Android :: Write Contents Of Custom View To Large Image File On SD Card
Mar 12, 2010
I have a class that extends View. I override the onDraw method and allow the user to draw on the screen. I am at the point where I want to save this view as an image. I Can use buildDrawingCache and getDrawingCache to create a bitmap that I can write to the SD card. However, the image is not good quality at a large size, it has jagged edges. Since I have a View and I use Paths I can transform all by drawing to a bigger size. I just don't know how to make the Canvas bigger so when I call getDrawingCache it doesn't crop all the paths I am just transformed. What is happening is I transform all my paths but when I write the Bitmap to file I am only getting the "viewport" of the actual screen size. I want something much bigger.
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Nov 2, 2010
I have created a app that displays all the content from res/raw folder. I need that when I click on .doc file it should open and I can view its content. I have ThinkFree.
Enter code here:
public class FileList extends ListActivity {
public static final Field[] fields = R.raw.class.getFields();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setListAdapter(new ArrayAdapter<Field>(this, R.layout.row, R.id.weekofday, fields));
} @Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
//super.onListItemClick(l, v, position, id);
String selection = l.getItemAtPosition(position).toString();
Toast.makeText(this, selection, Toast.LENGTH_SHORT).show();
Intent i = new Intent();
i.setAction(android.content.Intent.ACTION_VIEW);
startActivity(i);
} }
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Feb 4, 2009
We have ported android to our hardware. I am facing some issues related to sdcard. Here is the test scenario and issues:
First issue :
1. On hardware, insert the card and copy a file to sdcard using dd command.
2. Remove the card from hardware.
3. Do ls /sdcard. It shows the file present in sdcard. It seems unmount of sdcard device is not happening.
Second issue:
1. Copy a file to sdcard using dd command.
2. Remove the sdcard and check the content of the sdcard from PC. File is not visible.
3. Copy file to sdcard again and then check the content of sdcard from PC. File size is zero bytes.
4. Restart the hardware and copy the file again. File is visible when checked from PC.
Third issue:
1. The content of copied file are not matching with the original source file.
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Nov 2, 2010
I'm trying to download a large .zip file from a web server but I have a weird behaviour, the description is:
- I'm executing the code in the device emulator, API level 3 (version 1.5) with an SD card of 512MB. I start the device with "Wipe data user"
- The length of the size from conexion.getContentLength() is 7012725
- The server address is localhost (10.0.2.2), but I've tried with an external server and the behaviour is the same. I've double checked that I can download the file through a web browser.
- I have these permisions in the manifest file:
CODE:.............
The error:
- It starts downloading the file, I can see the text 10, 20, 30, 40, 50 and then it stops at 60. - After a while, the emulator reboots itself.
Workarounds:
- About the possible wifi lock, what I've done is add this permission "android.permission.WAKE_LOCK" and then this piece of code, but with exactly the same behaviour:
CODE:.............
Here is the code, that it's being executing in a separate thread:
CODE:.............
more log description:
CODE:................
Could anyone try my code and download a zip file with size round 8MB? Does it works for you?
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Mar 17, 2010
I'm trying to write a file from an Http post reply to a file on the sdcard. Everything works fine until the byte array of data is retrieved. I've tried setting WRITE_EXTERNAL_STORAGE permission in the manifest and tried many different combinations of tutorials I found on the net. How my app writes file is by using a thread. Specifically, a thread is invoked from another thread when a file has to be written, so giving an activity object didn't work even though I tried it. The app has come a long way and I cannot change how the app is currently written. CODE:..................
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Jul 3, 2010
Today, i tried to read and write file on the android. but it seems that file write mode is only provided for SD card? most of article is asked about SD card written. Is there no way to save data internal side?So when i install the application to real device. then its application installed in SD card or internal space? because we have make it log file from our application for everytime while application run.So, how do we write the file to SD card and specified the absolute path where we saved? to load this file.
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Dec 14, 2009
I'm trying to create a file on the sd card.but that throws a FileNotFoundException. Isn't OutputStream supposed to create the file, if not found on disk? I'm looking to write image data there.This is on a 1.6 emulator. I have an SD card installed, I'm looking at the sdcard folder through DDMS, so it's there.
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Feb 18, 2012
I developed a cramfs rom for the np7 after user dochoppy found root for the nextbook premium 7 tablet, but he then converted to ext3 which because its packed with features will be more popular. So I am trying to edit his ext3 rom in Ubuntu 11.10 and here is what I do:
1. Copy and paste system.img to desktop
2. Create a folder called system on desktop
3. In command prompt:
cd ~/Desktop
Sudo mount -t ext3 -o loop system.img system
(Asks for pw)
4. Doc said something about only being able to edit as root, so after some Googling I find out how to create a program that grants root.
5. (Open "run as" program) then I type "nautilus /home"
(Asks for pw)
6. Navigate to mounted system and I have read/write privileges (but only in this window)
7. View the system mount properties, and it says I have 14.2 mb free space on device
8. Delete files throughout the system folder to make room (but when I refresh properties, free space increase doesn't show)
9. Try to add my own files after deleting some others, ans rather than using the increased space, it just fills the fourteen megs before telling me "device is out of memory "
why is the system not physically making the proper system increase and decreases.
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Nov 16, 2010
I need to directly read/write a file on sd card without cache. I can use "posix_fadvise" to achieve the purpose on Ubuntu I try NDK to make the function call, but it seems disabled on Android How can I do?
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Mar 1, 2010
Is there a right associated with write/read access to the sd card that needs to be set in the manifest.xml file? I'm currently trying to write to the sd card using a standard FileOutputStream here:
FileOutputStream out = new FileOutputStream("/ sdcard/images/"+imageName);
bmp.compress(Bitmap.CompressFormat.JPEG, 90, out);
But it doesn't seem to be working. It just says the location isn't found, which can happen if there are no permissions to read/write to the location.
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Nov 2, 2010
My app creates a puzzle grid using table layout, tablerows and textviews. I want a user to be able to save this grid to the SD card so that it can be printed or copied or loaded onto another device.
How do you save a view so that when it's printed it will look like it does on the android screen?
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Mar 18, 2009
I am using camera to capture snapshots. But i am unable to view taken pictures location. I am also unable to browse sdcard directory using DDMS in eclipse.
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Jun 17, 2010
i have to change the name of a jpg file , for that i have written the following code sdcard = Environment.get External StorageDirectory(); from = new File(sdcard,image Path. sub string ( 8). toString()); to = new File(sdcard, "/DCIM/RoseVille_"+Info.getText() +"_"+Amount.getText () +"_"+timeStampFormat.format(n ew Date())+".jpg");
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Jun 8, 2012
I have a png file in my res/drawable-ldpi folder. I'm working in Eclipse with the emulator, but I've tried this on my 2.2.1 Android phone and I get the same behavior. I have an ImageView and I want to set the src programatically, based on a database call. If I just put
Code:
src="@drawable.norusdpyr"
in the Activity's XML file, the file displays fine. BUT, if I put
Code:
String imageresource = "R.drawable." + parsedData[4].toString();
chart.setImageURI(Uri.parse(imageresource));
where parsedData[4].toString() = "nor_usdpyr" I don't see anything. I've also tried
Code:
String imageresource = "android.resource://" + getPackageName() + "/R.drawable." + parsedData[4].toString();
chart.setImageURI(Uri.parse(imageresource));
and
Code:
InputStream is = getClass().getResourceAsStream("/drawable/" + parsedData[4].toString());
chart.setImageDrawable(Drawable.createFromStream(is, ""));
and
Code:
String imageresource = "R.drawable." + parsedData[4].toString();
File file = new File(imageresource);
chart.setImageDrawable(Drawable.createFromPath(file.getAbsolutePath()));
and
Code:
Context context = getApplicationContext();
int ResID = context.getResources().getIdentifier(imageresource, "drawable", "com.KnitCard.project");
chart.setImageResource(ResID);
finally,
Code:
chart.setImageURI(Uri.parse("android.resource://" + getPackageName() + "/R.drawable.nor_usdpyr"));
doesn't work.
None of these work. What am I doing wrong?
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Mar 29, 2009
Eldev LLC is looking for android developer familiar with google image search API to write a new application.
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May 26, 2010
I have an image and text files in the (SDCard) android emulator. Emulator shows the image files in the gallery. How and where can we view the available text file in the android emulator?
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Sep 29, 2010
File is present in sdcard/image.jpg I would like to create my own application (activity). On a button press, the image stored in the sdcard needs to be displayed using the built-in image viewer. On pressing the back button from the Image viewer, it should go back to my running application.
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Aug 25, 2010
I had created a view and wanted to store it as a image in the sdcard of the emulator how can i do this?
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May 5, 2010
I have an activity that uses VideoView and MediaController. I have a .mp4 file. When I put the file in res/raw folder, I can play the video using Uri.parse("android.resource://<package>/" + R.raw.id_video)
However, when I put the same file in the filesystem, it plays properly. I use videoView.setVideoPath("/sdcard/myfile.mp4");
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Jul 26, 2010
I have a large bitmap (say 3888x2592) in a file. Now, I want to resize that bitmap to 800x533 and save it to another file.I normally would scale the bitmap by calling Bitmap.createBitmap method but it needs a source bitmap as the first argument, which I can't provide because loading the original image into a Bitmap object would of course exceed the memory (see here, for example).Is there a way to read a large image file with 10MP or more and save it to a new image file, resized to a specific new width and height, without getting an OutOfMemory exception?I also tried BitmapFactory.decodeFile(file, options) and setting the Options.outHeight and Options.outWidth values manually to 800 and 533, but it doesn't work that way.
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Jul 21, 2010
I use http://stackoverflow.com/questions/541966/android-how-do-i-do-a-lazy-load-of-images-in-listview/3068012#3068012 to load images in a ListView and a GridView. It works but the images are loaded form bpttom to top. How to fix that?
Bonus Question: Can I use a loading animation in a image view while the real image is loaded? Right now it's just a default image.
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Aug 3, 2010
I am loading image url on to webview it fetching the image as well but I need to display it in resizeable it means the height to be reduced, help me to get reduced height of the image.
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Jan 23, 2009
Is it possible to build a GridView object in XML with 3 columns and 4 rows of Image buttons? It doesn't seem to have similar containment relationship like LinearLayout or RelativeLayout viewgroups.
I want to do this entirely in an xml layout file. When I put ImageButton xml tags inside a GridView xml body, The layout panel in eclipse is throwing an exception: UnsupportedOperationException:addView(View, LayoutParams) is not supported in AdapterView.
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May 1, 2010
I'm using the stock Android 2.1 gallery to view images. I have a large JPG image (approx 7000x7000 pixels) of bicycle route map for my city. I tried zooming and scrolling with the gallery image viewer, but it cannot zoom in close enough to read the map detail.
Is there a better image viewer app out there that is good for zooming and scrolling large JPG images?
I would like to use Google maps, but the bicycle route mode still does not work in the Android app.
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Nov 19, 2010
I have parsed the xml file. now aim is to display contents using list view as dynamically..
How it is possible?
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Oct 22, 2010
How can I see the contents of SD card of my phone on the DDMS, when I connect to the computer? I want to pull the pictures out of my phone.
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Jul 20, 2010
How to delete sd card contents?
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Nov 24, 2010
If there is a image on my phone that I want to send up to a server thats 1mb or higher I want to take that image and shrink it to a smaller size without messing with original image in anyway. I know how to get a from the phone and I also know how to send it up to a server, I just need to know how to make the image smaller because large files higher than 1mb are giving me issues.
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Aug 26, 2010
I have a list which shows data from a database using a cursor adapter. Using Menu option I am updating my database (inserting more rows deleting existing rows). When Menu operation completes, I want contents of list should show updated contents.
I have tried using cursor.requery(); (or explicitly querying cursor again) and using adapter.notifydatasetchanged(), but with this list of contents are not updated.
How can I refresh the contents of the list.
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Jan 19, 2010
How do I save the contents of an array to a file and then read it again later? I have a small amount of data that will need to be stored and since I have no idea where to start on using a SQLite database, I think this will work a lot better.
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