边做游戏边学android—2（飞机大战①创建飞机）

将飞机的素材，放在res/drawable-mdpi文件夹下，

创建物品对象的类：

package com.example.object;

import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Paint;

abstract public class GameObject {
    protected int currentFrame;
    protected int speed;
    protected float object_x;
    protected float object_y;
    protected float object_height;
    protected float object_width;
    protected float screen_width;
    protected float screen_height;
    protected boolean isAlive;
    protected Paint paint;
    protected Resources resources;

    public GameObject(Resources resources) {
        this.resources = resources;
        this.paint = new Paint();
    }

    public void setScreenWH(float screen_width, float screen_height){
        this.screen_width = screen_width;
        this.screen_height = screen_height; 
    }

    public void initial(int arg0, float arg1, float arg2){

    }
    protected abstract void initBitmap();
    public abstract void drawSelf(Canvas canvas);
    public abstract void release();
    public boolean isCollide(GameObject obj) {
        return true;
    }

    public void logic(){

    }

    public int getSpeed() {
        return speed;
    }

    public void setSpeed(int speed) {
        this.speed = speed;
    }

    public float getObject_x() {
        return object_x;
    }

    public void setObject_x(float object_x) {
        this.object_x = object_x;
    }

    public float getObject_y() {
        return object_y;
    }

    public void setObject_y(float object_y) {
        this.object_y = object_y;
    }

    public float getObject_height() {
        return object_height;
    }

    public void setObject_height(float object_height) {
        this.object_height = object_height;
    }

    public float getObject_width() {
        return object_width;
    }

    public void setObject_width(float object_width) {
        this.object_width = object_width;
    }

    public boolean isAlive() {
        return isAlive;
    }

    public void setAlive(boolean isAlive) {
        this.isAlive = isAlive;
    }



}

创建飞机类。继承物品类：

package com.example.object;

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;

import com.example.planewars.R;
import com.example.view.MainView;

import com.example.interfaces.IMyPlane;

public class MyPlane extends GameObject {
    private float middle_x;
    private float middle_y;
    private Bitmap myplane;
    private Bitmap myplaneexplosion;
    private MainView mainView;

    public MyPlane(Resources resources) {
        super(resources);
        // TODO Auto-generated constructor stub
        initBitmap();
    }

    public void setMainView(MainView mainView) {
        this.mainView = mainView;
    }

    public void setScreenWH(float screen_width, float screen_height) {
        super.setScreenWH(screen_width, screen_height);
        object_x = screen_width/2 - object_width/2;
        object_y = screen_height - object_height;
        middle_x = object_x + object_width/2;
        middle_y = object_y + object_height/2;
    }

    @Override
    protected void initBitmap() {
        // TODO Auto-generated method stub
        myplane = BitmapFactory.decodeResource(resources, R.drawable.myplane);
        myplaneexplosion = BitmapFactory.decodeResource(resources, R.drawable.myplaneexplosion);
        object_width = myplane.getWidth()/2;
        object_height = myplane.getHeight();
    }

    @Override
    public void drawSelf(Canvas canvas) {
        canvas.save();
        canvas.clipRect(object_x, object_y,object_x + object_width, object_y + object_height);
        canvas.drawBitmap(myplane, object_x  , object_y, paint);
        canvas.restore();

    }

    @Override
    public void release() {
        // TODO Auto-generated method stub
        if(!myplane.isRecycled()){
            myplane.recycle();
        }
        if(!myplaneexplosion.isRecycled()){
            myplaneexplosion.recycle();
        }
    }

    public float getMiddle_x() {
        return middle_x;
    }

    public void setMiddle_x(float middle_x) {
        this.middle_x = middle_x;
    }

    public float getMiddle_y() {
        return middle_y;
    }

    public void setMiddle_y(float middle_y) {
        this.middle_y = middle_y;
    }


}

创建工厂类，用于创建游戏中的各种物品：

package com.example.factory;

import android.content.res.Resources;

import com.example.object.GameObject;
import com.example.object.MyPlane;

public class GameObjectFactory {
    public GameObject createMyPlane(Resources resources){
        return new MyPlane(resources);
    }

}

创建显示的类。

package com.example.view;

import com.example.planewars.MainActivity;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class BaseView extends SurfaceView implements SurfaceHolder.Callback,Runnable {


    protected int currentFrame;
    protected float scalex;
    protected float scaley;
    protected float screen_width;
    protected float screen_height;
    protected boolean threadFlag;
    protected Paint paint;
    protected Canvas canvas;
    protected Thread thread;
    protected SurfaceHolder sfh;
    //protected GameSoundPool sounds;
    protected MainActivity mainActivity;

    public BaseView(Context context) {
        super(context);
        this.mainActivity = (MainActivity) context;
        sfh = this.getHolder();
        sfh.addCallback(this);
        paint = new Paint();
    }

    public void surfaceChanged(SurfaceHolder arg0, int arg1,int arg2, int arg3){

    }

    public void surfaceCreated(SurfaceHolder arg0) {
        screen_width = this.getWidth();
        screen_height = this.getHeight();
        threadFlag = true;
    }

    public void surfaceDestroyed(SurfaceHolder arg0){
        threadFlag = false;
    }

    public void initBitmap(){

    }

    public void release(){

    }

    public void drawSelf(){

    }

    public void run(){

    }

    public void setThreadFlag(boolean threadFlag){
        this.threadFlag = threadFlag;
    }

}

创建主界面，继承显示类：

package com.example.view;

import android.content.Context;
import android.graphics.Color;
import android.os.Message;
import android.view.SurfaceHolder;

import com.example.object.MyPlane;
import com.example.factory.GameObjectFactory;
public class MainView extends BaseView{
    private MyPlane myPlane;
    private GameObjectFactory factory;
    private boolean isPlay;

    public MainView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
        factory = new GameObjectFactory();
        myPlane = (MyPlane) factory.createMyPlane(getResources());
        myPlane.setMainView(this);
        thread = new Thread(this);
    }

    public void surfaceCreated(SurfaceHolder arg0){
        super.surfaceCreated(arg0);
        initBitmap();
        myPlane.setScreenWH(screen_width, screen_height);
        myPlane.setAlive(true);
        if(thread.isAlive()){
            thread.start();
        } else {
            thread = new Thread(this);
            thread.start();
        }

    }

    public void surfaceDestoryed(SurfaceHolder arg0){
        super.surfaceDestroyed(arg0);
        release();
    }

    public void initBitmap(){

    }
    public void initObject(){

    }

    public void drawSelf(){
        try{
            canvas = sfh.lockCanvas();
            canvas.drawColor(Color.BLACK);
            canvas.save();
            myPlane.drawSelf(canvas);
            } finally{
                if(canvas != null);
                sfh.unlockCanvasAndPost(canvas);
            }
    }

    public void viewLogic(){

    }

    public void run(){
        while(threadFlag){
            long startTime = System.currentTimeMillis();
            initObject();
            drawSelf();
            viewLogic();
            long endTime = System.currentTimeMillis();
            if(!isPlay){
                synchronized(thread){
                    try{
                        thread.wait();
                    } catch(InterruptedException e){
                        e.printStackTrace();
                    }
                }
            }

            try{
                if(endTime - startTime <100){
                    Thread.sleep(100-(endTime - startTime));
                } 
            } catch(InterruptedException e ){
                e.printStackTrace();
            }


        }
        try{
            Thread.sleep(1000);
        } catch(InterruptedException e ) {
            e.printStackTrace();
        }
    }

}

运行结果如下图：

这里用surfaceView 。bitmap、canvas。创建飞机使用的是工厂模式。