我正在尝试在我的应用程序上实现google登录。我设法登录并存储了令牌，但是由于该任务是异步的，所以我不知道它何时完成，因此我无法在其他方法中安全地使用令牌。我如何添加回调方法onPostExecute？
这是代码：
@Override
public void onConnected(Bundle bundle) {
// onConnected indicates that an account was selected on the device, that the selected
// account has granted any requested permissions to our app and that we were able to
// establish a service connection to Google Play services.
Log.d(TAG, "onConnected:" + bundle);
mShouldResolve = false;
mAccountName = Plus.AccountApi.getAccountName(mGoogleApiClient);
//HERE I RETRIEVE THE TOKEN AND NEED TO IMPLEMENT CALLBACK
new RetrieveTokenTask().execute(mAccountName);
// Show the signed-in UI
Intent intent = new Intent(getActivity(), MainActivity.class);
startActivity(intent);
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.sign_in_button) {
onSignInClicked();
}
}
private void onSignInClicked() {
// User clicked the sign-in button, so begin the sign-in process and automatically
// attempt to resolve any errors that occur.
mShouldResolve = true;
mGoogleApiClient.connect();
// Show a message to the user that we are signing in.
//mStatusTextView.setText(R.string.signing_in);
Log.i("GoogleSignIn", "in progress");
}
private class RetrieveTokenTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
String accountName = params[0];
String scopes = "oauth2:profile email";
String token = null;
try {
token = GoogleAuthUtil.getToken(getActivity().getApplicationContext(), accountName, scopes);
} catch (IOException e) {
Log.e(TAG, e.getMessage());
} catch (UserRecoverableAuthException e) {
//startActivityForResult(e.getIntent(), REQ_SIGN_IN_REQUIRED);
} catch (GoogleAuthException e) {
Log.e(TAG, e.getMessage());
}
return token;
}
@Override
protected void onPostExecute(String token) {
super.onPostExecute(token);
Log.i("Token Value: ", token);
//TODO : access token verifier https://developers.google.com/identity/sign-in/android/backend-auth
accessToken = token;
}
}
您可以在onPostExecute方法中启动主要活动。这样，您将确保任务已执行并且即将完成。
检查一下
private class RetrieveTokenTask extends AsyncTask<String, Void, String> {
private Callback callback;
public RetrieveTokenTask(Callback callback){
this.callback = callback;
}
@Override
protected String doInBackground(String... params) {
String accountName = params[0];
String scopes = "oauth2:profile email";
String token = null;
try {
token = GoogleAuthUtil.getToken(getActivity().getApplicationContext(), accountName, scopes);
} catch (IOException e) {
Log.e(TAG, e.getMessage());
} catch (UserRecoverableAuthException e) {
//startActivityForResult(e.getIntent(), REQ_SIGN_IN_REQUIRED);
} catch (GoogleAuthException e) {
Log.e(TAG, e.getMessage());
}
return token;
}
@Override
protected void onPostExecute(String token) {
super.onPostExecute(token);
Log.i("Token Value: ", token);
//TODO : access token verifier https://developers.google.com/identity/sign-in/android/backend-auth
accessToken = token;
callback.done();
}
}
//create an interface
public interface Callback{
//create the callback method
void done();
}
启动任务时，像这样在构造函数中传递回调接口的实例，例如
new RetrieveTokenTask(this).execute(mAccountName);
并让您的活动实现回调接口。例如MainActivity implements Callback
现在MainActivity将有一个done方法，该方法是ur回调。
我希望这个解释对您有所帮助。
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我来说两句