[android] Set handshake link when received via sharing intent or link click

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/AddContactViewModel.java

@@ -68,6 +68,11 @@ public class AddContactViewModel extends AndroidViewModel {
 		return handshakeLink;
 	}
 
+	@Nullable
+	String getRemoteHandshakeLink() {
+		return remoteHandshakeLink;
+	}
+
 	void setRemoteHandshakeLink(String link) {
 		remoteHandshakeLink = link;
 	}

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/LinkExchangeFragment.java

@@ -72,6 +72,10 @@ public class LinkExchangeFragment extends BaseFragment {
 
 		linkInputLayout = v.findViewById(R.id.linkInputLayout);
 		linkInput = v.findViewById(R.id.linkInput);
+		if (viewModel.getRemoteHandshakeLink() != null) {
+			// This can happen if the link was set via an incoming Intent
+			linkInput.setText(viewModel.getRemoteHandshakeLink());
+		}
 
 		clipboard = (ClipboardManager) requireNonNull(
 				getContext().getSystemService(CLIPBOARD_SERVICE));