I am developing an Android app. In my app, I am uploading multiple images to server using Retrofit network library. Before I uploading file I create a temporary file from bitmaps. Then delete them after uploaded.
photoFiles = new ArrayList<File>();
MultipartBody.Builder requestBodyBuilder = new MultipartBody.Builder().setType(MultipartBody.FORM);
int index = 0;
for(Bitmap bitmap: previewBitmaps)
{
File file = null;
try{
String fileName = String.valueOf(System.currentTimeMillis())+".jpeg";
file = new File(Environment.getExternalStorageDirectory(), fileName); // create temporary file start from here
if(file.exists())
{
file.delete();
}
OutputStream os = new BufferedOutputStream(new FileOutputStream(file));
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, os);
os.close();
photoFiles.add(file);
requestBodyBuilder.addFormDataPart("files",file.getName(), RequestBody.create(MediaType.parse("image/png"),file));
}
catch (Exception e)
{
Toast.makeText(getBaseContext(),e.getMessage(),Toast.LENGTH_SHORT).show();
}
index++;
}
//Upload process goes here and delete files back after upload
Using above code, all working fine. But the problem is I have to create temporary files. I do not want to create temporary files. What I want to do is I create array list of Uri string when I pick up the file. Then on file upload, I will convert them to file back and do the upload process.
photoFiles = new ArrayList<File>();
MultipartBody.Builder requestBodyBuilder = new MultipartBody.Builder().setType(MultipartBody.FORM);
int index = 0;
for(Bitmap bitmap: previewBitmaps)
{
File file = null;
try{
Uri uri = Uri.parse(photosUriStrings.get(index));
file = new File(getPathFromUri(uri));
Toast.makeText(getBaseContext(),getPathFromUri(uri),Toast.LENGTH_SHORT).show();
photoFiles.add(file);
requestBodyBuilder.addFormDataPart("files",file.getName(), RequestBody.create(MediaType.parse("image/png"),file));
}
catch (Exception e)
{
Toast.makeText(getBaseContext(),e.getMessage(),Toast.LENGTH_SHORT).show();
}
index++;
}
As you can see in the above, I am converting the URI string back to file and then upload it. But this time retrofit unable to upload the file. File is not null as well. So I am pretty sure the error is with converting uri string back to image file back because my old code above working fine. Why can I not do that? How can I successfully convert from URI to image file back please?
I found this
Convert file: Uri to File in Android
and
Create File from Uri type android
both not working.
I am not clear about your question but I think this may help you. This single line code will help you to convert URI to file and show in your view.
Picasso.with(getContext()).load("URI path").into(holder.imgID);
Related
I'm trying to convert an IOS App to Android. I have no experience in Android so it may be a silly question. Sorry for that:)
I've uploaded some json files into the "files" folder of the emulator by device file explorer. (not into the external storage)
But when reading them, FileNotFoundException is thrown. (Permission denied) The code I used for reading is as below;
try {
File file = new File(getApplicationContext().getFilesDir() + "/Data/Users/profile.json");
FileReader fileReader = new FileReader(file);
String contents = "";
int i;
while((i = fileReader.read())!= -1) {
char ch = (char)i;
contents += ch;
}
return contents;
} catch (IOException e) {
e.printStackTrace();
}
I've tried to form those files programmatically in the same directory under "files" folder, as below.
String string = "{}";
File file = new File(getApplicationContext().getFilesDir() + "/Data/Users");
file.mkdirs();
File file2 = new File(getApplicationContext().getFilesDir() + "/Data/Users/profile.json");
file2.createNewFile();
FileOutputStream fos = new FileOutputStream(file2);
fos.write(string.getBytes());
fos.close();
This time, I managed to read them successfully by using the above code. It seems uploading files by device file explorer leads to some permission problems. I couldn't find how to modify them. How can I fix this?
I've got a rather odd problem. I'm writing an Android application using the Xamarin framework, and I also have an iOS version of the same app also written in Xamarin. In the app the user can send photos and videos to their friends, and their friends may be on either iOS or Android. This all works fine, and videos taken on an iPhone can be played on an Android device and vice versa.
The problem I am having is when I try to programmatically save a video to the Android gallery, then that video is not able to be played in the gallery. It does appear that the video data it's self is actually copied, but the video is somehow not playable.
My videos are encoded to the mp4 format using the H.264 codec. I believe this is fully supported in Android, and like I said the videos play just fine when played via a VideoView in the app.
The code I am using to copy the videos to the gallery is below. Does anyone have any idea what I am doing wrong here?
public static void SaveVideoToGallery(Activity activity, String filePath) {
// get filename from path
int idx = filePath.LastIndexOf("/") + 1;
String name = filePath.Substring(idx, filePath.Length - idx);
// set in/out files
File inFile = new File(filePath);
File outDir = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryMovies);
File outFile = new File(outDir, name);
// Make sure the Pictures directory exists.
outDir.Mkdirs();
// save the file to disc
InputStream iStream = new FileInputStream(inFile);
OutputStream oStream = new FileOutputStream(outFile);
byte[]data = new byte[iStream.Available()];
iStream.Read();
oStream.Write(data);
iStream.Close();
oStream.Close();
// Tell the media scanner about the new file so that it is
// immediately available to the user.
MediaScannerConnection.ScanFile(
activity.ApplicationContext,
new String[] { outFile.ToString() },
null,
null);
}
NOTE: I know this is all in C#, but keep in mind that all the Xamarin framework does is provide an API to the native Android methods. Everything I am using is either Java or Android backed classes/functions.
Thanks!
Your issue is in this code snippet:
byte[]data = new byte[iStream.Available()];
iStream.Read();
oStream.Write(data);
There are a few issues here:
You never read the files contents into the data buffer; iStream.Read() will only read a single byte and return it as an integer.
new byte[iStream.Available()] will only allocate the amount of data bytes that are available to be read without blocking. It isn't the full file. See the docs on the available method.
oStream.Write(data) writes out a garbage block of data as nothing is ever read into it.
The end result is the outputted video file is just a block of empty data hence why the gallery cannot use it.
Fix it reading in the data from the file stream and then writing them into the output file:
int bytes = 0;
byte[] data = new byte[1024];
while ((bytes = iStream.Read(data)) != -1)
{
oStream.Write (data, 0, bytes);
}
Full sample:
public static void SaveVideoToGallery(Activity activity, String filePath) {
// get filename from path
int idx = filePath.LastIndexOf("/") + 1;
String name = filePath.Substring(idx, filePath.Length - idx);
// set in/out files
File inFile = new File(filePath);
File outDir = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryMovies);
File outFile = new File(outDir, name);
// Make sure the Pictures directory exists.
outDir.Mkdirs();
// save the file to disc
InputStream iStream = new FileInputStream(inFile);
OutputStream oStream = new FileOutputStream(outFile);
int bytes = 0;
byte[] data = new byte[1024];
while ((bytes = iStream.Read(data)) != -1)
{
oStream.Write (data, 0, bytes);
}
iStream.Close();
oStream.Close();
// Tell the media scanner about the new file so that it is
// immediately available to the user.
MediaScannerConnection.ScanFile(
activity.ApplicationContext,
new String[] { outFile.ToString() },
null,
null);
}
I'm trying to share an image in an app I have made that downloads an Image and writes it to a file. But any time I try to share it, it says can't upload file or just does nothing. It's not coming up in the logcat so I'm kinda stuck for ideas on how to fix it.
The image that is downloaded is displayed in an image view like this
iView.setImageBitmap(im);
String path = ContentFromURL.Storage + "/temp.jpg";
File temp = new File(path);
uri = Uri.fromFile(temp);
iView.setImageURI(uri);
Asynch task to download file
HttpURLConnection connection;
try {
String url = params[0];
connection = (HttpURLConnection) new URL(url).openConnection();
connection.setRequestProperty("Accept-Charset","UTF-8");
connection.connect();
InputStream input = connection.getInputStream();
image = BitmapFactory.decodeStream(input);
File temp = new File(Storage,"temp.jpg");
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
FileOutputStream fo = new FileOutputStream(temp);
fo.write(bytes.toByteArray());
fo.close();
String path = temp.getAbsolutePath();
Log.d("Asynch", "image shuould exist");
SharePage.act.runOnUiThread(new Runnable()
{
public void run()
{
SharePage.setImage(image);
}
}
);
creating intent
twitterIntent = new Intent(Intent.ACTION_SEND);
twitterIntent.setClassName("com.twitter.android",packageName);
twitterIntent.setType("image/jpeg");
twitterIntent.putExtra(Intent.EXTRA_STREAM, uri);
startActivity(twitterIntent);
I know that I should use the built in android share thing but its not working either when I try to share the image
The problem was where I was trying to store the Image, I wanted to have it so that the user never saw the image and it was deleted when it wasn't needed anymore but the other apps didn't have access to the directory. So I have since moved it to the external storage directory.
this is a peace of code I've created to save a "library" of images to external storage in order to use that file in another application. This is a binary file which contains ArrayList of objects.
this is method what makes main job.
public void createLib()
{
File fl = new File("/mnt/sdcard/imgs");
File[] rawLib = fl.listFiles();
TextView text = (TextView) findViewById(R.id.txt1);
ArrayList<Block> myList = new ArrayList<Block>();
try{
for (int i = 0; i < rawLib.length; i++)
{
FileInputStream fis = new FileInputStream(rawLib[i]);
Bitmap bmp = BitmapFactory.decodeStream(fis);
Block tmpBlock = new Block();
tmpBlock.bmp = bmp;
tmpBlock.mozColor = findMidColor(bmp);
myList.add(tmpBlock);
}
}
catch(Exception exc)
{
exc.printStackTrace();
}
try
{
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/saved_images");
myDir.mkdirs();
File file = new File (myDir, "library.lib");
FileOutputStream fos = new FileOutputStream(file);
ObjectOutputStream save = new ObjectOutputStream(fos);
save.writeObject(myList);
save.close();
}
catch (Exception exc)
{
exc.printStackTrace();
}
here is the class I am working with
class Block
{
Bitmap bmp;
int mozColor;
}
findMidColor() is my method and it work pretty fine, so there is no problem with that.
When I pull created file from the emulators external storage, I see that file's size is about two and a half kilobytes, but original folder with images is about 2-3 megabytes.
Conslusion is that program saves only pointers to that bmp's. Is there any way to create bynary file of objects which contain images and ints, and reuse that file in another application like a ArrayList or any other array?
Yes Bitmap's data (pixels) are not saved in the Bitmap object. They live somewhere in the heap. You are now saving only references to wrong locations.
In your Block class instead of having a Bitmap object you can have a path to the Bitmap and a method that returns a Bitmap from that path.
class Block{
String bitmapPath;
int mozColor;
Bitmap bmp(){
//do something here to encode bitmap from file
}
}
You have to save the bitmap to a specific path and store it to Block.bitmapPath every time
You can easily find how to save a Bitmap to a File and retrieve from File
I have downloaded a file from HttpConnection using the FileOutputStream in android and now its being written in phone's internal memory on path as i found it in File Explorer
/data/data/com.example.packagename/files/123.ics
Now, I want to open & read the file content from phone's internal memory to UI. I tried to do it by using the FileInputStream, I have given just filename with extension to open it but I am not sure how to mention the file path for file in internal memory,as it forces the application to close.
Any suggestions?
This is what I am doing:
try
{
FileInputStream fileIn;
fileIn = openFileInput("123.ics");
InputStream in = null;
EditText Userid = (EditText) findViewById(R.id.user_id);
byte[] buffer = new byte[1024];
int len = 0;
while ( (len = in.read(buffer)) > 0 )
{
Userid.setText(fileIn.read(buffer, 0, len));
}
fileIn.close();
} catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
String filePath = context.getFilesDir().getAbsolutePath();//returns current directory.
File file = new File(filePath, fileName);
Similar post here
read file from phone memory
If the file is where you say it is, and your application is com.example.packagename, then calling openFileInput("123.ics"); will return you a FileInputStream on the file in question.
Or, call getFilesDir() to get a File object pointing to /data/data/com.example.packagename/files, and work from there.
I am using this code to open file in internal storage. i think i could help.
File str = new File("/data/data/com.xlabz.FlagTest/files/","hello_file.xml");