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• Android Compound Control internal click events

  - by Simon

  Hi, I'm writing a custom compound control that extends RelativeLayout. Inside this component, there is an ImageView. I add a OnClickListener to this ImageView to animate it when the user clicks on it. But when I am in an activity using this control and I add a OnClickListener on the control, this listener is never called. It only works when I remove the other listener I have on the ImageView. Does anybody knows how to "propagate" the event to the other listeners when I catch it inside the control? Thanks! PS: I would also like to know if there is an existing control that looks like the icons on the Android desktop. Like an icon with text underneath.

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• Start Android intent from email

  - by AndersWid

  Hi! I need a good way of sending information TO the Android device that doesn't use a special server that has XML data. I would like to base this around email functionality. Lets say I send an email with some special text/link that when clicked starts and intent on the phone. I don't want to replace the users current email application. A clickable link would be the best thing "intent://data1:data2" or something along these lines. Speculations/solutions on how to proceed.

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• Android Service onBind -> onStart

  - by Gernot

  Hello, I have a comprehension question about Android Services. I have a Service that performs background http operations and a Activity that should display the current state of these http operations. So I implementet the Binder interface and so on. I can call the bindService method and onServiceConnected of my ServiceConnnection is getting called. But as far as I know, onBind doesn't calls onStartCommand() and so onStart() of the Service is never called. So how can I call the onStart() method of the service class and start my operations. Or how is the best way to start my operations in the service, when I also want a binding between the Activity and the Service.

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• Android Image Orientation Issue on Motorola Droid

  - by roundhill

  Hi there, Our app uses the gallery pick action to grab an image from the device to upload to a new blog post. We're seeing on the Moto Droid that images taken in portrait are being sent back to the app in landscape orientation so the image is sideways. AFAIK this only occurs on the Droid. Found this via google, but we need the full size image to be uploaded in the correct orientation so the solution doesn't work for us: http://groups.google.com/group/android-developers/browse_frm/thread/1246475fd4c3fdb6?pli=1 An easy way to reproduce this is to take a picture in portrait on the Droid, then send it to yourself via Gmail. In the email message, the image will be in landscape (sideways). I've tested on the droid 2.1 update and the issue is still there.

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• Writing Android apps in C#

  - by JamesBrownIsDead

  I'm a C# programmer and want to write an Android app. I'm a stubborn curmudgeon and refuse to write Java ever again (after switching to C# six years ago). Besides Mono and MonoDroid (and writing Java), are there any options for me? Or should I just feel foolish for refusing to returning to my Java roots? (Please refrain from Java-related vs. C# discussion. I was being rhetorical when I asked about returning to me Java roots.)

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• Android drawing cache

  - by Seva Alekseyev

  Please explain how does the drawing cache work in Android. I'm implementing a custom View subclass. I want my drawing to be cached by the system. In the View constructor, I call setDrawingCacheEnabled(true); Then in the draw(Canvas c), I do: Bitmap cac = getDrawingCache(); if(cac != null) { c.drawBitmap(cac, 0, 0, new Paint()); return; } Yet the getDrawingCache() returns null to me. My draw() is not called neither from setDrawingCacheEnabled(), nor from getDrawingCache(). Please, what am I doing wrong?

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• Masking a Drawable/Bitmap on Android

  - by Joshua Rodgers

  I'm currently looking for a way to use a black and white bitmap to mask the alpha channel of another bitmap or Drawable on Android. I'm curious as to what the best way to do this is. I certainly have a couple of ideas for how to do this, but they are not optimal. I need to be able to apply a new mask to the image every so often (the black and white bitmap will change every few seconds). Any feedback on how to achieve this would be greatly appreciated.

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• Jets3t on Android

  - by Chubbs

  Hey guys, I am trying to use the Jets3t library within an Android application, and I keep getting errors with the Rest service when I use the library. 04-27 16:47:39.491: ERROR/S3Service(225): Couldn't initialize a sax driver for the XMLReader I have tried to include the Xerces library and the Crimson library, and it dont play well. I get this error: Attempt to include a core class (java.* or javax.*) in something other than a core library. It is likely that you have attempted to include in an application the core library (or a part thereof) from a desktop virtual machine. This will most assuredly not work. At a minimum, it jeopardizes the compatibility of your app with future versions of the platform. It is also often of questionable legality. If you really intend to build a core library -- which is only appropriate as part of creating a full virtual machine distribution, as opposed to compiling an application -- then use the "--core-library" option to suppress this error message. Is there something I can do to get it working ?

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• Fireing Android Dialogs from another thread without Message Loop

  - by Jox

  In a SurfaceView, I'm dispatching new thread that draws on canvas within standard "LockCanvas-Draw-unlockCanvasAndPost" loop. (note that thread doesn't contains message loop). How to show Android standard Dialog from that thread? As thread doesn't have msg loop, following code doesn't work: Builder builder = new AlertDialog.Builder(this); builder.setTitle("Alert"); builder.setMessage("Stackoverflow!"); builder.setNegativeButton("cancel", null); builder.show();

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• How can I update information in an Android Activity from a background Service

  - by tmm

  Hello, I am trying to create a simple Android application that has a ActivityList of information, when the application starts, I plan to start a Service that will be constantly calculating the data (it will be changing) and I want the ActivityList to be in sync with the data that the service is calculating for the life of the app. How can I set up my Activity to be listening to the Service? Is this the best way to approach this problem? For example, if you imagine a list of stock prices - the data would be being changed regularly and need to be in sync with the (in my case) Service that is calculating/fetching the data constantly. Thanks in advance

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• How to handle Alarm notification in Android?

  - by Asheesh Vashishtha

  Hi, I'm developing an media player application for Android, for which I need to handle any Alarm notification, and based on that I'll pause my playback. When the Alarm in snoozed or dismissed, I'll then resume the playback. I googled a lot for the Alarm handling, but what I found was the way to enable Alarm notifications through code, set the intent and then handle it. However, no where could I locate just handling the Alarm notification part. I don't need to set the Alarm on, it could've been set by the user, and I don't need to programmatically. All I need is just handle that notification. Any ideas on this would be extremely useful? Thanks, Asheesh

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• Activity restart on rotation Android

  - by Isaac Waller

  In my Android application, when I rotate the device (slide out the keyboard) then my activity is restarted (onCreate is called). Now, this is probably how it's supposed to be, but I do a lot of initial setting up in the onCreate method, so I need either: 1. Put all the initial setting up in another function so it's not all lost on device rotation or 2. Make it so onCreate is not called again and the layout just adjusts or 3. Limit the app to just portrait so that onCreate is not called.

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• Android, simply view question about view reset

  - by javano

  I have a button in my activity, when you click the button an if statement is ran against its text label; if(BTN_1.getText()=="firsttext"){ //do some stuff, then... BTN_1.setText("secondtext"); }else if(BTN_1.getText()=="secondtext"){ //do other stuff, then... BTN_1.setText("firsttext"); } Firstly, if I hit the home button and go back to the desktop and then click back onto my app the view has reset its self; if I press the button and leave it in a state where the text of the button is "secondtext", when I return to my app it says "firsttext", how can I stop the view of my app refreshing its self like this? Secondly, under my XML layout I have defined the buttons text; android:text="firsttext" But this won't actually match my if statement above, under onCreate of this app I have: BTN_CONNECT.setText("Connect"); But visually the text of the button is exactly the same, why won't it match? Thanks for reading :)

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• Android RTSP coding problem

  - by NetApex

  I have Googled my butt off trying to find where if there is a surefire way to make rtsp work. I have a radio station that I listen to that streams via rtsp. Of course by default Android doesn't want to play it. If I pop the URL into yourmuze.fm and create a station there it lets me stream it to my phone. After checking how it works I come to find that it streams to the phone via rtsp! So obviously there is something amiss. What makes one stream work and one not? This is the stream I am attempting : rtsp://wms2.christiannetcast.com/yes-fm It is an audio stream so I would be thrilled with most peoples problem of "it only does audio and not video." When yourmuze.fm streams, DDMS states it brings up MovieView to play the audio if that helps at all.

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• Android color picker - updating color array

  - by zorglub76

  Hi all, I'm trying to create a color picker for Android that looks like a minimalistic version of Gimp's. So, it has a hue slider and a rectangle with saturation/value variants of a color chosen in hue slider. Question: what is the best way to create the rectangle? Right now, I'm creating an 200x200 array of pixels, but it takes ~5sec to create and display rectangle with that array. And I need colors in rectangle to change whenever I change the value in hue slider... Rectangle is bitmap, btw. Can I use color matrices on that and how? Any examples? Thanks in advance!

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• Android Rotate Matrix

  - by jitm

  Hello, I have matrix. This matrix represents array x and y coordinates. For example float[] src = {7,1,7,2,7,3,7,4}; I need to rotate this coordinates to 90 degrees. I use android.graphics.Matrix like this: float[] src = {7,1,7,2,7,3,7,4}; float[] dist = new float[8]; Matrix matrix = new Matrix(); matrix.preRotate(90.0f); matrix.mapPoints(dist,src); after operation rotate I have array with next values -1.0 7.0 -2.0 7.0 -3.0 7.0 -4.0 7.0 Its is good for area with 360 degrees. And how do rotate in area from 0 to 90? I need set up center of circle in this area but how ? Thanks.

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• Android app (with felix) crashes with LinearAlloc exceeded capacity

  - by user1106000

  I am running apache felix and an osgi app on android (3.2). This works pretty well so far, but I have rather large chunks of data to load into the application (osgi bundles). The problem with that is that when I load the biggest chunk of data I get LinearAlloc exceeded capacity The error seems to come from LinearAlloc.c \#define DEFAULT_MAX_LENGTH (4*1024*1024) if (nextOffset > pHdr->mapLength) { /* * We don't have to abort here. We could fall back on the system * malloc(), and have our "free" call figure out what to do. Only * works if the users of these functions actually free everything * they allocate. */ LOGE("LinearAlloc exceeded capacity, last=%d\n", (int) size); dvmAbort(); } afaik in 3.2/4.x it is even 8*1024*1024, but I still hit that limit. I'm looking to get better insight on what causes this problem and how I might possibly be able to fix it. Any help would be appreciated.

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• Android Cannot execute setListAdapter() user thread.

  - by Ameya

  I got a class class MyClass extends ListActivity implements Runnable{ ArrayList array; onCreate(){ Thread thread = new Thread(this); hread.start(); } @Overriding void run(){ addAnElement(); } void addAnElement(){ if(null==array) array=new ArrayList(); array.add("Some junck string"); this.setListAdapter(.....,array); } } on executing in emulator get error ERROR/AndroidRuntime(288): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. I know we cannot access UI calls from user thread. Can anyone help.

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• Android - Calling getJSONArray throwing JSONException with no stack trace

  - by Agathron

  Hi all, I'm currently working on an android app that pulls a list of forums from a JSON feed. I'm trying to parse the feed and immediately upon calling getJSONArray a JSON exception is being thrown with no stack trace. The JSON being returned is stored in an JSONObject jobj with the format as follows: { "Forum": [ {"ForumName":"CEC Employee Communications Forum","ForumId":"105"}, {"ForumName":"CEC External Stakeholder Relations Forum","ForumId":"109"}, {"ForumName":"See All...","ForumId":"0"} ] } However when running the following code, I get an immediate exception without a stack trace: JSONArray jarray = new JSONArray(); jarray = jobj.getJSONArray("Forum"); Running jobj.GetJSONArray("Forum").toString(); returns what looks to be a correct array of the format: [ {"ForumName":"CEC Employee Communications Forum","ForumId":"105"}, {"ForumName":"CEC External Stakeholder Relations Forum","ForumId":"109"}, {"ForumName":"See All...","ForumId":"0"} ] I also tried JSONArray jarray = new JSONArray(jobj.GetJSONArray("Forum").toString()); and had the exception thrown immediately. Any help would be greatly appreciated. Thanks!

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• How to draw a smooth/dithered gradient on a canvas in Android

  - by André

  Several answers mention to use GradientDrawable.setDither(true) to draw smooth gradients in Android. That has no effect in my code. Any idea what I have to change to get a well looking gradient in my live wallpaper? GradientDrawable gradient = new GradientDrawable(Orientation.TL_BR, colors); gradient.setGradientType(GradientDrawable.RADIAL_GRADIENT); gradient.setGradientRadius(canvas.getWidth() * 2); gradient.setDither(true);g gradient.setGradientCenter(-0.1f, -0.1f); gradient.setBounds(cb); gradient.draw(canvas);

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• Problems with cos and sin in Android

  - by bajen micke

  I have a problem with my code in Android. I am using this to moving a ball. If the degree is 90 it should move to the right, if the degree is 180 it should move down etc. This is the code I have done. int degrees=180; int bollspeed=4; bollX += bollspeed*Math.cos(Math.toRadians(degrees)); bollY += bollspeed*Math.sin(Math.toRadians(degrees)); The problem is that when the ball should move 90 degrees it moves 180, and when it should move 180 degrees it moves 270. I have tested all I could come to think... Can anyone see any error in my code or have a expanation I would be really glad. Thanks

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• Android cooliris gallery developer documentation

  - by mefesto

  Does anyone know how to integrate with the new Gallery3D app (cooliris android gallery)? I want to launch that app so it shows the thumbnails for only a specific folder. For example, say my app downloads images from my server and stores them in a folder on the sd-card (/sdcard/myapp/image-cache/someid/*). I'd like to be able to do something like the following: // within an activity Uri uri = Uri.withAppendedPath(Media.EXTERNAL_CONTENT_URI, "myapp/image-cache/someid"); Intent intent = new Intent(Intent.ACTION_VIEW, uri); startActivity(intent); Thanks.

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• Android: videocamera, limit length of videos taken

  - by AP257

  I'm working in Android and starting the video camera activity using ACTION_VIDEO_CAPTURE. Is there any way I can limit the length (in time) of the videos the user can take? I think this is possible if you use MediaRecorder, but I don't really fancy doing that since it's so much more complicated than using the simple ACTION_VIDEO_CAPTURE. Current code: Intent videoCaptureIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE); startActivityForResult(videoCaptureIntent,1); If it's not possible, does anyone know whether I could set a timer (TimerTask?) in Java and then show a Toast message after a certain length of time warning the user that they need to stop filming? (I'm a Java newbie, so I don't know if this is exactly what I need.)

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• Android Custom View to Activity communication

  - by Blumer

  I have a custom control/view that observes the direction of a gesture within its bounds. I would like to send a different message back to the Activity hosting the View depending on the direction of the gesture. I'm having a hard time determine what the right way to do this is. I would think I could raise a custom event in the control and then stick a listener on the control in the activity, but I cannot find any information on custom events in Android. Any help would be appreciated. Thanks.

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• Android Context.bindService always returns false and ServiceConnection object is never triggered

  - by mosfet

  I have followed the Local Service example provided by Google, but my Context::bindService(...) always returns false and there is ServiceConnection::onServiceConnected is also never called. I understand that Context::bindService() returns immediately, but my ServiceConnection object is never triggered. I don't know if these apply My activity is running inside a tabHost and I was wondering if that can affect service binding in any way. The Service itself may have a problem, but I can call start service to the same service with the same Intent and it works as expected. Does anyone have experience with this? Please help me out. Thanks, P.S. I am targeting Android 1.6

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