CODEWITHSUNDEEP
androidandroid-studiokotlin
alexandre9865
alexandre9865

Reputation: 553

Error type 3 - Error: Activity class MainActivity does not exist

I've tried to re-create my project cause of this error, in emulator the error was solved, but it kept on android device. It is saying that my MainActivity does not exist.

I saw this question and tried all answers, but all failed.

Error while executing: am start -n "com.example.test/com.example.myapplication.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.test/com.example.myapplication.MainActivity }
Error type 3
Error: Activity class {com.example.test/com.example.myapplication.MainActivity} does not exist.

Error while Launching activity

Here is my AndroidManifest.xml:

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

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

    <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="com.example.myapplication.MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

This is my MainActivity, basically the Navigation Drawer template from android studio:

package com.example.myapplication

import android.content.Intent
import android.os.Bundle
import android.util.Log
import android.view.Menu
import com.google.android.material.navigation.NavigationView
import androidx.navigation.findNavController
import androidx.navigation.ui.AppBarConfiguration
import androidx.navigation.ui.navigateUp
import androidx.navigation.ui.setupActionBarWithNavController
import androidx.navigation.ui.setupWithNavController
import androidx.drawerlayout.widget.DrawerLayout
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.Toolbar

class MainActivity : AppCompatActivity() {

    private lateinit var appBarConfiguration: AppBarConfiguration

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val toolbar: Toolbar = findViewById(R.id.toolbar)
        setSupportActionBar(toolbar)

        val drawerLayout: DrawerLayout = findViewById(R.id.drawer_layout)
        val navView: NavigationView = findViewById(R.id.nav_view)
        val navController = findNavController(R.id.nav_host_fragment)
        appBarConfiguration = AppBarConfiguration(setOf(
            R.id.nav_home), drawerLayout)
        setupActionBarWithNavController(navController, appBarConfiguration)
        navView.setupWithNavController(navController)
    }

    override fun onCreateOptionsMenu(menu: Menu): Boolean {
        menuInflater.inflate(R.menu.main, menu)
        return true
    }

    override fun onSupportNavigateUp(): Boolean {
        val navController = findNavController(R.id.nav_host_fragment)
        return navController.navigateUp(appBarConfiguration) || super.onSupportNavigateUp()
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
    }
}

Upvotes: 3

Views: 11442

Answers (2)

alexandre9865
alexandre9865

Reputation: 553

It happened after I uninstalled the app directly from android device. To solve it, I ran:

adb devices -- to get the connected devices list

followed by:

adb -s device android id uninstall package.name

Then, I ran again in android device with success

Edit: to clarify the bold texts:

device android id is one of id you'll get after type adb devices. Typing it, you'll get a list of connected devices with the ids

package.name is the text on top of your kotlin/java files, after the "package", like com.yourname.appname

Upvotes: 11

ʍѳђઽ૯ท
ʍѳђઽ૯ท

Reputation: 16976

Error: Activity class {com.example.test/com.example.myapplication.MainActivity} does not exist.

Use this in your AndroidManifest.xml:

<activity
   android:name=".MainActivity"
   android:label="@string/app_name"
   android:theme="@style/AppTheme.NoActionBar">

Upvotes: 0

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