Develop Reference

why the CoordinatorLayout show white space in the bottom?

HI I have main activity XML as below
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.CoordinatorLayout 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:background="#FFFFFF"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="#dimen/abc_action_bar_default_height_material"
android:background="#color/fcolor"
app:popupTheme="#style/AppTheme.PopupOverlay">
<TextView
android:id="#+id/toolbar_title"
style="#style/TextAppearance.AppCompat.Widget.ActionBar.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="text"
android:textColor="#color/scolor" />
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_below="#+id/toolbar"
android:background="?attr/colorPrimary"
android:elevation="2dp"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:tabGravity="fill"
app:tabMode="fixed" />
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_main" />
</android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.NavigationView
android:id="#+id/nvView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="#android:color/white"
app:headerLayout="#layout/navigation_header"
app:menu="#menu/drawer_view" />
As you can see I add my main content inside the CoordinatorLayout using Include Tag
<include layout="#layout/content_main" />
in content main XML, I have
<?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:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:showIn="#layout/actvity_main" tools:context=".Main">
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="#id/tab_layout"/>
</RelativeLayout>
then I used different XML layout have Mapview within RelativeLayout to show in the page viewer
my problem that always there's empty space in the bottom of the screen left from the CoordinatorLayout as the below image
As you can see there's white space in the bottom, the reason why I know it's from CoordinatorLayout because when I change the CoordinatorLayout background it changes the space color
it seems like my include tag not scale in hight for all the screen, even when I set
<include
layout="#layout/content_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
still the same, what I need is to make my Mapview scale and fill the bottom of the screen

In main.xml, remove android:paddingBottom="3dp".

Try this .
try in your java code
mapView.setBuiltInZoomControls(true);
int level = mapView.getZoomLevel();
MapController mc = mapView.getController();
mc.setZoom(level + 3);
and your xml
<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:layout_width="fill_parent"
android:layout_height="fill_parent">
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true" />
</RelativeLayout>
Let me know if it works for you.

look like the problem was that I adding padding value inside the java code
Thanks for everyone help me to review the padding inside my code

In content main try removing from the RelativeLayout:
android:paddingBottom="3dp"
From the ViewPager, moving:
android:layout_below="#id/tab_layout"
to the
<include layout="#layout/content_main" />
and in the ViewPager, changing:
android:layout_height="fill_parent"
to
android:layout_height="match_parent"

Android pager hides Tab layout if it's positioned on top of it

I know this seems like a repeated questions but I don't understand why I can't position Tablayout on top of my ViewPager.
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="200dp">
<android.support.design.widget.TabLayout
android:id="#+id/tl_ads"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_alignParentBottom="true"
app:tabBackground="#drawable/tab_selector"
app:tabGravity="center"
app:tabIndicatorHeight="0dp"
app:tabMaxWidth="16dp"
app:tabPadding="2dp"/>
<android.support.v4.view.ViewPager
android:id="#+id/vp_ads"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white"
android:elevation="2dp"
android:translationZ="2dp"
tools:targetApi="lollipop"/>
</RelativeLayout>
Tablayout works just fine if I replace the RelativeLayout with Linearlayout except that's not what I want.

Try below may help you.
Error here : android:layout_alignParentBottom="true"
<?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.support.design.widget.TabLayout
android:id="#+id/tl_ads"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#9ad195"
android:minHeight="?attr/actionBarSize" />
<android.support.v4.view.ViewPager
android:id="#+id/vp_ads"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/tl_ads"
android:background="#cccccc"
android:elevation="2dp"
android:translationZ="2dp"
tools:targetApi="lollipop" />

Try this:
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="200dp">
<android.support.v4.view.ViewPager
android:id="#+id/vp_ads"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white"
android:elevation="2dp"
android:translationZ="2dp"
tools:targetApi="lollipop"/>
<android.support.design.widget.TabLayout
android:id="#+id/tl_ads"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_alignParentBottom="true"
app:tabBackground="#drawable/tab_selector"
app:tabGravity="center"
app:tabIndicatorHeight="0dp"
app:tabMaxWidth="16dp"
app:tabPadding="2dp"/>
</RelativeLayout>
In a RelativeLayout, the widgets are added one on top of the other in the order in which they were declared. You had declared your tab layouts first and then declared the ViewPager. As a result of this, your tabs were being created but were being hidden by the ViewPager which occupied the entire RelativeLayout.

Where do I put my own xml code in activity_main using Androids default tab application

This is the activity_main.xml layout for Androids default tab application:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".activities.MainActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay">
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
<!-- When I add my own view here and use match_parent, it fills ENTIRE screen, even over the Toolbar. The ViewPager right above does not do this. Why? -->
</android.support.design.widget.CoordinatorLayout>
I am trying to add my own buttons/textviews/etc to my activity_main.xml but I do not know where to add them. The android.support.v4.view.ViewPager uses match_parent although it does not fit the whole screen, it expands across the entire screen besides the Toolbar area at the top. However, whenever I add my own view underneath the android.support.v4.view.ViewPager, lets say RelativeView and set it to match_parent, it expands OVER the Toolbar. This led me to believe that I should put my contents inside the ViewPager tags but that does not work either.
Where should I put my views so that they are not overlapping the Toolbar?

You can wrap your ViewPager in an RelativeLayout and you can add the view child also.
Here is the code snippet which may help you-
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorAccent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<Button
android:id="#+id/button"
android:layout_width="match_parent"
android:layout_height="48dp"
android:text="I am clickable" />
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentEnd="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentStart="true"
android:layout_below="#+id/button"
android:background="#color/colorNeutral"
android:layout_above="#+id/button2" />
<Button
android:layout_marginBottom="56dp"
android:layout_alignParentBottom="true"
android:id="#+id/button2"
android:layout_width="match_parent"
android:layout_height="48dp"
android:text="I am clickable too" />
</RelativeLayout>

ViewPager causes wrong layout display

I have added viewpager in an activity with the following layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent" android:layout_height="match_parent"
android:weightSum="1">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:layout_weight="0.45">
<include
android:id="#+id/toolbar"
layout="#layout/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.1" />
</FrameLayout>
<android.support.v4.view.ViewPager
android:id="#+id/imgdetail"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.15"
android:foregroundGravity="center_vertical|fill_vertical">
</android.support.v4.view.ViewPager>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/container1"
android:layout_weight="0.4"></FrameLayout>
</LinearLayout>
But the toolbar colour has moved and the viewpager has gone to the center of the screen.

Do you need to put the toolbar inside the frame layout. And if so, consider removing the wight for the toolbar and just leave the wrap_content.
Change the height of the layouts with weight specified to "0dip".
If all else fails consider changing the wights to whole numbers and add them to make the wight_sum of the linear_layout e.g.toolbar frame layout gets 9, view pager gets 3, frame at the bottom gets 8 and weight_sum is 20.

Its easy to implement your layout using RelativeLayout. Use RelativeLayout and make the ToolBar layout the top child and put ViewPager below "Toolbar layout".
Hope this helps.
Regards,

Try this layout
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
android:id="#+id/toolbar"
layout="#layout/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"/>
<android.support.v4.view.ViewPager
android:id="#+id/imgdetail"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="?attr/actionBarSize"/>
<FrameLayout
android:id="#+id/container1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="?attr/actionBarSize"/>
</FrameLayout>

Try it this way. Just specify the height of the elements
<?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">
<include
android:id="#+id/toolbar"
layout="#layout/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<android.support.v4.view.ViewPager
android:id="#+id/imgdetail"
android:layout_below="#id/toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:foregroundGravity="center_vertical|fill_vertical">
</android.support.v4.view.ViewPager>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/container1"
android:layout_below="#id/imgdetail">
</FrameLayout></RelativeLayout>

How to get Toolbar to overlay sibling layout (z-ordering)

For the life of me, I cannot get this Toolbar to layout on top (note: not above, but on top of) its sibling LinearLayout. The only way I can get the Toolbar to overlay its sibling is by specifying the Toolbar's elevation to be > 0, but this doesn't work for pre-5.0.
I am using a parent FrameLayout, and the child Toolbar is located after its sibling LinearLayout in the XML. What am I missing? Even the Android Studio preview pane shows the Toolbar on top of the LinearLayout
<?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"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent">
<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:id="#+id/fragment_main_container"
tools:context=".MainActivity"
tools:ignore="MergeRootFrame"
android:orientation="vertical"
>
<FrameLayout
android:layout_weight="4"
android:layout_width="match_parent"
android:layout_height="0dp">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/ic_launcher"
/>
</FrameLayout>
<ListView
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="5"
android:id="#+id/home_list_listview"
android:drawSelectorOnTop="true"
android:divider="#null"
android:dividerHeight="0dp"
tools:listitem="#layout/home_list_item"
>
</ListView>
<TextView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:text="#string/slogan"
android:gravity="center"
android:textColor="#color/colorPrimaryDark"
/>
</LinearLayout>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
android:background="#android:color/transparent"
/>
</FrameLayout>

Turns out I had a fragment committing the linear layout over the main activity, which already contained it. Oops!

That's because of FrameLayout.
If you want to use FrameLayout, the views will not relate each other.
So all you need to do is ...
set "height of toolbar" to MarginTop of LinearLayout.
Hope, it will help.