java.lang.RuntimeException: Unable to instantiate activity ComponentInfo/ ClassNotFoundException

Question

I'm develop android application and than i wanna additional new Activity i had error on my logcat

My LogCat:

04-19 12:59:17.654: D/AndroidRuntime(18135): Shutting down VM
04-19 12:59:17.654: W/dalvikvm(18135): threadid=1: thread exiting with uncaught exception (group=0x4001d878)
04-19 12:59:17.684: E/AndroidRuntime(18135): FATAL EXCEPTION: main
04-19 12:59:17.684: E/AndroidRuntime(18135): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.bvblogic.android.batterypower/com.bvblogic.android.batterypower.activities.UnlockActivity}: java.lang.ClassNotFoundException: com.bvblogic.android.batterypower.activities.UnlockActivity in loader dalvik.system.PathClassLoader[/data/app/com.bvblogic.android.batterypower-1.apk]
04-19 12:59:17.684: E/AndroidRuntime(18135):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2587)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2681)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at android.app.ActivityThread.access$2300(ActivityThread.java:125)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at android.os.Handler.dispatchMessage(Handler.java:99)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at android.os.Looper.loop(Looper.java:123)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at android.app.ActivityThread.main(ActivityThread.java:4640)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at java.lang.reflect.Method.invokeNative(Native Method)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at java.lang.reflect.Method.invoke(Method.java:521)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at dalvik.system.NativeStart.main(Native Method)
04-19 12:59:17.684: E/AndroidRuntime(18135): Caused by: java.lang.ClassNotFoundException: com.bvblogic.android.batterypower.activities.UnlockActivity in loader dalvik.system.PathClassLoader[/data/app/com.bvblogic.android.batterypower-1.apk]
04-19 12:59:17.684: E/AndroidRuntime(18135):    at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
04-19 12:59:17.684: E/AndroidRuntime(18135):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2579)
04-19 12:59:17.684: E/AndroidRuntime(18135):    ... 11 more

My manifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.bvblogic.android.batterypower"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="8" />

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.BATTERY_STATS" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.UPDATE_DEVICE_STATS" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-permission android:name="android.permission.WRITE_SETTINGS" />
    <uses-permission android:name="android.permission.HARDWARE_TEST" />
    <uses-permission android:name="android.permission.RESTART_PACKAGES" />
    <uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES" />
    <uses-permission android:name="android.permission.GET_PACKAGE_SIZE" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity android:name=".activities.UnlockActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="com.bvblogic.android.batterypower.activities.BatteryPowerTabActivity" >
        </activity>
        <activity android:name="com.bvblogic.android.batterypower.activities.MonitoringActivity" >
        </activity>
        <activity android:name="com.bvblogic.android.batterypower.activities.SettingsActivity" >
        </activity>
        <activity android:name="com.bvblogic.android.batterypower.activities.ProcessManagerActivity" >
        </activity>
        <activity
            android:name="com.bvblogic.android.batterypower.activities.DummyBrightnessActivity"
            android:excludeFromRecents="true"
            android:taskAffinity="com.bvblogic.android.batterypower.Dummy"
            android:theme="@android:style/Theme.Translucent.NoTitleBar" >
        </activity>

        <service android:name="com.bvblogic.android.batterypower.util.TurboBoost" >
        </service>
        <service android:name="com.bvblogic.android.batterypower.services.BatteryPowerService" />

        <receiver
            android:name="com.bvblogic.android.batterypower.alarm.RegistrationAlarm"
            android:process=":registration" >
        </receiver>
        <receiver
            android:name="com.bvblogic.android.batterypower.alarm.OnlinePingAlarm"
            android:process=":ping" >
        </receiver>
        <receiver
            android:name="com.bvblogic.android.batterypower.alarm.AdNotificationAlarm"
            android:process=":remote" >
        </receiver>
        <receiver
            android:name="com.bvblogic.android.batterypower.widget.MWidgetProvider"
            android:icon="@drawable/btn_remove"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>

            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/widget_provider" />
        </receiver>
    </application>

</manifest>

My Activity:

package com.bvblogic.android.batterypower.activities;

import com.bvblogic.android.batterypower.R;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class UnlockActivity extends Activity {  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.settings_auto_saving_layout);
    }
}

Then i'm assigned intent-filter to BatteryPowerTabActivity application started fine. Please help me. Thanks

score 19 · Accepted Answer · answered Oct 10 '13 at 08:37

19

When upgrading, the 'Order and Export' of the new 'Android Private Libraries' is not always checked. And the android-support-v4.jar is now in this 'Android Private Libraries' section.

To fix this, go to 'Order and Export' and check 'Android Private Libraries'. Then refresh/clean/rebuild.

After you done this 'fix' for a library project, you may need to just close and re-open any depending project, because they may not see this 'fix' immediately.

enter image description here

answered Oct 10 '13 at 08:37

codercat

22,873
9
61
85

For me it was in Order and Export: moving my /src and /gen to the top of the list #fml – jackocnr Jun 09 '14 at 23:59
After getting this problem again, I think actually it was deleting my out/ dir (in my phonegap project this was in platforms/android/out/ – jackocnr Jul 06 '14 at 23:22

score 7 · Answer 2 · answered Apr 19 '13 at 10:14

7

change your activity declaration in the manifest file into

 <activity android:name=".UnlockActivity">

or else

<activity android:name="Yourcompletepackagename.UnlockActivity">

and try

answered Apr 19 '13 at 10:14

vinoth

485
4
16

Hi, thanks for answer. But application was crash than i'm start( – a.black13 Apr 19 '13 at 10:21
what your logcat say this time – vinoth Apr 19 '13 at 10:22
make sure your all class names with the activites and services you declared in you manifest – vinoth Apr 19 '13 at 10:26
4

I address this problem 10 hours. Understand that the problem emerged after update to ADT Eclipse plugin. – a.black13 Apr 19 '13 at 10:26
All classes is declared. Problem is that i'm add new Activity (in this case UnlockActivity) – a.black13 Apr 19 '13 at 10:27

score 5 · Answer 3 · edited May 23 '17 at 12:10

5

Dude, this also happened to me when my app was already published in the marketplace. It was a total disaster. I realized it after 5 hours of already publishing it.

There was no problem by running it with the ADT. Problem was with the generated APK. So if you publish an app, test the installation of the pure APK in your test phone.

As you, I also think that problem was with the the update of my ADT, in my case v22.

The solution was to clean and build the project:

Android java.lang.RuntimeException: Unable to instantiate activity ComponentInfo

edited May 23 '17 at 12:10

Community

1
1

answered May 24 '13 at 16:39

Rowinson Gallego

850
1
9
14

I'm glad I found your solution - this was my situation exactly. I simply had to rebuild and recreate my `.apk`. – jtooker Aug 15 '15 at 02:06

score 5 · Answer 4 · answered Jun 07 '14 at 18:13

This can happen if your activity class is inside a default package. I fixed it by moving the activity class to a new package. and changing the manifest.xml

before

activity android:name=".MainActivity"

after

activity android:name="new_package.MainActivity"

score 3 · Answer 5 · answered Jun 11 '13 at 16:59

I had the same problem, but I had my activity declared in the Manifest file, with the correct name.

My problem was that I didn't have to imported a third party libraries in a "libs" folder, and I needed reference them in my proyect (Right-click, properties, Java Build Path, Libraries, Add Jar...).

About how do you declare an activity in the manifest file, is correct use .ActivityName always that activity be in the main package.

score 1 · Answer 6 · answered Dec 09 '14 at 12:54

1

I agree with what @codercat has advised you to do, but this error also comes when you are using v7 and also v13 in the same project structure for different functionalities. Therefore, i advice you to copy the v13 jar file into the libs folder (DO NOT import it as an external jar) and then check the android libraries and android dependencies. Refresh you project and then clean your project. I am sure the error you are facing will go away.

answered Dec 09 '14 at 12:54

Kaveesh Kanwal

1,753
17
16

Hi. In this project (that was developed a year ago) I don't used any compatibility libraries Thanks for your answer +1 – a.black13 Dec 09 '14 at 22:25

score 1 · Answer 7 · answered Dec 19 '14 at 11:21

1

i also having same problem and i just turn off build automatically and build my android project manually and cleaned my project that solved this error for me

answered Dec 19 '14 at 11:21

David Fetcher

21
1

Hi thanks for interest solution. Many issues can be solved by clean and rebuild project – a.black13 Dec 19 '14 at 12:14

score 0 · Answer 8 · answered Apr 19 '13 at 10:23

0

change line from

<activity android:name=".activities.UnlockActivity">

to

<activity android:name=".com.bvblogic.android.batterypower.activities.UnlockActivity
 ">

answered Apr 19 '13 at 10:23

Avinash Kumar Pankaj

1,700
2
18
27

I decided my problem. It's was simply) I'm go Project>Properties>Builders and check all checkboxes) Thanks all) – a.black13 Apr 19 '13 at 11:08

score 0 · Answer 9 · answered Apr 26 '15 at 19:51

0

Cleaning the project worked for me. You might ask me what led to the issue? LOL I tried to upgrade a project to android 5 from 4.4 and then changed my mind and tried to restore it back to kitkat, then voila! this error came up.

answered Apr 26 '15 at 19:51

Oladipo Olasemo

2,010
24
31

score 0 · Answer 10 · edited May 16 '15 at 11:20

0

you might have declared String a = edt.getText().toString(); or int 5/3 hence such errors use to come

so,
declare them in onCreate method error will resolved

edited May 16 '15 at 11:20

gsamaras

71,951
46
188
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answered May 16 '15 at 10:57

Javed Tahasildar

1

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo/ ClassNotFoundException

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