java.lang.NumberFormatException: Invalid float

java.lang.NumberFormatException: Invalid float: "30.0dp"错误

原因：attrs.xml如下

<declare-styleable name="Title">

<attr name="titles" format="string" />

<attr name="titlecolor" format="color" />

<attr name="titlesize" format="dimension" />

<attr name="leftBackground" format="reference|color" />

<attr name="rightBackground" format="reference|color" />

</declare-styleable>

layout文件：<hy.mingancai.tongqutang.view.ActivityTitles

android:id="@+id/childstar_msg_title_view"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:background="@color/lanse"

android:padding="5dp"

title:rightBackground="@drawable/map"

title:titlecolor="@color/white"

title:titles="我的"

title:titlesize="10dp" >

</hy.mingancai.tongqutang.view.ActivityTitles>

自定义文件

TypedArray ta = context

.obtainStyledAttributes(attrs, R.styleable.Title);

float titleSize = ta.getFloat(R.styleable.Title_titlesize, 0);

错误就处在ta.getFloat这个方法中，因为attr文件中titlesize属性的参数类型是dimension，So ，正确的写法是：

float titleSize = ta.getDimension(R.styleable.Title_titlesize, 0);