java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{}: java.lang.ClassNotFoundException

Question

I am trying to build a HelloWorld android app using cordova. I am following footsteps mentioned on follwoing page http://javaonlineguide.net/2015/06/apache-cordova-hello-world-program-for-android-platform-in-eclipse-example.html

I've been browsing the issue and I'm pretty sure I'm not having the same issues as mentioned. Both of my activities are declared in the AndroidManifest and the intent filter is there. I tried replacing in my Manifest com.example.main.MainActivity by .MainActivity but still no luck. I'm using Eclipse IDE In Java build path-> Order and Export Android Private Libraries is checked

I have tried building and cleaning project again and again. I even tried restarting Eclipse.

Project Explorer

Here is Logcat:

07-14 06:07:36.169: E/AndroidRuntime(1133): FATAL EXCEPTION: main
07-14 06:07:36.169: E/AndroidRuntime(1133): Process: com.example.main, PID: 1133
07-14 06:07:36.169: E/AndroidRuntime(1133): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.main/com.example.main.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.example.main.MainActivity" on path: DexPathList[[zip file "/data/app/com.example.main-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.main-1, /system/lib]]
07-14 06:07:36.169: E/AndroidRuntime(1133): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2110)
07-14 06:07:36.169: E/AndroidRuntime(1133): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
07-14 06:07:36.169: E/AndroidRuntime(1133): at android.app.ActivityThread.access$800(ActivityThread.java:135)
07-14 06:07:36.169: E/AndroidRuntime(1133): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
07-14 06:07:36.169: E/AndroidRuntime(1133): at android.os.Handler.dispatchMessage(Handler.java:102)
07-14 06:07:36.169: E/AndroidRuntime(1133): at android.os.Looper.loop(Looper.java:136)
07-14 06:07:36.169: E/AndroidRuntime(1133): at android.app.ActivityThread.main(ActivityThread.java:5001)
07-14 06:07:36.169: E/AndroidRuntime(1133): at java.lang.reflect.Method.invokeNative(Native Method)
07-14 06:07:36.169: E/AndroidRuntime(1133): at java.lang.reflect.Method.invoke(Method.java:515)
07-14 06:07:36.169: E/AndroidRuntime(1133): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
07-14 06:07:36.169: E/AndroidRuntime(1133): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
07-14 06:07:36.169: E/AndroidRuntime(1133): at dalvik.system.NativeStart.main(Native Method)
07-14 06:07:36.169: E/AndroidRuntime(1133): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.main.MainActivity" on path: DexPathList[[zip file "/data/app/com.example.main-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.main-1, /system/lib]]
07-14 06:07:36.169: E/AndroidRuntime(1133): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
07-14 06:07:36.169: E/AndroidRuntime(1133): at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
07-14 06:07:36.169: E/AndroidRuntime(1133): at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
07-14 06:07:36.169: E/AndroidRuntime(1133): at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
07-14 06:07:36.169: E/AndroidRuntime(1133): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2101)

Here is AndroidManifest.xml :

<?xml version='1.0' encoding='utf-8'?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.main"
android:hardwareAccelerated="true"
android:versionCode="1"
android:versionName="0.0.1" >

<supports-screens
    android:anyDensity="true"
    android:largeScreens="true"
    android:normalScreens="true"
    android:resizeable="true"
    android:smallScreens="true"
    android:xlargeScreens="true" />

<uses-permission android:name="android.permission.INTERNET" />

<application
    android:hardwareAccelerated="true"
    android:icon="@drawable/icon"
    android:label="@string/app_name"
    android:supportsRtl="true" >
    <activity
        android:name="MainActivity"
           android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale"
        android:label="@string/activity_name"
        android:launchMode="singleTop"
        android:theme="@android:style/Theme.DeviceDefault.NoActionBar"
        android:windowSoftInputMode="adjustResize" >
        <intent-filter android:label="@string/launcher_name" >
            <action android:name="android.intent.action.MAIN" />

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

<uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="23" />

</manifest>

Here is MainActivity.java

package com.example.main;

import android.os.Bundle;
import org.apache.cordova.*;

public class MainActivity extends CordovaActivity
{
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        // Set by <content src="index.html" /> in config.xml
        loadUrl(launchUrl);
    }
}

Answer 1

In your manifest, do this if the name is already '.MainActivity' and still showing error.

Eg :

<activity
            android:name="com.pakgename.MainActivity"
            ...
</activity>

Answer 2

I have stopped the Instant run from Android studio and its working.

File->Setting->Build->Instant Run->Disble checkbox of Enable instant run to hotswap code/resource changes

Answer 3

I restarted my device and it just worked!

Answer 4

All I needed to do was build application using Cordova.

I was building project in Eclipse but with that I also needed to build project using command :

E:\Software\Demo\VMSapp>cordova build

This command updates APK file.

Answer 5

because you are declare this way

  <activity
        android:name="MainActivity"

just put . to MainActivity like this

 <activity
            android:name=".MainActivity"

Answer 6

In your manifest, in your activity tag, add a '.' before MainActivity

`android:name=".MainActivity"`

You can consider android.name as a continuation of package name. So, without the dot it would be com.example.mainMainActivity which is wrong. The correct structure would be com.example.main.MainActivity