Question

I have been trying to develop an Android app which lets the user take a picture and then send the image over HTTP. I am using the native camera.

After the user takes the picture and hits the save button, I get a black screen while the app sends the info and waits for a response. I would rather display a progressdialog but no matter what I tried, the black screen stays there and the progressdialog can only be seen after getting the response and hitting the back button. I have tried using setContentView() to no avail. The threads are for HTTP request.

Here is the code for the camera start and finish:

protected void startCameraActivity()
{

    File file = new File( _path );
    Uri out = Uri.fromFile( file );

    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE );
    intent.putExtra( MediaStore.EXTRA_OUTPUT, out );

    startActivityForResult( intent, 0 );
}

protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{   
    switch( resultCode )
    {
    case 0:
        break;

    case -1:
        m_ProgressDialog = ProgressDialog.show(MainActivity.this, "Please wait...", "Uploading data ...", true, true);
        onPhoto();
        break;
    }
}

protected void onPhoto()
{
    taken = true;


    PipedOutputStream pos = new PipedOutputStream();
    PipedInputStream pis = null;
    try {
        pis = new PipedInputStream(pos);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    Sender sender = new Sender(pos);
    Receiver receiver = new Receiver(pis);
    sender.start();
    receiver.start();
    try {
        sender.join();
        receiver.join();
        try {
            field.setText(receiver.getIn().readUTF());
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    try {
        pis.close();
        pos.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}

Answer 1

Check out this link: How can I use an Async Task to upload a file to the server?

In onPreExecute() you can define what you want to show while the image is processing (a progress bar, a spinner…).