我有一个连接到 PHP 服务器的 android 应用程序项目，我在 codeigniter 中编写了它。
我的 JSONparser 是：
package com.example.com.tourism;
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.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
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() {
}
// function get json from url
// by making HTTP POST or GET method
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;
}
}
我连接到服务器的活动java代码是
package com.example.com.tourism;
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.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class SignUp extends Activity {
EditText first,last,birth ,pass;
private ProgressDialog pDialog;
private static String url_create_user = "http://10.0.2.2/tourism/index.php/site/register";
JSONParser jsonParser = new JSONParser();
private static final String TAG_SUCCESS = "success";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sign_up);
Button signUp=(Button)findViewById(R.id.sign_up);
first =(EditText) findViewById(R.id.edfname);
last =(EditText) findViewById(R.id.edlname);
pass =(EditText) findViewById(R.id.edpass);
signUp.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new Createnewuser().execute();
}
});
}
class Createnewuser extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(SignUp.this);
pDialog.setMessage("Creating User..");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Creating product
* */
protected String doInBackground(String... args) {
String name = first.getText().toString();
String price = last.getText().toString();
String description = pass.getText().toString();
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("first_name", name));
params.add(new BasicNameValuePair("last_name", price));
params.add(new BasicNameValuePair("password", description));
// getting JSON Object
// Note that create product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(url_create_user,
"POST", params);
// check log cat fro response
Log.d("Create Response", json.toString());
// check for success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully created product
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
// closing this screen
finish();
} else {
// failed to create product
}
} 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 done
pDialog.dismiss();
}
}
log cat 中的错误是
07-07 11:30:44.159: E/JSON Parser(20514): Error parsing data org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject
07-07 11:30:44.189: W/dalvikvm(20514): threadid=11: thread exiting with uncaught exception (group=0x40a71930)
07-07 11:30:44.229: E/AndroidRuntime(20514): FATAL EXCEPTION: AsyncTask #1
07-07 11:30:44.229: E/AndroidRuntime(20514): java.lang.RuntimeException: An error occured while executing doInBackground()
07-07 11:30:44.229: E/AndroidRuntime(20514): at android.os.AsyncTask$3.done(AsyncTask.java:299)
07-07 11:30:44.229: E/AndroidRuntime(20514): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
07-07 11:30:44.229: E/AndroidRuntime(20514): at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
07-07 11:30:44.229: E/AndroidRuntime(20514): at java.util.concurrent.FutureTask.run(FutureTask.java:239)
07-07 11:30:44.229: E/AndroidRuntime(20514): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
07-07 11:30:44.229: E/AndroidRuntime(20514): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
07-07 11:30:44.229: E/AndroidRuntime(20514): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
07-07 11:30:44.229: E/AndroidRuntime(20514): at java.lang.Thread.run(Thread.java:856)
07-07 11:30:44.229: E/AndroidRuntime(20514): Caused by: java.lang.NullPointerException
07-07 11:30:44.229: E/AndroidRuntime(20514): at com.example.com.tourism.SignUp$Createnewuser.doInBackground(SignUp.java:98)
07-07 11:30:44.229: E/AndroidRuntime(20514): at com.example.com.tourism.SignUp$Createnewuser.doInBackground(SignUp.java:1)
07-07 11:30:44.229: E/AndroidRuntime(20514): at android.os.AsyncTask$2.call(AsyncTask.java:287)
07-07 11:30:44.229: E/AndroidRuntime(20514): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
07-07 11:30:44.229: E/AndroidRuntime(20514): ... 4 more
07-07 11:30:44.429: I/Choreographer(20514): Skipped 49 frames! The application may be doing too much work on its main thread.
07-07 11:30:44.779: I/Choreographer(20514): Skipped 222 frames! The application may be doing too much work on its main thread.
07-07 11:30:45.069: I/Choreographer(20514): Skipped 149 frames! The application may be doing too much work on its main thread.
07-07 11:30:45.369: I/Choreographer(20514): Skipped 194 frames! The application may be doing too much work on its main thread.
07-07 11:30:45.459: I/Choreographer(20514): Skipped 50 frames! The application may be doing too much work on its main thread.
07-07 11:30:46.019: E/WindowManager(20514): Activity com.example.com.tourism.SignUp has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d743a8 V.E..... R.....ID 0,0-304,96} that was originally added here
07-07 11:30:46.019: E/WindowManager(20514): android.view.WindowLeaked: Activity com.example.com.tourism.SignUp has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d743a8 V.E..... R.....ID 0,0-304,96} that was originally added here
07-07 11:30:46.019: E/WindowManager(20514): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354)
07-07 11:30:46.019: E/WindowManager(20514): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
07-07 11:30:46.019: E/WindowManager(20514): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
07-07 11:30:46.019: E/WindowManager(20514): at android.app.Dialog.show(Dialog.java:281)
07-07 11:30:46.019: E/WindowManager(20514): at com.example.com.tourism.SignUp$Createnewuser.onPreExecute(SignUp.java:75)
07-07 11:30:46.019: E/WindowManager(20514): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
07-07 11:30:46.019: E/WindowManager(20514): at android.os.AsyncTask.execute(AsyncTask.java:534)
07-07 11:30:46.019: E/WindowManager(20514): at com.example.com.tourism.SignUp$1.onClick(SignUp.java:57)
07-07 11:30:46.019: E/WindowManager(20514): at android.view.View.performClick(View.java:4204)
07-07 11:30:46.019: E/WindowManager(20514): at android.view.View$PerformClick.run(View.java:17355)
07-07 11:30:46.019: E/WindowManager(20514): at android.os.Handler.handleCallback(Handler.java:725)
07-07 11:30:46.019: E/WindowManager(20514): at android.os.Handler.dispatchMessage(Handler.java:92)
07-07 11:30:46.019: E/WindowManager(20514): at android.os.Looper.loop(Looper.java:137)
07-07 11:30:46.019: E/WindowManager(20514): at android.app.ActivityThread.main(ActivityThread.java:5041)
07-07 11:30:46.019: E/WindowManager(20514): at java.lang.reflect.Method.invokeNative(Native Method)
07-07 11:30:46.019: E/WindowManager(20514): at java.lang.reflect.Method.invoke(Method.java:511)
07-07 11:30:46.019: E/WindowManager(20514): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-07 11:30:46.019: E/WindowManager(20514): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-07 11:30:46.019: E/WindowManager(20514): at dalvik.system.NativeStart.main(Native Method)
我不知道问题出在哪里，请帮助我是我的代码不正确？？？如果有人有正确的代码，请给我我正在使用 codeigniter for php，这是我在上面调用的代码
function register_get()
{
$json = array('status' => false );
if($this->input->post()==null){
$this -> response($json, 200);
}
$firstname = $this->post("first_name");
$lastname = $this->post("last_name");
$password = $this->post("password");
if(!$firstname || !$lastname || !$password){
$json['status'] = "wrong insert";
$this -> response($json, 200);
}
$this->load->model('Data_model');
$result = $this->Data_model->search($firstname, $lastname);
if($result)
{
$this->Data_model->insert($firstname,$lastname,$password);
$json['status'] = true;
}
// here if false..
$this -> response($json, 200);
}