I am trying to integrate quickblox chat into an existing app that has been working well and already in the play store.
I am trying to implement this using the sample-chat code https://github.com/QuickBlox/quickblox-android-sdk/tree/master/sample-chat.
the original app API targetSdkVersion was 27 , I had to change it 28 as I got an error that necessitate the change and also migrate the app to androidX.
so in the code block below, the loadUsersFromQb() loads users with a tag "SampleTag" from the server. If a chat dialog exists the dialog is updated with the loaded users otherwise a ListView of the users is suppose to be presented where users can then be selected to be added to a chat group.
The code
private void loadUsersFromQb() {
List<String> tags = new ArrayList<>();
try {
tags.add("SampleTag");
}catch (Exception e)
{
// Toaster.shortToast(e.getMessage());
}
progressBar.setVisibility(View.VISIBLE);
QBUsers.getUsersByTags(tags, null).performAsync(new QBEntityCallback<ArrayList<QBUser>>() {
@Override
public void onSuccess(ArrayList<QBUser> usersByTags, Bundle params) {
users = usersByTags;
Toast.makeText(SelectUsersActivity.this, users.toString(), Toast.LENGTH_SHORT).show();
if (qbChatDialog != null) {
// update occupants list form server
getDialog();
} else {
updateUsersAdapter();
}
}
@Override
public void onError(QBResponseException e) {
Toast.makeText(SelectUsersActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
showErrorSnackbar(R.string.select_users_get_users_error, e,
new View.OnClickListener() {
@Override
public void onClick(View v) {
loadUsersFromQb();
}
});
progressBar.setVisibility(View.GONE);
}
});
}
however,
updateUsersAdapter()
results in
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources com.gill.XXX.CoreApp.getResources()' on a null object reference
the updateUsersAdapter() block looks like this
private void updateUsersAdapter() {
usersAdapter = new CheckboxUsersAdapter(this, users);
if (qbChatDialog != null) {
usersAdapter.addSelectedUsers(qbChatDialog.getOccupants());
}
usersListView.setAdapter(usersAdapter);
progressBar.setVisibility(View.GONE);
}
the usersListView was instantiated from the class fields like this
private ListView usersListView;
where ListView is an android API 28 widget.
The full Logcat of the exception is
2019-04-04 09:52:07.728 1200-1200/com.gill.XXX:error_activity E/CustomActivityOnCrash: The previous app process crashed. This is the stack trace of the crash:
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources com.gill.XXX.CoreApp.getResources()' on a null object reference
at com.gill.XXX.utils.UiUtils.getCircleColor(UiUtils.java:67)
at com.gill.XXX.utils.UiUtils.getColorCircleDrawable(UiUtils.java:40)
at com.gill.XXX.adapter.UsersAdapter.getView(UsersAdapter.java:74)
at com.gill.XXX.adapter.CheckboxUsersAdapter.getView(CheckboxUsersAdapter.java:41)
at android.widget.HeaderViewListAdapter.getView(HeaderViewListAdapter.java:220)
at android.widget.AbsListView.obtainView(AbsListView.java:2365)
at android.widget.ListView.makeAndAddView(ListView.java:2052)
at android.widget.ListView.fillDown(ListView.java:786)
at android.widget.ListView.fillFromTop(ListView.java:847)
at android.widget.ListView.layoutChildren(ListView.java:1826)
at android.widget.AbsListView.onLayout(AbsListView.java:2164)
at android.view.View.layout(View.java:20321)
at android.view.ViewGroup.layout(ViewGroup.java:6153)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1083)
at android.view.View.layout(View.java:20321)
at android.view.ViewGroup.layout(ViewGroup.java:6153)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:20321)
at android.view.ViewGroup.layout(ViewGroup.java:6153)
at androidx.appcompat.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:444)
at android.view.View.layout(View.java:20321)
at android.view.ViewGroup.layout(ViewGroup.java:6153)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:20321)
at android.view.ViewGroup.layout(ViewGroup.java:6153)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
at android.view.View.layout(View.java:20321)
at android.view.ViewGroup.layout(ViewGroup.java:6153)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:763)
at android.view.View.layout(View.java:20321)
at android.view.ViewGroup.layout(ViewGroup.java:6153)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2609)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2314)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1450)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7023)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:924)
at android.view.Choreographer.doCallbacks(Choreographer.java:732)
at android.view.Choreographer.doFrame(Choreographer.java:664)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:910)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6523)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:857)
The app crash on this method call. I have done a lot of search here on stackoverflow for similar question but I couldn't solve the problem still.
There is equally a suggestion somewhere https://issuetracker.google.com/issues/120750246 that might be because I am testing the app on a device with API level less than 28. as ClassNotFoundException also show up in the Logcat.
I have been on this for days, any help will be appreciated.
