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how to display textview below button in relativeLayout

in the below xml layout, i have two buttons at the same position and they will do their function based on the visibilty set. now i tried to place two textviews
below the buttons, i want the text views to be below both buttons so I used
android:layout_below="#id/actConnect2_btn_connect"
but at run time when the connect-button is visible the text view appears below it, and if pair-button is visible it overlap
how to display the textview below both buttons?
Note: i know that i can use android:layout:marginTop but i want to solve it without it
code:
<Button
android:id="#+id/actConnect2_btn_pair"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/actConnect2_tv_label_devClass"
android:layout_centerInParent="true"
android:text="#string/str_pair"/>
<Button
android:id="#+id/actConnect2_btn_connect"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/str_connect"
android:layout_below="#+id/actConnect2_tv_label_devClass"
android:layout_alignParentStart="true" />
<TextView
android:id="#+id/actConnect2_tv_label_uuids"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/actConnect2_btn_connect"
android:text="Service's UUID: ">
</TextView>
<TextView
android:id="#+id/actConnect2_tv_uuids"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/actConnect2_tv_label_uuids">
</TextView>

Put both buttons in a LinearLayout then put the textview below the LinearLayout

take both button in one layout
<RelativeLayout android:id="#+id/relativeButton"
android:layout_width="wrap_content"
android:layout_below="#id/actConnect2_tv_label_devClass"
android:layout_height="wrap_content">
<Button
android:id="#+id/actConnect2_btn_pair"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="#string/str_pair"/>
<Button
android:id="#+id/actConnect2_btn_connect"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/str_connect"
android:layout_alignParentStart="true" />
</RelativeLayout>
and use this for your textview
android:layout_below="#id/relativeButton"

You have to place the buttons in a Layout (any type and arrange them accordingly)
Assign an ID to that layout.
Place the textView below that layout ID.

How to move button little up?

I am trying to move all these buttons a little up to top, like about 50dp.
here is my code for first button
android:id="#+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_above="#+id/button2"
android:layout_centerVertical="true"
android:layout_marginBottom="10dp"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp"
android:layout_marginTop="10dp"
android:background="#drawable/button1"
android:text="Load game"
android:textColor="#C3C3C3"
android:textStyle="bold|italic"/>

Try adding android:layout_marginBottom="50dp"
to your layout where are your all buttons

padding property is used to set the internal of the widget (for example paddingtop=10 then your text in button will be 10px below in the rect of button )
margine property is relatived to the Parent ViewGroup of the widget

Try to put your buttons in a linear layout and set margin or padding to it like this:
<LinearLayout
android:id="#+id/searchLinearLayout"
android:paddingTop="50dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
</LinearLayout>

how to add a button on right of a textview

i want to add a button on right of a textview and if textview grows,button would be still there.i used FrameLayout or RelativeLayout but they didn't work,please help me.
a layout like this image http://www.8pic.ir/images/97364937705465965477.png

Try with LinearLayout by giving orientation as horizontal.
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="#+id/textView_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight=".5"
android:text="your text"
/>
<Button
android:id="#+id/button_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight=".5"
android:text="button" />
</LinearLayout>

It is not possible directly and it is not good practice also for Android development. Though if it is your requirement, then you can count lines and number of character in last line at run time and decide the position of your button by using either frame or relative layout.

How to create Textview in left side and two button in right side in same line?

In Android lay out how to create a TextView in leftside and two button on right side with same line.
Which layout is better to use for this layout Table Or Relative ?

You can use a LinearLayout to achieve this
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#ffffff"
android:layout_weight="1"
android:text="a text"/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button 1">
</Button>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button 2">
</Button>
</LinearLayout>

Its is better to use Relative Layout for this kind of view. use android:layout_alignParentRight="true" to Align Right and android:layout_alignParentLeft="true" to Align Left. e.g
RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="8dp" >
<TextView
android:id="#+id/type"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Large Text"
android:textColor="#76D4F7"
android:textStyle="bold"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>

The easiest would be to use a LinearLayout (orientation horizontal) as pointed out in the previous answer. You can also set the property under Layout Weight to 1 for each button and textview. Then set the layout width for all those object to 0. This will enable you to proportionally scale how much of the area is taken up horizontally by each object. So for example if you set the Layout Weight on the Textview to 2 and each button to 1, then the textview will take up 50% of the space horizontally (2/(2+1+1)). This makes it easier to scale the objects on different device and hopefully starts to address the question of which is the best layout to use in this case.

Center multiple items in a RelativeLayout without putting them in a container?

I have a RelativeLayout containing a pair of side-by-side buttons, which I want to be centered within the layout. I could just put the buttons in a LinearLayout and center that in the RelativeLayout, but I want to keep my xml as clean as possible.
Here's what I tried, this just puts the "apply" button in the center and the "undo" button to the left of it:
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15sp">
<TextView
android:id="#+id/instructions"
android:text="#string/instructions"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="15sp"
android:layout_centerHorizontal="true"
/>
<Button
android:id="#+id/apply"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="#string/apply"
android:textSize="20sp"
android:layout_below="#id/instructions"
/>
<Button
android:id="#+id/undo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="#string/undo"
android:textSize="20sp"
android:layout_toLeftOf="#id/apply"
android:layout_below="#id/instructions"
/>
</RelativeLayout>

android:gravity will align the content inside the view or layout it is used on.
android:layout_gravity will align the view or layout inside of his parent.
So adding
android:gravity="center"
to your RelativeLayout should do the trick...
Like this:
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_marginTop="15sp">
</RelativeLayout>

Here is an extension of BrainCrash's answer. It is a non nested option that groups and centers all three horizontally and vertically. In addition, it takes the top TextView and centers it horizontally across both buttons. If desired, you can then center the text within the TextView with android:gravity="center". I also removed the margins, added color, and set the RelativeLayout height to fill_parent to highlight the layout. Tested on API 11.
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:background="#android:color/black"
>
<TextView
android:id="#+id/instructions"
android:text="TEST"
android:textSize="20sp"
android:background="#android:color/darker_gray"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignLeft="#+id/undo"
android:layout_alignRight="#+id/apply"
android:gravity="center"
/>
<Button
android:id="#+id/apply"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="APPLY"
android:textSize="20sp"
android:layout_below="#id/instructions"
/>
<Button
android:id="#+id/undo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="UNDO"
android:textSize="20sp"
android:layout_toLeftOf="#id/apply"
android:layout_below="#id/instructions"
/>
</RelativeLayout>

android:layout_gravity="center"
will almost give what you're looking for.

Here is a combination of the above answer's that solved my specific situation:
Centering two separate labels within a layout that also includes a button in the left most position of the same layout (button, label, label, from left to right, where the labels are centered relative to the layout containing all three views - that is, the button doesn't push the labels off center).
I solved this by nesting two RelativeLayout's, where the outer most layout included the
Button and an Inner-RelativeLayout.
The Inner-RelativeLayout contained the two text labels (TextView's).
Here is a snippet that provides the details of how the centering and other layout stuff was done:
see: RelativeLayout Gravity not applied? and
Gravity and layout_gravity on Android
for the difference's between gravity and layout_gravity.
Tweak the paddingLeft on the btn_button1 Button to see that the TextView's do not move.
(My apologies to havexz for the downvotes. I was too hasty in thinking that just b/c your suggestions didn't solve the exact question being ask, that they do help to solve very similar situations (the answer here solves a very specific situation, and only the combination of all these answer's solved my problem. I tried upvoting, but it won't let me unless I edit the answer's, which I don't want to do.)
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/rl_outer"
android:layout_width="fill_parent"
android:layout_height="50dip"
android:background="#FF0000FF">
<Button
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/btn_button1"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="#FF00FF00"
android:text="<"
android:textSize="20sp"
android:paddingLeft="40dip"/>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/rl_inner"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="#FFFF00FF"
android:layout_centerInParent="true"
android:gravity="center">
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/tv_text1"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="#FF505050"
android:textSize="20sp"
android:textColor="#FFFFFFFF"
android:text="Complaint #"
android:gravity="center"/>
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/tv_text2"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="#FF505050"
android:textSize="20sp"
android:textColor="#FFFFFFFF"
android:layout_toRightOf="#id/tv_text1"
android:gravity="center"/>
</RelativeLayout>
</RelativeLayout>

LinearLayout is a good option. Other than that there are options like create an invisible view and center that and then align left button to the left it and right on the right of it. BUT those are just work arounds.