问题
I'm a beginner in android development.I have been looking for a week now. Followed all the tutorials word by word. Whenever I start my android emulator it first shows ProcessSystem isn't responding. Wait or Exit? Second the application loads but as soon as I click on the Register or Login button after filling out the form, after a few seconds of showing process dialog box, "Unfortunately the app has stopped working" is shown and it exits. My Login.java file is
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();
private static final String LOGIN_URL = "http://localhost/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> {
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());
Intent i = new Intent(Login.this, Display.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;
}
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();
}
}
}
}
And my Register.java is
public class Register extends Activity implements OnClickListener{
private EditText user, pass;
private Button mRegister;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
//php login script
private static final String LOGIN_URL = "http://localhost/webservice/register.php";
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.register);
user = (EditText)findViewById(R.id.username);
pass = (EditText)findViewById(R.id.password);
mRegister = (Button)findViewById(R.id.register);
mRegister.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new CreateUser().execute();
}
class CreateUser extends AsyncTask<String, String, String> {
boolean failure = false;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Register.this);
pDialog.setMessage("Creating User...");
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");
//Posting user data to script
JSONObject json = jsonParser.makeHttpRequest(
LOGIN_URL, "POST", params);
// full json response
Log.d("Login attempt", json.toString());
// json success element
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Log.d("User Created!", json.toString());
finish();
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;
}
protected void onPostExecute(String file_url) {
pDialog.dismiss();
if (file_url != null){
Toast.makeText(Register.this, file_url, Toast.LENGTH_LONG).show();
}
}
}
}
THe JSONParser.java file is
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(final String url) {
// Making HTTP request
try {
// Construct the client and the HTTP request.
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
// Execute the POST request and store the response locally.
HttpResponse httpResponse = httpClient.execute(httpPost);
// Extract data from the response.
HttpEntity httpEntity = httpResponse.getEntity();
// Open an inputStream with the data content.
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
// Create a BufferedReader to parse through the inputStream.
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
// Declare a string builder to help with the parsing.
StringBuilder sb = new StringBuilder();
// Declare a string to store the JSON object data in string form.
String line = null;
// Build the string until null.
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
// Close the input stream.
is.close();
// Convert the string builder data to an actual string.
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// Try to 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 the JSON Object.
return jObj;
}
// function get json from url
// by making HTTP POST or GET mehtod
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
// check for request method
if(method == "POST"){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}else if(method == "GET"){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "utf-8");
url += "?" + paramString;
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
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;
}
}
the logcat is:
05-13 06:57:20.120: D/gralloc_goldfish(1219): Emulator without GPU emulation detected.
05-13 06:57:25.540: I/Choreographer(1219): Skipped 282 frames! The application may be doing too much work on its main thread.
05-13 06:57:41.450: D/dalvikvm(1219): GC_FOR_ALLOC freed 138K, 6% free 3395K/3604K, paused 38ms, total 43ms
05-13 06:57:41.590: D/dalvikvm(1219): GC_FOR_ALLOC freed 35K, 6% free 3496K/3684K, paused 34ms, total 40ms
05-13 06:57:41.590: I/dalvikvm-heap(1219): Grow heap (frag case) to 4.085MB for 635812-byte allocation
05-13 06:57:42.280: D/request!(1219): starting
05-13 06:57:42.600: I/Choreographer(1219): Skipped 100 frames! The application may be doing too much work on its main thread.
05-13 06:57:42.770: I/Choreographer(1219): ...and 8 more
05-13 06:58:08.680: W/System.err(1219): java.net.UnknownHostException: Unable to resolve host "http": No address associated with hostname
05-13 06:58:08.800: I/Choreographer(1219): Skipped 37 frames! The application may be doing too much work on its main thread.
05-13 06:58:08.880: W/System.err(1219): at java.net.InetAddress.lookupHostByName(InetAddress.java:424)
05-13 06:58:08.880: W/System.err(1219): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
05-13 06:58:08.880: W/System.err(1219): at java.net.InetAddress.getAllByName(InetAddress.java:214)
05-13 06:58:08.970: W/System.err(1219): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
05-13 06:58:08.970: W/System.err(1219): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
05-13 06:58:08.970: W/System.err(1219): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
05-13 06:58:09.720: W/System.err(1219): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
05-13 06:58:09.720: W/System.err(1219): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
05-13 06:58:09.720: W/System.err(1219): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
05-13 06:58:09.740: W/System.err(1219): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
05-13 06:58:09.740: W/System.err(1219): at com.example.mysqltest.JSONParser.makeHttpRequest(JSONParser.java:89)
05-13 06:58:09.740: W/System.err(1219): at com.example.mysqltest.Register$CreateUser.doInBackground(Register.java:94)
05-13 06:58:10.220: W/System.err(1219): at com.example.mysqltest.Register$CreateUser.doInBackground(Register.java:1)
05-13 06:58:10.470: W/System.err(1219): at android.os.AsyncTask$2.call(AsyncTask.java:288)
05-13 06:58:10.470: W/System.err(1219): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
05-13 06:58:10.530: W/System.err(1219): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
05-13 06:58:10.530: W/System.err(1219): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
05-13 06:58:10.540: W/System.err(1219): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
05-13 06:58:10.540: W/System.err(1219): at java.lang.Thread.run(Thread.java:841)
05-13 06:58:10.540: W/System.err(1219): Caused by: libcore.io.GaiException: getaddrinfo failed: EAI_NODATA (No address associated with hostname)
05-13 06:58:10.610: I/Choreographer(1219): Skipped 47 frames! The application may be doing too much work on its main thread.
05-13 06:58:11.070: W/System.err(1219): at libcore.io.Posix.getaddrinfo(Native Method)
05-13 06:58:11.070: W/System.err(1219): at libcore.io.ForwardingOs.getaddrinfo(ForwardingOs.java:61)
05-13 06:58:11.070: W/System.err(1219): at java.net.InetAddress.lookupHostByName(InetAddress.java:405)
05-13 06:58:11.080: W/System.err(1219): ... 18 more
05-13 06:58:11.080: E/Buffer Error(1219): Error converting result java.lang.NullPointerException: lock == null
05-13 06:58:11.180: E/JSON Parser(1219): Error parsing data org.json.JSONException: End of input at character 0 of
05-13 06:58:11.180: W/dalvikvm(1219): threadid=11: thread exiting with uncaught exception (group=0xb3af1ba8)
05-13 06:58:11.420: E/AndroidRuntime(1219): FATAL EXCEPTION: AsyncTask #1
05-13 06:58:11.420: E/AndroidRuntime(1219): Process: com.example.mysqltest, PID: 1219
05-13 06:58:11.420: E/AndroidRuntime(1219): java.lang.RuntimeException: An error occured while executing doInBackground()
05-13 06:58:11.420: E/AndroidRuntime(1219): at android.os.AsyncTask$3.done(AsyncTask.java:300)
05-13 06:58:11.420: E/AndroidRuntime(1219): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
05-13 06:58:11.420: E/AndroidRuntime(1219): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
05-13 06:58:11.420: E/AndroidRuntime(1219): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
05-13 06:58:11.420: E/AndroidRuntime(1219): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
05-13 06:58:11.420: E/AndroidRuntime(1219): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
05-13 06:58:11.420: E/AndroidRuntime(1219): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
05-13 06:58:11.420: E/AndroidRuntime(1219): at java.lang.Thread.run(Thread.java:841)
05-13 06:58:11.420: E/AndroidRuntime(1219): Caused by: java.lang.NullPointerException
05-13 06:58:11.420: E/AndroidRuntime(1219): at com.example.mysqltest.Register$CreateUser.doInBackground(Register.java:97)
05-13 06:58:11.420: E/AndroidRuntime(1219): at com.example.mysqltest.Register$CreateUser.doInBackground(Register.java:1)
05-13 06:58:11.420: E/AndroidRuntime(1219): at android.os.AsyncTask$2.call(AsyncTask.java:288)
05-13 06:58:11.420: E/AndroidRuntime(1219): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
05-13 06:58:11.420: E/AndroidRuntime(1219): ... 4 more
05-13 06:58:15.100: E/WindowManager(1219): android.view.WindowLeaked: Activity com.example.mysqltest.Register has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{b3e3c660 V.E..... R.....ID 0,0-456,144} that was originally added here
05-13 06:58:15.100: E/WindowManager(1219): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:348)
05-13 06:58:15.100: E/WindowManager(1219): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248)
05-13 06:58:15.100: E/WindowManager(1219): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
05-13 06:58:15.100: E/WindowManager(1219): at android.app.Dialog.show(Dialog.java:286)
05-13 06:58:15.100: E/WindowManager(1219): at com.example.mysqltest.Register$CreateUser.onPreExecute(Register.java:77)
05-13 06:58:15.100: E/WindowManager(1219): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
05-13 06:58:15.100: E/WindowManager(1219): at android.os.AsyncTask.execute(AsyncTask.java:535)
05-13 06:58:15.100: E/WindowManager(1219): at com.example.mysqltest.Register.onClick(Register.java:61)
05-13 06:58:15.100: E/WindowManager(1219): at android.view.View.performClick(View.java:4438)
05-13 06:58:15.100: E/WindowManager(1219): at android.view.View$PerformClick.run(View.java:18422)
05-13 06:58:15.100: E/WindowManager(1219): at android.os.Handler.handleCallback(Handler.java:733)
05-13 06:58:15.100: E/WindowManager(1219): at android.os.Handler.dispatchMessage(Handler.java:95)
05-13 06:58:15.100: E/WindowManager(1219): at android.os.Looper.loop(Looper.java:136)
05-13 06:58:15.100: E/WindowManager(1219): at android.app.ActivityThread.main(ActivityThread.java:5017)
05-13 06:58:15.100: E/WindowManager(1219): at java.lang.reflect.Method.invokeNative(Native Method)
05-13 06:58:15.100: E/WindowManager(1219): at java.lang.reflect.Method.invoke(Method.java:515)
05-13 06:58:15.100: E/WindowManager(1219): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
05-13 06:58:15.100: E/WindowManager(1219): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
05-13 06:58:15.100: E/WindowManager(1219): at dalvik.system.NativeStart.main(Native Method)
EDIT After all the answers received. I made == to equals() and changed the url address to 10.0.2.2/webservices and had already added the internet permission but still no success. Still it exits and shows connection denied. Please help me with this. Now my logcat file is:
05-14 07:09:16.291 895-1191/com.example.mysqltest.app W/System.err﹕ org.apache.http.conn.HttpHostConnectException: Connection to http://10.0.2.2 refused
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at com.example.mysqltest.app.JSONParser.makeHttpRequest(JSONParser.java:90)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at com.example.mysqltest.app.Register$CreateUser.doInBackground(Register.java:94)
05-14 07:09:16.511 895-1191/com.example.mysqltest.app W/System.err﹕ at com.example.mysqltest.app.Register$CreateUser.doInBackground(Register.java:64)
05-14 07:09:16.511 895-1191/com.example.mysqltest.app W/System.err﹕ at android.os.AsyncTask$2.call(AsyncTask.java:288)
05-14 07:09:16.561 895-1191/com.example.mysqltest.app W/System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:237)
05-14 07:09:16.561 895-1191/com.example.mysqltest.app W/System.err﹕ at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
05-14 07:09:16.571 895-1191/com.example.mysqltest.app W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
05-14 07:09:16.571 895-1191/com.example.mysqltest.app W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
05-14 07:09:16.571 895-1191/com.example.mysqltest.app W/System.err﹕ at java.lang.Thread.run(Thread.java:841)
05-14 07:09:16.571 895-1191/com.example.mysqltest.app W/System.err﹕ Caused by: java.net.ConnectException: socket failed: EACCES (Permission denied)
05-14 07:09:17.191 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:181)
05-14 07:09:17.281 895-1191/com.example.mysqltest.app W/System.err﹕ ... 15 more
05-14 07:09:17.441 895-1191/com.example.mysqltest.app W/System.err﹕ Caused by: java.net.SocketException: socket failed: EACCES (Permission denied)
05-14 07:09:17.671 895-1191/com.example.mysqltest.app W/System.err﹕ at libcore.io.IoBridge.socket(IoBridge.java:576)
05-14 07:09:18.601 895-1191/com.example.mysqltest.app W/System.err﹕ Caused by: libcore.io.ErrnoException: socket failed: EACCES (Permission denied)
05-14 07:09:19.031 895-1191/com.example.mysqltest.app W/System.err﹕ at libcore.io.Posix.socket(Native Method)
05-14 07:09:19.031 895-1191/com.example.mysqltest.app W/System.err﹕ at libcore.io.BlockGuardOs.socket(BlockGuardOs.java:181)
05-14 07:09:19.131 895-1191/com.example.mysqltest.app W/System.err﹕ at libcore.io.IoBridge.socket(IoBridge.java:561)
05-14 07:09:19.131 895-1191/com.example.mysqltest.app W/System.err﹕ ... 20 more
05-14 07:09:19.141 895-1191/com.example.mysqltest.app E/Buffer Error﹕ Error converting result java.lang.NullPointerException: lock == null
05-14 07:09:19.141 895-1191/com.example.mysqltest.app E/JSON Parser﹕ Error parsing data org.json.JSONException: End of input at character 0 of
05-14 07:09:19.221 895-1191/com.example.mysqltest.app W/dalvikvm﹕ threadid=12: thread exiting with uncaught exception (group=0xb4afeba8)
05-14 07:09:19.271 895-1191/com.example.mysqltest.app E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #2
Process: com.example.mysqltest.app, PID: 895
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.NullPointerException
at com.example.mysqltest.app.Register$CreateUser.doInBackground(Register.java:97)
at com.example.mysqltest.app.Register$CreateUser.doInBackground(Register.java:64)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
05-14 07:09:26.021 895-895/com.example.mysqltest.app E/WindowManager﹕ android.view.WindowLeaked: Activity com.example.mysqltest.app.Register has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{b4e28230 V.E..... R.....ID 0,0-563,96} that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:348)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
at android.app.Dialog.show(Dialog.java:286)
at com.example.mysqltest.app.Register$CreateUser.onPreExecute(Register.java:77)
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
at android.os.AsyncTask.execute(AsyncTask.java:535)
at com.example.mysqltest.app.Register.onClick(Register.java:61)
at android.view.View.performClick(View.java:4438)
回答1:
As Apoorv says, you need to have permission to access any network.
<uses-permission android:name="android.permission.INTERNET" />
If adding the above to your manifest doesn't fix it (or you already have that permission), the likely problem is your addresses...
private static final String LOGIN_URL = "http://localhost/webservice/login.php";
private static final String LOGIN_URL = "http://localhost/webservice/register.php";
I'm assuming your php server is running on the same computer as the emulator (but not on the emulator itself). If that's the case using localhost wont work. On an emulator localhost is the actual emulated device's loopback address and NOT the loopback address of the computer.
When using networking on an emulator you need to use 10.0.2.2 to connect to the computer's localhost / loopback address. Example...
private static final String LOGIN_URL = "http://10.0.2.2/webservice/login.php";
private static final String LOGIN_URL = "http://10.0.2.2/webservice/register.php";
See Using The Emulator documentation in the Emulator Networking section.
EDIT: One very likely reason for the Window Leaked error is you are trying to access objects that are in the main body of the Activities from the doInBackground methods of your AsyncTasks. You cannot do this as doInBackground runs on a separate thread.
In your AsyncTasks declare your username and password strings in the main body where you declare your failure boolean. Also your static final strings. Example...
class CreateUser extends AsyncTask<String, String, String> {
private static final String LOGIN_URL = "http://localhost/webservice/register.php";
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
boolean failure = false;
String username, password;
...
}
Get the text strings from the EditTexts in the onPreExecute() method of the AsyncTasks (this method runs on the main/UI thread). Example...
@Override
protected void onPreExecute() {
super.onPreExecute();
username = user.getText().toString();
password = pass.getText().toString();
pDialog = new ProgressDialog(Login.this);
...
}
Move your JSONParser declaration and initialisation into the doInBackgoround method of the AsyncTasks. Example...
@Override
protected String doInBackground(String... args) {
// Check for success tag
int success;
JSONParser jsonParser = new JSONParser();
...
}
回答2:
There are few things which you may have missed
1. Add internet permission in your application
2. When you are calling asynctask class add where the request is of POST or GET type
3. As can be seen clearly from your logcat the url you are accessing is not valid even i tried it in my browser, it is not valid
来源：https://stackoverflow.com/questions/23646793/unfortunately-the-application-stopped-working