Get the CPU temperature from an android device by using the sys/class/thermal/temp command.

GetCpuTempAndroid.java

	public float getCpuTemp() {
		Process process;
		try {
			process = Runtime.getRuntime().exec("cat sys/class/thermal/thermal_zone0/temp");
			process.waitFor();
			BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
			String line = reader.readLine();
			float temp = Float.parseFloat(line) / 1000.0f;
			return temp;
		} catch (Exception e) {
			e.printStackTrace();
			return 0.0f;
		}
	}

Thank you 👍

line = null
in my case means it is reader.readLine() is returning null