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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings.accounts;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.accounts.AuthenticatorDescription;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.UserHandle;
import android.os.UserManager;
import android.util.Log;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
/**
* Helper class for monitoring accounts on the device for a given user.
*
* Classes using this helper should implement {@link OnAccountsUpdateListener}.
* {@link OnAccountsUpdateListener#onAccountsUpdate(UserHandle)} will then be
* called once accounts get updated. For setting up listening for account
* updates, {@link #listenToAccountUpdates()} and
* {@link #stopListeningToAccountUpdates()} should be used.
*/
final public class AuthenticatorHelper extends BroadcastReceiver {
private static final String TAG = "AuthenticatorHelper";
private Map<String, AuthenticatorDescription> mTypeToAuthDescription
= new HashMap<String, AuthenticatorDescription>();
private AuthenticatorDescription[] mAuthDescs;
private ArrayList<String> mEnabledAccountTypes = new ArrayList<String>();
private Map<String, Drawable> mAccTypeIconCache = new HashMap<String, Drawable>();
private final UserHandle mUserHandle;
private final UserManager mUm;
private final Context mContext;
private final OnAccountsUpdateListener mListener;
private boolean mListeningToAccountUpdates;
public interface OnAccountsUpdateListener {
void onAccountsUpdate(UserHandle userHandle);
}
public AuthenticatorHelper(Context context, UserHandle userHandle, UserManager userManager,
OnAccountsUpdateListener listener) {
mContext = context;
mUm = userManager;
mUserHandle = userHandle;
mListener = listener;
// This guarantees that the helper is ready to use once constructed
onAccountsUpdated(null);
}
public String[] getEnabledAccountTypes() {
return mEnabledAccountTypes.toArray(new String[mEnabledAccountTypes.size()]);
}
public void preloadDrawableForType(final Context context, final String accountType) {
new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... params) {
getDrawableForType(context, accountType);
return null;
}
}.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void[]) null);
}
/**
* Gets an icon associated with a particular account type. If none found, return null.
* @param accountType the type of account
* @return a drawable for the icon or null if one cannot be found.
*/
public Drawable getDrawableForType(Context context, final String accountType) {
Drawable icon = null;
synchronized (mAccTypeIconCache) {
if (mAccTypeIconCache.containsKey(accountType)) {
return mAccTypeIconCache.get(accountType);
}
}
if (mTypeToAuthDescription.containsKey(accountType)) {
try {
AuthenticatorDescription desc = mTypeToAuthDescription.get(accountType);
Context authContext = context.createPackageContextAsUser(desc.packageName, 0,
mUserHandle);
icon = mUm.getBadgedDrawableForUser(
authContext.getResources().getDrawable(desc.iconId), mUserHandle);
synchronized (mAccTypeIconCache) {
mAccTypeIconCache.put(accountType, icon);
}
} catch (PackageManager.NameNotFoundException e) {
} catch (Resources.NotFoundException e) {
}
}
if (icon == null) {
icon = context.getPackageManager().getDefaultActivityIcon();
}
return icon;
}
/**
* Gets the label associated with a particular account type. If none found, return null.
* @param accountType the type of account
* @return a CharSequence for the label or null if one cannot be found.
*/
public CharSequence getLabelForType(Context context, final String accountType) {
CharSequence label = null;
if (mTypeToAuthDescription.containsKey(accountType)) {
try {
AuthenticatorDescription desc = mTypeToAuthDescription.get(accountType);
Context authContext = context.createPackageContextAsUser(desc.packageName, 0,
mUserHandle);
label = authContext.getResources().getText(desc.labelId);
} catch (PackageManager.NameNotFoundException e) {
Log.w(TAG, "No label name for account type " + accountType);
} catch (Resources.NotFoundException e) {
Log.w(TAG, "No label icon for account type " + accountType);
}
}
return label;
}
/**
* Updates provider icons. Subclasses should call this in onCreate()
* and update any UI that depends on AuthenticatorDescriptions in onAuthDescriptionsUpdated().
*/
public void updateAuthDescriptions(Context context) {
mAuthDescs = AccountManager.get(context)
.getAuthenticatorTypesAsUser(mUserHandle.getIdentifier());
for (int i = 0; i < mAuthDescs.length; i++) {
mTypeToAuthDescription.put(mAuthDescs[i].type, mAuthDescs[i]);
}
}
public boolean containsAccountType(String accountType) {
return mTypeToAuthDescription.containsKey(accountType);
}
public AuthenticatorDescription getAccountTypeDescription(String accountType) {
return mTypeToAuthDescription.get(accountType);
}
public boolean hasAccountPreferences(final String accountType) {
if (containsAccountType(accountType)) {
AuthenticatorDescription desc = getAccountTypeDescription(accountType);
if (desc != null && desc.accountPreferencesId != 0) {
return true;
}
}
return false;
}
void onAccountsUpdated(Account[] accounts) {
updateAuthDescriptions(mContext);
if (accounts == null) {
accounts = AccountManager.get(mContext).getAccountsAsUser(mUserHandle.getIdentifier());
}
mEnabledAccountTypes.clear();
mAccTypeIconCache.clear();
for (int i = 0; i < accounts.length; i++) {
final Account account = accounts[i];
if (!mEnabledAccountTypes.contains(account.type)) {
mEnabledAccountTypes.add(account.type);
}
}
if (mListeningToAccountUpdates) {
mListener.onAccountsUpdate(mUserHandle);
}
}
@Override
public void onReceive(final Context context, final Intent intent) {
// TODO: watch for package upgrades to invalidate cache; see http://b/7206643
final Account[] accounts = AccountManager.get(mContext)
.getAccountsAsUser(mUserHandle.getIdentifier());
onAccountsUpdated(accounts);
}
public void listenToAccountUpdates() {
if (!mListeningToAccountUpdates) {
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(AccountManager.LOGIN_ACCOUNTS_CHANGED_ACTION);
// At disk full, certain actions are blocked (such as writing the accounts to storage).
// It is useful to also listen for recovery from disk full to avoid bugs.
intentFilter.addAction(Intent.ACTION_DEVICE_STORAGE_OK);
mContext.registerReceiverAsUser(this, mUserHandle, intentFilter, null, null);
mListeningToAccountUpdates = true;
}
}
public void stopListeningToAccountUpdates() {
if (mListeningToAccountUpdates) {
mContext.unregisterReceiver(this);
mListeningToAccountUpdates = false;
}
}
}
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