我已经基于ListView实现了导航抽屉。它与ICS及以上版本的Android完美搭配。但是,在旧版本中,它会因此错误而崩溃:
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
我尝试将这个特定的xml文件从Android sdk复制到我自己的项目中,但这没有帮助。
这是xml文件(删节):
<?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>
代码:
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
mDrawerLayout.openDrawer(mDrawerList);
完整的堆栈跟踪:
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
答案 0 :(得分:8)
导航抽屉的官方Google示例,将此TextView作为drawer_list_item.xml的一部分
<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"/>
但是,使用这三个属性值,应用程序在pre-ICS android操作系统上失败。我通过提供自己的自定义值(与这些不同的任何东西)进行验证,并且它在每个版本上都像魔术一样。
答案 1 :(得分:8)
官方Navigation drawer example的最低API级别为14.如果此最小值设置为ICS版本(例如11),则会导致强制关闭,因为方法setHomeButton仅可用于API-14。
getActionBar().setHomeButtonEnabled(true);
当评论出前一个语句时,这会导致膨胀异常,这是因为使用了API-14中也添加的adroid维度。
<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"/>
对于我支持API-11 +的应用程序,我已解决了以下问题。
1)在drawer_list_item.xml中,参考自定义属性
<?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)在values / attrs.xml中定义自定义属性
<?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)在values-11 / styles.xml
中<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)在values-v14 / styles.xml
中 <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>
如果您想支持旧版/其他版本,则需要为该特定版本添加styles.xml。