comment débuter en kotlin android

**DaTheWolf** · 04/09/2021, 16h49

Bonjour à tous, bonne rentrée aux scolaires, 😁
J'ai créé ma première version de ma première classe kotlin pour un premier exercice, développer une calculatrice . J'obtiens une erreur quand je lance l'application la vue ne s'affiche pas.
Il indique une erreur ici :

setContentView(R.layout.activity_main)

09/04 21:23:47: Launching 'Unnamed' on Pixel_3a_API_30_x86.
Install successfully finished in 944 ms.
Could not identify launch activity: Default Activity not found
Error while Launching activity

class kotlin6:

Code :

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package one.empty3.apps.simplecalculator
import android.app.Activity
import android.app.Application
import android.os.Bundle
import android.view.View
import android.widget.Button
import android.widget.EditText
import androidx.appcompat.app.AppCompatActivity
import one.empty3.apps.simplecalculator.R
 
class MainActivity : AppCompatActivity() {
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_main)
            var buttonsNumbers = arrayListOf<Int>(R.id.button0, R.id.button1, R.id.button2, R.id.button3,
                R.id.button4, R.id.button5, R.id.button6, R.id.button7,
                R.id.button8, R.id.button9)
            val i:Int = 0;
 
            var j: Int = 0
            val editText : EditText = findViewById(R.id.editTextCalculus)
 
            for (i:Int in buttonsNumbers) {
                var buttonActive = findViewById<Button>(i)
                buttonActive.setOnClickListener({
                    editText.setText(editText.getText().append(""+j))
                })
                j = j+1
            }
        }
}

le layout est dans :
SimpleCalculator/app/src/main/res/layout-port-notouch-keysexposed-nokeys
Je me demande si c'est le nom du dossier qui pose problème ??

Code XML :

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="one.empty3.apps.simplecalculator">
 
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.SimpleCalculator" >
        <activity
            android:name="one.empty3.apps.simplecalculator.MainActivity"
            android:label="Simple Calculator"
            android:theme="@style/Theme.SimpleCalculator" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>    </application>
 
</manifest>

Layout

Code XML :

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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/constraintWindows"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:visibility="visible">
 
    <Button
        android:id="@+id/button1"
        android:layout_width="135dp"
        android:layout_height="68dp"
        android:layout_marginStart="1dp"
        android:layout_marginTop="152dp"
        android:text="1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 
    <Button
        android:id="@+id/button2"
        android:layout_width="136dp"
        android:layout_height="68dp"
        android:text="2"
        tools:layout_editor_absoluteX="136dp"
        tools:layout_editor_absoluteY="152dp" />
 
    <Button
        android:id="@+id/button3"
        android:layout_width="136dp"
        android:layout_height="68dp"
        android:layout_marginStart="272dp"
        android:layout_marginTop="152dp"
        android:text="3"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 
    <Button
        android:id="@+id/button4"
        android:layout_width="135dp"
        android:layout_height="68dp"
        android:text="4"
        tools:layout_editor_absoluteX="1dp"
        tools:layout_editor_absoluteY="220dp" />
 
    <Button
        android:id="@+id/button5"
        android:layout_width="136dp"
        android:layout_height="68dp"
        android:layout_marginStart="136dp"
        android:layout_marginTop="220dp"
        android:text="5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 
    <Button
        android:id="@+id/button6"
        android:layout_width="136dp"
        android:layout_height="68dp"
        android:layout_marginStart="272dp"
        android:layout_marginTop="220dp"
        android:text="6"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 
    <Button
        android:id="@+id/button7"
        android:layout_width="135dp"
        android:layout_height="69dp"
        android:text="7"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_editor_absoluteY="281dp" />
 
    <Button
        android:id="@+id/button8"
        android:layout_width="136dp"
        android:layout_height="69dp"
        android:text="8"
        tools:layout_editor_absoluteX="136dp"
        tools:layout_editor_absoluteY="281dp" />
 
    <Button
        android:id="@+id/button9"
        android:layout_width="136dp"
        android:layout_height="69dp"
        android:text="9"
        tools:layout_editor_absoluteX="272dp"
        tools:layout_editor_absoluteY="281dp" />
 
    <Button
        android:id="@+id/dotButton"
        android:layout_width="135dp"
        android:layout_height="68dp"
        android:text="."
        tools:layout_editor_absoluteX="1dp"
        tools:layout_editor_absoluteY="348dp" />
 
    <Button
        android:id="@+id/button0"
        android:layout_width="136dp"
        android:layout_height="68dp"
        android:layout_marginStart="136dp"
        android:layout_marginTop="348dp"
        android:text="0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 
    <Button
        android:id="@+id/equalButton"
        android:layout_width="136dp"
        android:layout_height="68dp"
        android:layout_marginStart="272dp"
        android:layout_marginTop="348dp"
        android:text="="
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 
    <Button
        android:id="@+id/addButton"
        android:layout_width="135dp"
        android:layout_height="68dp"
        android:text="+"
        tools:layout_editor_absoluteX="1dp"
        tools:layout_editor_absoluteY="416dp" />
 
    <Button
        android:id="@+id/multButton"
        android:layout_width="136dp"
        android:layout_height="68dp"
        android:layout_marginStart="136dp"
        android:layout_marginTop="416dp"
        android:text="*"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 
    <Button
        android:id="@+id/button15"
        android:layout_width="136dp"
        android:layout_height="68dp"
        android:text="sqrt"
        tools:layout_editor_absoluteX="272dp"
        tools:layout_editor_absoluteY="416dp" />
 
    <Button
        android:id="@+id/substractButton"
        android:layout_width="135dp"
        android:layout_height="69dp"
        android:text="-"
        tools:layout_editor_absoluteX="1dp"
        tools:layout_editor_absoluteY="477dp" />
 
    <Button
        android:id="@+id/divideButton"
        android:layout_width="136dp"
        android:layout_height="69dp"
        android:text="/"
        tools:layout_editor_absoluteX="135dp"
        tools:layout_editor_absoluteY="477dp" />
 
    <Button
        android:id="@+id/button18"
        android:layout_width="136dp"
        android:layout_height="69dp"
        android:layout_marginStart="272dp"
        android:layout_marginTop="476dp"
        android:text="pow"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 
    <EditText
        android:id="@+id/editTextTextPersonName"
        android:layout_width="409dp"
        android:layout_height="57dp"
        android:layout_marginTop="32dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="Name"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 
</androidx.constraintlayout.widget.ConstraintLayout>

merci d'avance..
Manuel

comment débuter en kotlin android

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