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並前往https://books.google.com.tw/books?id=2xhKDwAAQBAJ&pg=PA144&lpg=PA144&dq=onvisibilitychange&source=bl&ots=vmv75PPaaT&sig=ACfU3U14VsAIxfIJmyChGdevrJ3WnJJO-g&hl=zh-TW&sa=X&ved=2ahUKEwjKqrPJsrr0AhWRCqYKHaWQDLEQ6AF6BQikAhAD

Building Android UIs with Custom Views: Build amazing custom ...

Also, as we've implemented the onVisibilityChange callback on our previous example, let's take advantage of it: } if ((previousVisibility == View.

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