Android系统的CPU信息涉及到两个文件：/proc/cpuinfo和/proc/stat 

通过读取文件/proc/cpuinfo，来获取系统CPU的类型等多种信息，

通过读取/proc/stat 所有CPU活动的信息来计算CPU使用率。

// 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 = 0; i < array.length; i++) {
			}
			return array[1];
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}

2、获取CPU最大频率

// 获取CPU最大频率
	// "/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();
	}

3、获取CPU最小频率

// 获取CPU最小频率
	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();
	}

4、实时获取CPU当前频率

// 实时获取CPU当前频率
	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;
	}