Android -- 系统信息（内存、cpu、sd卡、电量、版本）获取

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)！

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;  
    }

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。

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。

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));

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！

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。

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);  
}

我是天王盖地虎的分割线                                                               

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