android - 如何在不降低性能的情况下在 Android 游戏的屏幕上绘制大量位图

Question

我想为 android 制作一个基于图 block 的游戏。目前我正在将每个图 block 绘制为单独的位图。我有一个很大的 for 循环，它从一个字符串中读取并根据它找到的绘制关卡的字符绘制不同的图 block 。

我允许用户使用滚动手势滚动屏幕。但是游戏速度太慢了。用户滚动后需要很长时间才能更新屏幕。我认为这是因为它必须单独绘制每个图 block 的位图。

什么是绘制关卡的更快方法？我在想我可以将所有的图 block 合并成一个位图。但我不知道该怎么做。有什么想法吗？

无论如何，这是我的代码，因此您可以看到问题所在:

package org.example.tutorial2d;

import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.GestureDetector.OnGestureListener;

import org.example.tutorial2d.Panel;

public class Tutorial2D extends Activity implements OnGestureListener {

GestureDetector gestureScanner;
Panel main;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    gestureScanner = new GestureDetector(this);

    //requestWindowFeature(Window.FEATURE_NO_TITLE);       
    main = new Panel(this);
    setContentView(main);       

}

@Override
public boolean onTouchEvent(MotionEvent me)
{
 return gestureScanner.onTouchEvent(me);
}

@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
{
 main.handleScroll(distanceX,distanceY);
 return true;
}

////////////////////
///////////////////
//////////////////
@Override
public boolean onDown(MotionEvent e)
{
 return true;
}

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
{
 return true;
}

@Override
public void onLongPress(MotionEvent e){    }

@Override
public void onShowPress(MotionEvent e) {   }    

@Override
public boolean onSingleTapUp(MotionEvent e)    
{
 return true;
}
////////////////////
///////////////////
//////////////////
}

以及完成所有工作的类:

package org.example.tutorial2d;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.View;
import org.example.tutorial2d.Point;

public class Panel extends View {

private int scrollX = 0;
private int scrollY = 0;

public Panel(Context context)
{
    super(context);
}

@Override
public void onDraw(Canvas canvas)
{
    /*Bitmap scratch;
    //Drawable scratch;
    //scratch = getContext().getResources().getDrawable(
    //        R.drawable.icon);
    canvas.drawColor(Color.BLACK);
    //scratch.draw(canvas);
    int origin = 0;
    scratch = BitmapFactory.decodeResource(getResources(), R.drawable.horizontal5);
    canvas.drawBitmap(scratch, origin, origin, null);
    int width = scratch.getWidth();
    int height = scratch.getHeight();
    scratch = BitmapFactory.decodeResource(getResources(), R.drawable.room4entrynesw3x3);
    canvas.drawBitmap(scratch, origin + width, origin - 32, null);
    */

    String sucide_mission = 
"                  wwwww\n" +
"                  wfffw\n" +
"                  wfffw\n" +
"                  wfffw\n" + 
"                  wwfww\n" +
"                   wfw\n" + 
"                   wfw\n" +
"                   wfw\n" +
"             wwwwwwwfwwwwwfw\n" +
"             wfffffffffffffw\n" +
"             wfwwwwwfwwwwwfw\n" +
"     wwwww   wfw   wfw   wfw\n" +
"wwwwwwfffwwwwwfwwwwwfwwwwwfw\n" +
"fffffffffffffffffffffffffffw\n" +
"wwwwwwfffwwwwwwwwwwwfwwwwwfw\n" +
"     wwfww         wfw\n" +
"      wfw          wfw\n" +
"      wfw          wfw\n" +
"      wfw          wfw\n" +
"      wfw          wfw\n" +
"     wwfww         wfw\n" +
"     wfffwwfw      fff\n" +
"     wffffffw      www\n" +
"     wfffwwfw\n" +
"     wwwww";

    canvas.drawColor(Color.BLACK);
    int x = 0, y = 0;

    for (int i = 0; i < sucide_mission.length(); i++)
    {
        Bitmap tileImage;
        char tile = sucide_mission.charAt(i);

        Log.d("Draw tiles", Character.toString(tile) + " " + x + "," + y);

        switch (tile)
        {
            case 'w':
                if (x < tileImage = BitmapFactory.decodeResource(getResources(), R.drawable.walla);
                canvas.drawBitmap(tileImage, x - scrollX, y - scrollY, null);
                x += 32;
                break;
            case 'f':
                tileImage = BitmapFactory.decodeResource(getResources(), R.drawable.floore);
                canvas.drawBitmap(tileImage, x - scrollX, y - scrollY, null);
                x += 32;
                break;
            case ' ':
                x += 32;
                break;
            case '\n':
                y += 32;
                x = 0;
                break;
        }

    }

    //canvas.drawBitmap(adapt, 0, 0, paint);
    //canvas.drawBitmap(corner, origin -scrollX , origin -scrollY, paint);

}

 public void handleScroll(float distX, float distY)
 {
      // X-Axis ////////////////////////////////

      if(distX > 6.0)
      {
           if(scrollX < 460)
           {
                scrollX += 30;
           }
      }
      else if(distX < -6.0)
      {
           if(scrollX >= 30)
           {
                scrollX -= 30;
           }
      }
      ////////////////////////////////////////////

      // Y-AXIS //////////////////////////////////
      if(distY > 6.0)
      {
           if(scrollY < 100)
           {
                scrollY += 30;
           }
      }
      else if(distY < -6.0)
      {
           if(scrollY >= 30)
           {
                scrollY -= 30;
           }
      }              
      ////////////////////////////////////////////

      if((scrollX <= 480) && (scrollY <= 120))
      {
           //adapt = Bitmap.createBitmap(bmp, scrollX, scrollY, 320, 480);
           invalidate();
      }
 }
}

Answer 1

看起来您正在为渲染的每个图 block 创建每个位图图像的新实例。也许您可以为每种图 block 类型创建一个实例而不是那样做？例如:

private Bitmap wallTile = BitmapFactory.decodeResource(getResources(), R.drawable.walla);
private Bitmap floorTile = BitmapFactory.decodeResource(getResources(), R.drawable.floore);

然后在每次绘制图 block 时重复使用同一个图 block 实例。如果这不起作用，您应该进行某种性能测量以查看代码的哪一部分花费的时间最长，并尽量减少代码的运行次数，或者尝试将其精简。

免责声明:我不是Android程序员