ProjectLaogai/app/src/main/res/layout/fragment_settings.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             tools:context=".SettingsFragment">

    <!-- TODO: Update blank fragment layout -->

    <android.support.constraint.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        <LinearLayout
                android:orientation="vertical"
                android:layout_width="match_parent"
                android:layout_height="match_parent" app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent"
        >
            <android.support.v7.widget.CardView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="9dp">
                <LinearLayout
                        android:orientation="vertical"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content">
                    <TextView
                            android:text="@string/info"
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content" android:id="@+id/txtView_Info"
                            android:typeface="sans"
                            android:textSize="18sp" android:textStyle="bold" android:fontFamily="sans-serif"
                            android:layout_margin="7dp" android:textColor="@color/colorPrimary"/>
                    <LinearLayout
                            android:orientation="vertical"
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content" android:padding="7dp">
                        <TextView
                                android:text="@string/sampleuser"
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content" android:id="@+id/txtView_User"
                                android:textSize="16sp" android:textStyle="bold"
                                android:textColor="@android:color/primary_text_light"/>
                        <TextView
                                android:text="@string/user"
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content" android:id="@+id/txtView_UserDesc"/>
                    </LinearLayout>
                    <View
                            android:id="@+id/divider2"
                            android:layout_width="match_parent"
                            android:layout_height="1dp"
                            android:background="?android:attr/listDivider"
                    />
                    <LinearLayout
                            android:orientation="vertical"
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content" android:layout_margin="7dp">
                        <TextView
                                android:text="@string/samplecourse"
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content" android:id="@+id/txtView_Course"
                                android:textSize="16sp" android:textColor="@android:color/primary_text_light"
                                android:textStyle="bold"/>
                        <TextView
                                android:text="@string/course_desc"
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content" android:id="@+id/txtView_CourseDesc"/>
                    </LinearLayout>
                </LinearLayout>
            </android.support.v7.widget.CardView>
            <android.support.v7.widget.CardView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="9dp">
                <LinearLayout
                        android:orientation="vertical"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content" android:id="@+id/linLayout_Settings">
                    <TextView
                            android:text="@string/settings"
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content" android:id="@+id/txtView_Settings"
                            android:typeface="sans"
                            android:textSize="18sp" android:textColor="@color/design_default_color_primary"
                            android:textStyle="bold" android:layout_margin="7dp" android:paddingTop="3dp"/>
                    <LinearLayout
                            android:orientation="horizontal"
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content" android:layout_margin="7dp" android:gravity="end">
                        <LinearLayout
                                android:orientation="vertical"
                                android:layout_width="wrap_content"
                                android:layout_height="wrap_content">
                            <TextView
                                    android:text="Maincolor"
                                    android:layout_width="match_parent"
                                    android:layout_height="wrap_content" android:id="@+id/textView9"
                                    android:textSize="16sp" android:textStyle="bold"
                                    android:textColor="@android:color/primary_text_light"/>
                            <TextView
                                    android:text="The main color, default is indigo"
                                    android:layout_width="match_parent"
                                    android:layout_height="wrap_content" android:id="@+id/textView8"/>
                        </LinearLayout>
                        <LinearLayout
                                android:orientation="vertical"
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content" android:layout_margin="7dp"
                                android:gravity="end">
                            <Button
                                    android:text="Button"
                                    android:layout_width="40dp"
                                    android:layout_height="40dp" android:id="@+id/button"
                                    android:textColor="@android:color/black"/>
                        </LinearLayout>
                    </LinearLayout>
                </LinearLayout>
            </android.support.v7.widget.CardView>
        </LinearLayout>
    </android.support.constraint.ConstraintLayout>
</FrameLayout>