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Replacing a View in Android onClick

I'm still kind of new to android. I'm writing a Tic Tac Toe game as a bit of practice. I'm trying to figure out how to replace views when I click a button. I have 9 buttons in a GridView. When a user clicks one, I want that to change to a non-clickable TextView and back to Button when a user click's the reset Button at the bottom of the screen.. I use a flag to keep track of player's turn so it'll know whether or not place an x or o. Is this even possible or am I stretching here?

You'll soon find that there are really not that many things that are stretching it for Android.
This is certainly possible. For each grid in your GridView, put in two elements - the Button, and the TextView. Change the visibility of each. In other words, you don't actually replace one with the other - you just hide one, and show the other.
So you'd have two items like this:
<Button ... android:visibility="invisible"/>
<TextView ... android:visibility="visibile"/>
And have both of these match_parent, so that they fill each grid and are basically both on top of each other.
To change the visibility in the code:
button1.setVisibility(View.INVISIBLE);
textView1.setVisibility(View.VISIBLE);
I'm trying to give you as little actual code as possible so you play with this and write it yourself, but this should definitely put you in the right direction. Let me know if you need more guidance though.

You can do it two different ways
You can put both a button and a textview in each grid and interchange their visibility when you click on the button. For this, you can set the button and textview properties from the xml layout and you dont have to do much programatically
You can use a button alone and just change the look by changing the background drawable at runtime. Then you can make it unclickable by disabling it or changing its focusable property to false
You can even use an imageview and just change the drawable src and disable it on user click. Android is quite flexible and this is not even a stretch. If you give a little more detail of the specifics you want to achieve, I could advise which solution will be best fit

Android non-rectangular buttons, how to handle this?

I've designed some buttons with photoshop but now it came in my mind the problem on how make them work.
Basically I've this image
I've thought about two solutions: the first one is to place them in a RelativeLayout and place them with "lot" of padding/margin work, the second solution is to cut them vertically and attach them one by one, like this:
In the second solution I cannot probably use selector, not on all the button at least, not a big issue btw. With the first one I'm a bit worried about scaling on different screen sizes.
It will be a problem? Which solution would you suggest?
Thanks in advance.

Its not a must that your clickable area should be the same shape as your image shape..
Change the Image onclick...
If your options are open to use an image view instead of button, Then the whole image will be clickable.
I searched all over to find this question similar to yours.. Hope it helps.

Create a button with custom layout android

Image comments: Icon should go centered in the red bit. The text should go centered in the yellow bit.
I'm trying to create a button in android that looks pretty much like the above. I tried with the imagebutton, the normal button (with drawabletop and drawablebottom), but the text is not proper aligned then.
Do note that I prefer not to use shapes, as the final result will be ninepatch images (that come from photoshop). Although feel free an example there for documentation use.
Also note that it needs to be clickable.
I think i just need to create a custom XML for this below, and then somehow have a button make use of this. I just haven't figured out how/where i need to set the text and so on then.
Any advice on this is appreciated.

hiii....
While using Button... you can align your text as per your expectations using android:gravity="center"android:text="TestHere"`
Try using this... In my case this works f9... It does or doesn't help you plz let me know

You could create the lower part as a separate button, and the above part as an imageview. In your layout file, place the top part above the bottom part. And finally, in your code, create a on clicklistener and assign the same listener to both the button and the image. Of course this would only cause the bottom part to act like a button(looking like it's pressed), but perhaps that's acceptable.

As you want to use Nine patch, create nine patch such a way that the content area is only in the middle of the yellow portion. I'm sure you know how to select content area for nine patch.

Android UI question. Implementation guidance

I'm working on implementing a UI for an Android application, and I wanted to ask if there is already something in the native widgets to accomplish most of what I'm trying to do.
The application that I'm working on performs 15 different tasks that can be divided into 3 different groups. (5 tasks per group) I have 18 icon images (3 for the groups and 15 for the individual tasks) and I want to be able to panel these icons (starting with the groups) like this:
I want the next icon visible below and above (if further down than the first icon) and swipe to go to the next icon
Once an icon is clicked, the panels slide to the side, exposing the next layer (the specific 5 tasks for the selected group) with the selected group still visible on the side:
From there, the user can tell at a glance what group they are in, what the current, next and previous selectable tasks are, and that by swiping right, they can get back to the group selection.
What types of widgets would I need to look into in order to accomplish something like this? Are there already pre-built lists to do these activities?
Thanks for any guidance!

You can get close with a LinearLayout of ImageView widgets and a ScrollView (vertical) or HorizontalScrollView. However, it will not give you the desired "centered image with bits of the previous/next images" effect -- it will be wherever the user positions it.
You can get close with a Gallery. However, it will not give you the vertical orientation, and it will always give you a fixed set of full options to the sides, not the partial images that you seek.
If it's gotta be the way you describe it, you'll have to roll it yourself. Gestures and animations should give you the desired effect.

Have you taken a look at ViewFlipper? http://developer.android.com/reference/android/widget/ViewFlipper.html This will give the side by side effect but you will have to make custom views for each group to populate it with the proper icons.

I'd use a ListActivity for the first 3 top level items. This won't give you the auto centering effect that you'll probably want, but you should be able to look at the Gallery source code, which can be found here, and make some modifications to the ListActivity so that it autocenters.
For the next items, I'd add an onClick and a GestureListener so you can navigate to another activity with another list view. Since you know where you came from (add some data to your Intent) you can set the color rectangle on the left so that it appears that you have just swiped the whole view left.
If you need to customize the animation, you can call this:
overridePendingTransition(R.anim.slide_left_entry, R.anim.slide_left_exit);
To make the yellow icon look good as it animates to the left, I'd change the list bounds (on the first activity) to have no margins, and change the yellow icon to have square right edges - This will make the small yellow rectangle on the next activity appear to be part of the first activity.
It should be relatively easy to mock this up to see if it's going to work properly for you.
Good luck!
EDIT: Ok, so I've made a basic project that does most of what you want.
here is the link to the eclipse project file. I was going to put the source up here, but there's a bit much to display.
What you still have to do:
Tweak animation
Configure the layer lists to display the correct colors
Add information to the top level intent for the sub-activity to be able to configure itself.
Quite a few other small things.
I think I've got the main stuff done. I've also added the gesture listener I talked about, although re-reading your question, you actually didn't ask for that. Since it's cool, I left it in.
Good Luck once again!!

Have you thought of launching Activities with different view configurations? You can switch from one activity to another with a gesture and you can Animate the views. What your UI looks like to me is a bunch of screens with affordances that show the other screens. So one Activity per screen maybe the same in different configurations or something like that.

creating a custom image based layout on android

Is it possible to create a layout based on (background) images? For example, there is well know app called Appie that uses this picture as a homescreen:
I might be able to recreate the layout with a TableLayout, but this will be difficult to get it perfectly aligned with the buttons in the image. The default layout options make it very difficult, or maybe impossible, to allow for selection of the buttons on the image (especially when the buttons are in an arc-path).
Can anyone tell me how this is done?

I had some issues positioning a badge on the corner of a view. You can check my solved question:
Positioning a badge bubble on the left upper side of a button
About how it can be done. I would do it with a RelativeLayout and TableLayout as you mentioned, but to be completely sure, you can use apktool to see how the xml are done but it might be ilegal to do it.