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我的应用程序有两个 android 主题。我想使用 attrs.xml 创建一个新的自定义颜色值引用，但这会使应用程序不断崩溃。

虽然我已经看到其他答案说它与他们一起工作正常： 如何在 android 主题声明中添加自定义项目？

这是我的 style.xml

    <resources>

    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>

        <item name="newValue">@color/black</item>
</style>


    <style name="Dark.AppTheme" parent="AppTheme">
        <item name="colorPrimary">#000000</item>
        <item name="colorPrimaryDark">#000000</item>
        <item name="colorAccent">@color/colorAccent</item>

        <item name="newValue">@color/white</item>

    </style>
</resources>

attrs.xml

    <?xml version="1.0" encoding="utf-8"?>
<resources>
    <attr name="newValue" format="reference|color" />
</resources>

颜色.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#2196F3</color>
    <color name="colorPrimaryDark">#3F51B5</color>
    <color name="colorAccent">#FF9800</color>
    <color name="white">#FFFFFF</color>
    <color name="black">#000000</color>
</resources>

看法

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="?newValue">
</RelativeLayout>

日志猫

java.lang.RuntimeException: Unable to create service com.moaness.servicetest.mainService: android.view.InflateException: Binary XML file line #9: Binary XML file line #9: Error inflating class <unknown>
        at android.app.ActivityThread.handleCreateService(ActivityThread.java:3453)
        at android.app.ActivityThread.-wrap4(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1712)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:176)
        at android.app.ActivityThread.main(ActivityThread.java:6701)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:249)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)
     Caused by: android.view.InflateException: Binary XML file line #9: Binary XML file line #9: Error inflating class <unknown>
     Caused by: android.view.InflateException: Binary XML file line #9: Error inflating class <unknown>
     Caused by: java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Constructor.newInstance0(Native Method)

.
.
.

     Caused by: java.lang.UnsupportedOperationException: Failed to resolve attribute at index 13: TypedValue{t=0x2/d=0x7f030140 a=-1}
        at android.content.res.TypedArray.getDrawableForDensity(TypedArray.java:946)
        at android.content.res.TypedArray.getDrawable(TypedArray.java:930)
        at android.view.View.<init>(View.java:4738)
        at android.view.ViewGroup.<init>(ViewGroup.java:597)
        at android.widget.RelativeLayout.<init>(RelativeLayout.java:248)
        at android.widget.RelativeLayout.<init>(RelativeLayout.java:244)
        at android.widget.RelativeLayout.<init>(RelativeLayout.java:240)

这段代码有什么问题？

4

1 回答 1

0

根本问题是这样的：

UnsupportedOperationException: Failed to resolve attribute...

每当您在布局膨胀期间看到这一点时，这意味着布局中引用的某些属性（或其中的某些可绘制、颜色等）在用于实例化s的主题Context中不可用。在这种情况下，默认情况下，即a和s 没有附加主题。LayoutInflaterViewContextServiceService

为了解决这个问题，只需将Servicea包装为所需主题ContextThemeWrapper的适当值，然后从中获取。例如：R.styleLayoutInflater

ContextThemeWrapper ctw = new ContextThemeWrapper(MyService.this, R.style.AppTheme);
LayoutInflater inflater = LayoutInflater.from(ctw);
View layout = inflater.inflate(R.layout.service_layout, null);

另一种可能的选择是在您Service自己上手动设置一个主题，这将排除ContextThemeWrapper. 例如：

@Override
public void onCreate() {
    super.onCreate();
    setTheme(R.style.AppTheme);
}

然后，您可以LayoutInflater直接从Service; 例如，

LayoutInflater inflater = LayoutInflater.from(MyService.this);
View layout = inflater.inflate(R.layout.service_layout, null);

理论上，这应该适用于任何地方，但由于 aService通常没有主题或管理​​ UI，我不确定它是否可以在每个环境中依赖，考虑到自定义Service子类、制造商和自定义 ROM 修改等.

事实上，我会说这ContextThemeWrapper是更可靠的解决方案。

于 2019-08-23T09:18:44.460 回答