Android app won't open after i install. But it can run in emulator

Question

I have exported my app from eclipse and installed it on my phone. After installation, I click open from package installer, but the installer force close. Afterwards, when I tried to launch the app, nothing happen after I click it. I click the app in app drawer but it return to home screen instead.

I am able to run in emulator and in debug mode when I connect my device via usb, but not when I export the apk to install.

Note that this is not the first app that I exported to install. Previous apps are working fine.

Answer 1

I found the problem! I had declared the activity 2 times in the manifest with different properties, like:

<activity android:name=".myclass"></activity> 

and

<activity android:name=".myclass" android:label="@string/app_name">
  <intent-filter>   
     <action android:name="android.intent.action.MAIN" /> 
     <category android:name="android.intent.category.LAUNCHER" /> 
  </intent-filter>
</activity> 

Remove the unwanted one from the manifest and it will work.

Answer 2

Check your android emulator version and the firmware version of the phone. If firmware version is not supported for that app you will be install from adb, but you cant start the app.

Check the settings to be able to install the unknown apps in
Settings->Applications and check box "Unknown Sources"