一.layout属性
1.首先在res/values/attrs.xml文件中,定义declare-styleable
2.在Java文件中获取属性值
final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RoundTopLayout, defStyle, 0);
GapSize = a.getDimension(R.styleable.RoundTopLayout_gapsize, GapSize);
MidWidth = a.getDimension(R.styleable.RoundTopLayout_centerwidth, MidWidth);
Paint_Diameter = a.getDimension(R.styleable.RoundTopLayout_linesize, Paint_Diameter);
LineColor = a.getColor(R.styleable.RoundTopLayout_linecolor, LineColor);
BackColor = a.getColor(R.styleable.RoundTopLayout_backcolor, BackColor);
a.recycle();
3.布局文件自定义命名空间,属性赋值
二.主题style(方便整个项目用一套属性,不必每次用控件都要copy)
1.首先在res/values/attrs.xml文件中,定义attr
2.然后再res/values/styles/xml中添加全局属性style,然后引入到项目所用theme中
<item name="backcolor">#ff0000
<item name="linecolor">#00ff00
<item name="linesize">10dp</item>
<item name="gapsize">40dp</item>
<item name="centerwidth">150dp</item>
<item name="tab_supplier_string">@string/tab_supplier_dy</item>
<item name="tab_home">@drawable/tab_home_normal</item>
<item name="tab_supplier">@drawable/tab_supplier_normal</item>
<item name="tab_activity">@drawable/expb_show</item>
<item name="tab_demand">@drawable/tab_demand_normal_dy</item>
<item name="tab_my">@drawable/tab_my_normal</item>
<item name="tab_font_color">@drawable/tab_font_color_dy</item>
<item name="roundTopLayoutStyle">@style/CustomRoundTopLayoutStyle</item>
AndroidManifest.xml 如下,用的是deyangStyle
3.java中使用R.attr.roundTopLayoutStyle
if (attrs != null) {
final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RoundTopLayout, R.attr.roundTopLayoutStyle, 0);
GapSize = a.getDimension(R.styleable.RoundTopLayout_gapsize, GapSize);
MidWidth = a.getDimension(R.styleable.RoundTopLayout_centerwidth, MidWidth);
Paint_Diameter = a.getDimension(R.styleable.RoundTopLayout_linesize, Paint_Diameter);
LineColor = a.getColor(R.styleable.RoundTopLayout_linecolor, LineColor);
BackColor = a.getColor(R.styleable.RoundTopLayout_backcolor, BackColor);
a.recycle();
}
三.layout style
1.res/values/styles/xml中添加style
<item name="linecolor">#00ff00
<item name="linesize">10dp</item>
<item name="gapsize">40dp</item>
<item name="centerwidth">150dp</item>
2.layout 中使用style
优先级顺序
- 首先获取给定的AttributeSet中的属性值
- 如果找不到,则去AttributeSet中style(你在写布局文件时定义的style=”@style/xxxx”)指定的资源获取
- 如果找不到,则去defStyleAttr以及defStyleRes中的默认style中获取
- 最后去找的是当前theme下的基础值
四.提供set和get方法
public void setLineColor(int lineColor) {
this.lineColor = lineColor;
paint.setColor(lineColor);
invalidate();
}
总结,完善的自定义控件,必须提供这四种属性设置方式