How do I fix this error in Android Studio?

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I've been getting this error every now and then, and once I thought it was fixed, it just came back:

Error while executing: am start -n "com.example.wolfixfinal/com.example.wolfixfinal.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.wolfixfinal/.MainActivity }
Error type 3
Error: Activity class {com.example.wolfixfinal/com.example.wolfixfinal.MainActivity} does not exist.

Error while Launching activity
Failed to launch an application on all devices

I've made two or three other questions about this topic and it's getting annoying. I've tried removing the gradle and .gradle folder, removing the .idea folder and then rebuilding the project. I don't know what to do anymore.

How do I keep this from not happening, is it something I have to do all the time everytime I see this error.

kotlin android-studio android
1 Answers

Make sure than only ONE of your activities has the LAUNCHER and MAIN properties in your Manifest file. This file can be found under Android Project view: app > manifests > AndroidManifest.xml. The one you want to boot in is the one that should have these properties.

Like this:

<activity
        android:name=".Splash"
        android:exported="true">

        <!--This will be the starting activity you want-->
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".MainActivity"
        android:exported="true"/>

NOT like this (2 activities in the manifest both have:

<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />

):

<activity
        android:name=".Splash"
        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=".MainActivity"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
user_160208510
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