Android：系统信息（内存、cpu、sd卡、电量、版本）的获取

原文：http://gqdy365.iteye.com/blog/1066113

一、内存（ram）：
android的总内存大小信息存放在系统的/proc/meminfo文件里面，可以通过读取这个文件来获取这些信息：

public void getTotalMemory() {          String str1 = "/proc/meminfo";          String str2="";          try {              FileReader fr = new FileReader(str1);              BufferedReader localBufferedReader = new BufferedReader(fr, 8192);              while ((str2 = localBufferedReader.readLine()) != null) {                  Log.i(TAG, "---" + str2);              }          } catch (IOException e) {          }      }

运行信息如下：
Java代码

05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---MemTotal:       204876 kB  05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---MemFree:          4596 kB  05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Buffers:         16020 kB  05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Cached:          82508 kB  05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---SwapCached:         64 kB  05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Active:         137104 kB  05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Inactive:        41056 kB  05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---SwapTotal:       65528 kB  05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---SwapFree:        65368 kB  05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Dirty:              88 kB  05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Writeback:           0 kB  05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---AnonPages:       79672 kB  05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Mapped:          38296 kB  05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Slab:             5768 kB  05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---SReclaimable:     1856 kB  05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---SUnreclaim:       3912 kB  05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---PageTables:       8184 kB  05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---NFS_Unstable:        0 kB  05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---Bounce:              0 kB  05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---CommitLimit:    167964 kB  05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---Committed_AS: 11771920 kB  05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---VmallocTotal:   761856 kB  05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---VmallocUsed:     83656 kB  05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---VmallocChunk:   674820 kB

第一行是总内存大小(即用户可以使用的ram的大小)！其他各项的介绍大家可以看这儿：
http://bg135.com/android-phones-to-get-the-total-memory-and-available-memory.html

获取当前剩余内存(ram)大小的方法：
Java代码

public long getAvailMemory() {          ActivityManager am = (ActivityManager)mContext.getSystemService(Context.ACTIVITY_SERVICE);          ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo();          am.getMemoryInfo(mi);          return mi.availMem;      }

二、Rom大小
Java代码

public long[] getRomMemroy() {          long[] romInfo = new long[2];          //Total rom memory          romInfo[0] = getTotalInternalMemorySize();           //Available rom memory          File path = Environment.getDataDirectory();          StatFs stat = new StatFs(path.getPath());          long blockSize = stat.getBlockSize();          long availableBlocks = stat.getAvailableBlocks();          romInfo[1] = blockSize * availableBlocks;          getVersion();          return romInfo;      }       public long getTotalInternalMemorySize() {          File path = Environment.getDataDirectory();          StatFs stat = new StatFs(path.getPath());          long blockSize = stat.getBlockSize();          long totalBlocks = stat.getBlockCount();          return totalBlocks * blockSize;      }

注意类型，不然相乘之后会有溢出。可用内部存储的大小不能通过getRootDirectory();
取得，之前网上传的很多都是用getRootDirectory()取得的，我测试之后发现取得的数值不对。要根据getDataDirectory();
取得。

三、sdCard大小
Java代码

public long[] getSDCardMemory() {          long[] sdCardInfo=new long[2];          String state = Environment.getExternalStorageState();          if (Environment.MEDIA_MOUNTED.equals(state)) {              File sdcardDir = Environment.getExternalStorageDirectory();              StatFs sf = new StatFs(sdcardDir.getPath());              long bSize = sf.getBlockSize();              long bCount = sf.getBlockCount();              long availBlocks = sf.getAvailableBlocks();               sdCardInfo[0] = bSize * bCount;//总大小              sdCardInfo[1] = bSize * availBlocks;//可用大小          }          return sdCardInfo;      }

注意类型，不然相乘之后会有溢出。

四、电池电量
Java代码

private BroadcastReceiver batteryReceiver=new BroadcastReceiver(){          @Override          public void onReceive(Context context, Intent intent) {              int level = intent.getIntExtra("level", 0);              //  level加%就是当前电量了      }      };

然后在activity的oncreate()方法中注册
Java代码
registerReceiver(batteryReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

五、CPU信息
Java代码

public String[] getCpuInfo() {      String str1 = "/proc/cpuinfo";      String str2="";      String[] cpuInfo={"",""};      String[] arrayOfString;      try {          FileReader fr = new FileReader(str1);          BufferedReader localBufferedReader = new BufferedReader(fr, 8192);          str2 = localBufferedReader.readLine();          arrayOfString = str2.split("\\s+");          for (int i = 2; i < arrayOfString.length; i++) {              cpuInfo[0] = cpuInfo[0] + arrayOfString[i] + " ";          }          str2 = localBufferedReader.readLine();          arrayOfString = str2.split("\\s+");          cpuInfo[1] += arrayOfString[2];          localBufferedReader.close();      } catch (IOException e) {      }      return cpuInfo;  }

/proc/cpuinfo文件中第一行是CPU的型号，第二行是CPU的频率，可以通过读文件，读取这些数据！

六、系统的版本信息：
Java代码

public String[] getVersion(){      String[] version={"null","null","null","null"};      String str1 = "/proc/version";      String str2;      String[] arrayOfString;      try {          FileReader localFileReader = new FileReader(str1);          BufferedReader localBufferedReader = new BufferedReader(                  localFileReader, 8192);          str2 = localBufferedReader.readLine();          arrayOfString = str2.split("\\s+");          version[0]=arrayOfString[2];//KernelVersion          localBufferedReader.close();      } catch (IOException e) {      }      version[1] = Build.VERSION.RELEASE;// firmware version      version[2]=Build.MODEL;//model      version[3]=Build.DISPLAY;//system version      return version;  }

版本信息里面还包括型号等信息。

七、MAC地址和开机时间：
Java代码

public String[] getOtherInfo(){      String[] other={"null","null"};         WifiManager wifiManager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);         WifiInfo wifiInfo = wifiManager.getConnectionInfo();         if(wifiInfo.getMacAddress()!=null){          other[0]=wifiInfo.getMacAddress();      } else {          other[0] = "Fail";      }      other[1] = getTimes();         return other;  }  private String getTimes() {      long ut = SystemClock.elapsedRealtime() / 1000;      if (ut == 0) {          ut = 1;      }      int m = (int) ((ut / 60) % 60);      int h = (int) ((ut / 3600));      return h + " " + mContext.getString(R.string.info_times_hour) + m + " "              + mContext.getString(R.string.info_times_minute);  }

最后贴一个格式化数据的方法：
Java代码

public String formatSize(long size) {      String suffix = null;      float fSize=0;       if (size >= 1024) {          suffix = "KB";          fSize=size / 1024;          if (fSize >= 1024) {              suffix = "MB";              fSize /= 1024;          }          if (fSize >= 1024) {              suffix = "GB";              fSize /= 1024;          }      } else {          fSize = size;      }      java.text.DecimalFormat df = new java.text.DecimalFormat("#0.00");      StringBuilder resultBuffer = new StringBuilder(df.format(fSize));      if (suffix != null)          resultBuffer.append(suffix);      return resultBuffer.toString();  }

保留两位小数。

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