針對Android微調控制檯的自定義佈局問題

Question

我知道圍繞自定義微調控制器進行了很多討論，但是我仍然無法掌握如何去做。我想要的是一個微調控制器，它具有下拉菜單項的自定義佈局和未激活時微調控件的自定義佈局。當應用程序運行時，微調器具有特定的佈局（當未激活時），但是當它被激活時會崩潰，這使我相信xml可能存在問題。但它在這裏（順便說一句，我使用單聲道和C＃）;

我創建一個ArrayAdapter的微調這樣，我在那裏的微調Resource.Layout.SpinnerView和下拉Resource.Layout.SpinnerRow設置佈局：

ArrayAdapter spinnerArrayAdapter = new ArrayAdapter(this.Context,Resource.Layout.SpinnerView,Resource.Id.spinnertext,_listOfUmbracoItems);  
spinnerArrayAdapter.SetDropDownViewResource(Resource.Layout.SpinnerRow); 

Resource.Layout.SpinnerView：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:local="http://schemas.android.com/apk/res/dk.appsfabrikken.cmsapp" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    > 
    <ImageView 
     android:src="@drawable/eduvalg" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:scaleType="centerInside" 
     android:padding="0.0dp" 
     android:layout_alignParentTop="true" 
     android:id="@+id/backgroundimageview" /> 
    <TextView 
     android:id="@+id/spinnertext" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:gravity="center" 
     android:layout_marginTop="0.0dp" /> 
</RelativeLayout> 

Resource.Layout.SpinnerRow：

<?xml version="1.0" encoding="utf-8"?> 
    <TextView xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="wrap_content" 
     android:layout_centerInParent="true" 
     android:background="@drawable/down" 
     android:gravity="center" 
     android:layout_height="wrap_content" /> 

而且我微調添加到活動佈局與下面的XML：

<CmsApp.Droid.Controls.UmbracoSpinner 
     android:id="@+id/spinnerMenu" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:background="@android:color/transparent" 
     android:drawSelectorOnTop="true" 
     /> 

我試圖用的samelayout Resource.Layout.SpinnerView兩個，然後應用程序不會chrash - 不過後來我就沒有正確的自定義下拉項目的佈局。

我希望有人能幫助我，並指出我的方向正確。

---更新--- 以下是日誌當我崩潰，它似乎是一個我不完全理解的空指針。

04-26 22:45:47.423: E/AndroidRuntime(11536): FATAL EXCEPTION: main 
04-26 22:45:47.423: E/AndroidRuntime(11536): java.lang.NullPointerException 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:353) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.ArrayAdapter.getDropDownView(ArrayAdapter.java:376) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.Spinner$DropDownAdapter.getDropDownView(Spinner.java:329) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.Spinner$DropDownAdapter.getView(Spinner.java:325) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.AbsListView.obtainView(AbsListView.java:1315) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.ListView.measureHeightOfChildren(ListView.java:1198) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.ListView.onMeasure(ListView.java:1109) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.view.View.measure(View.java:8171) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.LinearLayout.measureVertical(LinearLayout.java:381) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.view.View.measure(View.java:8171) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.LinearLayout.measureVertical(LinearLayout.java:381) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at com.android.internal.widget.WeightedLinearLayout.onMeasure(WeightedLinearLayout.java:60) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.view.View.measure(View.java:8171) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.view.View.measure(View.java:8171) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.view.View.measure(View.java:8171) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.view.ViewRoot.performTraversals(ViewRoot.java:801) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.view.ViewRoot.handleMessage(ViewRoot.java:1727) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.os.Handler.dispatchMessage(Handler.java:99) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.os.Looper.loop(Looper.java:123) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at android.app.ActivityThread.main(ActivityThread.java:4627) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at java.lang.reflect.Method.invokeNative(Native Method) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at java.lang.reflect.Method.invoke(Method.java:521) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
04-26 22:45:47.423: E/AndroidRuntime(11536): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

好的傢伙，我解決了它自己，它可能是一個新手的錯誤，我不知道。我需要對我的佈局xml文件進行更改。 textview的id需要相同，否則會導致空指針異常。

我已經改變了我的XML以下

Resource.Layout.SpinnerView：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:local="http://schemas.android.com/apk/res/dk.appsfabrikken.cmsapp" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    > 
    <ImageView 
     android:src="@drawable/eduvalg" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:scaleType="centerInside" 
     android:padding="0.0dp" 
     android:layout_alignParentTop="true" 
     android:id="@+id/backgroundimageview" /> 
    <TextView 
     android:id="@+id/spinnertext" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:gravity="center" 
     android:layout_marginTop="0.0dp" /> 
</RelativeLayout> 

Resource.Layout.SpinnerRow：

<?xml version="1.0" encoding="utf-8"?> 
    <TextView xmlns:android="http://schemas.android.com/apk/res/android" 
     android:id="@+id/spinnertext" 
     android:layout_width="wrap_content" 
     android:layout_centerInParent="true" 
     android:background="@drawable/down" 
     android:gravity="center" 
     android:layout_height="wrap_content" /> 

Answer 2

也許在你的Resource.Layout.SpinnerRow TextView的必須checkedtextview