我正在制作一个Hangman游戏。游戏正在运行，除了当我开始新游戏时，我无法清除上一个游戏中存储的数据。因此，在用户点击“再次播放”后，它会给我一个如下所示的屏幕。
Screenshot of Hangman Game - How it should look after clicking "play again"
Screenshot of Hangman Game after clicking "play again"
如何重置数据以便执行startNewGame方法后的textview和按钮？
尝试使用textView.setText（“”）进行重置，但它无法正常工作。感谢您是否可以为我提供一些帮助。谢谢！
我的代码如下。
package com.desmondwong.hangmangame;
import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.GridLayout;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ViewSwitcher;
import java.util.Random;
public class GameActivity extends AppCompatActivity {
//To reference the components
ImageSwitcher imageSwitcher;
TextView textView;
TextView textViewScore;
Button btn [] = new Button[26];
//Images for the hangman
int img [] = {R.drawable.img0,
R.drawable.img1,
R.drawable.img2,
R.drawable.img3,
R.drawable.img4,
R.drawable.img5,
R.drawable.img6,
R.drawable.img7,
R.drawable.img8};
AlertDialog helpAlert;
//Variables
String strSecret = "", strGuess="", strText="";
String strWords[] = {"APPLE", "ORANGE","BANANA"};
int intError = 0; //Error made by player
int livesRemaining = 8; //Lives remaining by player
int numCorr = 0; //Correct letter guess by player
Random random = new Random(); //Random generator
public void startNewGame(){
intError = 0; //Error made by player
livesRemaining = 8; //Lives remaining by player
numCorr = 0; //Correct letter guess by player
imageSwitcher.removeAllViews();
//textViewScore.setText(String.valueOf(livesRemaining));
//textView.setText("");
setupImageSwitcher();
setup26Buttons();
getSecretWord();
}
//To create help icon at top right
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
//To create help icon at top right
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
//case android.R.id.home:
// NavUtils.navigateUpFromSameTask(this);
//return true;
case R.id.action_help:
showHelp();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
//Retrieve the reference
imageSwitcher = findViewById(R.id.imageSwitcher);
textView = findViewById(R.id.textView);
textViewScore = findViewById(R.id.textViewScore);
textViewScore.setText(String.valueOf(livesRemaining));
setupImageSwitcher();
setup26Buttons();
getSecretWord();
}
private void setup26Buttons() {
GridLayout g = findViewById(R.id.gridLayout);
//to create 26 buttons
for(int i = 0; i<btn.length; i++) {
btn[i] = new Button(this, null, R.attr.buttonStyleSmall); //Buttonsytlesmall so that it fits the screen
btn[i].setText(""+(char)('A'+i)); //need to set back to char, as +i will set it back to integer. "" to set this to a String so it is sync to setText
btn[i].setTag(""+(char)('A'+i));
btn[i].setOnClickListener(new View.OnClickListener() {
@SuppressLint("ResourceAsColor")
@Override
public void onClick(View v) {
strGuess += v.getTag(); //Get letter that the player guessed and keep adding on to strGuess
v.setEnabled(false); //disable pressed button since the player already press
v.setBackgroundColor(android.R.color.black);
//Check for error guess. If the letter is not inside the strSecret, it will return less than 0
if (strSecret.indexOf(v.getTag().toString())<0){
intError++; //your error is added
int livesRemaining = 8;
livesRemaining -= intError; // Countdown based on errors recorded
textViewScore.setText(String.valueOf(livesRemaining));
imageSwitcher.setImageResource(img[intError]); //set the img no. to follow the error
}
else {
numCorr++;
}
boolean playerWin = true;
//Display all correct guesses
strText = ""; //reset the display
for (int i = 0 ; i<strSecret.length();i++){
char ch = strSecret.charAt(i); // get each character from strSecret
//To check if this letter can be found in strGuess
if(strGuess.indexOf(ch)>=0){
//found
strText += ch;
}
else{
//Not found
strText += "-";
playerWin=false;
}
}
textView.setText(strText);
if (playerWin) {
if (numCorr == strSecret.length()) {
//Toast.makeText(getApplicationContext(), "You won", Toast.LENGTH_LONG).show();
//let user know they have won, ask if they want to play again
AlertDialog.Builder winBuild = new AlertDialog.Builder(GameActivity.this);
winBuild.setTitle("Amazing! You save Batman!");
winBuild.setMessage("The Hangman\'s favourite fruit is:\n\n" + strSecret);
winBuild.setPositiveButton("Play Again",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
GameActivity.this.startNewGame();
}
});
winBuild.setNegativeButton("Exit",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
GameActivity.this.finish();
}
});
winBuild.show();
}
} else if (livesRemaining > 0) {
//still have lives remaining. do nothing
}
else {
//Toast.makeText(getApplicationContext(), "You Lost",Toast.LENGTH_LONG).show();
// Display Alert Dialog
AlertDialog.Builder loseBuild = new AlertDialog.Builder(GameActivity.this);
loseBuild.setTitle("Batman got executed!");
loseBuild.setMessage("You lose!\n\nThe answer was:\n\n"+ strSecret);
loseBuild.setPositiveButton("Play Again",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
GameActivity.this.startNewGame();
}});
loseBuild.setNegativeButton("Exit",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
GameActivity.this.finish();
}});
loseBuild.show();
}
}
});
g.addView(btn[i]);
}
}
private void getSecretWord() {
int index = random.nextInt(strWords.length);
strSecret = strWords[index];
for(int i=0; i<strSecret.length(); i++) {
strText += "-"; //to create multiple - for the unknown word
}
textView.setText(strText);
}
private void setupImageSwitcher() {
//https://www.tutorialspoint.com/android/android_imageswitcher.htm
imageSwitcher.setFactory(new ViewSwitcher.ViewFactory() {
@Override
public View makeView() {
ImageView imageView = new ImageView(getApplicationContext());
imageView.setImageResource(R.drawable.img0);
return imageView;
}
});
Animation aniOut = AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right);
Animation aniIn = AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left);
imageSwitcher.setOutAnimation(aniOut);
imageSwitcher.setOutAnimation(aniIn);
}
//show help information
public void showHelp(){
AlertDialog.Builder helpBuild = new AlertDialog.Builder(this);
helpBuild.setTitle("Help");
helpBuild.setMessage("Whisper the password (Hangman's favourite fruit) to save Batman\n\n"
+ "You only have 8 tries!");
helpBuild.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
helpAlert.dismiss();
}});
helpAlert = helpBuild.create();
helpBuild.show();
}
}
答案 0 :(得分：0)
每次致电startNewGame时，您的问题都是：
strText的现有值，而不是设置新的btn数组中添加新按钮（不删除旧按钮）因此，您需要确保startNewGame摆脱为之前的游戏创建的所有内容，并且您不再需要。
修改
一种方法可以是拥有一个游戏＆＃39;存储所有内容的对象（strSecret，strGuess，...），而不是将它们存储在Activity中。
每次调用startNewGame时，您都会执行myGame = new Game();，以确保所有以前的数据都已消失。
编辑2
快速解决方法是：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
//Retrieve the reference
imageSwitcher = findViewById(R.id.imageSwitcher);
textView = findViewById(R.id.textView);
textViewScore = findViewById(R.id.textViewScore);
textViewScore.setText(String.valueOf(livesRemaining));
// ** QUICK FIX **
btn = new Button[26];
strText = "";
setupImageSwitcher();
setup26Buttons();
getSecretWord();
}
编辑3（工作改进示例）
MainActivity
import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.annotation.DrawableRes;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.GridLayout;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.ViewSwitcher;
import java.util.Random;
public class GameActivity extends AppCompatActivity {
// Constants
//Images for the hangman
@DrawableRes
private final static int img[] = {R.drawable.img0, // Img0 is when the player is dead
R.drawable.img1,
R.drawable.img2,
R.drawable.img3,
R.drawable.img4,
R.drawable.img5,
R.drawable.img6,
R.drawable.img7,
R.drawable.img8};
private final static String strWords[] = {"APPLE", "ORANGE", "BANANA"};
private final static Random random = new Random(); //Random generator
// To reference the components
private ImageSwitcher imageSwitcher;
private TextView textView;
private TextView textViewScore;
// Other private fields
private Game mGame;
public void startNewGame() {
mGame = new Game(img.length - 1); // The max lives is the size of the array - 1
setup26Buttons();
initSecretWord();
imageSwitcher.reset();
imageSwitcher.setImageResource(img[mGame.livesRemaining]);
textViewScore.setText(String.valueOf(mGame.livesRemaining));
textView.setText(mGame.hiddenWord);
}
//To create help icon at top right
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
//To create help icon at top right
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_help:
showHelpDialog();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
//Retrieve the reference
imageSwitcher = findViewById(R.id.imageSwitcher);
textView = findViewById(R.id.textView);
textViewScore = findViewById(R.id.textViewScore);
// Init the view components
initImageSwitcher();
// Start the game
startNewGame();
}
private void setup26Buttons() {
final GridLayout g = findViewById(R.id.gridLayout);
g.removeAllViews(); // clear the children views (if exist)
//to create 26 buttons
final int maxLetters = 26;
Button btn;
for (int i = 0; i < maxLetters; i++) {
btn = new Button(this, null, R.attr.buttonStyleSmall); //Buttonsytlesmall so that it fits the screen
btn.setText(Character.toString((char) ('A' + i))); // Set the letter
btn.setOnClickListener(listener);
g.addView(btn);
}
}
private final View.OnClickListener listener = new View.OnClickListener() {
@SuppressLint("ResourceAsColor")
@Override
public void onClick(View v) {
String guess = (((Button) v).getText()).toString();
v.setEnabled(false); //disable pressed button since the player already press
v.setBackgroundColor(android.R.color.black);
// Check if the current letter is in the secret word
if (!mGame.secretWord.contains(guess)) {
mGame.livesRemaining--; // Remove a live
imageSwitcher.setImageResource(img[mGame.livesRemaining]); //set the img no. to follow the error
textViewScore.setText(String.valueOf(mGame.livesRemaining));
if (mGame.livesRemaining == 0) {
showEndGameDialog("Batman got executed!", "You lose!\n\nThe answer was:\n\n" + mGame.secretWord);
}
} else {
mGame.correctGuess += guess; // Add the letter to the ones correctly guessed
//Display all correct guesses
final StringBuilder sb = new StringBuilder();
final char[] chars = mGame.secretWord.toCharArray();
for (int i = 0; i < mGame.secretWord.length(); i++) {
//To check if this letter can be found in correctGuess
sb.append((mGame.correctGuess.contains(Character.toString(chars[i])))
? chars[i] //found
: "-");
}
mGame.hiddenWord = sb.toString();
textView.setText(mGame.hiddenWord);
// If all the unique letters in the word have been found, it's a win
if (mGame.correctGuess.length() == mGame.maxLetters) {
showEndGameDialog("Amazing! You save Batman!", "The Hangman\'s favourite fruit is:\n\n" + mGame.secretWord);
}
}
}
};
private void showEndGameDialog(String title, String message) {
new AlertDialog.Builder(GameActivity.this)
.setTitle(title)
.setMessage(message)
.setPositiveButton("Play Again",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
GameActivity.this.startNewGame();
}
})
.setNegativeButton("Exit",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
GameActivity.this.finish();
}
})
.show();
}
private void initSecretWord() {
int index = random.nextInt(strWords.length);
String secretWord = strWords[index];
// Replace all the letters by '-' ('\p{L}' matches any letter)
String hiddenWord = secretWord.replaceAll("\\p{L}", "-");
mGame.maxLetters = countUniqueLettersInWord(secretWord);
mGame.secretWord = secretWord;
mGame.hiddenWord = hiddenWord;
}
/**
* Calculate the number of unique letter in the word
* E.g BANANA has 3 unique letters (B,A,N)
*
* @param word The word to count the unique letter in
* @return The total of unique letters
*/
private static int countUniqueLettersInWord(final String word) {
char[] chars = word.toCharArray();
int count = 0;
char curr;
boolean contains;
for (int i = 0; i < chars.length; i++) {
curr = chars[i];
// Check if the same letter exists in the visited letters (from pos 0 to current letter)
contains = false;
for (int j = 0; j < i; j++) {
if (curr == chars[j]) {
contains = true;
break; // Don't need to continue if the letter already exists.
}
}
if (!contains)
count++;
}
return count;
}
private void initImageSwitcher() {
//https://www.tutorialspoint.com/android/android_imageswitcher.htm
imageSwitcher.setFactory(new ViewSwitcher.ViewFactory() {
@Override
public View makeView() {
return new ImageView(getApplicationContext());
}
});
Animation aniOut = AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right);
Animation aniIn = AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left);
imageSwitcher.setOutAnimation(aniOut);
imageSwitcher.setOutAnimation(aniIn);
}
//show help information
public void showHelpDialog() {
new AlertDialog.Builder(this)
.setTitle("Help")
.setMessage("Whisper the password (Hangman's favourite fruit) to save Batman\n\n"
+ "You only have 8 tries!")
.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.dismiss();
}
})
.show();
}
}
游戏课
public class Game {
String secretWord, correctGuess, hiddenWord;
//Lives remaining by player
int livesRemaining;
public int maxLetters;
public Game(int lives) {
secretWord = "";
correctGuess = "";
hiddenWord = "";
livesRemaining = lives;
}
}