Posts (page 44)
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4 min readTo select all checkboxes at once in Kotlin, you can loop through all the checkboxes in your layout and set their isChecked property to true. This can be done using a for loop or by using the forEach{} function on the parent layout to iterate through all the child views. Alternatively, you can maintain a list of all the checkboxes in your layout and set their isChecked property to true using forEach{} on the list. This way, all checkboxes will be selected at once in Kotlin.
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3 min readIn Kotlin, you can automate clicking a button by using the Espresso testing framework.First, you need to add the necessary dependencies in your build.gradle file. Then, you can use Espresso's onView() method to find the button by its id and perform a click action on it.You can also set a delay before clicking the button using IdlingResource or Thread.sleep() methods. This way, you can simulate an automated clicking action in your Kotlin app.
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3 min readTo cancel a scheduled local notification in Kotlin, you first need to have a reference to the NotificationManager system service. You can retrieve this by calling getSystemService(Context.NOTIFICATION_SERVICE) on your Context object.Once you have a reference to the NotificationManager, you can cancel a specific notification by calling cancel() on the NotificationManager object and passing in the ID of the notification you wish to cancel.
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6 min readTo return a boolean when using coroutines in Kotlin, you can use a standard approach with the suspend keyword in your function signature. You can define a suspend function that performs a certain task and returns a boolean value based on the result of that task. Within the function, you can use coroutine builders such as async or launch to achieve asynchronous operation.
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5 min readTo make an HTTP request within onCreate in Kotlin, you can use libraries such as Retrofit or Volley.First, you need to add the necessary dependencies for the library you choose in your build.gradle file. Then, you can create an instance of the HTTP client and make a request to the desired endpoint.For example, with Retrofit, you would define an interface with the HTTP methods you want to use and create a Retrofit object with the base URL.
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7 min readTo make dependent input fields in Kotlin, you can use methods like addTextChangedListener() on your EditText fields to listen for changes in the input. By doing this, you can set up logic to update other input fields based on the changes in the dependent field. You can also use observers or data binding to keep track of the values in the input fields and update them accordingly.
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4 min readTo justify text in a TextView in Kotlin, you can use the gravity property and set it to Gravity.CENTER. This will center the text horizontally within the TextView. Alternatively, you can use the textAlign property and set it to center. Both of these approaches will justify the text in the TextView to the center.[rating:f8e7b244-16c9-4deb-b39c-cdcab74f465d]What is the impact of text justification on text wrapping in a TextView in Kotlin.
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4 min readTo create a custom method for the by operator in Kotlin, you need to define a class that implements the ReadOnlyProperty interface. This interface has a single method getValue() which will be called by the by operator to get the value of the property. Inside the getValue() method, you can return any custom logic to calculate the value of the property.Here is an example of how to create a custom method for the by operator in Kotlin: import kotlin.properties.ReadOnlyProperty import kotlin.reflect.
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4 min readTo disable compose reloading in Kotlin, you can remove the recompose function that triggers the recomposition of the UI elements. Instead, you can manually trigger recomposition only when needed by using the Modifier.recompose function. This way, you have more control over when the UI elements are recomposed, allowing you to optimize performance and avoid unnecessary re-renders of the UI.
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5 min readTo convert a string to JSON in Kotlin, you can use the JSONObject class from the org.json package. Simply create a new JSONObject instance passing the string as a parameter, and then you can access the JSON properties using the appropriate methods provided by the JSONObject class. Remember to handle any exceptions that may occur during the conversion process.[rating:f8e7b244-16c9-4deb-b39c-cdcab74f465d]How to create a JSON object from a string in Kotlin.
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5 min readTo parse a timestamp from Firestore to Kotlin, you can retrieve the timestamp data from Firestore as a Timestamp object. Once you have this object, you can convert it to a Long Unix timestamp using the toDate().time method. This will give you the milliseconds since epoch timestamp that you can then use in your Kotlin code as needed.Here is an example of how you can parse a timestamp from Firestore to Kotlin: // Assuming you have a Firestore document snapshot val timestamp = documentSnapshot.
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7 min readTo read properties as immutable strings in Kotlin, you can use the val keyword to declare the property as read-only. This means that the property can only be initialized once and cannot be changed afterwards.For example, you can declare a read-only property like this: val name: String = "Hello" In this case, the name property is of type String and is initialized with the value "Hello". Since it is declared with the val keyword, it cannot be reassigned to a different value.