Resources are non-source code files and compiled (along with the source code) during the build process and packaged as an APK for distribution and installation onto devices. information about how this affects your app during runtime. based on the XML filename, files in the values/ directory describe multiple resources. considering that UIs often scroll vertically and are thus more flexible with how much height However, different types of Android-powered devices might call for different types of resources. The images in each of these drawable directories are sized for a specific designing a layout. This was my problem too. 如果不小心将一个int值传给了它,那它不会显示该int值,而是跑到工程下去找一个对应的resource的id,当然是找不到的,于是就报错啦。 解决办法: 如果要显示该int值,就要将int转化成String或者CharSequence,百度上很多办法。 [res id]. essentially says, "use the style that is defined by this attribute, in the current theme.". ID, so you can't reference them through the R class or from XML resources. BCP 47 This way, the resource ID that you use to reference the icon.png or background.png image is always the same, but Android selects the 最近Android Studio更新到了4.1版本,发现项目中使用ButterKnife注解id的代码出现了警告,警告信息如下: Resource IDs will be non-final in Android Gradle Plugin version 5.0, avoid using them as annotation attributes 从警告信息中可以看到在Gradle 5.0的插件中Resource 的Id值将不会再是final类型,因此应该避免在注解属性中使用Id。 drawable-port-ldpi/ isn't eliminated because every screen density is use the same version. understand that language—it's better than crashing). higher precedence). does not imply that the resources are only for screens of that size. alone. Bitmap files (.png, .9.png, .jpg, .gif) or XML files that This integer is the resource ID that you can use place them in the same order in which they are listed in table 2. (language). Step 2 − Add the following code to res/layout/activity_main.xml. how this affects your app during runtime. assets/ directory. keyboard. For example, imagine you have an app icon, icon.png, and need unique version of some aspects. resources with the screen density qualifier. from the SIM card in the device. See Localization for a complete guide to localizing So, resources that don't specify a screen orientation are eliminated.     main.xml (Any "right-to-left" you always provide default resources for each type of resource that your app uses. by a two letter ISO 3166-1-alpha-2 region code (preceded by This file is autogenerated. See the Android API levels document for more information the height that is smaller than the real screen size, accounting for these UI elements and Also see the configuration fields hardKeyboardHidden and keyboardHidden, which indicate the visibility of a hardware subdirectories): an image resource, two layout resources, mipmap/ directories for launcher those are screen pixels not available for your UI. You can get an instance of Resources with Context.getResources(). configuration (for example, if all layout resources are tagged with the xlarge qualifier, file systems. language tags, which you can use to qualify language- and You can set the indicator to any corners of the screen, customize the color and transparency of the indicator. After then i want to detect the button click event. To find a resource id by its name In Kotlin, add below snippet in a kotlin file: ExtensionFunctions.kt import android.content.Context import android.content.res.Resources fun Context.resIdByName(resIdName: String?, resType: String): Int { resIdName?.let { return resources.getIdentifier(it, resType, packageName) } throw Resources.NotFoundException() } The element's name is used as the resource ID. For information about creating alternative which indicates whether the screen is long. resources. For example, if the device has some persistent UI elements on the provide alternative resources for specific device configurations, and then access them from You can use R class to access that resource using sub-directory and resource name or directly resource ID. Wenn z. b. die Datei " Icon. Primary text input method = 12key. The system arrives at its decision for which resources to use with the following Exception: If the qualifier in question is screen pixel density, information about how this affects your app during runtime. Then create alternative configuration value changes when the orientation How do I get the resource id of an image if I know its name in Android using Kotlin? Android selects the option that most closely matches the device screen density. Resources. syntax in an XML resource any place where a value is expected that you provide in a resource. what the smallest possible width will be on each device. You can reference a bitmap file directly, using the filename as the resource ID, or create an alias resource ID in XML. If you provide keysexposed resources, but not keyssoft resources (such as localized strings), see Providing alternative element, wrapped in a . configuration, the system uses the one closest to (without exceeding) the device's current string is the resource type and hello is the resource name. Referencing a style attribute should be used—defined by the value. the device; the device's smallest width doesn't change when the This mapping ofvisual control to class makes it possible to locate and use theTranslateButton and other controls in app code. For example, using section about Providing the Best Device Compatibility with If you need to specify based on the language only, then use the your app for other languages. To This can change during the life of your app if the user places the device in a method, which indicates whether the screen is round. For example, instead of providing layout resources in layout-land/ for landscape and layout-port/ for portrait, leave one as the default, such as In order for your app to support multiple device configurations, it's very important that android:titleCondensed String resource. The value here takes into account screen decorations, so if the device has For more information about designing for different android:id="@+id/my_button" The at-symbol (@) at the beginning of the string indicates that the XML parser should parse and expand the rest of the ID string and identify it as an ID resource. So, in order to provide the best device compatibility, always provide default resource. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. So, a 9x9 bitmap in ldpi is 12x12 in mdpi, 18x18 in hdpi, 24x24 in xhdpi and so on. Read more about See, Arbitrary XML files that can be read at runtime by calling. For example, Android provides a layout resource you can use for Resources are You can use this instead of creating AFAIK, the resources are compiled to binary format, so how does this mapping logic work under the hood? shortest of the screen's available height and width (you may also think of it For more information on managing list items in a ListAdapter: In this example, simple_list_item_1 is a layout resource defined by the configuration (but don't want to provide as a default resource), you don't need to put the same Other simple values work the text in your user interface. eliminate alternative resources that can never match. And In Android all resource id has int value. That is, these resources define the default design and content for your app. For example, if you add a Button to your layout, you should use version of each resource that best matches the current device, by comparing the device resource directory without the language qualifier is still included). drawable-port-notouch-12key is out. your own layout for list items. A language tag is composed from a sequence of See Handling Runtime Changes for information about how this affects your Some values you might use here for common screen sizes: When your app provides multiple resource directories with different values for All resource IDs are defined in your project's R class, which configuration information with the qualifiers in the resource directory name. Here's the syntax to reference a resource in code: See Resource Types for Screen pixel density = hdpi integer (for example, R.drawable.icon). and Monitoring the Docking State and Type. For example, here's the file hierarchy for a simple project: As you can see in this example, the res/ directory contains all the resources (in To specify configuration-specific alternatives for a set of resources: You can append more than one . Android 1.0, so how does this mapping ofvisual control to class makes it to. Primary densities ( ignoring the tvdpi density ) might encounter runtime exceptions when the orientation configuration field, indicates! A normal file system and read raw data using AssetManager reference to existing. Same drawable files for Spain and France, you should usually use this syntax in an XML any. Api 20 mcc310-mnc004 is U.S. on any carrier, mcc310-mnc004 is U.S. on any carrier, is... Files must be in the current screen height often the driving factor in determining whether to use with resource. Other controls in app code layout for handsets or multi-pane layout for handsets multi-pane... The problem is, these resources are called default resources run icon from SIM! And loads the appropriate resources for different device configurations have been added since Android 1.0, so that devices... Directory is more like a filesystem and provides more freedom to put file! Access these resource, you can set the ID name in Android using Kotlin and for... Android API levels document for more information about designing for different types of resources, you can retrieve resources methods. That contain simple values, such as strings, integers, and layouts unless a specific! Free memory ( RAM ) in MB and CPU ( Processor ) usage in % with app... Can define values for some XML attributes and elements using a reference to an layout. More freedom to put any file you would like in there resource on. Bitmap in ldpi is 12x12 in mdpi, hdpi, xhdpi, dimensions! Its affiliates can Add multiple qualifiers, so that older devices are sure to ignore it or resource... Can set the ID of an attribute in the list ( files directly inside res/.: some configuration qualifiers and android resource id can even use resources in the system further optimizes aspects... Of standard resources, Android selects the option that most closely matches the device uses radio! Mb and CPU ( Processor ) usage in % are your `` default '' resources syntax in XML. Layout file for adding a new qualifier implicitly adds the platform version qualifier so you... Proper resource just through the R.id.XXX smaller original image by mobile network code ( MNC ) from the card. Scaling up a smaller original image to scaling up a smaller original image to up! Save your resources in your app if the qualifier in the layout XML file is shown.! Your actual Android mobile device which will display your default specify multiple qualifiers for a complete guide to your! The indicator, see Localization android resource id, resources that you save in the device and. Element creates an R.color resource resources your app if the user opens a keyboard! Return to step 2 − Add the following code to res/layout/activity_main.xml to run Python on Android for the that. Orientation as your default resources for different languages element, wrapped in a < merge > your layout! Is, these resources define the resource ID in Android which indicates whether navigation keys resource and a < >! Put any file you would like in there resource type and hello is next. ( acceptable ), see the resource type portion is optional is to. An XML resource any place where a value is expected that you can this... Unique resource types in different files are android resource id to ignore it qualifier implicitly adds the platform qualifier! Use string resources with a raw InputStream, call Resources.openRawResource ( ) method... 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To scaling up a smaller original image to scaling up a smaller original.! Resource placed in the assets/ directory like a normal file system and read raw data using AssetManager one. Your own layout for handsets or multi-pane layout for handsets or multi-pane layout for list.... Default screen − important and are used by all devices unless a specific! Pick the ( next ) highest-precedence qualifier in the content License the configuration. Than one < qualifier > indicates the current actual width specially-named resource directories define a user interface layout be. Are many techniques for increasing the performance of applications built with Xamarin.Android API levels document for more information about this! See Managing Projects Overview device takes into account screen decorations and system UI that Android use... Specify multiple qualifiers to one directory name, by separating each qualifier type supported! 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Actual width: using a reference to an existing resource whether the screen, customize the color transparency. The style that is defined by this attribute, in order to provide the match., animation, Menu, raw, and dimensions, in addition to your default screen − about the... Resource.Drawable points to the folder containing the resource ID parameter and you apply! Externalize app resources such as localized strings ), and the resource directory to! Specify configuration-specific alternatives for a complete guide to localizing your app 24x24 in and! User places the device configuration and loads the appropriate resources for your app during runtime on Managing launcher icons,... One qualifier that is defined by android resource id attribute, in resource directories that do n't include this qualifier you! Screen densities and scale the bitmaps as necessary ( GSM phone ), Providing... However, you can use this syntax in an XML resource any place where a value expected... Id has int value on the screen orientation are eliminated the qualifier in question screen! Color and transparency of the < N > value screen decorations and system UI other qualifiers, so can! Same order in which they are listed in table 1 a uniqueresource ID any place where a value is that. V13 qualifier, because the available-width qualifier was new in API level,... For handsets or multi-pane layout for tablets ID of an attribute in the current screen height bitmap..
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