我的应用有两个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。

尽管我已经看到其他答案,但说这很适合他们:
How to add custom item in android Theme declaration?

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>


colors.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>


视图

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


Logcat

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)


此代码有什么问题?

最佳答案

根本问题是这样的:

UnsupportedOperationException: Failed to resolve attribute...


每当您看到布局膨胀期间,这意味着在布局中引用的某些属性(或其中的一些可绘制,颜色等)在Context用于实例化的LayoutInflater主题上不可用。 View s。在这种情况下,ContextService,默认情况下,Service没有附加主题。

要解决此问题,只需将Service包裹在ContextThemeWrapper中,并为所需主题使用适当的R.style值,然后从中获取LayoutInflater。例如:

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




另一个可能的选择是自己在Service上手动设置主题,这将排除对ContextThemeWrapper的需要。例如:

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


然后,您可以直接从LayoutInflater获取它们。例如。,

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


从理论上讲,这应该在任何地方都有效,但是由于Service通常没有主题或管理​​UI,因此我不确定在每个环境中都可以依赖它,考虑到自定义Service子类,制造商和自定义ROM修改等。

实际上,我想说Service是更可靠的解决方案。

关于java - 无法使用自定义项目颜色设置服务布局样式,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/57622360/

10-14 12:36