1、进入flutter的services目录
cd flutter/packages/flutter/lib/src/services


2、修改text_input.dart文件的TextInputConnection类的show方法,将以下代码注释掉
SystemChannels.textInput.invokeMethod<void>('TextInput.show');

  /// Requests that the text input control become visible.
  void show() {
    assert(attached);
    // SystemChannels.textInput.invokeMethod<void>('TextInput.show');
  }

3、重新编译下工程即可