Android :: Putting Views On Top Of Other View
Feb 9, 2010
I'm still trying to figure out how best to layer views on top of other views. I want to do something like the ZoomButtons on top of a custom view. I tried getting the ZoomButtonsController's parent and then adding views, but I didn't have enough control and they ended up on top of the buttons. I've gotten close by using a FrameLayout and some gravity on the top two views. But this has some interesting effects. Since this is contained with a tab, these two top views appear on top of all four of the tab pages. I want them on top of one of those pages only. Apparently, nested FrameLayouts don't mix well. What is the proper and expected way to do this? Here is more or less my complete layout....................
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Jan 6, 2010
I have a simple ListView and on that ListView I have placed a number of custom defined Views. The CustomView has ImageView and two TextViews.
The CustomView also has a "stateful drawable" as background, so that the background image (a 9-patch) changes if you press the Row in the ListView. When pressing the Row, the background image changes to a Red-ish thing.
The problem is that when the background changes from the default greyish, all the Views in the CustomView (ImageView and TextViews) still have their greyish background and thus creates very ugly greay boxes on top of the now redish background.
What is the best way to solve that problem? I hoped that such things were handled automatically (as it is done in for example .NET), but I was wrong it seems.
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Oct 9, 2010
Is there a possibility to add a view or derivative (button, textview, imageview etc...) to another view without having to go through layouts?
I have a class called ScreenView, it derives from View (e.g. public class ScreenView extends View).
I wanted to display text into it, labels, images etc..
On an iPhone it's trivial, simply create my objects and use addSubview method ; you can embed any UI objects into another. Most UI toolkits work that way too.
Problem with layouts is that I haven't found an easy way to properly position a subview (say a text view) in a given location of the enclosing View. I want one to contain the other...
I was hoping I had missed something in the documentation (which is far from being intuitive that's for sure) and I could do something like myView.addView(subview). But it ain't so :)
As a side question, what is the closest to iPhone's UILabel in the Android world?
A UILabel can contain a text or a graphic. Right now I've been using TextView and ImageView but they aren't anywhere as flexible when it comes to layout as a UILabel
Edit: Making my View inherit from ViewGoup instead, let me add subview..
However, I want to draw in my view. I found that when ScreenView extends ViewGroup, the onDraw function is never called then.
Something like:
CODE:..........
Would paint in yellow my view if ScreenView extends View ; but not if it extends ViewGroup.
How do you draw directly in the view then?
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Mar 25, 2010
The reason for me to do this, I have created these 2 views in the beginning of the app. SO they are always present. But in some cases where i want only 1 view(which is surfaceview) and if i dont need the 2nd view(i.e, videoview), i am still getting a black patch at the palce where i have defned a videoview. want to get rid of this. Can anyone please tell me if it is possible to disable views/surfaces corresponding to them? If so how can we do this?
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Oct 23, 2010
I am trying to figure out how to add a child view to a parent view so I can use the MotionEvent.ACTION_MOVE feature to move from one child view to the next. Is this possible?
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Nov 11, 2010
I have an List Activity with a Base Adapter where the contents have changed (example - the rows are reordered). I have tried invalidate.
Code...
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Apr 19, 2009
Is it possible to add a view dynamically that overlaps other views in the layout. I have Linear Layout defined for the activity. As part of the Layout I have a custom View. The content changes dynamically and sizes appropriately based on the content size, with fill_parent for width and wrap_content for height. But what I want is, dynamically take over the full screen and then based on a click go back to the normal mode. Is there a mode to display a view where - in it can overlap all other views in the layout?
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May 14, 2009
Is it possible to clone a view. If no, how to support clone of a view in custom views. If yes.. which api should we use. clone method seems to be protected for view.
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Mar 11, 2010
I am developing a small app for Android. I am creating my own view.
I am planning to design the layout to be:
<LinearLayout>
<MyView>
<Button><Button>
</LinearLayout>
But when I run my program, my custom view will cover the whole screen. Is there anyway to avoid this?
I have already tried to add android:layout_width, layout_height to be wrap_content, fill_partent, but no luck.
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Feb 12, 2009
I'm looking for a way to iterate a viewgroup to retrieve all child views without calling findViewById(). Does view count and view position line up? So can I get the view count and then use that as a counter to call getChildAt(int index)?
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Oct 18, 2010
I was wondering if there is a way for placing a view to the right side of another view and centering it vertically on the second views height. In know this can be done using a LinearLayout, but for other reasons the 2 views must be part of the same RelativeLayout.
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Mar 18, 2009
I have table with 3 columns which is binded to an XML document with three text views.
CODE:........
Depending on the value store in the third column, I want to change the text color in R.id.c. How should, I go about with this.
This is what I have so far :
COD:...............
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Nov 16, 2010
I am implementing a music player application in Android. My play list selection screen is implemented as a tab selector widget which contains a ListActivity inside each of the tabs: Artist, Albums, Songs.
I want to update the ListView in each of the ListActivity when I delete an item from any of the lists.
i.e. When I long press an item in the Artists list a context menu is drawn with "Delete Artist"
And it should delete all the songs from this artist in the Songs ListView, delete all the albums by this artist in the Albums ListView, and finally delete the entry for the artist in the Artist ListView.
Each of the ListActivity has its own fillData() method, which updates the ListView when the button in the context menu is pressed.
How can I call the fillData() method of the Albums ListActivity after I update the ListView inside of the Artists ListActivity?
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Feb 28, 2010
I want to populate a table, defined in layout xml file through the programmatic way. I have define Table with a single row defining its header, with all the attributes set. Now i want to know a way so that i can just replicate that header row in the table with new content.
I tried using inflator inflate(int,view) method, but at runtime it showed up with error.
Here is the XML code for the layout file defining the table
CODE:.................
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Dec 23, 2009
What's the functional difference between these list view methods: invalidate() and invalidate Views() ? Which one is faster to refresh a list view?
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Mar 6, 2010
I have the following XML code:.................
The idea is to change the views, whenever I press one of the radio buttons. When I press a button the first time everything works out fine, but the second time I press a button, I get an IllegalStateException, and I can't quite see why I'm getting this.
Also, the Activity seems to set all my global variables to null, which is why I have to create them every time I switch from portrait to landscape or vice versa. So I would like to know if there is a way I can save my views in the Bundle, or any other way in which I can permanently save my views, so I don't have to add or create them every time, I flip the phone. And whenever I flip the phone, it seems that it rereads the main XML file, causing the RadioGroup to be set to 2D even if the 3D button is checked. This is because I've said the 2D button to be checked from when the app is first created, but I would like to also save the state of that RadioGroup.
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Jun 16, 2010
How do you align views relative to the "middle" part of another view? I think it is best explained with a pic of the UI I'm trying to create in android.
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Jan 25, 2010
Is there any way to query a root view of an activity for all of its child views even before the root view or its children have been inflated? I guess what I'm looking for is whether a view knows ahead of time what children it will have before it gets inflated, and can I get that list in some way. Bizarre I realize, but I think it will help me with some unconventional automation testing I'm working on. I haven't found anything in the API like this.
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Mar 7, 2010
Let's say I have a LinearLayout, and I want to add a View to it, in my program from the Java code. What method is used for this? I'm not asking how it's done in XML, which I do know, but rather, how can I do something along the lines of (One View).add(Another View) Like one can do in Swing.
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Dec 30, 2009
I'd like to send an sms message. If the text is too long, I split it into multiple messages. I'm trying to put some extra info into the "sent" intent to know which part has been sent, and when all the parts are complete: The message is sent, and I catch the intent when each part is sent - but the intent always has the same data in it. For example, "partIndex" is always zero, even though for the second message, it should be one. Seems like the same intent just keeps getting thrown to my broadcast receiver. What's the right way to do this?
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Jan 29, 2009
I have gotten through signing up as an Android developer, joined Android Market, and recieved and activated my Android Developer Phone.I have my first draft application running in the emulator.The documentation suggests testing it throughly on the device, however, I don't want to put it up publicly in the Android Market until I am satisfied with the app.
1) Is there a way to privately post a testing app on Android Market? If so, would somebody please point this newbie to the HOW-TO?
2) Is there a way to push my app onto my developer phone without using Android Market? If so, would somebody please point this newbie to the HOW-TO?
I'm having more fun working with this Android stuff than I have had in years! As soon as I learn enough to contribute I'm going to be overjoyed to share it.
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May 4, 2010
I have a bunch of objects that implement Serializable that I want to store in a SQL database.
I have two questions:
Is there a way to serialize the object directly into the database. Is that the best way to do it or should I Write the object out to a formatting String and put it in the database that way and then parse it back out
Write each member to the database with a field that is unique to each object.
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Aug 16, 2010
Is it possible to draw a border around a textview?
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Aug 25, 2010
I'm trying to create a form like dialog to accept a few EditText and a spinner. Somehow I can display the spinner but then I start implementing the array and setOnItemSelectedListener it crash. Did I do anything wrong?
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View layout = inflater.inflate(R.layout.generate_pwd, (ViewGroup) findViewById(R.id.generate_pwd));
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
Spinner spin=(Spinner)findViewById(R.id.spinner);
spin.setOnItemSelectedListener(this);
ArrayAdapter<String> pwdTypeArray = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, R.array.password_type);
pwdTypeArray.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spin.setAdapter(pwdTypeArray); builder.setView(layout);
// Now configure the AlertDialog builder.setTitle(R.string.generate_pwd_title);
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Apr 13, 2010
I'm trying to pass an object from an activity to another activity. In the first activity i do:
Intent intent = new Intent(this, SecondsActivity.class); intent.putExtra("package.class", SerializableObject);
And in the second activity:
Class object = (Class) extras.getSerializable("package.class"); objetc.modifySomething(2432);
Intent intent = new Intent(this, ThirdActivity.class); intent.putExtra("package.class", SerializableObject);
But if i modify the object in the second activity, it fails when i send this object to a third activity.Why does it fail? What am i doing wrong? I just need to pass objects between diferent activities because i have an object which contains many information, and creating a Boundle would be very big and ugly in my code.
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Jun 21, 2010
When I add a new contact to my phone it doesn't show up in the contacts list. When I dial the number manually it shows the name of the person I am calling or that I added. Where is it putting my new contacts? Is there a group setting somewhere I missed?
I also noticed that all my numbers that were brought over from my old phone are listed twice when I go to edit a contact. They are only listed once when I look up a contact but under edit there are two screens with the same info.
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Aug 2, 2010
I am trying to set up a ViewFlipper that changes a SlidingDrawers content each time a button is pressed. So far every view I set up worked fine, but now I am trying to create a ListView (including single_choice_mode) within a child view of the ViewFlipper, but my attempt only let to a NullPointerException. As I only discovered ViewFlipper today, I am not yet familiar with it and may not have understood it completely. if someone could give me a hand and help me find out what I have done wrong, that would be great. Here is what I have done:
The code for the onClick event of the ImageButtons:
public void onClick(View v){
if (v == btnExposure){
mFlipper.setDisplayedChild(0); }
else if (v == btnProperties){
mFlipper.setDisplayedChild(1);}
else if (v == btnSpecialEffects){
mFlipper.setDisplayedChild(2);.............
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Nov 24, 2010
We are planning on this strategy to distribute our application to clients. We would like to get your your thoughts, if you have done something similar, in terms of whether we are missing something. We have tested this approach and it works.We want to distribute our application to our clients without putting it on the market as we do not want every one to download it. We want our clients to be able to easily get future upgrades to the application. Here is how we are planning to do this:
1. export the apk file using the Eclipse wizard.
2. put this apk file on a website. The user will be able to go to this website on the browser on the phone and install the 1st version of the app.
3. next versions of the app will have an incremented android:versionCode, and android:versionName in the manifest. A button in the settings will point to a link which will have the next version of the app. So to upgrade the user will click on this settings button and download the next version and click on the apk file to replace the old version.All subsequent versions of the app will be signed by the same certificate using the export wizard in Eclipse
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May 23, 2009
My app seldom needs to put the device (or screen) to sleep. That is - programmatically imitate user pressing on red stop-call button. According to docs PowerManager.goToSleep() does just that, but requires android.permission.DEVICE_POWER, which is never granted to apps!
(A) What on earth should I do to get this working?
(B) How can I programmatically wake up the device.
just to clarify - I'm not interested in a wake lock solution.
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Jan 24, 2009
I have a layout file with 6 image buttons.Each button should show different source image based selection/focus/noselection.I am able to do this with 6 xml files under drawable folder with selector/item nodes.Is there a way to put all these selectior nodes in ONE xml file to accomplish the same.Less files means less management.
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