麻烦拍摄活动的结果时，从AccountManagerFuture接收发射意向 [英] Trouble capturing activity result when firing Intent received from AccountManagerFuture

问题描述

我试图按照验证身份OAuth2服务并实施，其中一个目的是包含在由AccountManagerFuture＃的getResult（）调用。

提供的捆绑的一部分

问题是，即使文档说使用活动＃startActivityForResult（...），目的有人告诉我火显然开始在自己的任务，导致onActivityResult立即被调用。

这我不清楚，我做正确的另一部分是我推出这个意图的方式。因为code调用的AccountManager＃getAuthToken（...）被埋工人线程与为当前活动进不去里面，我推出一个新的活动我称之为CredentialsActivity，然后使用启动操作系统提供的意图startActivityForResult。

这是我如何做到这一点：

 最后AccountManagerFuture＆LT;包＆GT;未来= AccountManager.getAuthToken（...）;

      //现在我们有了未来，我们提取了捆绑
      捆绑包= NULL;
      尝试 {
        捆绑= future.getResult（）;
      }赶上（例外五）{
        log.warn（即得到了一个异常）;
      }

      如果（丛== NULL）{
        log.info（无法获取身份验证令牌）;
        返回;
      }

      //检查用户需要输入凭据。
      最终意图askForPassword =（意向）bundle.get（AccountManager.KEY_INTENT）;
      如果（askForPassword！= NULL）{
        log.dev（需要提示输入凭据，射击意图......）;
        CredentialsActivity.promptForCredentials（背景下，askForPassword）;
      }
 

这些都是CredentialsActivity的相关部分：

 私有静态最终诠释REQUEST_ code_LAUNCH_CREDENTIALS_INTENT = 0;

      私有静态意图newCredentialsActivityIntent（上下文的背景下）{
        最终意向意图=新的意图（背景下，CredentialsActivity.class）;
        intent.addFlags（Intent.FLAG_ACTIVITY_NEW_TASK）;
        返回的意图;
      }

      公共静态无效promptForCredentials（上下文的背景下，意图credentialsIntent）{
        最终意向意图= newCredentialsActivityIntent（上下文）;
        intent.putExtra（Intent.EXTRA_INTENT，credentialsIntent）;

        context.startActivity（意向）;
      }
 

我火在onResume的意图：

  @覆盖
  保护无效onResume（）{
    super.onResume（）;
    最终意向意图= getIntent（）;
    最终意图credentialsIntent =（意向）intent.getParcelableExtra（Intent.EXTRA_INTENT）;
    如果（credentialsIntent！= NULL）{
      startActivityForResult（credentialsIntent，REQUEST_ code_LAUNCH_CREDENTIALS_INTENT）;
    }
  }
 

解决方案

好了，我想我这一个 - 我会后的答案，以防万一：

的问题是，该系统提供与NEW_TASK标志集的意图。我需要将其清除，使这项工作对我来说：

 最终意图credentialsIntent =（意向）intent.getParcelableExtra（Intent.EXTRA_INTENT）;
如果（credentialsIntent！= NULL）{
  credentialsIntent.setFlags（0）;
  startActivityForResult（credentialsIntent，REQUEST_ code_LAUNCH_CREDENTIALS_INTENT）;
}
 

I am trying to follow Authenticating to OAuth2 Services and implement the part where an Intent is included in the Bundle provided by the AccountManagerFuture#getResult() call.

The issue is, that even though the docs say to use Activity#startActivityForResult(...), the Intent I am told to fire apparently starts in its own task, resulting in onActivityResult being called immediately.

Another part which I am uncertain I am doing correctly is the way I launch this Intent. Because the code that calls AccountManager#getAuthToken(...) is buried inside a worker thread with no access to the current Activity, I am launching a new Activity I call "CredentialsActivity" which then launches the OS-provided Intent using startActivityForResult.

This is how I do that:

      final AccountManagerFuture<Bundle> future = AccountManager.getAuthToken(...);

      // Now that we have the Future, we extract the Bundle
      Bundle bundle = null;
      try {
        bundle = future.getResult();
      } catch (Exception e) {
        log.warn(e, "Got an Exception");
      }

      if (bundle == null) {
        log.info("Unable to get auth token");
        return;
      }

      // Check if the user needs to enter credentials.
      final Intent askForPassword = (Intent) bundle.get(AccountManager.KEY_INTENT);
      if (askForPassword != null) {
        log.dev("Need to prompt for credentials, firing Intent...");
        CredentialsActivity.promptForCredentials(context, askForPassword);
      }

These are the relevant parts of CredentialsActivity:

      private static final int REQUEST_CODE_LAUNCH_CREDENTIALS_INTENT = 0;

      private static Intent newCredentialsActivityIntent(Context context) {
        final Intent intent = new Intent(context, CredentialsActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        return intent;
      }

      public static void promptForCredentials(Context context, Intent credentialsIntent) {
        final Intent intent = newCredentialsActivityIntent(context);
        intent.putExtra(Intent.EXTRA_INTENT, credentialsIntent);

        context.startActivity(intent);
      }

I fire the Intent in onResume:

  @Override
  protected void onResume() {
    super.onResume();
    final Intent intent = getIntent();
    final Intent credentialsIntent = (Intent) intent.getParcelableExtra(Intent.EXTRA_INTENT);
    if (credentialsIntent != null) {
      startActivityForResult(credentialsIntent, REQUEST_CODE_LAUNCH_CREDENTIALS_INTENT);
    }
  }

解决方案

OK, so I think I figured this one out - I'll post the answer, just in case:

The issue is that the system provides the Intent with the NEW_TASK flag set. I needed to clear it to make this work for me:

final Intent credentialsIntent = (Intent) intent.getParcelableExtra(Intent.EXTRA_INTENT);
if (credentialsIntent != null) {
  credentialsIntent.setFlags(0);
  startActivityForResult(credentialsIntent, REQUEST_CODE_LAUNCH_CREDENTIALS_INTENT);
}

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