Android Graphical layout doesnt show toggle button

Question

I'm new with android programming and i have a problem. I use Eclipse and i create a Toggle Button but in Graphical layout that doesn't show anything and it shows me this "Exception raised during rendering: -1". What can i do? I post below my code that i have used.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:padding="25dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<EditText
    android:id="@+id/etCommands"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:hint="Type a Command"
    android:password="true" />

<LinearLayout
    android:weightSum="100"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <Button
        android:layout_weight="20"
        android:id="@+id/bResults"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="Try Command" />

    <ToggleButton
        android:layout_weight="80"
        android:paddingBottom="10dp"
        android:checked="true"
        android:id="@+id/tbPassword"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        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" />

Answer 1

The recommended way to use "layout_weight" is to set the dimension to "0dp" and set the desired weight, so android will resize it:

<ToggleButton
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="80"
    android:text="ToggleButton" />

I don't think this is the reason it crashes, so you better post the entire xml

----UPDATE----------------------------------------------

I don't get any rendering error, but as your button width is set to "fill_parent" (you should use "match_parent" instead as "fill_parent" is deprecated), and there are two items in a horizontal linear layout, the second one is not visible.

Also, use "0dp" when using weights for the intended dynamic dimension.

Here is your layout fixed. I also swapped weights so your buttons look better (I think it was a bug)

<?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="25dp" >

<EditText
    android:id="@+id/etCommands"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="Type a Command"
    android:password="true" />

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:weightSum="100" >

    <Button
        android:id="@+id/bResults"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="80"
        android:text="Try Command" />

    <ToggleButton
        android:id="@+id/tbPassword"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="20"
        android:checked="true"
        android:paddingBottom="10dp"
        android:text="ToggleButton" />
</LinearLayout>

<TextView
    android:id="@+id/tvResults"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:text="invalid" />