我是Android的新手，我无法确定如何正确编码保存当前游戏，以便在我离开时因为方向切换或按下主页按钮并返回应用程序而继续。我已经阅读了有关首选项和onSaveInstanceState的内容，但是，我很难正确地设置它以使用我的Tic-Tac-Toe应用程序。有人可以帮我设置一下并解释一下这个过程吗？提前谢谢。
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);
}
}
}
}
答案 0 :(得分：0)
首先，尝试搜索，因为有很多帖子，人们会问你这样的事情。
我建议您查看活动生命周期 https://developer.android.com/guide/components/activities/activity-lifecycle.html 当你想保存活动中某些东西的信息时，你必须调用onCreate（），onStart（），onResume（），onPause（），onStop（）和onDestroy（）取决于用户做了什么（关闭，改变）应用程序等）
如果您在上面的页面中看到示例，这正是您想要的。例如在onCreate（）中：
// recovering the instance state
if (savedInstanceState != null) {
mGameState = savedInstanceState.getString(GAME_STATE_KEY);
}
所以你应该在onDestroy（）中保存状态：
// invoked when the activity may be temporarily destroyed, save the instance state here
@Override
public void onSaveInstanceState(Bundle outState) {
outState.putString(GAME_STATE_KEY, mGameState);
outState.putString(TEXT_VIEW_KEY, mTextView.getText());
// call superclass to save any view hierarchy
super.onSaveInstanceState(outState);
}
在你的情况下，你应该保存游戏网格。
其他方法是覆盖onSaveInstanceState（Bundle savedInstanceState） 和onRestoreInstanceState（Bundle savedInstanceState）一样，Reto Meier说 Saving Android Activity state using Save Instance State