前言
本文主要说明一下Android设备的基本信息获取方式，主要内容包括如下几项：
- 屏幕的基本信息，包括屏幕的尺寸及密度
- CPU的频率信息，包括最大频率，最小频率以及当前频率
- CPU核心数
- CPU的架构，支持的指令集
- CPU的详细完整信息
- 设备Model型号
- Android系统版本
- RAM大小，SD存储大小
1. 屏幕基本信息
主要是获取尺寸大小和屏幕密度，可以通过WindowManager来进行获取，示例代码如下：
/**
* 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频率信息
示例代码：
/**
* 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. CPU核心数
示例代码：
/**
* 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架构
示例代码：
/**
* 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 详细信息
示例代码：
/**
* 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. 设备Model型号
示例代码：
/**
* 获取手机Model型号
*/
public static String getModel() {
return MANUFACTURER + " " + MODEL;
}
7. Android系统版本
示例代码：
/**
* 获取OS信息，全称
*/
public static String getOsInfo() {
return "Android " + Build.VERSION.RELEASE;
}
8. RAM 大小，SD存储大小
示例代码：
/**
* 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";
}