嗨，在过去的几个月里，我一直在尝试制作一个来自 android studios 的游戏，但目前我一直在尝试保存高分，但我收到了这个错误“无法解析方法‘getSharedPreferences(Java. lang.String.int)”。我不明白该怎么做我尝试了其他方法，但似乎不起作用，所以我尝试了这种方法。请帮忙。这是代码。
public class GamePanel extends SurfaceView implements SurfaceHolder.Callback
{
public static final int WIDTH = 856;
public static final int HEIGHT = 480;
public static final int MOVESPEED = -5;
private long smokeStartTime;
private long missileStartTime;
private MainThread thread;
private Background bg;
private Player player;
private ArrayList<Smokepuff> smoke;
private ArrayList<Missile> missiles;
private ArrayList<TopBorder> topborder;
private ArrayList<BotBorder> botborder;
private Random rand = new Random();
private int maxBorderHeight;
private int minBorderHeight;
private boolean topDown = true;
private boolean botDown = true;
private boolean newGameCreated;
public static int HighScore = 0;
public static SharedPreferences prefs;
private String saveScore = "HighScore";
//increase to slow down difficulty progression, decrease to speed up difficulty progression
private int progressDenom = 20;
private Explosion explosion;
private long startReset;
private boolean reset;
private boolean dissapear;
private boolean started;
public static int highScore;
public GamePanel(Context context)
{
super(context);
Context pref;
SharedPreferences prefs = this.getSharedPreferences("myPrefsKeys", Context.MODE_PRIVATE);
int oldScore = prefs.getInt("highScore", 0);
int newScore = Player.getScore()*3;
//update score only if new score is higher
if(newScore > oldScore ){
Editor edit = prefs.edit();
edit.putInt("highScore", newScore);
edit.commit();
highScore = newScore;
}
String spackage = "com.knight.myfirstgame";
HighScore = prefs.getInt(saveScore, 0);
//add the callback to the surfaceholder 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){
boolean retry = true;
int counter = 0;
while(retry && counter<1000)
{
counter++;
try{thread.setRunning(false);
thread.join();
retry = false;
thread = null;
}catch(InterruptedException e){e.printStackTrace();}
}
}
@Override
public void surfaceCreated(SurfaceHolder holder){
bg = new Background(BitmapFactory.decodeResource(getResources(), R.drawable.grassbg1));
player = new Player(BitmapFactory.decodeResource(getResources(), R.drawable.helicopter), 65, 25, 3);
smoke = new ArrayList<Smokepuff>();
missiles = new ArrayList<Missile>();
topborder = new ArrayList<TopBorder>();
botborder = new ArrayList<BotBorder>();
smokeStartTime= System.nanoTime();
missileStartTime = System.nanoTime();
thread = new MainThread(getHolder(), this);
//we can safely start the game loop
thread.setRunning(true);
thread.start();
}
@Override
public boolean onTouchEvent(MotionEvent event)
{
if(event.getAction()==MotionEvent.ACTION_DOWN){
if(!player.getPlaying() && newGameCreated && reset)
{
player.setPlaying(true);
player.setUp(true);
}
if(player.getPlaying())
{
if(!started)started = true;
reset = false;
player.setUp(true);
}
return true;
}
if(event.getAction()==MotionEvent.ACTION_UP)
{
player.setUp(false);
return true;
}
return super.onTouchEvent(event);
}
public void update()
{
if(player.getPlaying()) {
if(botborder.isEmpty())
{
player.setPlaying(false);
return;
}
if(topborder.isEmpty())
{
player.setPlaying(false);
return;
}
bg.update();
player.update();
//calculate the threshold of height the border can have based on the score
//max and min border heart are updated, and the border switched direction when either max or
//min is met
maxBorderHeight = 30+player.getScore()/progressDenom;
//cap max border height so that borders can only take up a total of 1/2 the screen
if(maxBorderHeight > HEIGHT/4)maxBorderHeight = HEIGHT/4;
minBorderHeight = 5+player.getScore()/progressDenom;
//check bottom border collision
for(int i = 0; i<botborder.size(); i++)
{
if(collision(botborder.get(i), player))
player.setPlaying(false);
}
//check top border collision
for(int i = 0; i <topborder.size(); i++)
{
if(collision(topborder.get(i),player))
player.setPlaying(false);
}
//update top border
this.updateTopBorder();
//udpate bottom border
this.updateBottomBorder();
//add missiles on timer
long missileElapsed = (System.nanoTime()-missileStartTime)/1000000;
if(missileElapsed >(2000 - player.getScore()/4)){
//first missile always goes down the middle
if(missiles.size()==0)
{
missiles.add(new Missile(BitmapFactory.decodeResource(getResources(),R.drawable.
missile),WIDTH + 10, HEIGHT/2, 45, 15, player.getScore(), 13));
}
else
{
missiles.add(new Missile(BitmapFactory.decodeResource(getResources(),R.drawable.missile),
WIDTH+10, (int)(rand.nextDouble()*(HEIGHT - (maxBorderHeight * 2))+maxBorderHeight),45,15, player.getScore(),13));
}
//reset timer
missileStartTime = System.nanoTime();
}
//loop through every missile and check collision and remove
for(int i = 0; i<missiles.size();i++)
{
//update missile
missiles.get(i).update();
if(collision(missiles.get(i),player))
{
missiles.remove(i);
player.setPlaying(false);
break;
}
//remove missile if it is way off the screen
if(missiles.get(i).getX()<-100)
{
missiles.remove(i);
break;
}
}
//add smoke puffs on timer
long elapsed = (System.nanoTime() - smokeStartTime)/1000000;
if(elapsed > 120){
smoke.add(new Smokepuff(player.getX(), player.getY()+10));
smokeStartTime = System.nanoTime();
}
for(int i = 0; i<smoke.size();i++)
{
smoke.get(i).update();
if(smoke.get(i).getX()<-10)
{
smoke.remove(i);
}
}
}
else{
player.resetDY();
if(!reset)
{
newGameCreated = false;
startReset = System.nanoTime();
reset = true;
dissapear = true;
explosion = new Explosion(BitmapFactory.decodeResource(getResources(),R.drawable.explosion),player.getX(),
player.getY()-30, 100, 100, 25);
}
explosion.update();
long resetElapsed = (System.nanoTime()-startReset)/1000000;
if(resetElapsed > 2500 && !newGameCreated)
{
newGame();
}
}
}
public boolean collision(GameObject a, GameObject b)
{
if(Rect.intersects(a.getRectangle(), b.getRectangle()))
{
return true;
}
return false;
}
@Override
public void draw(Canvas canvas)
{
final float scaleFactorX = getWidth()/(WIDTH*1.f);
final float scaleFactorY = getHeight()/(HEIGHT*1.f);
if(canvas!=null) {
final int savedState = canvas.save();
canvas.scale(scaleFactorX, scaleFactorY);
bg.draw(canvas);
if(!dissapear) {
player.draw(canvas);
}
//draw smokepuffs
for(Smokepuff sp: smoke)
{
sp.draw(canvas);
}
//draw missiles
for(Missile m: missiles)
{
m.draw(canvas);
}
//draw topborder
for(TopBorder tb: topborder)
{
tb.draw(canvas);
}
//draw botborder
for(BotBorder bb: botborder)
{
bb.draw(canvas);
}
//draw explosion
if(started)
{
explosion.draw(canvas);
}
drawText(canvas);
canvas.restoreToCount(savedState);
}
}
public void updateTopBorder()
{
//every 50 points, insert randomly placed top blocks that break the pattern
if(player.getScore()%50 ==0)
{
topborder.add(new TopBorder(BitmapFactory.decodeResource(getResources(),R.drawable.brick
),topborder.get(topborder.size()-1).getX()+20,0,(int)((rand.nextDouble()*(maxBorderHeight
))+1)));
}
for(int i = 0; i<topborder.size(); i++)
{
topborder.get(i).update();
if(topborder.get(i).getX()<-20)
{
topborder.remove(i);
//remove element of arraylist, replace it by adding a new one
//calculate topdown which determines the direction the border is moving (up or down)
if(topborder.get(topborder.size()-1).getHeight()>=maxBorderHeight)
{
topDown = false;
}
if(topborder.get(topborder.size()-1).getHeight()<=minBorderHeight)
{
topDown = true;
}
//new border added will have larger height
if(topDown)
{
topborder.add(new TopBorder(BitmapFactory.decodeResource(getResources(),
R.drawable.brick),topborder.get(topborder.size()-1).getX()+20,
0, topborder.get(topborder.size()-1).getHeight()+1));
}
//new border added wil have smaller height
else
{
topborder.add(new TopBorder(BitmapFactory.decodeResource(getResources(),
R.drawable.brick),topborder.get(topborder.size()-1).getX()+20,
0, topborder.get(topborder.size()-1).getHeight()-1));
}
}
}
}
public void updateBottomBorder()
{
//every 40 points, insert randomly placed bottom blocks that break pattern
if(player.getScore()%40 == 0)
{
botborder.add(new BotBorder(BitmapFactory.decodeResource(getResources(), R.drawable.brick),
botborder.get(botborder.size()-1).getX()+20,(int)((rand.nextDouble()
*maxBorderHeight)+(HEIGHT-maxBorderHeight))));
}
//update bottom border
for(int i = 0; i<botborder.size(); i++)
{
botborder.get(i).update();
//if border is moving off screen, remove it and add a corresponding new one
if(botborder.get(i).getX()<-20) {
botborder.remove(i);
//determine if border will be moving up or down
if (botborder.get(botborder.size() - 1).getY() <= HEIGHT-maxBorderHeight) {
botDown = true;
}
if (botborder.get(botborder.size() - 1).getY() >= HEIGHT - minBorderHeight) {
botDown = false;
}
if (botDown) {
botborder.add(new BotBorder(BitmapFactory.decodeResource(getResources(), R.drawable.brick
), botborder.get(botborder.size() - 1).getX() + 20, botborder.get(botborder.size() - 1
).getY() + 1));
} else {
botborder.add(new BotBorder(BitmapFactory.decodeResource(getResources(), R.drawable.brick
), botborder.get(botborder.size() - 1).getX() + 20, botborder.get(botborder.size() - 1
).getY() - 1));
}
}
}
}
public void newGame()
{
dissapear = false;
botborder.clear();
topborder.clear();
missiles.clear();
smoke.clear();
minBorderHeight = 5;
maxBorderHeight = 30;
player.resetDY();
player.resetScore();
player.setY(HEIGHT/2);
//create initial borders
//initial top border
for(int i = 0; i*20<WIDTH+40;i++)
{
//first top border create
if(i==0)
{
topborder.add(new TopBorder(BitmapFactory.decodeResource(getResources(),R.drawable.brick
),i*20,0, 10));
}
else
{
topborder.add(new TopBorder(BitmapFactory.decodeResource(getResources(),R.drawable.brick
),i*20,0, topborder.get(i-1).getHeight()+1));
}
}
//initial bottom border
for(int i = 0; i*20<WIDTH+40; i++)
{
//first border ever created
if(i==0)
{
botborder.add(new BotBorder(BitmapFactory.decodeResource(getResources(),R.drawable.brick)
,i*20,HEIGHT - minBorderHeight));
}
//adding borders until the initial screen is filed
else
{
botborder.add(new BotBorder(BitmapFactory.decodeResource(getResources(), R.drawable.brick),
i * 20, botborder.get(i - 1).getY() - 1));
}
}
newGameCreated = true;
}
public void drawText(Canvas canvas) {
Paint paint = new Paint();
paint.setColor(Color.BLACK);
paint.setTextSize(30);
paint.setTypeface(Typeface.create(Typeface.DEFAULT, Typeface.BOLD));
canvas.drawText("DISTANCE: " + (Player.getScore() * 3), 10, HEIGHT - 10, paint);
canvas.drawText("HighScore: " + highScore, WIDTH - 215, HEIGHT - 10, paint);
if (!player.getPlaying() && newGameCreated && reset) {
Paint paint1 = new Paint();
paint1.setTextSize(40);
paint1.setTypeface(Typeface.create(Typeface.DEFAULT, Typeface.BOLD));
canvas.drawText("PRESS TO START", WIDTH / 2 - 50, HEIGHT / 2, paint1);
paint1.setTextSize(20);
canvas.drawText("PRESS AND HOLD TO GO UP", WIDTH / 2 - 50, HEIGHT / 2 + 20, paint1);
canvas.drawText("RELEASE TO GO DOWN", WIDTH / 2 - 50, HEIGHT / 2 + 40, paint1);
}
}
}
最佳答案
getSharedPreferences是Context的方法，Context的子类，如Activity。
GamePanel 扩展了 View，但没有扩展 Context，所以没有这样的方法。
你可以这样做
context.getSharedPreferences(...)
如果您需要在构造函数之外执行此操作，范围内没有变量 context，您可以执行此操作
this.getContext().getSharedPreferences(...)
关于java - 为什么我会收到此错误 "cannot resolve method ' getSharedPreferences (Java.lang.String.int)”，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33380455/
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