一个高仿闲鱼键自定义数字键盘特效

Posted 2020-10-03 android 开发

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博客地址：

http://www.jianshu.com/p/be68facfc4b8

仿造android端闲鱼发布选择价格数字键盘，自定义数字键盘

技术分享

public class MyKeyBoardView extends KeyboardView {
    private Context  mContext;
    private Keyboard mKeyBoard;

    public MyKeyBoardView(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.mContext = context;
    }

    public MyKeyBoardView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        this.mContext = context;
    }

    /**
     * 重新画一些按键
     */
    @Override
    public void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        mKeyBoard = this.getKeyboard();
        List<Key> keys = null;
        if (mKeyBoard != null) {
            keys = mKeyBoard.getKeys();
        }

        if (keys != null) {
            for (Key key : keys) {
                // 数字键盘的处理
                if (key.codes[0] == -4) {
                    drawKeyBackground(R.drawable.bg_keyboardview_yes, canvas, key);
                    drawText(canvas, key);
                }
            }
        }
    }

    private void drawKeyBackground(int drawableId, Canvas canvas, Key key) {
        Drawable npd = mContext.getResources().getDrawable(
                drawableId);
        int[] drawableState = key.getCurrentDrawableState();
        if (key.codes[0] != 0) {
            npd.setState(drawableState);
        }
        npd.setBounds(key.x, key.y, key.x + key.width, key.y
                + key.height);
        npd.draw(canvas);
    }

    private void drawText(Canvas canvas, Key key) {
        Rect bounds = new Rect();
        Paint paint = new Paint();
        paint.setTextAlign(Paint.Align.CENTER);


        paint.setAntiAlias(true);

        paint.setColor(Color.WHITE);
        if (key.label != null) {
            String label = key.label.toString();

            Field field;

            if (label.length() > 1 && key.codes.length < 2) {
                int labelTextSize = 0;
                try {
                    field = KeyboardView.class.getDeclaredField("mLabelTextSize");
                    field.setAccessible(true);
                    labelTextSize = (int) field.get(this);
                } catch (NoSuchFieldException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
                paint.setTextSize(labelTextSize);
                paint.setTypeface(Typeface.DEFAULT_BOLD);
            } else {
                int keyTextSize = 0;
                try {
                    field = KeyboardView.class.getDeclaredField("mLabelTextSize");
                    field.setAccessible(true);
                    keyTextSize = (int) field.get(this);
                } catch (NoSuchFieldException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
                paint.setTextSize(keyTextSize);
                paint.setTypeface(Typeface.DEFAULT);
            }

            paint.getTextBounds(key.label.toString(), 0, key.label.toString()
                    .length(), bounds);
            canvas.drawText(key.label.toString(), key.x + (key.width / 2),
                    (key.y + key.height / 2) + bounds.height() / 2, paint);
        } else if (key.icon != null) {
            key.icon.setBounds(key.x + (key.width - key.icon.getIntrinsicWidth()) / 2, key.y + (key.height - key.icon.getIntrinsicHeight()) / 2,
                    key.x + (key.width - key.icon.getIntrinsicWidth()) / 2 + key.icon.getIntrinsicWidth(), key.y + (key.height - key.icon.getIntrinsicHeight()) / 2 + key.icon.getIntrinsicHeight());
            key.icon.draw(canvas);
        }

    }
}

增加随机数字键盘增加速记数字键盘，用于输入安全级别高的密码输入

private void randomKeyboardNumber() {
        List<Keyboard.Key> keyList = mKeyboardNumber.getKeys();
        // 查找出0-9的数字键
        List<Keyboard.Key> newkeyList = new ArrayList<Keyboard.Key>();
        for (int i = 0; i < keyList.size(); i++) {
            if (keyList.get(i).label != null
                    && isNumber(keyList.get(i).label.toString())) {
                newkeyList.add(keyList.get(i));
            }
        }
        // 数组长度
        int count = newkeyList.size();
        // 结果集
        List<KeyModel> resultList = new ArrayList<KeyModel>();
        // 用一个LinkedList作为中介
        LinkedList<KeyModel> temp = new LinkedList<KeyModel>();
        // 初始化temp
        for (int i = 0; i < count; i++) {
            temp.add(new KeyModel(48 + i, i + ""));
        }
        // 取数
        Random rand = new Random();
        for (int i = 0; i < count; i++) {
            int num = rand.nextInt(count - i);
            resultList.add(new KeyModel(temp.get(num).getCode(),
                    temp.get(num).getLable()));
            temp.remove(num);
        }
        for (int i = 0; i < newkeyList.size(); i++) {
            newkeyList.get(i).label = resultList.get(i).getLable();
            newkeyList.get(i).codes[0] = resultList.get(i)
                    .getCode();
        }

        mKeyboardView.setKeyboard(mKeyboardNumber);
    }