If the screen of your Android device is too small to type comfortably, you can type text in a special field directly in the keyboard and then send it to a remote app. Here is how it works:
When you tap a text field in a remote application, the onscreen keyboard pops up. Tap the text button in the top left corner of the keyboard:
A local text field appears. Start typing the text you need in this field. Once ready, tap the send button.
The text appears in the remote app.