Android :: How To Read Pixel Data?
Jun 24, 2010
File file = new File(fileName);
Iterator iter = ImageIO.getImageReadersByFormatName("Reader");
ImageReader reader = (ImageReader) iter.next();
ImageReadParam param= reader.getDefaultReadParam();
ImageInputStream iis = ImageIO.createImageInputStream(myFile);
reader.setInput(iis, false);
BufferedImage myJpegImage = reader.read(0, param);
How can i write equivalent codes for above codes on Android? Are there any hints how to read pixel data?
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Nov 22, 2010
I have some png files that I am applying a color to. The color changes depending on a user selection. I change the color via 3 RGB values set from another method. The png files are a random shape with full transparency outside the shape. I don't want to modify the transparency, only the RGB value. Currently, I'm setting the RGB values pixel by pixel (see code below).I've come to realize this is incredibly slow and possibly just not efficient enough do in an application. Is there a better way I could do this? Here is what I am currently doing. You can see that the pixel array is enormous for an image that takes up a decent part of the screen
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May 8, 2013
What I am needing is a method to get grayscale pixel data from an image or preview. I am not interested in saving the picture as a jpeg etc, just need the grayscale data.
I am aiming at API 10 (as this is the device available for testing).
On top of this, I am not having any luck getting the camera to work on the Eclipse emulator.
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Mar 29, 2009
I am saving an image using openFileOutput and now i want to use this image in my java script file.
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Jul 2, 2010
I would like to put the following tag in the manifest file. code...
The question is, how i can read the value of the meta-data tag (myname)?
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Feb 24, 2010
Is there anyway to read data from an attachment through the USB port on an Android device? In particular, an EKG. Most the work can be done by the hardware of the device to simplify the output to a single number, a voltage reading. If its not possible, what about modifying an accessory that can already communicate with an android device? Thinking of devices that attach to android phones, what about sending the data as an audio signal to be read as the microphone from a headset and then analyzing the audio signal to convert it to a number that can be used to display a value. how to make this work?
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Oct 27, 2009
I want to read out the binary content of the .apk packages installed in /data/app. Not only the package information, but the content of the package itselt. How can I do that.
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Jun 10, 2010
I want to read MMS data i have seen the part table in the mmssms.db where the mms entries stored i am using cursor to and i want to know the appropriate URI like i am using "content://mms-sms/conversations" and the Column names of "Address"(Sent to), "Text" or "Subject" and "Data" column name of image.
i have seen the schema of mmssms.db and Their Column of part Table.
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May 24, 2010
Is there a permission to allow one app to read the (private) data/data//files/ files of another application? If not, how do backup programs like MyBackup work?
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Aug 26, 2010
i am new in android how read the data from server using intent.
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Mar 13, 2010
how to read/write log data into a text file in android that file should be res folder.
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Aug 17, 2010
I've noticed lately that some app recommender programs seem to get data off the android market. I'm wondering how I could retrieve information, such as screen shots, description, developer, number of downloads, rating, etc...
I've done many searches and I haven't found any solutions. It would be nice to be able to use that info to be able to see a rating for an app inside an app chooser, for example. Or perhaps be able to track changes and rating over time and version history, etc...
Is there an API to access that information? Is there a way to parse the data from a website? Or is there a complicated hack involved?
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Apr 7, 2010
Is it possible to read data from vard in android 1.6? If yes then how can it is possible.
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Jan 4, 2010
I m using Android 1.5 my data directory does'nt have the read/write permissions
System.out.println("DAta can write??--->"+Environment.getDataDirectory().canWrite());
System.out.println("DAta can read??--->"+Environment.getDataDirectory().canRead());
So please suggest me how to provide permission for the data directory.
What m trying to do is to create a file and add some content to it iin the Data storage of the emulator like as below
private void writeToSDCard() {
try {
File lroot = Environment.getDataDirectory();
if (lroot.canWrite()){
File lfile = new File(lroot, "samplefile.txt");
FileWriter lfilewriter = new FileWriter(lfile);
BufferedWriter lout = new BufferedWriter(lfilewriter);
lout.write("XXXXXXXXXXXXXXXXXX");
lout.close();
}
} catch (IOException e) {
Log.e(m_cTAG, "Could not write file " + e.getMessage());
}
}
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Oct 27, 2010
Is there a way to do it within an app without downloading the file first? Somehow stream the text content?
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May 25, 2010
I am new to android.I need to read text file from SDcard and display that text file.Is there any possibility to view a text file directly in android. or else how to read and display the text file ?
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Jan 5, 2012
I want to read SDCard data from android mobiles using eclipse(programmatically).
For that i want to open SDCard in binary mode,So that i can read SDCard sector by sector.
the problem is when i am debuging a programm using JNI in c++ its not going to take access in binary mode..
How to open a sdcard in binary mode using eclipse or java programming.
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Jan 9, 2014
With android 4.1 on my Galaxy S3 I could select an image in the gallery, tap the menu and choose settings where I could find the exif data, but since upgrading to 4.3 the settings option is missing. So how do I now pull up the exif, notably the gps coordinates, on the phone?
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Aug 17, 2010
I want to collect phone numbers from phone with last-name and first-name (for sorting purpose). How can I achieve that in the simplest way? Is it possible with one query? And I need both versions: for pre 2.0 SDK and later to be compatibile.
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Aug 10, 2010
In my app i need to read the data at a content provider before the system actually initializes. Probably what i understand is that a boot complete intent would launch a homescreen activity.Exactly before the system initialized i want to see the data provided by the content provider and use it.
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Nov 17, 2010
Android documents starting the email intent for sending emails with Intent.ACTION_SEND. Is there an intent which directs the user to reading his email, or which launches the default email application? The application that launches the "read mail" intent would get no access to the email data.
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May 31, 2010
I have the calendar.ics file. I have to read that file from my application and transfer the data in to Google calendar in android. I am new to android. I need some help to do this.
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Sep 25, 2009
Sometimes in LogCat I'll see Wrote stack trace to '/data/anr/traces.txt'
But when using the DDMS perspective, "File Explorer" View, I can't see anything in the "data" directory, I'm assuming because permission denied. Is there a way (short of rooting my ion device) to read what's in that text file?
Is there perhaps an android app for developers that will show the contents of the file? It would seem there would have to be some way of reading the file without rooting the device, otherwise why does the o.s. write it out? How can I read this file?
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May 4, 2010
I am developing an application that needs to access data on the sd card. When I run on my development device (an odroid with Android 2.1) I have root access and can construct the path using:
CODE:..........................
However, when I install this on a phone (2.1) where I do not have root access I get files == null. I assume this is because I do not have the right permissions to read the data from the sd card. I also get files == null when just trying to list files on /sdcard. So the same applies without my constructed path.
Also, this app is not intended to be distributed through the app store and is needs to use data copied separately to the sd card so this is a real use-case. It is too much data to put in res/raw (I have tried, it did not work).
I have also tried adding: <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
To the manifest, even though I only want to read the sd card, but it did not help. I have not found a permission type for reading the storage.
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Nov 3, 2010
I want to read data from database and displayed it in table layout form. table will contain n rows and 2 columns. But row size is not fixed then how to show them in table layout format?
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Jul 24, 2010
I need to store data to use in my android program. Here are the details about the data: There will be one table. Each "row" of data will have a unique INT identifier. Other then that field, there will be four other INT fields and a text field. The string field will probably be a 2 or 3 sentences long. Each of the 4 INT fields will correspond to the ID of other rows.
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Jun 10, 2010
How do I access my sd card from my evo to see what is saved on there? Or must I connect it to the computer to view what's on the sd card?
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Aug 6, 2011
I have bought a credit card reader for my nexus one, like Square use. This is a device that plugs into headset jack and you swipe the credit card for this or any card with magnetic striper.I wanna know if there is a way to read the information it sent by headset jack?
This is some new for me but I need this device to read identification ID.Tthere is any API that can be connected to headeset jack ?
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Apr 28, 2014
I wanna to read data from Internet , this is my code :
Code:
public class Main extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView tv=(TextView) findViewById(R.id.textView1);
[Code] ....
What It doesn't get anything from internet ?
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Jul 14, 2010
I'm not even concerned with the camera per se. I want at the closest thing to the display screen. Meaning: it could even be the desktop the user is looking at, completw w/ the background and the icons she moves back and forth.
Let's say, at time t=1 sec, the app goes to pixel (78, 300) on that display and obtains its value. What may be at (78, 300) could be a portion of the icon or some speck of tree leaf on the photo being used as desktop background.
I'm familiar with BitmapFactory.decodeFile() for getting at the pixel contents of a file. But what about the display?
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