Quelle  widget_messages.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/widget_title"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#eaeaea"
    android:orientation="vertical">

    <!-- absolutely do not use attr references for colors in this file! -->
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:background="@color/md_theme_light_primary"
        android:paddingLeft="16dp"
        android:paddingRight="0dp">

        <!-- do not use app:tint here! -->
        <ImageView
            android:id="@+id/widget_edit"
            android:layout_width="56dp"
            android:layout_height="48dp"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:scaleType="centerInside"
            android:src="@drawable/ic_chat_bubble_bitmap_24dp"
            android:tint="@color/md_theme_light_onPrimary"
            tools:ignore="UseAppTint" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:layout_toEndOf="@+id/widget_edit"
            android:text="@string/app_name"
            android:textColor="@color/md_theme_light_onPrimary"
            android:textSize="20sp" />

    </RelativeLayout>

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <ListView
            android:id="@+id/widget_list"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

        <TextView
            android:id="@+id/empty_view"
            style="@style/Threema.TextAppearance.EmptyView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:paddingLeft="16dp"
            android:paddingRight="16dp"
            android:text="@string/no_unread_messages"
            android:textColor="@color/md_theme_light_onSurface" />

    </FrameLayout>

</LinearLayout>