Android :: Converting A TextView - Bitmap - ImageView - Nothing's Showing Up
Nov 12, 2010
I started a test project just to get this down. No changes to main.xml. I want to create a widget-sized ImageView (80x100) that contains a Bitmap converted from a TextView. Yes, that sounds very roundabout but this is just for testing; in the end I want the ImageView to have a background image and multiple TextViews. I'm not sure exactly what I'm doing wrong, but nothing is being pushed to the screen.
Is it a problem with declaring the TextView/ImageView and passing it "this" in the constructor? Is it a problem with my layoutParams? Here is the code:
package com.doaf.testproject;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView; Code...
I'm relatively new to Android, and pretty lost with this one.
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Oct 6, 2010
How to show TextView and ImageView both in a single Gallery View. I want to show Image title for each image just below it.
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May 20, 2009
I would like to convert a Bitmap to a grayscale array of bytes (one byte per pixel). At the same time I want to just crop at section from the middle. Having looked though the various api's it is not clear to me what the best way would be.
1) What is ALPHA_8? is that grayscale? I have a feeling that the grayscale effect should be done via some "saturation" on the paint object, right?
2) once I have the Bitmap in grayscale and the right size, what is the best way to get that to a byte[] of pixels (one byte per pixel)?
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Sep 17, 2010
I have a picture taken using the phone's camera and in bitmap format. I want to send it over HTTP usinf Http post in ASCII.Any idea how to do it?
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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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Nov 24, 2010
this problem has been bothering me for days and I cannot figure out why on earth it is happening. I have a method that detects for a face, if a face is detected, the method will draw a rectangle on a canvas along the face.That part works fine.The problem is, when it displays to the image_view in my xml file, it will display on the far left middle of the image view, in a box, rather than in the center with the width as fill_parent.I thought of a possible workaround : to set the bitmap as a bitmapdrawable, but canvas only draws to bitmaps, so I can get the bitmapdrawable in the middle, but with no red box around it.I commented out my testing of bitmap drawable, and left it as what I have now...it only displays to my xml in the far left of the image_view.
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May 28, 2010
I have a Imageview in main.xml, how to set the bitmap the to the imageView in main.xml i can assign bitmap to the local image view in the below code...
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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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Jun 9, 2010
I have a Bitmap image (bm) and a an ImageView (iv) of 50 by 50 when i do iv.setImageBitmap(bm) ... only a portion of the entire image is seen ..How can i see the whole image in the 50 dip by 50 dip ImageView...
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Jun 4, 2010
I've read a lot of previous messages on this topic but couldn't find universal agreement on the whole. I can't reproduce this in house, but a customer got an OutOfMemoryError when using an icon chooser dialog.
This dialog is much like the Grid1 example - only it's in a dialog.
The bitmap memory seems to run out after running the dialog a few times for a customer, resulting in java.lang.OutOfMemoryError: bitmap size exceeds VM budget. Should I try to call recycle on the bitmap from an ImageView when I reuse the view? Or would the ImageView do that anyway?
But even if I do that, that's only a small portion of the bitmaps because most of them are seen without scrolling. The Adapter and the GridView are both local variables and therefore shouldn't be referenced after the dialog is dismissed.
I do believe that it should be possible to use many bitmaps in an app - Google Maps does it, Picture Gallery does it. But maybe I need to learn more rules. Some say you should call bitmap.recycle, some say you shouldn't have to. Many say calling gc.collect will make it worse, etc.
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Jun 13, 2010
I want to get the bitmap that is drawn when a textview is displayed but without displaying the textview in the activity. something like this:
TextView t = new TextView(this);
t.forceToDrawItself();
Bitmap b=t.getViewBitmap();
how is this possible?
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Sep 23, 2010
I have a ImageView acting as a top banner on top of a webview. The image of this banner is created in execution time dependending on the resolution of the device. The height of the banner is always the same for each resolution. The only thing that changes is the width, which changes according to the orientation. But, since the width changes and the height doesn't, I end up having sort of 2 images with different proportion. And this is way the scale down/up won't work out for me.
Another problem is that everytime the user rotates the screen, the banner image is created again but Android seems not to update the image and thus I have a banner missing part of it.
I thought about having a real big image that will fit for both landscape and portrait orientation. But this seems not to be a good idea since Android keeps resizing the image everytime so it will fit on the space of the ImageView.
I'm running out of ideas here. Can someone suggest something?
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Oct 19, 2010
Is it possible to add TextView and ImageView on canvas?
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Oct 14, 2010
I have an ImageView that contains a bitmap. Now the bitmap can change size within a known range. This makes the surrounding views to relocate which I want to prevent. I've tried setting margins and padding for the ImageView but without success.
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Sep 23, 2010
In my application I have a title(TextView) and an Image. The image is grabbed from the web and most of the images are different sizes. Some of these images are to tall and overlap on top of my textview, covering it up. Is there anyway to prevent this? code...
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Oct 5, 2011
I'm having a problem with incorporating an imageview with a textview into a list view.
Activity code:
Code:
ListView menuList = (ListView) findViewById(R.id.ListView_Menu);
String[] menuitems = {getResources().getString(R.string.playgamebtn),[code]....
displaying the imageview and the textview isn't the problem it is clicking on it. When clicking on the textview, there is an error with the ArrayAdapter.
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Feb 6, 2010
I coded an AppWidget the user can add to his homescreen. There are a bunch of images (ImageView) in it that perform different actions like starting Activities on click (realised with PendingIntents). To make it easier to navigate through the AppWidget I'd like to use the trackball (as it works with the SearchWidget or FacebookWidget) but I just can't make it work. Here's my layout code for the AppWidget...
So I want to be able to navigate through a bunch of these "Spots" that are all relativeLayouts. How can I make that work out? I'd be really happy about every hint or idea!
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Aug 11, 2009
I'm having a problem with setImageURI on my ImageView objects. I was using setimageResource(R.drawable.x), which was working fine, but now I'm trying to change over to using URIs so that I can be more flexible about my image source (not constrained to pre-packaged images).
I'm using ImageView.setImageURI(uri), where uri is (for example android.resource://com.example.hellogridview/2130837520, which I created by doing Uri.pars ("android.resource:// com.example.hellogridview/" + R.drawable.x). I took this method from my MediaPlayer, where I created URIs for R.raw wav files from this path.
It's not throwing any errors that I can see, but it's just displaying blank images. The images are ~150px each way and I'm displaying them about half size - would that cause a problem?
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Oct 20, 2009
I have a normal TextView which has multiple lines. I set its max number of lines to 3. I'd like it to show an ellipsis at the end if the text is too long:
TextView tv = new TextView(context);tv.setLines(tv); tv.setText("some really long text.");
I tried the set ellipsis calls but it doesn't seem to do anything - the text appears the same way. How do we get this to work?
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Aug 6, 2010
What i m trying to do is, just showing numbers from 1 to 100 in a textview, randomly, and keep on changing until the view is active.
But i am not able to continuously change random number when view is active.
it is just like a timer showing decrement from 10 to 0, but the only difference is i need to show random numbers in between 0 to 100.
How can show this on my view. this is how i am trying to do something..may be a better approch will help me out. Code...
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Jun 27, 2010
In testing my app across different OS versions I've noticed what appears to be carriage returns showing as visible squares in TextView. This doesn't happen on Froyo wondering if anyone knows how get around this in previous versions?
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Aug 18, 2010
I'm wondering how I can create a custom pop-up like the one in the screenshot below (borrowed from the Swype keyboard), where I can have a couple of buttons, which each commit a string to the currently "connected" TextView (via a InputConnection). Please note: this is an InputMethodService and not an ordinary Activity. I already tried launching a separate Activity with Theme:Dialog. However, as soon as that one opens I lose my focus with the TextView and my keyboard disappears (and with that my InputConnection is gone).
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Feb 18, 2010
I've created an application that show around 250 images in ImageView. Images are loaded one after another, 15-30 images per second. Basically the whole thing gives an illusion of a rotating 3D object, at least it should.
The problem is next, app hangs when loading certain images(i.e. I see a few seconds of fluid animation and then animation hangs, jump 10-15 frames(images) ahead and continues. It always happens at the same places in animation cycle.
I though that Android might not have enough resources to handle something like this, so I've resized images to half their size, but it did't help. I've tried buffering images but that did't help either(actually, maybe a little, I think that animation looks a little bit smoother).
And now the weirdest thing. I use the touch screen to allow users to "rotate" the 3D object on those images, and while rotating I again experience those hangs at exactly the same places as with the animation.
All images are in .png format and their size vary from 15kB to 40kB.
I use the following code for the animation:
CODE:.....................
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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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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 15, 2010
I have a listlayout with items in it that looks like this:
There is first an ImageView (the light) and then two textViews. All of this inside a TableLayout. (source here: http://code.google.com/p/switchctrl/source/browse/trunk/android/res/layout/device_switch.xml)
I want to have a rotating animation of a loading indicator Ontop of this light when this particular device (light) performs an action or an action is performed on it.
How do I put an animation ontop of this light imageview?
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Nov 16, 2010
I want to do something like that. For example, I have a textview with String
Alibaba love Mary so muck. In that String alibaba and Mary have a event to open something but I can't know how to use event for Mary and Alibaba seperately
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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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