Unable to find explicit activity class have you declared this activity in your AndroidManifest.xml?

Question

I want to open next activity but having following error

android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.pc.lovequoteandcalculator/int}; have you declared this activity in your AndroidManifest.xml?

My Manifest.xml is

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.pc.lovequoteandcalculator">

<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/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".lovecalculate" />
    <activity android:name=".quoteforlove" />
    <activity android:name=".quotestoimpress"></activity>
</application>

And this is how I am starting new activity

val btn = findViewById<View>(R.id.btnlovecal) as Button btn.setOnClickListener { 
    startActivity(
            Intent(this@MainActivity,activity_lovecalculate::class.java)
        ) 
} 

Can someone point out what am I missing here?

Answer 1

You seem to calling the wrong activity with the following:

 Intent(this@MainActivity,activity_lovecalculate::class.java)

which is trying to call activity_lovecalculate activity. But you only have:

<activity android:name=".lovecalculate" />

So, try using lovecalculate with something like this:

val btn = findViewById<View>(R.id.btnlovecal) as Button btn.setOnClickListener { 
    startActivity(
            Intent(this@MainActivity, lovecalculate::class.java)
        ) 
} 

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PS: Please use a correct coding style for class name.