Why my android app is not working.? Why my android app crashes.?

Hello friends,

Here I am going to discuss what are the general and mistakes people do or they forget while making an android app.

Reason app do not open or crashes in between

1.Do not include permission in Android.manifest

2.Do not add activity in Android.manifest

3.xml file id to element is not mapped or connect to UI

4.Calling of a function that goes into a loop

5.Calling of a function directly in onCreate()

6.Xml file is not connected

There are many others error due to minor mistakes.

Try to avoid all these silly mistakes.