@Override
protected List<Label> doInBackground(Void... params) {
final List<Label> allLabels = mClient.getAllLabels();
if ((allLabels == null) || allLabels.isEmpty()) {
return null;
}
final PackageManager pm = mContext.getPackageManager();
final List<Label> candidates = new ArrayList<>(allLabels);
ListIterator<Label> i = candidates.listIterator();
// Iterate through the labels database, and prune labels that belong
// to valid packages.
while (i.hasNext()) {
final Label l = i.next();
// Ensure the label has a matching installed package.
final String packageName = l.getPackageName();
PackageInfo packageInfo;
try {
packageInfo = pm.getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
} catch (NameNotFoundException e) {
// If there's no installed package, leave the label in the
// list for removal.
LogUtils.log(
CustomLabelManager.class,
Log.VERBOSE,
"Consistency check removing label for unknown package %s.",
packageName);
continue;
}
// Ensure the signature hash of the application matches
// the hash of the package when the label was stored.
final String expectedHash = l.getPackageSignature();
final String actualHash = computePackageSignatureHash(packageInfo);
if (TextUtils.isEmpty(expectedHash)
|| TextUtils.isEmpty(actualHash)
|| !expectedHash.equals(actualHash)) {
// If the expected or actual signature hashes aren't
// valid, or they don't match, leave the label in the list
// for removal.
LogUtils.log(
CustomLabelManager.class,
Log.WARN,
"Consistency check removing label due to signature mismatch " + "for package %s.",
packageName);
continue;
}
// If the label has passed all consistency checks, prune the
// label from the list of potentials for removal.
i.remove();
}
return candidates; // now containing only labels for removal
}
// Note this comparator is not consistent with equals in Label, we should just implement
// compareTo there, but will wait for BrailleBack to be merged with TalkBack
@Override
public int compare(Label first, Label second) {
if (first == null) {
if (second == null) {
return 0;
} else {
return -1;
}
}
if (second == null) return 1;
int ret = first.getPackageName().compareTo(second.getPackageName());
if (ret != 0) return ret;
return first.getViewName().compareTo(second.getViewName());
}
@Override
protected void onPostExecute(Label result) {
LogUtils.log(
this, Log.VERBOSE, "LabelAddTask(%d) complete, stored as %s", hashCode(), result);
mRequest.invokeCallback(result);
if (result != null) {
sendCacheRefreshIntent(result.getPackageName());
}
super.onPostExecute(result);
}
/**
* Retrieves a {@link Label} from the label cache given a fully-qualified resource identifier
* name.
*
* @param resourceName The fully-qualified resource identifier, such as
* "com.android.deskclock:id/analog_appwidget", as provided by {@link
* AccessibilityNodeInfo#getViewIdResourceName()}
* @return The {@link Label} matching the provided identifier, or {@code null} if no such label
* exists or has not yet been fetched from storage
*/
public Label getLabelForViewIdFromCache(String resourceName) {
if (!isInitialized()) {
return null;
}
Pair<String, String> parsedId = splitResourceName(resourceName);
if (parsedId == null) {
return null;
}
Label search = new Label(parsedId.first, null, parsedId.second, null, null, 0, null, 0);
Label result = mLabelCache.ceiling(search);
// TODO: This can be done much simplier with modifying equals in Label but want to wait
// until BrailleBack is integrate to ensure compatibility
if (result != null
&& search.getViewName() != null
&& search.getViewName().equals(result.getViewName())
&& search.getPackageName() != null
&& search.getPackageName().equals(result.getPackageName())) {
return result;
}
return null;
}