Typing in Chinese
To type in Chinese, you can use the Pinyin, Cangjie, Strokes (Wubihua), or Zhuyin (BoPoMoFo) input methods.
All input methods support word prediction. The prediction bar appears above the keyboard, and you can swipe from right to left on the prediction bar to scroll through predictions.
When typing in Pinyin on a non-Chinese keyboard, you can use the phonetic sound of a character to get Chinese diacritics to appear as word predictions.
If you're using the Cangjie input method and your device has a physical keyboard, the following image shows how the characters map to the physical keys: