having error when trying to MYSQL server in Android
Question
hello i am learning to connect android application with MYSQL using this tutorial.. Tutorial
i want to login and add some comments to the MYSQL database in my hosting. i have done all the steps correctly. but when i try to load the application in the phone .that say "unfortunately the MYSQL has stopped working" and gives me the following error. can some one help me to fix this error please. thank you....
Full error stack
02-08 15:21:43.578: E/AndroidRuntime(9705): FATAL EXCEPTION: AsyncTask #1
02-08 15:21:43.578: E/AndroidRuntime(9705): java.lang.RuntimeException: An error occured while executing doInBackground()
02-08 15:21:43.578: E/AndroidRuntime(9705): at android.os.AsyncTask$3.done(AsyncTask.java:299)
02-08 15:21:43.578: E/AndroidRuntime(9705): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
02-08 15:21:43.578: E/AndroidRuntime(9705): at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
02-08 15:21:43.578: E/AndroidRuntime(9705): at java.util.concurrent.FutureTask.run(FutureTask.java:239)
02-08 15:21:43.578: E/AndroidRuntime(9705): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
02-08 15:21:43.578: E/AndroidRuntime(9705): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
02-08 15:21:43.578: E/AndroidRuntime(9705): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
02-08 15:21:43.578: E/AndroidRuntime(9705): at java.lang.Thread.run(Thread.java:838)
02-08 15:21:43.578: E/AndroidRuntime(9705): Caused by: java.lang.NullPointerException
02-08 15:21:43.578: E/AndroidRuntime(9705): at lk.adspace.mysqltest.Login$AttemptLogin.doInBackground(Login.java:141)
02-08 15:21:43.578: E/AndroidRuntime(9705): at lk.adspace.mysqltest.Login$AttemptLogin.doInBackground(Login.java:1)
02-08 15:21:43.578: E/AndroidRuntime(9705): at android.os.AsyncTask$2.call(AsyncTask.java:287)
02-08 15:21:43.578: E/AndroidRuntime(9705): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
02-08 15:21:43.578: E/AndroidRuntime(9705): ... 4 more
02-08 15:21:43.928: D/OpenGLRenderer(9705): Flushing caches (mode 0)
02-08 15:21:43.985: D/OpenGLRenderer(9705): Flushing caches (mode 0)
02-08 15:21:44.342: D/OpenGLRenderer(9705): Flushing caches (mode 1)
02-08 15:21:44.345: D/InputMethodManager(9705): deactivate the inputconnection in ControlledInputConnectionWrapper.
02-08 15:21:44.355: D/OpenGLRenderer(9705): Flushing caches (mode 0)
02-08 15:21:44.363: E/WindowManager(9705): Activity lk.adspace.mysqltest.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{41344e60 V.E..... R......D 0,0-456,144} that was originally added here
02-08 15:21:44.363: E/WindowManager(9705): android.view.WindowLeaked: Activity lk.adspace.mysqltest.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{41344e60 V.E..... R......D 0,0-456,144} that was originally added here
02-08 15:21:44.363: E/WindowManager(9705): at android.view.ViewRootImpl.<init> (ViewRootImpl.java:409)
02-08 15:21:44.363: E/WindowManager(9705): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:218)
02-08 15:21:44.363: E/WindowManager(9705): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:70)
02-08 15:21:44.363: E/WindowManager(9705): at android.app.Dialog.show(Dialog.java:281)
02-08 15:21:44.363: E/WindowManager(9705): at lk.adspace.mysqltest.Login$AttemptLogin.onPreExecute(Login.java:110)
02-08 15:21:44.363: E/WindowManager(9705): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
02-08 15:21:44.363: E/WindowManager(9705): at android.os.AsyncTask.execute(AsyncTask.java:534)
02-08 15:21:44.363: E/WindowManager(9705): at lk.adspace.mysqltest.Login.onClick(Login.java:83)
02-08 15:21:44.363: E/WindowManager(9705): at android.view.View.performClick(View.java:4212)
02-08 15:21:44.363: E/WindowManager(9705): at android.view.View$PerformClick.run(View.java:17476)
02-08 15:21:44.363: E/WindowManager(9705): at android.os.Handler.handleCallback(Handler.java:800)
02-08 15:21:44.363: E/WindowManager(9705): at android.os.Handler.dispatchMessage(Handler.java:100)
02-08 15:21:44.363: E/WindowManager(9705): at android.os.Looper.loop(Looper.java:194)
02-08 15:21:44.363: E/WindowManager(9705): at android.app.ActivityThread.main(ActivityThread.java:5371)
02-08 15:21:44.363: E/WindowManager(9705): at java.lang.reflect.Method.invokeNative(Native Method)
02-08 15:21:44.363: E/WindowManager(9705): at java.lang.reflect.Method.invoke(Method.java:525)
02-08 15:21:44.363: E/WindowManager(9705): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
02-08 15:21:44.363: E/WindowManager(9705): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
02-08 15:21:44.363: E/WindowManager(9705): at dalvik.system.NativeStart.main(Native Method)
02-08 15:21:44.364: D/OpenGLRenderer(9705): Flushing caches (mode 0)
here is my login.java file
package lk.adspace.mysqltest;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class Login extends Activity implements OnClickListener{
private EditText user, pass;
private Button mSubmit, mRegister;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
//php login script location:
//localhost :
//testing on your device
//put your local ip instead, on windows, run CMD > ipconfig
//or in mac's terminal type ifconfig and look for the ip under en0 or en1
// private static final String LOGIN_URL = "http://xxx.xxx.x.x:1234/webservice/login.php";
//testing on Emulator:
private static final String LOGIN_URL = "http://www.adspace.lk/webservice/login.php";
//testing from a real server:
//private static final String LOGIN_URL = "http://www.yourdomain.com/webservice/login.php";
//JSON element ids from repsonse of php script:
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
//setup input fields
user = (EditText)findViewById(R.id.username);
pass = (EditText)findViewById(R.id.password);
//setup buttons
mSubmit = (Button)findViewById(R.id.login);
mRegister = (Button)findViewById(R.id.register);
//register listeners
mSubmit.setOnClickListener(this);
mRegister.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.login:
new AttemptLogin().execute();
break;
case R.id.register:
Intent i = new Intent(this, Register.class);
startActivity(i);
break;
default:
break;
}
}
class AttemptLogin extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
boolean failure = false;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Login.this);
pDialog.setMessage("Attempting login...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
// Check for success tag
int success;
String username = user.getText().toString();
String password = pass.getText().toString();
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", username));
params.add(new BasicNameValuePair("password", password));
Log.d("request!", "starting");
// getting product details by making HTTP request
JSONObject json = jsonParser.makeHttpRequest(
LOGIN_URL, "POST", params);
// check your log for json response
Log.d("Login attempt", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Log.d("Login Successful!", json.toString());
// save user data
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(Login.this);
Editor edit = sp.edit();
edit.putString("username", username);
edit.commit();
//Intent i = new Intent(Login.this, ReadComments.class);
//finish();
//startActivity(i);
return json.getString(TAG_MESSAGE);
} else {
Log.d("Login Failure!", json.getString(TAG_MESSAGE));
return json.getString(TAG_MESSAGE);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product deleted
pDialog.dismiss();
if (file_url != null){
Toast.makeText(Login.this, file_url, Toast.LENGTH_LONG).show();
}
Intent i = new Intent(Login.this, ReadComments.class);
finish();
startActivity(i);
}
}
}
JSONParser.java file
package lk.adspace.mysqltest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
public JSONObject makeHttpRequest(String loginUrl, String string,
List<NameValuePair> params) {
// TODO Auto-generated method stub
return null;
}
}
Manifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="lk.adspace.mysqltest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="lk.adspace.mysqltest.Login"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="lk.adspace.mysqltest.Register"
android:label="@string/app_name" >
</activity>
<activity
android:name="lk.adspace.mysqltest.AddComment"
android:label="@string/app_name" >
</activity>
<activity
android:name="lk.adspace.mysqltest.ReadComments"
android:label="@string/app_name" >
</activity>
</application>
</manifest>
1 answers
solution1
0 2014-02-08 09:25:22
Start your new activity on onPostExecute method instead on doInBackground
@Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
// Check for success tag
int success;
String username = user.getText().toString();
String password = pass.getText().toString();
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", username));
params.add(new BasicNameValuePair("password", password));
Log.d("request!", "starting");
// getting product details by making HTTP request
JSONObject json = jsonParser.makeHttpRequest(
LOGIN_URL, "POST", params);
// check your log for json response
Log.d("Login attempt", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Log.d("Login Successful!", json.toString());
// save user data
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(Login.this);
Editor edit = sp.edit();
edit.putString("username", username);
edit.commit();
return json.getString(TAG_MESSAGE);
} else {
Log.d("Login Failure!", json.getString(TAG_MESSAGE));
return json.getString(TAG_MESSAGE);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product deleted
pDialog.dismiss();
if (file_url != null){
Toast.makeText(Login.this, file_url, Toast.LENGTH_LONG).show();
}
Intent i = new Intent(Login.this, ReadComments.class);
finish();
startActivity(i);
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