基本上，我们的任务是创造一个tic-tac-toe +1游戏，你可以通过连续三个获胜，一个在上面或下面（如果你有3个连续水平），或者在一边您的行（如果您连续3行）。我知道我的胜利条件检查有问题，只是不确定是什么，如果我现在点击任何按钮它会立即崩溃。这是我的Java，
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
// Tic-Tac-Toe plus 1
// This version of Tic-Tac-Toe has a 4x4 grid
// In order to win, a player must make a 3x2 "L"
// on the first or last element
// Example 1: X would win horizontal + 1
// XXXO
// O XO
// X X
// O O
//
// Example 2: X would win horizontal + 1
// XXXO
// X OO
// O X
// X O
//
// Example 3: X would win vertically + 1
// XOXO
// X OO
// XX X
// O
//
// Example 4: X would win
// XOXO
// O XO
// OXX
// X O
//
// *** IMPORTANT ***
// make sure that you replace the line below with YOUR package statement
// Make sure to use your class name (public class YourClassName)
public class tttone extends AppCompatActivity {
// declare variables to reference any UI objects that you need to access
Button[][] board = new Button[4][4];
TextView winLoseTextView;
// declare instance variables
String whosTurn;
String winLoseText;
boolean gameOver = false;
// Called when the activity is first created.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tttone);
setTitle("Tic Tac Toe");
whosTurn = "X";
winLoseTextView = (TextView) findViewById(R.id.winlosetextview);
board[0][0] = (Button) findViewById(R.id.button00);
board[0][1] = (Button) findViewById(R.id.button01);
board[0][2] = (Button) findViewById(R.id.button02);
board[0][3] = (Button) findViewById(R.id.button03);
board[1][0] = (Button) findViewById(R.id.button10);
board[1][1] = (Button) findViewById(R.id.button11);
board[1][2] = (Button) findViewById(R.id.button12);
board[1][3] = (Button) findViewById(R.id.button13);
board[2][0] = (Button) findViewById(R.id.button20);
board[2][1] = (Button) findViewById(R.id.button21);
board[2][2] = (Button) findViewById(R.id.button22);
board[2][3] = (Button) findViewById(R.id.button23);
board[3][0] = (Button) findViewById(R.id.button30);
board[3][1] = (Button) findViewById(R.id.button31);
board[3][2] = (Button) findViewById(R.id.button32);
board[3][3] = (Button) findViewById(R.id.button33);
// FINISH ME
// add more of these
whosTurn = "X";
// FINISH ME
// add variable for winlose text
winLoseText = "";
}
public void buttonClick(View v) {
if (gameOver) {
return;
} else {
for (int r = 0; r < 4; r++) {
for (int c = 0; c < 4; c++) {
if (v == board[r][c]) {
if (board[r][c].getText().equals(" ")) {
board[r][c].setText(whosTurn);
if (whosTurn.equals("X")) {
whosTurn = "O";
winLoseTextView.setText(isWinner("X"));
winLoseTextView.setVisibility(View.VISIBLE);
} else {
whosTurn = "X";
winLoseTextView.setText(isWinner("O"));
winLoseTextView.setVisibility(View.VISIBLE);
}
}
}
}
}
}
}
// FINISH ME
// use double for loops to loop through the all the rows and columns of the board
// determine which button was clicked by using if (v == board[#][#])
// make sure the button that was clicked is empty (i.e. it's text == " ")
// set the button text to the correct character
// determine if there is a winner or not
public boolean isValid(int r, int c) {
// FINISH ME
// return true if (r,c) is on the board else return false
if (r >= 0 && r <= 3 && c <= 3 && r >= 0) {
return true;
}
else {
return false;
}
}
public boolean isPlayer(String player, int r, int c)
{
if (!isValid(r,c))
return false;
// FINISH ME
// return true if this player is in the (r,c) position else return false
if (board[r][c].getText().toString().equals(player)){
return true;
}
else {
return false;
}
}
public boolean isPlayerAbove(String player, int r, int c) {
// FINISH ME
// return true if this player is in the (r,c) position else return false
if (isValid(r - 1, c)){
if (board[r - 1][c].getText().toString().equals(player)) {
return true;
} else {
return false;
}
}
return false;
}
public boolean isPlayerBelow(String player, int r, int c)
{
// FINISH ME
// return true if this player is in the (r,c) position else return false
if (isValid(r+1,c)) {
if (board[r + 1][c].getText().toString().equals(player)) {
return true;
} else {
return false;
}
}
return false;
}
public boolean isPlayerRight(String player, int r, int c) {
// FINISH ME
// return true if this player is in the (r,c) position else return false
if (isValid(r, c + 1)) {
if (board[r][c + 1].getText().toString().equals(player)) {
return true;
} else {
return false;
}
}
return false;
}
public boolean isPlayerLeft(String player, int r, int c)
{
// FINISH ME
// return true if this player is in the (r,c) position else return false
if (isValid(r,c-1)) {
if (board[r][c - 1].getText().toString().equals(player)) {
return true;
} else {
return false;
}
}
return false;
}
public boolean is3InARowHorizontal(String player, int r, int c)
// FINISH ME
// return true if player appears in positions (r,c) (r,c+1) and (r,c+2)
// else return false
{
if ((board[r][c].getText().toString().equals(player))&&(board[r][c+1].getText().toString().equals(player))&&(board[r][c+2].getText().toString().equals(player)) ){
return true;
}
else {
return false;
}
}
public boolean is3InARowVertical(String player, int r, int c)
// FINISH ME
// return true if player appears in positions (r,c) (r+1,c) and (r+2,c)
// else return false
{
if ((board[r][c].getText().toString().equals(player))&&(board[r+1][c].getText().toString().equals(player))&&(board[r+2][c].getText().toString().equals(player)) ){
return true;
}
else {
return false;
}
}
public String isWinner(String player)
{
// FINISH ME
// you should look for 3 (yes 3) in a row anywhere on the board (horizontal, vertical, but NO diagonals)
// PLUS one more up or down (or left or right) on the first or last element
// That is in order to win, a player must make a 3x2 "L" horizontally or vertically.
// this method should return the empty String if there is no winner or cat's game
//
// YOU MUST CALL METHODS ABOVE IN YOUR SOLUTION
// return "X Wins Horizontal", or "O Wins Horizontal", or
// "X Wins Vertical", or "O Wins Vertical" or
// "" if there are no winners (yet)
// FINISH ME
// check for vertical win
for (int r = 0; r < 4; r++){
for (int c = 0; c <4; c++){
if ((is3InARowVertical(player, r, c))&&((isPlayerRight(player,r, c)))||((isPlayerLeft(player,r, c)))||((isPlayerLeft(player,r+2, c)))||((isPlayerRight(player,r+2, c)))){
winLoseText = player + " wins vertical";
}
}
}
for (int r = 0; r < 4; r++){
for (int c = 0; c <4; c++){
if ((is3InARowHorizontal(player, r, c))&&((isPlayerAbove(player,r, c)))||((isPlayerBelow(player,r, c)))||((isPlayerLeft(player,r+2, c)))||((isPlayerRight(player,r+2, c)))){
winLoseText = player + " wins horizontal";
}
}
}
winLoseText = "meme";
// FINISH ME
// check for horizontal win
return winLoseText;
}
public void clearBoard() {
for (int r = 0; r < 4; r++) {
for (int c = 0; c < 4; c++) {
board[r][c].setText(" ");
}
}
}
// FINISH ME
// use two loops to set the Button objects to " "
public void newGameClick(View v)
{
clearBoard();// FINISH ME
whosTurn = "X";
winLoseText = "";
// call clearBoard() and do any other initialization
// set whosTurn = 'X'
// clear the message field
}
}
任何帮助表示赞赏！ 这是错误日志
04-09 19:27:26.197 2390-2390/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.owner.tttone, PID: 2390
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ArrayIndexOutOfBoundsException: length=4; index=-1
at com.example.owner.tttone.tttone.isPlayerLeft(tttone.java:197)
at com.example.owner.tttone.tttone.isWinner(tttone.java:257)
at com.example.owner.tttone.tttone.buttonClick(tttone.java:98)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
04-09 19:27:26.197 1678-1812/system_process W/ActivityManager: Force finishing activity com.example.owner.tttone/.tttone
答案 0 :(得分：0)
你在isValid（int r，int c）函数的if条件中输入了一个拼写错误，试试这个：
public boolean isValid(int r, int c) {
// FINISH ME
// return true if (r,c) is on the board else return false
// CHANGED'r >= 0' to 'c >= 0'
if (r >= 0 && r <= 3 && c <= 3 && c >= 0) {
return true;
}
else {
return false;
}
}