java - 如何为 Android 游戏加载位图？

Question

我一直在开发一个没有位图或任何东西的游戏，我使用矩形作为对象，并根据其目的更改它们的颜色，例如玩家的红色矩形和墙壁的灰色矩形。我的问题是用位图/图像替换矩形的正确方法是什么？

我知道要加载位图，您可以这样做:

Bitmap randomBitmap = BitmapFactory.decodeResource(getResources(),
com.example.android4gametest.R.drawable.ic_launcher);

我应该加载所有位图并将它们传递给它们的类，还是应该加载它们的类中的位图而不是传递它？我该怎么做，因为我无法使用 BitmapFactory，因为我无法访问 getResources()!或者我应该从我的 Assets 文件夹加载我的位图/图像，我知道我不会有相同的“工具”，你可以说它会弄乱位图。

主要 Activity

public class MainActivity extends Activity {
Game theGame;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
    WindowManager.LayoutParams.FLAG_FULLSCREEN);

    setContentView(new Game(this));
}
}

游戏面板 公共(public)类 Game 扩展 SurfaceView 实现 SurfaceHolder.Callback {

GameThread _thread;

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

    getHolder().addCallback(this);

    setFocusable(true);

    _thread = new GameThread(getHolder(), this);


}

public void surfaceChanged(SurfaceHolder holder, int format, int width,
        int height) {
    // TODO Auto-generated method stub

}

public void surfaceCreated(SurfaceHolder holder) {
    _thread.setRunning(true);
    _thread.start();

}

public void surfaceDestroyed(SurfaceHolder holder) {
    // TODO Auto-generated method stub

}

@Override
protected void onDraw(Canvas canvas) {
    Log.d("OnDraw", "it is Drawing");
    canvas.drawColor(Color.BLUE);
}

public void update() {
    // TODO Auto-generated method stub  
}
}

GameLoop 这里什么都没有

    public class GameThread extends Thread{
/*FPS Code*/
private final static int MAX_FPS = 30;
private static final int FRAME_PERIOD = 1000/MAX_FPS;




protected SurfaceHolder holder;
protected Game game;
private boolean isRunning = false;

public GameThread(SurfaceHolder _holder, Game _game) {
    this.holder = _holder;
    this.game = _game;
}



/**
 * Returns True if the game is still running and False if the game is over
 * @return
 */
public boolean isRunning() {
    return isRunning;
}
/**
 * Set to true for the game loop to start 
 * @param isRunning
 */
public void setRunning(boolean isRunning) {
    this.isRunning = isRunning;
}


@Override
public void run() {
    Canvas c;
    Log.d("Pallyways", "Starting game Loop");

    long beingTime;
    long timeDiff;
    int sleepTime;
    int framesSkipped;

    sleepTime = 0;

    while(isRunning){
        c = null;
        try{

            c = holder.lockCanvas();
            synchronized(holder){
                beingTime = System.currentTimeMillis();
                framesSkipped = 0;
                game.update();//Update
                game.onDraw(c);//Redraw

                timeDiff = System.currentTimeMillis() - beingTime ;
                sleepTime = (int) (FRAME_PERIOD - timeDiff);

                if(sleepTime>0){
                    try{
                        Thread.sleep(sleepTime);} 
                    catch (InterruptedException e) {
                        e.printStackTrace();}
                    finally{}
                }

                while(sleepTime<0 && framesSkipped < 5){
                    game.update();

                    sleepTime+= FRAME_PERIOD;
                    framesSkipped++;
                }

            }
        }finally{if(c!=null){
            holder.unlockCanvasAndPost(c);
        }
        }
    }
}

}

英雄类我还没有开始，但我想知道如何在不同包上的类上加载位图

package com.example.android4gametest.Actors;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import com.example.android4gametest.R;

public class Hero {
//getContext() gives me an error and that is because it does not have a reference

private Bitmap hero = BitmapFactory.decodeResource(getContext().getResources(),
R.drawable.ic_launcher);
public Hero(){

}}

Answer 1

根据位图的大小/数量，将它们加载到 Game 类的构造函数中可能没问题。但请注意，如果您一次将太多/太大的位图加载到内存中，则可能会在第一次绘制调用时遇到一些 OOM 错误或滞后。您必须确保在不再需要位图时有效地清空并回收它们。我的第一款游戏就遇到了这个问题