CODEWITHSUNDEEP
androidcachingbitmapfileinputstreamfileoutputstream
anonymous developer
anonymous developer

Reputation: 406

Error writing and reading bitmap to and from temporary cache file android?

Here is my code when I am writing to the file

Bitmap bitmap;
InputStream is;

try
{
    is = (InputStream) new URL(myUrl).getContent();
    bitmap = BitmapFactory.decodeStream(is);
    is.close();

     //program crashing here
    File f = File.createTempFile(myUrl,null,MyApplication.getAppContext().getCacheDir());
    FileOutputStream fos = new FileOutputStream(f);
    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
    fos.flush();
    fos.close();
}
catch(Exception e)
{
    bitmap = null;
}

And here is my code reading from the same file

Bitmap bitmap;
try
{
    File f = new File(myUrl);
    FileInputStream fis = new FileInputStream(f);
    BufferedInputStream bis = new BufferedInputStream(fis);
    byte[] bitmapArr = new byte[bis.available()];
    bis.read(bitmapArr);
    bitmap = BitmapFactory.decodeByteArray(bitmapArr, 0, bitmapArr.length);
    bis.close();
    fis.close();
}
catch(Exception e)
{
    bitmap = null;
}

The program is crashing at the creation of the temp file in the first chunk of code.

EDIT: I am getting a libcore.io.ErrnoException

Upvotes: 1

Views: 1593

Answers (1)

anonymous developer
anonymous developer

Reputation: 406

UPDATE: I found the problem and fixed it, for anyone interested see below.

I changed it to use the openFileOutput(String, int), and openFileInput(String) methods, I should have done it this way right from the beginning.

The following is working code to decode an input stream from a url containing an image into a bitmap, compress the bitmap and store it into a file, and to retrieve said bitmap from that file later.

Bitmap bitmap;
InputStream is;

try
{
    is = (InputStream) new URL(myUrl).getContent();
    bitmap = BitmapFactory.decodeStream(is);
    is.close();

    String filename = "file"
    FileOutputStream fos = this.openFileOutput(filename, Context.MODE_PRIVATE);
    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
    fos.close();
}
catch(Exception e)
{
    bitmap = null;
}

and 

Bitmap bitmap;

try
{
    String filename = "file";
    FileInputStream fis = this.openFileInput(filename);
    bitmap = BitmapFactory.decodeStream(fis);
    fis.close();
}
catch(Exception e)
{
    bitmap = null;
}

Upvotes: 1

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