问题描述

所做Android打砖块代码其中 出错 求教

下面是代码 可其中出现了一个错误（做了标记），不知道怎么解决，可否有高手帮我看看，能不能稍作修改一下，做成正确的。
就是这句错了 myview = new BallView(this);

package sen.tan;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.util.DisplayMetrics;import android.view.KeyEvent;import android.view.MotionEvent;import android.view.View;import android.view.Window;import android.view.WindowManager;import android.widget.Button;import android.widget.ImageView;import android.widget.TextView;public class dazhuankuaiActivity extends Activity {    BallView myview;    public static  int screenWidth ;    public static  int screenHeight;    private TextView textview;    Button kaishijieshuguanyu;    ImageView image;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        String string = ""欢迎进入疯狂打砖块游戏"";        image = (ImageView) this.findViewById(R.id.image);        image.setImageResource(R.drawable.img1);        textview =(TextView) this.findViewById(R.id.textview);        textview.setTextSize(20);        textview.setTextColor(Color.GREEN);        textview.setBackgroundColor(Color.RED);        textview.setText(string);        kaishi=(Button)findViewById(R.id.button1);        guanyu=(Button)findViewById(R.id.button2);        jieshu=(Button)findViewById(R.id.button3);        kaishi.setWidth(250);        guanyu.setWidth(200);        jieshu.setWidth(150);        kaishi.setTextSize(35);        guanyu.setTextSize(29);        jieshu.setTextSize(24);        jieshu.setOnClickListener(new Button.OnClickListener(){            public void onClick(View v)            {                dazhuankuaiActivity.this.finish();            }        });        guanyu.setOnClickListener(new Button.OnClickListener(){            public void onClick(View v){                textview.setText(""本游戏由xxx制作，此游戏控制左右按键，来回移动挡板，不让小球掉落，当小球把上方砖块全部打完时，游戏胜利"");            }        });        kaishi.setOnClickListener(new Button.OnClickListener(){            public void onClick(View v){                DisplayMetrics dm = new DisplayMetrics();                getWindowManager().getDefaultDisplay().getMetrics(dm);                screenWidth = dm.widthPixels;                screenHeight = dm.heightPixels;                             setTitle(""宽""+screenWidth+""  高""+screenHeight);                requestWindowFeature(Window.FEATURE_NO_TITLE);                 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREENWindowManager.LayoutParams.FLAG_FULLSCREEN);                     `myview = new BallView(this);`    //错误在这里                 setContentView(myview);            }            public boolean onKeyDown(int keyCode KeyEvent event)            {            switch (keyCode)                {        case KeyEvent.KEYCODE_MENU:            myview.resetGame();            break;            case KeyEvent.KEYCODE_DPAD_CENTER:            myview.ball_isRun = !myview.ball_isRun;               break;            case KeyEvent.KEYCODE_DPAD_LEFT:                    if(myview.ball_isRun){                if(myview.board_left<=myview.board_x_move)                    {            myview.board_left=0;                myview.board_right=myview.board_length;                }else{                myview.board_left-=myview.board_x_move;                        myview.board_right-=myview.board_x_move;}        }                         break;            case KeyEvent.KEYCODE_DPAD_RIGHT:        if(myview.ball_isRun){                if(screenWidth-myview.board_right<=myview.board_x_move )        {                            myview.board_left=screenWidth-myview.board_length;                                            myview.board_right=screenWidth;            }else{                            myview.board_left+=myview.board_x_move;                                                myview.board_right+=myview.board_x_move;                    }                    }                    break;                 case KeyEvent.KEYCODE_DPAD_UP:                if(myview.ball_isRun){                if( myview.board_alterable_top==myview.board_default_top)        {                myview.board_alterable_top-=myview.boardYadd;                        myview.board_alterable_bottom-=myview.boardYadd;                        }                    }                    break;                   case KeyEvent.KEYCODE_DPAD_DOWN:            if(myview.ball_isRun){            if( myview.board_alterable_top==myview.board_default_top-myview.boardYadd )            {                            myview.board_alterable_top=myview.board_default_top;            myview.board_alterable_bottom=myview.board_alterable_top+myview.board_thickness;                        }                    }            break;              case KeyEvent.KEYCODE_BACK:            dazhuankuaiActivity.this.finish();            break;          }//end switch            return false;            }            //按键弹起事件        }        );        }}package sen.tan;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RadialGradient;import android.graphics.Shader;import android.util.Log;import android.view.SurfaceHolder;import android.view.SurfaceView;public class BallView extends SurfaceView implements        SurfaceHolder.Callback Runnable {    //线程延时控制     final int ball_sleep=1;//毫秒，延时越大，球速越慢    final int ball_r= 8;//小球半径    final float ball2_r= 8;//底下滚珠小球半径    final int ballXorYadd = 4;//小球的基本位移。测试可行值：2，4    //获取屏幕宽度和高度    int screen_width;//320;    int screen_height;//480;    //砖的属性    int brick_width;//每块砖宽    int brick_height;//每块砖高    boolean brick_exist[];//砖是否存在    int k ;// 列//到for循环里才初始化    int j ;// 行    int brick_left = brick_width*(k-1);//到判断语句才初始化    int brick_right = brick_width*k;    int brick_top = brick_height*j;    int brick_bottom = brick_height*(j+1);    //挡板的属性    int board_length;//挡板长度:80比较合适，可以随意修改但别超过screen_width    final int boardYadd = 16;//按上下键时挡板y方向位移量。经验证4、8、16可以，12不行    final int board_x_move = 30;//挡板x方向位移量:可以随意自定义    int board_left;//挡板左侧（可变）    int board_right;//挡板右侧（可变）    int board_thickness;//挡板厚度    int board_default_top;//即435挡板的top面初始位置    int board_alterable_top;//挡板上侧（可变）    int board_alterable_bottom;//挡板下侧（可变）    int ball_default_x;//球的初始x坐标    int ball_default_y;//球的初始y坐标    //球的即时坐标（可变）：    int ball_x;//球心横坐标    int ball_y;//球心纵坐标    //球的前一步的y坐标    int ball_previous_y;    int ball_x_speed;//球的横向偏移量//可变    int ball_y_speed;//球的纵向偏移量//可变    boolean ball_isRun;//球是否在动    // 控制循环    boolean mbLoop;    // 定义SurfaceHolder对象    SurfaceHolder mSurfaceHolder = null;    //获得分数    int score;    /* 唤醒渐变渲染 */    Shader mRadialGradient = null;//------------------------------------------------------------------------------------------------------//    public BallView(Context context) {        super(context);        // 实例化SurfaceHolder        mSurfaceHolder = this.getHolder();        // 添加回调        mSurfaceHolder.addCallback(this);        this.setFocusable(true);        //获取屏幕宽度和高度        screen_width = dazhuankuaiActivity.screenWidth;//320        screen_height = dazhuankuaiActivity.screenHeight;//480        //砖的属性        brick_width = screen_width/5;//每块砖宽64        brick_height = screen_height/15;//每块砖高32        //挡板的属性        board_length = screen_width/4;//挡板长度:80比较合适，可以随意修改但别超过screen_width        board_left = (screen_width-board_length)/2;//挡板左侧（可变）        board_right = (screen_width+board_length)/2;//挡板右侧（可变）        board_thickness = 5;//挡板厚度        board_default_top = 13*screen_height/15;//即435挡板的top面初始位置        board_alterable_top = board_default_top;//挡板上侧（可变）        board_alterable_bottom = board_alterable_top+board_thickness;//挡板下侧（可变）        ball_default_x = screen_width/2;//球的初始x坐标        ball_default_y = board_default_top - ball_r;//球的初始y坐标        //球的即时坐标（可变）：        ball_x = ball_default_x;        ball_y = ball_default_y;        //球的前一步的y坐标        ball_previous_y = 0;        ball_x_speed = ballXorYadd;//球的横向偏移量        ball_y_speed = ballXorYadd;//球的纵向偏移量        mbLoop = true;        ball_isRun = false;        score=0;        brick_exist = new boolean[25];        for (int i = 0; i < 25; i++) {            brick_exist[i] = true;        }        /* 构建RadialGradient对象，设置半径的属性 */        mRadialGradient = new RadialGradient(ball_x ball_y ball_r//球中心坐标xy半径r                new int[]{Color.WHITEColor.BLUEColor.GREENColor.REDColor.YELLOW}//颜色数组                null//颜色数组中每一种颜色对应的相对位置，为空的话就是平均分布，由中心向外排布                Shader.TileMode.REPEAT);//渲染模式：重复    }    public void resetGame(){        ball_isRun = false;        score =0;//分数        ball_x_speed = ballXorYadd;//球的横向偏移量        ball_y_speed = ballXorYadd;//球的纵向偏移量        ball_x = screen_width/2;//球心起始横坐标        ball_y = board_default_top - ball_r;//球心起始纵坐标        board_left = (screen_width-board_length)/2;//挡板左侧        board_right = (screen_width+board_length)/2;//挡板右侧        board_alterable_top = board_default_top;//挡板上侧        board_alterable_bottom = board_alterable_top+board_thickness;//挡板下侧        for (int i = 0; i < 25; i++) {            brick_exist[i] = true;        }    }    //---------------------------------绘图循环开始----------------------------------    public void run() {        while (mbLoop&&!Thread.currentThread().isInterrupted()) {            try {                Thread.sleep(ball_sleep);            }            catch (InterruptedException e) {                Thread.currentThread().interrupt();            }            //球的前一步y坐标            ball_previous_y = ball_y;            if (ball_isRun) {                ballRunning();// 让小球移动                boardPositionCheck();//检测挡板是否处于“中线”位置，是就随小球上升一步，直至到“上线”                hitWallCheck();//墙壁碰撞检测                hitBoardCheck();//挡板碰撞检测                hitBrickCheck();//砖块碰撞检测            }            synchronized (mSurfaceHolder)             {                Draw();            }        }    }    //---------------------------------绘图循环结束----------------------------------    //------------------------------------------------------------------------------    //让小球移动    public void ballRunning() {        ball_x += ball_x_speed;        ball_y -= ball_y_speed;    }    //朝左或朝右碰撞后小球水平方向逆向    public void ballLeftOrRightHit() {        ball_x_speed *= -1;    }    //朝上或朝下碰撞后小球竖直方向逆向    public void ballUpOrDownHit() {        ball_y_speed *= -1;    }    public void ballcornerHit() {        ball_x_speed *= -1;        ball_y_speed *= -1;    }    public void ballStraightUp() {//功能没实现，这是多余代码        ball_x_speed = 0;//注意在其他地方恢复        ball_y_speed *= -1;    }    //-------------------墙壁碰撞检测开始-------------------------------------    public void hitWallCheck() {        // 左碰墙        if (ball_x <= ball_r &&             ball_y >= ball_r && ball_y <= screen_height)         {            ballLeftOrRightHit();        // 右碰墙        }        if (ball_x >= screen_width - ball_r && //不能写为 else if因为可能恰好碰到角落。                   ball_y >= ball_r && ball_y <= screen_height)         {            ballLeftOrRightHit();        }        // 上碰墙        if (ball_x >= ball_r && ball_x <= screen_width - ball_r &&                  ball_y <= ball_r + brick_height) //、、、、、、、、、、、、、、、25号修改        {            ballUpOrDownHit();        }        // 下碰墙        if (ball_x >= ball_r && ball_x <= screen_width - ball_r &&                  ball_y >= screen_height-ball_r)         {            ballUpOrDownHit();            if(score<=10){                score = 0;            }            else score-=10;        }    }    //-------------------墙壁碰撞检测结束-------------------------------------    //-----------------------------挡板碰撞检测开始---------------------------    public void hitBoardCheck() {        // 下碰挡板正面        if (ball_x >= ball_r && ball_x <= screen_width - ball_r && //在屏幕内，起码条件            ball_x >= board_left && ball_x <= board_right && //在挡板X域上方            ball_y == board_alterable_top - ball_r &&//球面与挡板相切            ball_previous_y <= board_alterable_top - ball_r  //确定球是从上方下落            )        {            if(board_alterable_top==board_default_top-boardYadd ){//如果弹簧伸张，挡板位于上线                ballHitBoardlower();//作用：ball_y_move减小；挡板被打下;小球Y向运动反向            }            else if(board_alterable_top==board_default_top){//如果弹簧压缩，挡板位于下线                boardHitBallHigher();//作用：ball_y_move增加；挡板弹上;小球Y向运动反向            }        }        //斜碰挡板右上角//经验证有效        else if(Math.pow(board_right-ball_x 2)+Math.pow(board_alterable_top-ball_y2)<=Math.pow(ball_r 2)&&                ball_x>board_right && ball_y<board_alterable_top)        {            ballcornerHit();        }        //斜碰挡板的左上角//经验证有效        else if(Math.pow(board_left-ball_x 2)+Math.pow(board_alterable_top-ball_y2)<=Math.pow(ball_r 2)&&                ball_x<board_left && ball_y<board_alterable_top)        {            ballcornerHit();        }    }    //-----------------------------挡板碰撞检测结束--------------------------    private void boardHitBallHigher() {//增强        ballUpOrDownHit();//小球Y方向反向ball_y_speed变为正数        if(ball_y_speed == ballXorYadd ){            ball_y_speed += ballXorYadd;//离开挡板后小球Y方向速度增强        }        if( boardYadd > ball_y_speed ){//在线程这一轮，小球上升多少，挡板就上升多少。            board_alterable_top = board_default_top - ball_y_speed;            board_alterable_bottom= board_alterable_top+board_thickness;//挡板下层面        }    }    //检测挡板是否处于“中线”位置，是就随小球上升一步，直至到“上线”    private void boardPositionCheck() {//还可直接利用球的位置刷新，board_top与球心相差ball_r        if(board_alterable_top < board_default_top && board_alterable_top > board_default_top-boardYadd){            //挡板随球上升            if(board_alterable_top - ball_y_speed >= board_default_top-boardYadd){                board_alterable_top -= ball_y_speed;//挡板上层面                board_alterable_bottom= board_alterable_top+board_thickness;//挡板下层面            }            else{                board_alterable_top = board_default_top-boardYadd;//挡板上层面                board_alterable_bottom= board_alterable_top+board_thickness;//挡板下层面            }        }    }    private void ballHitBoardlower() {//减弱        board_alterable_top=board_default_top;        board_alterable_bottom=board_default_top+board_thickness;//挡板被打退        ballUpOrDownHit();//小球Y方向反向        if(ball_y_speed==2*ballXorYadd){            ball_y_speed -= ballXorYadd;//小球Y方向速度减弱        }    }    //砖块碰撞检测开始-----------------------------------------------------------    public void hitBrickCheck() {        for (int i = 0; i <25 ; i++) {        if (brick_exist[i]) {            k = i % 5+1;// 12345循环            j = i / 5+1;// 11111;22222;...;55555            brick_left = brick_width*(k-1);            brick_right = brick_width*k;            brick_top = brick_height*j;            brick_bottom = brick_height*(j+1);            //朝下碰砖的top面 AAAAAAAAAAAAAAAAAAAAA            if(ball_x >= brick_left && ball_x <= brick_right &&               ball_y >= brick_top-ball_r && ball_y < brick_top)             {                ballUpOrDownHit();                brick_exist[i] = false;                score+=4;                //朝下正碰2砖中间，i砖右上角检测                if(k!=5 && ball_x == brick_right)//如果不是第5列砖的右侧边                {                    //如果砖[i+1]存在                    if(brick_exist[i+1]){                        brick_exist[i+1] = false;                        score+=4;                    }                }                //朝下正碰2砖中间，i砖左上角检测                else if(k!=1 && ball_x == brick_left)//如果不是第1列砖的左侧边                {                    //如果砖[i-1]存在                    if(brick_exist[i-1]){                        brick_exist[i-1] = false;                        score+=4;                    }                }            }            //朝上碰砖的bottom面 BBBBBBBBBBBBBBBBB            else if(ball_x >= brick_left && ball_x <= brick_right &&                    ball_y > brick_bottom&& ball_y <= brick_bottom + ball_r )            {                ballUpOrDownHit();                brick_exist[i] = false;                score+=4;                //朝上正碰2块砖中间--i砖的右下角检测                if(k!=5 && ball_x == brick_right) //如果不是第5列砖的右侧边                {                    if(brick_exist[i+1]){//如果砖[i+1]存在                        brick_exist[i+1] = false;                        score+=4;                    }                }                //朝上正碰2块砖中间--i砖的左下角检测                else if(k!=1 && ball_x == brick_left) //如果不是第1列砖的左侧边                {                    if(brick_exist[i-1]){//如果砖[i-1]存在                        brick_exist[i-1] = false;                        score+=4;                    }                }            }            //朝右碰砖的left面CCCCCCCCCCCCCCCCC            else if(ball_x >= brick_left -ball_r&&ball_x < brick_left&&               ball_y >= brick_top && ball_y <= brick_bottom)            {                ballLeftOrRightHit();                brick_exist[i] = false;                score+=4;                //朝右正碰2块砖中间，左下角检测                if(j!=5 && ball_y == brick_bottom)//如果不是第5行砖的下侧边                {                    if(brick_exist[i+5]){//如果砖[i+5]存在                        brick_exist[i+5] = false;                        score+=4;                    }                }                //朝右正碰2块砖中间，左上角检测                else if(j!=1 && ball_y == brick_top)//如果不是第1行砖的上侧边                {                    if(brick_exist[i-5]){//如果砖[i-5]存在                        brick_exist[i-5] = false;                        score+=4;                    }                }            }            //朝左碰砖的right面DDDDDDDDDDDDDDDDDD            else if(ball_x >= brick_right && ball_x <= brick_right+ball_r&&               ball_y >= brick_top && ball_y <= brick_bottom)            {                ballLeftOrRightHit();                brick_exist[i] = false;                score+=4;                //朝左正碰2块砖中间，右下角检测                if(j!=5 && ball_y == brick_bottom )//如果不是第5行砖的下侧边                {                    if(brick_exist[i+5]){//如果砖[i+5]存在                        brick_exist[i+5] = false;                        score+=4;                    }                }                 //朝左正碰2块砖中间，右上角检测                else if(j!=1 && ball_y == brick_top )//如果不是第1行砖上侧边                {                    if(brick_exist[i-5]){//如果砖[i-5]存在                        brick_exist[i-5] = false;                        score+=4;                    }                }            }            /////////////////////////////////////////            //斜碰i砖的左下角EEEEEEEEEEEEEEEEEEEEEEEE            else if(( i-1<0||(i-1>=0&&!brick_exist[i-1]) ) &&                    (i+5>=25||(i+5<25&&!brick_exist[i+5]) )&&                    Math.pow(brick_left-ball_x 2)+Math.pow(brick_bottom-ball_y2)<=Math.pow(ball_r 2)&&                    ball_x>brick_left-ball_r && ball_x<brick_left &&                     ball_y>brick_bottom && ball_y<brick_bottom+ball_r )            {                ballcornerHit();                brick_exist[i] = false;                score+=4;            }            //斜碰i砖的右下角FFFFFFFFFFFFFFFFFFFFFFFFFF            else if( (i+1>=25||(i+1<25&&!brick_exist[i+1]) )&&                     (i+5>=25||(i+5<25&&!brick_exist[i+5]) )&&                    Math.pow(brick_right-ball_x 2)+Math.pow(brick_bottom-ball_y2)<=Math.pow(ball_r 2)&&                    ball_x>brick_right&&ball_x<brick_right+ball_r&&                    ball_y>brick_bottom&&ball_y<brick_bottom+ball_r )            {                Log.v(""----------""right bottom hit""+i+"":""+brick_exist[i]);                ballcornerHit();                 brick_exist[i] = false;                score+=4;            }            //斜碰i砖的右上角GGGGGGGGGGGGGGGGGGGGGGGG            else if( (i+1>=25||(i+1<25&&!brick_exist[i+1]) )&&                    (i-5<0||(i-5>0&&!brick_exist[i-5]) )&&                    Math.pow(brick_right-ball_x 2)+Math.pow(brick_top-ball_y2)<=Math.pow(ball_r 2)&&                    ball_x>brick_right && ball_x<brick_right+ball_r&&                    ball_y>brick_top-ball_r && ball_y<brick_top)                      {                ballcornerHit();                brick_exist[i] = false;                score+=4;            }            //斜碰i砖的左上角HHHHHHHHHHHHHHHHHHHHHHHHHH            else if((i-1<0||(i-1>=0&&!brick_exist[i-1])) &&                    (i-5<0||(i-5>=0&&!brick_exist[i-5])) &&                    Math.pow(brick_left-ball_x 2)+Math.pow(brick_top-ball_y2)<=Math.pow(ball_r 2)&&                    ball_x>brick_left-ball_x && ball_x<brick_left &&                    ball_y>brick_top-ball_r && ball_y<brick_top )            {                ballcornerHit();                brick_exist[i] = false;                score+=4;            }        }//end if        }//end for      }//end hitBrickCheck()    //砖块碰撞检测结束-----------------------------------------------------------    //------------------------------------------    public boolean gameOver(){        int count = 0;        for(boolean s:brick_exist){            if(!s){                count++;            }        }        if(count == 25){            return true;        }else{            return false;        }    }    //------------------------------------------    //---------------绘图方法开始------------------------    public void Draw() {        // 锁定画布，得到canvas        Canvas canvas = mSurfaceHolder.lockCanvas();        if (mSurfaceHolder == null || canvas == null) {            return;        }        // 绘图        Paint mPaint = new Paint();        // 设置取消锯齿效果        mPaint.setAntiAlias(true);        mPaint.setColor(Color.BLACK);        // 绘制矩形--背景        canvas.drawRect(0 0 screen_width brick_height-2 mPaint);        mPaint.setColor(Color.GREEN);        // 绘制矩形--背景        canvas.drawRect(0 brick_height-2 screen_width screen_height mPaint);        mPaint.setColor(Color.RED);//设置字体颜色        mPaint.setTextSize(brick_height-7);//设置字体大小        canvas.drawText(""得分：""+score 0 brick_height-7 mPaint);        // 绘制顶层挡板````````````````````````````````````````````````````````25号修改        mPaint.setColor(Color.BLACK);//设置颜色         mPaint.setStrokeWidth(4);//设置粗细        canvas.drawLine(0 brick_height-2 screen_width brick_height-2 mPaint);        for (int i = 0; i <25 ; i++) {            if (brick_exist[i]) {                k = i % 5+1;// 12345循环                j = i / 5+1;// 11111;22222;...;55555                brick_left = brick_width*(k-1);                brick_right = brick_width*k;                brick_top = brick_height*j;                brick_bottom = brick_height*(j+1);                mPaint.setStyle(Paint.Style.FILL);// 设置实心画笔                mPaint.setColor(Color.YELLOW);                canvas.drawRect(brick_left+1 brick_top+1 brick_right-1brick_bottom-1 mPaint);                mPaint.setStyle(Paint.Style.STROKE);// 设置空心画笔                mPaint.setStrokeWidth(2);//设置粗细                mPaint.setColor(Color.BLUE);                canvas.drawRect(brick_left+3 brick_top+3 brick_right-3brick_bottom-3 mPaint);            }        }        // 设置实心画笔        mPaint.setStyle(Paint.Style.FILL);        {            mPaint.setShader(mRadialGradient);            canvas.drawCircle(ball_x ball_y ball_r mPaint);        }           Paint mPaint2 = new Paint();            // 设置取消锯齿效果        mPaint2.setAntiAlias(true);         // 设置实心画笔        mPaint2.setStyle(Paint.Style.FILL);        {           mPaint2.setColor(Color.BLACK);        /* 绘制矩形挡板 */        canvas.drawRect(board_left board_alterable_top board_right board_alterable_bottommPaint2);        float board2_bottom = screen_height - 2*ball2_r;//164        float board2_top = board2_bottom - 4;//160        //线段端点坐标数组        float x0 = board_left+(board_right-board_left)/4;        float y0 = board_alterable_bottom;//440或者444        float springAdd = (board2_top- board_alterable_bottom)/8;//即2.5或者2：弹簧小线段的y向长度        float springWidth = 5.0f;//弹簧小线段的x向长度        float x1 = x0 - springWidth;        float y1 = y0 + springAdd;        float x2 = x0 + springWidth;        float y2 = y0 + 3*springAdd;        float x3 = x1 ;        float y3 = y0 + 5*springAdd;        float x4 = x2;        float y4 = y0 + 7*springAdd;        float x5 = x0 ;        float y5 = board2_top;//即460         float between_spring = (board_right-board_left)/2;        float pts[] = { x0y0x1y1                        x1y1x2y2                        x2y2x3y3                        x3y3x4y4                        x4y4x5y5};        float pts2[] = {x0+between_springy0 x1+between_springy1                        x1+between_springy1 x2+between_springy2                        x2+between_springy2 x3+between_springy3                        x3+between_springy3 x4+between_springy4                        x4+between_springy4 x5+between_springy5};        mPaint2.setStrokeWidth(2);//设置弹簧粗细        //绘制2个弹簧        canvas.drawLines(pts mPaint2);        canvas.drawLines(pts2 mPaint2);        //绘制下层挡板        canvas.drawRect(board_left board2_top board_right board2_bottommPaint2);        mPaint2.setColor(Color.BLACK);//        // 绘制最下面的两个“轮子”(圆心x圆心y半径rp)         canvas.drawCircle(board_left+ball2_r screen_height-ball2_r ball2_r mPaint2);//圆        canvas.drawCircle(board_right-ball2_r screen_height-ball2_r ball2_r mPaint2);        mPaint2.setColor(Color.WHITE);//        canvas.drawPoint(board_left+ball2_r screen_height-ball2_r mPaint2);//绘制左轮轮心        canvas.drawPoint(board_right-ball2_r screen_height-ball2_r mPaint2);//绘制右轮轮心        }//实心画笔mPaint2结束        if(gameOver()){ //          mbLoop = false;//注释掉的话GAME OVER后也可重启            ball_isRun = false;            mPaint2.setColor(Color.BLACK);//设置字体颜色            mPaint2.setTextSize(40.0f);//设置字体大小            canvas.drawText(""GAME OVER"" screen_width/32+40 screen_height/16*9-70 mPaint2);            mPaint2.setTextSize(20.0f);//设置字体大小            canvas.drawText(""Press ""MENU"" button to restart                             screen_width/32 //320/32=10                            screen_height/16*9 //480/16=3030*9=270                            mPaint2);            canvas.drawText(""Press ""BACK"" button to exit.""                     screen_width/32 //320/32=10                    screen_height/16*10 //480/16=3030*10=300                    mPaint2);        }        // 绘制后解锁，绘制后必须解锁才能显示        mSurfaceHolder.unlockCanvasAndPost(canvas);    }// end of Draw()    //---------------------绘图方法结束-----------------------------------------------    // 在surface的大小发生改变时激发    public void surfaceChanged(SurfaceHolder holder int format int width            int height) {    }    // 在surface创建时激发    public void surfaceCreated(SurfaceHolder holder) {        new Thread(this).start();// 开启绘图线程    }    // 在surface销毁时激发    public void surfaceDestroyed(SurfaceHolder holder) {        // 停止循环        mbLoop = false;    }}下个界面的代码是  package ab.cc;import android.app.Activity;import android.os.Bundle;import android.util.DisplayMetrics;import android.view.KeyEvent;import android.view.MotionEvent;import android.view.Window;import android.view.WindowManager;public class BaomingActivity extends Activity{BallView myView;static int  screenWidth;static int screenHeight;/** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState)    {    super.onCreate(savedInstanceState);    /* 定义DisplayMetrics对象 */DisplayMetrics dm = new DisplayMetrics();    /* 取得窗口属性 */getWindowManager().getDefaultDisplay().getMetrics(dm);    /* 窗口的宽度 */screenWidth = dm.widthPixels;        /* 窗口的高度 */screenHeight = dm.heightPixels;//      setTitle(""宽""+screenWidth+""  高""+screenHeight);        /* 设置为无标题栏 */requestWindowFeature(Window.FEATURE_NO_TITLE);     /* 设置为全屏模式 */ getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREENWindowManager.LayoutParams.FLAG_FULLSCREEN); myView = new BallView(this);       //设置显示GameSurfaceView视图setContentView(myView);    }//end of onCreate()       //触笔事件public boolean onTouchEvent(MotionEvent event)    {    return true;    }       //按键按下事件 public boolean onKeyDown(int keyCode KeyEvent event)    {    switch (keyCode)        {    //菜单按键-设为初始菜单case KeyEvent.KEYCODE_MENU:    myView.resetGame();        //重新开始    break;    //中间按键    case KeyEvent.KEYCODE_DPAD_CENTER:    myView.ball_isRun = !myView.ball_isRun;//开始//暂停        break;//左方向键  case KeyEvent.KEYCODE_DPAD_LEFT:            if(myView.ball_isRun){        if(myView.board_left<=myView.board_x_move)            {    myView.board_left=0;        myView.board_right=myView.board_length;        }else{        myView.board_left-=myView.board_x_move;                myView.board_right-=myView.board_x_move;}}                 break;//右方向键case KeyEvent.KEYCODE_DPAD_RIGHT:if(myView.ball_isRun){        if(screenWidth-myView.board_right<=myView.board_x_move ){                    myView.board_left=screenWidth-myView.board_length;                                    myView.board_right=screenWidth;    }else{                    myView.board_left+=myView.board_x_move;                                        myView.board_right+=myView.board_x_move;            }            }            break;            //上方向键    case KeyEvent.KEYCODE_DPAD_UP:        if(myView.ball_isRun){        if( myView.board_alterable_top==myView.board_default_top){        myView.board_alterable_top-=myView.boardYadd;                myView.board_alterable_bottom-=myView.boardYadd;                }            }            break;          //下方向键       case KeyEvent.KEYCODE_DPAD_DOWN:    if(myView.ball_isRun){    if( myView.board_alterable_top==myView.board_default_top-myView.boardYadd )    {                    myView.board_alterable_top=myView.board_default_top;    myView.board_alterable_bottom=myView.board_alterable_top+myView.board_thickness;                }            }    break;  //返回键        case KeyEvent.KEYCODE_BACK:    this.finish();    break;  }//end switch    return false;    }    //按键弹起事件public boolean onKeyUp(int keyCode KeyEvent event)    {        return true;    }public boolean onKeyMultiple(int keyCode int repeatCount KeyEvent event)    {    return true;    }}

解决方案

kaishi.setOnClickListener(new Button.OnClickListener(){        public void onClick(View v){            DisplayMetrics dm = new DisplayMetrics();            getWindowManager().getDefaultDisplay().getMetrics(dm);            screenWidth = dm.widthPixels;            screenHeight = dm.heightPixels;                         setTitle(""宽""+screenWidth+""  高""+screenHeight);            requestWindowFeature(Window.FEATURE_NO_TITLE);             getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREENWindowManager.LayoutParams.FLAG_FULLSCREEN);                 `myview = new BallView(this);`    //错误在这里             setContentView(myview);        }

这里面的这个`myview = new BallView(dazhuankuaiActivity.this);

解决方案二：
myview = new BallView(this);这个错了this代表的是一个listerner
应该使用dazhuankuaiActivity.this
因为BallView构造方法需要的是一个Context对象