新棧跟蹤：

AdapterIngredientList.getView(int, View, ViewGroup) line: 43 
ListView(AbsListView).obtainView(int, boolean[]) line: 1970 
ListView.measureHeightOfChildren(int, int, int, int, int) line: 1228 
ListView.onMeasure(int, int) line: 1139 
ListView(View).measure(int, int) line: 10828 
RelativeLayout.measureChild(View, RelativeLayout$LayoutParams, int, 
int) line: 566 
RelativeLayout.onMeasure(int, int) line: 381 
RelativeLayout(View).measure(int, int) line: 10828 
RelativeLayout.measureChildHorizontal(View, RelativeLayout 
$LayoutParams, int, int) line: 581 
RelativeLayout.onMeasure(int, int) line: 365 
RelativeLayout(View).measure(int, int) line: 10828 
RelativeLayout.measureChildHorizontal(View, RelativeLayout 
$LayoutParams, int, int) line: 581 
RelativeLayout.onMeasure(int, int) line: 365 
RelativeLayout(View).measure(int, int) line: 10828 
RelativeLayout.measureChildHorizontal(View, RelativeLayout 
$LayoutParams, int, int) line: 581 
RelativeLayout.onMeasure(int, int) line: 365 
RelativeLayout(View).measure(int, int) line: 10828 
RelativeLayout.measureChildHorizontal(View, RelativeLayout 
$LayoutParams, int, int) line: 581 
RelativeLayout.onMeasure(int, int) line: 365 
RelativeLayout(View).measure(int, int) line: 10828 
RelativeLayout.measureChildHorizontal(View, RelativeLayout 
$LayoutParams, int, int) line: 581 
RelativeLayout.onMeasure(int, int) line: 365 
RelativeLayout(View).measure(int, int) line: 10828 
RelativeLayout.measureChildHorizontal(View, RelativeLayout 
$LayoutParams, int, int) line: 581 
RelativeLayout.onMeasure(int, int) line: 365 
RelativeLayout(View).measure(int, int) line: 10828 
RelativeLayout.measureChildHorizontal(View, RelativeLayout 
$LayoutParams, int, int) line: 581 
RelativeLayout.onMeasure(int, int) line: 365 
RelativeLayout(View).measure(int, int) line: 10828 
RelativeLayout.measureChildHorizontal(View, RelativeLayout 
$LayoutParams, int, int) line: 581 
RelativeLayout.onMeasure(int, int) line: 365 
RelativeLayout(View).measure(int, int) line: 10828 
RelativeLayout.measureChildHorizontal(View, RelativeLayout 
$LayoutParams, int, int) line: 581 
RelativeLayout.onMeasure(int, int) line: 365 
RelativeLayout(View).measure(int, int) line: 10828 
LinearLayout(ViewGroup).measureChildWithMargins(View, int, int, int, 
int) line: 4351 
LinearLayout.measureChildBeforeLayout(View, int, int, int, int, int) 
line: 1284 
LinearLayout.measureVertical(int, int) line: 613 
LinearLayout.onMeasure(int, int) line: 519 
LinearLayout(View).measure(int, int) line: 10828 
FrameLayout(ViewGroup).measureChildWithMargins(View, int, int, int, 
int) line: 4351 
FrameLayout.onMeasure(int, int) line: 267 
FrameLayout(View).measure(int, int) line: 10828 
LinearLayout.measureVertical(int, int) line: 764 
LinearLayout.onMeasure(int, int) line: 519 
LinearLayout(View).measure(int, int) line: 10828 
PhoneWindow$DecorView(ViewGroup).measureChildWithMargins(View, int, 
int, int, int) line: 4351 
PhoneWindow$DecorView(FrameLayout).onMeasure(int, int) line: 267 
PhoneWindow$DecorView.onMeasure(int, int) line: 1908 
PhoneWindow$DecorView(View).measure(int, int) line: 10828 
ViewRoot.performTraversals() line: 909 
ViewRoot.handleMessage(Message) line: 2003 
ViewRoot(Handler).dispatchMessage(Message) line: 99 
Looper.loop() line: 132 
ActivityThread.main(String[]) line: 4026 
Method.invokeNative(Object, Object[], Class, Class[], Class, int, 
boolean) line: not available [native method] 
Method.invoke(Object, Object...) line: 491 
ZygoteInit$MethodAndArgsCaller.run() line: 841 
ZygoteInit.main(String[]) line: 599 
NativeStart.main(String[]) line: not available [native method]

任何建議/變通辦法，將不勝感激。關於帕特里克

來源

2011-08-22 Patrick Sturm

我相信這是因爲您正在使用wrap_content佈局寬度/高度。它需要一次調用才能獲得測量值，然後需要另一次調用來實際測量所需的值。如果可能，請嘗試更改佈局以使用fill_parent。

來源

2011-08-22 17:41:25

不幸的是，將wrap_content更改爲fill_parent不是一個選項。我只是簡化了佈局，現在就開始工作。非常感謝 –

ListView測量導致不斷的getView（..）請求，減慢設備

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