Android – Activity and lifecycle states Part 1

Android – Activity and lifecycle states Part 1

Activity is the most common component in Android app and the most crucial. It is usually used to display information to the device screen but there also times that you do not have to provide a user interface with an activity. To implement an activity you need to follow some steps: Extend the Ativity class Override selected lifecycle/hook methods, those at the picture above define other methods or nested classes needed to implement the activity update the AndroidManifest.xml file to include the activity so Android OS knows about it. Lifecycle…

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HMTL & CSS – lists styling

HMTL & CSS – lists styling

Let’s see a few properties that you can style lists. An unordered list. list-style-type – specifies the appearance of the list item marker. Values can take disc | circle | square | none | decimal | decimal-leading-zero | lower-roman | upper-roman | lower-greek | lower-latin | upper-latin | armenian | georgian | lower-alpha | upper-alpha | none  An ordered list list-style-position – specifies the position of the marker box. Values can take are: inside | outside. Default is outside. list-style-image – sets the image that will be used as the…

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Android – AndroidManifest.xml Part 1

Android – AndroidManifest.xml Part 1

The purpose of AndroidManifest.xml file is to give certain information to Android so the app will be executed, to Android build tools and to Google Play. The information that this file can have is: Name of the Java package Which components are exported to other apps All the component names (activities, services, receivers and providers) Which process will host the components What intents are handled What permissions that app must have Minimum and Target API levels the app requires Elements: <manifest> – the root element <application> – contains the elements…

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CSS – length units

CSS – length units

CSS has many different units and there are two types: absolute and relative length units. common relative units: em – relative to the font-size in the parent element. 2em; means 2 times bigger than the font in the parent element rem – the same as em but this is relative to the root element. Both are used for font-size . 2rem; % – relative to its parent element dimension vh & vw – viewport height & viewport width (viewport = browser window). It is like % but it is relative…

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Android – Intents

Android – Intents

An intent is a message one component send to another component to interact with or request some functionality from. Intents have data fields and some can be passed from one component to another like passing arguments to a method. One of those fields is the name of the component that will handle the intent. If you specify the name then this intent is called explicit intent. If the name is omitted, then you need to specify other fields, action, data and/or category. This intent is called implicit intent and is…

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