问题
I have implemented Navigation Drawer based on a ListView. It works perfectly fine with ICS and above versions of Android. However, on older versions, it crashes with this error:
06-23 15:50:11.570: E/AndroidRuntime(403): Caused by:
android.content.res.Resources$NotFoundException:
File res/drawable/list_selector_background.xml
from xml type drawable resource ID #0x0
I have tried copying this particular xml file from Android sdk to my own project, but that didn't help.
Here's the xml file(abridged):
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView
android:id="@+id/left_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="#dddddd"
android:choiceMode="singleChoice"
android:divider="@color/gray"
android:dividerHeight="1dp" />
</android.support.v4.widget.DrawerLayout>
And the code:
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
mDrawerLayout.openDrawer(mDrawerList);
The complete stack trace:
Uncaught handler: thread main exiting due to uncaught exception
android.view.InflateException:
Binary XML file line #1: Error inflating class <unknown>
at android.view.LayoutInflater.createView(LayoutInflater.java:513)
at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563)
at android.view.LayoutInflater.inflate(LayoutInflater.java:385)
at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:332)
at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323)
at android.widget.AbsListView.obtainView(AbsListView.java:1274)
at android.widget.ListView.makeAndAddView(ListView.java:1668)
at android.widget.ListView.fillDown(ListView.java:637)
at android.widget.ListView.fillFromTop(ListView.java:694)
at android.widget.ListView.layoutChildren(ListView.java:1521)
at android.widget.AbsListView.onLayout(AbsListView.java:1113)
at android.view.View.layout(View.java:6830)
at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:672)
at android.view.View.layout(View.java:6830)
at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
at android.view.View.layout(View.java:6830)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998)
at android.widget.LinearLayout.onLayout(LinearLayout.java:918)
at android.view.View.layout(View.java:6830)
at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
at android.view.View.layout(View.java:6830)
at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
at android.view.View.layout(View.java:6830)
at android.view.ViewRoot.performTraversals(ViewRoot.java:996)
at android.view.ViewRoot.handleMessage(ViewRoot.java:1633)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4363)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at android.widget.TextView.<init>(TextView.java:320)
at java.lang.reflect.Constructor.constructNative(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:446)
at android.view.LayoutInflater.createView(LayoutInflater.java:500)
... 35 more
Caused by: android.content.res.Resources$NotFoundException:
File res/drawable/list_selector_background.xml from drawable resource ID #0x0
at android.content.res.Resources.loadDrawable(Resources.java:1693)
at android.content.res.TypedArray.getDrawable(TypedArray.java:548)
at android.view.View.<init>(View.java:1850)
at android.widget.TextView.<init>(TextView.java:326)
... 39 more
Caused by: android.content.res.Resources$NotFoundException:
File res/drawable/list_selector_background.xml
from xml type drawable resource ID #0x0
at android.content.res.Resources.loadXmlResourceParser(Resources.java:1920)
at android.content.res.Resources.loadDrawable(Resources.java:1688)
... 42 more
回答1:
The official Google example for Navigation drawer, gives this TextView as part of drawer_list_item.xml
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:textAppearance="?android:attr/textAppearanceListItemSmall"
android:background="?android:attr/activatedBackgroundIndicator"
android:minHeight="?android:attr/listPreferredItemHeightSmall"/>
However, with these exact three values of attributes, the application fails on pre-ICS android OSes. I verified by giving my own custom values(anything different from these) and it works like magic on every version.
回答2:
The official Navigation drawer example has a minimum API-level of 14. In case this minimum is set to an ICS-version (for example 11) this will result in a forced close as method setHomeButton is only avaible as of API-14.
getActionBar().setHomeButtonEnabled(true);
When commenting out the previous statement this results in inflate exception which is a result of using adroid dimensions which are also added in API-14.
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:textAppearance="?android:attr/textAppearanceListItemSmall"
android:background="?android:attr/activatedBackgroundIndicator"
android:minHeight="?android:attr/listPreferredItemHeightSmall"/>
For my app in which I support API-11+ I have solved this as follows.
1) In drawer_list_item.xml refer to custom attributes
<?xml version="1.0" encoding="UTF-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/text1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/myapp_activatedBackgroundIndicator"
android:gravity="center_vertical"
android:minHeight="?attr/myapp_listPreferredItemHeightSmall"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:textAppearance="?attr/myapp_textAppearanceListItemSmall" />
2) In values/attrs.xml define your custom attributes
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="Theme">
<!-- Attributes below are needed to support the navigation drawer on Android 3.x. -->
<!-- A smaller, sleeker list item height. -->
<attr name="myapp_listPreferredItemHeightSmall" format="dimension" />
<!-- Drawable used as a background for activated items. -->
<attr name="myapp_activatedBackgroundIndicator" format="reference" />
<!-- The preferred TextAppearance for the primary text of small list items. -->
<attr name="myapp_textAppearanceListItemSmall" format="reference" />
</declare-styleable>
</resources>
3) In values-11/styles.xml
<resources>
<!-- Base application theme for API 11+. This theme completely replaces -->
<!-- AppBaseTheme from res/values/styles.xml on API 11+ devices. -->
<style name="AppBaseTheme" parent="android:Theme.Holo">
<!-- API 11 theme customizations can go here. -->
<!-- Implementation of attributes needed for the navigation drawer as the default implementation is based on API-14. -->
<item name="myapp_listPreferredItemHeightSmall">48dip</item>
<item name="myapp_textAppearanceListItemSmall">@style/MyappDrawerMenu</item>
<item name="myapp_activatedBackgroundIndicator">@drawable/ab_transparent_action_bar</item>
</style>
<style name="MyappDrawerMenu">
<item name="android:textSize">16sp</item>
<item name="android:textStyle">bold</item>
<item name="android:textColor">?android:attr/actionMenuTextColor</item>
</style>
</resources>
4) In values-v14/styles.xml
<resources>
<!-- Base application theme for API 14+. This theme completely replaces -->
<!-- AppBaseTheme from BOTH res/values/styles.xml and -->
<!-- res/values-v11/styles.xml on API 14+ devices. -->
<style name="AppBaseTheme" parent="android:Theme.Holo">
<!-- For API-14 and above the default implementation of the navigation drawer menu is used. Below APU-14 a custom implementation is used. -->
<item name="myapp_listPreferredItemHeightSmall">?android:attr/listPreferredItemHeightSmall</item>
<item name="myapp_textAppearanceListItemSmall">?android:attr/textAppearanceListItemSmall</item>
<item name="myapp_activatedBackgroundIndicator">?android:attr/activatedBackgroundIndicator</item>
</style>
</resources>
In case you want to support older/other versions, you will need to add a styles.xml for that specific version.
来源：https://stackoverflow.com/questions/17261230/navigation-drawer-not-working-on-pre-ics-versions