android绘制3*3游戏界面，并实现在其上添加字

[b]绘制3*3游戏界面，并实现在其上添加字

创建ProjActivity类继承Activity类

public class ProjActivity extends Activity{
    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        MyGridView2 mgv = new MyGridView2(this);
        getWindow().setContentView(mgv);
        //设置View处于触摸模式是获得焦点
        mgv.setFocusableInTouchMode(true);
    }
}

在Mainfest.xml中

<activity
            android:label="@string/app_name"
            android:name=".ProjActivity " >
            
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>



MyGridView2类

public class MyGridView2 extends View{
     //定义列数
     private int cols = 3;
     //x轴的偏移量
     private int offset_x;
     //y轴的偏移量
     private int offset_y;
     //小单元格的宽度
     private int smallCellSize;
     //大单元格的宽度
     private int bigCellSize;
     //当前的单元格
     private Rect curCell = new Rect();
     private int x;
     private int y;
     //保存输入的数据
     private int nums[][] = new int[cols][cols];
     public MyGridView2(Context context){
         super(context);
     }

     public boolean onKeyDown(int keyCode, KeyEvent event){
          if(keyCode >= 8 && keyCode <= 16){
              setNumValue(keyCode - 7);
          }
          invalidate();//重新再画一次
          return super.onKeyDown(keyCode,event);
     }

     @Override
     public boolean onTouchEvent(MotionEvent event){
          //获取当前单元格的左上角的坐标
          invalidate(curCell);
          x = (int)((event.getX() - offset_x) / smallCellSize) * smallCellSize + offset_x;
          y = (int)((event.getY() - offset_y) / smallCellSize) * smallCellSize + offset_y;
          //修改矩形的尺寸
          curCell.set(x,y,x+smallCellSize,y+smallCellSize);
          //设置当前单元格为脏数据
          invalidate(curCell);//要求重新绘制curCell
          return super.onTouchEvent(event);
         
     }

      @Override
      protected void onDraw(Canvas canvas){
           protected void onDraw(Canvas canvas){
               super.onDraw(canvas);
               //获取画布的尺寸
               int w,h;
               w = getWidth();
               h = getHeight();
               //计算偏移量
               //如果是h>w
               if(h>w){
                   offset_x = 20;
                   bigCellSize = w - offset_x * 20;
                   smallCellSize = bigCellSize / cols;
                   offset_y = (h - bigCellSize) / 2;
               }else{
                   offset_y = 20;
                   bigCellSize = bigCellSize / cols;
                   offset_x = (w - bigCellSize) / 2;
               }

               //画线
               //定义线的样式
               Paint linePaint = new Paint();
               linePaint.setColor(Color.GREEN);
               //画水平线
               for(int i=0;i<=cols;i++){
                    canvas.drawLine(offset_x,offsex_y + i * smallCellSize, offset_x + bigCellSize, offset_y + i * smallCellSize, linePaint);
                }
                for(int i=0;i<=cols;i++){
                    canvas.drawLine(offset_x + i * smallCellSize, offset_y, offset_x + i * smallCellSize, offset_y + bigCellSize, linePaint);
                }

                //画当前的单元格
                Paint curCellPaint = new Paint();
                curCellPaint.setColor(Color.argb(160,255,0,0));
                canvas.drawRect(curCell,curCellPaint);

                //画数字
                Paint textPaint = new Paint();
                textPaint.setTextAlign(Paint.Align.CENTER);//放在中间
                textPaint.setTextSize((int)(0.75 * smallCellSize));
                 textPaint.setColor(Color.GREEN);


                for(int i=0;i<cols;i++){
                   for(int j=0;j<cols;j++){
                   float x = offset_x + j * smallCellSize + smallCellSize / 2;
                   float_y = offset_y + i * smallCellSize + smallCellSize / 2 - (fm.ascent + fm.descent) / 2;
        
                   canvas.drawText(getNumString(nums[i][j]), x,y,textPaint);
                  }
               }
              
               Log.d("ProjActivity","调用onDraw");
    }

    //把数字转化为字符串
    private String getNumString(int num){
        if(num == 0){
            return "";
        }else{
            return num + "";
        }
    }

    //设置数组的值
    private void setNumValue(int value){
         int ax,ay;
         ax = (y - offset_y) / smallCellSize;
         ay = (x - offset_x) / smallCellSize;
         nums[ax][ay] = value;
    }
}






























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