How to pass variable from one activity to another?

  android, android-studio, java, javascript

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I wanna make "btn_34" in [image2] to move "game39" class if user clicked "btn_21_2" in [image1]. If user didn’t click "btn_21_2", Wanna make "btn_34" to move "game30". Which thing should I add or change in these pic?

Source: Ask Javascript Questions

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