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

Question

Ok guys this doesn\'t make sense to me at all and I don\'t understand why I am getting this error in my app. I have registered the activity class in the android manifrest xm

Answer 1

I got this problem and fix it by moving all .jar files (external library files) which put in "lib" folder to "libs" folder. Somehow, eclipse only know .jar files put in libs folder

Answer 2

You have put 3rd party library in library folder and reference them. Go to Properties/ Java Build Path/ Libraries/ Add External JARs.

Check the Jar files in the Properties/ Java Build Path/ Order and Export

Answer 3

Right click on your Battery class > BuildPath > Exclude Then Right click on your Battery class > BuildPath > Include your class again

Answer 4

you can just remove the app from your mobile phone or your emulator

Answer 5

See the crash log carefully:

loader dalvik.system.PathClassLoader[/mnt/asec/com.mobile.batteryhelper-1/pkg.apk

Here mnt means external SD card.

Normally, when android:installLocation="auto" is set in AndroidManifest.xml, if the device won't have enough phone memory, then the app will be stored on the SD card. Once you remove the SD card from the device, the app can't find the APK location, then the app crashes.

Steps to produce the crash:

Issue able to replicate in HTC sensation 2.3.4 version.

• Move the app to SD Card by going to Settings-->Manage applications->Click on the app-->Move to SD card
• Remove the SD card from the device and open the app

If you try with a Samsung device, it won't crash, but it won't show the app if you remove the SD Card. This behaviour is for a few devices only.

Answer 6

Actually I found my answer to this same issue here: java.lang.ClassNotFoundException on working app

You don't provide a name for the Application tag, only the Activity. So if your issue was the same as mine, you should be able to remove the following and things will work:

android:name=".Battery"