| /* |
| * Copyright 2018 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 androidx.slice; |
| |
| import static androidx.slice.widget.SliceLiveData.SUPPORTED_SPECS; |
| |
| import android.content.Context; |
| import android.content.Intent; |
| import android.database.ContentObserver; |
| import android.net.Uri; |
| import android.os.AsyncTask; |
| import android.os.Build; |
| import android.os.Handler; |
| import android.os.Looper; |
| import android.util.ArrayMap; |
| import android.util.Pair; |
| |
| import androidx.annotation.NonNull; |
| import androidx.annotation.RestrictTo; |
| import androidx.core.content.PermissionChecker; |
| |
| import java.util.concurrent.Executor; |
| |
| /** |
| * @hide |
| */ |
| @RestrictTo(RestrictTo.Scope.LIBRARY) |
| public abstract class SliceManagerBase extends SliceManager { |
| private final ArrayMap<Pair<Uri, SliceCallback>, SliceListenerImpl> mListenerLookup = |
| new ArrayMap<>(); |
| protected final Context mContext; |
| |
| SliceManagerBase(Context context) { |
| mContext = context; |
| } |
| |
| @Override |
| public void registerSliceCallback(@NonNull Uri uri, @NonNull SliceCallback callback) { |
| final Handler h = new Handler(Looper.getMainLooper()); |
| registerSliceCallback(uri, new Executor() { |
| @Override |
| public void execute(@NonNull Runnable command) { |
| h.post(command); |
| } |
| }, callback); |
| } |
| |
| @Override |
| public void registerSliceCallback(@NonNull Uri uri, @NonNull Executor executor, |
| @NonNull SliceCallback callback) { |
| getListener(uri, callback, new SliceListenerImpl(uri, executor, callback)).startListening(); |
| } |
| |
| @Override |
| public void unregisterSliceCallback(@NonNull Uri uri, @NonNull SliceCallback callback) { |
| SliceListenerImpl impl = mListenerLookup.remove(new Pair<>(uri, callback)); |
| if (impl != null) impl.stopListening(); |
| } |
| |
| @Override |
| @PermissionChecker.PermissionResult |
| public int checkSlicePermission(@NonNull Uri uri, int pid, int uid) { |
| // TODO: Switch off Uri permissions. |
| return mContext.checkUriPermission(uri, pid, uid, |
| Intent.FLAG_GRANT_WRITE_URI_PERMISSION); |
| } |
| |
| @Override |
| public void grantSlicePermission(@NonNull String toPackage, @NonNull Uri uri) { |
| // TODO: Switch off Uri permissions. |
| mContext.grantUriPermission(toPackage, uri, |
| Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION |
| | Intent.FLAG_GRANT_WRITE_URI_PERMISSION |
| | Intent.FLAG_GRANT_PREFIX_URI_PERMISSION); |
| } |
| |
| @Override |
| public void revokeSlicePermission(@NonNull String toPackage, @NonNull Uri uri) { |
| // TODO: Switch off Uri permissions. |
| if (Build.VERSION.SDK_INT >= 26) { |
| mContext.revokeUriPermission(toPackage, uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION); |
| } |
| } |
| |
| |
| private SliceListenerImpl getListener(Uri uri, SliceCallback callback, |
| SliceListenerImpl listener) { |
| Pair<Uri, SliceCallback> key = new Pair<>(uri, callback); |
| if (mListenerLookup.containsKey(key)) { |
| mListenerLookup.get(key).stopListening(); |
| } |
| mListenerLookup.put(key, listener); |
| return listener; |
| } |
| |
| private class SliceListenerImpl { |
| |
| private Uri mUri; |
| private final Executor mExecutor; |
| private final SliceCallback mCallback; |
| private boolean mPinned; |
| |
| SliceListenerImpl(Uri uri, Executor executor, SliceCallback callback) { |
| mUri = uri; |
| mExecutor = executor; |
| mCallback = callback; |
| } |
| |
| void startListening() { |
| mContext.getContentResolver().registerContentObserver(mUri, true, mObserver); |
| tryPin(); |
| } |
| |
| private void tryPin() { |
| if (!mPinned) { |
| try { |
| pinSlice(mUri); |
| mPinned = true; |
| } catch (SecurityException e) { |
| // No permission currently. |
| } |
| } |
| } |
| |
| void stopListening() { |
| mContext.getContentResolver().unregisterContentObserver(mObserver); |
| if (mPinned) { |
| unpinSlice(mUri); |
| mPinned = false; |
| } |
| } |
| |
| private final Runnable mUpdateSlice = new Runnable() { |
| @Override |
| public void run() { |
| tryPin(); |
| final Slice s = Slice.bindSlice(mContext, mUri, SUPPORTED_SPECS); |
| mExecutor.execute(new Runnable() { |
| @Override |
| public void run() { |
| mCallback.onSliceUpdated(s); |
| } |
| }); |
| } |
| }; |
| |
| private final ContentObserver mObserver = new ContentObserver( |
| new Handler(Looper.getMainLooper())) { |
| @Override |
| public void onChange(boolean selfChange) { |
| AsyncTask.execute(mUpdateSlice); |
| } |
| }; |
| } |
| } |