| /* |
| * 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.ContentProviderClient; |
| import android.content.Context; |
| import android.database.ContentObserver; |
| import android.net.Uri; |
| import android.os.AsyncTask; |
| import android.os.Handler; |
| import android.os.Looper; |
| import android.util.ArrayMap; |
| import android.util.Pair; |
| |
| import androidx.annotation.NonNull; |
| import androidx.annotation.RequiresApi; |
| import androidx.annotation.RestrictTo; |
| |
| import java.util.concurrent.Executor; |
| |
| /** |
| * @hide |
| */ |
| @RestrictTo(RestrictTo.Scope.LIBRARY) |
| @RequiresApi(19) |
| public abstract class SliceViewManagerBase extends SliceViewManager { |
| private final ArrayMap<Pair<Uri, SliceCallback>, SliceListenerImpl> mListenerLookup = |
| new ArrayMap<>(); |
| protected final Context mContext; |
| |
| SliceViewManagerBase(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) { |
| synchronized (mListenerLookup) { |
| SliceListenerImpl impl = mListenerLookup.remove(new Pair<>(uri, callback)); |
| if (impl != null) impl.stopListening(); |
| } |
| } |
| |
| |
| private SliceListenerImpl getListener(Uri uri, SliceCallback callback, |
| SliceListenerImpl listener) { |
| Pair<Uri, SliceCallback> key = new Pair<>(uri, callback); |
| synchronized (mListenerLookup) { |
| SliceListenerImpl oldImpl = mListenerLookup.put(key, listener); |
| if (oldImpl != null) { |
| oldImpl.stopListening(); |
| } |
| } |
| return listener; |
| } |
| |
| private class SliceListenerImpl { |
| |
| Uri mUri; |
| final Executor mExecutor; |
| final SliceCallback mCallback; |
| private boolean mPinned; |
| |
| SliceListenerImpl(Uri uri, Executor executor, SliceCallback callback) { |
| mUri = uri; |
| mExecutor = executor; |
| mCallback = callback; |
| } |
| |
| void startListening() { |
| ContentProviderClient provider = |
| mContext.getContentResolver().acquireContentProviderClient(mUri); |
| if (provider != null) { |
| provider.release(); |
| mContext.getContentResolver().registerContentObserver(mUri, true, mObserver); |
| tryPin(); |
| } |
| } |
| |
| 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; |
| } |
| } |
| |
| 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); |
| } |
| }; |
| } |
| } |