| /* |
| * Copyright 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 com.example.android.lifecycles.step3; |
| |
| import android.arch.lifecycle.MutableLiveData; |
| import android.os.Handler; |
| import android.os.Looper; |
| import android.os.SystemClock; |
| |
| import android.arch.lifecycle.LiveData; |
| import android.arch.lifecycle.ViewModel; |
| |
| import java.util.Timer; |
| import java.util.TimerTask; |
| |
| /** |
| * A ViewModel used for the {@link ChronoActivity3}. |
| */ |
| public class LiveDataTimerViewModel extends ViewModel { |
| |
| private static final int ONE_SECOND = 1000; |
| |
| private MutableLiveData<Long> elapsedTime = new MutableLiveData<>(); |
| |
| private long mInitialTime; |
| |
| public LiveDataTimerViewModel() { |
| mInitialTime = SystemClock.elapsedRealtime(); |
| Timer timer = new Timer(); |
| |
| // Update the elapsed time every second. |
| timer.scheduleAtFixedRate(new TimerTask() { |
| @Override |
| public void run() { |
| final long newValue = (SystemClock.elapsedRealtime() - mInitialTime) / 1000; |
| |
| // setValue() cannot be called from a background thread so post to main thread. |
| new Handler(Looper.getMainLooper()).post(new Runnable() { |
| @Override |
| public void run() { |
| |
| //TODO set the new value |
| |
| } |
| }); |
| } |
| }, ONE_SECOND, ONE_SECOND); |
| |
| } |
| |
| @SuppressWarnings("unused") // Will be used when step is completed |
| public LiveData<Long> getElapsedTime() { |
| return elapsedTime; |
| } |
| } |