Android :: Get Bitmap Data Before It Is Drawn On Screen
Feb 22, 2010
To any normal android Widgets based on View( Button ,TextView ...), I wanna manipulate the bitmap data before it is drawn on screen. I have tried the onDraw(Canvas canvas) method, But when the programe hit the onDraw(Canvas canvas) method, I think the bitmap has already been drawn to screen.
If there is any way that I can get the bitmap data before it's drawn to screen, so I can prevent it from being displayed , but grab the data, put it on the intent for some further use?
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Apr 28, 2009
From the javadoc of RemoteView, it said " * A class that describes a view hierarchy that can be displayed in another process."
But unlike View class, RemoteView does not have a 'draw(Canvas canvas)' method. Can you please tell me which method of RemoteView causing its layout to be drawn on screen?
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Oct 28, 2009
I am trying to take a screen shot of whatever is drawn on my custom view's canvas. The getDrawingCache() call returns null sometimes. Any pointers to what I am doing wrong here?
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Jun 29, 2010
My app keeps force closing before it starts, eclipse returns no errors in my code and my xml is good.
package com.mhe.test.scan;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class main extends Activity {
/** Called when the activity is first created. */
@Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button myScanButton = (Button) findViewById(R.id.myScanButton); myScanButton.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent("com.google.zxing.client.android.SCAN");
intent.putExtra("SCAN_MODE", "PRODUCT_MODE");
startActivityForResult(intent, 0);
} } );
} EditText totalbox = (EditText) findViewById(R.id.totalbox);
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == 0) { if (resultCode == RESULT_OK) {
String contents = intent.getStringExtra("SCAN_RESULT");
// Handle successful scan totalbox.setText(contents)
} else if (resultCode == RESULT_CANCELED) {
// Handle cancel totalbox.setText("@string/bummer");
} } } }
Essentially it is supposed to call zxing Barcode Scanner to scan a barcode on a button click and return the result into an EditText field.
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Oct 21, 2009
I want to try some fade/blur effect like in winamp visualization plug- ins. getPixel/setPixel way is very slow and do not allow to achieve decent frame rate. Direct access to pixels array could speed up processing.
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May 15, 2010
Basically I want to capture webpage from webview and get raster data of the bitmap. code...
Issue 1: Out of memmory exception when web page is big for eg. http://times.com What should I do to get this image? Is it possible to get image in multiple bitmaps?
Issue 2: How can i get RGB data 24 bit data from ARGB_8888. I need to get this 24 bit Raster data compress it with some compression and process it...
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May 16, 2009
I need to capture an image from camera and display on surfaceview for my project. I am trying to obtain bitmap from data in onPreviewFrame method of previewCallback and display on surface using canvas.
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Jan 29, 2010
In ActionScript development, there are two classes, Bitmap, and BitmapData. Bitmap uses information from BitmapData to create a Bitmap. Is there an equivalent to BitmapData in the android API? I did some digging and BitmapFactory seems to be the closest, however, I'm facing problems with it.
I tried Bitmap bitmap = BitmapFactory.decode Resource(getResources(), R.drawable.buster);
As that was what I was seeing in most of the examples I came across, but it is telling me that the method getResources is undefined. I'm not really sure what is causing this as in another tutorial I did, getResources didn't cause any problems.
I'm not looking to simply draw a bitmap to the screen, I want to copy a section of the bitmap and place it on a new bitmap. In ActionScript, the method is bitmapData.copyPixels(), and I'm looking for a similar method in the Android API. The closest thing I could find was copyPixelsToBuffer(), but I'm not really sure if that does what I think it does.
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Sep 8, 2010
My app will have an SQLite database with some embedded JPEG images -- basically the binary contents of a JPEG file stored as a Blob in the database. Can someone point me in the general direction of where to start to figure out how to convert this "array of bytes" into a Bitmap object that can be further manipulated and displayed in an ImageView?
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Jul 21, 2010
I have a very large image and I only want to display a section the size of the display (no scaling), and the section should just be the center of the image. Because the image is very large I cannot read the entire image into memory and then crop it. This is what I have so far but it will give OutOfMemory for large images. Also I don't think inSampleSize applies because I want to crop the image, not lower the resolution.
Uri data = getIntent().getData();
Input Stream is = getContentResolver().openInputStream(data);
Bitmap bitmap = BitmapFactory.decodeStream(is, null, null);
Any help would be great?
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Apr 2, 2009
I am 1) taking a picture and 2) then draw another Bitmap on top of it 3) then I store it
I am doing it as follows and it works on the emulator.
On the device I get a OutOfMemoryError: bitmap size exceeds VM budget android.graphics.Bitmap.nativeCopy(Native Method) android.graphics.Bitmap.copy(Bitmap.java:199) in the line copy the Bitmap to get a mutable Bitmap.
CODE:...........
What I am asking:
a) Is there a better way to do what I am doing? 1) take a picture 2) draw another Bitmap on top of it 3) then I store it
b) What is the best way to create a mutable Bitmap from the picture I just took with the camera?
In my app, resolution is not an issue. If it works better for small photos that would be fine.
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Aug 10, 2010
I have a bitmap that I load from the SD card by allowing the user to choose a picture to display. Once the bitmap is created, I set the Bitmap in an ImageView:
CODE:.........................
This works fine. But, if I change the screen orientation from portrait to landscape, and back again a few times, I always get an OutOfMemory exception.
In onPause, I call mBitmap.recycle(), and then on onResume, I call the above code again to create the bitmap and set the ImageView. Since I'm recycling the image each time, how can I get an OutOfMemory error?
In any case, since that failed, I found a post that said to try using onRetainNonConfigurationInstance() and getLastNonConfigurationInstance(). See post http://stackoverflow.com/questions/3250987/save-cache-when-rotate-device/3252547#3252547. I changed my code to work this way, and I still get an error. Changing the code, I had the call to getLastNonConfigurationInstance() in onCreate(), and removed all code in onPause and onResume. provide some way to simply load an image, and then be able to pause and resume the Activity without running out of memory?
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May 14, 2010
I'm working on an Android application that needs to download an image and display it inside an image view. The Bitmap is passed to the main java file and added to the image view like this:
CODE:.......
This works, except that the left side of the image disappears off the screen. The ImageView is in a ScrollView and the scroll view maintains the correct size. This means that there is black space to the right in the ScrollView and the image is cut off to the left.
The XML for the ImageView is this:
CODE:.......
Any idea why my image is being cut off?
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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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Jul 23, 2010
I am trying to set a different wallpaper for every home screen, but I get OutOfMemory issues. I have 5 Bitmaps which I am trying to overlay on a wallpaper Bitmap which is 5 times the display width. Using the code below I get OOM. The problem seems to be the first line of code which creates the large wallpaper Bitmap. My question is whether there is a way to do this (i.e. some way that takes up less memory, or someway to allocate more memory?).
CODE:.......................
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Oct 28, 2010
I have a large image on the screen and I want to display a small image on that image where I touch the screen. but I do not know how to change the position of the image when I touch on the screen and the small image must display where ever I touch on screen.
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Jun 3, 2010
Is there way to dump the current screen to a bitmap in Android?
And what about dump screen of other applications? For example, running a service background, the foreground app could send an intent to start the service, and capture the current screen and save as a bitmap.
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Oct 4, 2010
With imageview and network-thread,i am making live cam-view ,bitmap size is "360 240", after parsing network-data to bitmap. Code...
All thing is good ,i can see live-cam but, to fit image in screen like " Bitmap.createScaledBitmap(orgBitmap, width, height / 2 , true)" Seeing bitmap is getting slow , the bigger bitmap is , the more speed down finally, shut-downed.
how to fit image in screen without pain?
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Oct 8, 2009
I have two questions actually:
Is it better to draw an image on a bitmap or create a bitmap as resource and then draw it over a bitmap? Performance wise... which one is better?
If I want to draw something transparent over a bitmap, how would I go about doing it?
If I want to overlay one transparent bitmap over another, how would I do it?
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Mar 22, 2009
My goal is the draw a bitmap onto another bitmap but rotated 90 degress. whats the most efficient way to do that. My current method is as follows which is horribly bad because it creates a new bitmap every time.
CODE:.....................
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Jun 2, 2009
I just want to capture the updated screen data instead of reading all data from framebuffer. Can I get this data by what method?
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Jul 17, 2010
What I am trying to do - I am continuously getting a stream of lat/lng positions, I want to move a overlay item dynamically on the map based on the lat/lng in the stream. I am displaying the location of moving object dynamically on the map
I am putting my whole code in a while(true) loop and trying to read the stream every 5 seconds and refresh the overlays on the map. But overlay items are not shown until the function (either oncreate, or any onclickeventhandler etc) is completed. For example, test code, I am adding a single test overlay item when ever the user clicks on a button. If I put a wait(2000000) "after" I add overlays and invalidate the map, the overlay is not displayed until the time has elapsed and the function is completed.
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May 10, 2010
glReadPixels is too slow, so I need another way. Without testing object by object, Is there any other way?
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Jun 22, 2010
I want to draw a shape(many circles particularly) into a Specific Bitmap. I have never used canvas / 2D graphs etc. As i see it i create a Drawable put the bitmap in it then "canvas-it" to the shapes i want etc.
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May 31, 2009
I had it working with a normal View but that is to slow. I was told to use SurfaceView but can't figure out how to use OnKey with it and if I should use onDraw or draw? And how do I pass stuff to draw? does it happen automatically? code...
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Jul 8, 2010
I want to be able to get some reference to the curent object being drawn. code...
Above is my draw method and I want to extend the draw method to write the title underneath each item for example. This would require the .getTitle() method from the OverlayItem. Possibly some tracking of objects outside of this method but not sure where to put it....
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Feb 2, 2010
Based on the limitations of RemoteViews, it looks to me that the appropriate way to get it actually drawn on the screen is to use an ImageView in the actual layout, then when it is updating, create a ShapeDrawable or two and draw them onto a newly created Bitmap. Then, set that Bitmap as the source of the ImageView. There is Something about that process that I'm just not grokking, though. The following is the code I tried to use to update the widget. I get nothing drawn on the screen at all. The ImageView has a placeholder image just set by its src property. When I don't run the code to update it to my drawing, the placeholder image stays in place. So, I know this code is doing something, just obviously not the right thing.
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget);
Bitmap bitmap = Bitmap.createBitmap(100, 100, Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
ShapeDrawable drawable = new ShapeDrawable(new ArcShape(0, 360));
drawable.getPaint().setColor(0xffff0000);
drawable.getPaint().setStrokeWidth(5.0f);
drawable.setIntrinsicWidth(100);
drawable.setIntrinsicHeight(100);
drawable.draw(canvas);
views.setImageViewBitmap(R.id.ImageView01, bitmap);
appWidgetManager.updateAppWidget(appWidgetId, views);
I knew it couldn't be that easy. So, am I even heading in the right direction? Update Ok, maybe that was too much information. The question I'm really trying to ask is this: If I want to draw shapes on a widget, should I use an ImageView and create a bitmap from my ShapeDrawable or is there more appropriate way to draw into a widget where it is constrained by RemoteViews?
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Sep 8, 2010
I have an application that receives information from a database, and is used to visualize 2D bitmaps onto a GLSurfaceView. The information received will determine the x-position of the bitmap, and which bitmap image to use (there are 4 different bitmaps in my res folder to choose from).
Below are the three classes that are being used. The Activity sets the Shapes objects that need to be drawn by passing an ArrayList to the GLLayer class. This ArrayList is passed to the instance of ShapeStorage class via another setList method. This class is responsible for drawing when they are received.
The problem that I'm having is the following. Suppose I receive one object (let's say that it's a square at it's located at x=1). Some time goes by, and I receive another shape (this time, it's a triangle, and it's located at x=-1). However, when this new shape appears on the screen, the old bitmap's appearance changes to a triangle, and the new one becomes a square. In other words, the objects themselves are at the correct position that they are supposed to be at, but the bitmap being associated with them has changed. Does anyone know what the possible cause of this can be? I'm still a newbie to OpenGL-ES, and while this code looks very convoluted, it just involves setting a bunch of various properties for the View. code...
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Sep 23, 2010
I have a gray gradient drawable (png image in res/drawable). If I draw it on a white Canvas it looks banded (not smooth). If I put the gradient on white background in GIMP, and then draw this drawable on the Canvas, it looks great. What's the problem? I tested this on Nexus One. Calling setDither(true) on the drawable has no noticable effect.
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Jan 26, 2010
I'm considering to develop owner drawn EditText widget. So, what do you think I should read or refer, firstly? Or, could you give me some good examples of both owner drawn widget or custom widget?
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