Android :: Smartest Way To Draw 100 Images On Screen
May 24, 2010
First of all I'm a newbie when it comes to Android programming. So if this question is totally stupid please delete it ASAP Question: I'm going to draw a grid of 10x10 PNG images. Each image is 32x32 px. All of the images are unique. I'm thinking that the easiest way seems to be to put each image in an ImageView. If adding all ImageView's to the layout would this give me some kind of performance hit?Would there be any smarter way to draw these images?
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Nov 13, 2010
I have some images that I want to put on top of each other on random order. If it possible using one ImageView or do I need to create multiple image views based on number of images?
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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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Oct 31, 2010
Is there a way to draw on or modify the key guard wallpaper programmatically?It looks simple enough for the home wallpaper, you can use WallpaperManager. But how about for the lock screen wallpaper?
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Jun 5, 2010
I have a little app that draws moving animations in a surface view. Cute, useless time waster. I think it could be cuter if it were possible to get a surface view that mapped to the home screen icon for the app and animate that when the app is running and the icon is visible. Is that possible? I remember way back in the days of Windows 3.1, that when your app was minimized, it was possible to draw to the minimized icon as though that were the app window (actually, I guess it may just have been the app window). Anyway if such a thing is possible in Android, I'd like to try it. Anybody know?
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May 15, 2009
Is it possible to draw on the incoming call screen? I know that a few of the whitepages apps do it, but I would like to know how.
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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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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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Apr 13, 2009
Want to draw a line when I touch screen at two points. I can see OnTouch been invoked but after than everything breaks looks, the application crashes
I am using drawLine in Canvas.
CODE:......................
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Aug 1, 2009
I've this code:
Java: (http://nopaste.me/4449 )
package com.patrick.games.whackgroundhog; import android.app.Activity;
import android.content.Context; import android.graphics.Canvas;
import android.graphics.Color; import android.graphics.Paint;
import android.os.Bundle; import android.view.MotionEvent; import android.view.View;
public class Game extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); setContentView(new Ground(this));
} class Ground extends View { public Ground(Context context) { super(context);
} public void onDraw(Canvas canvas) { canvas.drawColor(Color.BLACK);
} @Override public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
//TODO: draw the circle } return true;
} } }
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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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Jul 22, 2010
Can some one show me the sample code to draw a rectangular pulse in android screen. I want to generate a bunch of them on x axis (which I imagine as middle of screen).
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Nov 11, 2009
I write graphics apps for the iPhone and I'm looking to port my most recent app, 'Layers,' to the Android platform. Layers is painting app that allows users to draw on the screen and create multi-layered paintings with different brushes, colors, etc... and export to PSD. It's got desktop sync, a smudge tool, lots of good stuff... http://www.layersforiphone.com/
I started looking at the Android platform Monday and I've run into a major problem. I use OpenGL to do all the drawing because it offers the best performance. However, there are several places where I need to render into a texture and then use the texture.
For example:
Use brush texture and a line of sprites to create a black paint stroke in texture A Put brush color+alpha in glColor4f and then draw texture A onto the screen.
On the iPhone, I do this continually as the user's finger moves and I am able to achieve 12-15fps on a 1st gen iPod Touch. It's necessary because applying color and alpha to the individual sprites making up the brush stroke doesn't produce the right result (since sprites overlap and make the stroke too dark).
The android platform supports OpenGL ES 1.0 but seems to omit key functions for dealing with framebuffers. I can't find a way to bind a texture to the framebuffer and draw into it using OpenGL.
Here's how I'd normally go about it on the iPhone:
CODE:....................
Is there anything like this on the Android platform? On the iPhone, OpenGL is significantly faster than software-based drawing and is the only viable solution (trust me - I wrote a CoreGraphics painting app too...). Maybe there's another route I could take on Android? I'm willing to jump through whatever hoops are necessary, but I won't publish the app unless performance is good (10fps+ as you're drawing on the screen).
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Aug 20, 2010
I would like to know how to get a pre-saved image from the gallery and then display it onto the screen. Any tutorials/helpful links and info would be appreciated. If there is anything you would like me to explain more, please ask.
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Nov 5, 2010
I need to have a layout for my widget, but I don't know how to arrange my images on widget screen. I need to have 4 small Images on first row then 2 Images on 2nd row 1 Image on 3rd row and 1 Image on 4th row Could someone create the xml file ?
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Sep 12, 2009
Is it just me or does anybody else notice as well that the images uploaded to ones Android Market's publishing site are heavily compressed. When I look at them after they're uploaded, i can clearly see ugly JPEG-compression artifacts.Is there a way to make sure that the quality of the images stored on Android Market's servers is better?
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Feb 11, 2010
I have been developing on a ADP2 (Google Ion) with a "standard" screen size (with a resolution of 320x480)... Our designer made some pretty neat Images with which to create the GUI, and when placing everything within the layout XML files it looks pretty good... That is, on the Eclipse renderer, the one who shows you how it will look like on the device... Thus not the emulator itself... Unfortunately when run on the real device the supercrisp and beatifull images become blurry and unsharp... I actually do'nt see why this should happen ? Everything has been designed whilst keeping the target devices resolution into account... Is this because most probably the dpi of the screen on which the Images were (big 24 inch screen) is different that the devices? And if so how can this be corrected (maybe within the designers application as well, I think he uses Photoshop).
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Apr 7, 2010
I wrote a home screen widget with one image on it. When the image is clicked, browser will be opened for a url link.
Generally, it is working. But a weird thing is that, when I click background, then click the picture, the browser will not be open. Until I click the second time on the picture, the browser opens. The steps to reproduce is below:
Click on the home screen widget background.
Click on the image on the home screen. The browser is not opened.
Click on the image again. The browser is opened.
If I didn't click on the background, the image will react to click very well, i.e. browser will be open when the image is clicked the first time.
The widget XML file is as below:
CODE:..................
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Feb 4, 2009
Here is the problem, I am building an application and have multiple images that need to switch when the user touches the screen, doesn't matter where the users touches. The press the screen and the images switch randomly. I purchased the ebook "Professional Android Application Development" and have torn though it. I am stumped. I'm thoroughly confused at this point. Any ideas on where I can go or how I can accomplish this?
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Nov 2, 2009
I'm basically using the same method of loading bitmaps in OpenGL that the SpriteMethodTest example uses and have been unable to get rid of an annoying outline that appears around all of my images.
For example, If I were to load an image of a white circle on a white background, I would expect to see nothing. Instead, I would see my circle because its edge would be gray. In SpriteMethodTest, I replaced the background image with white and was able to see that the edges of the android images flying around also don't seem to be rendered correctly.
Does anyone know how to load images in OpenGL without having a thin outline appear around the images?
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Oct 31, 2010
I am building a android aplication which will be consuming a json file from the internet. This json file contains a list of news from a particular website. Each json object contains information such like title, summary, descripition and web links for the news thumbnail and the original image.
I will be displaying in a listview three information: the news thumbnail, the title and the summary. Here resides my problem. I dont want to load all thumbnails from the internet if they wont be displayed. What I am trying to say is that why download a thumbnail from the 30th news if the user wont scroll down the image. So, i will, initially only download the thumnails from those news that are being displayed in the screen and when the user scrolls down to see more news, as soon as the list item appers to the screen i want to download the image and then display.
Is there a way to achieve this? Is it possible to find out if the list item is on the screen? I have been searching all over the internet for a solution for this but i am running out of ideas.
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Apr 6, 2010
I'm working to convert some background images to nine patch so they scale better on different phones.
The problem is that if I have the following resource structure: drawable-hdpi/background.png drawable-hdpi/button.png drawable-mdpi/background.png drawable-mdpi/button.png drawable-ldpi/background.png drawable-ldpi/button.png and then I drop a new drawable-hdpi/background.9.png file into the mix, it breaks button.png during the pre-compile. The error is "No resource found that matches the given name (at 'background' with value '@drawable/button').Simply removing that one nine patch file fixes the build. Should I be able to have some nine patch images and some normal ones, or to have nine patch only in hdpi but not mdpi or ldpi? This is Eclipse 3.5.1 with the latest ADT.
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Feb 4, 2010
I'm trying to develop a 2D game to android using opengl. I know how to print images on the screen and animate them. But in my game I have a map and a want to zoom in and out and scroll the map. But I can't figure out the best way of doing it.
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Jul 18, 2010
Just curious how many have this issue.If you are unsure select the link below and find out pls.
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Oct 22, 2012
Why do apps like Screencast require Root access in order to record/capture screen images?
Motorola Photon 4G
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Jun 21, 2010
I want to have a elmenent with a 2 color border outline. I can do a single color outline using the element, but this only allows me to draw a single line. I tried using 2 elements within my but that didnt work either. Is there a way to either draw a shape within a shape or draw 2 lines around my shape (which has rounded corners btw).
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Jun 23, 2010
1.myJpegFile = new File("images/jpegImage.jpg");
2.output = new BufferedOutputStream(new FileOutputStream(myJpegFile));
3.encoder = JPEGCodec.createJPEGEncoder(output);
4.encoder.encode(myJpegImage); Please could you give me the equivalent code for line no. 3 and 4 in Android?
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Nov 11, 2010
I'm trying to figure out how to draw on a bitmap in android, and keep a copy of these changed bitmaps for an undo function.
Bitmap b = ...
Paint p = new Paint();
canvas.drawBitmap(b, new Matrix(), null);
canvas.drawCircle(0,0,20,20);
//does Bitmap b have the circle drawn on it next time?
Or how do I get the bitmap after its been drawn on with the canvas(I want to preserve a stack of bitmaps with the changes applied by canvas drawing)? Maybe I'm going about this entirely wrong.
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Sep 2, 2009
I'm new to openGL and I have done some first tests with drawing a triangle. Now I would like to draw a circle, which is filled with a texture, but I have no idea, how to do so.Can someone of you give me a hint?
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Feb 16, 2010
I want to draw charts like pie charts to display stats in my Android app. As Android doesn't support Swing and AWT, i wonder how can i draw charts in Android? Please note that i don't want to use a third party tool.
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