android - How to position a login box centered on application start? -

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i new android , trying build login box, , experience troubles. created 2 textes (username, password) , 2 text-boxes next them, style login box area.

but unfortunately elements jump , down in correlation upper , lower bars, shown when user touches screen.

how can realize centered login box?

username , password field jump around link: maximize image

here code: 

<framelayout android:layout_width="match_parent"     android:layout_height="match_parent"     android:fitssystemwindows="true">      <linearlayout android:id="@+id/fullscreen_content_controls"         style="?buttonbarstyle"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:layout_gravity="bottom|center_horizontal"         android:background="@color/black_overlay"         android:orientation="horizontal"         tools:ignore="uselessparent">            <button android:id="@+id/dummy_button"             style="?buttonbarbuttonstyle"             android:layout_width="0dp"             android:layout_height="wrap_content"             android:layout_weight="1"             android:text="@string/login_button" />      </linearlayout>      <relativelayout         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="center"         android:gravity="center_vertical|center_horizontal">          <tablelayout             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_gravity="center"             android:baselinealigned="false"             android:layout_alignparenttop="false"             android:layout_alignparentleft="false"             android:layout_alignparentbottom="false"             android:layout_centerinparent="true">              <tablerow                 android:layout_width="match_parent"                 android:layout_height="match_parent">                  <textview                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:text="@string/login_username"                     android:id="@+id/textview" />                  <edittext                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:id="@+id/edittext"                     android:layout_column="1" />             </tablerow>              <tablerow                 android:layout_width="match_parent"                 android:layout_height="match_parent">                  <textview                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:text="@string/login_password"                     android:id="@+id/textview2"                     android:layout_column="0" />                  <edittext                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:id="@+id/edittext2"                     android:layout_column="1" />             </tablerow>          </tablelayout>     </relativelayout>  </framelayout>

there no need of table layout done relative , linearlayout. http://www.androidhive.info/2011/10/android-login-and-registration-screen-design/


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