| /* |
| * Copyright (C) 2017 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.app.slice; |
| |
| import android.Manifest.permission; |
| import android.annotation.NonNull; |
| import android.content.ContentProvider; |
| import android.content.ContentResolver; |
| import android.content.ContentValues; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.database.ContentObserver; |
| import android.database.Cursor; |
| import android.net.Uri; |
| import android.os.Binder; |
| import android.os.Bundle; |
| import android.os.CancellationSignal; |
| import android.os.Handler; |
| import android.os.Looper; |
| import android.os.Process; |
| import android.os.StrictMode; |
| import android.os.StrictMode.ThreadPolicy; |
| import android.os.UserHandle; |
| import android.util.Log; |
| |
| import java.util.List; |
| import java.util.concurrent.CountDownLatch; |
| |
| /** |
| * A SliceProvider allows an app to provide content to be displayed in system spaces. This content |
| * is templated and can contain actions, and the behavior of how it is surfaced is specific to the |
| * system surface. |
| * <p> |
| * Slices are not currently live content. They are bound once and shown to the user. If the content |
| * changes due to a callback from user interaction, then |
| * {@link ContentResolver#notifyChange(Uri, ContentObserver)} should be used to notify the system. |
| * </p> |
| * <p> |
| * The provider needs to be declared in the manifest to provide the authority for the app. The |
| * authority for most slices is expected to match the package of the application. |
| * </p> |
| * |
| * <pre class="prettyprint"> |
| * {@literal |
| * <provider |
| * android:name="com.android.mypkg.MySliceProvider" |
| * android:authorities="com.android.mypkg" />} |
| * </pre> |
| * <p> |
| * Slices can be identified by a Uri or by an Intent. To link an Intent with a slice, the provider |
| * must have an {@link IntentFilter} matching the slice intent. When a slice is being requested via |
| * an intent, {@link #onMapIntentToUri(Intent)} can be called and is expected to return an |
| * appropriate Uri representing the slice. |
| * |
| * <pre class="prettyprint"> |
| * {@literal |
| * <provider |
| * android:name="com.android.mypkg.MySliceProvider" |
| * android:authorities="com.android.mypkg"> |
| * <intent-filter> |
| * <action android:name="android.intent.action.MY_SLICE_INTENT" /> |
| * </intent-filter> |
| * </provider>} |
| * </pre> |
| * |
| * @see Slice |
| */ |
| public abstract class SliceProvider extends ContentProvider { |
| /** |
| * This is the Android platform's MIME type for a slice: URI |
| * containing a slice implemented through {@link SliceProvider}. |
| */ |
| public static final String SLICE_TYPE = "vnd.android.slice"; |
| |
| private static final String TAG = "SliceProvider"; |
| /** |
| * @hide |
| */ |
| public static final String EXTRA_BIND_URI = "slice_uri"; |
| /** |
| * @hide |
| */ |
| public static final String EXTRA_SUPPORTED_SPECS = "supported_specs"; |
| /** |
| * @hide |
| */ |
| public static final String METHOD_SLICE = "bind_slice"; |
| /** |
| * @hide |
| */ |
| public static final String METHOD_MAP_INTENT = "map_slice"; |
| /** |
| * @hide |
| */ |
| public static final String METHOD_PIN = "pin"; |
| /** |
| * @hide |
| */ |
| public static final String METHOD_UNPIN = "unpin"; |
| /** |
| * @hide |
| */ |
| public static final String EXTRA_INTENT = "slice_intent"; |
| /** |
| * @hide |
| */ |
| public static final String EXTRA_SLICE = "slice"; |
| |
| private static final boolean DEBUG = false; |
| |
| /** |
| * Implemented to create a slice. Will be called on the main thread. |
| * <p> |
| * onBindSlice should return as quickly as possible so that the UI tied |
| * to this slice can be responsive. No network or other IO will be allowed |
| * during onBindSlice. Any loading that needs to be done should happen |
| * off the main thread with a call to {@link ContentResolver#notifyChange(Uri, ContentObserver)} |
| * when the app is ready to provide the complete data in onBindSlice. |
| * <p> |
| * The slice returned should have a spec that is compatible with one of |
| * the supported specs. |
| * |
| * @param sliceUri Uri to bind. |
| * @param supportedSpecs List of supported specs. |
| * @see {@link Slice}. |
| * @see {@link Slice#HINT_PARTIAL} |
| */ |
| public Slice onBindSlice(Uri sliceUri, List<SliceSpec> supportedSpecs) { |
| return onBindSlice(sliceUri); |
| } |
| |
| /** |
| * @deprecated migrating to {@link #onBindSlice(Uri, List)} |
| */ |
| @Deprecated |
| public Slice onBindSlice(Uri sliceUri) { |
| return null; |
| } |
| |
| /** |
| * Called to inform an app that a slice has been pinned. |
| * <p> |
| * Pinning is a way that slice hosts use to notify apps of which slices |
| * they care about updates for. When a slice is pinned the content is |
| * expected to be relatively fresh and kept up to date. |
| * <p> |
| * Being pinned does not provide any escalated privileges for the slice |
| * provider. So apps should do things such as turn on syncing or schedule |
| * a job in response to a onSlicePinned. |
| * <p> |
| * Pinned state is not persisted through a reboot, and apps can expect a |
| * new call to onSlicePinned for any slices that should remain pinned |
| * after a reboot occurs. |
| * |
| * @param sliceUri The uri of the slice being unpinned. |
| * @see #onSliceUnpinned(Uri) |
| */ |
| public void onSlicePinned(Uri sliceUri) { |
| } |
| |
| /** |
| * Called to inform an app that a slices is no longer pinned. |
| * <p> |
| * This means that no other apps on the device care about updates to this |
| * slice anymore and therefore it is not important to be updated. Any syncs |
| * or jobs related to this slice should be cancelled. |
| * @see #onSlicePinned(Uri) |
| */ |
| public void onSliceUnpinned(Uri sliceUri) { |
| } |
| |
| /** |
| * This method must be overridden if an {@link IntentFilter} is specified on the SliceProvider. |
| * In that case, this method can be called and is expected to return a non-null Uri representing |
| * a slice. Otherwise this will throw {@link UnsupportedOperationException}. |
| * |
| * @return Uri representing the slice associated with the provided intent. |
| * @see {@link Slice} |
| */ |
| public @NonNull Uri onMapIntentToUri(Intent intent) { |
| throw new UnsupportedOperationException( |
| "This provider has not implemented intent to uri mapping"); |
| } |
| |
| @Override |
| public final int update(Uri uri, ContentValues values, String selection, |
| String[] selectionArgs) { |
| if (DEBUG) Log.d(TAG, "update " + uri); |
| return 0; |
| } |
| |
| @Override |
| public final int delete(Uri uri, String selection, String[] selectionArgs) { |
| if (DEBUG) Log.d(TAG, "delete " + uri); |
| return 0; |
| } |
| |
| @Override |
| public final Cursor query(Uri uri, String[] projection, String selection, |
| String[] selectionArgs, String sortOrder) { |
| if (DEBUG) Log.d(TAG, "query " + uri); |
| return null; |
| } |
| |
| @Override |
| public final Cursor query(Uri uri, String[] projection, String selection, String[] |
| selectionArgs, String sortOrder, CancellationSignal cancellationSignal) { |
| if (DEBUG) Log.d(TAG, "query " + uri); |
| return null; |
| } |
| |
| @Override |
| public final Cursor query(Uri uri, String[] projection, Bundle queryArgs, |
| CancellationSignal cancellationSignal) { |
| if (DEBUG) Log.d(TAG, "query " + uri); |
| return null; |
| } |
| |
| @Override |
| public final Uri insert(Uri uri, ContentValues values) { |
| if (DEBUG) Log.d(TAG, "insert " + uri); |
| return null; |
| } |
| |
| @Override |
| public final String getType(Uri uri) { |
| if (DEBUG) Log.d(TAG, "getType " + uri); |
| return SLICE_TYPE; |
| } |
| |
| @Override |
| public Bundle call(String method, String arg, Bundle extras) { |
| if (method.equals(METHOD_SLICE)) { |
| Uri uri = extras.getParcelable(EXTRA_BIND_URI); |
| if (!UserHandle.isSameApp(Binder.getCallingUid(), Process.myUid())) { |
| getContext().enforceUriPermission(uri, permission.BIND_SLICE, |
| permission.BIND_SLICE, Binder.getCallingPid(), Binder.getCallingUid(), |
| Intent.FLAG_GRANT_WRITE_URI_PERMISSION, |
| "Slice binding requires the permission BIND_SLICE"); |
| } |
| List<SliceSpec> supportedSpecs = extras.getParcelableArrayList(EXTRA_SUPPORTED_SPECS); |
| |
| Slice s = handleBindSlice(uri, supportedSpecs); |
| Bundle b = new Bundle(); |
| b.putParcelable(EXTRA_SLICE, s); |
| return b; |
| } else if (method.equals(METHOD_MAP_INTENT)) { |
| getContext().enforceCallingPermission(permission.BIND_SLICE, |
| "Slice binding requires the permission BIND_SLICE"); |
| Intent intent = extras.getParcelable(EXTRA_INTENT); |
| if (intent == null) return null; |
| Uri uri = onMapIntentToUri(intent); |
| List<SliceSpec> supportedSpecs = extras.getParcelableArrayList(EXTRA_SUPPORTED_SPECS); |
| Bundle b = new Bundle(); |
| if (uri != null) { |
| Slice s = handleBindSlice(uri, supportedSpecs); |
| b.putParcelable(EXTRA_SLICE, s); |
| } else { |
| b.putParcelable(EXTRA_SLICE, null); |
| } |
| return b; |
| } else if (method.equals(METHOD_PIN)) { |
| Uri uri = extras.getParcelable(EXTRA_BIND_URI); |
| if (!UserHandle.isSameApp(Binder.getCallingUid(), Process.myUid())) { |
| getContext().enforceUriPermission(uri, permission.BIND_SLICE, |
| permission.BIND_SLICE, Binder.getCallingPid(), Binder.getCallingUid(), |
| Intent.FLAG_GRANT_WRITE_URI_PERMISSION, |
| "Slice binding requires the permission BIND_SLICE"); |
| } |
| handlePinSlice(uri); |
| } else if (method.equals(METHOD_UNPIN)) { |
| Uri uri = extras.getParcelable(EXTRA_BIND_URI); |
| if (!UserHandle.isSameApp(Binder.getCallingUid(), Process.myUid())) { |
| getContext().enforceUriPermission(uri, permission.BIND_SLICE, |
| permission.BIND_SLICE, Binder.getCallingPid(), Binder.getCallingUid(), |
| Intent.FLAG_GRANT_WRITE_URI_PERMISSION, |
| "Slice binding requires the permission BIND_SLICE"); |
| } |
| handleUnpinSlice(uri); |
| } |
| return super.call(method, arg, extras); |
| } |
| |
| private void handlePinSlice(Uri sliceUri) { |
| if (Looper.myLooper() == Looper.getMainLooper()) { |
| onSlicePinned(sliceUri); |
| } else { |
| CountDownLatch latch = new CountDownLatch(1); |
| Handler.getMain().post(() -> { |
| onSlicePinned(sliceUri); |
| latch.countDown(); |
| }); |
| try { |
| latch.await(); |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |
| |
| private void handleUnpinSlice(Uri sliceUri) { |
| if (Looper.myLooper() == Looper.getMainLooper()) { |
| onSliceUnpinned(sliceUri); |
| } else { |
| CountDownLatch latch = new CountDownLatch(1); |
| Handler.getMain().post(() -> { |
| onSliceUnpinned(sliceUri); |
| latch.countDown(); |
| }); |
| try { |
| latch.await(); |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |
| |
| private Slice handleBindSlice(Uri sliceUri, List<SliceSpec> supportedSpecs) { |
| if (Looper.myLooper() == Looper.getMainLooper()) { |
| return onBindSliceStrict(sliceUri, supportedSpecs); |
| } else { |
| CountDownLatch latch = new CountDownLatch(1); |
| Slice[] output = new Slice[1]; |
| Handler.getMain().post(() -> { |
| output[0] = onBindSliceStrict(sliceUri, supportedSpecs); |
| latch.countDown(); |
| }); |
| try { |
| latch.await(); |
| return output[0]; |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |
| |
| private Slice onBindSliceStrict(Uri sliceUri, List<SliceSpec> supportedSpecs) { |
| ThreadPolicy oldPolicy = StrictMode.getThreadPolicy(); |
| try { |
| StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder() |
| .detectAll() |
| .penaltyDeath() |
| .build()); |
| return onBindSlice(sliceUri, supportedSpecs); |
| } finally { |
| StrictMode.setThreadPolicy(oldPolicy); |
| } |
| } |
| } |