Android获取系统cpu信息，内存，版本，电量等信息

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：

复制代码 代码如下:

package com.orange.cpu

import java.io.BufferedReader

import java.io.FileNotFoundException

import java.io.FileReader

import java.io.IOException

import java.io.InputStream

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 = 0i <array.lengthi++) {

}

return array[1]

} catch (FileNotFoundException e) {

e.printStackTrace()

} catch (IOException e) {

e.printStackTrace()

}

return null

}

}

2、内存：/proc/meminfo

复制代码 代码如下:

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

复制代码 代码如下:

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

复制代码 代码如下:

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

复制代码 代码如下:

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

复制代码 代码如下:

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

复制代码 代码如下:

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)

}

因为Android本质上是linux系统,所以关系硬件相关的信息实际上是用文件表示的

CPU相关信息放在 /sys/devices/system/cpu/ 这个路径下,

要知道cpu的核数只需要查看这个路径中的文件即可

如果CPU是双核的,则 /sys/devices/system/cpu/ 路径下有两个子文件夹 cpu0 和 cpu1

如果CPU是四核的,则 /sys/devices/system/cpu/ 路径下有四个子文件夹 cpu0 和 cpu1 和 cpu2 和 cpu3

以此类推

这个是抄来的

获取 CPU 核数Linux 中的设备都是以文件的形式存在，CPU 也不例外，因此 CPU 的文件个数就等价与核数。Android 的 CPU 设备文件位于/sys/devices/system/cpu/目录，文件名的的格式为cpu\d+。root@generic_x86_64:/sys/devices/system/cpu # ls cpu0 cpufreqcpuidlekernel_maxmodaliasofflineonlinepossiblepowerpresentuevent统计一下文件个数便可以获得 CPU 核数。public static int getNumberOfCPUCores() { if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.GINGERBREAD_MR1) {// Gingerbread doesn't support giving a single application access to both cores, but a// handful of devices (Atrix 4G and Droid X2 for example) were released with a dual-core// chipset and Gingerbreadthat can let an app in the background run without impacting// the foreground application. But for our purposes, it makes them single core.return 1 } int cores try {cores = new File("/sys/devices/system/cpu/").listFiles(CPU_FILTER).length } catch (SecurityException e) {cores = DEVICEINFO_UNKNOWN } catch (NullPointerException e) {cores = DEVICEINFO_UNKNOWN } return cores}private static final FileFilter CPU_FILTER = new FileFilter() { @Override public boolean accept(File pathname) {String path = pathname.getName()//regex is slow, so checking char by char.if (path.startsWith("cpu")) { for (int i = 3i <path.length()i++) {if (path.charAt(i) <'0' path.charAt(i) >'9') { return false} } return true}return false }}获取时钟频率获取时钟频率需要读取系统文件 -/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq或者/proc/cpuinfo。 Android 模拟器中并没有cpuinfo_max_freq文件，因此只能读取/proc/cpuinfo。/proc/cpuinfo包含了很多 cpu 数据。processor: 0vendor_id: GenuineIntelcpu family: 6model: 70model name: Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHzstepping: 1cpu MHz: 0.000cache size: 1024 KBfdiv_bug: nohlt_bug: nof00f_bug: nocoma_bug: nofpu: yesfpu_exception: yescpuid level: 4wp: yes代码如下：public static int getCPUMaxFreqKHz() { int maxFreq = DEVICEINFO_UNKNOWN try {for (int i = 0i <getNumberOfCPUCores()i++) { String filename = "/sys/devices/system/cpu/cpu" + i + "/cpufreq/cpuinfo_max_freq" File cpuInfoMaxFreqFile = new File(filename) if (cpuInfoMaxFreqFile.exists()) {byte[] buffer = new byte[128]FileInputStream stream = new FileInputStream(cpuInfoMaxFreqFile)try { stream.read(buffer) int endIndex = 0 //Trim the first number out of the byte buffer. while (buffer[endIndex] >= '0' &&buffer[endIndex] <= '9' &&endIndex <buffer.length) endIndex++ String str = new String(buffer, 0, endIndex) Integer freqBound = Integer.parseInt(str) if (freqBound >maxFreq) maxFreq = freqBound} catch (NumberFormatException e) { //Fall through and use /proc/cpuinfo.} finally { stream.close()} }}if (maxFreq == DEVICEINFO_UNKNOWN) { FileInputStream stream = new FileInputStream("/proc/cpuinfo") try {int freqBound = parseFileForValue("cpu MHz", stream)freqBound *= 1000//MHz ->kHzif (freqBound >maxFreq) maxFreq = freqBound } finally {stream.close() }} } catch (IOException e) {maxFreq = DEVICEINFO_UNKNOWN//Fall through and return unknown. } return maxFreq}获取内存大小如果 SDK 版本大于等于JELLY_BEAN，可以通过ActivityManager来获取内从大小。ActivityManager.MemoryInfo memInfo = new ActivityManager.MemoryInfo()ActivityManager am = (ActivityManager) c.getSystemService(Context.ACTIVITY_SERVICE)am.getMemoryInfo(memInfo)如果版本低于JELLY_BEAN，则只能读取系统文件了。FileInputStream stream = new FileInputStream("/proc/meminfo")totalMem = parseFileForValue("MemTotal", stream)完整代码如下：@TargetApi(Build.VERSION_CODES.JELLY_BEAN)public static long getTotalMemory(Context c) { // memInfo.totalMem not supported in pre-Jelly Bean APIs. if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {ActivityManager.MemoryInfo memInfo = new ActivityManager.MemoryInfo()ActivityManager am = (ActivityManager) c.getSystemService(Context.ACTIVITY_SERVICE)am.getMemoryInfo(memInfo)if (memInfo != null) { return memInfo.totalMem} else { return DEVICEINFO_UNKNOWN} } else {long totalMem = DEVICEINFO_UNKNOWNtry { FileInputStream stream = new FileInputStream("/proc/meminfo") try {totalMem = parseFileForValue("MemTotal", stream)totalMem *= 1024 } finally {stream.close() }} catch (IOException e) {}return totalMem }}

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