Android之常见问题集锦Ⅱ

Android问题集锦Ⅰ：http://www.cnblogs.com/AndroidJotting/p/4608025.html

EditText输入内容改变事件监听

_edit.addTextChangedListener
(new TextWatcher(){
            @Override
            public void afterTextChanged
(Editable s) {
                // TODO Auto-generated method stub

            }

            @Override
            public void beforeTextChanged
(CharSequence s, int start, int count,
                    int after) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onTextChanged
(CharSequence s, int start, int before,
                    int count) {
                // TODO Auto-generated method stub
                //关键是这里,监听输入的字符串,如果大于零,则可点击,enable.
                if(s.length()>0){
                    _ok.setClickable(true);
                    _ok.setEnabled(true);
                }else{
                    _ok.setClickable(false);
                    _ok.setEnabled(false);
                }
            }
        });

在代码中设置TextView的颜色

productState.setTextColor(context.getResources().getColor(R.color.product_value_price_color));