I am new to android and I'm having trouble figuring out how to properly code saving a current game to continue where I left off due to an orientation switch or pressing the home button and returning to the app. I have read about preferences and onSaveInstanceState but, I am having a tough time setting it up properly to work with my Tic-Tac-Toe application. Can someone please help me set this up and explain the process? Thanks in advance.
public class MainActivity extends Activity implements View.OnClickListener {
private Button TopLeft;
private Button TopCenter;
private Button TopRight;
private Button CenterLeft;
private Button Center;
private Button CenterRight;
private Button BottomLeft;
private Button BottomCenter;
private Button BottomRight;
private Button newGameButton;
private Button gameGrid[][] = new Button[3][3];
private TextView displayOut;
private Random ran = new Random();
private int count = 9;
private View v;
private boolean p = false;
private boolean c = false;
// define the SharedPreferences object
private SharedPreferences savedValues;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Get references to the widgets
gameGrid[0][0] = (Button) findViewById(R.id.TopLeft);
gameGrid[0][1] = (Button) findViewById(R.id.TopCenter);
gameGrid[0][2] = (Button) findViewById(R.id.TopRight);
gameGrid[1][0] = (Button) findViewById(R.id.CenterLeft);
gameGrid[1][1] = (Button) findViewById(R.id.Center);
gameGrid[1][2] = (Button) findViewById(R.id.CenterRight);
gameGrid[2][0] = (Button) findViewById(R.id.BottomLeft);
gameGrid[2][1] = (Button) findViewById(R.id.BottomCenter);
gameGrid[2][2] = (Button) findViewById(R.id.BottomRight);
newGameButton = (Button) findViewById(R.id.NewGame);
displayOut = (TextView) findViewById(R.id.DisplayOut);
// set each button to listen for click
for (int x = 0; x < gameGrid.length; x++) {
for (int y = 0; y < gameGrid[x].length; y++) {
gameGrid[x][y].setOnClickListener(this);
}
newGameButton.setOnClickListener(this);
displayOut.setText("It's Player X's turn.");
}
}
@Override
public void onPause() {
super.onPause();
}
@Override
public void onResume() {
super.onResume();
}
public void onClick(View v) {
boolean check = false;
switch (v.getId())
{
case R.id.NewGame:
newGame();
break;
default:
{
playerTurn(v);
}
}
}
private void newGame() {
for (int x = 0; x < gameGrid.length; x++)
{
for (int y = 0; y < gameGrid[x].length; y++)
{
gameGrid[x][y].setText("");
gameGrid[x][y].setClickable(true);
displayOut.setText("It's Player X's turn.");
}
}
count = 9;
}
private void playerTurn(View v) {
for (int x = 0; x < gameGrid.length; x++)
{
for (int y = 0; y < gameGrid[x].length; y++)
{
if(gameGrid[x][y].getText() == "O")
{
gameGrid[x][y].setClickable(false);
}
if(gameGrid[x][y].getText()== "X")
{
gameGrid[x][y].setClickable(false);
}
else
{
gameGrid[x][y].setEnabled(true);
}
}
}
Button b = (Button) v;
b.setText("X");
p = checkWinner();
count--;
if(p == true)
{
displayOut.setText("Congrats Player X wins!");
endGame();
return;
}
if(count ==0 && p == false)
{
displayOut.setText("Sorry, you tied");
endGame();
return;
}
else
displayOut.setText("It's the computer's turn.");
computerTurn();
}
private void computerTurn() {
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
public void run() {
if (count == 0) {
displayOut.setText("Game Ends");
return;
}
//starts here
try {
//check to see if win vertically
for (int i = 0; i < 2; i++) {
if (gameGrid[0][i].getText() == gameGrid[1][i].getText() &&
gameGrid[0][i].getText() == "O") {
if (gameGrid[2][i].getText() == "") {
gameGrid[2][i].setText("O");
return;
}
}
}
for (int i = 0; i < 2; i++) {
if (gameGrid[2][i].getText() == gameGrid[1][i].getText() &&
gameGrid[2][i].getText() == "O") {
if (gameGrid[0][i].getText() == "") {
gameGrid[0][i].setText("O");
return;
}
}
}
for (int i = 0; i < 2; i++) {
if (gameGrid[2][i].getText() == gameGrid[0][i].getText() &&
gameGrid[2][i].getText() == "O") {
if (gameGrid[1][i].getText() == "") {
gameGrid[1][i].setText("O");
return;
}
}
}
//check to see if win horizontally
for (int i = 0; i < 2; i++) {
if (gameGrid[i][0].getText() == gameGrid[i][1].getText()
&& gameGrid[i][0].getText() == "O") {
if (gameGrid[i][2].getText() == "") {
gameGrid[i][2].setText("O");
return;
}
}
}
for (int i = 0; i < 2; i++) {
if (gameGrid[i][2].getText() == gameGrid[i][1].getText() &&
gameGrid[i][2].getText() == "O") {
if (gameGrid[i][0].getText() == "") {
gameGrid[i][0].setText("O");
return;
}
}
}
for (int i = 0; i < 2; i++) {
if (gameGrid[i][0].getText() == gameGrid[i][2].getText() &&
gameGrid[i][0].getText() == "O") {
if (gameGrid[i][1].getText() == "") {
gameGrid[i][1].setText("O");
return;
}
}
}
// check if you can take a win diagonally
if (gameGrid[0][0].getText() == gameGrid[1][1].getText()
&& gameGrid[0][0].getText() == "O") {
if (gameGrid[2][2].getText() == "") {
gameGrid[2][2].setText("O");
return;
}
}
if (gameGrid[2][2].getText() == gameGrid[1][1].getText()
&& gameGrid[2][2].getText() == "O") {
if (gameGrid[0][0].getText() == "") {
gameGrid[0][0].setText("O");
return;
}
}
if (gameGrid[2][2].getText() == gameGrid[0][0].getText() &&
gameGrid[2][2].getText() == "O") {
if (gameGrid[1][1].getText() == "") {
gameGrid[1][1].setText("O");
return;
}
}
if (gameGrid[0][2].getText() == gameGrid[1][1].getText()
&& gameGrid[0][2].getText() == "O") {
if (gameGrid[2][0].getText() == "") {
gameGrid[2][0].setText("O");
return;
}
}
if (gameGrid[2][0].getText() == gameGrid[1][1].getText()
&& gameGrid[2][0].getText() == "O") {
if (gameGrid[0][2].getText() == "") {
gameGrid[0][2].setText("O");
return;
}
}
if (gameGrid[2][0].getText() == gameGrid[0][2].getText() &&
gameGrid[2][0].getText() == "O") {
if (gameGrid[1][1].getText() == "") {
gameGrid[1][1].setText("O");
return;
}
}
// BLOCKS!!!! //
// check if you can block a win vertically
for (int i = 0; i < 2; i++) {
if (gameGrid[0][i].getText() == gameGrid[1][i].getText()
&& gameGrid[0][i].getText() == "X") {
if (gameGrid[2][i].getText() == "") {
gameGrid[2][i].setText("O");
return;
}
}
}
for (int i = 0; i < 2; i++) {
if (gameGrid[2][i].getText() == gameGrid[1][i].getText()
&& gameGrid[1][i].getText() == "X") {
if (gameGrid[0][i].getText() == "") {
gameGrid[0][i].setText("O");
return;
}
}
}
for (int i = 0; i < 2; i++) {
if (gameGrid[2][i].getText() == gameGrid[0][i].getText()
&& gameGrid[0][i].getText() == "X") {
if (gameGrid[1][i].getText() == "") {
gameGrid[1][i].setText("O");
return;
}
}
}
// check if you can block a win horizontally
for (int i = 0; i < 2; i++) {
if (gameGrid[i][0].getText() == gameGrid[i][1].getText()
&& gameGrid[i][0].getText() == "X") {
if (gameGrid[i][2].getText() == "") {
gameGrid[i][2].setText("O");
return;
}
}
}
for (int i = 0; i < 2; i++) {
if (gameGrid[i][2].getText() == gameGrid[i][1].getText()
&& gameGrid[i][2].getText() == "X") {
if (gameGrid[i][0].getText() == "") {
gameGrid[i][0].setText("O");
return;
}
}
}
for (int i = 0; i < 2; i++) {
if (gameGrid[i][2].getText() == gameGrid[i][0].getText()
&& gameGrid[i][0].getText() == "X") {
if (gameGrid[i][1].getText() == "") {
gameGrid[i][1].setText("O");
return;
}
}
}
// check if you can block a win diagonally
if (gameGrid[0][0].getText() == gameGrid[1][1].getText()
&& gameGrid[0][0].getText() == "X") {
if (gameGrid[2][2].getText() == "") {
gameGrid[2][2].setText("O");
return;
}
}
if (gameGrid[2][2].getText() == gameGrid[1][1].getText()
&& gameGrid[2][2].getText() == "X") {
if (gameGrid[0][0].getText() == "") {
gameGrid[0][0].setText("O");
return;
}
}
if (gameGrid[0][2].getText() == gameGrid[1][1].getText()
&& gameGrid[0][2].getText() == "X") {
if (gameGrid[2][0].getText() == "") {
gameGrid[2][0].setText("O");
return;
}
}
if (gameGrid[2][0].getText() == gameGrid[1][1].getText()
&& gameGrid[2][0].getText() == "X") {
if (gameGrid[0][2].getText() == "") {
gameGrid[0][2].setText("O");
return;
}
}
if (gameGrid[2][0].getText() == gameGrid[0][2].getText() &&
gameGrid[2][0].getText() == "X") {
if (gameGrid[1][1].getText() == "") {
gameGrid[1][1].setText("O");
return;
}
}
if (gameGrid[0][2].getText() == gameGrid[2][0].getText() &&
gameGrid[0][2].getText() == "X") {
if (gameGrid[1][1].getText() == "") {
gameGrid[1][1].setText("O");
return;
}
}
if (gameGrid[0][0].getText() == gameGrid[2][2].getText() &&
gameGrid[0][0].getText() == "X") {
if (gameGrid[1][1].getText() == "") {
gameGrid[1][1].setText("O");
return;
}
}
if (gameGrid[2][2].getText() == gameGrid[0][0].getText() &&
gameGrid[2][2].getText() == "X") {
if (gameGrid[1][1].getText() == "") {
gameGrid[1][1].setText("O");
return;
}
}
// make random move if above rules dont apply
ArrayList random = new ArrayList();
random.add("A");
random.add("B");
random.add("C");
random.add("D");
random.add("E");
random.add("F");
random.add("G");
random.add("H");
random.add("I");
String a = "";
for (int x = 0; x < gameGrid.length; x++) {
for (int y = 0; y < gameGrid[x].length; y++) {
if (gameGrid[x][y].getText() == "X" || gameGrid[x][y].getText() == "O") {
String z = x + "," + y;
if (z.equals("0,0")) {
a = "A";
} else if (z.equals("0,1")) {
a = "B";
} else if (z.equals("0,2")) {
a = "C";
} else if (z.equals("1,0")) {
a = "D";
} else if (z.equals("1,1")) {
a = "E";
} else if (z.equals("1,2")) {
a = "F";
} else if (z.equals("2,0")) {
a = "G";
} else if (z.equals("2,1")) {
a = "H";
} else if (z.equals("2,2")) {
a = "I";
} else {
displayOut.setText("Error in switch 1");
}
for (int i = 0; i < random.size(); i++) {
String b = (String) random.get(i);
if (b == a) {
random.remove(a);
}
}
}
}
}
ArrayList nRand = new ArrayList();
nRand = (ArrayList) random.clone();
if (nRand.size() <= 0) {
displayOut.setText("Game ends");
endGame();
return;
}
int index = ran.nextInt(nRand.size());
String num = (String) nRand.get(index);
if (num.equals("A")) {
gameGrid[0][0].setText("O");
gameGrid[0][0].setClickable(false);
} else if (num.equals("B")) {
gameGrid[0][1].setText("O");
gameGrid[0][1].setClickable(false);
} else if (num.equals("C")) {
gameGrid[0][2].setText("O");
gameGrid[0][2].setClickable(false);
} else if (num.equals("D")) {
gameGrid[1][0].setText("O");
gameGrid[1][0].setClickable(false);
} else if (num.equals("E")) {
gameGrid[1][1].setText("O");
gameGrid[1][1].setClickable(false);
} else if (num.equals("F")) {
gameGrid[1][2].setText("O");
gameGrid[1][2].setClickable(false);
} else if (num.equals("G")) {
gameGrid[2][0].setText("O");
gameGrid[2][0].setClickable(false);
} else if (num.equals("H")) {
gameGrid[2][1].setText("O");
gameGrid[2][1].setClickable(false);
} else if (num.equals("I")) {
gameGrid[2][2].setText("O");
gameGrid[2][2].setClickable(false);
} else {
displayOut.setText("Error in switch2");
}
} finally {
//ends here
c = checkWinner();
count--;
if (c == true) {
displayOut.setText("Sorry, computer wins");
endGame();
}
if (c == false && count == 0) {
displayOut.setText("Sorry, game ends in a tie");
endGame();
}
for (int x = 0; x < gameGrid.length; x++) {
for (int y = 0; y < gameGrid[x].length; y++) {
if (gameGrid[x][y].getText() == "X") {
gameGrid[x][y].setClickable(false);
}
if (gameGrid[x][y].getText() == "O") {
gameGrid[x][y].setClickable(false);
}
}
}
displayOut.setText("It's Player X's turn.");
}
}
}, 2000);
}
private boolean checkWinner() {
for (int i = 0; i < gameGrid.length; i++) {
//vertical win
if (gameGrid[i][0].getText()==gameGrid[i][1].getText() &&
gameGrid[i][1].getText()==gameGrid[i][2].getText() &&
gameGrid[i][1].getText()!= "")
{
return true;
}
//horizontal win(may need its own for loop)
if (gameGrid[0][i].getText()==gameGrid[1][i].getText() &&
gameGrid[1][i].getText()==gameGrid[2][i].getText()
&& gameGrid[1][i].getText() != "")
{
return true;
}
}
//diagonal win
if ( gameGrid[1][1].getText()==gameGrid[0][0].getText() &&
gameGrid[1][1].getText()==gameGrid[2][2].getText()
&& gameGrid[1][1].getText() != ""||
gameGrid[2][0].getText()==gameGrid[1][1].getText()&&
gameGrid[1][1].getText()==gameGrid[0][2].getText()
&&gameGrid[1][1].getText()!="")
{
return true;
}
else {
return false;
}
}
public void endGame() {
for (int x = 0; x < gameGrid.length; x++)
{
for (int y = 0; y < gameGrid[x].length; y++)
{
gameGrid[x][y].setClickable(false);
}
}
}
}
