src/xwalk/runtime/android/core_internal/src/org/xwalk/core/internal/extension/api/device_capabilities/DeviceCapabilitiesMemory.java

   1 // Copyright (c) 2013 Intel Corporation. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 package org.xwalk.core.internal.extension.api.device_capabilities;
   6
   7 import android.app.ActivityManager;
   8 import android.app.ActivityManager.MemoryInfo;
   9 import android.content.Context;
  10 import android.util.Log;
  11 import android.os.Build;
  12
  13 import java.io.RandomAccessFile;
  14 import java.io.IOException;
  15
  16 import org.json.JSONException;
  17 import org.json.JSONObject;
  18
  19 class DeviceCapabilitiesMemory {
  20     private static final String MEM_INFO_FILE = "/proc/meminfo";
  21     private static final String TAG = "DeviceCapabilitiesMemory";
  22
  23     private DeviceCapabilities mDeviceCapabilities;
  24     private Context mContext;
  25
  26     private long mAvailableCapacity = 0;
  27     private long mCapacity = 0;
  28
  29     public DeviceCapabilitiesMemory(DeviceCapabilities instance,
  30                                     Context context) {
  31         mDeviceCapabilities = instance;
  32         mContext = context;
  33     }
  34
  35     public JSONObject getInfo() {
  36         readMemoryInfo();
  37
  38         JSONObject out = new JSONObject();
  39         try {
  40             out.put("capacity", mCapacity);
  41             out.put("availCapacity", mAvailableCapacity);
  42         } catch (JSONException e) {
  43             return mDeviceCapabilities.setErrorMessage(e.toString());
  44         }
  45
  46         return out;
  47     }
  48
  49     private void readMemoryInfo() {
  50         MemoryInfo mem_info = new MemoryInfo();
  51         ActivityManager activityManager = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
  52         activityManager.getMemoryInfo(mem_info);
  53
  54         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
  55             mCapacity = mem_info.totalMem;
  56         } else {
  57             mCapacity = getTotalMemFromFile();
  58         }
  59         mAvailableCapacity = mem_info.availMem;
  60     }
  61
  62     private long getTotalMemFromFile() {
  63         long capacity = 0;
  64         RandomAccessFile file = null;
  65
  66         try {
  67             file = new RandomAccessFile(MEM_INFO_FILE, "r");
  68             String line = file.readLine();
  69
  70             String[] arrs = line.split(":");
  71             if (!arrs[0].equals("MemTotal")) {
  72                 return 0;
  73             }
  74             String[] values = arrs[1].trim().split("\\s+");
  75             capacity = Long.parseLong(values[0]) * 1024;
  76         } catch (IOException e) {
  77             capacity = 0;
  78             Log.e(TAG, e.toString());
  79         } finally {
  80             try {
  81                 if (file != null) {
  82                     file.close();
  83                 }
  84             } catch (IOException e) {
  85                 Log.e(TAG, e.toString());
  86             }
  87         }
  88
  89         return capacity;
  90     }
  91 }