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navigation

#sdk
#activity
#linearlayout
#gravity
#customview
#xml
#textview
#ellipsize
#design
#letterspacing
#pattern
#intent
#optimization
#multitouch
#theme
#permission
#camera
#library
#recyclerview
#remoteviews
#kotlin
#color
#alpha
#startup
#fullscreen
#andriodstudio
#newproject
#logcat
#crash
#tool
#widget
#preview
#debug
#restart
#focus
#layouteditor
#email

horizontal linear layout by default aligns text views to their baselines

to make layoutParams.gravity work, call isBaselineAligned = false

#sdk #linearlayout #gravity

the letter spacing units in figma and text view are different

use this formula for text view: textview.letterSpacing = figmaSpacing / fontSizeDp

#sdk #design #textview #letterspacing

obsolete since the release of the new logcat in android studio dolphin

the “show only selected application” logcat filter sometimes doesn't show the logs after a crash

to avoid this, create your own filter: edit filter configuration -> add(+) -> enter your app package

#andriodstudio #logcat #crash

libraries often contain strings for many locales that aren’t used in your app

to prevent unused locales from getting into the build, add line like this to the android.defaultConfig in app build.gradle

#library #locale #gradle

even if you chose kotlin when creating a new project, android studio will create a java folder for your code: app/src/main/java

you can easily rename it to kotlin: select java folder, press shift+F6, enter the new name and click refactor

#andriodstudio #newproject

when you create a custom view based on xml layout you extend your class from some view group and also have a root view group in the xml. as a result you get an extra container

to avoid this, use the <merge> tag in the xml as the root tag, and specify tools:parentTag="<your view group>"

#sdk #customview #xml

to apply an alpha (0..255) to your color, you can mask the rgb part, shift the alpha bytes and add it to the rgb part

(color and 0x00ffffff) or (alpha shl 24)

#kotlin #color #alpha

since android 10, there is gesture navigation in the system. if your custom view conflicts with gestures (e.g. drawing or slider), don't forget to add exclusion

it is recommended to override onLayout in your view and set exclusion there whenever the position or size are changed

#sdk #gestures #customview

one of the ways to optimize the recycler view is to call the setHasFixedSize(true). there is a common misunderstanding about what this method means

what it really means is that the recycler view should not change its size depending on its content, e.g. the number of items. this way it allows to optimize re-measuring

#library #recyclerview #optimization

when you create a widget – you need to set the preview

there is a wonderful utility for this

#tool #widget #preview