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POAndroid app showing black screen while waiting HTTP response
 

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  1. POAndroid app showing black screen while waiting HTTP response
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    <p>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.</p> <p>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. </p> <p>Here is the code for the camera start and finish:</p> <pre><code>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(); } } </code></pre>
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    1. COYou should probably do your camera processing in an `AsyncTask`. Putting on the main thread means that your app won't move until that line of code is done.
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