[紧急求助]android背景颜色不起作用

在app中的activity的配置文件中，<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
<!--    <include layout="@layout/view_title"/>-->    <RelativeLayout
        android:id="@+id/title_view11"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:background="@color/blue2">        <!--标题-->
        <TextView
            android:id="@+id/tv_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:gravity="center_vertical"
            android:text=""
            android:textColor="@color/black1"
            android:textSize="20sp" />        <!--切换下箭头-->
        <ImageButton
            android:id="@+id/ib_arrow"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="5dp"
            android:layout_toRightOf="@id/tv_title"
            android:cropToPadding="true"
            android:adjustViewBounds="true"
            android:background="@null"
            android:scaleType="centerCrop"
            android:paddingTop="5dp"
            android:paddingBottom="5dp"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:src="@drawable/ic_arrow_down_gray"
             />        <!--返回按钮-->
        <ImageButton
            android:id="@+id/ib_back"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:cropToPadding="true"
            android:adjustViewBounds="true"
            android:background="@null"
            android:scaleType="centerCrop"
            android:paddingTop="5dp"
            android:paddingBottom="5dp"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:src="@drawable/ic_back"
            android:visibility="gone"/>        <!--返回文字-->
        <TextView
            android:id="@+id/tv_back"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:textColor="@color/white"
            android:textSize="@dimen/text_small"
            android:visibility="gone" />        <!--右title-->
        <TextView
            android:id="@+id/tv_right"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:layout_marginRight="10dp"
            android:padding="5dp"
            android:textColor="@color/white"
            android:textSize="13sp"
            android:visibility="gone"/>        <ImageButton
            android:id="@+id/ib_right"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:padding="5dp"
            android:cropToPadding="true"
            android:adjustViewBounds="true"
            android:background="@null"
            android:scaleType="centerCrop"
            android:paddingTop="5dp"
            android:paddingBottom="5dp"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:layout_marginRight="10dp"
            android:visibility="gone"/>        <!--分隔线-->
        <View
            android:id="@+id/v_split"
            style="@style/line_style"
            android:layout_alignParentBottom="true"/>    </RelativeLayout>
    <com.github.jdsjlzx.recyclerview.LRecyclerView
        android:id="@+id/lrv_task"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/white"
        android:layout_below="@id/title_view11"/>
</LinearLayout>设置了RelativeLayout title_view11 的背景是蓝色，但是打开app的时候，发现背景色变成了灰色。 其他地方没有设置过背景色。 而且在LRecyclerView有添加header, header中也有一个RecyclerView， 该RecyclerView中的adapter xml配置文件中
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">    <LinearLayout android:id="@+id/ll_task_type"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:paddingTop="5dp"
        android:paddingBottom="5dp"
        android:background="@drawable/bg_blue_hudu_5dp"
        android:gravity="center">        <TextView android:id="@+id/tv_task_type_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="15sp"
            android:textColor="@color/black1"
            android:maxLines="1"
            android:ellipsize="end"
            android:text=""/>    </LinearLayout></LinearLayout>
其中tv_task_type_title的字体颜色是黑色的， 打开app后，发现字体颜色是白色或者透明色， activity中的任何地方也没有改动tv_task_type_title字体颜色的地方
求助大神帮助。