微信支付宝支付密码输入框 PassWordEditView

转载请注明出处
http://blog.youkuaiyun.com/shallcheek/article/details/51952625

GitHub地址

1、概述

类似微信支付宝支付密码输入框，可以自定义密码长度，边框颜色，背景颜色，密码颜色等。

2、思路

当初想做这个的时候首先想的是自定义一个ViewGroup 里面add 一个EditView 通过这个EditView 的内容控制ViewGroup的背景绘制。
后面为了简单就直接自定义了一个EditView 通过自己的内容控制onDraw 绘制背景

3、步骤

初始化参数

   private void init() {

       //控制最大数量 
        if (password_max_len > 12) {
            password_max_len = 12;
        }

       //初始化 Paint RectF
        passwordPaint = new Paint();
        passwordPaint.setAntiAlias(true);
        passwordRoundPaint = new Paint();
        passwordRoundPaint.setAntiAlias(true);
        rectF = new RectF();
        rectStrokeF = new RectF();


        //隐藏光标
        this.setCursorVisible(false);
        //设置最大长度
        this.setFilters(new InputFilter[]{new InputFilter.LengthFilter(password_max_len)});
        //输入类型
        setInputType(EditorInfo.TYPE_CLASS_NUMBER);
        //输入框监听
        addTextChangedListener(this);
        //隐藏EditView 输入框的默认背景
        setBackgroundColor(0x00000000);
    }

初始化绘制相应参数，在设置EditView的属性

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        width = getWidth();
        height = getHeight();
        int min = Math.min(width / password_max_len, height);
        if (passwordRadius > min / 2)
            passwordRadius = min / 2;

        rectF.top = 1;
        rectF.left = 1;
        rectF.right = width - 2;
        rectF.bottom = height - 2;

        rectStrokeF.top = 1;
        rectStrokeF.left = 1;
        rectStrokeF.right = width;
        rectStrokeF.bottom = height;

    }

onLayout在这里初始化 rectF 和rectStrokeF 即 背景和背景边框的绘制参数

获取焦点

     @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        int action = event.getAction();
        //触摸获取焦点弹出输入框
        if (action == MotionEvent.ACTION_MOVE) {
            //点击默认光标点再末尾 
            setSelection(getText().toString().length());
            setFocusable(true);
            setFocusableInTouchMode(true);
            requestFocus();
            InputMethodManager inputManager = (InputMethodManager) getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
            inputManager.showSoftInput(this, 0);
        }

        //消费掉触摸事件 
        return true;

    }

重写EditView的dispatchTouchEvent事件 默认点击就获取焦点弹出键盘 然后在消费掉触摸事件，不然双击EditView 会弹出选择复制光标

监听EditView输入框内容长度

   @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        password = s.toString();
        passWordCount = s.length();
        //是否输入完成
        isComplete = passWordCount == password_max_len;
        if (passWordChangeListener != null)
            passWordChangeListener.onTextChange();

         invalidate();
    }

添加addTextChangedListener 监听文字变化 然后再调用 invalidate() 绘制背景

背景绘制onDraw函数

首先绘制的是背景因为背景是填充完全 所以设置参数 passwordPaint.setStyle(Paint.Style.FILL);

/**
* rectStrokeF  分别是上下左右的坐标参数 在初始化参数里面初始化玩
* passwordRadius 圆角
* passwordPaint Paint配置 设置颜色等参数
**/
canvas.drawRoundRect(rectStrokeF, passwordRadius, passwordRadius, passwordPaint); 

再者绘制边框和分割线条颜色 为了让获取焦点与取消焦点有区别 所以设置了两种颜色

       //是否获取焦点
      if (isFocused()) {
            passwordPaint.setColor(lineFocusColor);
        } else {
            passwordPaint.setColor(lineColor);
        }

绘制边框线条 即一个空心得圆角矩形 passwordPaint.setStyle(Paint.Style.STROKE); 设置空心

        passwordPaint.setStrokeWidth(1);
        passwordPaint.setStyle(Paint.Style.STROKE);
        canvas.drawRoundRect(rectF, passwordRadius, passwordRadius, passwordPaint);

绘制分割线条根据颜色来设置
计算出平均间隔 然后在循环调用canvas.drawLine() 绘制线条 至于height - 3 是高度填充满的话底部会出现一届扭曲 就这样解决

         int w = width / password_max_len;
        for (int i = 0; i < password_max_len; i++) {
            canvas.drawLine(i * w + w, 1, i * w + w + 1, height - 3, passwordPaint);
        }

绘制密码圆点

    int h = getHeight() / 2;
      if (isFocusable()) {
            passwordRoundPaint.setColor(circleFocusColor);
        } else {
            passwordRoundPaint.setColor(circleColor);
        }

        //密码点
        for (int i = 0; i < passWordCount; i++) {
            canvas.drawCircle(i * w + w / 2, h, circleSize, passwordRoundPaint);
        }

同样为了区分 获取焦点和失去焦点的颜色是不一样的 然后在根据已输入的密码颜色绘制 对应数量的圆点

完整的onDraw

 @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //背景
        passwordPaint.setColor(backgroundColor);
        passwordPaint.setStyle(Paint.Style.FILL);
        canvas.drawRoundRect(rectStrokeF, passwordRadius, passwordRadius, passwordPaint);
        //边框颜色

        if (isFocused()) {
            passwordPaint.setColor(lineFocusColor);
        } else {
            passwordPaint.setColor(lineColor);
        }
        passwordPaint.setStrokeWidth(1);
        passwordPaint.setStyle(Paint.Style.STROKE);
        canvas.drawRoundRect(rectF, passwordRadius, passwordRadius, passwordPaint);

        int w = width / password_max_len;
        int h = getHeight() / 2;


        for (int i = 0; i < password_max_len; i++) {
            canvas.drawLine(i * w + w, 1, i * w + w + 1, height - 3, passwordPaint);
        }

        if (isFocusable()) {
            passwordRoundPaint.setColor(circleFocusColor);
        } else {
            passwordRoundPaint.setColor(circleColor);
        }
        //密码点
        for (int i = 0; i < passWordCount; i++) {
            canvas.drawCircle(i * w + w / 2, h, circleSize, passwordRoundPaint);// 小圆
        }

    }

这样就自定义完成

---

Attributes

name	format	java code
edit_background	color|reference	public void setBackground(int background)
edit_line_color	color|reference	public void setLineColor(int lineColor)
edit_line_focus_color	color|reference	public void setLineFocusColor(int lineFocusColor)
edit_circle_color	color|reference	public void setCircleColor(int circleColor)
edit_circle_focus_color	color|reference	public void setCircleFocusColor(int circleFocusColor)
edit_background_radius	integer	public void setPasswordRadius(int passwordRadius)
edit_circle_size	dimension|integer	public void setCircleSize(int circleSize)
edit_max_length	integer	public void setMaxLen(int password_max_len)

---

XML

       <com.chaek.android.passwordeditview.PassWordEditView
        android:layout_width="match_parent"
        android:layout_height="40dp"
        app:edit_background="#ffF5F7F9"
        app:edit_background_radius="3dp"
        app:edit_circle_color="#fa760a"
        app:edit_circle_size="5dp"
        app:edit_line_color="#ffE1E4E8"
        app:edit_line_focus_color="#ffBEC5CD"
        app:edit_max_length="6" />

---

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