Android studio multiple root tags

Multiple root tags in Android Studio

I am edit my fragment_main.xml in Android Studio, and I am getting this error:

Multiple Root Tags

The code block in question here is:

I am getting the errors in the brackets before EditText and before Button

Since in Android every xml file there must be only one root layout. Just add the EditText and Button inside the LinearLayout. Right code is shown below

ViewPager fragments disappear when change screen rotation

I’m working on android application that contains ViewPager with Fragments, like this: MainActivity(MainActivityFragment(screenSlideViewPager(Fragments))), which means: Activity contains Fragment .

Adding Fragments to a layout

I am trying to make my app more tablet-friendly, and so I’m trying to learn fragments. I want the typical two-pane layout, where the left side is the «navigation», and you click on one of the elements.

Waiting for Navigation Drawer to close before initializing Fragments with empty while-loop

According to the DrawerLayout documentation, «Avoid performing expensive operations such as layout during animation as it can cause stuttering». Thus, I’ve tried waiting for the drawer to close .

Listview crashes in portrait mode when clicked on items (using fragments)

I am using fragment layout in my app, this app contains a listview. Clicking on items will do some job. works fine when in landscape mode but getting crashed if items are clicked when in portait mode. .

newInstance() with custom Java Generic?

I am working on my first ‘Non-tutorial’ application to grow and strengthen my Android development skill sets. I’ve been using lots of Java Generics to enhance reusability and debugging, especially .

Accessing method from a Fragment in Button Click from MainActivity

Folks, I am trying to send users current latitude and longitude from a button click in MainActivity to MapFragment(Fragment). I use interface from fragment implemented inMainActivity but when i try .

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Multiple Root Tags Android Studio

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Методы лечения различных ошибок в Android Studio при разработке проекта

Сегодня хотел бы поделиться своим анализом и способами лечением разных ошибок при разработке своего продукта в Android Studio. Лично я, не раз сталкивался с различными проблемами и ошибками при компиляции и/или тестировании мобильного приложения. Данный процесс, всегда однообразный и в 99% случаев и всегда нужно тратить n-колличество времени на его устранение. Даже, когда ты уже сталкивался с данной проблемой, ты все равно идешь в поисковик и вспоминаешь, как же решить ту или иную ситуацию.

Я для себя завел файлик, в котором отметил самые частые ошибки — потратив на это несколько часов и перечислил самые популярные ошибки (в дальнейшем планирую просто их запомнить), чтоб сократить свое время в дальнейшем.

Итак, начну по порядку с самой распространенной проблемы и дальше буду перечислять их по мере появления:

1) Если подчеркивает красным код, где используются ресурсы: R. — попробовать (но вероятно не поможет): Build -> Clean Project.

В принципе на Build -> Clean Project можно не терять времени, а лучше всего — слева переключиться на Project, открыть каталог .idea, затем каталог libraries и из него удалить все содержимое. Затем нажать кнопку Sync Project. А затем (если все еще красное, но скорее всего уже будет все ок ) Build -> Clean Project.

2) После внезапного выключения компьютера, после перезапуска может быть во всех проектах весь код красным. Перед этим может быть ошибка: Unable to create Debug Bridge: Unable to start adb server: Unable to obtain result of ‘adb version’. Есть три решения — первое помогло, второе нет (но может быть для другого случая), а третье — не пробовал:

а) File — Invalidate Caches/Restart — Invalidate and Restart

б) Закрыть студию. В корне папки проекта удалить файл(ы) .iml и папку .idea. Вновь запустить студию и импортировать проект.

в) Нажать Ctrl-Alt-O и запустить оптимизацию импорта.

Кстати, adb сервер можно проверить на версию (и работоспособность) и затем перезапустить:

3) Если Android Studio выдает приблизительно такую ошибку: Error:Execution failed for task ‘:app:dexDebug’.

Надо слева переключиться на опцию Project, найти и удалить папку build которая лежит в папке app, т.е. по пути app/build. Затем перестроить весь проект заново: Build -> Rebuild Project.

Такое же решение если ошибка типа: «не могу удалить (создать) папку или файл» и указан путь, который в ведет в app/build. Тоже удаляем папку build и ребилдим проект.

4) В сообщении об ошибке упоминается heap — виртуальная память. А ошибка обычно вызвана ее нехваткой, т.е. невозможностью получить запрашиваемый объем. Поэтому этот запрашиваемый объем надо уменьшить, т.е. переписать дефолтное значение (обычно 2048 MB которое можно изменить в настройках), на меньшее 1024 MB.

В файле проекта gradle.properties пишем:

5) Android Studio пришет примерно такую ошибку: Plugin is too old, please update to a more recent version, or set ANDROID_DAILY_OVERRIDE environment variable to «83648b99316049d63656d7276cb19cc7e95d70a5»

Возможные причины (кроме необходимости регулярного обновления SDK):

а) Загруженный проект был скомпилирован с помощью уже несовместимого старого gradle плагина. В этом случае надо найти и подключить в своем build.gradle проекта этот более старый плагин. т.е. попробовать более старые версии, например: 1.1.3 (часто именно 1.1.x и подходит).

Найти все версии можно здесь.

б) Если в build.gradle проекта используется beta-версия плагина — это означает, что срок ее истек. Посмотреть последние релизы (продакшн и бета) можно также здесь:

6) Иногда при подключении сторонних библиотек могут дублироваться некоторые файлы (обычно связанные с лицензированием). В сообщении будет что-то содержащее слова: duplicate files. Решение — надо посмотреть в сообщении об ошибке или в документации подключенной сторонней библиотеки — какие именно файлы стали избыточными, и перечислить их в build.gradle модуля для исключения (exclude) из билда.

Это делается в директиве packagingOptions (которая, в свою очередь, находится в директиве android).

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String resources

A string resource provides text strings for your application with optional text styling and formatting. There are three types of resources that can provide your application with strings:

String XML resource that provides a single string. String Array XML resource that provides an array of strings. Quantity Strings (Plurals) XML resource that carries different strings for pluralization.

All strings are capable of applying some styling markup and formatting arguments. For information about styling and formatting strings, see the section about Formatting and Styling.

String

A single string that can be referenced from the application or from other resource files (such as an XML layout).

Note: A string is a simple resource that is referenced using the value provided in the name attribute (not the name of the XML file). So, you can combine string resources with other simple resources in the one XML file, under one element.

file location: res/values/filename.xml
The filename is arbitrary. The element’s name is used as the resource ID. compiled resource datatype: Resource pointer to a String . resource reference: In Java: R.string.string_name
In XML: @string/string_name syntax: elements: Required. This must be the root node.

A string, which can include styling tags. Beware that you must escape apostrophes and quotation marks. For more information about how to properly style and format your strings see Formatting and Styling, below.

name String. A name for the string. This name is used as the resource ID. example: XML file saved at res/values/strings.xml :

This layout XML applies a string to a View:

This application code retrieves a string:

Kotlin

You can use either getString(int) or getText(int) to retrieve a string. getText(int) retains any rich text styling applied to the string.

String array

An array of strings that can be referenced from the application.

Note: A string array is a simple resource that is referenced using the value provided in the name attribute (not the name of the XML file). As such, you can combine string array resources with other simple resources in the one XML file, under one element.

file location: res/values/filename.xml
The filename is arbitrary. The element’s name is used as the resource ID. compiled resource datatype: Resource pointer to an array of String s. resource reference: In Java: R.array.string_array_name
In XML: @[package:]array/string_array_name syntax: elements: Required. This must be the root node.

Defines an array of strings. Contains one or more elements.

name String. A name for the array. This name is used as the resource ID to reference the array. A string, which can include styling tags. The value can be a reference to another string resource. Must be a child of a element. Beware that you must escape apostrophes and quotation marks. See Formatting and Styling, below, for information about to properly style and format your strings.

example: XML file saved at res/values/strings.xml :

This application code retrieves a string array:

Kotlin

Quantity strings (plurals)

Different languages have different rules for grammatical agreement with quantity. In English, for example, the quantity 1 is a special case. We write «1 book», but for any other quantity we’d write «n books». This distinction between singular and plural is very common, but other languages make finer distinctions. The full set supported by Android is zero , one , two , few , many , and other .

The rules for deciding which case to use for a given language and quantity can be very complex, so Android provides you with methods such as getQuantityString() to select the appropriate resource for you.

Although historically called «quantity strings» (and still called that in API), quantity strings should only be used for plurals. It would be a mistake to use quantity strings to implement something like Gmail’s «Inbox» versus «Inbox (12)» when there are unread messages, for example. It might seem convenient to use quantity strings instead of an if statement, but it’s important to note that some languages (such as Chinese) don’t make these grammatical distinctions at all, so you’ll always get the other string.

The selection of which string to use is made solely based on grammatical necessity. In English, a string for zero is ignored even if the quantity is 0, because 0 isn’t grammatically different from 2, or any other number except 1 («zero books», «one book», «two books», and so on). Conversely, in Korean only the other string is ever used.

Don’t be misled either by the fact that, say, two sounds like it could only apply to the quantity 2: a language may require that 2, 12, 102 (and so on) are all treated like one another but differently to other quantities. Rely on your translator to know what distinctions their language actually insists upon.

It’s often possible to avoid quantity strings by using quantity-neutral formulations such as «Books: 1». This makes your life and your translators’ lives easier, if it’s an acceptable style for your application.

Note: A plurals collection is a simple resource that is referenced using the value provided in the name attribute (not the name of the XML file). As such, you can combine plurals resources with other simple resources in the one XML file, under one element.

file location: res/values/filename.xml
The filename is arbitrary. The

element’s name is used as the resource ID. resource reference: In Java: R.plurals.plural_name syntax: elements: Required. This must be the root node.

A collection of strings, of which, one string is provided depending on the amount of something. Contains one or more elements.

name String. A name for the pair of strings. This name is used as the resource ID. A plural or singular string. The value can be a reference to another string resource. Must be a child of a

element. Beware that you must escape apostrophes and quotation marks. See Formatting and Styling, below, for information about to properly style and format your strings.

quantity Keyword. A value indicating when this string should be used. Valid values, with non-exhaustive examples in parentheses:

Value	Description
zero	When the language requires special treatment of the number 0 (as in Arabic).
one	When the language requires special treatment of numbers like one (as with the number 1 in English and most other languages; in Russian, any number ending in 1 but not ending in 11 is in this class).
two	When the language requires special treatment of numbers like two (as with 2 in Welsh, or 102 in Slovenian).
few	When the language requires special treatment of «small» numbers (as with 2, 3, and 4 in Czech; or numbers ending 2, 3, or 4 but not 12, 13, or 14 in Polish).
many	When the language requires special treatment of «large» numbers (as with numbers ending 11-99 in Maltese).
other	When the language does not require special treatment of the given quantity (as with all numbers in Chinese, or 42 in English).

example: XML file saved at res/values/strings.xml :

XML file saved at res/values-pl/strings.xml :

Kotlin

When using the getQuantityString() method, you need to pass the count twice if your string includes string formatting with a number. For example, for the string %d songs found , the first count parameter selects the appropriate plural string and the second count parameter is inserted into the %d placeholder. If your plural strings do not include string formatting, you don’t need to pass the third parameter to getQuantityString .

Format and style

Here are a few important things you should know about how to properly format and style your string resources.

Handle special characters

When a string contains characters that have special usage in XML, you must escape the characters according to the standard XML/HTML escaping rules. If you need to escape a character that has special meaning in Android you should use a preceding backslash.

By default Android will collapse sequences of whitespace characters into a single space. You can avoid this by enclosing the relevant part of your string in double quotes. In this case all whitespace characters (including new lines) will get preserved within the quoted region. Double quotes will allow you to use regular single unescaped quotes as well.

Any of the following:

• \’
• Enclose the entire string in double quotes ( «This’ll work» , for example)

Character	Escaped form(s)
@	\@
?	\?
New line	\n
Tab	\t
U+XXXX Unicode character	\uXXXX
Single quote ( ‘ )
Double quote ( » )	\» Note that surrounding the string with single quotes does not work. Whitespace collapsing and Android escaping happens after your resource file gets parsed as XML. This means that (space, punctuation space, Unicode Em space) all collapse to a single space ( » » ), because they are all Unicode spaces after the file is parsed as an XML. To preserve those spaces as they are, you can either quote them ( » » ) or use Android escaping ( \u0032 \u8200 \u8195 ). Note: From XML parser’s perspective, there is no difference between «Test this» and «Test this» whatsoever. Both forms will not show any quotes but trigger Android whitespace-preserving quoting (that will have no practical effect in this case). Formatting strings If you need to format your strings, then you can do so by putting your format arguments in the string resource, as demonstrated by the following example resource. In this example, the format string has two arguments: %1$s is a string and %2$d is a decimal number. Then, format the string by calling getString(int, Object. ) . For example: Kotlin Styling with HTML markup You can add styling to your strings with HTML markup. For example: The following HTML elements are supported: Bold: , Italic: , , 25% larger text: 20% smaller text: Setting font properties: . Examples of possible font families include monospace , serif , and sans_serif . Setting a monospace font family: Strikethrough: , , Underline: Superscript: Subscript: Bullet points: , Line breaks: Division: If you aren’t applying formatting, you can set TextView text directly by calling setText(java.lang.CharSequence) . In some cases, however, you may want to create a styled text resource that is also used as a format string. Normally, this doesn’t work because the format(String, Object. ) and getString(int, Object. ) methods strip all the style information from the string. The work-around to this is to write the HTML tags with escaped entities, which are then recovered with fromHtml(String) , after the formatting takes place. For example: Store your styled text resource as an HTML-escaped string: In this formatted string, a element is added. Notice that the opening bracket is HTML-escaped, using the notation. Then format the string as usual, but also call fromHtml(String) to convert the HTML text into styled text: Kotlin Because the fromHtml(String) method formats all HTML entities, be sure to escape any possible HTML characters in the strings you use with the formatted text, using htmlEncode(String) . For instance, if you are formatting a string that contains characters such as » fromHtml(String) , the characters come out the way they were originally written. For example: Kotlin Styling with spannables A Spannable is a text object that you can style with typeface properties such as color and font weight. You use SpannableStringBuilder to build your text and then apply styles defined in the android.text.style package to the text. You can use the following helper methods to set up much of the work of creating spannable text: Kotlin The following bold , italic , and color methods wrap the helper methods above and demonstrate specific examples of applying styles defined in the android.text.style package. You can create similar methods to do other types of text styling. Kotlin Here’s an example of how to chain these methods together to apply various styles to individual words within a phrase: Kotlin The core-ktx Kotlin module also contains extension functions that make working with spans even easier. You can check out the android.text package documentation on GitHub to learn more. For more information on working with spans, see the following links: Styling with annotations Applying a custom typeface to the word “text” in all languages Example — adding a custom typeface Load the string resource and find the annotations with the font key. Then create a custom span and replace the existing span. Kotlin If you’re using the same text multiple times, you should construct the SpannableString object once and reuse it as needed to avoid potential performance and memory issues. For more examples of annotation usage, see Styling internationalized text in Android Annotation spans and text parceling Because Annotation spans are also ParcelableSpans , the key-value pairs are parceled and unparceled. As long as the receiver of the parcel knows how to interpret the annotations, you can use Annotation spans to apply custom styling to the parceled text. To keep your custom styling when you pass the text to an Intent Bundle, you first need to add Annotation spans to your text. You can do this in the XML resources via the tag, as shown in the example above, or in code by creating a new Annotation and setting it as a span, as shown below: Kotlin Retrieve the text from the Bundle as a SpannableString and then parse the annotations attached, as shown in the example above. Kotlin For more information on text styling, see the following links: Content and code samples on this page are subject to the licenses described in the Content License. Java is a registered trademark of Oracle and/or its affiliates. Источник Оцените статью Вам также может понравиться Как деактивировать режим наушников на смартфоне с Android? 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