background为圆角的表框，dp转Px，Px转dp

圆角边框

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <!-- android:shape="" 表示是圆角矩形还是椭圆等等 -->
    <solid android:color="@color/white" />               
    <stroke
        android:width="0.5dp"
        android:color="@color/gray6" />

    <corners android:radius="5dp" />

</shape>

  <solid android:color="@color/white" /> 这个是边框内的颜色

 android:color="@color/gray6"这个是边框的边缘颜色

dp转px
public static int dip2px(Context context,float dipValue){
//获取密度比例

final float scale = this.getResources().getDisplayMetrics().density;

return (int)(dipValue*scale+0.5f);

}

px转dp

public static int px2dip(Context context,float pxValue){
//获取密度比例

final float scale = this.getResources().getDisplayMetrics().density;

return (int)(pxValue/scale+0.5f);

}