Android :: How To Draw Button On Top Of View?
Jan 8, 2010
I am creating a android app using LunarLander as a example.Now I need to create a few buttons which are drawn over the view.I do not want them as a seperate layout above or below the view but in the custom view.Is this possible or am I going to have to programmatically show the button images then detect the touch. The buttons I create using new never show on the app. I assume this is because I have overwritten the onDraw and the buttons are never drawn even though I call.
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Jun 21, 2010
I have a class which extends a View and I'm drawing few images in the canvas. and i want to draw two buttons as well. could someone tell me how to do this? code...
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Mar 29, 2010
I'm just getting started with developing for Android. I'm looking to port one of my iPhone applications, but I'm kind of at a loss for how to draw a view at runtime (a view not declared in the XML). Basically, I want to draw a simple rectangle, but then be able to manipulate its frame after being drawn. Sorry if this is a really, really simple question, but I can't seem to find some equivalent to the iPhone SDK here.
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Aug 9, 2010
How do I draw a view on top of image. There is a predefined android xml file and when I run the application I would like to bring up a dot or a square on the top of image. Here the image already shows up from pulling information from andrid res folder , how to draw an dot over it.
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Mar 4, 2010
Let consider this is my tile view (which is a bitmap):
0 0 0 0 0 0 0 0 0
First, I have change the view to
1 0 0 0 0 0 0 0 0
Second, I would like to change the middle one, and I expect the result is 1 0 0 0 1 0 0 0 0
However, the view give the result: 0 0 0 0 1 0 0 0 0
Is there any method that I can draw the particular part but now the whole view? code...
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Dec 2, 2009
Between each row in list view, android draw a horizontal line (fades away at both ends). If I have a LinearLayout view, how can i add a border like that?
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Dec 20, 2009
How to draw line on MapView given coordinates?
AFAIK, on iPhone it is possible.
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Sep 28, 2010
I want to draw a straight vertical line on my Android activity, when a button is pressed. Please explain how I can draw the line with a position & length I want.I have a linear layout with vertical orientation. A set of buttons constitute this linear layout. When I press one button, I want a line to appear to the right of these buttons, like dividing the screen halfway - a straight line of width=2dip and height=200dip.
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Oct 29, 2010
I'm trying to create a MapView in a service (live wallpaper), but have it hidden so that I can render it to a Bitmap, and then map it to a texture to render in opengl. I have a Canvas and a Bitmap, and I intended to call myMap.draw(myCanvas) in order to get it into the correct bitmap so that I could then bind it as a texture.
When I Initialize I do the following:
myMap = new MapView(ctx, APPSTATICS.MAP_API_KEY);
I get an error:
java.lang.RuntimeException: stub at com.google.android.maps.MapView.<init> (Unknown Source)
Why I can't create a new mapview which I can use to draw to a offscreen bitmap?
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Aug 9, 2010
How can I draw an dynamic view on top of mainscreen in android.
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May 29, 2010
I have a simple program that draws the preview of the Camera into a SurfaceView. What I'm trying to do is using the onPreviewFrame method, which is invoked each time a new frame is drawn into the SurfaceView, in order to execute the invalidate method which is supposed to invoke the onDraw method. In fact, the onDraw method is being invoked, but nothing there is being printed (I guess the camera preview is overwriting the text I'm trying to draw).
This is a simplify version of the SurfaceView subclass I have:
public class Superficie extends SurfaceView implements SurfaceHolder.Callback {
SurfaceHolder mHolder; public Camera camera; Superficie(Context context) { super(context);
mHolder = getHolder(); mHolder.addCallback(this); mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
} public void surfaceCreated(final SurfaceHolder holder) { camera = Camera.open();
try { camera.setPreviewDisplay(holder); camera.setPreviewCallback(new PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera arg1) { invalidar();
} } ); } catch (IOException e) {} } public void invalidar(){ invalidate(); }
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
Camera.Parameters parameters = camera.getParameters(); parameters.setPreviewSize(w, h);
camera.setParameters(parameters); camera.startPreview(); }
@Override public void draw(Canvas canvas) { super.draw(canvas);
// nothing gets drawn :( Paint p = new Paint(Color.RED);
canvas.drawText("PREVIEW", canvas.getWidth() / 2, canvas.getHeight() / 2, p);
} }
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Sep 29, 2010
How can i draw a view on a canvas by giving the x,y position in the canvas.
For example,
I have custom view myView, which was created by inflating one of my layout.xml file.
Now i want to draw this myView on the canvas at position (x, y).
How can i do that? code...
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Jul 6, 2010
My objective is to run a glowing animation on an image.I am changing the image alpha to produce this effect.
I have used basic AlphaAnimation provided in android framework but found that its slowing down other animations. So i extended a class from SurfaceView and created a thread to update it. ( Again here, i am manipulating alpha of the image ).
Everything seems fine, except that i am not able to draw a transparent image onto SurfaceView.Its showing black color on the transparent areas of the bitmap.code...
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Aug 14, 2010
What is the simplest way to draw pixels, lines and circles on a View?I want to move a cross cursor around, so nothing particularly intensive.I thought I could extend SurfaceView and add it to an XML and it would just work, but it just appears black, however, when I look at the layout view of localmap.xml in eclipse, the graphics appear as expected. Any ideas? My onDraw is never called on the emulator, and even calling invalidate on the class makes no difference. I shall keep trying but can anyone see anything I've missed? or is there a better way entirely? Code...
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Oct 4, 2010
I am using a Gallery view where the view corresponding to each item is non-trivial and consists of text as well as multiple buttons. When I click to drag the gallery view (somewhere not on one of the buttons) the button's drawable state changes to pressed and appears as if all of the buttons are currently being pressed. Additionally, the same behavior happens for the selected state (e.g. all of the text of the child TextViews changes color). I am trying to prevent this behavior and have found the android:duplicateParentState xml attribute as well as the setDuplicateParentStateEnabled property. This seems like it should accomplish what I am trying to do, but it seems to have no effect.
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Apr 5, 2010
I have a custom component which consists of 2 text view and 4 toggle buttons. I want to draw this view at some specific position on the screen. How is that possible?
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Aug 23, 2010
I have a SurfaceView that is being used to draw images, and I would like to overlay them onto a live-feed from the phone's camera. Currently, the SurfaceView that contains the images have a white-background, but if I were to overlay them onto the phone's camera feed, they would have to be transparent. The camera and animation drawing cannot be done on the same SurfaceView. What is the best course to pursue the use of multiple views that involve managing the camera and drawing images? Is it possible to make a SurfaceView transparent?
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Jan 1, 2010
This is really frustrating, I am trying to get a carriage return drawn in my custom view and nothing is working. I have tried 'System.getProperty("line.separator")' but that makes it say null and I have tried '
' and '
' and those just both draw a little square. I am using the canvas.drawText meathod.
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Jan 27, 2010
I am creating a button programmatically. It is rounded and has a gradient background, and works fine and looks nice, but I couldn't do two things I wanted:
Set a 1 pixel stroke with a given color. I tried getPaint().setStroke(), but couldn't figure how to set the stroke color. How should I do it?
Align the gradient to the bottom of the button, no matter what height it has. Is this possible?
For reference, this is the code I'm using:
CODE:...................
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Sep 5, 2010
In my android application I use this method in "draw" Overlay class for draw route on map. Can someone tell me if this method is good (in terms of performance) for route draw on map or I must to put code in Thread ??
I'm new to android.
public synchronized void draw(Canvas canvas, MapView mapView, boolean shadow) {
if (pointsAndTimes.isEmpty()) {
return;
}
Projection projection = mapView.getProjection();
Paint paint = new Paint();
paint.setARGB(250, 255, 0, 0);.............
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Jan 1, 2010
I am looking for a view or some sort of information regarding the bottom bar in default applications of Android such as Email, or Unlock pattern as shown in the picture below. I have not been able find anything about this on Androids site nor from Google searches. Image: http://img11.imageshack.us/i/viewdn.jpg/
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Dec 16, 2009
I want a fix "Cancel" Button at the bottom of the ListView. I want my list View to be scrollable and fix Button at Bottom.
I had added the Button at the bottom of the list with addFooterView (button); but if list is longer than the screen, then we have to scroll down to get the button and if list is very short then Button will be at the middle of the screen just bellow the listview :(
I got Ramain Guy's suggestion of setting height = "0dip" and weight = "1" but by doing this nothing is appearing on the screen (blank view)
Note: my ListView is one tab of the TabHost.
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Jun 30, 2010
Let's say for instance a button is needed with a picture and a text. It would seem natural to create an xml view and then inflate it into the Button. Is this possible?
At the moment I don't need the button to look clickable or change it's color at click, but it could also be interesting to consider how this will be affected by making the inflate.
Btw, I found this one tutorial describing a solution to the same problem, but they were writing a class extending View to obtain the goal. That seems a bit overklill to me. http://kahdev.wordpress.com/2008/09/13/making-a-custom-android-button-using-a-custom-view/
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Apr 5, 2009
I'm trying to create a button in a custom view that I've created. I'm looping through an XML document and drawing certain things. I want to be able to also create buttons to go in certain locations depending on the xml data. I'd like to do it in the view because I want to be able to call invalidate() on my view to redraw things and replace the buttons when new xml data is available.
The problem is that I put my code in the view class, the activity crashes because the button is "null".
Here is a subset of my code:
CODE:............
I know this code works for creating buttons because I can put it in my activity class and it works just fine. Any suggestions? I thought about relocating the button in the activity, but I can't figure out how to do this when new data is available.
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Nov 7, 2010
I have a button defined in my XML file. The button works exactly like you would expect...that is until I add the line at the bottom (android:background="drawable/leftarrow1"). Then the button is no longer click able in the activity, but the new background shows up like I want. What gives?
<Button
android:id="@+id/switch_left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_center Vertical="true"
android:background="@drawable/leftarrow1" />
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Jul 20, 2009
How can i place a Image Buttons on the Image View. If i click the grid view i vl get a image in full screen i want tplace the imagebuttons on the images how can i place that.
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Dec 30, 2009
Suggestion for the Marketplace: Change the "View more applications" button to be called "More by developer".
Note: It is under the "About the developer" title, however, I doubt many people take notice of the title.
Please leave a comment or suggestion if you agree / disagree.
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Jun 30, 2010
I want to show the details of a list item in another activity when clicks on a button.Can you help me?
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Mar 12, 2010
i have an android listview filled with items.Every item has a button.This is the template of the my listview.
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:paddingBottom="6dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:paddingLeft="5px"
android:paddingTop="5px"
android:paddingRight="5px"
android:gravity="left">
<TextView android:id="@+id/TextView_test1"
android:layout_width="200dip"
android:paddingLeft="0px"
android:layout_height="wrap_content"/>
<TextView android:id="@+id/TextView_test2"
android:layout_width="250dip"
android:paddingLeft="0px"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<TextView android:id="@+id/TextView_test3"
android:layout_width="400dip"
android:paddingLeft="0px"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<Button
android:id="@+id/Button_buttontest"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Button_buttontest"/>
</LinearLayout>How could i handle the click of each button in the activity code?
Each button has the same id "Button_buttontest"?
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Sep 8, 2010
I am trying to port an existing iPhone application to android. I wish to have a button scroll into view at the bottom of a GridView to enable the user to load more data from the server. Presently, my solution simply fixes a button at the bottom of the screen instead of having it scroll into view.
Here is my layout code:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android
android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" >
<GridView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/grid"
android:layout_width="fill_parent" android:layout_height="wrap_content" android:columnWidth="70dp" android:numColumns="auto_fit" android:verticalSpacing="0dp" android:horizontalSpacing="0dp" android:stretchMode="columnWidth" android:gravity="center" android:background="#000000" />
<Button android:id="@+id/load_more" android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="Load More" /> </LinearLayout>
Fixing the button at the bottom of the screen won't work because I plan on placing an ad at the bottom. Can anyone either explain conceptually how to get a load more button to scroll into view, or point me to some sample code, OR tell me why this is not idiomatic to Android and what other UI convention it uses to load more data in a GridView?
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