我刚开始在 android 中进行游戏开发，我正在开发一个超级简单的游戏。
游戏基本上就像是飞扬的小鸟。
我设法让一切正常工作，但我遇到了很多口吃和滞后。
我用于测试的手机是 LG G2，所以它应该并且确实运行比这更重和更复杂的游戏。
基本上有 4 个“障碍”，它们彼此相隔一个全屏宽度。
游戏开始时，障碍物开始以恒定速度移动（朝向角色）。玩家角色的 x 值在整个游戏中是一致的，而其 y 值会发生变化。
延迟主要发生在角色通过障碍物时（有时也会在障碍物之后一点点）。发生的情况是，每次绘制游戏状态时都会出现不均匀的延迟，从而导致动作卡顿。
- GC 没有按照日志运行。
- 口吃不是因为速度太快造成的（我知道是因为在游戏开始时，当障碍物不在视线范围内时，角色移动很顺畅）
- 我不认为这个问题也与 FPS 相关，因为即使 MAX_FPS 字段设置为 100，仍然存在口吃。
我的想法是，有一行或多行代码会导致某种延迟发生（从而跳过帧）。我也认为这些行应该围绕 ,和的update()和draw()方法。 PlayerCharacterObstacleMainGameBoard
问题是，我对 android 开发和 android游戏开发还是新手，所以我不知道是什么导致了这种延迟。
我试着在网上寻找答案......不幸的是，我发现所有这些都指向 GC 应该受到指责。但是，我不相信这种情况（如果我错了，请纠正我）这些答案不适用于我。我还阅读了 android 开发者Performance Tips页面，但找不到任何帮助。
所以，请帮我找到解决这些恼人滞后问题的答案！
一些代码
主线程.java：
public class MainThread extends Thread {
public static final String TAG = MainThread.class.getSimpleName();
private final static int MAX_FPS = 60; // desired fps
private final static int MAX_FRAME_SKIPS = 5; // maximum number of frames to be skipped
private final static int FRAME_PERIOD = 1000 / MAX_FPS; // the frame period
private boolean running;
public void setRunning(boolean running) {
this.running = running;
}
private SurfaceHolder mSurfaceHolder;
private MainGameBoard mMainGameBoard;
public MainThread(SurfaceHolder surfaceHolder, MainGameBoard gameBoard) {
super();
mSurfaceHolder = surfaceHolder;
mMainGameBoard = gameBoard;
}
@Override
public void run() {
Canvas mCanvas;
Log.d(TAG, "Starting game loop");
long beginTime; // the time when the cycle begun
long timeDiff; // the time it took for the cycle to execute
int sleepTime; // ms to sleep (<0 if we're behind)
int framesSkipped; // number of frames being skipped
sleepTime = 0;
while(running) {
mCanvas = null;
try {
mCanvas = this.mSurfaceHolder.lockCanvas();
synchronized (mSurfaceHolder) {
beginTime = System.currentTimeMillis();
framesSkipped = 0;
this.mMainGameBoard.update();
this.mMainGameBoard.render(mCanvas);
timeDiff = System.currentTimeMillis() - beginTime;
sleepTime = (int) (FRAME_PERIOD - timeDiff);
if(sleepTime > 0) {
try {
Thread.sleep(sleepTime);
} catch (InterruptedException e) {}
}
while(sleepTime < 0 && framesSkipped < MAX_FRAME_SKIPS) {
// catch up - update w/o render
this.mMainGameBoard.update();
sleepTime += FRAME_PERIOD;
framesSkipped++;
}
}
} finally {
if(mCanvas != null)
mSurfaceHolder.unlockCanvasAndPost(mCanvas);
}
}
}
}
MainGameBoard.java：
public class MainGameBoard extends SurfaceView implements
SurfaceHolder.Callback {
private MainThread mThread;
private PlayerCharacter mPlayer;
private Obstacle[] mObstacleArray = new Obstacle[4];
public static final String TAG = MainGameBoard.class.getSimpleName();
private long width, height;
private boolean gameStartedFlag = false, gameOver = false, update = true;
private Paint textPaint = new Paint();
private int scoreCount = 0;
private Obstacle collidedObs;
public MainGameBoard(Context context) {
super(context);
getHolder().addCallback(this);
DisplayMetrics displaymetrics = new DisplayMetrics();
((Activity) getContext()).getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
height = displaymetrics.heightPixels;
width = displaymetrics.widthPixels;
mPlayer = new PlayerCharacter(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher), width/2, height/2);
for (int i = 1; i <= 4; i++) {
mObstacleArray[i-1] = new Obstacle(width*(i+1) - 200, height, i);
}
mThread = new MainThread(getHolder(), this);
setFocusable(true);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
mThread.setRunning(true);
mThread.start();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
Log.d(TAG, "Surface is being destroyed");
// tell the thread to shut down and wait for it to finish
// this is a clean shutdown
boolean retry = true;
while (retry) {
try {
mThread.join();
retry = false;
} catch (InterruptedException e) {
// try again shutting down the thread
}
}
Log.d(TAG, "Thread was shut down cleanly");
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN) {
if(update && !gameOver) {
if(gameStartedFlag) {
mPlayer.cancelJump();
mPlayer.setJumping(true);
}
if(!gameStartedFlag)
gameStartedFlag = true;
}
}
return true;
}
@SuppressLint("WrongCall")
public void render(Canvas canvas) {
onDraw(canvas);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.GRAY);
mPlayer.draw(canvas);
for (Obstacle obs : mObstacleArray) {
obs.draw(canvas);
}
if(gameStartedFlag) {
textPaint.reset();
textPaint.setColor(Color.WHITE);
textPaint.setTextAlign(Paint.Align.CENTER);
textPaint.setTextSize(100);
canvas.drawText(String.valueOf(scoreCount), width/2, 400, textPaint);
}
if(!gameStartedFlag && !gameOver) {
textPaint.reset();
textPaint.setColor(Color.WHITE);
textPaint.setTextAlign(Paint.Align.CENTER);
textPaint.setTextSize(72);
canvas.drawText("Tap to start", width/2, 200, textPaint);
}
if(gameOver) {
textPaint.reset();
textPaint.setColor(Color.WHITE);
textPaint.setTextAlign(Paint.Align.CENTER);
textPaint.setTextSize(86);
canvas.drawText("GAME OVER", width/2, 200, textPaint);
}
}
public void update() {
if(gameStartedFlag && !gameOver) {
for (Obstacle obs : mObstacleArray) {
if(update) {
if(obs.isColidingWith(mPlayer)) {
collidedObs = obs;
update = false;
gameOver = true;
return;
} else {
obs.update(width);
if(obs.isScore(mPlayer))
scoreCount++;
}
}
}
if(!mPlayer.update() || !update)
gameOver = true;
}
}
}
PlayerCharacter.java：
public void draw(Canvas canvas) {
canvas.drawBitmap(mBitmap, (float) x - (mBitmap.getWidth() / 2), (float) y - (mBitmap.getHeight() / 2), null);
}
public boolean update() {
if(jumping) {
y -= jumpSpeed;
jumpSpeed -= startJumpSpd/20f;
jumpTick--;
} else if(!jumping) {
if(getBottomY() >= startY*2)
return false;
y += speed;
speed += startSpd/25f;
}
if(jumpTick == 0) {
jumping = false;
cancelJump(); //rename
}
return true;
}
public void cancelJump() { //also called when the user touches the screen in order to stop a jump and start a new jump
jumpTick = 20;
speed = Math.abs(jumpSpeed);
jumpSpeed = 20f;
}
障碍物.java：
public void draw(Canvas canvas) {
Paint pnt = new Paint();
pnt.setColor(Color.CYAN);
canvas.drawRect(x, 0, x+200, ySpaceStart, pnt);
canvas.drawRect(x, ySpaceStart+500, x+200, y, pnt);
pnt.setColor(Color.RED);
canvas.drawCircle(x, y, 20f, pnt);
}
public void update(long width) {
x -= speed;
if(x+200 <= 0) {
x = ((startX+200)/(index+1))*4 - 200;
ySpaceStart = r.nextInt((int) (y-750-250+1)) + 250;
scoreGiven = false;
}
}
public boolean isColidingWith(PlayerCharacter mPlayer) {
if(mPlayer.getRightX() >= x && mPlayer.getLeftX() <= x+20)
if(mPlayer.getTopY() <= ySpaceStart || mPlayer.getBottomY() >= ySpaceStart+500)
return true;
return false;
}
public boolean isScore(PlayerCharacter mPlayer) {
if(mPlayer.getRightX() >= x+100 && !scoreGiven) {
scoreGiven = true;
return true;
}
return false;
}