Android 加减框

最近项目中用到了很多对元素(商品,物件)的加减框的需求,在此做个笔记以后用到了,直接拿来用.废话不多说直接进入正题.

需求:

1. 框中默认数字为"1",最大"99",可增删减;
2. 最小单位为"1"时,减号-变为灰色,点击减号-框中数字不变仍然为"1";
3. 最大单位为"99"时,加号+变为灰色,点击加号+框中数字不变仍然为"99".

 布局文件如下:

drawable配置文件如下:

icon资源文件需要小伙伴自己搞一套

 主要逻辑功能如下:

private void initView() {

        binding.ivElementSub.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String numStr = binding.etElementCount.getText().toString().trim();
                if (numStr.isEmpty()) {
                    numStr = "1";
                }
                int num = Integer.parseInt(numStr);
                num--;
                if (num <= 1) {
                    num = 1;
                }
                binding.etElementCount.setText(Integer.toString(num));
            }
        });

        binding.ivElementAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String numStr = binding.etElementCount.getText().toString().trim();
                if (numStr.isEmpty()) {
                    numStr = "1";
                }
                int num = Integer.parseInt(numStr);
                num++;
                if (num >= 99) {
                    num = 99;
                }
                binding.etElementCount.setText(Integer.toString(num));
            }
        });

        binding.etElementCount.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void afterTextChanged(Editable editable) {
                String countStr = editable.toString().trim();
                if (countStr.isEmpty()) {
                    countStr = "1";
                }
                int elementCount = Integer.parseInt(countStr);
                if (elementCount <= 1 ) {
                    binding.ivElementSub.setImageResource(R.mipmap.icon_element_un_sub);
                    binding.ivElementAdd.setImageResource(R.mipmap.icon_element_add);
                } else if (elementCount >= 99) {
                    binding.ivElementSub.setImageResource(R.mipmap.icon_element_sub);
                    binding.ivElementAdd.setImageResource(R.mipmap.icon_element_un_add);
                } else {
                    binding.ivElementSub.setImageResource(R.mipmap.icon_element_sub);
                    binding.ivElementAdd.setImageResource(R.mipmap.icon_element_add);
                }
            }
        });
    }

完.