declare-styleable | 易学教程

Android: <declare-styleable> method attributes

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问题 How does one accept methods as values, in attributes? Like in the onClick attribute for a View: <Button android:onClick="onClickMethod"/> How to define custom attributes that accept methods? I know we use <declare-styleable> in resources, but how do we make it accept methods? 回答1: Android uses reflection to find the name of the method and invoke it. You can see an example in the source starting at line 4209 https://github.com/android/platform_frameworks_base/blob/master/core%2Fjava%2Fandroid

Android: <declare-styleable> method attributes

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Changing theme of an activity without recreating activity

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问题 I have an activity . In that on a button click I want to change the theme but everywhere I found that theme can be set only once and that too before setContentView. Restarting an activity is not an option for me. Maybe using attrs has to do something with this problem. But I have no idea how to use it. Please Help!! Thanks in advance!! 回答1: No that is not possible, from the relevant documentation: public void setTheme (int resid) Set the base theme for this context. Note that this should be

error <declare-styleable> MenuView, unable to find attribute android:preserveIconSpacing

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问题 I had update my eclipse Version: 4.2.2 and android SDK with API 23. When i created an app then get an error like this. [2015-10-12 17:03:05 - appcompat_v7] ERROR: In MenuView, unable to find attribute android:preserveIconSpacing and warning [2015-10-12 16:50:14 - appcompat_v7] WARNING: unable to write jarlist cache file D:\lolipop Workspace\appcompat_v7\bin\jarlist.cache Syntax error, insert "}" to complete ClassBody R.java /appcompat_v7/gen/android/support/v7/appcompat line 3065 Java Problem

Declaring styleable attributes in Android

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问题 There's precious little documentation about the declare-styleable tag by which we can declare custom styles for components. I did find this list of valid values for the format attribute of the attr tag. While that's nice as far as it goes, it doesn't explain how to use some of those values. Browsing attr.xml (the Android source for the standard attributes), I discovered that you can do things like:  <attr name="textColorPrimary" format="reference|color"

ERROR: In <declare-styleable> MenuView, unable to find attribute android:preserveIconSpacing

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问题 I had created an app and when tried to run,get an error like this. ERROR: In <declare-styleable> MenuView, unable to find attribute android:preserveIconSpacing Problems and at end of R.java please help me to fix this issue 回答1: I had the same problem in Eclipse, and fixed it by changing the API level by... Right Clicking on the project Open PROPERTIES > ANDROID Changed the API level down to the one I had been using up to now. I think I was having the problem because I had just switched from

NumberFormatException when using styleable attrs

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问题 I created a custom view for Android which renders two inner views to store a key and a value in two columns. The class looks like this: public class KeyValueRow extends RelativeLayout { protected TextView mLabelTextView; protected TextView mValueTextView; public KeyValueRow(final Context context) { super(context); init(context, null, 0); } public KeyValueRow(final Context context, final AttributeSet attrs) { super(context, attrs); init(context, attrs, 0); } public KeyValueRow(final Context

Can someone explain me declare-styleable XML tag in this example and the theory behind its use?

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问题 I'm reading Beginning Android 4 Development and in chapter 5 it talks about Gallery and ImageVievs and introduces the declare-styleable XML tag without explaining its purpose.. I tried to find some info also on the reference, without luck.. For example we have the following: res/values/attrs.xml <?xml version=”1.0” encoding=”utf-8”?> <resources> <declare-styleable name=”Gallery1”> <attr name=”android:galleryItemBackground” /> </declare-styleable> </resources> example.java public class

Android library project uses declare-styleable — how to compile?

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I have a custom preferences control that I have defined a few attributes for in values/attrs.xml. Just to focus the conversation, here is an example of attributes that could be found in values/attrs.xml: <?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="MyCustomView"> <attr name="android:text"/> <attr name="android:textColor"/> <attr name="extraInformation" format="string" /> </declare-styleable> </resources> To use the attributes, you use an xmlns tag where you want to use it, and it looks something like this: xmlns:custom="http://schemas.android.com/apk/res/com

Difference between declare-styleable and style

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I've begun playing around with styles and such in my android applications, and I have gotten everything working so far. I quite understood the 'style' section of the guide . But, looking around, as in this thread , I can't really figure out the difference between the two ( declare-stylable and style ). From my understanding declare-styleable takes the attribute specified in it and specifies it as styleable, and then from the code one changes it as he wants. But if this is what it really does, wouldn't it be simpler to just define the attribute in the layout? Or declare a style specifying it?