初学者的漫步拾忆SurfaceView

小灰灰 2022-06-12 01:37 88阅读 0赞

学习编程两年了.  
我却始终在和switch语句,界面UI做斗争.  
学过不少东西,不过还是毛都不懂.  
或者说我已经从入门到放弃了吧.

可笑啊.  
不甘堕落却又不思进取.  
懒惰却总像是潜藏在身体的瘾,稍有怠慢便上了瘾.  
惶恐,不安,百无聊赖.

好了,梳理了下心情,开始干正事.

分享学习到的基础小案例,涉及到SurfaceView ,SurfaceHolder,Surface,Thread方面的知识.  
想学习的同学可以滑动页面到最底部.

![这里写图片描述][SouthEast]

![这里写图片描述][SouthEast 1]

MainActivity

package com.example.luokexi.gameuidayone;
    
    import android.app.Activity;
    import android.os.Bundle;
    import android.view.MotionEvent;
    
    public class MainActivity extends Activity { 
    
        private GameUI gameUI;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            //no title
            //requestWindowFeature(Window.FEATURE_NO_TITLE);
            //no bar
            //getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                   // WindowManager.LayoutParams.FLAG_FULLSCREEN);
            gameUI = new GameUI(this);
    
            setContentView(gameUI);//底部支持一个view对象
        }
    
        /** * * @param event 响应触摸事件 发射炸弹 * @return */
        @Override
        public boolean onTouchEvent(MotionEvent event) {
            gameUI.handleTouch(event);
            return true;
        }
    }

AndroidMainfest.xml

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.luokexi.gameuidayone">
    
        <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@android:style/Theme.Light.NoTitleBar.Fullscreen">
            <activity android:name=".MainActivity">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
        </application>
    
    </manifest>

GameUI

package com.example.luokexi.gameuidayone;
    
    import android.content.Context;
    import android.graphics.BitmapFactory;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.graphics.Point;
    import android.util.Log;
    import android.view.MotionEvent;
    import android.view.SurfaceHolder;
    import android.view.SurfaceView;
    
    import com.example.luokexi.gameuidayone.domain.Bomb;
    import com.example.luokexi.gameuidayone.domain.Boy;
    import com.example.luokexi.gameuidayone.domain.MyButton;
    
    import java.util.ArrayList;
    import java.util.concurrent.CopyOnWriteArrayList;
    
    import static android.R.attr.button;
    
    /** * Created by Luokexi on 2017/7/1. */
    
    public class GameUI extends SurfaceView implements SurfaceHolder.Callback{ 
        private boolean isRender ; // 标记是否开启线程
        private MyButton mButton;
        //private Bomb bomb;
        private Boy boy;
    // private ArrayList<Bomb> bombList = new ArrayList<Bomb>();
        private CopyOnWriteArrayList<Bomb> bombList = new CopyOnWriteArrayList<Bomb>();
        public GameUI(Context context) {
            super(context);
    
            SurfaceHolder holder  = getHolder();//获取放映机
            holder.addCallback(this);//添加会调
        }
    
        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            isRender = true;
            boy = new Boy(BitmapFactory.decodeResource(getResources(),
                    R.drawable.boy),new Point(0,0));
    // bomb = new Bomb(BitmapFactory.decodeResource(getResources(),
    // R.drawable.ic_bomb),new Point(0,0),new Point(200,200));
    
            mButton = new MyButton(BitmapFactory.decodeResource(getResources(),
                    R.drawable.bottom),BitmapFactory.decodeResource(getResources(),
                    R.drawable.bottom_pass),new Point(30,getHeight()-400));
            mButton.setClickListener(new MyButton.ClickListener() {
                @Override
                public void click() {
                    Log.d("TAG","被点击");
                    //boy.move(Boy.MOVE_DOWN);
                    int y =  getHeight() -  boy.mDefaultBitmap.getHeight();
                    if(boy.mPoint.y < y){
                        boy.move(Boy.MOVE_DOWN);
                    }
                }
            });
            RenderThread renderThread = new RenderThread();
            renderThread.start();//开启绘制线程
        }
    
        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    
        }
    
        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            isRender = false;
        }
    
        /** * * @param event 响应触摸事件 发射炸弹 * @return */
        public void handleTouch(MotionEvent event) {
    
    
            int x = (int) event.getX();
            int y = (int) event.getY();
            Point point = new Point(x,y);
            switch (event.getAction()){
                case MotionEvent.ACTION_DOWN:
                    if (!mButton.isClick(point)) {
                        Bomb bomb = boy.createBomb(getContext(), point);
                        bombList.add(bomb);
                    }else {
                        System.out.println("按钮被点击");
                    }
                    break;
                case MotionEvent.ACTION_UP:
                        mButton.setClick(false);//抬起时需要将图片设为默认
                default:
                    break;
            }
        }
        /** * 开启子线程 绘制界面 */
        class RenderThread extends Thread{
            @Override
            public void run() {
                // while不断循环 保证界面不断发生变化 从而实现动画效果
                while (isRender){
                        drawUI();
                }
            }
        }
    
        private void drawUI(){
                //绘制界面
            Canvas canvas = getHolder().lockCanvas();//获取画布对象
            if(canvas != null){
            Paint paint = new Paint();
            paint.setColor(Color.WHITE);
            canvas.drawRect(0,0,getWidth(),getHeight(),paint); //画矩形
    
                boy.drawSelf(canvas);//绘制男孩对象
                mButton.drawSelf(canvas);//绘制按钮
    // if (bomb != null) { 
    // bomb.drawSelf(canvas);//绘制炸弹对象
    // bomb.move();//炸弹移动
    // }
                //遍历炸弹集合画出所有炸弹
    // for (int i = 0;i<bombList.size();i++){ 
    // Bomb bomb = bombList.get(i);
    // bomb.drawSelf(canvas);//绘制炸弹对象
    // bomb.move();//炸弹移动
    // //判断炸弹是否移除屏幕
    // Point point = bomb.getPoint();
    // if(point.x>getWidth()||point.x<0
    // ||point.y>getHeight()||point.y<0){ 
    // bombList.remove(i);
    // } 这里用for循环会出现并发修改异常
    // ArrayList<Bomb> list = new ArrayList<Bomb>();
    // list.addAll(bombList);
                for (Bomb bomb : bombList) {
                    bomb.drawSelf(canvas);
                    bomb.move();
                    //判断炸弹是否移除屏幕
                    Point point = bomb.getPoint();
                    if (point.x > getWidth() || point.x < 0
                            || point.y > getHeight() || point.y < 0) {
                        bombList.remove(bomb);
                    }
                }
            getHolder().unlockCanvasAndPost(canvas);//提交画布
            }
        }
    
    }

接下来是三个Sprite基类

Bomb

package com.example.luokexi.gameuidayone.domain;
    
    import android.graphics.Bitmap;
    import android.graphics.Point;
    
    /** * Created by Luokexi on 2017/7/1. */
    
    public class Bomb extends Sprite { 
        private int speed =200;//移动速度
        private int dx;//移动时x的偏移量
        private int dy;//移动时y的偏移量
        public Bomb(Bitmap mDefaultBitmap, Point point,Point targetPoint) {
            super(mDefaultBitmap, point); // 当前坐标点 point(从父类里得到的坐标点) 目标坐标点 targetPoint
            int x = targetPoint.x - point.x;
            int y = targetPoint.y - point.y;
            int d = (int) Math.sqrt(x*x + y*y);//获取炸弹移动距离
            dx = x * speed /d;
            dy = y * speed /d;
        }
    
        /** * move 炸弹移动 */
        public void move(){
    
              mPoint.x += dx;
              mPoint.y += dy;
        }
    
        /** * 获取炸弹坐标点 * @return */
        public Point getPoint(){
            return  mPoint;
        }
    }

Boy

package com.example.luokexi.gameuidayone.domain;
    
    import android.content.Context;
    import android.content.res.Resources;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.graphics.Point;
    
    import com.example.luokexi.gameuidayone.R;
    
    /** * Created by Luokexi on 2017/7/1. */
    
    public class Boy extends Sprite { 
        public static final int MOVE_DOWN= 0;
        public static final int MOVE_UP = 1;
        public static final int MOVE_LEFT = 2;
        public static final int MOVE_RIGHT = 3;
        private Bomb bomb;
        private int speed = 5;//男孩移动的速度
        public Boy(Bitmap mDefaultBitmap, Point mPoint) {
            super(mDefaultBitmap, mPoint);
        }
    
        /** * 产生炸弹 * @return * 目标点 targetPoint */
        public Bomb createBomb(Context cxt,Point targetPoint){
            bomb = new Bomb(BitmapFactory.decodeResource(cxt.getResources(),
                    R.drawable.ic_bomb1),new Point(mPoint.x+100,mPoint.y+225),targetPoint);
            return bomb;
        }
    
        /** * 男孩移动 * @param direction */
        public void move(int direction){
    
            switch (direction){
                case MOVE_DOWN:
                    mPoint.y += speed;
                    break;
                default:
                    break;
            }
        }
    
    
    }

MyButton

package com.example.luokexi.gameuidayone.domain;
    
    import android.graphics.Bitmap;
    import android.graphics.Canvas;
    import android.graphics.Point;
    import android.graphics.Rect;
    
    import java.util.Timer;
    import java.util.TimerTask;
    
    /** * Created by Luokexi on 2017/7/1. */
    
    public class MyButton extends Sprite { 
        private boolean isClick;//标记按钮是否被点击
        private Bitmap mPressBitMap;//被点击后的图片
        private Timer timer;//定时器一点一点走
        public MyButton(Bitmap mDefaultBitmap, Bitmap mPressBitMap,Point mPoint) {
            super(mDefaultBitmap, mPoint);
            this.mPressBitMap = mPressBitMap;
        }
    
        /** * 判断按钮是否被点击 * @param point * @return */
        public boolean isClick(Point point){
            //获取按钮所在的矩形区域
            Rect rect = new Rect(mPoint.x,mPoint.y,mPoint.x
                    + mDefaultBitmap.getWidth(), mPoint.y
                    + mDefaultBitmap.getHeight());
    
             isClick = rect.contains(point.x,point.y);
    
                    if (isClick){
                        if (clickListener != null){
                            //启动一个定时器,当按住按钮不放时小人可以一直持续移动
                            timer = new Timer();
                            timer.schedule(new TimerTask() {
                                @Override
                                public void run() {
                                    clickListener.click();
                                }
                            },0,200);
                        }
                    }
            return isClick;
        }
        private ClickListener clickListener;
        //设置按钮点击监听
        public void setClickListener(ClickListener clickListener){
            this.clickListener = clickListener;
        }
        /** * 按钮点击的回调接口 */
        public interface ClickListener{ 
                public void click();
        }
        public void setClick(boolean isClick){
            this.isClick = isClick;
            if (!isClick){
                if (timer != null){
                    timer.cancel();//停止定时器
                }
            }
        }
        @Override
        public void drawSelf(Canvas canvas) {
            if(!isClick){
                super.drawSelf(canvas);
            }else {
                //mPressBitMap 按钮被点击后的图片
                canvas.drawBitmap(mPressBitMap,mPoint.x,mPoint.y,null);//绘制图片
            }
    
        }
    }

Sprite

package com.example.luokexi.gameuidayone.domain;
    
    
    import android.graphics.Bitmap;
    import android.graphics.Canvas;
    import android.graphics.Point;
    
    /** * 精灵基类 * */
    public class Sprite { 
    
        public Bitmap mDefaultBitmap;
        public Point mPoint;
    
        public Sprite(Bitmap mDefaultBitmap, Point mPoint) {
            this.mDefaultBitmap = mDefaultBitmap;
            this.mPoint = mPoint;
        }
        public void drawSelf(Canvas canvas){
            if (mDefaultBitmap != null) {
                canvas.drawBitmap(mDefaultBitmap, mPoint.x, mPoint.y, null);//绘制图片
            }
        }
    }

res/drawable文件夹下的图片  
boy.png  
![这里写图片描述][SouthEast 2]

ic\_bomb1.png

![这里写图片描述][SouthEast 3]

botttom.png

![这里写图片描述][SouthEast 4]

botttom\_pass.png

![这里写图片描述][SouthEast 5]

案例实现

![这里写图片描述][SouthEast 6]

以上案例讲解请见 [http://pan.baidu.com/s/1qYRqzpE][http_pan.baidu.com_s_1qYRqzpE]

[SouthEast]: /images/20220612/a219c8f4ad3648789e90c8d257c075b3.png
[SouthEast 1]: /images/20220612/8cd9ca805f9a41999cf8d644b9d1644d.png
[SouthEast 2]: /images/20220612/11b4e934361e428baf1717cc61d284b5.png
[SouthEast 3]: /images/20220612/8610e188564a46d183ffc2824ff2723a.png
[SouthEast 4]: /images/20220612/8c615f0b90fe43718d24c17159c006a0.png
[SouthEast 5]: /images/20220612/587c8c84eef84f5ca11dd4f8e4bab6b9.png
[SouthEast 6]: /images/20220612/7159a312bdd343c89bf34fa8fac260bd.png
[http_pan.baidu.com_s_1qYRqzpE]: http://pan.baidu.com/s/1qYRqzpE