Toolbar问题

toolbar 设置paddingtop 一直报错

    
    
    

现以下错误

    FATAL EXCEPTION: main Process:
    android.view.InflateException: Binary XML file line #2: Error inflating class android.support.v7.widget.Toolbar
    Caused by: java.lang.reflect.InvocationTargetException
    Caused by: java.lang.UnsupportedOperationException: Can't convert to dimension: type=0x1

错误来源:Can't convert to dimension: type=0x1 找不到dimension
原因 android:paddingTop="@dimen/tool_bar_top_padding" 只定义在values-21文件夹中, 到5.0以下系统运行时就会出现该错误

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