Android系統信息（內存、cpu、sd卡、電量、版本）獲取

一、內存（ram）：

android的總內存大小信息存放在系統的/proc/meminfo文件裡面，可以通過讀取這個文件來獲取這些信息：

    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) {  
            }  
        }  

運行信息如下： 第一行是總內存大小(即用戶可以使用的ram的大小)

11-30 08:05:14.807: INFO/-SystemInfo-(1519): ---MemTotal:       204876 kB  
11-30 08:05:14.807: INFO/-SystemInfo-(1519): ---MemFree:          4596 kB  
11-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Buffers:         16020 kB  
11-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Cached:          82508 kB  
11-30 08:05:14.807: INFO/-SystemInfo-(1519): ---SwapCached:         64 kB  
11-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Active:         137104 kB  
11-30 08:05:14.807: INFO/-SystemInfo-(1519): ---Inactive:        41056 kB  
11-30 08:05:14.807: INFO/-SystemInfo-(1519): ---SwapTotal:       65528 kB  
11-30 08:05:14.817: INFO/-SystemInfo-(1519): ---SwapFree:        65368 kB  
11-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Dirty:              88 kB  
11-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Writeback:           0 kB  
11-30 08:05:14.817: INFO/-SystemInfo-(1519): ---AnonPages:       79672 kB  
11-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Mapped:          38296 kB  
11-30 08:05:14.817: INFO/-SystemInfo-(1519): ---Slab:             5768 kB  
11-30 08:05:14.817: INFO/-SystemInfo-(1519): ---SReclaimable:     1856 kB  
11-30 08:05:14.827: INFO/-SystemInfo-(1519): ---SUnreclaim:       3912 kB  
11-30 08:05:14.827: INFO/-SystemInfo-(1519): ---PageTables:       8184 kB  
11-30 08:05:14.827: INFO/-SystemInfo-(1519): ---NFS_Unstable:        0 kB  
11-30 08:05:14.827: INFO/-SystemInfo-(1519): ---Bounce:              0 kB  
11-30 08:05:14.827: INFO/-SystemInfo-(1519): ---CommitLimit:    167964 kB  
11-30 08:05:14.827: INFO/-SystemInfo-(1519): ---Committed_AS: 11771920 kB  
11-30 08:05:14.827: INFO/-SystemInfo-(1519): ---VmallocTotal:   761856 kB  
11-30 08:05:14.827: INFO/-SystemInfo-(1519): ---VmallocUsed:     83656 kB  
11-30 08:05:14.827: INFO/-SystemInfo-(1519): ---VmallocChunk:   674820 kB 

獲取當前剩余內存(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;  
        }  

注意類型，不然相乘之後會有溢出。可用內部存儲的大小不能通過getRootDirectory();取得，

網上傳的很多都是用getRootDirectory()取得的，我測試之後發現取得的數值不對。要根據getDataDirectory();取得。

三、sdCard大小 注意類型，不然相乘之後會有溢出。

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;//總大小  
            sdCardInfo[1] = bSize * availBlocks;//可用大小  
        }  
        return sdCardInfo;  
    } 

四、電池電量

private BroadcastReceiver batteryReceiver=new BroadcastReceiver(){  
        @Override  
        public void onReceive(Context context, Intent intent) {  
            int level = intent.getIntExtra("level", 0);  
            //  level加%就是當前電量了  
    }  
};

然後在activity的oncreate()方法中注冊

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

五、CPU信息 : /proc/cpuinfo文件中第一行是CPU的型號，第二行是CPU的頻率

    adb shell                       (connect to your Android device shell)

    cat /proc/cpuinfo               (read the CPU info)

private String getInfo() {

    StringBuffer sb = new StringBuffer();

    sb.append("abi: ").append(Build.CPU_ABI).append("\n");

    if (new File("/proc/cpuinfo").exists()) {

        try {

            BufferedReader br = new BufferedReader(new FileReader(new File("/proc/cpuinfo")));

            String aLine;

            while ((aLine = br.readLine()) != null) {

                sb.append(aLine + "\n");

            }

            if (br != null) {

                br.close();

            }

        } catch (IOException e) {

            e.printStackTrace();

        } 

    }

    return sb.toString();

}

六、系統的版本信息：

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;  
} 

版本信息裡面還包括型號等信息。

七、MAC地址和開機時間：

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);  
} 

最後貼一個格式化數據的方法： 保留兩位小數。

    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();  
    }