关于获取wifi密码或者访问/data/misc/wifi/×.conf的权限

Leafact 2015-04-27 02:16:07

想获得wifi密码的明文，我从两个方向入手，但都遇到了困难
1.我想利用wifiManager获得getConfiguration的列表
代码如下

WifiManager manager=(WifiManager) getSystemService(WIFI_SERVICE);

		List<WifiConfiguration> wifis=manager.getConfiguredNetworks();

		StringBuffer sb=new StringBuffer();

		for(WifiConfiguration temp : wifis)

		{

			sb.append(temp.preSharedKey+'\n');

		}

但是，我在查阅资料是发现，preSharedKey已经改变了，我看11年的帖子这个方法是可以成功应该（百度看的）
api说明preSharedKey
/**
* Pre-shared key for use with WPA-PSK.
* <p/>
* When the value of this key is read, the actual key is
* not returned, just a "*" if the key has a value, or the null
* string otherwise.
*/
返回的竟然是‘×’

另外一种方法是去读文件访问，但是肯定是权限不够的，网上查了一段代码

public StringBuffer read() throws Exception {

		Process process = null;

		DataOutputStream dataOutputStream = null;

		DataInputStream dataInputStream = null;

		StringBuffer wifiConf = new StringBuffer();

		try {

			process = Runtime.getRuntime().exec("su");

			dataOutputStream = new DataOutputStream(process.getOutputStream());

			dataInputStream = new DataInputStream(process.getInputStream());

			dataOutputStream.writeBytes("cat /data/misc/wifi/*.conf\n");

			dataOutputStream.writeBytes("exit\n");

			dataOutputStream.flush();

			InputStreamReader inputStreamReader = new InputStreamReader(

					dataInputStream, "UTF-8");

			BufferedReader bufferedReader = new BufferedReader(

					inputStreamReader);

			String line = null;

			while ((line = bufferedReader.readLine()) != null) {

				wifiConf.append(line);

			}

			bufferedReader.close();

			inputStreamReader.close();

			process.waitFor();

		} catch (Exception e) {

			throw e;

		} finally {

			try {

				if (dataOutputStream != null) {

					dataOutputStream.close();

				}

				if (dataInputStream != null) {

					dataInputStream.close();

				}

				process.destroy();

			} catch (Exception e) {

				throw e;

			}

		}

		StringBuffer sb = new StringBuffer();

		Pattern network = Pattern.compile("network=\\{([^\\}]+)\\}",

				Pattern.DOTALL);

		Matcher networkMatcher = network.matcher(wifiConf.toString());

		while (networkMatcher.find()) {

			String networkBlock = networkMatcher.group();

			Pattern ssid = Pattern.compile("ssid=\"([^\"]+)\"");

			Matcher ssidMatcher = ssid.matcher(networkBlock);

			if (ssidMatcher.find()) {

				sb.append(ssidMatcher.group(1));

				Pattern psk = Pattern.compile("psk=\"([^\"]+)\"");

				Matcher pskMatcher = psk.matcher(networkBlock);

				if (pskMatcher.find()) {

					sb.append(pskMatcher.group(1));

				} else {

					sb.append("无密码" + "/n");

				}

			}

		}

		return sb;

	}

但是利用这个代码运行也会报错，log中显示空指针异常
04-27 06:14:27.316: W/System.err(3470): java.lang.NullPointerException: Attempt to invoke virtual method 'void java.lang.Process.destroy()' on a null object reference
那么问题来了，应用app如何访问那些文件呢，求指导

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