xml - Button not shown in Android layout -

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i trying create layout edittext,textview , 2 buttons.

here xml layout:

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical"     android:padding="25sp" >      <edittext         android:id="@+id/etcommands"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:hint="type command.."         android:inputtype="textpassword" />      <linearlayout         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:orientation="horizontal"         android:weightsum="20" >          <button             android:id="@+id/bresults"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:layout_weight="80"             android:text="try command" />          <togglebutton             android:paddingbottom="10sp"             android:checked="true"             android:id="@+id/tbpassword"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:layout_weight="50"             android:text="togglebutton" />     </linearlayout>      <textview         android:id="@+id/tvresults"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:gravity="center"         android:text="invalid" />  </linearlayout>

for reason 2 buttons not shown on layout? going wrong in this?

 <linearlayout     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:orientation="horizontal" >      <button         android:id="@+id/bresults"         android:layout_width="0dip"         android:layout_weight="1"         android:layout_height="wrap_content"          android:text="try command" />      <togglebutton         android:paddingbottom="10sp"         android:checked="true"         android:id="@+id/tbpassword"          android:layout_width="0dip"         android:layout_weight="1"         android:layout_height="wrap_content"          android:text="togglebutton" /> </linearlayout>

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