绘图画布上的2D阵列网格

以下只是一个简单的说明性示例。它没有经过优化，没有实现异常处理等。

public class PixelGridView extends View {    private int numColumns, numRows;    private int cellWidth, cellHeight;    private Paint blackPaint = new Paint();    private boolean[][] cellChecked;    public PixelGridView(Context context) {        this(context, null);    }    public PixelGridView(Context context, AttributeSet attrs) {        super(context, attrs);        blackPaint.setStyle(Paint.Style.FILL_AND_STROKE);    }    public void setNumColumns(int numColumns) {        this.numColumns = numColumns;        calculateDimensions();    }    public int getNumColumns() {        return numColumns;    }    public void setNumRows(int numRows) {        this.numRows = numRows;        calculateDimensions();    }    public int getNumRows() {        return numRows;    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        calculateDimensions();    }    private void calculateDimensions() {        if (numColumns < 1 || numRows < 1) { return;        }        cellWidth = getWidth() / numColumns;        cellHeight = getHeight() / numRows;        cellChecked = new boolean[numColumns][numRows];        invalidate();    }    @Override    protected void onDraw(Canvas canvas) {        canvas.drawColor(Color.WHITE);        if (numColumns == 0 || numRows == 0) { return;        }        int width = getWidth();        int height = getHeight();        for (int i = 0; i < numColumns; i++) { for (int j = 0; j < numRows; j++) {     if (cellChecked[i][j]) {         canvas.drawRect(i * cellWidth, j * cellHeight,   (i + 1) * cellWidth, (j + 1) * cellHeight,   blackPaint);     } }        }        for (int i = 1; i < numColumns; i++) { canvas.drawLine(i * cellWidth, 0, i * cellWidth, height, blackPaint);        }        for (int i = 1; i < numRows; i++) { canvas.drawLine(0, i * cellHeight, width, i * cellHeight, blackPaint);        }    }    @Override    public boolean onTouchEvent(MotionEvent event) {        if (event.getAction() == MotionEvent.ACTION_DOWN) { int column = (int)(event.getX() / cellWidth); int row = (int)(event.getY() / cellHeight); cellChecked[column][row] = !cellChecked[column][row]; invalidate();        }        return true;    }}

这是一个简单

Activity

public class MainActivity extends Activity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        PixelGridView pixelGrid = new PixelGridView(this);        pixelGrid.setNumColumns(4);        pixelGrid.setNumRows(6);        setContentView(pixelGrid);    }}