我在使用 Java 中的 MVVM 實現 Google 登錄時遇到問題。在這里，您將以正常方式看到來自 Google 的示例代碼：問題：在你的活動中：@Overridepublic void onCreate(Bundle savedInstanceState) {    /* Here is the Issue:     * Google Object is defined in View - Activity     * I would like to have Google Object defined in my ViewModel     */    GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN).requestEmail().build();    mGoogleSignInClient = GoogleSignIn.getClient(this, gso);}// when Google Button CLicked@Overridepublic void onClick(View v) { signIn(); }private void signIn() {    /* Here is the Issue:     * I have to get this process done in View Model     * so view will not reference any Google Object     */    Intent signInIntent = mGoogleSignInClient.getSignInIntent();    startActivityForResult(signInIntent, RC_SIGN_IN);}@Overridepublic void onActivityResult(int requestCode, int resultCode, Intent data) {    super.onActivityResult(requestCode, resultCode, data);    // Below will be processed in ViewModel    GoogleSignInClient.getSignInIntent(...);    if (requestCode == RC_SIGN_IN) {        Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);        handleSignInResult(task);    }}問題： *見評論所以我想出了下面的想法：在活動中：// when Google Button CLicked@Overridepublic void onClick(View v) { viewModel.loginGoogle(); }private void subscribeUi() {    // register startActivityForResult Event to ViewModel and set this activity as receiver...    // viewModel.startActivityForResultEvent.setEventReceiver(this Activity)    // How to do this?}@Overridepublic void onActivityResult(int requestCode, int resultCode, Intent data) {    // send the result to View Model    viewModel.onResultFromActivity(requestCode,resultCode,data);    // escallate to super    super.onActivityResult(requestCode, resultCode, data)}