java - How to set the same Button size and label for our screen in android -

am try fit buttons, textviews etc., in relative layout.and using header , footer linear layout(vertical). screen looks diff. in tablet device, , looks diff. in mobile device why?

coding xml:

<relativelayout 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:paddingbottom="@dimen/activity_vertical_margin" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" tools:context=".mainactivity" >  <linearlayout     android:id="@+id/linearlayout1"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_alignparenttop="true"     android:layout_centerhorizontal="true"     android:layout_margintop="26dp"     android:orientation="vertical" >      <textview         android:id="@+id/textview1"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="center"         android:text="header part" /> </linearlayout>  <linearlayout     android:id="@+id/linearlayout2"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_alignparentbottom="true"     android:layout_alignright="@+id/linearlayout1"     android:orientation="vertical" >      <textview         android:id="@+id/textview2"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="center"         android:layout_marginleft="61dp"         android:layout_margintop="79dp"         android:text="footer part" /> </linearlayout>  <textview     android:id="@+id/textview3"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_alignleft="@+id/linearlayout1"     android:layout_below="@+id/linearlayout1"     android:layout_marginleft="26dp"     android:layout_margintop="65dp"     android:text="name" />  <textview     android:id="@+id/textview4"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_alignleft="@+id/textview3"     android:layout_below="@+id/textview3"     android:layout_margintop="47dp"     android:text="password" />  <edittext     android:id="@+id/edittext1"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_aligntop="@+id/textview3"     android:layout_marginleft="19dp"     android:layout_torightof="@+id/textview4"     android:ems="10"     android:inputtype="textpersonname" > </edittext>  <edittext     android:id="@+id/edittext2"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_alignleft="@+id/edittext1"     android:layout_aligntop="@+id/textview4"     android:layout_toleftof="@+id/button2"     android:ems="10"     android:inputtype="textpassword" />  <button     android:id="@+id/button1"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_above="@+id/linearlayout2"     android:layout_alignleft="@+id/textview4"     android:layout_marginbottom="36dp"     android:text="submit" />  <button     android:id="@+id/button2"     style="?android:attr/buttonstylesmall"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_alignbaseline="@+id/button1"     android:layout_alignbottom="@+id/button1"     android:layout_alignright="@+id/linearlayout2"     android:layout_marginright="48dp"     android:text="cancel" /> 

if want set screen orientation:

setrequestedorientation (activityinfo.screen_orientation_portrait); 

put above code after setcontentview(r.layout.activity_main);

you see more options other screen_orientation_portrait there. looking @ question headline , description find confused.

you need read wrap_content, fill_parent , match_parent attributes in xml layout file. learn more how screen size of screen. there many tutorials same available online.

you can check out sites vogella or android hive.