[Solved] My program crashes and I don’t know why

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I assume (It would be better if you post the crash log along with your question, so that we can help you better and stop assuming) you are getting a null pointer exception on the following code:

i.putExtra("temper", temp.getText().toString());

In your code you declared temp, but it is never initialised. You need to initialise temp before using it.

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solved My program crashes and I don’t know why