我试图制作这款游戏应用。
每次在Surfaceview ChickenView中调用UpdateCourt（）时，我基本上都会让这个BitMap bMapEgg向下移动。我面临的问题是它看起来很粗糙。位图的移动看起来不平滑。
ballPosition.y += 18;是使其移动的代码。
任何想法如何让它看起来流畅？
public class MainActivity extends Activity implements View.OnTouchListener{
static Canvas canvas;
static ChickenView chickenView;
//Used for getting display details like the number of pixels
static Display display;
static Point size;
static int screenWidth;
static int screenHeight;
static Point ballPosition;
static int ballWidth;
static boolean ballIsMovingDown;
//stats
static long lastFrameTime;
static int fps;
static int score;
static int lives;
static float bitmapPositionX ;
static float bitmapPositionY ;
static float bitmapWidth ;
static float bitmapHeight;
static Bitmap bMapEgg;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
chickenView = (ChickenView) findViewById(R.id.chickenView);
//Get the screen size in pixels
display = getWindowManager().getDefaultDisplay();
size = new Point();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
display.getSize(size);
}
screenWidth = size.x;
screenHeight = size.y;
ballWidth = screenWidth / 35;
ballPosition = new Point();
ballPosition.x = screenWidth / 2;
ballPosition.y = 1 + ballWidth;
final ImageView imageEggs = (ImageView)findViewById(R.id.imageEggs);
final ImageView imageUpgrade = (ImageView)findViewById(R.id.imageUpgrade);
TextView test = (TextView)findViewById(R.id.textEggs);
imageUpgrade.setOnTouchListener(this);
chickenView.setOnTouchListener(this);
}
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (v.getId()) {
case R.id.imageUpgrade:
if (event.getAction() == MotionEvent.ACTION_DOWN) {
final int x = (int) event.getX();
final int y = (int) event.getY();
//now map the coords we got to the
//bitmap (because of scaling)
ImageView imageView = ((ImageView)v);
Bitmap bitmap =((BitmapDrawable)imageView.getDrawable()).getBitmap();
int pixel = bitmap.getPixel(x,y);
//now check alpha for transparency
int alpha = Color.alpha(pixel);
if (alpha != 0) {
//do whatever you would have done for your click event here
Intent i;
i = new Intent(this, StructureActivity.class);
startActivity(i);
}
}
break;
case R.id.chickenView:
float x = event.getX();
float y = event.getY();
// Replace these with the correct values (bitmap x, y, width & height)
float x1 = bitmapPositionX;
float x2 = x1 + bitmapWidth;
float y1 = bitmapPositionY;
float y2 = y1 + bitmapHeight;
// Test to see if touch is inside the bitmap
if (x > x1 && x < x2 && y > y1 && y < y2) {
// Bitmap was touched
Log.v("test", "test");
} else {
Log.v("werkt ghil ni", "test");
}
break;
}
return true;
}
static class ChickenView extends SurfaceView implements Runnable {
Thread ourThread = null;
SurfaceHolder ourHolder;
volatile boolean playingSquash;
Paint paint;
public ChickenView(Context context) {
super(context);
init(context);
}
public ChickenView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public ChickenView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
private void init(Context context) {
ourHolder = getHolder();
paint = new Paint();
ballIsMovingDown = true;
}
@Override
public void run() {
while (playingSquash) {
updateCourt();
drawCourt();
controlFPS();
}
}
public void updateCourt() {
//depending upon the two directions we should be
//moving in adjust our x any positions
if (ballIsMovingDown) {
ballPosition.y += 18;
}
//if hits bottom
if (ballPosition.y > screenHeight - 7*ballWidth) {
ballIsMovingDown = false;
}
}
public void drawCourt() {
if (ourHolder.getSurface().isValid()) {
canvas = ourHolder.lockCanvas();
//Paint paint = new Paint();
canvas.drawColor(Color.BLACK);//the background
paint.setColor(Color.argb(255, 255, 255, 255));
paint.setTextSize(45);
canvas.drawText("Score:" + score + " Lives:" + lives + " fps:" + fps, 20, 40, paint);
Bitmap bMapEgg = BitmapFactory.decodeResource(getResources(), R.drawable.egg);
bMapEgg = scaleDown(bMapEgg,180, true);
Bitmap bMapBackground = BitmapFactory.decodeResource(getResources(), R.drawable.backgrounddd);
canvas.drawBitmap(bMapBackground, 0, 0, paint);
canvas.drawBitmap(bMapEgg, ballPosition.x, ballPosition.y, paint);
bitmapPositionX = ballPosition.x;
bitmapPositionY = ballPosition.y;
bitmapWidth = bMapEgg.getWidth();
bitmapHeight = bMapEgg.getHeight();
ourHolder.unlockCanvasAndPost(canvas);
}
}
public void controlFPS() {
long timeThisFrame = (System.currentTimeMillis() - lastFrameTime);
long timeToSleep = 15 - timeThisFrame;
if (timeThisFrame > 0) {
fps = (int) (1000 / timeThisFrame);
}
if (timeToSleep > 0) {
try {
ourThread.sleep(timeToSleep);
} catch (InterruptedException e) {
}
}
lastFrameTime = System.currentTimeMillis();
}
public void pause() {
playingSquash = false;
try {
ourThread.join();
} catch (InterruptedException e) {
}
}
public void resume() {
playingSquash = true;
ourThread = new Thread(this);
ourThread.start();
}
}
@Override
protected void onStop() {
super.onStop();
while (true) {
chickenView.pause();
break;
}
finish();
}
@Override
protected void onResume() {
super.onResume();
chickenView.resume();
}
@Override
protected void onPause() {
super.onPause();
chickenView.pause();
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
chickenView.pause();
finish();
return true;
}
return false;
}
public static Bitmap scaleDown(Bitmap realImage, float maxImageSize,
boolean filter) {
float ratio = Math.min(
(float) maxImageSize / realImage.getWidth(),
(float) maxImageSize / realImage.getHeight());
int width = Math.round((float) ratio * realImage.getWidth());
int height = Math.round((float) ratio * realImage.getHeight());
Bitmap newBitmap = Bitmap.createScaledBitmap(realImage, width,
height, filter);
return newBitmap;
}
}
答案 0 :(得分：1)
问题是，在每个帧中，您都会重新解码并缩放所有位图。
移动位图解码并缩小绘制方法，将其置于初始化方法中并将成员变量（甚至是静态变量）中的已解码和缩放位图存储起来，这样您就可以重复使用它们来绘制每个帧。