標籤：
一、機制ListView機制 - 先執行getCount，然後執行getView。如果getCount返回0，不執行getViewGallery convertView不會複用，每次都返回NULL
二、問題整理ListView最下面一個item沒有橫線（Divider）？listview的布局高使用wrap_content，應該使用fill_parent
去除行與行之間的黑線：List.setDivider(null);
切記ListView高度不能設定成wrap_content會導致多次整個頁面重新整理
動態修改Item高度 - ItemRootView.getLayoutParams().height = heightValue; 嘗試使用margin、Child height都無效
Item Root設定高度失效，可以通過設定子視圖高度解決。（ListView ItemView 子視圖設定margin無效）兩層，內層使用margin，外層使用FrameLayout失效，改成Linearlayout有效。例如Htc G12 就會失效。
三、常用屬性
ListView Item selectoritem.xml 外層LinearLayout設定selector.xml後，內層再設定bakcground沒有選中效果。 因為點擊後下層其實改變了，但是被上層給蓋住了，這是常識。。。。。點擊父視圖，子視圖是否被選中，例如button
去除選中時的黃色底色
android:listSelector="#00000000" android:listSelector="@null" // 這樣設定無效
1. 是否顯示ScrollBar
2. 關閉OverScroll ， 有些手機上OverScroll有類似FadingEdge效果listView.setOverScrollMode(View.OVER_SCROLL_NEVER);
3. 去除拖動時預設的黑色背景：
android:cacheColorHint="#00000000"
5. ListView重新整理後自動滾到最底部：
List.setSelection(msgList.getAdapter().getCount()-1);
6. 去除ListView滑到頂部和底部時邊緣的黑色陰影：
android:fadingEdge="none"
** 異常get item type 從0開始，出現以下異常說明，getItemViewType 傳回型別個數超過getViewTypeCount。當前異常是getItemViewType 返回3種類型的id，而getViewTypeCount = 2
java.lang.ArrayIndexOutOfBoundsException: length=2; index=2
at android.widget.AbsListView$RecycleBin.addScrapView(AbsListView.java:7188)
at android.widget.ListView.measureHeightOfChildren(ListView.java:1338)
at android.widget.ListView.onMeasure(ListView.java:1238)
at android.view.View.measure(View.java:15729)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4854)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:15729)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:645)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:425)
at android.view.View.measure(View.java:15729)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4854)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:15729)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4854)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:15729)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4854)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2344)
at android.view.View.measure(View.java:15729)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1948)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1104)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1300)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4498)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
at android.view.Choreographer.doCallbacks(Choreographer.java:562)
at android.view.Choreographer.doFrame(Choreographer.java:532)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5105)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
onScroll 滾動狀態判斷onScrollListenerSCROLL_STATE_IDLE 滑動後靜止
SCROLL_STATE_FLING 手指離開螢幕後，慣性滑動
SCROLL_STATE_TOUCH_SCROLL 手指在螢幕上滑動
測試相關ActivityThread中代碼，此代碼調用onSaveInstanceState。mInstrumentation負責調用on***方法mInstrumentation.callActivityOnSaveInstanceState(r.activity, state);
GridVie 不顯示捲軸
android:scrollbars="none"與
setVerticalScrollBarEnabled(true);
Android ListView 常見問題與使用總結
