android系统信息（内存、cpu、sd卡、电量、版本）获取

出处：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： 

05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---MemTotal:       204876 kB05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---MemFree:          4596 kB05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Buffers:         16020 kB05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Cached:          82508 kB05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---SwapCached:         64 kB05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Active:         137104 kB05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Inactive:        41056 kB05-30 08:05:14.807: INFO/-SystemInfo-(1519): ---SwapTotal:       65528 kB05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---SwapFree:        65368 kB05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Dirty:              88 kB05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Writeback:           0 kB05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---AnonPages:       79672 kB05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Mapped:          38296 kB05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Slab:             5768 kB05-30 08:05:14.817: INFO/-SystemInfo-(1519): ---SReclaimable:     1856 kB05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---SUnreclaim:       3912 kB05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---PageTables:       8184 kB05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---NFS_Unstable:        0 kB05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---Bounce:              0 kB05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---CommitLimit:    167964 kB05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---Committed_AS: 11771920 kB05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---VmallocTotal:   761856 kB05-30 08:05:14.827: INFO/-SystemInfo-(1519): ---VmallocUsed:     83656 kB05-30 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 memoryromInfo[0] = getTotalInternalMemorySize();//Available rom memoryFile 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(){@Overridepublic 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];//KernelVersionlocalBufferedReader.close();} catch (IOException e) {}version[1] = Build.VERSION.RELEASE;// firmware versionversion[2]=Build.MODEL;//modelversion[3]=Build.DISPLAY;//system versionreturn 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。