Android自定义view实现输入控件

@Override
 protected void onDraw(Canvas canvas) {
    if (text.length() > 0) {
      if (isDrawSrc) {
        super.onDraw(canvas);
      }
      canvas.drawText(text, 0, text.length(), (getMeasuredWidth() - textWidth) / 2, (getMeasuredHeight() + dy) / 2, textPaint);
    } else {
      super.onDraw(canvas);
  }
}

public void requestEtFocus() {
    catchInput.setFocusable(true);
    catchInput.setFocusableInTouchMode(true);
    catchInput.setClickable(true);
    catchInput.requestFocus();
    showSoftKeyboard(catchInput);
    catchInput.setCursorVisible(false);
    catchInput.setSelection(catchInput.length());
}

// 动态添加TextImageView 
  for (int i = 0; i < passwordLength; i++) {
      TextImageView view = new TextImageView(context);
      view.setTextSize(textSize);
      view.setTextColor(textColor);
      content.addView(view);
      if (unInputBg != 0) {
        view.setBackgroundResource(unInputBg);// 设置未输入前的背景
      }
      LinearLayout.LayoutParams params = new LinearLayout.LayoutParams((int) itemWidth, (int) itemHeight);
      if (i == 0) {
        params.setMargins((int) dpToPixel(1), 0, 0, 0);
      }
      if (i == passwordLength - 1) {
        params.setMargins(0, 0, (int) dpToPixel(1), 0);
      }
      view.setLayoutParams(params);
      views[i] = view;
      // 分割字体，给TextIamgeView绘制文字
      if (text != null && i < text.length()) {
        setItemText(text.subSequence(i, i + 1));
      }
    }
    // 输入监听
    catchInput.addTextChangedListener(new TextWatcher() {
      @Override
      public void beforeTextChanged(CharSequence s, int start, int count, int after) {

      }

      @Override
      public void onTextChanged(CharSequence s, int start, int before, int count) {
        if (s.length() > 0) {
          // index：成员变量；保存当前的输入了几个字符
          if (index > s.length()) {
            removeItemText();// 删除
          } else {
            setText(s);
            if (s.length() == passwordLength) {
              if (listener != null) {
                // 输入完成回调
                listener.onInputCodeEnd(s);
              }
            }
          }
        } else if (s.length() == 0 && index > 0) {
          removeItemText();
        }
      }

   @Override
   public void afterTextChanged(Editable s) {

  }
});