要转载请注明出处：http://gqdy365.iteye.com/blog/1066113，有很多转载了文章不写出处，还写的是什么小编最近做项目碰到什么问题怎么解决的的然后把文章贴下面，俨然一副他们自己的文章，不知羞耻！ 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： Java代码  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。