我是一个近乎初学者的 android 程序员，我在 surfaceView 类中制作了一个简单的 2D 飞船游戏，您可以用手指控制飞船，并且可以躲避迎面而来的物体。
但是，现在我使用了很多位图，我的游戏似乎有点滞后。
所以我想知道有没有办法在你使用它们后销毁/垃圾图片，所以它们不会造成太多的延迟。（因为我认为，图片造成了滞后）
请告诉我另一种让我的游戏更流畅而没有延迟的简单方法，并请告诉我一些与画布相关的事情，因为我想继续使用 android 画布，而不是使用引擎或 OpenGL
多谢
下面是我的长代码，如果你想检查一下......
package com.zunairgames.zunair;
import java.util.Random;
import android.app.Activity;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.view.WindowManager;
public class GFXSurface extends Activity implements OnTouchListener
{
MyBringBackSurface ourSurfaceView;
float x, y;
boolean testingFinger = false;
@ Override
protected void onCreate (Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate (savedInstanceState);
ourSurfaceView = new MyBringBackSurface (this);
ourSurfaceView.setOnTouchListener (this);
x = 0;
y = 0;
requestWindowFeature (Window.FEATURE_NO_TITLE);
getWindow ().setFlags (WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); /////////////////////////////////////////////////CHECK THIS MIGHT NOT WORK
setContentView (ourSurfaceView); //ourSurfaceView
}
@ Override
protected void onPause ()
{
// TODO Auto-generated method stub
super.onPause ();
ourSurfaceView.pause ();
}
@ Override
protected void onResume ()
{
// TODO Auto-generated method stub
super.onResume ();
ourSurfaceView.resume ();
}
public boolean onTouch (View v, MotionEvent event)
{
// TODO Auto-generated method stub
x = event.getX ();
y = event.getY ();
if (event.getAction () == MotionEvent.ACTION_DOWN)
{
testingFinger = true;
return true;
}
if (event.getAction () == MotionEvent.ACTION_UP)
{
testingFinger = false;
return false;
}
return false;
}
public class MyBringBackSurface extends SurfaceView implements Runnable
{
//vertical
SurfaceHolder ourHolder;
Canvas canvas = (Canvas) ourHolder;
Thread ourThread = null;
boolean isRunning = false;
DisplayMetrics metrics = new DisplayMetrics ();
// getWindowManager().getDefaultDisplay().getMetrics(metrics);
int screenWidth = metrics.widthPixels;
int screenHeight = metrics.heightPixels;
int scrWidth = getWindowManager ().getDefaultDisplay ().getWidth ();
int scrHeight = getWindowManager ().getDefaultDisplay ().getHeight ();
int scrRes = getWindowManager ().getDefaultDisplay ().getPixelFormat ();
Random random = new Random ();
boolean loadStuffPlayGame = false;
boolean loadStuffMenu = false;
boolean onGame = false;
boolean onMenu = true;
boolean onInstruction = false;
int shipX = 0;
int shipY = 0;
int shipWidth = 0;
int shipHeight = 0;
int numStars = 4;
int starX[] = new int [numStars];
int starY[] = new int [numStars];
int starWidth = 0;
int starHeight = 0;
int starSpeed[] = new int [numStars];
int score = 0;
int backgroundY = 0;
Bitmap menuScreenBackground;
Bitmap playGameButton;
Bitmap instructionButton;
//playGamePictures////
Bitmap spaceship;
Bitmap background;
Bitmap starPic;
///end of playGame Pics//
public MyBringBackSurface (Context context)
{
// TODO Auto-generated constructor stub
super (context);
ourHolder = getHolder ();
}
public void pause ()
{
isRunning = false;
while (true)
{
try
{
ourThread.join ();
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace ();
}
break;
}
ourThread = null;
}
public void resume ()
{
isRunning = true;
ourThread = new Thread (this);
ourThread.start ();
}
public int dpToPx (int dp)
{
DisplayMetrics displayMetrics = getContext ().getResources ().getDisplayMetrics ();
int px = Math.round (dp * (displayMetrics.xdpi / DisplayMetrics.DENSITY_DEFAULT));
return px;
}
public int round (double d)
{
double dAbs = Math.abs (d);
int i = (int) dAbs;
double result = dAbs - (double) i;
if (result < 0.5)
{
return d < 0 ? -i:
i;
}
else
{
return d < 0 ? -(i + 1):
i + 1;
}
}
public Bitmap getResizedBitmap (Bitmap bm, int newWidth, int newHeight)
{
int width = bm.getWidth ();
int height = bm.getHeight ();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// create a matrix for the manipulation
Matrix matrix = new Matrix ();
// resize the bit map
matrix.postScale (scaleWidth, scaleHeight);
// recreate the new Bitmap
Bitmap resizedBitmap = Bitmap.createBitmap (bm, 0, 0, width, height, matrix, false);
return resizedBitmap;
}
public void run ()
{
// TODO Auto-generated method stub
while (isRunning)
{
if (!ourHolder.getSurface ().isValid ())
continue;
canvas = ourHolder.lockCanvas ();
Paint paint = new Paint ();
paint.setColor (Color.GREEN);
paint.setTextSize (45);
if (onMenu == true)
{
if (loadStuffMenu == false)
{
menuScreenBackground = BitmapFactory.decodeResource (getResources (), R.drawable.menuscreen);
playGameButton = BitmapFactory.decodeResource (getResources (), R.drawable.menuplaygame);
instructionButton = BitmapFactory.decodeResource (getResources (), R.drawable.menuinstruction);
menuScreenBackground = getResizedBitmap (menuScreenBackground, canvas.getWidth (), canvas.getHeight ());
playGameButton = getResizedBitmap (playGameButton, round (canvas.getWidth () / 1.3), canvas.getHeight () / 8);
instructionButton = getResizedBitmap (instructionButton, round (canvas.getWidth () / 1.3), canvas.getHeight () / 8);
loadStuffMenu = true;
}
canvas.drawARGB (23, 3, 4, 4);
canvas.drawBitmap (menuScreenBackground, 0, 0, null);
paint.setTextSize (20);
paint.setColor (Color.WHITE);
canvas.drawText ("By: Zunair Syed", round (canvas.getWidth () / 1.5), round (canvas.getHeight () / 1.05), paint);
if (x > dpToPx (15) && x < dpToPx (305) && y > dpToPx (190) && y < dpToPx (250))
{
onMenu = false;
onGame = true;
}
else if (x > dpToPx (15) && x < dpToPx (305) && y > dpToPx (270) && y < dpToPx (335))
{
paint.setColor (Color.BLUE);
canvas.drawCircle (20, 50, 100, paint);
}
else if (x > dpToPx (17) && x < dpToPx (305) && y > dpToPx (355) && y < dpToPx (420))
{
paint.setColor (Color.GREEN);
canvas.drawCircle (20, 50, 100, paint);
}
}
else if (onGame == true)
{
shipX = round (x) - (round (shipWidth / 2));
shipY = round (y) - (round (shipHeight / 2));
if (loadStuffPlayGame == false)
{
shipX = round (canvas.getWidth () / 2);
shipY = round (canvas.getHeight () / 2);
shipWidth = canvas.getWidth () / 5;
shipHeight = canvas.getHeight () / 8;
starWidth = canvas.getWidth () / 10;
starHeight = canvas.getHeight () / 20;
for (int i = 0 ; i < numStars ; i++)
{
starY [i] = -random.nextInt ((canvas.getHeight () / 4));
starX [i] = random.nextInt (canvas.getWidth () - (starWidth));
starSpeed [i] = 1 + random.nextInt (5);
}
spaceship = BitmapFactory.decodeResource (getResources (), R.drawable.spaceship);
background = BitmapFactory.decodeResource (getResources (), R.drawable.background);
starPic = BitmapFactory.decodeResource (getResources (), R.drawable.star);
spaceship = getResizedBitmap (spaceship, dpToPx (shipWidth), dpToPx (shipHeight));
background = getResizedBitmap (background, (canvas.getWidth ()), (canvas.getHeight ()) * 2);
starPic = getResizedBitmap (starPic, dpToPx (starWidth), dpToPx (starHeight));
backgroundY = -(canvas.getHeight ());
x = canvas.getWidth () / 2;
y = canvas.getHeight () / 2;
loadStuffPlayGame = true;
}
for (int i = 0 ; i < numStars ; i++)
{
starY [i] += starSpeed [i];
if (starY [i] > canvas.getHeight ())
{
starY [i] = -random.nextInt ((canvas.getHeight () / 4));
starX [i] = random.nextInt (canvas.getWidth () - starWidth);
starSpeed [i] = starSpeed [i] + random.nextInt (2);
}
if (shipX + shipWidth > starX [i] && shipX < starX [i] + starWidth && shipY + shipHeight > starY [i] && shipY < starY [i] + starHeight)
{
starY [i] = -random.nextInt ((canvas.getHeight () / 4));
starX [i] = random.nextInt (canvas.getWidth () - starWidth);
starSpeed [i] = 1 + random.nextInt (10);
score++;
}
}
backgroundY++;
if (backgroundY > -10)
{
backgroundY = -canvas.getHeight ();
}
canvas.drawRGB (3, 120, 12);
canvas.drawBitmap (background, 0, backgroundY, null);
for (int i = 0 ; i < numStars ; i++)
{
canvas.drawBitmap (starPic, starX [i], starY [i], null);
}
/* canvas.drawText("SCORE : "+ score + "DENSITY :"+ canvas.getDensity() +" screenWidth :"+scrWidth,0, 100, paint);
canvas.drawText("ScreenHight:" + scrHeight +" scrRes" + scrRes + "20 pixels ="+dpToPx(20) ,0, 150, paint);
*/
canvas.drawText ("SCORE :" + score, canvas.getWidth () / 2 - (canvas.getWidth () / 7), canvas.getHeight () / 80 + canvas.getHeight () / 30, paint);
canvas.drawBitmap (spaceship, shipX, shipY, null); //1/3 of screen
}
else if (onInstruction == true)
{
}
//72
ourHolder.unlockCanvasAndPost (canvas);
}
}
}
}