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I have a TabActivity with two tabs-activities — FirstActivity and SecondActivity.
How can I access to any element (for example, change TextView‘s text) on FirstActivity from SecondActivity?
You can’t access them directly. You either inherit them from the same class, and use the parent’s class methods to communicate between them, but I am recommending to use a broadcast from the sender and a broadcastreceiver on the receiver activity. You can use putExtra to transfer details with the intent.