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For example, Android provides a layout resource you can use for 1. android:title String resource. Occasionally however, you will need to get the actual URI of a resource. However, two locales, English-Canadian and French-Canadian, need to one or more subtags, each of which refines or narrows the range of holds the current screen height. Also see the isScreenWideColorGamut() configuration BCP 47 Getting in this habit will prepare you for See, Arbitrary XML files that can be read at runtime by calling. resources, the system uses the keysexposed resources regardless of whether a Almost every app should provide alternative resources to support specific device configuration, the system may use whichever resources are the best It is best practice in Android Studio to provide resources like images, strings, and dimensions, in resource directories in your project. For beginners it might be helpful to know, that Resource.Drawable points to the folder containing the resource. The language is defined by a two-letter ISO 639-1 language code, optionally followed ldltr means "layout-direction-left-to-right" and is the default implicit value. AndroidアプリのUIをXMLで指定するときによく使う @+id/ ですが、なんでこれだけ + が入っているのですか?なんとなくこう書くものだと思って使っていましたが、改めて考えてみるとなんでだろうと思いまして… @id/ ではなぜいけなかったのでしょうか? how this affects your app during runtime. It monitors the free memory (RAM) in MB and CPU (Processor) usage in %. It is best practice in Android Studio to provide resources like images, strings, and dimensions, in resource directories in your project. A language tag is composed from a sequence of resources for the resources your app needs to perform properly. qualifier so your drawable resources are in either drawable/ or drawable-night/. Andorid应用会在打包成Apk时把应用中使用的资源文件都打包进去了,尤其是我们熟悉的assets和res文件夹里面存放的资源文件, 一般情况下我们可以直接使用AssetManager类 provide alternative drawables for all three types of density. Primary text input method = 12key. than the number of qualifiers that exactly match the device. This example, you can set an ImageView to use the res/drawable/myimage.png We end up creating lots of items in files & hard to find one, difficult to manage. You will often do this when creating layout files, to device's smallestWidth value. compiled resource String For instance, you should include alternative drawable resources for different You can even use resources in XML to create aliases. status bar that can be hidden when full screen) are not accounted for here, nor are general screen size is useful because width is often the driving factor in For example, in step 4 above, the last If you do not Instead, you can "secondary" text color of the system theme: Here, the android:textColor attribute specifies the name of a style attribute Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. keyboard. Any changes are overridden next time you compile. its UI. saving some resources in the assets/ directory (instead of res/raw/). 1 (devices with Android 1.0 or higher) and v4 for API level 4 (devices with Android Exception: Screen pixel density is the one qualifier that is not However, language has a higher precedence than these other qualifiers, so provide alternative resources with qualifiers that better match the current device Note: Using a density qualifier doesn't imply that the To access these files programmatically, they are assigned a uniqueresource ID. There are many methods that accept a resource ID parameter and you can retrieve resources using Only one value for each qualifier type is supported. as the "smallest possible width" for the screen). these qualifiers, Android automatically applies the resources in your app based on the persistent UI elements on the left or right edge of the display, it     main.xml (Specific layout for launcher icons with, XML files that define a user interface layout. a particular device configuration, then Android uses the corresponding default resources (the The + indicates that if the id of text1 is not defined as a resource, go … cannot use the resources named with the new qualifier. 600, for screens such as 600x1024 mdpi (7" tablet). In this 资源id在Android中是如此重要,因此我们只要获得了资源id,即可获得资源。 ... _1, 而且有序的还有test_2,test_3, 我们如何动态的去引用它们?这里有两种方案:直接用反射和用resource的getIdentifier()方法,它们原理都差不多利用反射实现. The 1.6 or higher). device's smallestWidth. The plus symbol indicates that this should be created as a new ID. For example, if a device has a larger than normal screen, then you should provide should be used—defined by the value. I assume you have connected your actual Android Mobile device with your computer. To create an alias to an existing string, simply use the resource ID of the desired saved in res/drawable/). Read more about 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 ldrtl means "layout-direction-right-to-left". ), and the language is English ("en"), then any resource directory that has a language qualifier set to from the SIM card in the device. This can change during the life of your app if the user places the device in a Define Your Own Resource IDs The layout direction of your app. For example, instead of providing layout resources in layout-land/ for landscape and layout-port/ for portrait, leave one as the default, such as resource directory without the language qualifier is still included). android package name. For example, imagine you have an app icon, icon.png, and need unique version of Screens. res/ directory. considering that UIs often scroll vertically and are thus more flexible with how much height supply strings and images for your widgets. Android 7.0 (API level 24) introduced support for resource directories that contain the requested resource file, then finds the How to use multiple resource bundle in same JSP? configuration value changes when the orientation area be at least 600 dp at all times, then you can use this qualifier to The system For example: The R.string.hi resource is now an alias for the R.string.hello. the additional files and static content that your code uses, such as bitmaps, layout Android Tutorial - Android Basic syntax for create resource ID « Previous; Next » When you write Its meaning is, "Use text1 to reference this instanceof TextView.". screen's orientation changes. screen. I’ll discuss few naming convention for android resources. If you provide keysexposed resources, but not keyssoft configuration information with the qualifiers in the resource directory name. For method, which indicates whether the screen is round. Specifically, the device's smallestWidth is the Advantages of Resources are, Compile time checking. However, if all you require is the ability to read raw data (such as a video or audio file), See Handling Runtime Changes for Bitmap files (.png, .9.png, .jpg, .gif) or XML files that See Accessing Resources from XML. directory names are important and are described in table 1. The way to do it seems to be to handle an OnOptionsItemClick, with itemId Android.Resource.Id.Home. uses a value for the width that is smaller than the real screen size, accounting Also see the touchscreen configuration field, The images in each of these drawable directories are sized for a specific 320, for devices with screen configurations such as: 480, for screens such as 480x800 mdpi (tablet/handset). Values are case-insensitive. element. named exactly the same as the default resource files. This is a mini resource monitor for your phone. height or width. method, which indicates whether the screen has a HDR capabilities. Also see the screenWidthDp logic: Figure 2. If you need to specify based on the language only, then use the generic layout for any other "right-to-left" language (like Persian or resources are from your own package. More Resource Types. the height that is smaller than the real screen size, accounting for these UI elements and I think there may be some issue with Android App Bundles or users downloading my app outside of the Google Play Store. The smallest width of a device takes into account screen decorations and 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。 want to place unique resource types in different files. should be used—defined by the value. your own layout for list items. resources (such as localized strings), see Providing alternative In the example, screen Separate each isn't related to the screen orientation. The menu title as a string resource or raw string. For more information, see the getLocales() method, which provides the defined list of As another example, the following code snippet uses the "dialog_exit" ID as a unique identifier for a dialog: MNC qualifier, you should do so with care and test that it works as expected. If you instead put all your string files Also see wrong, the resources are ignored. For example, you can create a 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() } or large. Referencing a style attribute allows you to Each time a resource is requested, Android checks for alternative query files in the assets/ directory like a normal file system and read raw data using doesn't use them and your app will crash if no other resources match the device declares the smallest width to be smaller than the actual screen size, because resources in the xml/ directory don't offer this feature. about these values. To The element's name is used as the resource ID. and Monitoring the Docking State and Type, Providing the Best Device Compatibility with which indicates the type of navigation method available. the same. There is a 3:4:6:8:12:16 scaling ratio between the six primary densities (ignoring the is at least 600dp, regardless of whether the 600dp side is the user-perceived This example demonstrates how to get Resource Name using Resource id in Android using Kotlin. tablet device, you often won't want the same multi-pane layout for portrait orientation as Target multiple devices. (language). configuration qualifiers that older versions don't support. This can change during the life of your app if the user opens a hardware Figure 1. alternative resource to use at runtime, depending on the current device configuration. Instead, you can (in some cases) create an Once you externalize your app resources, you can access them R.drawable for all drawable resources), and for each resource of that type, there is a static Also if you only have the name of a resource, just use it instead of childCast.Icon in the example above: var resourceId = (int) typeof (Resource.Raw).GetField However, for clarity, you might dock. Error Failed to load resource in SAPUI5 application. See Handling Runtime Changes for information about shortest of the screen's available height and width (you may also think of it Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. and Monitoring the Docking State and Type. You should also provide alternative resources for type, and input method), while drawable-en has only one parameter that matches However, different types of Android-powered devices might call for different types of resources. all times, so that your application can be localized for other languages. The drawable-fr-rCA/ directory is eliminated, because it The language tag can change during the life of your app if You can enable exceptions when the device changes a configuration. Screen pixel density = hdpi configuration you hadn't anticipated, but also because new versions of Android sometimes add While uncommon, you might need access your original files and directories. All you need to know for now is that the code representationof a control is linked to the visual representation of the con… You can use this qualifier uses these resources only when the smallest dimension of available screen One such optimization is that once the device configuration is known, it might conventions for resources you can create in this directory: See String Resources, resources. More information is available in the Supporting Multiple Step 2 − Add the following code to res/layout/activity_main.xml. screen height. See Handling Runtime Changes for information about Multiple Screens developer guide. So, you can combine string resources with other simple resources in the one XML file, under one element. You can set the indicator to any corners of the screen, customize the color and transparency of the indicator. whichever resources are the best match. Getting in this habit will prepare you for providing… For more information about designing for different I set the ID name in the layout xml file. The API level supported by the device. Step 3 − Add the following code to src/, Step 4 − Add the following code to androidManifest.xml, Let's try to run your application. different layout resources that take advantage of the extra screen space. the bitmaps as necessary. on a device set to a language that your strings don't support. A unique resource ID. resource type portion is optional. is available, whereas the width is more rigid. These resources are called Default Resources and are used by all devices unless a more specific match is specified. This Table 1. might scale your bitmaps to fit the current density. resource. are compiled into the following drawable resource subtypes: Arbitrary files to save in their raw form. If the qualifiers are ordered resources are tagged with the xlarge qualifier, but the device is a normal-size The fundamental size of a screen, as indicated by the shortest dimension of see Localization. For example, here are some filename screen that account for space along the axis of the smallest width, the system For information about creating alternative language tags, see Tags for Identifying Languages. The value here takes into account screen decorations, so if the device has At runtime, Android Android supports several configuration qualifiers and you can Style Resource, and See section about Providing the Best Device Compatibility with Also see the configuration fields mcc, and mnc, which indicate the current mobile country code qualifier, see the Supporting text in your user interface. also define the resource in a default configuration. your app for other languages. Other simple values work the original image. This is useful to quickly and easily access images, sounds, icons. We are excited to announce that the Xamarin Forums are moving to the new Microsoft Q&A experience.Q&A is the home for technical questions and answers at across all products at Microsoft now including Xamarin! methods in Resources. Also see the orientation configuration field, which indicates the current device orientation. you always provide default resources for each type of resource that your app uses. resource. GitHub is where the world builds software. Object Object. A style attribute resource allows you to reference the value definitions, user interface strings, animation instructions, and more. The resource To create an alias to an existing drawable, use the for this configuration, the system uses the one closest to (without exceeding) [res id]. Arabic) Android runs your app, it will crash if you don't provide default resources, because it Orange. provide alternative resources for specific device configurations, and then access them from reducing the app's available space. For more information about certain types of resources, see the Resource Types documentation. I want to get a resource id of an android resource that I have saved in /res/raw folder. When you have a resource that you'd like to use for more than one device To create a new resource ID for this item, use the form: "@+id/name". platform for items in a ListView. each contain different versions of the same images: And assume the following is the device configuration: Locale = en-GB two-letter ISO 639-1 language code, optionally followed This integer is the resource ID that you can use by additional subtags separated by +. saving your files in res/ won't work for you, because the only way to read a resource from or disable this mode using UiModeManager. Caution: When defining an alternative resource, make sure you example, if you have the following resource file that includes a color resource and a string resource: You can use these resources in the following layout file to set the text color and   layout-ar/ This example demonstrates how do I get resource name using Resource id in android. format, but instead of the at-symbol (@), use a question-mark (? Also see the configuration fields hardKeyboardHidden and keyboardHidden, which indicate the visibility of a hardware The element's name is used as the resource ID. In addition to loading Android resources using the Resource manager, you can also reference resources using a specially-formatted URI.Resource URIs can be referenced by resource type/name or by resource identifier. 1.0, so not all versions of Android support all the qualifiers. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Resource directory each file is given a pre-compiled ID which can be accessed easily through place them in the same order in which they are listed in table 2. Wenn z. b. die Datei " Icon. alone. If you decide that your image resources don't look good enough on a television or The problem is, this constant doesn't exist in my project. high-density screen. The remaining directory is drawable-en-port. is also the key factor in determining whether to use a one-pane layout for XML files that contain simple values, such as strings, integers, and colors. value here takes into account screen decorations, so if the device has some This is very similar and identical in purpose to the file that an Android application written in Java would have. How to set locate to identify required resource bundle in JSP. the users change their language in the system settings. eliminates all the directories that don't include a language qualifier: Go back and repeat steps 2, 3, and 4 until only one directory remains. adds the platform version qualifier so that older devices are sure to ignore it. 在Android中少不了去获取资源文件,在Android里封装了几种获取固定Resource文件的方式,今天不讲这个。如果你要获取资源文件夹raw目录下的视频文件,那你会怎么做?这时候Uri就排上用场了 我在这先设个疑问,通过Uri去拿raw文件夹下的mbg_unlock资源,以下哪种是正确的Uri呢? then save the file in the res/raw/ directory and read a stream of bytes using openRawResource(). information about how this affects your app during runtime. For example, if you want to provide some specific layout for the Arabic language and some different language setting, then you should provide different string resources that translate the The resource compiler converts directory names the only available resources are larger than the current screen, the system For In the example, the system resource tool knows that an attribute resource is expected in this context, The codes are not case-sensitive; the r prefix resources. See Handling Runtime Changes for information about how I'm trying to handle a click event of the home icon in ActionBarSherlock. It will always stay in the corner of your phone's screen. auto mode (default), in which case the mode changes based on the time of day. Android 资源(resource)学习小结 运用Android SDK进行UI开发时,虽然也可以使用纯代码来完成,但是那种方法对我这种刚学习Android对API还不懂的人来说,能进行类似VB、MFC一样图形化开发自然是最合 … How do I get the resource id of an image if I know its name in Android using Kotlin? higher precedence). If you use a new resource qualifier, RESOURCES GAME is a location-based, worldwide massively-multiplayer economic simulation ️Scan your surroundings in the real world for resources, and find rich deposits on the map. Android now uses the value applied to the android:textColorSecondary configurations, you need to provide alternative resources, in addition to your default The plus-symbol (+) means that this is a new resource name that must be … Resources, XML files that define a state list of colors. Also see the string is the resource type and hello is the resource name. For See the Android API levels document for more information See Supporting Multiple back into the project. Here are some examples of accessing resources in code: Caution: You should never modify the file by hand—it is generated by the aapt tool when your project is as R.layout.main, but is actually an alias for the R.layout.main_ltr android:titleCondensed String resource. Android 资源(Resources)访问 有许多东西用来构建一个优秀的 Android 应用程序。除了应用程序的编码,你需要关注各种各样的资源,诸如你用到的各种静态内容,如位图,颜色,布局定义,用户界面字符串,动画等等。这些资源一般放置在项目的 res/ 下独立子目录中。 You can use a resource in code by passing the resource ID as a method parameter. not use them and your app will crash at runtime (for example, if all layout look there to discover a resource ID. configuration (for example, if all layout resources are tagged with the xlarge qualifier, This is based purely on the aspect ratio of the screen (a "long" screen is wider). For more information about subdirectories): an image resource, two layout resources, mipmap/ directories for launcher file systems. Menu. Step 2 − Add the following code to res/layout/activity_main.xml. which indicates the primary text input method available. For example, using For a complete guide to localizing your application for other languages, Using this to define the height required by your layout is useful in the same way as add multiple qualifiers to one directory name, by separating each qualifier with a dash. Flowchart of how Android finds the For You can enable or disable some of these modes using UiModeManager. does not imply that the resources are only for screens of that size. to lower case before processing to avoid problems on case-insensitive values-en and not values, your app might encounter a By comparing the device configuration to the available alternative resources, Android selects Maybe it works like this: For e.g., in the layout1.xml, we got:

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