获取系统版本内核版本信息

private static final String LOG_TAG = "DeviceInfoSettings";
	private static final String FILENAME_PROC_VERSION = "/proc/version";
	private String readLine(String filename) throws IOException {
		BufferedReader reader = new BufferedReader(new FileReader(filename), 256);
		try {
			return reader.readLine();
		} finally {
			reader.close();
		}
	}
	//内核版本
	private String getFormattedKernelVersion() {
		String procVersionStr;
		try {
			procVersionStr = readLine(FILENAME_PROC_VERSION);

			final String PROC_VERSION_REGEX =
					"\\w+\\s+" + /* ignore: Linux */
					"\\w+\\s+" + /* ignore: version */
					"([^\\s]+)\\s+" + /* group 1: 2.6.22-omap1 */
					"\\(([^\\s@]+(?:@[^\\s.]+)?)[^)]*\\)\\s+" + /* group 2: ([email protected]) */
					"\\((?:[^(]*\\([^)]*\\))?[^)]*\\)\\s+" + /* ignore: (gcc ..) */
					"([^\\s]+)\\s+" + /* group 3: #26 */
					"(?:PREEMPT\\s+)?" + /* ignore: PREEMPT (optional) */
					"(.+)"; /* group 4: date */

			Pattern p = Pattern.compile(PROC_VERSION_REGEX);
			Matcher m = p.matcher(procVersionStr);

			if (!m.matches()) {
				Log.e(LOG_TAG, "Regex did not match on /proc/version: " + procVersionStr);
				return "Unavailable";
			} else if (m.groupCount() < 4) {
				Log.e(LOG_TAG, "Regex match on /proc/version only returned " + m.groupCount()
						+ " groups");
				return "Unavailable";
			} else {
				return (new StringBuilder(m.group(1)).append("\n").append(
						m.group(2)).append(" ").append(m.group(3)).append("\n")
						.append(m.group(4))).toString();
			}
		} catch (IOException e) {
			Log.e(LOG_TAG,
					"IO Exception when getting kernel version for Device Info screen",
					e);

			return "Unavailable";
		}
	}
	public void showIntroduceDialog(){ 
		AlertDialog.Builder builder = new AlertDialog.Builder(this); 
		builder.setTitle("系统信息"); 
		StringBuilder sb = new StringBuilder(); 
		sb.append("SDK版本信息："+Build.VERSION.SDK+"\n\n"); 
		sb.append("Android版本信息："+android.os.Build.VERSION.RELEASE+"\n\n"); 
		sb.append("内核版本信息:"+getFormattedKernelVersion()+"\n\n");
		builder.setMessage(sb.toString()); 
		builder.setNegativeButton("确定", null); 
		builder.create().show(); 
	}