comment débuter en kotlin android
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 :
Citation:
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:
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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 ??
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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
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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
