Android 自定义软键盘实现 数字九宫格

那就开搞吧

先来看下实现的效果图吧

实现效果 GIF

![g](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/2f753a7

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b75d04172b7e000b270f0a95e~tplv-k3u1fbpfcp-zoom-1.image)

实现代码

自定义 View 一个NineNumericKeyboardView

/**

• Author by Lyu

• Date on 2021/5/26-19:55

• Description:九宫格数字软键盘/public class NineNumericKeyboardView extends View {/*

• 列/private static final int TOTAL_COL = 3;/*

• 行*/private static final int TOTAL_ROW = 4;

private Paint HuiseBgPaint, linePaint;private Paint mTextPaint;private int mViewWidth; // 键盘宽度 private int mViewHight; // 键盘高度 private float mCellWidth, mCellHight; // 单元格宽度、高度 private Row rows[] = new Row[TOTAL_ROW];private Bitmap bitmap; // 删除按钮图片 private Paint mCutTextPaint;

//回调方法 public interface CallBack {void clickNum(String num);// 回调点击的数字

void deleteNum();// 回调删除}

private CallBack mCallBack;// 回调

public void setOnCallBack(CallBack callBack) {mCallBack = callBack;}

public NineNumericKeyboardView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);init(context);

}

public NineNumericKeyboardView(Context context, AttributeSet attrs) {super(context, attrs);init(context);

}

public NineNumericKeyboardView(Context context) {super(context);init(context);}

@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);drawLine(canvas);for (int i = 0; i < TOTAL_ROW; i++) {if (rows[i] != null)rows[i].drawCells(canvas);}}

/**

• 画 6 条直线

• @param canvas*/private void drawLine(Canvas canvas) {canvas.drawLine(0, 0, mViewWidth, 0, linePaint);canvas.drawLine(0, mCellHight, mViewWidth, mCellHight, linePaint);canvas.drawLine(0, mCellHight * 2, mViewWidth, mCellHight * 2, linePaint);canvas.drawLine(0, mCellHight * 3, mViewWidth, mCellHight * 3, linePaint);canvas.drawLine(mCellWidth, 0, mCellWidth, mViewHight, linePaint);canvas.drawLine(mCellWidth * 2, 0, mCellWidth * 2, mViewHight, linePaint);

}

/**

• 初始化画笔

• @param context*/private void init(Context context) {mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mCutTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);linePaint = new Paint(Paint.ANTI_ALIAS_FLAG);linePaint.setTextSize(1.0f);linePaint.setColor(0x90000000);

HuiseBgPaint = new Paint(Paint.ANTI_ALIAS_FLAG);HuiseBgPaint.setStyle(Paint.Style.FILL);HuiseBgPaint.setColor(Color.parseColor("#e9e9e9"));

initDate();}

private void initDate() {fillDate();}

@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);mViewWidth = w;mViewHight = h;mCellWidth = mViewWidth / TOTAL_COL;mCellHight = mViewHight / TOTAL_ROW;mTextPaint.setTextSize(mCellHight / 3);

}

private Cell mClickCell = null;private float mDownX;private float mDownY;

/**

• 触摸事件为了确定点击位置的数字*/@Overridepublic boolean onTouchEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:mDownX = event.getX();mDownY = event.getY();int col = (int) (mDownX / mCellWidth);int row = (int) (mDownY / mCellHight);measureClickCell(col, row);break;case MotionEvent.ACTION_UP:if (mClickCell != null) {// 在抬起后把状态置为默认 rows[mClickCell.i].cells[mClickCell.j].state = State.DEFAULT_NUM;mClickCell = null;invalidate();}break;}return true;}

/**

• 测量点击单元格

• @param col 列

• @param row 行*/private void measureClickCell(int col, int row) {if (col >= TOTAL_COL || row >= TOTAL_ROW)return;if (rows[row] != null) {mClickCell = new Cell(rows[row].cells[col].num, rows[row].cells[col].state, rows[row].cells[col].i,rows[row].cells[col].j);rows[row].cells[col].state = State.CLICK_NUM;if ("-5".equals(rows[row].cells[col].num)) {mCallBack.deleteNum();} else {mCallBack.clickNum(rows[row].cells[col].num);}invalidate();}}

/**

• 组 以一行为一组*/private class Row {public int j;

Row(int j) {this.j = j;}

// 一行 3 个单元格 public Cell[] cells = new Cell[TOTAL_COL];

public void drawCells(Canvas canvas) {for (int i = 0; i < cells.length; i++) {if (cells[i] != null)cells[i].drawSelf(canvas);}

}}

// 单元格 private class Cell {public String num;public State state;/**

• i = 行 j = 列*/public int i;public int j;

public Cell(String num, State state, int i, int j) {super();this.num = num;this.state = state;this.i = i;this.j = j;}

// 绘制一个单元格 如果颜色需要自定义可以修改 public void drawSelf(Canvas canvas) {switch (state) {case CLICK_NUM:// 绘制点击效果灰色背景 canvas.drawRect((mCellWidth * j), (mCellHight * i),(mCellWidth * (j + 1)), (mCellHight * (i + 1)), HuiseBgPaint);break;}if ("-5".equals(num)) {// 绘制删除图片 canvas.drawBitmap(bitmap, (float) (mCellWidth * 2.5 - bitmap.getWidth() / 2), (float) (mCellHight * 3.5 - bitmap.getHeight() / 2), HuiseBgPaint);} else {// 绘制数字 canvas.drawText(num, (float) ((j + 0.5) * mCellWidth - mTextPaint.measureText(num) / 2),(float) ((i + 0.5) * mCellHight + mTextPaint.measureText(num, 0, 1) / 2),mTextPaint);}