Android - downloading image from web, saving to internal memory in location private to app, displaying for list item

Question

What I\'m trying to do is this: I want my application to download an image from the Internet and save it to the phone\'s internal memory in a location that is private to the app

Answer 1

void  writeToFile(Bitmap _bitmapScaled)
    {
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        _bitmapScaled.compress(Bitmap.CompressFormat.PNG, 40, bytes);
        try{
        File f;
        //you can create a new file name "test.jpg" in sdcard folder.
        if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))
            f =new File(android.os.Environment.getExternalStorageDirectory(),"FamilyLocator/userimages/"+imageName);
        else
         f = new File(Environment.getDataDirectory(),"FamilyLocator/userimages/"+imageName);

        f.createNewFile();
        //write the bytes in file
        FileOutputStream fo = new FileOutputStream(f);
        fo.write(bytes.toByteArray());
        // remember close de FileOutput
        fo.close();
        }catch(Exception e){e.printStackTrace();}
    }

Answer 2

it seems that some code is left out, I re-wrote it like this:

ProductUtils.java

public static String productLookup(String productID, Context c) throws IOException {

    URL url = new URL("http://www.samplewebsite.com/" + productID + ".jpg");

    InputStream input = null;
    FileOutputStream output = null;

    try {
        String outputName = productID + "-thumbnail.jpg";

        input = url.openConnection().getInputStream();
        output = c.openFileOutput(outputName, Context.MODE_PRIVATE);

        int read;
        byte[] data = new byte[1024];
        while ((read = input.read(data)) != -1)
            output.write(data, 0, read);

        return outputName;

    } finally {
        if (output != null)
            output.close();
        if (input != null)
            input.close();
    }
}

Answer 3

Looks like simply referring to the image file name when trying to read it was not enough, and I had to call getFilesDir() to get the path of the file storage. Below is the code I used:

String path = context.getFilesDir().toString();
String fileName = cursor.getString(cursor.getColumnIndex(DbAdapter.KEY_PRODUCT_ID));

if (fileName != null && !fileName.equals("")) {
    Bitmap bMap = BitmapFactory.decodeFile(path + "/" + fileName);
    if (bMap != null) {
        thumbnail.setImageBitmap(bMap);
    }
}