android，在文件中找一个String

private String getVersion(String key) {

if (new File("/etc/version.conf").exists()) {

try {

BufferedReader reader = new BufferedReader(new FileReader(

"/etc/version.conf"), 1024);

String a = "";

try {

while ((a = reader.readLine()) != null) {

if (a.indexOf(key) != -1) {// || a.indexOf(key2) != -1

return a.substring(a.indexOf(',') + 1, a.length());

}

}

} finally {

reader.close();

}

} catch (IOException e) {

Log.e("SDAC",

"IO Exception when getting kernel version for Device Info screen",

e);

}

}

return "";

}