Android获取系统cpu信息，内存，版本，电量等信息

本文转自：http://www.cnblogs.com/brainy/archive/2012/05/30/2526752.html

1、CPU频率，CPU信息：/proc/cpuinfo和/proc/stat 

通过读取文件/proc/cpuinfo系统CPU的类型等多种信息。

读取/proc/stat 所有CPU活动的信息来计算CPU使用率

下面我们就来讲讲如何通过代码来获取CPU频率：

public class CpuManager {

    // 获取CPU最大频率（单位KHZ）
    // "/system/bin/cat" 命令行
    // "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq" 存储最大频率的文件的路径
    public static String getMaxCpuFreq() {
        String result = "";
        ProcessBuilder cmd;
        try {
                String[] args = { "/system/bin/cat","/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq" };
                cmd = new ProcessBuilder(args);
                Process process = cmd.start();
                InputStream in = process.getInputStream();
                byte[] re = new byte[24];
                while (in.read(re) != -1) {
                    result = result + new String(re);
                }
                in.close();
            } catch (IOException ex) {
                ex.printStackTrace();
                result = "N/A";
        }
        return result.trim();
    }
    
    // 获取CPU最小频率（单位KHZ）
    public static String getMinCpuFreq() {
        String result = "";
        ProcessBuilder cmd;
        try {
            String[] args = { "/system/bin/cat","/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq" };
            cmd = new ProcessBuilder(args);
            Process process = cmd.start();
            InputStream in = process.getInputStream();
            byte[] re = new byte[24];
            while (in.read(re) != -1) {
                result = result + new String(re);
            }
            in.close();
        } catch (IOException ex) {
            ex.printStackTrace();
            result = "N/A";
            }
            return result.trim();
    }
    
    // 实时获取CPU当前频率（单位KHZ）
    public static String getCurCpuFreq() {
        String result = "N/A";
        try {
            FileReader fr = new FileReader("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq");
            BufferedReader br = new BufferedReader(fr);
            String text = br.readLine();
            result = text.trim();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
    
    // 获取CPU名字
    public static String getCpuName() {
        try {
            FileReader fr = new FileReader("/proc/cpuinfo");
            BufferedReader br = new BufferedReader(fr);
            String text = br.readLine();
            String[] array = text.split(":\s+", 2);
            for (int i = 0; i < array.length; i++) {
            }
            return array[1];
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
    
    //CPU个数
    public static int getNumCores() {
        //Private Class to display only CPU devices in the directory listing
        class CpuFilter implements FileFilter {
            @Override
            public boolean accept(File pathname) {
                //Check if filename is "cpu", followed by a single digit number
                if(Pattern.matches("cpu[0-9]", pathname.getName())) {
                    return true;
                }
                return false;
            }      
        }

        try {
            //Get directory containing CPU info
            File dir = new File("/sys/devices/system/cpu/");
            //Filter to only list the devices we care about
            File[] files = dir.listFiles(new CpuFilter());
//            Log.d(TAG, "CPU Count: "+files.length);
            //Return the number of cores (virtual CPU devices)
            return files.length;
        } catch(Exception e) {
            //Print exception
//            Log.d(TAG, "CPU Count: Failed.");
            e.printStackTrace();
            //Default to return 1 core
            return 1;
        }
    }
    
    
}

2、内存：/proc/meminfo

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) {  
        }  
    }  

3、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;  
    }  

4、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;  
    }  

5、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  
    }  
    };  

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

6、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;  
}  

7、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);  
}