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/*
* 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.content.ContentProvider;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.CancellationSignal;
import android.os.Handler;
import android.os.Looper;
import android.os.StrictMode;
import android.os.StrictMode.ThreadPolicy;
import android.util.Log;
import java.util.concurrent.CountDownLatch;
/**
* A SliceProvider allows 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>
*
* @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 METHOD_SLICE = "bind_slice";
/**
* @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>
*
* @see {@link Slice}.
* @see {@link Slice#HINT_PARTIAL}
*/
// TODO: Provide alternate notifyChange that takes in the slice (i.e. notifyChange(Uri, Slice)).
public abstract Slice onBindSlice(Uri sliceUri);
@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)) {
getContext().enforceCallingPermission(permission.BIND_SLICE,
"Slice binding requires the permission BIND_SLICE");
Uri uri = extras.getParcelable(EXTRA_BIND_URI);
Slice s = handleBindSlice(uri);
Bundle b = new Bundle();
b.putParcelable(EXTRA_SLICE, s);
return b;
}
return super.call(method, arg, extras);
}
private Slice handleBindSlice(Uri sliceUri) {
Slice[] output = new Slice[1];
CountDownLatch latch = new CountDownLatch(1);
Handler mainHandler = new Handler(Looper.getMainLooper());
mainHandler.post(() -> {
ThreadPolicy oldPolicy = StrictMode.getThreadPolicy();
try {
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
.detectAll()
.penaltyDeath()
.build());
output[0] = onBindSlice(sliceUri);
} finally {
StrictMode.setThreadPolicy(oldPolicy);
latch.countDown();
}
});
try {
latch.await();
return output[0];
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
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