Question

我有一个可绘制的背景（称为card_background_selector_light），基本上看起来像这样：

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/card_state_pressed_light" android:state_pressed="true" />
    <item android:drawable="@drawable/card_background_light" />
</selector>

我有一个名为card_background_selector_dark的几乎相同的drawable。基于我现在想要展示的主题。

为此，我在attrs.xml中定义了一个属性：

<attr name="listItemBackground" format="reference"></attr>

并将其包含在我的两种风格中：

<style name="AppThemeDark" parent="android:Theme.Holo">
    <item name="listItemBackground">@drawable/card_background_selector_dark</item>
</style>

和

<style name="AppThemeLight" parent="android:Theme.Holo.Light">
    <item name="listItemBackground">@drawable/card_background_selector_light</item>
</style>

实际的LinearLayout现在看起来像这样：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:orientation="vertical"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:background="?attr/listItemBackground">

</LinearLayout>

在Android Studio预览中一切正常（我可以更改主题并相应地更改），但是一旦我尝试在实际设备上运行它，我会得到以下异常：

android.view.InflateException: Binary XML file line #11: Error inflating class <unknown>
    at android.view.LayoutInflater.createView(LayoutInflater.java:620)
    at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
    at android.view.LayoutInflater.onCreateView(LayoutInflater.java:669)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:694)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:469)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
    at org.jhi.android.germinatescan.adapter.ListRowAdapter.getView(ListRowAdapter.java:54)
    at android.widget.AbsListView.obtainView(AbsListView.java:2255)
    at android.widget.ListView.makeAndAddView(ListView.java:1790)
    at android.widget.ListView.fillDown(ListView.java:691)
    at android.widget.ListView.fillFromTop(ListView.java:752)
    at android.widget.ListView.layoutChildren(ListView.java:1630)
    at android.widget.AbsListView.onLayout(AbsListView.java:2087)
    at android.view.View.layout(View.java:14817)
    at android.view.ViewGroup.layout(ViewGroup.java:4631)
    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)
    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)
    at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
    at android.view.View.layout(View.java:14817)
    at android.view.ViewGroup.layout(ViewGroup.java:4631)
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
    at android.view.View.layout(View.java:14817)
    at android.view.ViewGroup.layout(ViewGroup.java:4631)
    at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:690)
    at android.view.View.layout(View.java:14817)
    at android.view.ViewGroup.layout(ViewGroup.java:4631)
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
    at android.view.View.layout(View.java:14817)
    at android.view.ViewGroup.layout(ViewGroup.java:4631)
    at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:374)
    at android.view.View.layout(View.java:14817)
    at android.view.ViewGroup.layout(ViewGroup.java:4631)
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
    at android.view.View.layout(View.java:14817)
    at android.view.ViewGroup.layout(ViewGroup.java:4631)
    at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1983)
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1740)
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
    at android.view.Choreographer.doCallbacks(Choreographer.java:574)
    at android.view.Choreographer.doFrame(Choreographer.java:544)
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:136)
    at android.app.ActivityThread.main(ActivityThread.java:5001)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
    at dalvik.system.NativeStart.main(Native Method)
 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:594)
     at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
     at android.view.LayoutInflater.onCreateView(LayoutInflater.java:669)
     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:694)
     at android.view.LayoutInflater.inflate(LayoutInflater.java:469)
     at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
     at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
     at org.jhi.android.germinatescan.adapter.ListRowAdapter.getView(ListRowAdapter.java:54)
     at android.widget.AbsListView.obtainView(AbsListView.java:2255)
     at android.widget.ListView.makeAndAddView(ListView.java:1790)
     at android.widget.ListView.fillDown(ListView.java:691)
     at android.widget.ListView.fillFromTop(ListView.java:752)
     at android.widget.ListView.layoutChildren(ListView.java:1630)
     at android.widget.AbsListView.onLayout(AbsListView.java:2087)
     at android.view.View.layout(View.java:14817)
     at android.view.ViewGroup.layout(ViewGroup.java:4631)
     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)
     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)
     at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
     at android.view.View.layout(View.java:14817)
     at android.view.ViewGroup.layout(ViewGroup.java:4631)
     at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
     at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
     at android.view.View.layout(View.java:14817)
     at android.view.ViewGroup.layout(ViewGroup.java:4631)
     at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:690)
     at android.view.View.layout(View.java:14817)
     at android.view.ViewGroup.layout(ViewGroup.java:4631)
     at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
     at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
     at android.view.View.layout(View.java:14817)
     at android.view.ViewGroup.layout(ViewGroup.java:4631)
     at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:374)
     at android.view.View.layout(View.java:14817)
     at android.view.ViewGroup.layout(ViewGroup.java:4631)
     at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
     at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
     at android.view.View.layout(View.java:14817)
     at android.view.ViewGroup.layout(ViewGroup.java:4631)
     at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1983)
     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1740)
     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)
     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600)
     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
     at android.view.Choreographer.doCallbacks(Choreographer.java:574)
     at android.view.Choreographer.doFrame(Choreographer.java:544)
     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
     at android.os.Handler.handleCallback(Handler.java:733)
     at android.os.Handler.dispatchMessage(Handler.java:95)
     at android.os.Looper.loop(Looper.java:136)
     at android.app.ActivityThread.main(ActivityThread.java:5001)
     at java.lang.reflect.Method.invokeNative(Native Method)
     at java.lang.reflect.Method.invoke(Method.java:515)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
     at dalvik.system.NativeStart.main(Native Method)
 Caused by: android.content.res.Resources$NotFoundException: Resource is not a Drawable (color or path): TypedValue{t=0x2/d=0x7f010002 a=-1}

我在这里阅读了很多其他主题（如this one和this one），基本上这样做的方式基本相同，但不知怎的，它对我不起作用。有什么想法吗？

更新

根据要求，这是我的活动的onCreate()方法：

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);

    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
    setTheme(preferences.getBoolean(PreferenceUtils.PREF_THEME, isDefaultThemeDark()) ? DARK_THEME : LIGHT_THEME);

    setContentView(R.layout.activity_main);

    INSTANCE = this;

    /* Make sure the default preferences are set */
    PreferenceUtils.setDefaults(this);

    databaseHandler = new DatabaseHandler(this);

    List<Row> items = databaseHandler.getAllItems();
    adapter = new ListRowAdapter(getApplicationContext(), android.R.layout.simple_list_item_1, items);

    if (items.size() > 0)
    {
        Row row = items.get(items.size() - 1);
        int col = row.getLastFilledColumn() + 1;

        if (col == getNrOfBarcodes())
        {
            currentColumn = 0;
        }
        else
        {
            currentColumn = col;
            currentListRow = row;
        }
    }

    listView = (ListView) findViewById(R.id.list_scanned_items);
    listView.setAdapter(adapter);

    hiddenInput = (EditText) findViewById(R.id.input);
    hiddenInput.setOnKeyListener(this);
    hiddenInput.requestFocus();

    /* Redirect every focus from the list view to the input text */
    listView.setOnFocusChangeListener(this);

    setCodeFormats();
}

Answer 1

您正在使用应用程序上下文来扩充列表项。尝试使用活动的上下文。

adapter = new ListRowAdapter(this, android.R.layout.simple_list_item_1, items);

Answer 2

如果我们不从活动类设置主题，则会发生此错误。一定要调用activity.setTheme（）; setContentView调用之前的方法。

LinearLayout背景基于主题

2 个答案: