怎么在Android应用中自定义一个数字键盘与密码输入框

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();
 }
}

public class NumKeyboardUtil {
 private KeyboardView keyboardView; 
 private Keyboard k;// 数字键盘 
 private PasswordInputView ed;
 
 public NumKeyboardUtil(Activity act, Context ctx, PasswordInputView edit) { 
  this.ed = edit; 
  k = new Keyboard(ctx, R.xml.number); 
  keyboardView = (KeyboardView) act.findViewById(R.id.keyboard_view); 
  keyboardView.setKeyboard(k); 
  keyboardView.setEnabled(true); 
  keyboardView.setPreviewEnabled(true); 
  keyboardView.setOnKeyboardActionListener(listener); 
 }
 
 private OnKeyboardActionListener listener = new OnKeyboardActionListener() { 
  @Override 
  public void swipeUp() { 
  } 
 
  @Override 
  public void swipeRight() { 
  } 
 
  @Override 
  public void swipeLeft() { 
  } 
 
  @Override 
  public void swipeDown() { 
  } 
 
  @Override 
  public void onText(CharSequence text) { 
  } 
 
  @Override 
  public void onRelease(int primaryCode) { 
  } 
 
  @Override 
  public void onPress(int primaryCode) { 
  } 
  //一些特殊操作按键的codes是固定的比如完成、回退等 
  @Override 
  public void onKey(int primaryCode, int[] keyCodes) { 
    Editable editable = ed.getText(); 
    int start = ed.getSelectionStart(); 
    if (primaryCode == Keyboard.KEYCODE_DELETE) {// 回退 
      if (editable != null && editable.length() > 0) { 
        if (start > 0) { 
          editable.delete(start - 1, start); 
        } 
      } 
    }else if (primaryCode == Keyboard.KEYCODE_CANCEL) {// 完成
     hideKeyboard();
    } else { //将要输入的数字现在编辑框中 
      editable.insert(start, Character.toString((char) primaryCode)); 
    } 
  } 
 };
 
 public void showKeyboard() { 
  keyboardView.setVisibility(View.VISIBLE); 
 }
 
 public void hideKeyboard() {
  keyboardView.setVisibility(View.GONE);
 }
 
 public int getKeyboardVisible() {
  return keyboardView.getVisibility();
 }
}

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//=======在Activity成员变量中声明部分代码=======
/** 控件 */
 private PasswordInputView edtPwd;
 
//=======在Activity实例化控件部分代码=======
// 初始化控件
  edtPwd = (PasswordInputView) findViewById(R.id.trader_pwd_set_pwd_edittext);
  edtPwd.setInputType(InputType.TYPE_NULL); // 屏蔽系统软键盘
// 自定义软键盘
  if (keyboardUtil == null) keyboardUtil = new NumKeyboardUtil(this, this, edtPwd);
  edtPwd.setOnTouchListener(new OnTouchListener() {
   @Override
   public boolean onTouch(View v, MotionEvent event) {
    keyboardUtil.showKeyboard();
    return false;
   }
  });
 
//=======在Activity中重写onTouchEvent()方法，实现点击空白处隐藏软键盘=======
@Override
 public boolean onTouchEvent(MotionEvent event) {
  if(event.getAction() == MotionEvent.ACTION_DOWN){ 
    if(getCurrentFocus()!=null && getCurrentFocus().getWindowToken()!=null){
     keyboardUtil.hideKeyboard();
    }
  }
  return super.onTouchEvent(event);
 }

edtPwd.setOnFocusChangeListener(new OnFocusChangeListener() {
   @Override
   public void onFocusChange(View v, boolean hasFocus) {
    if (hasFocus) {
     // 如果系统键盘是弹出状态，先隐藏
     ((InputMethodManager) getSystemService(INPUT_METHOD_SERVICE))
     .hideSoftInputFromWindow(getCurrentFocus()
     .getWindowToken(),
     InputMethodManager.HIDE_NOT_ALWAYS);
     keyboardUtil.showKeyboard();
    } else {
     keyboardUtil.hideKeyboard();
    }
   }
  });