[Interest] [ Android ] QtActivity connect startActivityForResult to onActivityResult to callback C++ code?

[Ben Lau]

For passing data from Java to C++,  you may declare a native method in Java
and register via JNI in C++ side.

Example :

Declare native method
qtandroidexamplecode/QtRunner.java at master · benlau/qtandroidexamplecode
<https://github.com/benlau/qtandroidexamplecode/blob/master/qtandroidrunner/android/src/com/github/qt/QtRunner.java#L36>

Registration:
qtandroidexamplecode/qtandroidrunner.cpp at master ·
benlau/qtandroidexamplecode
<https://github.com/benlau/qtandroidexamplecode/blob/master/qtandroidrunner/qtandroidrunner.cpp#L23>

That is the standard way. However, in case you have problem in coding with
JNI, you may also consider an alternative method with using 3rd party
library:

Communication between C++ and Java without using JNI | Qt Forum
<http://forum.qt.io/topic/56510/communication-between-c-and-java-without-using-jni>



On 22 July 2015 at 00:35, Edward Sutton <edward.sutton at subsite.com> wrote:

>  I have an activity working that I use to send a firmware update file
> from Android to a Bluetooth device using Android’s support for Object Push
> File “com.android.bluetooth.opp.BluetoothOppLauncherActivity"
>
>  Can QtActivity receive a onActivityResult and connect it back to the C++
> code somehow?  It does not allow me to override it.
>
>  http://developer.android.com/training/basics/intents/result.html
>
>  @Override
> protected void onActivityResult(int requestCode, int resultCode, Intent data) {
>     // Check which request we're responding to
>     if (requestCode == PICK_CONTACT_REQUEST) {
>         // Make sure the request was successful
>         if (resultCode == RESULT_OK) {
>             // The user picked a contact.
>             // The Intent's data Uri identifies which contact was selected.
>
>             // Do something with the contact here (bigger example below)
>         }
>     }
> }
>
>
>
>
>  public class TsrActivity extends QtActivity
>
> {
>
>     private static TsrActivity m_instance;
>
>
>     public TsrActivity()
>
>     {
>
>         m_instance = this;
>
>     }
>
>
>      /// Sends firmware file via OBEX OPP
>
>     ///
>
>     /// \remarks user must select matching "TK_0003" from intent screen
>
>     ///
>
>     /// \param[in] absolutePathToFile path to firmware files TK_11.tsu
>
>     /// \param[in] address email body
>
>     public static void sendFile(String absolutePathToFile, String address) {
>
>             try {
>
>                     System.out.println("dbg: sendFile");
>
>                     System.out.println("dbg: absolutePathToFile:" + absolutePathToFile);
>
>                     System.out.println("dbg: address:" + address);
>
>
>                     String intentAction = android.content.Intent.ACTION_SEND;
>
>                     final Intent intent = new Intent(intentAction);
>
>                     intent.setType("application/x-tar");
>
>                     intent.setClassName("com.android.bluetooth",
>
>                                         "com.android.bluetooth.opp.BluetoothOppLauncherActivity");
>
>
>                     Uri uriFile = Uri.fromFile(new File(absolutePathToFile));
>
>                     intent.putExtra(Intent.EXTRA_STREAM, uriFile);
>
>
>                     // title does not display on intent?
>
>                     String title = "Update software";
>
>                     m_instance.startActivity(Intent.createChooser(intent, title));
>
>
>             } catch (Throwable t) {
>
>                 System.out.println("dbg: sendFile.exception");
>
>
>                     Toast.makeText(m_instance, "Request failed clickbutton: " + t.toString(),
>
>                                     Toast.LENGTH_LONG).show();
>
>             }
>
>     }
>
>
>
> -Ed
>
>
>
>
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