Develop Reference

Why my apps give error when I am using scrollview

What is the matter here?
when I add scroll view here my apps give error. I have to put below and out of the scrollview my webview code and my back(geri) button. but my apps not work. when I remove scrollview then my apps work again
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.user.myapplication.MainActivity"
android:orientation="horizontal">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="#+id/bn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="bn" />
<Button
android:id="#+id/deneme"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="deneme" />
<Button
android:id="#+id/denemeiki"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="denemeiki" />
</ScrollView>
<Button
android:id="#+id/geri"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="30dp"
android:layout_alignParentRight="true"
android:text="geri"
/>
<WebView
android:id="#+id/simpleWebView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="20dp" />
</RelativeLayout>

scroll view can only contain only one child view.so you have to put the views into a relative layout or linear layout or something else and then put this relative layout in scroll view.

Android - cannot center button in fragment under viewpager

Quick question. I hope
I have this content-main
<?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:background="#drawable/pozadie" >
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/button3"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="113dp" />
</RelativeLayout>
and this fragment of viewPager
<?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:background="#drawable/pozadie" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/button"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="153dp" />
</RelativeLayout>
Why cannot I center the button in fragment? It is still touching left or right border. In android studio, it is shown well. But not, when tried on phone.

Have you tried gravity or layoutGravity?
https://stackoverflow.com/a/8180931/6079360

SOLVED!
It was my fault. I forgot to change parent layout of main activity. It was set on static pixels of width and height.

Android layout objects placement

I have this simple activity in my android app but I don't know how to place my button so it appears at the same position on various screen sizes.
I want the button to always be placed at the bottom of the screen. The screenshot shown is from a phone screen. When displayed on a larger screen the button is higher up.
How can I fix this?
Thanks
See this screenshot

You can use RelativeLayout with this parameter (android:layout_alignParentBottom="true")
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="Click Me!"/>
</RelativeLayout>

You should use a RelativeLayout
If you have a RelativeLayout that fills the whole screen you should be able to use android:layout_alignParentBottom to move the button to the bottom of the screen.
If your button at the bottom doesn't show then probably the layout above it takes all the space. In this case you can put the button first in your layout file and position the rest of the layout above the views with android:layout_above.

Have a look a RelativeLayout. Use this ViewGroup and add a Button inside it with alignParentBottom
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
<Button
android:id="#+id/button_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:alignParentBottom="true"
android:text="HORAIRE"
android:layout_margins="<your_margin_in_dp>" />
</RelativeLayout>

Make footerButton.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/footer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:gravity="center" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:text="HORAIRE"
android:textColor="#ffffff"
android:textSize="20sp" />
</RelativeLayout>
And add it in all your layout file like below line:
Android Activity_Layout
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<!-- Footer aligned to bottom -->
<include layout="#layout/footer" />
<!-- Content above footer -->
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_above="#id/footer"
android:layout_below="#id/header"
android:gravity="center">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Content goes here"
android:textColor="#FFFFFF"
android:textSize="20sp" />
</RelativeLayout>
</RelativeLayout>
Hope it will solve your problem

This is what I ended up doing. Thanks to everyone who posted, it helped me get in the right direction!
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/container"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:showIn="#layout/activity_main"
tools:context="xxxx.MainActivity"
android:orientation="vertical"
android:weightSum="1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Dernières nouvelles Twitter"
android:id="#+id/textView"
android:textStyle="bold"
android:textSize="17dp"
android:paddingLeft="8dp"
android:paddingTop="6dp"
android:paddingRight="6dp"
android:paddingBottom="6dp"
android:layout_alignParentTop="true"/>
<ListView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:id="#+id/listView_tweets"
android:layout_above="#+id/buttonDisplay"
android:choiceMode="none"
android:paddingTop="25dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Horaire"
android:layout_margin="5dp"
android:id="#+id/buttonDisplay"
android:onClick="buttonGotoDisplay"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"/>
</RelativeLayout>

ViewPager does not respect order inside LinearLayout

I have this XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LinearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#color/blanco"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/verde_us" >
<ImageView
android:id="#+id/detalle_imagen_categoria"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:src="#drawable/icon_map" />
<View
android:id="#+id/View02"
android:layout_width="2dp"
android:layout_height="fill_parent"
android:background="#color/blanco" />
<TextView
android:id="#+id/text_nombre_empresa"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="5dp"
android:text="#string/text_noticias"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#color/blanco" />
</LinearLayout>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</android.support.v4.view.ViewPager>
</LinearLayout>
But when I run the app the output is other.
Any help? Thanks!

I want the tabs below the text that says "Ahumadero" In the XML
Then stop using action bar tabs. Use some other sort of tabbed indicator for your ViewPager, one where you control the position by placing it in the LinearLayout yourself. There are many open source implementations, such as PagerSlidingTabStrip.

Hide a layout when focus on it is lost in XML

I have the following xml file:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/FrameLayout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
</android.support.v4.view.ViewPager>
<LinearLayout
android:id="#+id/musicLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:gravity="center"
android:orientation="horizontal"
android:padding="10dp"
android:focusable="true"
android:visibility="visible" >
<ImageView
android:id="#+id/backward"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/backward" />
<ImageView
android:id="#+id/stop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="8dp"
android:src="#drawable/stop" />
<ImageView
android:id="#+id/pausePlay"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="8dp"
android:src="#drawable/play" />
<ImageView
android:id="#+id/forward"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="8dp"
android:paddingRight="10dp"
android:src="#drawable/forward" />
</LinearLayout>
The framelayout is for an actionbar with tabs which are the viewpager in the above layout. The actionbar works perfect. The problem that I want to solve is that the last linearlayout, which is actually a media player floating in the bottom of the screen, needs to be hidden when I press outside the linearlayout! I have tested the onfocuschangelistener in the musicLayout and onclick in the pageviewer but nothing happens! What am i doing wrong?
Edit:
In case it helps, every tab is a fragment with its own layout which is added to the viewPager.

I think the easiest solution to this problem would be to add a transparent view that matches parent of your ViewGroup. Basically, you would have the ViewPager, LinearLayout and View at the same level. You can then register an onClickListener on your transparent View and that should do the trick.
Layout should be something as simple as this :
<View android:id="#+id/transparent_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"/>