Posts Tagged with Kotlin

After updating my app to compile with API level 30 (Android R, 11), I can’t see AdMob test ads, and I’m receiving this error in the log: Strict Secure Cookie policy does not allow setting a secure cookie for http://googleads.g.doubleclick.net/ for apps targeting >= R. Please either use the ‘https:’ scheme for this URL or omit the ‘Secure’ directive in the cookie value. I’m using the lastest AdMob version, and I don’t have “org.

Here is a sample of error message. Duplicate class kotlin.collections.jdk8.CollectionsJDK8Kt found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk8-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.0) Duplicate class kotlin.internal.jdk7.JDK7PlatformImplementations found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk7-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.6.0) Duplicate class kotlin.internal.jdk8.JDK8PlatformImplementations found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk8-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.0) Duplicate class kotlin.io.path.ExperimentalPathApi found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk7-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.6.0) Duplicate class kotlin.io.path.PathRelativizer found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk7-1.6.0 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.6.0) Duplicate class kotlin.io.path.PathsKt found in modules jetified-kotlin-stdlib-1.8.0 (org.jetbrains.kotlin:kotlin-stdlib:1.8.0) and jetified-kotlin-stdlib-jdk7-1.

Method 1 : Try Invalidating Android Studio Cache Just go File -> Invalidate Cache & Restart. So, Android Studio will remove cache and rebuild it and the project itself. If this solves the error, good for you. If not, try the next step. Method 2 : Remove Unused Modules Click Command+Shift+F, type modules.xml, open the file, remove the modules that cause the error. If the error persists, try the 3rd method.

All you need to start creating Android app in Kotlin. Kotlin Syntax Print to console print("Amit Shekhar") println("Amit Shekhar") Constants and Variables var name = "Amit Shekhar" val name = "Amit Shekhar" Assigning the null value var otherName : String? otherName = null Verify if value is null text?.let { val length = text.length } // or simply val length = text?.length Concatenation of strings var firstName = "Amit" var lastName = "Shekhar" var message = "My name is: $firstName$lastName" New line in string val text = """ |First Line |Second Line |Third Line """.

Use this code in your app’s `src/MainActivity.kt’ file. import android.app.ActivityManager import android.app.ActivityManager.RunningTaskInfo import android.content.Context import android.os.Bundle import android.widget.TextView import androidx.appcompat.app.AppCompatActivity import java.util.* class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" val textView: TextView = findViewById(R.id.textView) val activityManager = getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager val recentTasks: List<RunningTaskInfo> = Objects.requireNonNull(activityManager).getRunningTasks(Int.MAX_VALUE) for (i in recentTasks.indices) { textView.text = "Application executed: ${recentTasks[i].

The idea is to use this code snippet. ColorDrawable[] colorDrawables = { new ColorDrawable(Color.RED), new ColorDrawable(Color.BLUE), new ColorDrawable(Color.GREEN) }; TransitionDrawable transitionDrawable = new TransitionDrawable(colorDrawables); textView.setBackground(transitionDrawable); transitionDrawable.startTransition(2000); In this code snippet, we created a list of colorDrawables, then feed them to the TransitionDrawable. And now we have an animating color change, so we pass it to the setBackground to get the animating colors in the background. Got the idea ?

The main idea is to use view.setBackgroundColor(getColor(R.color.colorAccent)) to the selected view (list item). Let’s see a complete example. use this xml code in res/layout/activity_main.xml. <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="8dp" tools:context=".MainActivity"> <ListView android:id="@+id/listView" android:layout_width="match_parent" android:layout_height="match_parent" /> </RelativeLayout> use this Kotlin code in src/MainActivity.kt. import android.os.Build import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.widget.ArrayAdapter import android.widget.ListView class MainActivity : AppCompatActivity() { var operatingSystem: Array<String> = arrayOf("Android", "IPhone", "WindowsMobile", "Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X") override fun onCreate(savedInstanceState: Bundle?

The idea is to create an a list item xml, and give it the design choices you want. If you want to change the list item color, use this xml code android:textColor="@android:color/holo_orange_dark". If you want to change the text to italic or bold, use this xml android:textStyle="italic|bold". And even if you want to change the font itself, you can by this font-family property in xml android:fontFamily="sans-serif-condensed". Now, you got the idea.