1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.retaildemo; 18 19 import android.content.Context; 20 import android.util.Log; 21 import libcore.io.IoUtils; 22 23 import java.io.DataInputStream; 24 import java.io.DataOutputStream; 25 import java.io.File; 26 import java.io.FileInputStream; 27 import java.io.FileOutputStream; 28 import java.io.IOException; 29 30 class DataReaderWriter { 31 private static final String TAG = "DataReaderWriter"; 32 private static final boolean DEBUG = false; 33 34 private static final String FILE_NAME = "last_download_info.txt"; 35 setElapsedRealTime(Context context, long elapsedRealTime)36 public static void setElapsedRealTime(Context context, long elapsedRealTime) { 37 FileOutputStream fileOutputStream = null; 38 DataOutputStream out = null; 39 try { 40 final String filePath = context.getObbDir() + File.separator + FILE_NAME; 41 final File file = new File(filePath); 42 if (!file.exists()) { 43 file.createNewFile(); 44 } 45 fileOutputStream = new FileOutputStream(filePath); 46 out = new DataOutputStream(fileOutputStream); 47 if (DEBUG) Log.d(TAG, "Writing value elapsedRealTime=" + elapsedRealTime); 48 out.writeLong(elapsedRealTime); 49 } catch (IOException e) { 50 Log.e(TAG, "Error writing elapsedRealTime=" + elapsedRealTime + " to file", e); 51 } finally { 52 IoUtils.closeQuietly(out); 53 IoUtils.closeQuietly(fileOutputStream); 54 } 55 } 56 getElapsedRealTime(Context context)57 public static long getElapsedRealTime(Context context) { 58 long elapsedRealTime = 0; 59 final String filePath = context.getObbDir() + File.separator + FILE_NAME; 60 if (!new File(filePath).exists()) { 61 return elapsedRealTime; 62 } 63 FileInputStream fileInputStream = null; 64 DataInputStream in = null; 65 try { 66 fileInputStream = new FileInputStream(filePath); 67 in = new DataInputStream(fileInputStream); 68 elapsedRealTime = in.readLong(); 69 if (DEBUG) Log.d(TAG, "Read value elapsedRealTime=" + elapsedRealTime); 70 } catch (IOException e) { 71 Log.e(TAG, "Error reading elapsedRealTime value from file", e); 72 } finally { 73 IoUtils.closeQuietly(in); 74 IoUtils.closeQuietly(fileInputStream); 75 } 76 return elapsedRealTime; 77 } 78 }