Is there a way to replace TextView text with a String in Android Studio?

Question

本质上，我试图用从扫描二维码获得的字符串替换 TextView 元素包含的文本，以测试扫描仪是否真正工作

Answer 1

You should be able to edit the text with the setText function

public final void setText (CharSequence text)

https://developer.android.com/reference/android/widget/TextView#setText(java.lang.CharSequence)

and here's a really nice article if that doesn't work as expected (debugging you may find that the TextView has the text you want, but is not displayed on the screen yet):

https://tekeye.uk/android/examples/ui/android-app-text-not-updating