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Check group membership

Use isJoinGroup to determine whether the current signed-in user has joined a group.

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isJoinGroup() checks whether the current signed-in user has joined the target group. Its parameter is groupID.

OpenIMClient.getInstance().groupManager.isJoinGroup(groupID, new OnBase<Boolean>() {
    @Override public void onSuccess(Boolean joined) { /* joined indicates whether the user is a member. */ }
    @Override public void onError(int code, String error) { /* code and error describe the failure. */ }
});