Background Application unable to display UI when receive push notification - blackberry

Question

Here is my full push notification listener.
public class MyApp extends UiApplication {
public static void main(String[] args) {
PushAgent pa = new PushAgent();
pa.enterEventDispatcher();
}
}
Is this class extended correctly?
public class PushAgent extends Application {
private static final String PUSH_PORT = "32023";
private static final String BPAS_URL = "http://pushapi.eval.blackberry.com";
private static final String APP_ID = "2727-c55087eR3001rr475448i013212a56shss2";
private static final String CONNECTION_SUFFIX = ";deviceside=false;ConnectionType=mds-public";
public static final long ID = 0x749cb23a75c60e2dL;
private MessageReadingThread messageReadingThread;
public PushAgent() {
if (!CoverageInfo.isCoverageSufficient(CoverageInfo.COVERAGE_BIS_B)) {
return;
}
if (DeviceInfo.isSimulator()) {
return;
}
messageReadingThread = new MessageReadingThread();
messageReadingThread.start();
registerBpas();
}
private static class MessageReadingThread extends Thread {
private boolean running;
private ServerSocketConnection socket;
private HttpServerConnection conn;
private InputStream inputStream;
private PushInputStream pushInputStream;
public MessageReadingThread() {
this.running = true;
}
public void run() {
String url = "http://:" + PUSH_PORT + CONNECTION_SUFFIX;
try {
socket = (ServerSocketConnection) Connector.open(url);
} catch (IOException ex) {
}
while (running) {
try {
Object o = socket.acceptAndOpen();
conn = (HttpServerConnection) o;
inputStream = conn.openInputStream();
pushInputStream = new MDSPushInputStream(conn, inputStream);
PushMessageReader.process(pushInputStream, conn);
} catch (Exception e) {
if (running) {
running = false;
}
} finally {
close(conn, pushInputStream, null);
}
}
}
}
public static void close(Connection conn, InputStream is, OutputStream os) {
if (os != null) {
try {
os.close();
} catch (IOException e) {
}
}
if (is != null) {
try {
is.close();
} catch (IOException e) {
}
}
if (conn != null) {
try {
conn.close();
} catch (IOException e) {
}
}
}
private String formRegisterRequest(String bpasUrl, String appId,
String token) {
StringBuffer sb = new StringBuffer(bpasUrl);
sb.append("/mss/PD_subReg?");
sb.append("serviceid=").append(appId);
sb.append("&osversion=").append(DeviceInfo.getSoftwareVersion());
sb.append("&model=").append(DeviceInfo.getDeviceName());
if (token != null && token.length() > 0) {
sb.append("&").append(token);
}
return sb.toString();
}
private void registerBpas() {
final String registerUrl = formRegisterRequest(BPAS_URL, APP_ID, null)
+ CONNECTION_SUFFIX;
Object theSource = new Object() {
public String toString() {
return "Oriental Daily";
}
};
NotificationsManager.registerSource(ID, theSource,
NotificationsConstants.IMPORTANT);
new Thread() {
public void run() {
try {
HttpConnection httpConnection = (HttpConnection) Connector
.open(registerUrl);
InputStream is = httpConnection.openInputStream();
String response = new String(IOUtilities.streamToBytes(is));
close(httpConnection, is, null);
String nextUrl = formRegisterRequest(BPAS_URL, APP_ID,
response) + CONNECTION_SUFFIX;
HttpConnection nextHttpConnection = (HttpConnection) Connector
.open(nextUrl);
InputStream nextInputStream = nextHttpConnection
.openInputStream();
response = new String(
IOUtilities.streamToBytes(nextInputStream));
close(nextHttpConnection, is, null);
} catch (IOException e) {
}
}
}.start();
}
}
}
This is the process;
public class PushMessageReader {
private static final String MESSAGE_ID_HEADER = "Push-Message-ID";
private static final String MESSAGE_TYPE_TEXT = "text";
private static final String MESSAGE_TYPE_IMAGE = "image";
private static final int MESSAGE_ID_HISTORY_LENGTH = 10;
private static String[] messageIdHistory = new String[MESSAGE_ID_HISTORY_LENGTH];
private static byte historyIndex;
private static byte[] buffer = new byte[15 * 1024];
private static byte[] imageBuffer = new byte[10 * 1024];
public static final long ID = 0x749cb23a75c60e2dL;
public static Bitmap popup = Bitmap.getBitmapResource("icon_24.png");
private PushMessageReader() {
}
public static void process(PushInputStream pis, Connection conn) {
try {
HttpServerConnection httpConn;
if (conn instanceof HttpServerConnection) {
httpConn = (HttpServerConnection) conn;
} else {
throw new IllegalArgumentException(
"Can not process non-http pushes, expected HttpServerConnection but have "
+ conn.getClass().getName());
}
String msgId = httpConn.getHeaderField(MESSAGE_ID_HEADER);
String msgType = httpConn.getType();
String encoding = httpConn.getEncoding();
if (!alreadyReceived(msgId)) {
byte[] binaryData;
if (msgId == null) {
msgId = String.valueOf(System.currentTimeMillis());
}
if (msgType.indexOf(MESSAGE_TYPE_TEXT) >= 0) {
int size = pis.read(buffer);
binaryData = new byte[size];
System.arraycopy(buffer, 0, binaryData, 0, size);
NotificationsManager.triggerImmediateEvent(ID, 0, null,
null);
processTextMessage(buffer);
} else if (msgType.indexOf(MESSAGE_TYPE_IMAGE) >= 0) {
int size = pis.read(buffer);
if (encoding != null && encoding.equalsIgnoreCase("base64")) {
Base64InputStream bis = new Base64InputStream(
new ByteArrayInputStream(buffer, 0, size));
size = bis.read(imageBuffer);
}
binaryData = new byte[size];
System.arraycopy(buffer, 0, binaryData, 0, size);
}
}
pis.accept();
} catch (Exception e) {
} finally {
PushAgent.close(conn, pis, null);
}
}
private static boolean alreadyReceived(String id) {
if (id == null) {
return false;
}
if (Arrays.contains(messageIdHistory, id)) {
return true;
}
messageIdHistory[historyIndex++] = id;
if (historyIndex >= MESSAGE_ID_HISTORY_LENGTH) {
historyIndex = 0;
}
return false;
}
private static void processTextMessage(final byte[] data) {
synchronized (Application.getEventLock()) {
UiEngine ui = Ui.getUiEngine();
GlobalDialog screen = new GlobalDialog("New Notification",
"Article ID : " + new String(data), new String(data));
ui.pushGlobalScreen(screen, 1, UiEngine.GLOBAL_QUEUE);
}
}
static class GlobalDialog extends PopupScreen implements
FieldChangeListener {
ButtonField mOKButton = new ButtonField("OK", ButtonField.CONSUME_CLICK
| FIELD_HCENTER);
String data = "";
public GlobalDialog(String title, String text, String data) {
super(new VerticalFieldManager());
this.data = data;
add(new LabelField(title));
add(new SeparatorField(SeparatorField.LINE_HORIZONTAL));
add(new LabelField(text, DrawStyle.HCENTER));
mOKButton.setChangeListener(this);
add(mOKButton);
}
public void fieldChanged(Field field, int context) {
if (mOKButton == field) {
try {
ApplicationManager.getApplicationManager().launch(
"OrientalDailyBB");
ApplicationManager.getApplicationManager().postGlobalEvent(
ID, 0, 0, data, null);
ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry
.getInstance();
reg.unregister();
close();
} catch (ApplicationManagerException e) {
}
}
}
}
}
In this project, I checked Auto-run on startup so that this background app listener will run all the time and set the start tier to 7 in the BB App Descriptor.
However, it cannot display the popup Dialog, but I can see the device has received the push notification.
After the dialog popup and user click OK will start the OrientalDailyBB project and display the particular MainScreen.
FYI: The listener priority is higher than the OrientalDailyBB project because it is a background application. So when I install OrientalDailyBB, it will install this listener too. It happened because this listener is not in the OrientalDailyBB project folder, but is in a different folder. I did separate them to avoid the background application being terminated when the user quits from OrientalDailyBB.

Answer 1

I believe that this is a threading problem. pushGlobalScreen is a message you could try to use with invokeLater.
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
ui.pushGlobalScreen(screen, 1, UiEngine.GLOBAL_QUEUE);
}
});
you could try to push the application to the foreground too.