Android 遊戲開發----【搭建遊戲開發框架】

首先來一個Activity

package com.himi;

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

public class ImageTest extends Activity {
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(new MySurfaceView(this));
	}
}

接下來是Activyt的View。

注----SurfaceView 是View的子類，也是android對View的加強。其中surfaceView底層用的是雙緩衝機制。

下面的程序主要是通過實現runnable接口，讓draw方法在線程中執行。當然這裏的draw不會自己被調用。

package bsn.cc.dd;


import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.SlidingDrawer;
//注：實現runnable 只有加入Thread thread=new Thread(this);纔會去執行runnable中的方法。以爲runnable中的run 方法必須放到線程裏
public class MySurfaceView extends SurfaceView implements android.view.SurfaceHolder.Callback,Runnable{
	private int SW,SH;
	private Bitmap bitmap;
	private Resources rs;
	private Paint paint;
	private int robotx=100;
	private int roboty=100;
	private SurfaceHolder sfh;
	private Canvas canvas;
	private Thread thread=new Thread(this);

	public MySurfaceView(Context context) {
		super(context);
		//保持屏幕一直亮
		  this.setKeepScreenOn(true);
		  rs=this.getResources();
	      bitmap=BitmapFactory.decodeResource(rs, R.drawable.enemy1);
	      sfh=this.getHolder();
	      sfh.addCallback(this);
	      paint=new Paint();
	      paint.setColor(Color.BLUE);
	      //設置無鋸齒
	      paint.setAntiAlias(true);
	      setFocusable(true);//用來響應按鍵
	}
	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		//如果在初始化的時候獲得寬和高將返回0，因爲這裏的MySurfaceView是繼承SurfaceView的，SurfaceView只有通過重寫surfaceCreated的
		//時候View纔是有值的。
		  SW=this.getWidth();
	      SH=this.getHeight();
	     thread.start();
	      
	      
	}
	@Override
	public void run() {
		System.out.println("------------");
		draw();
		try {
			Thread.sleep(100);
		} catch (Exception e) {
			// TODO: handle exception
		}
	}

	public void draw(){
	     canvas=sfh.lockCanvas();//自己理解是鎖到畫布開始畫
	      canvas.drawRect(0, 0, SW, SH, paint);
	      canvas.save();  
	      canvas.clipRect(robotx, roboty, robotx+(bitmap.getWidth()/13), roboty+bitmap.getHeight());
	      
	      canvas.restore();
	      //釋放畫布鎖。並顯示出畫布。
	      sfh.unlockCanvasAndPost(canvas);.//ok 之後顯示畫布。這裏的save和restore 是一對， lockCanvas和unlockCanvasAndPost是一對
	}
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		// TODO Auto-generated method stub
		return super.onKeyDown(keyCode, event);
	}
	@Override
	public boolean onKeyUp(int keyCode, KeyEvent event) {
		// TODO Auto-generated method stub
		return super.onKeyUp(keyCode, event);
		
	}
	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
		
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		
	}



}

注--    sfh=this.getHolder();
     sfh.addCallback(this);是通過getHolder() 來管理sufaceView 。程序中紅色字體標示了出來.只有把這兩句加上程序纔會運行都run。。。