我在尝试创建LinearLayout的子类时遇到问题。我有这个布局的一个简单的片段
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/map_container"
>
<!-- Map view -->
<org.osmdroid.views.MapView
android:id="@+id/fragment_map_map_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"/>
<!-- Record description -->
<com.example.SmallRecordDetailsWidget
android:id="@+id/fragment_map_record_detail"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</FrameLayout>
SmallRecordDetailsWidget是LinearLayout的子类。
我的问题是我找不到正确的方法来实例化/膨胀它。
这是我的SmallRecordDetailsWidget现在的样子
public class SmallRecordDetailsWidget extends LinearLayout {
private final int layoutID = R.layout.small_record_details;
public SmallRecordDetailsWidget(Context context, AttributeSet attrs) {
super(context, attrs);
LayoutInflater.from(context).inflate(this.layoutID, this, true) ;
}
}
然后在片段的onCreateView中，我正在做：
@Override
public View onCreateView(
LayoutInflater inflater, ViewGroup containter, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_map, containter, false) ;
this.mapView = (MapView)( view.findViewById(R.id.fragment_map_map_view) );
this.recordDetailsWidget = (SmallRecordDetailsWidget)( view.findViewById(R.id.fragment_map_record_detail) ) ;
return view;
}
但这代码在
View view = inflater.inflate(...)上制动android.view.InflateException: Binary XML file line #18: Error inflating class com.lexues.android.hari_prototype.views.SmallRecordDetailsWidget
我可以追踪到被扔
LayoutInflater.from(context).inflate(this.layoutID, this, true) ;SmallRecordDetailsWidget的构造函数中的一行。充气机即使在简单的简单布局下也无法运行，就像这样 <?xml version="1.0" encoding="utf-8"?>
<!-- A widget with details of selected point of interest. This will be placed at the bottom of the map widget -->
<com.lexues.android.hari_prototype.views.SmallRecordDetailsWidget xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/small_record_details_layout"
android:layout_width="match_parent"
android:layout_height="82dp">
</com.lexues.android.hari_prototype.views.SmallRecordDetailsWidget>
现在，我将问题简化为可重现该问题的最小情况，因此看起来我在这里没有做任何有用的事情，但是目标是
SmallRecordDetailsWidget有一些简单的成员小部件，然后再做一些与他们一起工作。如果我能正确理解它们，只要在SmallRecordDetailsWidget的构造函数膨胀的布局文件中定义它们（作为根元素的子代），那么它们也应该膨胀，以便以后可以通过。编辑-添加了堆栈跟踪和一些额外的细节
堆栈跟踪为：
09-01 09:24:18.661 6330-6330/com.lexues.android.hari_prototype E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.lexues.android.hari_prototype, PID: 6330
android.view.InflateException: Binary XML file line #18: Error inflating class com.lexues.android.hari_prototype.views.SmallRecordDetailsWidget
at android.view.LayoutInflater.createView(LayoutInflater.java:626)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:702)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
at android.view.LayoutInflater.inflate(LayoutInflater.java:498)
at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
at com.lexues.android.hari_prototype.controllers.fragments.MapFragment.onCreateView(MapFragment.java:87)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:938)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:478)
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
at android.view.View.measure(View.java:17396)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5365)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:17396)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5365)
at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:382)
at android.view.View.measure(View.java:17396)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5365)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2505)
at android.view.View.measure(View.java:17396)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2175)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1316)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1513)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1200)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6401)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:803)
at android.view.Choreographer.doCallbacks(Choreographer.java:603)
at android.view.Choreographer.doFrame(Choreographer.java:573)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:789)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5335)
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:1265)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.constructNative(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at android.view.LayoutInflater.createView(LayoutInflater.java:600)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:702)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
at android.view.LayoutInflater.inflate(LayoutInflater.java:498)
at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
at com.lexues.android.hari_prototype.controllers.fragments.MapFragment.onCreateView(MapFragment.java:87)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:938)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:478)
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
at android.view.View.measure(View.java:17396)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5365)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:17396)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5365)
at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:382)
at android.view.View.measure(View.java:17396)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5365)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2505)
at android.view.View.measure(View.java:17396)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2175)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1316)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1513)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1200)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6401)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:803)
at android.view.Choreographer.doCallbacks(Choreographer.java:603)
at android.view.Choreographer.doFrame(Choreographer.java:573)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:789)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5335)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #5: Error inflating class <unknown>
at android.view.LayoutInflater.createView(LayoutInflater.java:626)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:702)
at android.view.LayoutInflater.inflate(LayoutInflater.java:470)
at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
at com.lexues.android.hari_prototype.views.SmallRecor
09-01 09:24:19.381 882-6350/? E/android.os.Debug﹕ !@Dumpstate > sdumpstate -k -t -z -d -o /data/log/dumpstate_app_error
09-01 09:24:20.361 267-267/? E/SMD﹕ DCD ON
如我发布的代码所述，在
findViewById(...)的构造函数中，我为布局SmallRecordDetailsWidget充气，其中R.layout.small_record_details是定义小部件的xml（而small_record_details.xml是其根标记的名称）。只是为了阐明我的目标-我想创建一个包含其他一些小部件。我希望在xml中为“复合窗口小部件”定义所有它们，然后在构造函数中获取对子窗口小部件的引用，以便客户端可以执行
com.lexues.android.hari_prototype.views.SmallRecordDetailsWidget等操作。 最佳答案
阅读您的问题，似乎您正在夸大SmallRecordDetailsWidget构造函数中的错误布局。
在那里，您不应该使用标签
<com.lexues.android.hari_prototype.views.SmallRecordDetailsWidget>
当您从片段中放大/实例化自定义布局时，可以使用该标签，而在放大小视图层次结构并将其附加到自定义布局时，则不能使用该标签。视图层次结构不应包含该标签，请尝试在layout / small_record_details.xml中放置类似TextView的内容