暴露您view中所有影响可见外观的属性或者行为。

•通过XML添加和设置样式

•通过元素的属性来控制其外观和行为，支持和重要事件交流的事件监听器

详细步骤见：Android 自定义View步骤

效果图展示：

支持的样式

可以通过XML定义影响外边和行为的属性如下

边框圆角值，边框颜色，分割线颜色，边框宽度，密码长度，密码大小，密码颜色

<declare-styleable name="PasswordInputView"> <attr name="borderWidth" format="dimension"/> <attr name="borderColor" format="color"/> <attr name="borderRadius" format="dimension"/> <attr name="passwordLength" format="integer"/> <attr name="passwordWidth" format="dimension"/> <attr name="passwordColor" format="color"/> <attr name="passwordRadius" format="dimension"/> </declare-styleable>

同时支持原来EditText功能，可以获得数据值，数字键盘设置等

绘制逻辑的主要代码

protected void onDraw(Canvas canvas) { int width = getWidth(); int height = getHeight(); // 外边框 RectF rect = new RectF(0, 0, width, height); borderPaint.setColor(borderColor); canvas.drawRoundRect(rect, borderRadius, borderRadius, borderPaint); // 内容区 RectF rectIn = new RectF(rect.left + defaultContMargin, rect.top + defaultContMargin, rect.right - defaultContMargin, rect.bottom - defaultContMargin); borderPaint.setColor(Color.WHITE); canvas.drawRoundRect(rectIn, borderRadius, borderRadius, borderPaint); // 分割线 borderPaint.setColor(borderColor); borderPaint.setStrokeWidth(defaultSplitLineWidth); for (int i = 1; i < passwordLength; i++) { float x = width * i / passwordLength; canvas.drawLine(x, 0, x, height, borderPaint); } // 密码 float cx, cy = height/ 2; float half = width / passwordLength / 2; for(int i = 0; i < textLength; i++) { cx = width * i / passwordLength + half; canvas.drawCircle(cx, cy, passwordWidth, passwordPaint); } }