所以我已将笔记本电脑连接到我的机器人wifi并使用了网关IP地址，但是我试图从数据库中拔出来。数据库工作正如我单独测试的那样 Logcat建议登录时出错。 （生病标记错误出现，所以你不必）
07-31 01:49:41.323: W/System.err(20516): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
07-31 01:49:41.343: E/JSON Parser(20516): Error parsing data org.json.JSONException: End of input at character 0 of
07-31 01:49:41.353: D/request!(20516): starting
07-31 01:49:41.353: W/dalvikvm(20516): threadid=11: thread exiting with uncaught exception (group=0x4194ada0)
07-31 01:49:41.353: E/AndroidRuntime(20516): FATAL EXCEPTION: AsyncTask #1
07-31 01:49:41.353: E/AndroidRuntime(20516): Process: com.example.mysqltest, PID: 20516
07-31 01:49:41.353: E/AndroidRuntime(20516): java.lang.RuntimeException: An error occured while executing doInBackground()
07-31 01:49:41.353: E/AndroidRuntime(20516): at android.os.AsyncTask$3.done(AsyncTask.java:300)
07-31 01:49:41.353: E/AndroidRuntime(20516): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
07-31 01:49:41.353: E/AndroidRuntime(20516): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
07-31 01:49:41.353: E/AndroidRuntime(20516): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
07-31 01:49:41.353: E/AndroidRuntime(20516): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
07-31 01:49:41.353: E/AndroidRuntime(20516): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
07-31 01:49:41.353: E/AndroidRuntime(20516): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
07-31 01:49:41.353: E/AndroidRuntime(20516): at java.lang.Thread.run(Thread.java:841)
07-31 01:49:41.353: E/AndroidRuntime(20516): Caused by: java.lang.NullPointerException //this will be marked
07-31 01:49:41.353: E/AndroidRuntime(20516): at com.example.mysqltest.Login$AttemptLogin.doInBackground(Login.java:125)
07-31 01:49:41.353: E/AndroidRuntime(20516): at com.example.mysqltest.Login$AttemptLogin.doInBackground(Login.java:1)
07-31 01:49:41.353: E/AndroidRuntime(20516): at android.os.AsyncTask$2.call(AsyncTask.java:288)
07-31 01:49:41.353: E/AndroidRuntime(20516): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
07-31 01:49:41.353: E/AndroidRuntime(20516): ... 4 more
07-31 01:49:42.054: W/IInputConnectionWrapper(20516): showStatusIcon on inactive InputConnection
07-31 01:49:42.474: E/WindowManager(20516): android.view.WindowLeaked: Activity com.example.mysqltest.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{42da7448 V.E..... R......D 0,0-1026,288} that was originally added here
07-31 01:49:42.474: E/WindowManager(20516): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:457)
07-31 01:49:42.474: E/WindowManager(20516): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:267)
07-31 01:49:42.474: E/WindowManager(20516): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
07-31 01:49:42.474: E/WindowManager(20516): at android.app.Dialog.show(Dialog.java:288)
07-31 01:49:42.474: E/WindowManager(20516): at com.example.mysqltest.Login$AttemptLogin.onPreExecute(Login.java:103)
07-31 01:49:42.474: E/WindowManager(20516): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
07-31 01:49:42.474: E/WindowManager(20516): at android.os.AsyncTask.execute(AsyncTask.java:535)
package com.example.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://192.168.43.1/drinkdealz/login.php";
// testing from a real server:
// private static final String LOGIN_URL =
// "http://www.mybringback.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> {
@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()); ////THIS IS WHERE ERROR COMES UP////
// 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;
}
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();
}
}
}
}
最后，抱歉今天发布过多，截止日期临近！ 编辑：我再次运行它并得到错误：07-31 02：29：58.732：E / AndroidRuntime（26604）：引起：java.lang.IllegalStateException：目标主机不能为空，或在参数中设置。 scheme = null，host = null，path = 192.168.43.1 / drinkdealz / register.php