showInputMethodPicker 在 Marshmallow 以上的设备上不起作用？

Question

In the documentation, I saw that

showInputMethodPicker Added in API level 3 public void showInputMethodPicker () Show IME picker popup window.

Requires the PackageManager#FEATURE_INPUT_METHODS feature which can be detected using PackageManager#hasSystemFeature(String).

I don't know how to add `FEATURE_INPUT_METHODS to enable the choose keyboard popup.

Answer 1

System features are set by device manufacturers, based on the device capabilities. An app does not add them.

The statement in the documentation about FEATURE_INPUT_METHODS is so that you can detect if the device that your app runs on supports input methods, so you know whether it makes sense to call showInputMethodPicker() or not.