Detailed explanation of how Android can obtain information about the cpu, memory, version, and power of the system

Android obtains information about the cpu, memory, version, and power of the system. 1. CPU frequency and CPU information:/proc/cpuinfo and/proc/stat.
By reading the file/proc/cpuinfo system CPU type and other information.
Read/proc/stat all CPU activity information to calculate CPU usage

The following describes how to obtain the CPU frequency through code:

Copy codeThe Code is as follows: 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 {
// Obtain the maximum CPU frequency (unit: KHZ)
// "/System/bin/cat" command line
// "/Sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq" Path of the file storing the maximum frequency
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/";
}
Return result. trim ();
}
// Obtain the Minimum CPU frequency (unit: 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/";
}
Return result. trim ();
}
// Obtain the current CPU frequency in real time (unit: KHZ)
Public static String getCurCpuFreq (){
String result = "N/";
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;
}
// Obtain the CPU name
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;
}
}

2. Memory:/proc/meminfo
Copy codeThe Code is as follows: 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 size
Copy codeThe Code is as follows: 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 size
Copy codeThe Code is as follows: 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; // total size
SdCardInfo [1] = bSize * availBlocks; // available size
}
Return sdCardInfo;
}

5. battery power
Copy codeThe Code is as follows: private BroadcastReceiver batteryReceiver = new BroadcastReceiver (){

@ Override
Public void onReceive (Context context, Intent intent ){
Int level = intent. getIntExtra ("level", 0 );
// Level plus % is the current power
}
};
RegisterReceiver (batteryReceiver, new IntentFilter (Intent. ACTION_BATTERY_CHANGED ));

6. System Version Information
Copy codeThe Code is as follows: public String [] getVersion (){
String [] version = {"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 address and boot time
Copy codeThe Code is as follows: 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 );
}