Android :: Adding Multiple ImageViews To A Layout
Aug 31, 2010
I need to load several ImageViews into a layout. The ImageViews are used to show a rating using 'star' icons. The number of stars (i.e. the rating is determined during loading by reading a configuration file.
The ImageViews are sitting inside a RelativeLayout layout.
Currently I am using something like this:
CODE:........
My quesions are:
1) Is doing the loading dynamically (not using an xml) is the 'right' way of doing this ?
2) If it is, how do I make the stars display in a line, currently they get placed one on top of the other.
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Jun 21, 2010
I thought I have understood the XML layout of Android, but it seems that I haven't. I want to have four ImageViews on one screen, to view four images at the same time.
It should look like this, where A to D represents the image views:
DDDAAA
DDDAAA
BBBCCC
BBBCCC
How can I do that? I tried it this way, but it's not working. The Eclipse Editor seems not to be very good for this either. Is there a better one to create those layouts?
CODE:.................................
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Sep 28, 2010
I would like to design a layout for my android app which has imageviews/Textviews placed as shown in the figure below.
Right now, i tried to use Absolute layout, but i know that will create problems as the screen size changes.
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Nov 8, 2010
I'm just starting to get the hang of animations, tweened animations that is. I have made several imageviews with pictures rotating and moving, and its all very fun, but I don't know what the best approach for doing multiple animations is.
For example I created a LinearLayout and stuck some ImageViews in it and wrote this:
CODE:...............
for each imageview. So they all spin. But now I want to step it up a gear. But reaidng other sources on the net it seems some people use canvas to do animations. What is the best way?
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May 6, 2010
I have an Activity which uses a layout with a LinearLayout in it. Now I want to create in runtime a subactivity which loads some other layout and add this layout as item of my LinearLatout.
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Nov 10, 2009
I have write a a.apk already, and there are a button in the a.apk that can trigger for b.apk, however b.apk is a freeware apk downloaded from the internet, now, I want to add a layout in the b.apk, such as left side is b.apk main program region, and right side is my new add layout region for a button, this button in the new layout region that can let users back to a.apk when click on.
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Mar 9, 2010
I am developing under eclipse.When I add a new .xml file under a layout and build my application,the resources are not generated for that file under R.java consequently the new layout is not recognized.How do I fix this.
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Jan 26, 2009
I am probably missing something totally obvious, but can someone tell me how to add padding between buttons of a Linear Layout?
Code...
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Sep 15, 2010
I was looking over this code about extending an ImageView: http://marakana.com/forums/android/examples/98.html
And i was wondering how can i add the new View to an existing xml layout file, along with some other views.
Already i did this inside my main linear layout:
CODE:..........
But the problem is that this way the onDraw method doesn't get called.
Maybe some examples where you combine CustomViews with xml layout.
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Aug 18, 2010
I have a custom view (an extension of a TextView) that I want to dynamically add to my Layout (don't want to include it in the main.xml file).
The book says to fetch the RelativeLayout using findViewById() in my java code then create a new instance of my custom view, then use addView on the RelativeLayout to add the new view.
I'm not getting any errors, but when I click my button to add the new view, nothing is happening (view isn't being added). Do I need to set additional properties on my custom view (layout width, layout height for example) in order for it to be shown?
Adding code
CODE:............
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Sep 12, 2009
I have a LinearLayout defined in XML that I want to use repeatedly to display elements of a list. The XML-layout looks like this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/background"
android:paddingBottom="5px">
<TextView
android:id="@+id/destination"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="22dp"
android:text="@string/test_destination"
android:paddingLeft="5px"/>
<TextView
android:id="@+id/date"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="15dp"
android:text="@string/test_date"
android:paddingLeft="5px"/>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/info"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingLeft="5px"
android:paddingTop="10px" >
I gather information about certain events from a webpage, and then I want to display all events in a list using the above layout for each event. My current approach is to have a LinearLayout as parent and then adding each event as a row.
Problem number one is to add the layout to each event (the number of events is varying). I.e., I want to dynamically inflate this layout for each event. I also don't want the text to be hard coded into the layout (as above) but added at runtime. I don't know how to do this. I have tried something like the following without any success.
LinearLayout eventView = (LinearLayout) findViewById(R.layout.event);
parentView.addView(eventView);
Problem number two is then to add these layouts to the parent view group and display it on the screen. When I try to do this using parent.addView(child), the program crashes at runtime and I can't figure out why.
It's kind of hard to describe the specific problem, since I'm new to GUI-programming on Android and I'm sort of programming by trial and error right now. Anyway, if you are able to help me with some of the problems it would be greatly appreciated. Linus
EDIT:
The problem now is adding text dynamically to the TextViews. I try this:
TextView dest = (TextView) findViewById(R.id.destination);dest.setText("myText");
only to discover that dest is null. Any ideas why and how to fix this?
EDIT 2:
I have narrowed the problem even more, but I really don't understand its nature. This is the trouble-method: Code...
it somehow works (even though the events are displayed in reverse order). Anyone knows what's going on here?
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Jun 5, 2010
I'm very new to Android programming, so this is probably something pretty basic. I just have an xml layout with a few buttons. I'm trying to follow the model given by the JetBoy demo, so I'm adding a view to the layout which extends SurfaceView. When this new view is put in my xml layout, I just get a blank screen.
Here's the XML layout if it helps. The gameview element is what causes the screen to be blank
CODE:......................
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Jun 10, 2010
I need your help. Coming over from WebOS where I able to add multiple email addresses by simply inputting the user name and password. How do I add my email accounts in Android or is it possible?
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Mar 17, 2010
I'm trying to build a layout where some shapes will popup every 2 seconds. If the user will click one of these shapes, they have to disappear.
What is the correct way of doing this? I thought about a thread, but i missed out.
Here's my code at the moment (is not working):
CODE:..................
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Aug 11, 2010
I want to create a multiple line editview to enter in some notes. I want the text aligned top left and 4 rows. How do I create that in layout xml file. Assume I am using a linearview.
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Jun 20, 2009
Is there a way to do a linear layout with multiple lines? I want to lay out a variable set of buttons with variable labels, so I'd like to use a layout that works as a simple horizontal LinearLayout, but with multiple lines, so the buttons spill into a second (or third) line if they don't fit on the first one.
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Jul 30, 2009
I want to have more than one expandable list within a layout. It appears that an expandable list in a custom layout must have an id of "@id/android:list". So, how could I have more than one if they would need to have the same id?
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Nov 17, 2010
I want to display text such that it would be like:
TITLE 1.1
text about title 1.1
TITLE 1.2
text about title 1.2
TITLE 2.1
text about title 2.1
And so on
It would be a scrolling windows, but another problem is text could be lengthy and could span multiple lines. What do you recommend i should breakup my layout with. The length will be more then the screen height so i need scrollbars. Plus need to keep title bold.
Basically i would be printing this text from a String Array. Is it possible to display it directly from arrays or i can also work with simple strings but need to know how should i breakup my layout. like scrollview -> table layout or what?
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Jul 17, 2010
I use Gmail for my email, but I find the Email app is easier to use. There is also a Messaging app, but that incorporates texting, etc. I don't want that. I just can't figure out how to add multiple email accounts under the Email app. Under email settings I see where it says default mail account and it shows both of my account, but the front screen doesn't show both accounts?
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Jan 12, 2010
I've been attempting to use the <include> tag in some layouts and it seems that these are of limited use because of the flat namespace of the R.id.x approach.
Suppose I have a layout (attribs and xml namespace decl omitted for clarity).
CODE:.......
Now in my java code I have a conundrum. I am not able to identify each individual instance o f the children included layouts root view. In the include tags I can replace the root id with "row1" and "row2" so I can find the individual linear layouts using findViewById
eg:
CODE:.........
However, I can't easily access the two instances of the TextView which are children of row1 and row2 because all I have to play with is the single id "text"
ie:
CODE:..........
In this case, which instance (row1.text or row2.text) does this refer to, both of them, or none?
I guess I would need to use another means of accessing the children of row1 and row2.
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Jun 3, 2013
Is there any free music player app right now that can do that? I have tried all sort of music players such as google music, winamp, etc but all players requires me to manually press and hold each mp3 file to add to a playlist. Is there any app that allows us to choose all the files we want and subsequently add to playlist??
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Nov 11, 2010
I am trying to develop an application for which I want multiple screen support. I have read the Android article on Best practices for Multiple Screen Support. As per the article we have to follow 3 important things
1. Mention support for different screen sizes(large, medium and small) and any density in AndroidManifest.xml.
2. Place images of 3 dpi's (120, 160, 240) in 3 folders res/ldpi, res/mdpi and res/hdpi.
3. In layout's the dimension should be mentioned in "dip" units. Then Android will take care of the scaling on its own.
I have implemented all these points in my project. The images are picked up correctly from the appropriate folders. But the arrangements of the controls in not same.
e.g. I ran the app on three emulators
1. Resolution 240*320 dpi 120.
2. Resolution 240*320 dpi 160.
3. Resolution 240*320 dpi 240.
(All the emulator have same resolution but different density.)
The problem is the position of the controls is not same on all the three emulator. As per my understanding if the android:layout_marginLeft and android:layout_marginTop are mentioned in "dip" then this problem should not occur. As the density of the emulator increases the controls get placed more towards the right. Is it absolutely necessary that I provide layouts for all combination's of screen dimension and density even if the layout is same for all the devices?
Images:
https://docs.google.com/leaf?id=0By3GYC3k5AMDNzUwNjkwMWEtOGQzZC00MjQ0LWE2OTgtYjFhYzZmM2ExOGVl&hl=en&authkey=CLOEsZsI
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Nov 11, 2010
I am trying to develop an app for which I want multiple screen support. I have read the Android article on Best practices for Multiple Screen Support. As per the article we have to follow 3 important things:
1. Mention support for different screen sizes (large, medium and small) and any density in AndroidManifest.xml.
2. Place images of 3 dpi's (120, 160, 240) in 3 folders res/ldpi, res/ mdpi and res/hdpi.
3. In layout's the dimension should be mentioned in "dip" units. Then Android will take care of the scaling on its own.
I have implemented all these points in my project. The images are picked up correctly from the appropriate folders. But the arrangements of the controls in not same. e.g. I ran the app on three emulators 1. Resolution 240*320 dpi 120. 2. Resolution 240*320 dpi 160. 3. Resolution 240*320 dpi 240. (All the emulator have same resolution but different density). The problem is the position of the controls is not same on all the three emulator. As per my understanding if the android:layout_marginLeft and android:layout_marginTop are mentioned in "dip" then this problem should not occur. As the density of the emulator increases the controls get placed more towards the right. Is it necessary that I provide layouts for all combinations of dimensions and density i.e. in layout-small, layout-large, layout- medium, layout-long,layout-notlong?
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Jan 19, 2010
I am currently trying to make my app compliant with all screen sizes / api levels. I have this mostly working, however there is 1 issue i cannot resolve: Layouts in the "layout-hdpi" folder are used by and any phone on 1.5 (API level 3). - Which i dont want, i want API level 3 phones to use the "layout" folder. So to resolve this I added "-v4" onto the folder also, this works, the folder is no longer used by 1.5 phones. However, now the folder is also not used on API Level 6 phones, for example the droid. The droid only picks up the folder if i name the folder: "layout-hdpi-v6". (Also if i put "-v3" on a folder, the layout folder is not used by API level 4 phones) My understanding is that the -v<api level> qualifer allows you to exclude phones on an API level that is too low, so -v4 should mean that the folder will be used by all phones on API level 4 and above. I am finding a folder is only used for that specific API level. Has anybody else ran into this same issue? And does anybody know of any possible solutions?
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Oct 4, 2010
I have a button which I want to occupy 75% of the screen:
On a 480x800 resolution screen this would be 360 pixels wide.
On a 280x320 resolution screen this would be 210 pixels wide.
How do I go about specifying this in my layout XML file?
I understand there is a DIP unit of measurement, but does that also work to scale screen images for resolutions? What DIP measurement would I use for this, and do the images need to be saved at 160dpi.
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Sep 15, 2010
I have created a custom view by extending Relative Layout and it looks like this: The layout for the view:
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<RelativeLayout android:layout_width="wrap_content"
android:layout_height="wrap_content" android:gravity="center_horizontal">
<ImageView android:id="@+id/type_picture_preview"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:src="@drawable/type_picture_noimage" android:layout_alignParentRight="true"
android:paddingTop="15dip" android:paddingRight="15dip" />
<ImageView android:id="@+id/type_picture_delete"
android:src="@drawable/type_picture_delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true" />
</RelativeLayout>
</merge>
I am struggling to get two or more layouts on a single line.
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Aug 6, 2010
I have read the Android UI trick 2 on Android developers, which tells people how to include a layout in another layout file multiple times, and give these included layouts different id. However, the sample here is overwriting the layout id, not the id of the views IN this layout. For example, if the workspace_screen.xml looks like this: And I include it three times in another layout file. Do I end up with three TextViews with id firstText, and another three with secondText? Isn't there an id collision? And how do I find the secondText TextView in the third included layout with findViewById? What should I input in the findViewById method?
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May 7, 2010
Any insights/pointers regarding creating a layout like this. I have wasted quite a bit of time on this. I want to create a vertical linearlayout which has multiple ExpandableListViews separated by TextViews.
CODE:.........................
I tried the following approaches but each of them has one shortcoming or the other:
1. Add TextView and ExpandableListViews to a linearlayout. The problem with this approach is that LinearLayout by default is unscrollable.
Adding the LinearLayout to a ScrollableView creates even more issues because ListViews handle their own scrolling behavior.
2. I tried using a single ExpandableListView to model the above layout but the problem is that setGroupIndicator applies to the entire ExpandableListView, not a specific group.
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Aug 19, 2010
My application will have two layouts, one for large screens and one for normal. For testing I'm working with one phone (800x480 240dpi) and one tablet (1024x600 240dpi) but both are detected as large screen hdpi and long aspect ratio, so I'm not able to assign different layouts.
The only approach I think that can work is to create layout-large and layout-normal, get the resolution and programmatically set the layout folder. Is that possible?
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Mar 10, 2010
So my layout looks basically like this:
<ScrollView>
<RelativeLayout>
<BunchOfViews/>
<ImageView android:layout_alignParentBottom="true"/>
</RelativeLayout>
</ScrollView>
I have the ScrollView so all of the layout always is visible no matter the height of the screen. The problem is that on a very high screen, I still want my imageview to be at the bottom. However, a child of a ScrollView dont seem to have a defined bottom. The View is placed at the top of the layout. How can I solve this problem in a neat way?
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