src/xwalk/runtime/android/core/src/org/xwalk/core/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.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 import org.xwalk.core.extension.XWalkExtensionContext;
  19
  20 class DeviceCapabilitiesMemory {
  21     private static final String MEM_INFO_FILE = "/proc/meminfo";
  22     private static final String TAG = "DeviceCapabilitiesMemory";
  23
  24     private DeviceCapabilities mDeviceCapabilities;
  25     private Context mContext;
  26
  27     private long mAvailableCapacity = 0;
  28     private long mCapacity = 0;
  29
  30     public DeviceCapabilitiesMemory(DeviceCapabilities instance,
  31                                     XWalkExtensionContext context) {
  32         mDeviceCapabilities = instance;
  33         mContext = context.getContext();
  34     }
  35
  36     public JSONObject getInfo() {
  37         readMemoryInfo();
  38
  39         JSONObject out = new JSONObject();
  40         try {
  41             out.put("capacity", mCapacity);
  42             out.put("availCapacity", mAvailableCapacity);
  43         } catch (JSONException e) {
  44             return mDeviceCapabilities.setErrorMessage(e.toString());
  45         }
  46
  47         return out;
  48     }
  49
  50     private void readMemoryInfo() {
  51         MemoryInfo mem_info = new MemoryInfo();
  52         ActivityManager activityManager = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
  53         activityManager.getMemoryInfo(mem_info);
  54
  55         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
  56             mCapacity = mem_info.totalMem;
  57         } else {
  58             mCapacity = getTotalMemFromFile();
  59         }
  60         mAvailableCapacity = mem_info.availMem;
  61     }
  62
  63     private long getTotalMemFromFile() {
  64         long capacity = 0;
  65         RandomAccessFile file = null;
  66
  67         try {
  68             file = new RandomAccessFile(MEM_INFO_FILE, "r");
  69             String line = file.readLine();
  70
  71             String[] arrs = line.split(":");
  72             if (!arrs[0].equals("MemTotal")) {
  73                 return 0;
  74             }
  75             String[] values = arrs[1].trim().split("\\s+");
  76             capacity = Long.parseLong(values[0]) * 1024;
  77         } catch (IOException e) {
  78             capacity = 0;
  79             Log.e(TAG, e.toString());
  80         } finally {
  81             try {
  82                 if (file != null) {
  83                     file.close();
  84                 }
  85             } catch (IOException e) {
  86                 Log.e(TAG, e.toString());
  87             }
  88         }
  89
  90         return capacity;
  91     }
  92 }