120 lines
4.2 KiB
Java
120 lines
4.2 KiB
Java
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.service.dreams;
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import android.annotation.Nullable;
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import android.app.Activity;
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import android.content.Intent;
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import android.os.Bundle;
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import android.text.TextUtils;
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import com.android.internal.annotations.VisibleForTesting;
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/**
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* The Activity used by the {@link DreamService} to draw screensaver content
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* on the screen. This activity runs in dream application's process, but is started by a
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* specialized method: {@link com.android.server.wm.ActivityTaskManagerService#startDreamActivity}.
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* Hence, it does not have to be declared in the dream application's manifest.
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*
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* We use an activity as the dream canvas, because it interacts easier with other activities on
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* the screen (compared to a hover window). However, the DreamService is in charge of the dream and
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* it receives all Window.Callbacks from its main window. Since a window can have only one callback
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* receiver, the activity will not receive any window callbacks.
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*
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* Prior to the DreamActivity, the DreamService used to work with a hovering window and give the
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* screensaver application control over that window. The DreamActivity is a replacement to that
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* hover window. Using an activity allows for better-defined interactions with the rest of the
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* activities on screen. The switch to DreamActivity should be transparent to the screensaver
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* application, i.e. the application will still use DreamService APIs and not notice that the
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* system is using an activity behind the scenes.
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*
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* @hide
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*/
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@VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE)
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public class DreamActivity extends Activity {
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static final String EXTRA_CALLBACK = "binder";
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static final String EXTRA_DREAM_TITLE = "title";
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@Nullable
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private DreamService.DreamActivityCallbacks mCallback;
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public DreamActivity() {}
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@Override
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public void onCreate(@Nullable Bundle bundle) {
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super.onCreate(bundle);
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final String title = getTitle(getIntent());
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if (!TextUtils.isEmpty(title)) {
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setTitle(title);
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}
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mCallback = getCallback(getIntent());
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if (mCallback == null) {
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finishAndRemoveTask();
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return;
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}
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mCallback.onActivityCreated(this);
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}
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/**
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* Sets the title of the dream in the intent for starting the {@link DreamActivity}.
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*/
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public static void setTitle(Intent intent, CharSequence title) {
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if (TextUtils.isEmpty(title)) {
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return;
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}
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intent.putExtra(DreamActivity.EXTRA_DREAM_TITLE, title);
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}
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/**
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* Gets the title of the dream from the intent used to start the {@link DreamActivity}.
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*/
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public static String getTitle(Intent intent) {
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return intent.getStringExtra(EXTRA_DREAM_TITLE);
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}
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/**
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* Sets the dream callback in the intent for starting the {@link DreamActivity}.
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*/
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public static void setCallback(Intent intent, DreamService.DreamActivityCallbacks callback) {
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intent.putExtra(DreamActivity.EXTRA_CALLBACK, callback);
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}
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/**
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* Retrieves the dream callback from the intent used to start the {@link DreamActivity}.
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*/
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public static DreamService.DreamActivityCallbacks getCallback(Intent intent) {
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final Object binder = intent.getExtras().getBinder(EXTRA_CALLBACK);
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return (binder instanceof DreamService.DreamActivityCallbacks)
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? (DreamService.DreamActivityCallbacks) binder
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: null;
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}
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@Override
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public void onDestroy() {
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if (mCallback != null) {
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mCallback.onActivityDestroyed();
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}
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super.onDestroy();
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}
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}
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