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    <p>So first the Android stuff: You're getting this <code>NetworkOnMainThreadException</code> because you're trying to make a HTTP request on your main application thread which is the UI thread. You shouldn't do any blocking operations in this thread. Use an <a href="https://developer.android.com/reference/android/os/AsyncTask.html" rel="nofollow">AsyncTask</a> instead.</p> <p>I'm not quite sure what's causing the <code>IllegalArgumentException</code> but I guess it's this line:</p> <pre><code>response = CustomHttpClient.executeHttpPost("http://127.0.0.1/es/check.php", postParameters); </code></pre> <p>You have probably changed the URL (localhost usually doesn't make sense on a phone). The scheme part is the <code>http</code>. Maybe you have something like <code>" http://..."</code> (note the leading space character) in the original code?</p> <p>Short note on the PHP:</p> <pre><code>$sql = 'SELECT * from people WHERE username = "' .$_POST['un'] . '" and password = "' .md5($_POST['pw']) . '"'; </code></pre> <p>That's what you call an <a href="http://en.wikipedia.org/wiki/SQL_injection" rel="nofollow">SQL injection</a>.</p> <p><strong>Update:</strong> Here's some example. Didn't test it, hopefully it works.</p> <pre><code>public class LoginLayout extends Activity { EditText un,pw; TextView error; Button ok; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); un=(EditText)findViewById(R.id.et_un); pw=(EditText)findViewById(R.id.et_pw); ok=(Button)findViewById(R.id.btn_login); error=(TextView)findViewById(R.id.tv_error); ok.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { new LoginTask().execute(un.getText().toString(), pw.getText().toString()); } }); } private class LoginTask extends AsyncTask&lt;String, Void, Object&gt; { protected Object doInBackground(String... params) { ArrayList&lt;NameValuePair&gt; postParameters = new ArrayList&lt;NameValuePair&gt;(); postParameters.add(new BasicNameValuePair("username", params[0])); postParameters.add(new BasicNameValuePair("password", params[1])); String response = null; try { response = CustomHttpClient.executeHttpPost("http://127.0.0.1/es/check.php", postParameters); String res = response.toString(); res = res.replaceAll("\\s+",""); return res; } catch (Exception e) { return e; } } protected void onPostExecute(Object result) { if (result instanceof String) { if (result.equals("1")) { error.setText("Correct Username or Password"); } else { error.setText("Sorry!! Wrong Username or Password Entered"); } } else if (result instanceof Exception) { un.setText(result.toString()); } } } } </code></pre>
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    1. POjava.lang.IllegalArgumentException: Illegal character in scheme at index 0: AND android.os.NetworkOnMainThreadException
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    1. COI've added some code. Hopefully it works ;)
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    2. COThanks Julian...I try it already but its gt error at the last paragraph: else if (result instanceof Exception) { un.setText(e.toString()); } at the (e.toString());
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    3. COOh right, it has to be result.toString().
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