premiere page mais crash

app/src/main/java/com/example/leboncoin/galerie.kt

@@ -11,40 +11,17 @@ import android.hardware.SensorManager
 import android.util.Log
 import android.widget.EditText
 import android.widget.LinearLayout
+import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
 
-class galerie : Activity(), SensorEventListener {
-    private var mSensorManager: SensorManager? = null
-    private var accelerometer: Sensor? = null
-    private var V: EditText? = null
-    override fun onCreate(savedInstanceState: Bundle?) {
+class galerie : AppCompatActivity() {
+    public override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        val M1 = LinearLayout(this)
-        M1.orientation = LinearLayout.VERTICAL
-        V = EditText(this)
-        val C = EditText(this)
-        V!!.setText(" ")
-        C.setText("VITESSE")
-        M1.addView(C)
-        M1.addView(V)
-        setContentView(M1)
-        mSensorManager = getSystemService(SENSOR_SERVICE) as SensorManager
-        // on recupere l accelerometre a partir du SensorManager
-        accelerometer = mSensorManager!!.getDefaultSensor(Sensor.TYPE_ACCELEROMETER)
-        // on associe l ecouteur d’ evenements au SensorManager
-        mSensorManager!!.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL)
+        val l1 = LinearLayout(this)
+        l1.orientation = LinearLayout.VERTICAL
+        val t1 = TextView(this)
+        t1.text = "Bienvenue sur 2!"
+        l1.addView(t1)
+        setContentView(l1)
     }
-
-    override fun onAccuracyChanged(
-        sensor: Sensor,
-        accuracy: Int
-    ) { // TODO Auto−generated method stub
-    }
-
-    override fun onSensorChanged(event: SensorEvent) { // TODO Auto−generated method stub
-        val gammaX = event.values[0]
-        val gammaY = event.values[1]
-        val gammaZ = event.values[2]
-        Log.d("Valeurs accelerometre", "$gammaX,$gammaY,$gammaZ")
-        V!!.setText(gammaX.toString())
-    }
-}
\ No newline at end of file
+}