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

Issue

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);
    }
}

Solution

because you are declare this way

  <activity
        android:name="MainActivity"

just put . to MainActivity like this

 <activity
            android:name=".MainActivity"

Answered By - Harshad Pansuriya