foreword
This article mainly explains the basic information acquisition methods of Android devices, the main contents include the following items:
- Basic information about the screen, including screen size and density
- CPU frequency information, including maximum frequency, minimum frequency and current frequency
- Number of CPU cores
- CPU architecture, supported instruction sets
- Detailed and complete information of the CPU
- Equipment Model
- Android system version
- RAM size, SD storage size
1. Basic screen information
The main purpose is to obtain the size and screen density, which can be obtained through WindowManager. The sample code is as follows:
/**
* 获取屏幕信息（分辨率、密度）
*/
public static String getScreenInfo(Context context) {
String screen = "";
String density = ""; //屏幕密度
String resolution = ""; // 屏幕分辨率
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics dm = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(dm);
density = String.valueOf(dm.density); // 屏幕密度（0.75 / 1.0 / 1.5 / 2.0）
resolution = String.valueOf(dm.heightPixels) + "*" + String.valueOf(dm.widthPixels);
screen = "屏幕分辨率： " + resolution + "， 屏幕密度： " + density;
return screen;
}
2. CPU frequency information
Sample code:
/**
* 获取CPU最大频率
*
* @return
*/
// "/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
*
* @return
*/
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();
}
/**
* 获取CPU当前频率
*
* @return
*/
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;
}
3. Number of CPU cores
Sample code:
/**
* 获取CPU核心数
*
* @return
*/
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;
}
}
4. CPU architecture
Sample code:
/**
* 获取CPU架构信息,支持的指令集
* @return
*/
public static String getCPUStruct() {
String[] abis = new String[]{};
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
abis = Build.SUPPORTED_ABIS;
} else {
abis = new String[]{Build.CPU_ABI, Build.CPU_ABI2};
}
StringBuilder abiStr = new StringBuilder();
for (String abi : abis) {
abiStr.append(abi);
abiStr.append(';');
}
return abiStr.toString();
}
5. CPU Details
Sample code:
/**
* 获取CPU完整信息
* @return
*/
public static String getCpuINfo() {
try {
FileReader fr = new FileReader("/proc/cpuinfo");
BufferedReader br = new BufferedReader(fr);
String result = "";
String text = "";
while (( text = br.readLine()) != null) {
LogUtil.INSTANCE.d(text);
result += text + "\n";
}
return result;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
6. Equipment Model
Sample code:
/**
* 获取手机Model型号
*/
public static String getModel() {
return MANUFACTURER + " " + MODEL;
}
7. Android system version
Sample code:
/**
* 获取OS信息，全称
*/
public static String getOsInfo() {
return "Android " + Build.VERSION.RELEASE;
}
8. RAM size, SD storage size
Sample code:
/**
* 获取内存信息
*
* @return
*/
public static String getMemoryInfo(Context context) {
//获取运行内存的信息
ActivityManager manager = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
ActivityManager.MemoryInfo info = new ActivityManager.MemoryInfo();
manager.getMemoryInfo(info);
StringBuilder sb = new StringBuilder();
sb.append("可用RAM:");
sb.append(info.availMem + "B");
sb.append(",总RAM:");
sb.append(info.totalMem + "B");
sb.append("\r\n");
sb.append(Formatter.formatFileSize(context, info.availMem));
sb.append(",");
sb.append(Formatter.formatFileSize(context, info.totalMem));
return sb.toString();
}
/**
* 获取剩余SD卡存储空间的大小
*
* @return
*/
public static String getAvailSDSize(Context context) {
try {
//首先指定需要获取大小的目录
File path = Environment.getExternalStorageDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
//得到可用区块
long availableBlocks = stat.getAvailableBlocks();
long availsd = blockSize * availableBlocks;
return Formatter.formatFileSize(context, availsd);
} catch (Exception e) {
}
return "get no data";
}
/**
* 获取全部SD卡存储空间大小
*
* @return
*/
public static String getAllSDSize(Context context) {
try {
//首先指定需要获取大小的目录
File path = Environment.getExternalStorageDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
//得到全部区块
long availableBlocks = stat.getBlockCount();
long availsd = blockSize * availableBlocks;
return Formatter.formatFileSize(context, availsd);
} catch (Exception e) {
}
return "get no data";
}