Q:

My android app can't be installed in my device

I developed an android app containing tts engine. After all I succeeded in running the app via emulator. But when I tried to install it in real device, I am getting a message like 'Application not installed'. Does anybody knows the problem, please suggest me

A:

Check your Logcat.  My guess is that the key you used to sign the app you are installing doesn't match the one on your device.  This would happen if you are signing using a debug key for testing, and are trying to install over the app (having the same package name) that was signed with your production key.
Type: adb logcat from the command line to discover your exact error.

