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控件实现清单： 

1）集成于EditText的输入框控件：PasswordInputView.java
2）数字键盘工具类：NumKeyboardUtil.java
3）xml文件：number.xml
4）attrs样式
5）layout文件

具体内容：

PasswordInputView.java

public class PasswordInputView extends EditText{
 private int textLength;
 
 private int borderColor;
 private float borderWidth;
 private float borderRadius;
 
 private int passwordLength;
 private int passwordColor;
 private float passwordWidth;
 private float passwordRadius;
 
 private Paint passwordPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
 private Paint borderPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
 
 private final int defaultSplitLineWidth = 1;
 
 public PasswordInputView(Context context, AttributeSet attrs) {
  super(context, attrs);
  final Resources res = getResources();
 
  final int defaultBorderColor = res.getColor(R.color.line_color);
  final float defaultBorderWidth = res.getDimension(R.dimen.dimen_1px);
  final float defaultBorderRadius = res.getDimension(R.dimen.dimen_6);
 
  final int defaultPasswordLength = 6;
  final int defaultPasswordColor = res.getColor(R.color.normal_text_color);
  final float defaultPasswordWidth = res.getDimension(R.dimen.dimen_6);
  final float defaultPasswordRadius = res.getDimension(R.dimen.dimen_6);
 
  TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.PasswordInputView, 0, 0);
  try {
   borderColor = a.getColor(R.styleable.PasswordInputView_borderColor, defaultBorderColor);
   borderWidth = a.getDimension(R.styleable.PasswordInputView_borderWidth, defaultBorderWidth);
   borderRadius = a.getDimension(R.styleable.PasswordInputView_borderRadius, defaultBorderRadius);
   passwordLength = a.getInt(R.styleable.PasswordInputView_passwordLength, defaultPasswordLength);
   passwordColor = a.getColor(R.styleable.PasswordInputView_passwordColor, defaultPasswordColor);
   passwordWidth = a.getDimension(R.styleable.PasswordInputView_passwordWidth, defaultPasswordWidth);
   passwordRadius = a.getDimension(R.styleable.PasswordInputView_passwordRadius, defaultPasswordRadius);
  } finally {
   a.recycle();
  }
 
  borderPaint.setStrokeWidth(borderWidth);
  borderPaint.setColor(borderColor);
  passwordPaint.setStrokeWidth(passwordWidth);
  passwordPaint.setStyle(Paint.Style.FILL);
  passwordPaint.setColor(passwordColor);
 
  setSingleLine(true);
 }
 
 @Override
 protected void onDraw(Canvas canvas) {
  int width = getWidth();
  int height = getHeight();
 
  // 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);
  }
 }
 
 @Override
 protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
  super.onTextChanged(text, start, lengthBefore, lengthAfter);
  this.textLength = text.toString().length();
  invalidate();
 }
 
 public int getBorderColor() {
  return borderColor;
 }
 
 public void setBorderColor(int borderColor) {
  this.borderColor = borderColor;
  borderPaint.setColor(borderColor);
  invalidate();
 }
 
 public float getBorderWidth() {
  return borderWidth;
 }
 
 public void setBorderWidth(float borderWidth) {
  this.borderWidth = borderWidth;
  borderPaint.setStrokeWidth(borderWidth);
  invalidate();
 }
 
 public float getBorderRadius() {
  return borderRadius;
 }
 
 public void setBorderRadius(float borderRadius) {
  this.borderRadius = borderRadius;
  invalidate();
 }
 
 public int getPasswordLength() {
  return passwordLength;
 }
 
 public void setPasswordLength(int passwordLength) {
  this.passwordLength = passwordLength;
  invalidate();
 }
 
 public int getPasswordColor() {
  return passwordColor;
 }
 
 public void setPasswordColor(int passwordColor) {
  this.passwordColor = passwordColor;
  passwordPaint.setColor(passwordColor);
  invalidate();
 }
 
 public float getPasswordWidth() {
  return passwordWidth;
 }
 
 public void setPasswordWidth(float passwordWidth) {
  this.passwordWidth = passwordWidth;
  passwordPaint.setStrokeWidth(passwordWidth);
  invalidate();
 }
 
 public float getPasswordRadius() {
  return passwordRadius;
 }
 
 public void setPasswordRadius(float passwordRadius) {
  this.passwordRadius = passwordRadius;
  invalidate();
 }
}

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