How To Access Gmail Attachment Data In My App

I have an app that uses a specifically created binary (.gcsb) file type. These files are kept in a folder on the sdcard. At the moment they are moved on and off using ES file explo

Solution 1:

Found out how to do it. Hopefully this may help someone else. Party mine, partly from other posts. It is aiming to handle .gcsb file attachments.

The intent-filter is

<intent-filter><actionandroid:name="android.intent.action.VIEW" /><categoryandroid:name="android.intent.category.DEFAULT" /><categoryandroid:name="android.intent.category.BROWSABLE" /><dataandroid:mimeType="application/octet-stream" /></intent-filter>

and the code in the activity onCreate() / onRestart() is

Intent intent = getIntent();
InputStream is = null;
FileOutputStream os = null;
String fullPath = null;

try {
    String action = intent.getAction();
    if (!Intent.ACTION_VIEW.equals(action)) {
        return;
    }

    Uri uri = intent.getData();
    String scheme = uri.getScheme();
    String name = null;

    if (scheme.equals("file")) {
        List<String> pathSegments = uri.getPathSegments();
        if (pathSegments.size() > 0) {
            name = pathSegments.get(pathSegments.size() - 1);
        }
    } elseif (scheme.equals("content")) {
        Cursor cursor = getContentResolver().query(uri, new String[] {
            MediaStore.MediaColumns.DISPLAY_NAME
        }, null, null, null);
        cursor.moveToFirst();
        int nameIndex = cursor.getColumnIndex(MediaStore.MediaColumns.DISPLAY_NAME);
        if (nameIndex >= 0) {
            name = cursor.getString(nameIndex);
        }
    } else {
        return;
    }

    if (name == null) {
        return;
    }

    int n = name.lastIndexOf(".");
    String fileName, fileExt;

    if (n == -1) {
        return;
    } else {
        fileName = name.substring(0, n);
        fileExt = name.substring(n);
        if (!fileExt.equals(".gcsb")) {
            return;
        }
    }

    fullPath = ""/* create full path to where the file is to go, including name/ext */;

    is = getContentResolver().openInputStream(uri);
    os = new FileOutputStream(fullPath);

    byte[] buffer = newbyte[4096];
    int count;
    while ((count = is.read(buffer)) > 0) {
        os.write(buffer, 0, count);
    }
    os.close();
    is.close();
} catch (Exception e) {
    if (is != null) {
        try {
            is.close();
        } catch (Exception e1) {
        }
    }
    if (os != null) {
        try {
            os.close();
        } catch (Exception e1) {
        }
    }
    if (fullPath != null) {
        File f = new File(fullPath);
        f.delete();
    }
}

It appears to work in the standard Android gmail and mail applications. The file name is obtained two different ways depending if 'download' (scheme file) or 'preview' (scheme content) was pressed in gmail.

Note that it is extremely important that the activity is not set to be single instance.

Solution 2:

nwm01223' answer is correct! A small addendum: His answer only works for ACTION_VIEW. if you add

Uri uri = null;
if(Intent.ACTION_VIEW.equals(action)){
    uri = intent.getData();
} elseif(Intent.ACTION_SEND.equals(action)){
    uri = (Uri) intent.getParcelableExtra(Intent.EXTRA_STREAM);
}

it will also work for ACTION_SEND