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how to ensure the min space between two views in Relativelayout

I have two TextViews in a RelativeLayout. One to the left and the other one to the right. Both of them shows a string which may become very long. I want to make a min space of 10dp between two TextViews and let the right one have ellipse if no enough space.
I have below layout definition which does not work. The right TextView may cover the first one if it is very lone.
<RelativeLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerVertical="true"
android:layout_marginLeft="3dp">
<TextView
android:id="#+id/left_one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="7dp"
android:gravity="bottom"
android:text=""/>
<TextView
android:id="#+id/right_one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="8dp"
android:layout_alignParentRight="true"
android:layout_marginRight="10dp"
android:gravity="center"
android:maxLines="1"
android:ellipsize="end"
/>
</RelativeLayout>
The only way I can do is to set the max length to the right one. But this is not what I want because if the left one is short, i want the right one to be longer than the maxWidth.
And when I added "toRightOf" this work but the textView width becomes too long for a short string shown in it. That is not acceptable

add Add android:layout_toRightOf="#+id/left_one in right_one textview
remove android:layout_alignParentRight="true" from right_one textview
replace android:layout_marginRight="10dp" by android:layout_marginLeft="10dp" in right_one textview
For right_one textview to remain right if it is short replace right_one textview portion by
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginLeft="10dp"
android:layout_alignParentBottom="true"
android:layout_toRightOf="#+id/left_one>
<TextView
android:id="#+id/right_one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:gravity="center"
android:maxLines="1"
android:ellipsize="end"
/>
</RelativeLayout>

You can do like this.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="1">
<TextView
android:id="#+id/left_one"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="7dp"
android:gravity="bottom"
android:layout_weight="0.3"
android:text="Left text "/>
<TextView
android:id="#+id/right_one"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:gravity="center"
android:maxLines="1"
android:ellipsize="end"
android:layout_weight="0.7"
android:layout_marginLeft="10dp"
android:text="edkjfcnrdskjvkjrdfvsxsdcndsjkvnjksdnvkj
sdjkvbksdbvkj zskjvn jsdnbjkvfdbde"/>
</LinearLayout>

Add:
android:layout_toLeftOf="#+id/right_one"
android:layout_marginRight="10dp"
to your left_one TextView.

Make 2 TextViews have the same height

I have 2 TextView one on top of the other. When they have the same text they have the same height but when one has more text from the other he will get bigger.
<LinearLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:layout_weight="1"
android:paddingLeft="8dp"
android:paddingTop="12dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Math, Civics"
android:id="#+id/teaches"
android:layout_weight="1"
android:background="#A4D34A" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Computer Science"
android:id="#+id/learns"
android:layout_weight="1"
android:background="#D22ACE" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="5$/hour"
android:id="#+id/rate" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="32dp"
android:layout_marginRight="8dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Start Chat"
android:id="#+id/textView9"
android:layout_marginRight="8dp"
android:textStyle="italic"
android:layout_centerVertical="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>
</LinearLayout>
How can I make them stay in the same height no matter what?

You have a couple of options: You can provide equal weights to the two textviews
<TextView
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"/>
OR You can use give fixed heights to both views.
OR You can set MaxLines(Maximmum lines) attribute for the text view to be of a particular value.

Define a fixed value for yout layout_height like 24dp or something best in an dimens.xml like that:
<dimen name="textview_height">24dp</dimen>
and in your layout put both layout_height to :
#dimen/textview_height
Another option would be to set the first to set both to wrap_content and get the MeasuredHeight from both of them, then take the greater value and apply it to both TextViews

layout element control in Android

I want to layout 3 element Button , TextView , Button on the bar like this
[Button1] --- TextView --- [Button2]
2 button are always anchor fixed in left and right screen(padding 4dp) ,and TextView is center (change width depend on screen size),They should be apply for all screen size(not scaled in larger screen). How can I do it??

It would look something like this.-
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true" />
</RelativeLayout>
Notice that you still need to set other properties such as texts, ...

You can use LinearLayout with android:weightSum
Try Like this, By using android:weightSum, you can divide how much space for Button and textView.. And it will automatically adjust in all the density devices.
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="10" >
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:layout_margin="4dp"
android:layout_weight="3"
android:text="LeftButton" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:padding="4dp"
android:layout_weight="4"
android:gravity="center"
android:text="Center TextView text" />
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:layout_margin="4dp"
android:layout_weight="3"
android:text="Right Button" />
</LinearLayout>

android:weightSum work fine for me, I resolved all my troubles :)

Android RelativeLayout with wrap_content truncates some children

I have a RelativeLayout whose width/height is set to wrap_content. However, the button in the bottom right is truncated on its lower side.
Changing the RelativeLayout's paddingBottom doesn't help, neither does adding a marginBottom to the button.
Any ideas?
Here's my code:
<RelativeLayout
android:id="#+id/sign_up_phase_enteraddress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:paddingTop="10dp"
android:paddingRight="10dp"
android:paddingBottom="10dp"
android:paddingLeft="10dp"
android:background="#ff6aa639"
>
<TextView
android:id="#+id/sign_up_signuphere"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginBottom="29dp"
android:text="#string/sign_up_signuphere"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/sign_up_emaillabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/sign_up_signuphere"
android:layout_alignLeft="#id/sign_up_signuphere"
android:layout_alignBaseline="#+id/sign_up_email"
android:text="#string/sign_up_emailaddress"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/sign_up_email"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="46dp"
android:layout_below="#id/sign_up_signuphere"
android:layout_toRightOf="#id/sign_up_emaillabel"
android:ems="10"
android:inputType="textEmailAddress" >
<requestFocus />
</EditText>
<Button
android:id="#+id/sign_up_signup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/sign_up_haveaccount"
android:layout_alignRight="#id/sign_up_email"
android:layout_below="#id/sign_up_email"
android:text="#string/sign_up_signup" />
<TextView
android:id="#+id/sign_up_haveaccount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#id/sign_up_emaillabel"
android:layout_marginTop="27dp"
android:layout_below="#id/sign_up_email"
android:text="#string/sign_up_haveaccount"
android:textAppearance="?android:attr/textAppearanceSmall" />
</RelativeLayout>
...and this is what it looks like in the emulator:
Any thoughts on how I can get the bottom of my button to show?
TIA!

My fast idea is to set button bottom border to height of text on the left by using xml code
android:layout_alignBottom="#+id/sign_up_haveaccount"
because you've setted layout_below option already. However your xml code is quite not proper :) I will try write here better xml code for you, later.
Well, I found your problem. And I was searching for solution.
I setted for textview new padding bottom because button was aligned to this textview basline. I know that it could be a nice hack but I coudln't find andy good way to handle it :)
According to your layout I changed behaviour for edittext to make it stretchable. Also I grouped all elements into 3 groups. Each one per row to make it more readable.
Also do not forget that first 2 lines about xmls.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/sign_up_phase_enteraddress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="#ff6aa639"
android:paddingBottom="10dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingTop="10dp" >
<!-- 1 row -->
<RelativeLayout
android:id="#+id/row1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="29dp" >
<TextView
android:id="#+id/sign_up_signuphere"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sign_up_signuphere"
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>
<!-- 2 row -->
<RelativeLayout
android:id="#+id/row2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/row1" >
<TextView
android:id="#+id/sign_up_emaillabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/sign_up_email"
android:text="#string/sign_up_emailaddress"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/sign_up_email"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="20dp"
android:layout_centerVertical="true"
android:layout_toRightOf="#+id/sign_up_emaillabel"
android:inputType="textEmailAddress" >
<requestFocus />
</EditText>
</RelativeLayout>
<!-- 3 row -->
<RelativeLayout
android:id="#+id/row3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/row2" >
<TextView
android:id="#+id/sign_up_haveaccount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="27dp"
android:paddingBottom="15dp"
android:text="#string/sign_up_haveaccount"
android:textAppearance="?android:attr/textAppearanceSmall" />
<Button
android:id="#+id/sign_up_signup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/sign_up_haveaccount"
android:layout_alignParentRight="true"
android:text="#string/sign_up_signup" />
</RelativeLayout>
</RelativeLayout>

This is happening because of your padding , you have given 10 dp padding in bottom and your button view doesn't have enough space.Remove padding and check it .

how to separate textviews in android?

It is a simple question but I don't know how to do it because I'm new in android.
I have two TextViews in a relative layout and when the first TextView getting bigger it writes on the other TextView which I want to avoid it. How can I do it ?
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="first"
android:gravity="left"/>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="second"
android:layout_alignParentRight="true"/>
</RelativeLayout>
but when the text = firstfirstfirst.... it overrides the second textview.

You need to give you TextViews ids. Since you're using a RelativeLayout you can use layout_toLeftOf and layout_toRightOf, but you only need to use one of them.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_toLeftOf="#+id/textView2"
android:gravity="left"
android:text="firstfirstfirstfirstfirstfirsitseirodsifjdsoijfoisddsefdfadafdafad" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_alignParentRight="true"
android:text="second" />

give some advice:
first you can set the left textview's max width using android:maxWidth="" to control the left size, but if the size bigger than the size the text will become like this:text...
or you need make the left and right area cleanly, for example:
<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="2" >
<TextView
android:id="#+id/left"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_weight="1"
android:text="firstdasssssssssssssssssssssssssssssssssssssssssssssssssssssssss" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_weight="1"
android:gravity="left"
android:text="secondsdasdasdarerewrwcxcadasdasdsadsdasdasdadadsd" />
it make the left and right half area, also you can change the android:weightSum size.