Android – Activity callback/hook methods PART 3

Android – Activity callback/hook methods PART 3

You can read Part 1 and Part 2. This part will cover the 7 hook methods: onCreate() – It is called first when activity launched and it is called only one time. Here you initialize the views, bind data to lists etc. Next is onStart() onStart() – It is called when the activity is becoming visible to the user. Next is onResume() only if the activity was at the background and now comes to the foreground. onResume() – It is when the activity starts interacting with the user and it…

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Android – Starting an Activity PART 2

Android – Starting an Activity PART 2

You can read PART 1 here. You can launch activities on demand with startActivity() and startActivityForResult() startActivity() Launches a new activity and it does not return any information when the activity exits. It has one argument, an intent to start. You can read more here. startActivityForResult() Launches an activity and you will get a result when the activity finished. It can take up to 3 arguments, the intent to start, the request code (int) that identifies the request to the 2nd activity and options as a bundle. At the 1st…

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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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