Return non-null for methods with AccountAuthenticatorResponse argument

The AbstractAccountAuthenticator methods that take an
AccountAuthenticatorResponse argument expect the receipient either
return a non-null value immediately or later on call the
AccountAuthenticatorResponse. Returning null for presumably uncalled
methods led to surprises when they were invoked from unexpected
contexts such as Settings, leading to a hang on "Add Account".

Change-Id: I0f7b2667c4fd4632921f2e2bed10266dd6662720
1 file changed
tree: 28b062a6ffb66bb1d64770cdb15427e68f8081e2
  1. res/
  2. src/
  3. support/
  4. tests/
  5. Android.mk
  6. AndroidManifest.xml