Posts (page 46)
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6 min readTo use hours, minutes, and seconds in delay using Kotlin, you can create a delay function that takes the duration in milliseconds as a parameter. To convert hours, minutes, and seconds to milliseconds, you can use the following formula:delayInMillis = (hours * 3600000) + (minutes * 60000) + (seconds * 1000)You can then use this delayInMillis value as the parameter for the delay function to pause the execution of your code for the specified duration.
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5 min readTo choose all components in a RecyclerView using Kotlin, you can iterate through all the items in the RecyclerView and select each one programmatically. You can achieve this by keeping track of the selected items in a list or set, and updating the selection status of each item as the user interacts with them.You can also implement a "Select All" button that, when clicked, selects all items in the RecyclerView by updating the selection status of each item.
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6 min readTo make a download progress indicator in Kotlin, you can use a ProgressBar view in your layout file to visually represent the progress of the download. In your Kotlin code, you can update the progress of the download by setting the progress attribute of the ProgressBar view. You can track the progress of the download by using a download manager or by calculating the percentage of the file downloaded.
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5 min readTo truncate a Kotlin Duration, you can use the toComponents() function to break down the duration into its individual components like days, hours, minutes, seconds, and milliseconds. You can then create a new Duration object using the truncated components to get the desired truncated duration. Another option is to convert the duration to milliseconds, truncate the milliseconds as needed, and then convert it back to a Duration object.
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4 min readTo show contact details after a contact search in Kotlin, you can use the ContactsContract API to query the device's contact database based on the search input. Once you have retrieved the contact details, you can display the relevant information such as the contact's name, phone number, email address, etc. on the screen using TextViews or other UI components. You can also provide options for the user to perform actions such as calling or messaging the contact directly from your app.
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3 min readTo map each column of a JSON array in Kotlin, you can use the Gson library to parse the JSON string into a data class representing the structure of the JSON object. You can then iterate over the array and access each column by its corresponding property in the data class. Alternatively, you can use the kotlinx.serialization library to deserialize the JSON string into a Kotlin data class.
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6 min readIn order to import an extension function in Kotlin, you need to define the function as an extension function in a separate file or within the same file where you plan to use it. The extension function should be defined with the receiver type specified before the function name.Once the extension function is defined, you can import it in a different file by using the import statement followed by the fully qualified name of the file containing the extension function.
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6 min readIn Kotlin, to get a data class value given another one, you can use the componentN() functions generated automatically for data classes. These functions allow you to access the properties of the data class based on their index. For example, if you have a data class called Person with properties name and age, you can get the age of a person by calling person.component2(). This will return the value of the age property for the given Person object.
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6 min readTo navigate to a Flutter screen from Kotlin, you can use platform channels to communicate between the two platforms. By creating a method channel in Flutter and invoking it from Kotlin, you can trigger navigation to a new Flutter screen. Make sure to handle any data or parameters that need to be passed between the two platforms during the navigation process. This approach allows for seamless navigation between Kotlin and Flutter screens within a single mobile application.
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7 min readTo add onBackPressed() functionality to the Privacy Policy in Kotlin, you would first need to override the onBackPressed() method in your activity or fragment class. Inside this method, you can perform the desired actions when the user presses the back button while viewing the Privacy Policy.
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4 min readTo create a Kotlin UInt from Java, you can use the following code snippets:In Java: import kotlin.jvm.JvmField; public class JavaClass { @JvmField public static int createUInt() { return 10; } } In Kotlin: val uintValue = JavaClass.createUInt().toUInt() By using the toUInt() function in Kotlin, you can convert the Java integer value to Kotlin's UInt data type.[rating:f8e7b244-16c9-4deb-b39c-cdcab74f465d]What is the purpose of using unsigned integers in kotlin.
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3 min readTo write a formula in Kotlin, you need to start by declaring a function that represents the formula you want to write. You can define the input parameters for the function and specify the return type. Inside the function body, you can perform the necessary calculations to implement the formula. You can use operators such as +, -, *, /, and % for basic arithmetic operations, as well as functions from the standard library for more complex calculations.