Develop Reference

how to center android Textview element at bottom of the screen

I have the android xml layout using DroidDraw :
link : https://docs.google.com/document/d/1L3QJVwI9Znmeu1yANJXhDcZGFR70587d4oznu0hrZCw/edit?usp=sharing0
I need to bottom align the last Textview (Yellow one as indicated in the print screen).
i.e.
I need this :

Try using
android:alignParentBottom="true"
If I see correctly that the parent ViewGroup of your TextView is a RelativeLayout

Set the parent relative layout property to:
android:layout_gravity = "bottom | left"

In Relative layout use:
android:alignParentBottom="true"
and In Linear layout use:
android:layout_weight="1.0"
android:gravity="bottom|right"

This post did the trick.
stackOverflow link
I needed to implement layout_weight on my layouts. Basically defining weights for header, content and footer

Why android:gravity attribute for ImageView is not there?

Does anybody know, why there is no android:gravity attribute for ImageView?
Why only android:layout_gravity is shown by Eclipse?

Does anybody know, why there is no android:gravity attribute for ImageView?
Because the developer of ImageView decided not to create one. Not every attribute is used for every widget. In this case, ImageView instead uses android:scaleType to control how the image fits in the space devoted to the ImageView.

android:gravity is used to set the gravity to the content inside the View, whereas android:layout_gravity sets the gravity of the View relative to its parent.
I think an ImageView does not need android:gravity because it should not have child content.

Button not centering horizontally

I just started Android development and I'm having trouble figuring out why my text alignment inside my button isn't horizontally centered. It is vertically centered.
I've tried gravity, some padding, center, and text alignment center with no luck. I am using a RelativeLayout with an EditText and a TextView above. When I take the other views out of the activity, there is also no change.
I can get it to center with gravity center_vertical and some padding left, but this method seems inappropriate.
Here is a view of the button before update:
Update: Tested on my ADV for android:gravity="center_vertical|center_horizontal" and it ended up working fine. Seems to be a bug with the Graphic Layout view in Eclipse that is mis-aligning the inner context of the Button view. Here's it working on my AVD:

Set the gravity of the button as android:gravity = "center" or android:gravity = "center_vertical|center_horizontal" .

try layout_gravity="center" or gravity="center" instead. I always forget which one : P

android:gravity = "center"
will align the text inside the button both horizontally and vertically.
android:layout_gravity is different from android_gravity.
Refer for a detailed answer:
Gravity and layout_gravity on Android

How to prevent TextView from resizing its container

Take a look at my layout
http://pastebin.com/6tQVm3Rk
My problem is that the textviews (named header1 to 5) are resizing its containers when a certain amount of letters are written into it, although there is still some space left.
What changes do I have to make that the layout stays in its original state independent from the amount of text located in the headers?

This might be because of this attribute.
android:inputType="textMultiLine"
If you want your textview to have only one line you can use android:singleline="true"

Add the attribute
android:maxLength="2"
to the textview. This way you can limit the number of characters.

I think its better to use Relative layout instead Linear layout in the XML so that objects in Relative layout are easy to manage dynamically, all you need to do is that put all those text views in the Relative layout and set these parameters:
layout align left:
layout align right:
And other solution which is not appropriate is that fix the size of text view then it will not expand.
And please see the Documentation for further details of Relative Layout.

Set the width and heigth of your textview to a fixed amount of dp. This will prevent the textview from streching beyond the width and height you declared. Like this:
android:layout_width="50dp"
android:layout_heigth="50dp"

For me the solution was to use
android:layout_width="0dp"
together with
android:maxLines="1"

android:layout_alignParentBottom is ignored when used without explicit layout height as a row in ListView

When I use a RelativeLayout with either fill_parent or wrap_content as height and an element which specifies: android:layout_alignParentBottom="true" it is ignored and it is aligned at the top. Setting the height of the RelativeLayout to an explicit value makes it work. Any clues?

This seems to be a bug in Android itself, see http://code.google.com/p/android/issues/detail?id=1394.
I worked around it by wrapping my RelativeLayout in a FrameLayout and putting my bottom aligned view as a children of the FrameLayout with android:layout_gravity="bottom". This hinders you from referencing it from within the RelativeLayout so you'll have to work around that (for example using margins).
If anyone has a better workaround, please share.

When you inflate the layout, use inflate(R.layout.whatever, parent, false), where parent is the ListView. If you don't do that (e.g., you pass null for the parent), RelativeLayout gets strange in list rows.

My hack for this andriod bug:
ViewGroup.LayoutParams lp=(ViewGroup.LayoutParams)view.getLayoutParams();
lp.height=view.getContentHeight();//hack for android bug about ViewGroup.LayoutParams.WRAP_CONTENT and android:layout_alignParentBottom="true" on landscape orientation
view.requestLayout();
act.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);

I was able to get the proper alignment by specifying the problematic TextView with:
android:id="#+id/must_be_bottom_left"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:layout_below="#id/xxx"
where xxx was the id of a TextView that has android:layout_below="#id/yyy"
and yyy is a TextView that is always above both xxx and must_be_bottom_left.
The contents of my list items can vary so that sometimes the "xxx" TextView is View.GONE, but even then the layout works as expected.
I don't know how fragile or merely seredipidous this work-around is. I am using Android 1.6 and I haven't tested it for forward compatability.