我只想在特定路线上将主题更改为import java.util.Scanner;
import java.util.concurrent.ThreadLocalRandom;
import java.util.Calendar;
import java.util.Date;
// How to create a Jumble word game in Java
public class MyProgram {
private static final String[] WORDS_DATABASE = new String[] {
"code","kids","baby", "dosa", "beach","house","apple", "paper",
"Java", "school", "science", "Oracle", "Disney", "cricket", "carrot",
"vada"
};
private static String[] hints = new String[] {
"Programs are made of ___", "Synonym for children", "Synonym for infant",
"Idli, vada, and ___", "This place is next to ocean", "Other word for 'home'",
"This is a red color fruit", "pencil and ____", "programming language",
"place for education", "Physics, chemistry, biology are all ____",
"Larry Ellison founded this company", "the ____ princesses", "Famous sport with bat and ball",
"What rabbits eat", "idli and ___"
};
public static void main(String[] args) {
MyProgram jg = new MyProgram();
jg.startGame();
}
/**
* Run a game of Jumble in Java. The steps in the game are,
* 1. Get a random word from the words database
* 2. Shuffle/jumble the word by randomly shuffling characters
* 3. Present the jumbled word to the user and ask him to guess the word.
* 4. Repeat the guess till answer is found or user decides to quit.
*/
private void startGame() {
// int numberOfGuesses = 0;
// String original = selectRandomWord();
//String shuffled = getShuffledWord(original);
boolean gameOn = true;
while(gameOn) {
int numberOfGuesses = 0;
String original = selectRandomWord();
String shuffled = getShuffledWord(original);
System.out.println("Shuffled word is: "+shuffled);
numberOfGuesses++;
String userGuess = getUserGuess();
if(original.equalsIgnoreCase(userGuess)) {
System.out.println("Congratulations! You found the word in "+numberOfGuesses+" guesses");
System.out.println("");
//gameOn = false;
}else {
System.out.println("Sorry, Wrong answer");
System.out.println("--------");
if (numberOfGuesses > 0){
displayHint(original);
System.out.println("");
// String userGuess = getUserGuess();
}
}
}
}
/**
* Get the user's word guess from command line
* @return
*/
public String getUserGuess() {
Scanner sn = new Scanner(System.in);
System.out.println("Please type in the original word: ");
return sn.nextLine();
}
/**
* Select a random word from the WORDS_DATABASE array.
* @return
*/
public String selectRandomWord() {
int rPos = ThreadLocalRandom.current().nextInt(0, WORDS_DATABASE.length);
return WORDS_DATABASE[rPos];
}
/**
* Shuffle the original word by randomly swapping characters 10 times
* @param original
* @return
*/
public String getShuffledWord(String original) {
String shuffledWord = original; // start with original
int wordSize = original.length();
int shuffleCount = 10; // let us randomly shuffle letters 10 times
for(int i=0;i<shuffleCount;i++) {
//swap letters in two indexes
int position1 = ThreadLocalRandom.current().nextInt(0, wordSize);
int position2 = ThreadLocalRandom.current().nextInt(0, wordSize);
shuffledWord = swapCharacters(shuffledWord,position1,position2);
}
return shuffledWord;
}
/**
* Swaps characters in a string using the given character positions
* @param shuffledWord
* @param position1
* @param position2
* @return
*/
private String swapCharacters(String shuffledWord, int position1, int position2) {
char[] charArray = shuffledWord.toCharArray();
// Replace with a "swap" function, if desired:
char temp = charArray[position1];
charArray[position1] = charArray[position2];
charArray[position2] = temp;
return new String(charArray);
}
private void displayHint(String s){
for (int i = 0; i < WORDS_DATABASE.length; i++){
if (WORDS_DATABASE[i].equals(s)){
System.out.println("HINT:" + hints[i]);
}
}
}
}
。为此，我使用了redTheme之类的
routingCallback不幸的是，这是造成的
════════小部件库捕获到异常 ══════════════════════════════════════════════════ ═════setState（）或 在构建过程中调用markNeedsBuild（）。相关的引起错误 小部件是：方向性 文件：///Users/jakub/.pub-cache/hosted/pub.dartlang.org/get_navigation-3.12.0/lib/src/root/root_widget.dart：235：22 ══════════════════════════════════════════════════ ══════════════════════════════════════════════════
因此，我将主题更改包装在try-catch块中，因此一开始我没有遇到异常
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return GetMaterialApp(
title: 'App',
theme: defaultTheme(context),
initialRoute: AppPages.INITIAL,
getPages: AppPages.routes,
routingCallback: (routing) => _routingCallback(context, routing),
);
}
_routingCallback(BuildContext context, Routing routing) {
if (routing.current == Routes.PURSUE_MODE) {
_changeThemeIfNeeded(redTheme(context));
} else {
_changeThemeIfNeeded(defaultTheme(context));
}
}
void _changeThemeIfNeeded(ThemeData theme) {
Get.changeTheme(theme);
}
}
但是我相信使用 void _changeThemeIfNeeded(ThemeData theme) {
try {
if (Get.theme != theme) {
Get.changeTheme(theme);
}
} catch (e) {
print('Not ready e = $e');
}
}
框架可以更优雅地解决这个问题？
答案 0 :(得分：1)
我对GetX并不是很熟悉。但是，为了避免出现setState() or markNeedsBuild() called during build.错误，可以在这种情况下使用addPostFrameCallback，如下所示：
routingCallback: (routing) => WidgetsBinding.instance
.addPostFrameCallback((_) => _routingCallback(context, routing))