我基于
this tutorial实现了内容提供商的自定义建议;它有效,但是我对建议列表造型有问题.我目前的建议清单有黑色背景和白色文字.我想把它改成白色背景和黑色文字.我做了一些在线搜索,并在styles.xml文件中尝试过类似的东西:
<style name="MySearchViewStyle" parent="Widget.AppCompat.SearchView">
<item name="suggestionRowLayout">@layout/list_item_search_suggestion</item>
</style>
<style name="AppTheme" parent="@style/Theme.AppCompat.Light.NoActionBar">
<item name="searchViewStyle">@style/MySearchViewStyle</item>
</style>
我的list_item_search_suggestion看起来像这样:
<?xml version="1.0" encoding="utf-8"?>
<TextView
android:id="@android:id/text1"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/white"
android:gravity="center_vertical"
android:minHeight="56dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:textAppearance="?android:attr/textAppearanceListItemSmall"
android:textColor="@android:color/black"
tools:text="Blah blah blah"/>
但是,当我运行应用程序并搜索某些内容时,它会在建议列表显示之前崩溃.我从SuggestionsAdapter中的newView方法得到一个NullPointerException.这个SuggestionAdapter来自SDK,我没有实现自己的适配器.我只是实现内容提供程序并在searchable.xml中设置它.堆栈轨道也是这样的:
06-15 21:11:09.253 4063-4063/com.tophatter E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.tophatter, PID: 4063
java.lang.NullPointerException
at android.support.v7.widget.SuggestionsAdapter.newView(SuggestionsAdapter.java:249)
at android.support.v7.widget.SuggestionsAdapter.getView(SuggestionsAdapter.java:453)
at android.widget.AbsListView.obtainView(AbsListView.java:2255)
at android.widget.ListPopupWindow$DropDownListView.obtainView(ListPopupWindow.java:1585)
at android.widget.ListView.measureHeightOfChildren(ListView.java:1263)
at android.widget.ListPopupWindow.buildDropDown(ListPopupWindow.java:1167)
at android.widget.ListPopupWindow.show(ListPopupWindow.java:554)
at android.widget.AutoCompleteTextView.showDropDown(AutoCompleteTextView.java:1096)
at android.widget.AutoCompleteTextView.updateDropDownForFilter(AutoCompleteTextView.java:971)
at android.widget.AutoCompleteTextView.onFilterComplete(AutoCompleteTextView.java:953)
at android.widget.Filter$ResultsHandler.handleMessage(Filter.java:285)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
最佳答案 我想通了.基本上,SuggestionsAdapter引用了我在自定义建议行布局中未提供的一些小部件.所以我从源代码复制了默认的自定义建议行布局,并将背景和文本颜色更改为我的自定义布局.它现在正在运作.