我是android开发的初学者。我一直在寻找一周。逐字逐句地遵循所有教程。每当我启动我的Android模拟器时，它首先显示ProcessSystem没有响应。等或退出？其次，应用程序加载但是在我填写表单后单击“注册”或“登录”按钮后，在显示进程对话框几秒钟后，“不幸的是应用程序已停止工作”显示并退出。 我的Login.java文件是
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();
}
}
}
}
我的Register.java是
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();
}
}
}
}
JSONParser.java文件是
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;
}
}
logcat是：
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$MethodAndArgsCaller.run(ZygoteInit.java:779)
05-13 06:58:15.100: E/WindowManager(1219): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
05-13 06:58:15.100: E/WindowManager(1219): at dalvik.system.NativeStart.main(Native Method)
修改 收到所有答案后。我做了== to equals（）并将url地址更改为10.0.2.2/webservices并且已经添加了Internet权限但仍然没有成功。它仍然退出并显示连接被拒绝。请帮我解决一下这个。现在我的logcat文件是：
05-14 07:09:16.291 895-1191/com.example.mysqltest.app W/System.err﹕ org.apache.http.conn.HttpHostConnectException: Connection to http://10.0.2.2 refused
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at com.example.mysqltest.app.JSONParser.makeHttpRequest(JSONParser.java:90)
05-14 07:09:16.501 895-1191/com.example.mysqltest.app W/System.err﹕ at com.example.mysqltest.app.Register$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)
答案 0 :(得分：1)
正如Apoorv所说，您需要获得访问任何网络的权限。
<uses-permission android:name="android.permission.INTERNET" />
如果将以上内容添加到您的清单中并未修复（或者您已经拥有该权限），则可能出现的问题是您的地址......
private static final String LOGIN_URL = "http://localhost/webservice/login.php";
private static final String LOGIN_URL = "http://localhost/webservice/register.php";
我假设您的php服务器与模拟器在同一台计算机上运行（但不在模拟器本身上运行）。如果使用localhost的情况不适用。在模拟器上localhost是实际模拟设备的环回地址，而不是计算机的环回地址。
在模拟器上使用网络时，您需要使用10.0.2.2连接到计算机的localhost / loopback地址。实施例...
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";
请参阅Using The Emulator部分中的Emulator Networking文档。
编辑：窗口泄露错误的一个非常可能的原因是您尝试从AsyncTasks的doInBackground方法访问活动主体中的对象。你不能这样做，因为doInBackground在一个单独的线程上运行。
在AsyncTasks中，在声明失败布尔值的主体中声明您的用户名和密码字符串。也是你的静态最终字符串。实施例...
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;
...
}
从AsyncTasks的onPreExecute()方法中获取EditTexts中的文本字符串（此方法在主/ UI线程上运行）。实施例...
@Override
protected void onPreExecute() {
super.onPreExecute();
username = user.getText().toString();
password = pass.getText().toString();
pDialog = new ProgressDialog(Login.this);
...
}
将您的JSONParser声明和初始化移动到AsyncTasks的doInBackgoround方法中。实施例...
@Override
protected String doInBackground(String... args) {
// Check for success tag
int success;
JSONParser jsonParser = new JSONParser();
...
}
答案 1 :(得分：0)
你可能错过的事情很少
1.在您的申请中添加互联网权限
2.在调用asynctask类时，在请求为POST或GET类型的地方添加
3.从您的logcat中可以清楚地看到，即使我在浏览器中尝试过，您访问的URL也无效，但它无效