android系统信息（内存、cpu、sd卡、电量、版本）获取

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： 

 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： 

 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 

 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 

 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 

 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 

 registerReceiver(batteryReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

五、CPU信息 

 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： 

 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： 

 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： 

 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。