I have a kotlin/xml file in android studio. I want to use an image button to go to my activity image display screen but whenever I select the location and destination and then click the navigate button the app stops working
The error
Process: com.example.collegeroamer, PID: 10761
android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.collegeroamer/com.example.collegeroamer.NavigationDisplayActivity}; have you declared this activity in your AndroidManifest.xml?
at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:2065)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1727)
at android.app.Activity.startActivityForResult(Activity.java:5320)
at androidx.activity.ComponentActivity.startActivityForResult(ComponentActivity.java:728)
at android.app.Activity.startActivityForResult(Activity.java:5278)
at androidx.activity.ComponentActivity.startActivityForResult(ComponentActivity.java:709)
at android.app.Activity.startActivity(Activity.java:5664)
at android.app.Activity.startActivity(Activity.java:5617)
at com.example.collegeroamer.MainActivity.onCreate$lambda$0(MainActivity.kt:26)
at com.example.collegeroamer.MainActivity.$r8$lambda$v-UY7dqHrHnhJePGV2sXZapuvnU(Unknown Source:0)
at com.example.collegeroamer.MainActivity$$ExternalSyntheticLambda0.onClick(Unknown Source:2)
at android.view.View.performClick(View.java:7448)
at android.view.View.performClickInternal(View.java:7425)
at android.view.View.access$3600(View.java:810)
at android.view.View$PerformClick.run(View.java:28305)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
My codes
Android Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<application
android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.CollegeRoamer"
tools:targetApi="31">
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
MainActivity.kt
package com.example.collegeroamer
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.ImageButton
import android.widget.Spinner
class MainActivity : AppCompatActivity() {
private lateinit var navigateButton: ImageButton
private lateinit var currentLocationSpinner: Spinner
private lateinit var destinationSpinner: Spinner
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
navigateButton = findViewById(R.id.navigateButton)
currentLocationSpinner = findViewById(R.id.currentLocationSpinner)
destinationSpinner = findViewById(R.id.destinationSpinner)
navigateButton.setOnClickListener {
val selectedLocation = currentLocationSpinner.selectedItem.toString()
val intent = Intent(this, NavigationDisplayActivity::class.java)
intent.putExtra("selected_location", selectedLocation)
startActivity(intent)
}
}
}
NavigationDisplayActivity.kt
@file:Suppress("UNUSED_EXPRESSION")
package com.example.collegeroamer
import android.os.Bundle
import android.widget.ImageView
import androidx.appcompat.app.AppCompatActivity
class NavigationDisplayActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_image_display)
val locationImage = findViewById<ImageView>(R.id.locationImage)
val selectedLocation = intent.getStringExtra("selected_location")
val imageResourceId = getImageResourceIdForLocation(selectedLocation ?: "")
locationImage.setImageResource(imageResourceId)
}
private fun getImageResourceIdForLocation(location: String): Int {
return when (location) {
else -> R.drawable.default_image
}
}
}
You should declare the NavigationDisplayActivity in the AndroidManifest.xml as below.
<application
...
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".NavigationDisplayActivity" >
</activity>
</application>