Android Imageview on top of LinearLayout - android

I want to display an image on top of linearlayout
I have tried wrapping it in Framelayout and Relative layout but it doesn't seem to work.
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:src="#drawable/cricle" />
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:orientation="vertical"
android:padding="20dp"
android:background="#color/blue"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textStyle="bold"
android:gravity="center"/>
</LinearLayout>
</FrameLayout>


You can use ConstraintLayout for this. You'll have to add a constraint to the LinearLayout for its top, depending on what else you have in there.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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">
<LinearLayout
android:id="#+id/linear_layout"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:background="#ffffff80"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</LinearLayout>
<ImageView
android:id="#+id/imageView2"
android:layout_width="128dp"
android:layout_height="128dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:src="#drawable/your_drawable"
app:layout_constraintBottom_toTopOf="#id/linear_layout"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#id/linear_layout" />
</android.support.constraint.ConstraintLayout>


make your relative layout width match_parent and set margin top for linear layout
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:background="#color/blue"
android:orientation="vertical"
android:padding="20dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textStyle="bold"/>
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:src="#drawable/cricle"/>
</RelativeLayout>


Try to use match_parent and layout_marginTop
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#aaaaaa"
android:orientation="vertical"
android:padding="20dp"
android:layout_marginTop="70dp" >
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textStyle="bold"
android:gravity="center"
/>
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_gravity="center_horizontal"
android:src="#drawable/circle" />
</RelativeLayout>
</FrameLayout>

Related

Cardview does not match parent using recycler view and Linear Layout

I am using recycler view for my search items but now the cardview appears smaller than how it displays in the design editor when i debugg or at runtime. This is my cardview xml file which when the app is running it will be contained within a recycler view.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<GridLayout
android:layout_gravity="center"
android:id="#+id/my_gridLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:alignmentMode="alignMargins"
android:columnCount="1"
android:columnOrderPreserved="false"
android:orientation="horizontal">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_columnWeight="1"
android:layout_rowWeight="1"
app:cardElevation="4dp"
app:cardCornerRadius="16dp"
android:layout_margin="2dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:padding="15dp"
android:orientation="vertical">
<ImageView
android:layout_gravity="left"
android:background="#drawable/ic_launcher_background"
android:id="#+id/productImage"
android:layout_width="60dp"
android:layout_height="60dp"
/>
<TextView
android:text="productName goes here"
android:id="#+id/productCat"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="10sp"
android:layout_marginTop="12dp"/>
</LinearLayout>
</androidx.cardview.widget.CardView>
</GridLayout>
</LinearLayout>
</LinearLayout>
Below is the Activity main xml file that will contain the cardview at runtime. I have attached a screenshots of how it appears at runtime here
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat
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:background="#color/white"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="125dp"
app:queryBackground="#drawable/bg_light_sky_blue"
app:submitBackground="#drawable/bg_light_sky_blue"
android:background="#drawable/bg_light_sky_blue"
android:orientation="vertical">
<ImageView
android:layout_width="32dp"
android:layout_height="27dp"
android:layout_marginLeft="10dp"
android:onClick="OptionsClick"
android:src="#drawable/ic_baseline_menu_24">
</ImageView>
<ImageView
android:onClick="CartClick"
android:layout_width="27dp"
android:layout_height="27dp"
android:layout_marginRight="10dp"
android:src="#drawable/ic_baseline_shopping_cart_24"
android:layout_gravity="right"
android:layout_marginTop="-29dp">
</ImageView>
<LinearLayout
android:layout_marginTop="22dp"
android:gravity="center"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<SearchView
android:iconifiedByDefault="false"
android:queryHint="#string/search_hint"
android:id="#+id/mSearch"
android:layout_height="38dp"
android:layout_width="349dp"
android:background="#drawable/bg_white_rounded">
<requestFocus/>
</SearchView>
</LinearLayout>
</LinearLayout>
<androidx.recyclerview.widget.RecyclerView
android:background="#color/white"
android:id="#+id/myRecycler"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical">
</androidx.recyclerview.widget.RecyclerView>
</androidx.appcompat.widget.LinearLayoutCompat>

Sticky view with vertical scrolling using constraint layout or any other way in android

The red portion is wrap content and can be expanded, depends on how much data it contains. The green part/view always sticks between red and white. The screen is vertically scrollable.
THE attached XML code having scrollview and layout weight but it divides the screen into two parts from the middle, which is not as per the requirement.
Please suggest how to achieve this.
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.cardview.widget.CardView
android:id="#+id/card_img_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:elevation="10dp"
app:cardBackgroundColor="#color/back_screen_color_list"
app:cardElevation="10dp"
app:cardUseCompatPadding="true"
app:contentPadding="20dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/frm_club_img_wrapper"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="#drawable/circle_border_orange_bg">
<ImageView
android:id="#+id/img_club"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_gravity="center"
android:contentDescription="#string/img_desc"
app:srcCompat="#drawable/ic_logo_img_white" />
</FrameLayout>
<de.meinverein.app.view.RegularFontTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp"
android:layout_toRightOf="#+id/frm_club_img_wrapper"
android:text="Jetzt Profil\nverfolständigen"
android:textColor="#color/black"
android:textSize="#dimen/h1_lbl_size" />
</RelativeLayout>
</androidx.cardview.widget.CardView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="2">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="#0C0F12">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_marginLeft="40dp"
android:layout_marginTop="50dp"
android:orientation="vertical">
<ImageView
android:id="#+id/img_club1"
android:layout_width="#dimen/dashboard_logo_width"
android:layout_height="#dimen/dashboard_logo_height"
android:layout_marginBottom="20dp"
android:contentDescription="#string/img_desc"
app:srcCompat="#drawable/ic_logo_img_white" />
<de.meinverein.app.view.BoldFontTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="MEINVEREIN"
android:textColor="#color/refs_btn"
android:textSize="#dimen/dashboard_app_txt_size" />
<de.meinverein.app.view.BoldFontTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_marginTop="30dp"
android:text="Hallo Daniel,\ngerade nichts Neues!"
android:textColor="#color/white"
android:textSize="#dimen/list_view_item_txt_size_h1" />
</LinearLayout>
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="#F6F6F6">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rvAnimals"
android:layout_width="match_parent"
android:layout_marginTop="20dp"
android:layout_height="match_parent"/>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rvAdnimals"
android:layout_below="#+id/rvAnimals"
android:layout_width="match_parent"
android:layout_marginTop="20dp"
android:layout_height="match_parent"/>
</RelativeLayout>
</LinearLayout>
</RelativeLayout>
</ScrollView>

You can use constraint layout inside a nestedScrollView like this :
<?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent" android:layout_height="match_parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/redPortion"
android:layout_width="match_parent"
android:layout_height="wrap_content" //Red Portion
android:orientation="vertical"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<com.google.android.material.card.MaterialCardView
android:id="#+id/green_sticky_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="#+id/redPortion" //Green Sticky View
app:layout_constraintBottom_toBottomOf="#+id/redPortion"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
/>
<LinearLayout
android:id="#+id/whitePortion"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" //White Portion
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/redPortion"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>
Use any layout you want for your red, white and green views.
I hope This helps.

RecyclerView creating extra space even when width is matchparent and height is wrap content

I am very confused why my recyclerview has this huge extra space between it. I am still new to design in Android and will appreciate feedback.
Here is my student_layout to be displayed in the recyclerview
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="74dp"
android:layout_marginTop="6dp"
android:orientation="horizontal"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.8"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<LinearLayout
android:layout_width="174dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="#+id/username"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/usernamePaddingTop"
android:textColor="#color/_black"
android:textSize="#dimen/usernameTextSize"
tools:text="Student" />
</LinearLayout>
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:textSize="15sp"
android:paddingTop="4dp"
android:textColor="#color/grey"/>
<androidx.appcompat.widget.AppCompatButton
android:id="#+id/login"
android:layout_width="#dimen/loginWidth"
android:layout_height="#dimen/loginHeight"
android:layout_weight="1"
android:visibility="gone"
android:paddingLeft="#dimen/loginPadding"
android:paddingRight="#dimen/loginPadding"
android:drawableStart="#drawable/blue_button"
android:background="#drawable/blue_background" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
My MainFragment with a Recyclcer view
<LinearLayout
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:id="#+id/main"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.main.MainFragment">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/studentlogs"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:listitem="#layout/student_logs_fragment"
/>
</LinearLayout>
The image on my emulator

change android:layout_width="match_parent" to android:layout_width="wrap_content" and android:layout_height="match_parent" to android:layout_height="wrap_content" in student_layout xml file.

<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_parent"
android:layout_height="wrap_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
You have to try wrap_parent instead of match_parent in constraintLayout.

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_parent"
android:layout_height="wrap_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="74dp"
android:layout_marginTop="6dp"
android:orientation="horizontal"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.8"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<LinearLayout
android:layout_width="174dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="#+id/username"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/usernamePaddingTop"
android:textColor="#color/_black"
android:textSize="#dimen/usernameTextSize"
tools:text="Student" />
</LinearLayout>
<TextView
android:id="#+id/time"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:textSize="15sp"
android:paddingTop="4dp"
android:textColor="#color/grey"/>
<androidx.appcompat.widget.AppCompatButton
android:id="#+id/login"
android:layout_width="#dimen/loginWidth"
android:layout_height="#dimen/loginHeight"
android:layout_weight="1"
android:visibility="gone"
android:paddingLeft="#dimen/loginPadding"
android:paddingRight="#dimen/loginPadding"
android:drawableStart="#drawable/blue_button"
android:background="#drawable/blue_background" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
Replace the code at student_layout

How to overlap imageview on view in android

I am a beginner in Android.
I want to make this.
but I dont know how to make this...
Mine is this
I want to overlap the bus(ImageView) on the line(View).
And this is my code...
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
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"
android:layout_margin="30dp"
android:orientation="vertical"
tools:context=".MainActivity">
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/tabLayout"/>
<ImageView
android:id="#+id/busImage"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_below="#+id/tabLayout"
android:src="#drawable/ic_directions_bus_24dp"/>
</RelativeLayout>
activity_custom.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="8">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="2">
<View
android:id="#+id/line1"
android:layout_width="5dp"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_weight="1"
android:background="#color/colorDS"/>
<View
android:id="#+id/line2"
android:layout_width="5dp"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_weight="1"
android:background="#color/colorDS"/>
</RelativeLayout>
<View
android:id="#+id/view"
android:layout_width="0dp"
android:layout_height="match_parent" />
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:layout_weight="6">
<TextView
android:id="#+id/stNm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"/>
<TextView
android:id="#+id/arsId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/stNm"
android:textSize="13dp"/>
</RelativeLayout>
</LinearLayout>

You can achieve this layout using RecyclerView. you need to put bus image in each item of RecyclerView and handle visibility accordingly.
Here is item layout for RecyclerView.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="100dp"
xmlns:app="http://schemas.android.com/apk/res-auto">
<View
android:id="#+id/line1"
android:layout_width="5dp"
android:layout_height="match_parent"
app:layout_constraintStart_toStartOf="parent"
android:background="#ff0000"
android:layout_marginStart="32dp"/>
<TextView
android:id="#+id/stNm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintStart_toEndOf="#id/line1"
android:layout_marginStart="40dp"
android:text="testzczczc"
android:textSize="20dp"/>
<TextView
android:id="#+id/arsId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintStart_toEndOf="#id/line1"
app:layout_constraintTop_toBottomOf="#id/stNm"
android:layout_marginStart="40dp"
android:text="tesdfsfsfsst"
android:textSize="20dp"/>
<ImageView
android:id="#+id/busImage"
android:layout_width="40dp"
android:layout_height="40dp"
android:src="#drawable/bus"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="#id/line1"
app:layout_constraintEnd_toEndOf="#id/line1"/>
</android.support.constraint.ConstraintLayout>
here you need to handle visibility of busImage.

How do I get an imageView and textview to both fill the layout when setting bitmap programmatically?

What I want is for qrcodetext to fit and display all the text in qrcode_layout and have qrimageView to fill the rest of qrcode_layout? But my layout below has the entire qrimageView cover qrcode_layout. I tried a bunch of other variations but without success.
Here is what it looks like.
Here is what I want it to look like.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical"
android:id="#+id/qrcodelayout">
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/qrimageView"
android:layout_gravity="center_horizontal"
android:layout_marginTop="8dp" />
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/qrcodetext"
android:gravity="center"
android:layout_gravity="center_horizontal"
android:layout_marginTop="4dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</RelativeLayout>

Use following code. Align your textview to bottom and then align your Qrcode Image above text:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/qrcodetext"
android:gravity="center"
android:layout_alignParentBottom="true"
android:layout_marginTop="4dp" />
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/qrimageView"
android:layout_gravity="center_horizontal"
android:layout_above="#id/qrcodetext"
android:layout_alignParentTop="true"
android:layout_marginTop="8dp" />
</RelativeLayout>

I think what i have understand you want is below: Plz check and tell me:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical"
android:id="#+id/qrcodelayout">
<TextView
android:layout_width="match_parent"
android:layout_height="50dp"
android:id="#+id/qrcodetext"
android:gravity="center"
android:layout_weight="1"
android:layout_gravity="center_horizontal"
android:layout_marginTop="4dp" />
<LinearLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_weight="1">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/qrimageView"
android:layout_gravity="center_horizontal"
android:layout_marginTop="8dp" />
</LinearLayout>
</LinearLayout>
<!--<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>-->
</RelativeLayout>

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