解決方法：繼承EditText類，覆寫onCreateInputConnection方法，如下：
@Override
public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
InputConnection inputConnection = super.onCreateInputConnection(outAttrs);
if(inputConnection != null){
outAttrs.imeOptions &= ~EditorInfo.IME_FLAG_NO_ENTER_ACTION;
}
return inputConnection;
}
