How to give 20 screen width to an ImageView - android

How do I create an UI header like this image?
I'm using the code below but how do I adjust 30% of the screen to the image and 70% to a TextView. I also use two TextViews on that 70% of width. This is my code, it does not look as in the image
<?xml version="1.0" encoding="UTF-8"?><LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#=#EFECE5"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher"
/>
<TextView
android:id="#+id/txtCaption"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#ffffff"
android:text="San Diego Uified"
/>
<TextView
android:id="#+id/txtCaption"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#ffffff"
android:text="School District"
/>
</LinearLayout>
</LinearLayout>


add android:layout_weight="3" property to image and android:layout_weight="7" to text


checkout weight for textviews and imageviews and weightSum for LinearLayout
What is android:weightSum in android, and how does it work?


Try to use "android:layout_weight"
Assigning a value 'android:layout_weight' will split up the available space in the parent View, according to the value of each View‘s layout_weight and its ratio to the overall layout_weight specified in the current layout for this and other View elements.
In your case
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#=#EFECE5"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher"
android:layout_weight="30"
/>
<TextView
android:id="#+id/txtCaption"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#ffffff"
android:text="San Diego Uified"
android:layout_weight="35"
/>
<TextView
android:id="#+id/txtCaption"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#ffffff"
android:text="School District"
android:layout_weight="35"
/>
</LinearLayout>


here you go..
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:background="#000000" android:orientation="vertical" >
<!-- Header Layout -->
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#000000"
android:orientation="horizontal"
android:weightSum="1.0" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#000000"
android:orientation="horizontal"
android:weightSum="0.30" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
android:orientation="horizontal"
android:weightSum="1.0" >
<TextView
android:id="#+id/txtCaption"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:textColor="#ffffff"
android:gravity="center"
android:text="San Diego Uified"
android:layout_weight="0.50"
/>
<TextView
android:id="#+id/txtCaption"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:textColor="#ffffff"
android:gravity="center"
android:text="School District"
android:layout_weight="0.50"
/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
<!-- Body layout -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
android:orientation="horizontal"
android:layout_weight="0.70"
android:weightSum="1.0" >
<TextView
android:id="#+id/txtCaption"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:textColor="#ffffff"
android:gravity="center"
android:text="School aasdadadad adasd"
android:layout_weight="0.50"
/>
</LinearLayout>

Related

ImageView in LinearLayout give a fixed width in percent

I'm using a ListView, for each item I created an imageview + an edittext. I load images from a website and I don't understand why some images have not a width of 35%. However I use the layout_weight property. Can you tell me how to force the image to take 35% of the width ?
For example, the result i have now :
And here is my code :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:weightSum="3"
>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="0.3"
android:orientation="horizontal"
android:padding="5dp" >
<ImageView
android:id="#+id/poster"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="6dip"
android:layout_weight="0.35"
android:contentDescription="42"
android:src="#drawable/ic_launcher" />
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.65"
android:text="Title"
/>
</LinearLayout>
</LinearLayout>
If you see what is wrong :/
Best regards,
Zed13
Edit : The result with Rishi Paul solution
And the updated xml :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:weightSum="3"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="5dp" >
<ImageView
android:id="#+id/poster"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginRight="6dip"
android:layout_weight="0.35"
android:scaleType="fitCenter"
android:contentDescription="42"
android:src="#drawable/ic_launcher" />
<TextView
android:id="#+id/title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.65"
android:text="Title"
/>
</LinearLayout>
</LinearLayout>

Do Like This. It Will Help You
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="5dp"
android:orientation="horizontal" >
<ImageView
android:id="#+id/poster"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginRight="6dip"
android:layout_weight="0.35"
android:adjustViewBounds="true"
android:contentDescription="42"
android:src="#drawable/desert" />
<TextView
android:id="#+id/title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="0.65"
android:text="Title" />
</LinearLayout>

How I can put "Imagenview" under all the elements?

Hi, I commented that I have this layout and if you can see there is a line on the right which should go below the text
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/layout_promocion_item0"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#363636"
android:padding="10dip" >
<LinearLayout
android:id="#+id/contenido"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<LinearLayout
android:id="#+id/contenido_Nombre"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".75"
android:orientation="horizontal"
>
<TextView
android:id="#+id/nombre_promo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Vodka + Nectar"
android:textColor="#ffffff"
android:textSize="25sp"
android:tag="bold" />
</LinearLayout>
<LinearLayout
android:id="#+id/contenido_precio"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".25"
android:orientation="horizontal" >
<ImageView
android:id="#+id/separador_lateral"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:src="#drawable/vertical"
android:layout_gravity="left"/>
<TextView
android:id="#+id/precio"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="$2200"
android:textColor="#ffffff"
android:textSize="24dp"
/>
</LinearLayout>
<ImageView
android:id="#+id/separador"
android:layout_width="0dp"
android:layout_height="19dp"
android:layout_weight=".50"
android:src="#drawable/divierblanco"
android:layout_alignParentLeft="true"/>
</LinearLayout>
</LinearLayout>
.. so is something like:
NAME: PRICE
I can not locate the image below the text .... Can you help me?

You have way too many nested LinearLayouts, IMHO, which can be bad for performance and decrease readability. I would use a RelativeLayout and 1 nested LinearLayout
<RelativeLayout
...>
<LinearLayout
android:id="#+id/someId"
....
<TextView
...>
<ImageView
...>
<TextView
...>
</LinearLayout>
<ImageView
android:layout_below="id/someId"
...>
Something like this should work.
Alternatively if this doesn't work for you, then placing that ImageVIew outside of the first child LinearLayout should also work
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/layout_promocion_item0"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#363636"
android:padding="10dip" >
<LinearLayout
android:id="#+id/contenido"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<LinearLayout
android:id="#+id/contenido_Nombre"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".75"
android:orientation="horizontal" >
<TextView
android:id="#+id/nombre_promo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Vodka + Nectar"
android:textColor="#ffffff"
android:textSize="25sp"
android:tag="bold" />
</LinearLayout>
<LinearLayout
android:id="#+id/contenido_precio"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".25"
android:orientation="horizontal" >
<ImageView
android:id="#+id/separador_lateral"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:src="#drawable/vertical"
android:layout_gravity="left"/>
<TextView
android:id="#+id/precio"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="$2200"
android:textColor="#ffffff"
android:textSize="24dp" />
</LinearLayout>
</LinearLayout>
<ImageView
android:id="#+id/separador"
android:layout_width="0dp"
android:layout_height="19dp"
android:layout_weight=".50"
android:src="#drawable/divierblanco"
android:layout_alignParentLeft="true"/> // this doesn't do anything in a LinearLayout
</LinearLayout>

Your imageView (with the id separador) is inside a linearLayout with an orientation set to "horizontal". Move the imageView to the outermost linearlayout like so:
EDIT: The xml that's displayed below is completely different than what I typed in my answer. What's up with that? Regardless, move the imageView down an element.
<LinearLayout
android:id="#+id/contenido"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<LinearLayout
android:id="#+id/contenido_Nombre"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".75"
android:orientation="horizontal" >
<TextView
android:id="#+id/nombre_promo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:tag="bold"
android:text="Vodka + Nectar"
android:textColor="#ffffff"
android:textSize="25sp" />
</LinearLayout>
<LinearLayout
android:id="#+id/contenido_precio"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".25"
android:orientation="horizontal" >
<ImageView
android:id="#+id/separador_lateral"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_gravity="left"
android:src="#drawable/vertical" />
<TextView
android:id="#+id/precio"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="$2200"
android:textColor="#ffffff"
android:textSize="24dp" />
</LinearLayout>
</LinearLayout>
<ImageView
android:id="#+id/separador"
android:layout_width="0dp"
android:layout_height="19dp"
android:layout_alignParentLeft="true"
android:layout_weight=".50"
android:src="#drawable/divierblanco" /></LinearLayout>

Why does the imageview disappear on the layout?

The imageview is on the right of the layout. It doesn't display if the content of messagedetail_row_text is too long. The imageview does display if the content of messagedetail_row_text is not too long.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:gravity="right"
android:orientation="horizontal" >
<LinearLayout
android:id="#+id/dfdwasdfds"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/outgoing"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="22dip"
android:orientation="horizontal" >
<TextView
android:id="#+id/messagedetail_row_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="1dp"
android:textColor="#000000"
android:textSize="18sp" />
<TextView
android:id="#+id/messagedetail_row_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dip"
android:paddingTop="1dp"
android:textColor="#000000"
android:textSize="16sp" />
</LinearLayout>
<TextView
android:id="#+id/messagedetail_row_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingLeft="2dp"
android:textColor="#000000"
android:textSize="20sp" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_toRightOf="#id/dfdwasdfds"
>
<ImageView
android:id="#+id/messagegedetail_rov_icon2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:gravity="right"
android:src="#drawable/retouxiang" />
</LinearLayout>
</RelativeLayout>

It is not clear what you are looking for exactly. This is from what I understand:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:gravity="right"
android:orientation="horizontal" >
<LinearLayout
android:id="#+id/xyz"
android:layout_alignParentRight="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<ImageView
android:id="#+id/messagegedetail_rov_icon2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:gravity="right"
android:src="#drawable/retouxiang" />
</LinearLayout>
<LinearLayout
android:id="#+id/dfdwasdfds"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="#+id/xyz"
android:background="#drawable/outgoing"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="22dip"
android:orientation="horizontal" >
<TextView
android:id="#+id/messagedetail_row_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="1dp"
android:textColor="#000000"
android:text="messagedetail_row_name"
android:textSize="18sp" />
<TextView
android:id="#+id/messagedetail_row_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dip"
android:paddingTop="1dp"
android:text="messagedetail_row_date"
android:textColor="#000000"
android:textSize="16sp" />
</LinearLayout>
<TextView
android:id="#+id/messagedetail_row_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingLeft="2dp"
android:text="messagedetail_row_text and this is a long text"
android:textColor="#000000"
android:textSize="20sp" />
</LinearLayout>
</RelativeLayout>

Try to change
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_toRightOf="#id/dfdwasdfds"
>
to
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_below="#id/dfdwasdfds"
>

I think it is happening because you have given your textView width fill_parent and it takes up as much space is its length is, then its parent width is wrap_content, so it goes upto its child occupies space(i.e TextView), so you dont have space to display the ImageView.
You can try using LinearLayout as root layout instead of relativeLayout..and manage your views by giving them weights..

Android - ImageView and TextView not appearing

I want to display an ImageView then her TextView details followed by an other ImageView and her TextView details and then a text view and under them an ImageView then her TextView. So i put 2 child LinearLayouts that has orientation set to horizontal and the parent with orientation vertical but the second child LinearLayout is not appearing at all I don't know why. Thank you for helping. This is my activity.xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/fondgris"
android:orientation="horizontal" >
<LinearLayout
android:id="#+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:id="#+id/linearLayout2"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imageTypeWorkitem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight="15dp"
android:paddingTop="10dp"
android:src="#drawable/bugicon" />
<TextView
android:id="#+id/typeWorkitem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="14sp"
android:textStyle="bold" />
<ImageView
android:id="#+id/imagePriority"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight="15dp"
android:paddingTop="10dp"
android:src="#drawable/priorityhigh" />
<TextView
android:id="#+id/priority"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="14sp"
android:textStyle="bold" />
<TextView
android:id="#+id/key"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="14sp"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:id="#+id/linearLayout3"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imageStatus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight="15dp"
android:paddingTop="10dp"
android:src="#drawable/statusopen" />
<TextView
android:id="#+id/status"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/priority"
android:textSize="14sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
</LinearLayout>

Your linearLayout1 has the property android:orientation="vertical" but then the very first child (linearLayout2) has android:layout_height="match_parent", which means the second child (linearLayout3) will have no space since first one will take over full height of the parent.
So you can change both children to have android:layout_height="wrap_content" and maybe add android:layout_weight="1" for both if you want.

The content is larger than the screen and it is hidden. You must use ScrollView.
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewPort="true" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/fondgris"
android:orientation="horizontal" >
<LinearLayout
android:id="#+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:id="#+id/linearLayout2"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imageTypeWorkitem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight="15dp"
android:paddingTop="10dp"
android:src="#drawable/bugicon" />
<TextView
android:id="#+id/typeWorkitem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="14sp"
android:textStyle="bold" />
<ImageView
android:id="#+id/imagePriority"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight="15dp"
android:paddingTop="10dp"
android:src="#drawable/priorityhigh" />
<TextView
android:id="#+id/priority"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="14sp"
android:textStyle="bold" />
<TextView
android:id="#+id/key"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="14sp"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:id="#+id/linearLayout3"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imageStatus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight="15dp"
android:paddingTop="10dp"
android:src="#drawable/statusopen" />
<TextView
android:id="#+id/status"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/priority"
android:textSize="14sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</ScrollView>

Not sure if I'm understanding this correctly but from what you describe I would try using a relative layout as your parent and creating linear layouts inside of that that are relative to each other (one on top of the other).

Positioning ImageView

I need to positioning the ImageView at the same level of the user's name (vito in the example).
This is what I have:
And I want this (look at the second icon):
My xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:paddingBottom="5px"
android:paddingTop="5px"
android:paddingLeft="5px"
android:orientation="horizontal"
style="#style/ListRow">
<ImageView
android:id="#+id/imagenItem"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_marginRight="6dip"
android:layout_gravity="top"
android:gravity="top"
android:layout_alignParentTop="true"
style="#style/iconLISTA" />
<LinearLayout
android:orientation="vertical"
android:layout_width="0dip"
android:layout_weight="1"
android:layout_height="fill_parent">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="#+id/idUsuario"
android:textSize="#dimen/font_size_small"
android:textStyle="bold"
android:textColor="#color/list_item_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"/>
<TextView
android:id="#+id/hora"
android:textSize="#dimen/font_size_small"
android:textStyle="bold"
android:textColor="#color/list_item_secondary_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="215px" />
</RelativeLayout>
<TextView
android:id="#+id/comentarios"
android:textSize="#dimen/font_size_small"
android:color="#color/list_item_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="0px" />
</LinearLayout>
</LinearLayout>
Thanks.

Change the ImageView and following LinearLayout hight attributes to both be wrap_content.
The ImageView is currently fill_parent which is making it take all available vertical space and centering it vertically.

Add:
android:scaleType="fitStart"
to the ImageView layout.
e.g.
<ImageView
android:id="#+id/imagenItem"
android:scaleType="fitStart"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_marginRight="6dip"
android:layout_gravity="top"
android:gravity="top"
android:layout_alignParentTop="true"
style="#style/iconLISTA" />

Try this, is bit simplified:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="5dp" >
<ImageView
android:id="#+id/imagenItem"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_gravity="top"
android:scaleType="fitCenter"
android:src="#drawable/avatar_default" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="#+id/idUsuario"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="left"
android:text="usuario"
android:textStyle="bold" />
<TextView
android:id="#+id/hora"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="right"
android:text="hora"
android:textStyle="bold" />
</LinearLayout>
<TextView
android:id="#+id/comentarios"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="commmmment" />
</LinearLayout>
</LinearLayout>
And you shouldn't use px, use always dp/dip.

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