Develop Reference

Recyclerview cannot be scrolled?

I have this screen.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<android.support.v7.widget.RecyclerView
android:id="#+id/my_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"/>
</RelativeLayout>
<Button
android:id="#+id/btn_sync"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:onClick="DoUpload"
android:text="Sync with server"
/>
</LinearLayout>
It looks like this (which is OK):
So I add more datas, now it looks like this:
The RecyclerView cannot be scrolled, and the button is hidden. How to fix this?

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="#+id/my_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
android:layout_weight="1"/>
<Button
android:id="#+id/btn_sync"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_gravity="center_horizontal"
android:onClick="DoUpload"
android:text="Sync with server"/>
</LinearLayout >
</LinearLayout>
just copy this code and use it will be working fine

I have edited the code for you this will solve the problem and button will be at the end of RecyclerView
<?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="vertical"
android:padding="5dp">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/my_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical" />
<Button
android:id="#+id/btn_sync"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/my_recycler_view"
android:layout_gravity="center_horizontal"
android:onClick="DoUpload"
android:text="Sync with server" />
</RelativeLayout>
</LinearLayout>

Try this,
<?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"
android:padding="5dp">
<RelativeLayout
android:layout_above="#id/btn_sync"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.RecyclerView
android:id="#+id/my_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"/>
</RelativeLayout>
<Button
android:id="#+id/btn_sync"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:onClick="DoUpload"
android:text="Sync with server"
android:layout_alignParentBottom="true"
/>
</RelativeLayout>

Try using constraint layout like below
<?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="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:padding="5dp">
<android.support.v7.widget.RecyclerView
android:id="#+id/my_recycler_view"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toTopOf="#id/btn_sync"
android:scrollbars="vertical" />
<Button
android:id="#+id/btn_sync"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:onClick="DoUpload"
android:text="Sync with server" />
</android.support.constraint.ConstraintLayout>
This layout should keep the button from hiding and recyclerview will scroll when more data items are added.

used nestedScrollView
<?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="vertical">
<android.support.v4.widget.NestedScrollView
android:id="#+id/nestedScrollView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:overScrollMode="never">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</LinearLayout>

How do you position views and other UI items in a fragment layout?

I have a message interface consisting of a listview, an edit text box and a button found in a tutorial online. In my implementation of the xml it lays out perfectly with the listview above the text box and button. However, when I try to implement the layout using two fragments (1) for an audio player at the top of the screen and (2) below that for the messaging, I cannot force the text box and button to display below the list view.
How can I do that below are the XMLs.
(1) Works as expected:
<?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:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation ="vertical"
tools:context=".MainActivity"
>
<ListView
android:id ="#+id/message_list"
android:layout_weight="100"
android:layout_width="match_parent"
android:layout_height="0dp"
android:divider="#null"
/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="#+id/new_message"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="100"
android:inputType="text">
<requestFocus />
</EditText>
<Button
android:id="#+id/send_message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:text="#string/send_message"
android:textColor="#android:color/white" />
</LinearLayout>
</LinearLayout>
(2) Positions the text and button at the top of or near the top of the list view:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ListView
android:id="#+id/message_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:divider="#null" />
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="#+id/new_message"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="100"
android:inputType="text"
android:labelFor="#id/new_message" />
<Button
android:id="#+id/send_message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:text="#string/send_message"
android:textColor="#android:color/white" />
</LinearLayout>
</RelativeLayout>
Changing (2) to linear layout has not fixed my issue.

This somehow fixed my problem although it seemed not to have worked before.
<?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:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.app.MessageFragment">
<ListView
android:id ="#+id/message_list"
android:layout_weight="100"
android:layout_width="match_parent"
android:layout_height="0dp"
android:divider="#null"
/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="#+id/new_message"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="100"
android:inputType="text"
android:labelFor="#id/new_message" />
<Button
android:id="#+id/send_message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:text="#string/send_message"
android:textColor="#android:color/white" />
</LinearLayout>
</LinearLayout>

Your second layout has no constraints. You should make sure that your LinearLayout is aligned bottom and the listview is above the LinearLayout. It should be something like this :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ListView
android:id="#+id/message_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/llText"
android:divider="#null" />
<LinearLayout
android:id="#+id/llText"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_alignParentBottom="true"
android:layout_height="wrap_content">
<EditText
android:id="#+id/new_message"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="100"
android:inputType="text"
android:labelFor="#id/new_message" />
<Button
android:id="#+id/send_message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:text="Hello"
android:textColor="#android:color/white" />
</LinearLayout>
</RelativeLayout>

Android Material Design

I have a linear layout with a horizontal orientation. In the horizontal orientation I have 3 widgets ImageButton, Edittext and Fabbutton.
How can I align Imagebutton to the left and its padding to left,right,top and bottom should be same?
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"`enter code here`
android:layout_height="match_parent"
tools:context="com.example.ashwini.chatscreen.MainActivity">
<include layout="#layout/custom_toolbar"></include>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:orientation="horizontal">
<ImageButton
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_gravity="left|center_vertical"
android:layout_weight="1"
android:background="#drawable/ic_down_arrow"
android:id="#id/downButton"/>
<EditText
android:layout_width="0dp"
android:layout_height="wrap_content"
android:paddingLeft="30dp"
android:layout_weight="3"
>
<requestFocus></requestFocus>
</EditText>
<android.support.design.widget.FloatingActionButton
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="right|center_vertical"
android:src="#drawable/ic_send_message_button"
android:layout_weight="0.86"/>
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>

Try this code:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_gravity="bottom"
android:orientation="horizontal">
<EditText
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="3" />
<ImageButton
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_weight="1"
android:padding="16dp"
android:background="#drawable/down_arrow"/>
<android.support.design.widget.FloatingActionButton
android:layout_width="0dp"
android:layout_height="wrap_content"
android:src="#drawable/com_facebook_send_button_icon"
android:layout_weight="0.86"/>
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>

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>

Linear Layout does not fill the whole screen

Why the linear layout does not fill the whole screen?
As you can see I am using match parent in the linear layout.
If I delete the Scrollbar nothing changes. The button is not at the bottom of the screen.
main_activity.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/black"
tools:context="com.sarahp.demo.MainActivity">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout ----------> HERE
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/textview_demo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="32dp"
android:layout_marginTop="32dp"
android:text="#string/demo"
android:textSize="42dp"/>
<RelativeLayout
android:id="#+id/fragment_container_a"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<RelativeLayout
android:id="#+id/fragment_container_b"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:background="#color/transparent"/>
</LinearLayout>
</ScrollView>
</RelativeLayout>
F A is the fragment part.

Give android:fillViewport="true" to your ScrollView.
Your xml will looks like below. Main_Activity.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="40dp"
android:text="Test Demo"
android:textStyle="bold"
android:gravity="center"/>
<RelativeLayout
android:id="#+id/fragment1"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.5"
android:background="#drawable/border_image">
<TextView
android:layout_width="match_parent"
android:layout_height="100dp"
android:gravity="center"
android:text="Test text Fragement1" />
</RelativeLayout>
<RelativeLayout
android:id="#+id/fragment2"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.5"
>
<TextView
android:layout_width="match_parent"
android:layout_height="100dp"
android:gravity="center"
android:text="Test text Fragement2" />
</RelativeLayout>
</LinearLayout>
</ScrollView>
</RelativeLayout>

Remove the relative layout
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/textview_demo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="32dp"
android:layout_marginTop="32dp"
android:text="#string/demo"
android:textSize="42dp"/>
<RelativeLayout
android:id="#+id/fragment_container_a"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<RelativeLayout
android:id="#+id/fragment_container_b"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:background="#color/transparent"/>
</LinearLayout>
</ScrollView>