详解Flutter点击空白隐藏键盘的全局做法

 /**
   * 获取点击事件
   */
  @CallSuper
  @Override
  public boolean dispatchTouchEvent(MotionEvent ev) {
    if (ev.getAction() == MotionEvent.MotionEvent ) {
      View view = getCurrentFocus();
      if (isShouldHideKeyBord(view, ev)) {
        hideSoftInput(view.getWindowToken());
      }
    }
    return super.dispatchTouchEvent(ev);
  }

  /**
   * 判定当前是否需要隐藏
   */
  protected boolean isShouldHideKeyBord(View v, MotionEvent ev) {
    if (v != null && (v instanceof EditText)) {
      int[] l = {0, 0};
      v.getLocationInWindow(l);
      int left = l[0], top = l[1], bottom = top + v.getHeight(), right = left + v.getWidth();
      return !(ev.getX() > left && ev.getX() < right && ev.getY() > top && ev.getY() < bottom);
    }
    return false;
  }

  /**
   * 隐藏软键盘
   */
  private void hideSoftInput(IBinder token) {
    if (token != null) {
      InputMethodManager manager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
      manager.hideSoftInputFromWindow(token, InputMethodManager.HIDE_NOT_ALWAYS);
    }
  }

GestureDetector(
  behavior: HitTestBehavior.translucent,
  onTap: () {
    // 触摸收起键盘
    FocusScope.of(context).requestFocus(FocusNode());
  },
  child: *******
}

void main() {
 runApp(MyApp());
}

class MyApp extends StatelessWidget {
 @override
 Widget build(BuildContext context) {
  return MaterialApp(
   title: 'Flutter Demo',
   theme: ThemeData(
    primarySwatch: Colors.blue,
    visualDensity: VisualDensity.adaptivePlatformDensity,
   ),
   builder: (context, child) => Scaffold(
    // Global GestureDetector that will dismiss the keyboard
    body: GestureDetector(
     onTap: () {
     hideKeyboard(context);
     },
     child: child,
    ),
   ),
   home: MyHomePage(title: 'Flutter Demo Home Page'),
  );
 }

 void hideKeyboard(BuildContext context) {
  FocusScopeNode currentFocus = FocusScope.of(context);
  if (!currentFocus.hasPrimaryFocus && currentFocus.focusedChild != null) {
   FocusManager.instance.primaryFocus.unfocus();
  }
 }
}

SystemChannels.textInput.invokeMethod（'TextInput.hide'）;