I need to start to apply backend contents to fragment but don't know how to start
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kotlinx.android.synthetic unused android studio issue
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The 'kotlin-android-extensions' Gradle plugin is deprecated
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I made a very basic dice roll app (in Kotlin) using Android Studio with an imageView and a button. The imageView's id is "imageView" and the button's id is "button". But in the MainActivity.kt file the id names are red in colour and when I hover over them it says "unresolved reference: imageView (or button)"
Why is this happening and how do I solve this?
The id names are same on both the activity_main.xml and MainActivity.kt file:
Your activity needs to know what those names refer to, the platform doesn't automatically link views inflated from an XML layout file. Historically this is done in Android by calling the findViewById() method like this:
lateinit var myTextView
override fun onCreate(savedInstanceBundle: Bundle?) {
super.onCreate(savedInstanceBundle)
// The layout file is "inflated" automatically here
setContentView(R.layout.layout_name)
// Then we can assign a reference to views by ID:
myTextView = findViewById<TextView>(R.id.text_view_name)
}
Since then, shortcuts have come around: Butterknife, Kotlin Synthetics, or the current accepted standard, Jetpack View Binding. if you just need to grab a few views quick call findViewByid() but as you work with Android it's worth taking the time to enable View Binding to cut down on this boilerplate code.
just restart by using invalidate caches/Restart as you seeing this image and after this clean and then rebuild your project
You have to use kotlin extension.
In your app gradle.build add apply plugin: 'kotlin-android-extensions'
In your class add import for import kotlinx.android.synthetic.main.<layout>.* where is the filename of your layout.
I'm re-writing my app with this layout in Android (using Android Studio 3.6 & Java 8) and noticed that I can't directly set the background color of an EditText or Spinner because the background used contains the e.g. EditText's line (the line the text is written on).
To work around that in my iOS app I simply gave that UI element (with an otherwise transparent background) a View parent that uses the right background color. In Android Studio this works the same way if I use an e.g. LinearLayout as parent but I don't need that layout's full functionality and I'm worried that "abusing" LinearLayouts like this multiple times might affect performance.
There is a View widget in Android Studio but it's not possible to add an EditText or Spinner as its child.
Are there any layouts/views that can be added via Android Studio's UI builder or through xml and that act as the "empty" container I need? What's the best layout to use performance-wise?
Using Android Studio's built in Navigation Drawer Activity several files are created automatically. content_main is included automatically in the hello World application and I've changed content main to have some menu item buttons and another include. This include goes to the list_of_items layout.
My question is, how do I update the list_of_items layout with new information from a seperate class?
include merges the code at runtime so all it's views and id's will be available to you. you can do whatever needed.
for second point pass value to be updated in new class constructor then implement logic in it's method and return the value everything from mainactivity
in eclipse ADT plugin when i create a preference activity it provides two modes design view and the xml file of the preference activity. The design view had the tab name "structure" that provides the easy adding of values to attributes through certain input boxes. But in android studio i can create an android XML file to create an activity but i cannot find the designer view of the activity, the "structure" tab?
its no longer available and in android you have to do it manually i.e.write elements and attributes set values. Do it in the same XML file.
Actually I'm developing an app for Android TV. I used the BrowseFragment, from leanback support library v17, to navigate by the submenus. But, now I'm trying to build the home activity, like Android TV device app. You can see it here: https://medium.com/building-for-android-tv/building-for-android-tv-episode-1-2d03f9ba541e. And I have problems to know how i can to make a simple row layout, like recommendations. I've tried to do it with a RowsFragment class but ever i have an error inflating XML.
Just I would like the BrowseFragment without the left "drawer".
Thank you four your time and sorry for my poor english.
Inside of your activity that extends BrowseFragment, this will remove the left drawer with the headings...
setHeadersState(HEADERS_DISABLED);
If you're using the Android TV sample app, this would be in the MainFragment class in the following method...
setupUIElements()