| /* |
| * Copyright (C) 2016 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 android.service.autofill; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.os.RemoteException; |
| import com.android.internal.os.HandlerCaller; |
| import android.annotation.SdkConstant; |
| import android.app.Activity; |
| import android.app.Service; |
| import android.app.assist.AssistStructure; |
| import android.content.Intent; |
| import android.os.Bundle; |
| import android.os.CancellationSignal; |
| import android.os.IBinder; |
| import android.os.ICancellationSignal; |
| import android.os.Looper; |
| import android.util.Log; |
| |
| import com.android.internal.os.SomeArgs; |
| |
| //TODO(b/33197203): improve javadoc (of both class and methods); in particular, make sure the |
| //life-cycle (and how state could be maintained on server-side) is well documented. |
| |
| /** |
| * Top-level service of the current auto-fill service for a given user. |
| * |
| * <p>Apps providing auto-fill capabilities must extend this service. |
| */ |
| public abstract class AutoFillService extends Service { |
| private static final String TAG = "AutoFillService"; |
| |
| /** |
| * The {@link Intent} that must be declared as handled by the service. |
| * To be supported, the service must also require the |
| * {@link android.Manifest.permission#BIND_AUTO_FILL} permission so |
| * that other applications can not abuse it. |
| */ |
| @SdkConstant(SdkConstant.SdkConstantType.SERVICE_ACTION) |
| public static final String SERVICE_INTERFACE = "android.service.autofill.AutoFillService"; |
| |
| /** |
| * Name under which a AutoFillService component publishes information about itself. |
| * This meta-data should reference an XML resource containing a |
| * <code><{@link |
| * android.R.styleable#AutoFillService autofill-service}></code> tag. |
| * This is a a sample XML file configuring an AutoFillService: |
| * <pre> <autofill-service |
| * android:settingsActivity="foo.bar.SettingsActivity" |
| * . . . |
| * /></pre> |
| */ |
| public static final String SERVICE_META_DATA = "android.autofill"; |
| |
| // Internal extras |
| /** @hide */ |
| public static final String EXTRA_ACTIVITY_TOKEN = |
| "android.service.autofill.extra.ACTIVITY_TOKEN"; |
| |
| // Handler messages. |
| private static final int MSG_CONNECT = 1; |
| private static final int MSG_DISCONNECT = 2; |
| private static final int MSG_ON_FILL_REQUEST = 3; |
| private static final int MSG_ON_SAVE_REQUEST = 4; |
| |
| private final IAutoFillService mInterface = new IAutoFillService.Stub() { |
| @Override |
| public void onFillRequest(AssistStructure structure, Bundle extras, |
| IFillCallback callback) { |
| ICancellationSignal transport = CancellationSignal.createTransport(); |
| try { |
| callback.onCancellable(transport); |
| } catch (RemoteException e) { |
| e.rethrowFromSystemServer(); |
| } |
| mHandlerCaller.obtainMessageOOOO(MSG_ON_FILL_REQUEST, structure, |
| CancellationSignal.fromTransport(transport), extras, callback) |
| .sendToTarget(); |
| } |
| |
| @Override |
| public void onSaveRequest(AssistStructure structure, Bundle extras, |
| ISaveCallback callback) { |
| mHandlerCaller.obtainMessageOOO(MSG_ON_SAVE_REQUEST, structure, |
| extras, callback).sendToTarget(); |
| } |
| |
| @Override |
| public void onConnected() { |
| mHandlerCaller.sendMessage(mHandlerCaller.obtainMessage(MSG_CONNECT)); |
| } |
| |
| @Override |
| public void onDisconnected() { |
| mHandlerCaller.sendMessage(mHandlerCaller.obtainMessage(MSG_DISCONNECT)); |
| } |
| }; |
| |
| private final HandlerCaller.Callback mHandlerCallback = (msg) -> { |
| switch (msg.what) { |
| case MSG_CONNECT: { |
| onConnected(); |
| break; |
| } case MSG_ON_FILL_REQUEST: { |
| final SomeArgs args = (SomeArgs) msg.obj; |
| final AssistStructure structure = (AssistStructure) args.arg1; |
| final CancellationSignal cancellation = (CancellationSignal) args.arg2; |
| final Bundle extras = (Bundle) args.arg3; |
| final IFillCallback callback = (IFillCallback) args.arg4; |
| final FillCallback fillCallback = new FillCallback(callback); |
| args.recycle(); |
| onFillRequest(structure, extras, cancellation, fillCallback); |
| break; |
| } case MSG_ON_SAVE_REQUEST: { |
| final SomeArgs args = (SomeArgs) msg.obj; |
| final AssistStructure structure = (AssistStructure) args.arg1; |
| final Bundle extras = (Bundle) args.arg2; |
| final ISaveCallback callback = (ISaveCallback) args.arg3; |
| final SaveCallback saveCallback = new SaveCallback(callback); |
| args.recycle(); |
| onSaveRequest(structure, extras, saveCallback); |
| break; |
| } case MSG_DISCONNECT: { |
| onDisconnected(); |
| break; |
| } default: { |
| Log.w(TAG, "MyCallbacks received invalid message type: " + msg); |
| } |
| } |
| }; |
| |
| private HandlerCaller mHandlerCaller; |
| |
| /** |
| * {@inheritDoc} |
| * |
| * <strong>NOTE: </strong>if overridden, it must call {@code super.onCreate()}. |
| */ |
| @Override |
| public void onCreate() { |
| super.onCreate(); |
| mHandlerCaller = new HandlerCaller(null, Looper.getMainLooper(), mHandlerCallback, true); |
| } |
| |
| @Override |
| public final IBinder onBind(Intent intent) { |
| if (SERVICE_INTERFACE.equals(intent.getAction())) { |
| return mInterface.asBinder(); |
| } |
| Log.w(TAG, "Tried to bind to wrong intent: " + intent); |
| return null; |
| } |
| |
| /** |
| * Called when the Android system connects to service. |
| * |
| * <p>You should generally do initialization here rather than in {@link #onCreate}. |
| */ |
| public void onConnected() { |
| //TODO(b/33197203): is not called anymore, fix it! |
| } |
| |
| /** |
| * Called by the Android system do decide if an {@link Activity} can be auto-filled by the |
| * service. |
| * |
| * <p>Service must call one of the {@link FillCallback} methods (like |
| * {@link FillCallback#onSuccess(FillResponse)} |
| * or {@link FillCallback#onFailure(CharSequence)}) |
| * to notify the result of the request. |
| * |
| * @param structure {@link Activity}'s view structure. |
| * @param data bundle containing data passed by the service on previous calls to fill. |
| * This bundle allows your service to keep state between fill and save requests |
| * as well as when filling different sections of the UI as the system will try to |
| * aggressively unbind from the service to conserve resources. See {@link |
| * FillResponse} Javadoc for examples of multiple-sections requests. |
| * @param cancellationSignal signal for observing cancellation requests. The system will use |
| * this to notify you that the fill result is no longer needed and you should stop |
| * handling this fill request in order to save resources. |
| * @param callback object used to notify the result of the request. |
| */ |
| public abstract void onFillRequest(@NonNull AssistStructure structure, @Nullable Bundle data, |
| @NonNull CancellationSignal cancellationSignal, @NonNull FillCallback callback); |
| |
| /** |
| * Called when user requests service to save the fields of an {@link Activity}. |
| * |
| * <p>Service must call one of the {@link SaveCallback} methods (like |
| * {@link SaveCallback#onSuccess()} or {@link SaveCallback#onFailure(CharSequence)}) |
| * to notify the result of the request. |
| * |
| * @param structure {@link Activity}'s view structure. |
| * @param data bundle containing data passed by the service on previous calls to fill. |
| * This bundle allows your service to keep state between fill and save requests |
| * as well as when filling different sections of the UI as the system will try to |
| * aggressively unbind from the service to conserve resources. See {@link |
| * FillResponse} Javadoc for examples of multiple-sections requests. |
| * @param callback object used to notify the result of the request. |
| */ |
| public abstract void onSaveRequest(@NonNull AssistStructure structure, @Nullable Bundle data, |
| @NonNull SaveCallback callback); |
| |
| /** |
| * Called when the Android system disconnects from the service. |
| * |
| * <p> At this point this service may no longer be an active {@link AutoFillService}. |
| */ |
| public void onDisconnected() { |
| //TODO(b/33197203): is not called anymore, fix it! |
| } |
| } |