Google 登录不会更改活动

Question

我刚刚在我的应用程序中实现了 Google 登录，但由于某种原因，当用户单击 google 登录按钮时，它没有激活 MainActivity。这是当用户单击登录按钮时激活的方法：private void signIn() {    Intent signInIntent = mGoogleSignInClient.getSignInIntent();    startActivityForResult(signInIntent, RC_SIGN_IN);}我必须在我想激活的地方添加活动。通常我将它添加到 Intent 中。但是当我这样做时：private void signIn() {    Intent signInIntent = mGoogleSignInClient.getSignInIntent();    signInIntent.setClass(this, MainActivity.class);     startActivityForResult(signInIntent, RC_SIGN_IN);}然后登录不再起作用。

Answer 1

正如您在此处看到的，在调用登录意图后，您必须覆盖 onActivityResult 方法来处理它：

@Override

public void onActivityResult(int requestCode, int resultCode, Intent data) {

  super.onActivityResult(requestCode, resultCode, data);

  // Result returned from launching the Intent from GoogleSignInClient.getSignInIntent(...);

  if (requestCode == RC_SIGN_IN) {

      // The Task returned from this call is always completed, no need to attach

      // a listener.

      Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);

      handleSignInResult(task);

  }

}

然后在您的 handleSignInResult 中，您可以检查登录是否成功，然后开始您的活动

private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {

  try {

      GoogleSignInAccount account = completedTask.getResult(ApiException.class);

      // Signed in successfully, start your activity here.

  } catch (ApiException e) {

      // The ApiException status code indicates the detailed failure reason.

      // Please refer to the GoogleSignInStatusCodes class reference for more information.

      Log.w(TAG, "signInResult:failed code=" + e.getStatusCode());

      updateUI(null);

  }

}