Android游戏开发学习(2)--SurfaceView实例控制角色移动

先看效果

 

 

 

我用到的图片-

 

在看代码

 

package dk.game;

import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //去掉标题
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        //全屏显示
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(new GameView(this));
    }
}

 

package dk.game;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.Log;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class GameView extends SurfaceView implements Runnable,SurfaceHolder.Callback {
	//刷屏主线程
	private Thread gameThread;
	//游戏屏幕宽和高
	public static int screen_width,screen_height;
	private Paint paint;
	private Canvas canvas;
	private SurfaceHolder sfh;
	private boolean run_flag=false;
	//敌人图片
	private Bitmap bmp_enemy;
	//移动速度
	private int enemy_speed=5;
	//角色移动控制帧
	private int frame=0;
	//按键上下左右移动的判断
	private boolean is_up,is_down,is_left,is_right;
	//上下左右移动动画帧编号
	private int[] enemy_up={3,4,5};
	private int[] enemy_down={0,1,2};
	private int[] enemy_left={6,7,8};
	private int[] enemy_right={9,10,11};
	//当前帧动画
	private int[] enemy_start=enemy_down;
	//初始角色单帧图片右上角位置和单帧图片宽和高
	//右上角位置作为图片的人物的控制点不太合适
	//private int X=50,Y=50,W,H;
	
	//人物的控制点坐标和宽高
	private int X,Y,W,H;

	public GameView(Context context) {
		super(context);
		sfh=getHolder();
		sfh.addCallback(this);
		
		paint =new Paint();
		paint.setAntiAlias(true);
		//获得焦点
		setFocusable(true);
		setClickable(true);
		setFocusableInTouchMode(true);
		//保持屏幕常亮
		setKeepScreenOn(true);
		
		bmp_enemy=BitmapFactory.decodeResource(getResources(), R.drawable.enemy);
		W=bmp_enemy.getWidth()/13;	
		H=bmp_enemy.getHeight();
		//这里我以单帧图片的中心点为控制点。具体控制点的位置，主要看你的图片了
		X=X+W/2;
		Y=Y+Y/2;
	}
	
	public void draw(Canvas canvas,Paint paint){
		
		/*  第一种绘制方法                  */
		/*
		canvas.drawColor(Color.GRAY);
		//屏幕显示区域
		Rect rect_dst=new Rect(X-W/2, Y-H/2, X+W/2, Y+H/2);
		//图片截取区域
		Rect rect_src=new Rect(enemy_start[frame]*W, 0, (enemy_start[frame]+1)*W, H);
		canvas.drawBitmap(bmp_enemy,rect_src,rect_dst,paint);
		*/
		
		/*  第二种绘制方法                  */
		canvas.save();
		canvas.drawColor(Color.GRAY);
		//设置可视区域
		canvas.clipRect(X-W/2, Y-H/2, X+W/2, Y+H/2);
		canvas.drawBitmap(bmp_enemy,X-enemy_start[frame]*W-W/2,Y-H/2,paint);
		canvas.restore();
	}
	
	public void logic(){
		//根据按键状态判断
		if(is_up){
			Y-=enemy_speed;
		}else if(is_down){
			Y+=enemy_speed;
		}else if(is_left){
			X-=enemy_speed;
		}else if(is_right){
			X+=enemy_speed;
		}
		//边界暂时先不判断
		if(X<0){
			X=0;
		}
		if(Y<0){
			Y=0;
		}
		if(X>screen_width){
			X=screen_width;
		}
		if(Y>screen_height){
			Y=screen_height;
		}
		
		
		//移动动画帧的处理
		if((is_up || is_down||is_left ||is_right)|| frame!=0){
			if(frame<2){
				frame++;
			}else{
				frame=0;
			}
		}
		
	}
	
	
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if(keyCode==KeyEvent.KEYCODE_DPAD_UP){
			is_up=true;
			enemy_start=enemy_up;
		}else if(keyCode==KeyEvent.KEYCODE_DPAD_DOWN){
			is_down=true;	
			enemy_start=enemy_down;
		}else if(keyCode==KeyEvent.KEYCODE_DPAD_LEFT){
			is_left=true;
			enemy_start=enemy_left;
		}else if(keyCode==KeyEvent.KEYCODE_DPAD_RIGHT){
			is_right=true;
			enemy_start=enemy_right;
		}
		return super.onKeyDown(keyCode, event);
	}
	
	@Override
	public boolean onKeyUp(int keyCode, KeyEvent event) {
		is_up=false;
		is_down=false;
		is_left=false;
		is_right=false;
		return super.onKeyUp(keyCode, event);
	}
	
	
	@Override
	public void run() {
		while (run_flag) {
			try {
				long startTime=System.currentTimeMillis();
				canvas=sfh.lockCanvas();
				logic();
				draw(canvas, paint);
				long endTime=System.currentTimeMillis();
				long useTime=endTime-startTime;
				//固定屏幕刷新的时间为50ms
				if(useTime<50){
					Thread.sleep(50-useTime);
				}
			} catch (Exception e) {
				Log.e("Error", "刷屏线程出错了"+e);
			}finally{
				if(canvas!=null){
					sfh.unlockCanvasAndPost(canvas);
				}
			}
			
		}
	}
	
	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		screen_width=getWidth();
		screen_height=getHeight();
		gameThread=new Thread(this);
		run_flag=true;
		//启动线程
		gameThread.start();
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		run_flag=false;
		try {
			gameThread.join();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}

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

}

 

 

 

最后源码下载 ： http://dl.iteye.com/topics/download/638556d9-97b2-3bd9-a7b7-13588b3eb8b5