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copied!<p>This problem piss me off. I am re-using this same code that works on other project/class but not on my current project. All I did was change the variable (POST values and EditText names). But it did not work.</p> <pre><code>import java.util.ArrayList; import java.util.List; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.apache.http.protocol.HTTP; import org.apache.http.util.EntityUtils; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; import android.view.Window; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import android.preference.PreferenceManager; import android.content.SharedPreferences; public class LoginActivity extends BaseActivity implements OnClickListener { private SharedPreferences settings; private EditText email; private EditText epassword; private EditText password2; private EditText mobile; private EditText eusername; private EditText txtMessage; private Button sendBtn; //private String uriAPI =getString(R.string.loginurl); protected static final int REFRESH_DATA = 0x00000001; Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case REFRESH_DATA: String result = null; if (msg.obj instanceof String) result = (String) msg.obj; if (result != null) Toast.makeText(LoginActivity.this, result, Toast.LENGTH_LONG).show(); break; } } }; @Override public void onCreate(Bundle savedInstanceState) { requestWindowFeature(Window.FEATURE_NO_TITLE); super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); eusername = (EditText) findViewById(R.id.musername); epassword = (EditText) findViewById(R.id.mpassword); sendBtn = (Button) findViewById(R.id.loginnow_btn); if (sendBtn != null) { sendBtn.setOnClickListener(this); } } @Override public void onClick(View v) { //Toast.makeText(LoginActivity.this,"Button Clicked!", Toast.LENGTH_LONG).show(); if (v == sendBtn) { String err= null; final String dusername = eusername.getEditableText().toString(); final String dpassword = epassword.getEditableText().toString(); Toast.makeText(LoginActivity.this, dusername, Toast.LENGTH_SHORT).show(); if (dusername.isEmpty()) { err = err + "Please Enter Email"; } else if (dpassword.isEmpty()) { err = err + "Please enter password"; } if (err==null) { Toast.makeText(LoginActivity.this, "About to run sendPostRunnable", Toast.LENGTH_LONG).show(); Thread gt = new Thread(new sendPostRunnable(dusername,dpassword)); gt.start(); } else { Toast.makeText(LoginActivity.this, err, Toast.LENGTH_LONG).show(); } } } class sendPostRunnable implements Runnable { String strTxt = null; String eusername = null; String epassword = null; public sendPostRunnable(String username, String password) { this.epassword = password; this.eusername = username; Toast.makeText(LoginActivity.this,this.eusername, Toast.LENGTH_SHORT).show(); Toast.makeText(LoginActivity.this,this.epassword, Toast.LENGTH_SHORT).show(); } @Override public void run() { Toast.makeText(LoginActivity.this,"SendPostDataToInternet entrance", Toast.LENGTH_LONG).show(); String result = sendPostDataToInternet(eusername, epassword); //Toast.makeText(LoginActivity.this,"SendPostDataToInternet running", Toast.LENGTH_LONG).show(); //Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show(); mHandler.obtainMessage(REFRESH_DATA, result).sendToTarget(); //Toast.makeText(LoginActivity.this,"Obtainmessaged", Toast.LENGTH_LONG).show(); } } private String sendPostDataToInternet(String username, String password) { String uriAPI =getString(R.string.loginurl); HttpPost httpRequest = new HttpPost(uriAPI); List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("email", username)); params.add(new BasicNameValuePair("password", password)); Toast.makeText(LoginActivity.this,"TT", Toast.LENGTH_LONG).show(); try { httpRequest.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8)); HttpResponse httpResponse = new DefaultHttpClient() .execute(httpRequest); if (httpResponse.getStatusLine().getStatusCode() == 200) { String strResult = EntityUtils.toString(httpResponse .getEntity()); return strResult; } } catch (Exception e) { e.printStackTrace(); } return null; } } </code></pre> <p>During debugging I realize the problem lies on the </p> <pre><code>gt.start(); </code></pre> <p>Here is a log</p> <pre><code>03-06 02:39:35.134: E/AndroidRuntime(1916): FATAL EXCEPTION: Thread-140 03-06 02:39:35.134: E/AndroidRuntime(1916): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 03-06 02:39:35.134: E/AndroidRuntime(1916): at android.os.Handler.<init>(Handler.java:197) 03-06 02:39:35.134: E/AndroidRuntime(1916): at android.os.Handler.<init>(Handler.java:111) 03-06 02:39:35.134: E/AndroidRuntime(1916): at android.widget.Toast$TN.<init>(Toast.java:324) 03-06 02:39:35.134: E/AndroidRuntime(1916): at android.widget.Toast.<init>(Toast.java:91) 03-06 02:39:35.134: E/AndroidRuntime(1916): at android.widget.Toast.makeText(Toast.java:238) 03-06 02:39:35.134: E/AndroidRuntime(1916): at com.pbd.b_prototype.LoginActivity$sendPostRunnable.run(LoginActivity.java:162) 03-06 02:39:35.134: E/AndroidRuntime(1916): at java.lang.Thread.run(Thread.java:856) </code></pre>

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