e9b4b84dae
Since adding a public api for the playground app was problematic, we now keep track of onResume and onDestroy calls globally inside the app. This fixes a few bugs in cases where tasks would be hidden from the ActivityManger#.getAppTasks() method and allows us to listen for changes allowing us to do without a periodic refresh of the UI. Test: Manual Change-Id: Idb834cbdc7aad6442dd962c95b5321e1d75695fe
70 lines
2.2 KiB
Java
70 lines
2.2 KiB
Java
/*
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* Copyright (C) 2018 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 com.example.android.intentplayground;
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import androidx.lifecycle.LiveData;
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import androidx.lifecycle.MutableLiveData;
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import androidx.lifecycle.ViewModel;
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import java.util.List;
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import java.util.function.Consumer;
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public class BaseActivityViewModel extends ViewModel {
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enum FabAction {Show, Hide}
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private final MutableLiveData<FabAction> mFabActions;
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/**
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* Republish {@link BaseActivity#addTrackerListener(Consumer)} in a lifecycle safe manner.
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* The {@link BaseActivity#addTrackerListener(Consumer)} that is registered in this class,
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* forwards the value to this, to enjoy all the guarantees {@link import
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* androidx.lifecycle.LiveData;} gives.
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*/
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private final MutableLiveData<List<Tracking.Task>> mRefreshTree;
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private final Consumer<List<Tracking.Task>> mTrackingListener;
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public BaseActivityViewModel() {
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mFabActions = new MutableLiveData<>();
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mRefreshTree = new MutableLiveData<>();
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mTrackingListener = tasks -> mRefreshTree.setValue(tasks);
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BaseActivity.addTrackerListener(mTrackingListener);
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}
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public void actOnFab(FabAction action) {
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mFabActions.setValue(action);
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}
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public LiveData<FabAction> getFabActions() {
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return mFabActions;
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}
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/**
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* @return LiveData that publishes the new state of {@link com.android.server.wm.Task} and
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* {@link android.app.Activity}-s whenever that state has been changed.
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*/
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public LiveData<List<Tracking.Task>> getRefresh() {
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return mRefreshTree;
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}
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@Override
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public void onCleared() {
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BaseActivity.removeTrackerListener(mTrackingListener);
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}
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}
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