Question

我正在尝试将精灵图像设置为背景并且我没有成功将图像大小设置为屏幕尺寸。

我正在尝试这个：

public class Game extends SurfaceView implements Runnable {
    private SurfaceHolder holder;
    private boolean isRunning = false;
    private Thread gameThread;
    private Sprite s;
    private int screenWidth;
    private int screenHeight;
    Canvas canvas;
    //  private Sprite[] sprites;

    private final static int MAX_FPS = 40; //desired fps
    private final static int FRAME_PERIOD = 1000 / MAX_FPS; // the frame period

    public Game(Context context) {
        super(context);

        holder = getHolder();
        holder.addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
                screenWidth = width;
                screenHeight = height;
            }

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
            }
        });

        //====== not working
        //  Display display = ((Activity)context).getWindowManager().getDefaultDisplay();
        //   int sWidth = display.getWidth();
        // int sHeight = display.getHeight();

        //====== not working
        //   DisplayMetrics dm = new DisplayMetrics();
        //  ((Activity)context).getWindowManager().getDefaultDisplay().getMetrics(dm);
        // int sWidth = dm.widthPixels;
        // int sHeight = dm.heightPixels;

        //====== not working
        // screenHeight=canvas.getHeight();
        // screenWidth=canvas.getWidth();

        s=new Sprite(0, 0, BitmapFactory.decodeResource(this.getResources(), R.mipmap.back));
    }

    /**
     * Start or resume the game.
     */
    public void resume() {
        isRunning = true;
        gameThread = new Thread(this);
        gameThread.start();
    }

    /**
     * Pause the game loop
     */
    public void pause() {
        isRunning = false;
        boolean retry = true;
        while (retry) {
            try {
                gameThread.join();
                retry = false;
            } catch (InterruptedException e) {
                // try again shutting down the thread
            }
        }
    }

    class Sprite {
        int x;
        int y;
        int directionX = 1;
        int directionY = 1;
        int speed = 10;
        int color = 0;
        Bitmap image;

        public Sprite(int x, int y) {
            this.x = x;
            this.y = y;
        }

        public Sprite(int x, int y, Bitmap image) {
            this(x, y);
            this.image = image;
        }

        public Sprite(int x, int y, Bitmap image, int color) {
            this(x, y, image);
            this.color = color;
        }
    }

    protected void step()
    {
        //blablabla
    }

    protected void render(Canvas canvas) {
        canvas.drawColor(Color.BLACK);
        Paint p = new Paint();

        canvas.drawBitmap(s.image,s.x,s.y,p);

    }

    @Override
    public void run() {
        while(isRunning) {
            // We need to make sure that the surface is ready
            if (! holder.getSurface().isValid()) {
                continue;
            }
            long started = System.currentTimeMillis();

            // update
            step();
            // draw
            canvas = holder.lockCanvas();

            if (canvas != null) {
                render(canvas);
                holder.unlockCanvasAndPost(canvas);
            }

            float deltaTime = (System.currentTimeMillis() - started);
            int sleepTime = (int) (FRAME_PERIOD - deltaTime);
            if (sleepTime > 0) {
                try {
                    gameThread.sleep(sleepTime);
                }
                catch (InterruptedException e) {
                }
            }
            while (sleepTime < 0) {
                step();
                sleepTime += FRAME_PERIOD;
            }
        }
    }
}

这个选项不起作用：

//====== not working
//  Display display = ((Activity)context).getWindowManager().getDefaultDisplay();
//   int sWidth = display.getWidth();
// int sHeight = display.getHeight();

//====== not working
//   DisplayMetrics dm = new DisplayMetrics();
//  ((Activity)context).getWindowManager().getDefaultDisplay().getMetrics(dm);
// int sWidth = dm.widthPixels;
// int sHeight = dm.heightPixels;

//====== not working
// screenHeight=canvas.getHeight();
// screenWidth=canvas.getWidth();

那么我如何获得画布或当前屏幕尺寸？并将Sprite.image设置为全屏？

Answer 1

尝试以像素为单位的尺寸

Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;

Answer 2

解码位图时尝试此操作。

    final int width = context.getResources().getDisplayMetrics().widthPixels;
    final int height = context.getResources().getDisplayMetrics().heightPixels;

    BitmapFactory.Options options = new BitmapFactory.Options();
    options.outHeight = height;
    options.outWidth = width;

    Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_launcher, options)

如何获得屏幕尺寸？

2 个答案: