试图在Android中编写一个简单的游戏，我解决了保存数据的问题。我使用共享首选项使用简单的键值对的路线，主要是因为我只保存10 - 15个简单的整数。但我不能将它保存在主Activity中。因为我似乎无法在Surface Created（在游戏面板中）调用它。此外，我尝试在游戏面板中保存数据的功能，但它不能在静态方法中创建。游戏面板是哪个。所以我似乎不知道该把它放在哪里。
这是GamePanel代码：
public class GamePanel extends SurfaceView implements SurfaceHolder.Callback {
private MainThread thread;
private UserObject player = new UserObject();
private MainActivity activity = new MainActivity();
private loadImage background;
private loadImage house;
private loadImage constructionWorker;
private loadImage houseUpgrade;
private loadImage bob;
private loadImage workGroup;
private loadImage bank;
private loadImage factory;
private loadImage superTapping;
private loadImage unlockStore;
private loadImage store;
int screenWidth = this.getResources().getDisplayMetrics().widthPixels;
int screenHeight = this.getResources().getDisplayMetrics().heightPixels;
Bitmap buttonVars = BitmapFactory.decodeResource(getResources(), R.drawable.house_upgrade);
int buttonWidth = buttonVars.getWidth();
int buttonHeight = buttonVars.getHeight();
Bitmap houseVars = BitmapFactory.decodeResource(getResources(), R.drawable.house_upgrade);
int houseWidth = houseVars.getWidth();
int houseHeight = houseVars.getHeight();
public GamePanel(Context context) {
super(context);
//add the callback to the surface holder to intercept events
getHolder().addCallback(this);
//make gamePanel focusable so it can handle events
setFocusable(true);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
activity.saveData();
boolean retry = true;
while (retry) {
try {
thread.setRunning(false);
thread.join();
retry = false;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
//we can safely start the game loop
activity.getData()
thread = new MainThread(getHolder(), this);
thread.setRunning(true);
thread.start();
//Create Bitmaps
background = new loadImage(BitmapFactory.decodeResource(getResources(), R.drawable.blue_background), 0, 0);
house = new loadImage(BitmapFactory.decodeResource(getResources(), R.drawable.crap_shack), ((screenWidth / 2) - houseWidth), (houseHeight * 2));
houseUpgrade = new loadImage(BitmapFactory.decodeResource(getResources(), R.drawable.house_upgrade), 0, (screenHeight - buttonHeight));
constructionWorker = new loadImage(BitmapFactory.decodeResource(getResources(), R.drawable.construction_worker), ((screenWidth / 2) - (buttonWidth / 2)), (screenHeight - buttonHeight));
bob = new loadImage(BitmapFactory.decodeResource(getResources(), R.drawable.bob), (screenWidth - buttonWidth), (screenHeight - buttonHeight));
workGroup = new loadImage(BitmapFactory.decodeResource(getResources(), R.drawable.work_group), 0, (screenHeight - (buttonHeight * 3)));
bank = new loadImage(BitmapFactory.decodeResource(getResources(), R.drawable.bank), ((screenWidth / 2) - (buttonWidth / 2)), (screenHeight - (buttonHeight * 3)));
factory = new loadImage(BitmapFactory.decodeResource(getResources(), R.drawable.factory), (screenWidth - buttonWidth), (screenHeight - (buttonHeight * 3)));
superTapping = new loadImage(BitmapFactory.decodeResource(getResources(), R.drawable.super_tapping), 0, (screenHeight - (buttonHeight * 5)));
unlockStore = new loadImage(BitmapFactory.decodeResource(getResources(), R.drawable.unlock_store), ((screenWidth / 2) - (buttonWidth / 2)), (screenHeight - (buttonHeight * 5)));
store = new loadImage(BitmapFactory.decodeResource(getResources(), R.drawable.store), (screenWidth - buttonWidth), (screenHeight - (buttonHeight * 5)));
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
//handle house
house.handleActionDown((int) event.getX(), (int) event.getY());
if (house.touched) {
player.money += player.MPC;
house.setTouched(false);
}
//handle houseUpgrade
houseUpgrade.handleActionDown((int) event.getX(), (int) event.getY());
if (houseUpgrade.touched && player.money >= player.houseUpgradeCost) {
player.money -= player.houseUpgradeCost;
player.MPC += 1;
player.houseUpgradeCost += 250;
houseUpgrade.setTouched(false);
}
//handle ConstructionWorker
constructionWorker.handleActionDown((int) event.getX(), (int) event.getY());
if (constructionWorker.touched && player.money >= player.constructionWorkerCost) {
player.money -= player.constructionWorkerCost;
player.MPS += 1;
player.constructionWorkerCost += 25;
constructionWorker.setTouched(false);
}
//handle bob
bob.handleActionDown((int) event.getX(), (int) event.getY());
if (bob.touched && player.money >= player.bobCost) {
player.money -= player.bobCost;
player.MPS += 5;
player.bobCost += 200;
bob.setTouched(false);
}
//handle workGroup
workGroup.handleActionDown((int) event.getX(), (int) event.getY());
if (workGroup.touched && player.money >= player.workGroupCost) {
player.money -= player.workGroupCost;
player.MPS += 50;
player.workGroupCost += 1250;
workGroup.setTouched(false);
}
//handle bank
bank.handleActionDown((int) event.getX(), (int) event.getY());
if (bank.touched && player.money >= player.bankCost) {
player.money -= player.bankCost;
player.MPS += 250;
player.bankCost += 5000;
bank.setTouched(false);
}
//handle Factory
factory.handleActionDown((int) event.getX(), (int) event.getY());
if (factory.touched && player.money >= player.factoryCost) {
player.money -= player.factoryCost;
player.MPS += 1000;
player.factoryCost += 25000;
factory.setTouched(false);
}
//handle superTapping
superTapping.handleActionDown((int) event.getX(), (int) event.getY());
if (superTapping.touched && player.money >= player.superTappingCost) {
player.money -= player.superTappingCost;
player.MPC += 25;
player.superTappingCost += 7500;
superTapping.setTouched(false);
}
//handle unlockStore
unlockStore.handleActionDown((int) event.getX(), (int) event.getY());
if (unlockStore.touched && player.money >= player.unlockStoreCost && !player.storeUnlocked) {
player.money -= player.unlockStoreCost;
player.storeUnlocked = true;
unlockStore.setTouched(false);
}
//handle store
store.handleActionDown((int) event.getX(), (int) event.getY());
if (store.touched && player.storeUnlocked) {
}
}
if (event.getAction() == MotionEvent.ACTION_UP) {
house.setTouched(false);
houseUpgrade.setTouched(false);
constructionWorker.setTouched(false);
bob.setTouched(false);
workGroup.setTouched(false);
bank.setTouched(false);
factory.setTouched(false);
superTapping.setTouched(false);
unlockStore.setTouched(false);
}
return super.onTouchEvent(event);
}
public void draw(Canvas canvas) {
//Draws to canvas
background.draw(canvas);
house.draw(canvas);
houseUpgrade.draw(canvas);
constructionWorker.draw(canvas);
bob.draw(canvas);
workGroup.draw(canvas);
bank.draw(canvas);
factory.draw(canvas);
superTapping.draw(canvas);
unlockStore.draw(canvas);
if (player.storeUnlocked) {
store.draw(canvas);
}
writeText(canvas, "Money: $" + player.money, Paint.Align.CENTER, Color.BLACK, 25, (screenWidth / 2), 50);
writeText(canvas, "MPS: " + player.MPS, Paint.Align.CENTER, Color.BLACK, 25, (screenWidth / 2), 75);
writeText(canvas, "MPC: " + player.MPC, Paint.Align.CENTER, Color.BLACK, 25, (screenWidth / 2), 100);
writeText(canvas, "Cost: $" + player.houseUpgradeCost, null, Color.BLACK, 15, 0, (screenHeight - buttonHeight));
writeText(canvas, "Cost: $" + player.constructionWorkerCost, Paint.Align.CENTER, Color.BLACK, 15, (screenWidth / 2), (screenHeight - buttonHeight));
writeText(canvas, "Cost: $" + player.bobCost, Paint.Align.LEFT, Color.BLACK, 15, screenWidth, (screenHeight - buttonHeight));
writeText(canvas, "Cost: $" + player.workGroupCost, null, Color.BLACK, 15, 0, ((screenHeight - (buttonHeight * 3))));
writeText(canvas, "Cost: $" + player.bankCost, Paint.Align.CENTER, Color.BLACK, 15, (screenWidth / 2), ((screenHeight - (buttonHeight * 3))));
writeText(canvas, "Cost: $" + player.factoryCost, Paint.Align.LEFT, Color.BLACK, 15, (screenWidth), ((screenHeight - (buttonHeight * 3))));
writeText(canvas, "Cost: $" + player.superTappingCost, null, Color.BLACK, 15, 0, ((screenHeight - (buttonHeight * 5))));
writeText(canvas, "Cost: $" + player.unlockStoreCost, Paint.Align.CENTER, Color.BLACK, 15, (screenWidth / 2), ((screenHeight - (buttonHeight * 5))));
}
private void writeText(Canvas canvas, String text, Paint.Align align, int color, int textSize, int x, int y) {
//Sets default align if null
if (align == null) {
align = Paint.Align.RIGHT;
}
//Sets paint using values
Paint paint = new Paint();
paint.setTextAlign(align);
paint.setColor(color);
paint.setTextSize(textSize);
canvas.drawText(text, x, y, paint);
}
}
以下是我尝试保存数据的实际主要活动。
public class MainActivity extends Activity {
private UserObject player = new UserObject();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Sets window settings FULLSCREEN, NO TITLE, NO ACTION BAR.
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(new GamePanel(this));
}
public void saveData() {
SharedPreferences sharedPreferences = getSharedPreferences("houseTapper_dataSaveFile", MODE_PRIVATE);
SharedPreferences.Editor sharedPreferencesEditor = sharedPreferences.edit();
sharedPreferencesEditor.putInt("money", player.money);
sharedPreferencesEditor.putInt("MPS", player.MPS);
sharedPreferencesEditor.putInt("MPC", player.MPC);
sharedPreferencesEditor.putInt("houseUpgradeCost", player.houseUpgradeCost);
sharedPreferencesEditor.putInt("constructionWorkerCost", player.constructionWorkerCost);
sharedPreferencesEditor.putInt("bobCost", player.bobCost);
sharedPreferencesEditor.putInt("workGroupCost", player.workGroupCost);
sharedPreferencesEditor.putInt("bankCost", player.bankCost);
sharedPreferencesEditor.putInt("factoryCost", player.factoryCost);
sharedPreferencesEditor.putInt("superTappingCost", player.superTappingCost);
sharedPreferencesEditor.putBoolean("storeUnlocked", player.storeUnlocked);
sharedPreferencesEditor.apply();
}
public void getData() {
SharedPreferences sharedPreferences = getSharedPreferences("houseTapper_dataSaveFile", MODE_PRIVATE);
player.money = sharedPreferences.getInt("money", 0);
player.MPS = sharedPreferences.getInt("MPS", 0);
player.MPC = sharedPreferences.getInt("MPC", 0);
player.houseUpgradeCost = sharedPreferences.getInt("houseUpgradeCost", 0);
player.constructionWorkerCost = sharedPreferences.getInt("constructionWorkerCost", 0);
player.bobCost = sharedPreferences.getInt("bobCost", 0);
player.workGroupCost = sharedPreferences.getInt("workGroupCost", 0);
player.bankCost = sharedPreferences.getInt("bankCost", 0);
player.factoryCost = sharedPreferences.getInt("factoryCost", 0);
player.superTappingCost = sharedPreferences.getInt("superTappingCost", 0);
player.storeUnlocked = sharedPreferences.getBoolean("storeUnlocked", false);
}
}
Finnaly这里是mainThread
public class MainThread extends Thread {
private UserObject player = new UserObject();
private int FPS = 30;
private SurfaceHolder surfaceHolder;
private GamePanel gamePanel;
private boolean running;
public static Canvas canvas;
//Game variables
public MainThread(SurfaceHolder surfaceHolder, GamePanel gamePanel) {
super();
this.surfaceHolder = surfaceHolder;
this.gamePanel = gamePanel;
}
@Override
public void run() {
long startTime;
long timeMillis;
long waitTime;
long targetTime = 1000/FPS;
int frames = 0;
while(running) {
startTime = System.nanoTime();
canvas = null;
if (frames == 30) {
frames = 0;
player.money += player.MPS;
}
//try locking the canvas for pixel editing
try {
canvas = this.surfaceHolder.lockCanvas();
synchronized (surfaceHolder) {
this.gamePanel.draw(canvas);
}
} catch (Exception e) {
}
finally{
if(canvas!=null)
{
try {
surfaceHolder.unlockCanvasAndPost(canvas);
}
catch(Exception e){e.printStackTrace();}
}
}
timeMillis = (System.nanoTime() - startTime) / 1000000;
waitTime = targetTime-timeMillis;
frames++;
try {
this.sleep(waitTime);
} catch(Exception e) {}
}
}
public void setRunning(boolean b)
{
running=b;
}
}
我遗漏了LoadImage和UserObject类。因为它们不重要。
答案 0 :(得分：2)
保存/加载与活动有什么关系？没什么，你可能只是从那里开始，但它没有理由留在那里。
所以将Persistence分离到自己的班级，然后你可以在任何有Context的地方打电话：
public final class Persistence {
private final SharedPreferences sharedPreferences;
public Persistence(Context context) {
sharedPreferences = context.getSharedPreferences("houseTapper_dataSaveFile", MODE_PRIVATE);
}
public void saveData(Player player) {
SharedPreferences.Editor sharedPreferencesEditor = sharedPreferences.edit();
sharedPreferencesEditor.putInt("money", player.money);
sharedPreferencesEditor.putInt("MPS", player.MPS);
sharedPreferencesEditor.putInt("MPC", player.MPC);
// etc...
sharedPreferencesEditor.apply();
}
public void getData(Player player) {
player.money = sharedPreferences.getInt("money", 0);
player.MPS = sharedPreferences.getInt("MPS", 0);
player.MPC = sharedPreferences.getInt("MPC", 0);
// etc...
}
}
用法：
public class GamePanel extends SurfaceView implements SurfaceHolder.Callback {
private final Persistence persistence = new Persistence(getContext());
@Override
public void surfaceCreated(SurfaceHolder holder) {
//we can safely start the game loop
persistence.getData(player);
}
答案 1 :(得分：1)
使用getActivity（）而不是新的MainActivity（）。
<a href="link to extract" title="title to extract" rel="category tag" data-spm-anchor-id="0.0.0.0">or maybe this word instead of title</a>