使用Restful Web服务将数据从Android应用程序发送到PHP时遇到问题。我得到＆＃34; java.lang.RuntimeException：执行doInBackground（）＆＃34;时发生错误错误。请告诉我该怎么做。感谢。
这是MainActivity.java类
package com.example.contactexchange;
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.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.Toast;
public class MainActivity extends Activity {
EditText lastnameBox, firstnameBox, phonenoBox, addressBox;
Spinner salutationBox;
ImageView imageview;
Button addPhone, saveBox;
String lastname, firstname, phoneno, address, salutation;
JSONParser jsonParser = new JSONParser();
GetIPAddress getIPaddress = new GetIPAddress();
ProgressDialog pDialog;
private static String save_contact;
private static final String TAG_SUCCESS = "success";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
save_contact = getIPaddress.getIP()+"register.php";
lastnameBox = (EditText)findViewById(R.id.lastnameBox);
firstnameBox = (EditText)findViewById(R.id.firstnameBox);
phonenoBox = (EditText)findViewById(R.id.phonenoBox);
addressBox = (EditText)findViewById(R.id.addressBox);
salutationBox = (Spinner)findViewById(R.id.spinner1);
imageview = (ImageView)findViewById(R.id.imageView1);
addPhone = (Button)findViewById(R.id.button1);
saveBox = (Button)findViewById(R.id.saveBox);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(getApplicationContext(),
R.array.salutation, R.layout.custom_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(R.layout.custom_spinner_dropdown_item);
// Apply the adapter to the spinner
salutationBox.setAdapter(adapter);
salutationBox.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
salutation = parent.getItemAtPosition(position).toString();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}});
saveBox.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
/*lastname = lastnameBox.getText().toString();
firstname = firstnameBox.getText().toString();
phoneno = phonenoBox.getText().toString();
address = addressBox.getText().toString();
Toast.makeText(getApplicationContext(), salutation+" "+lastname+" "+firstname+" "+phoneno+" "+address, Toast.LENGTH_SHORT).show();
*/
new SaveContact().execute();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
class SaveContact extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
boolean failure = false;
@Override
protected void onPreExecute() {
super.onPreExecute();
// pDialog = new ProgressDialog(MainActivity.this);
// pDialog.setMessage("Saving Contact...");
// 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;
lastname = lastnameBox.getText().toString();
firstname = firstnameBox.getText().toString();
phoneno = phonenoBox.getText().toString();
address = addressBox.getText().toString();
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>(5);
params.add(new BasicNameValuePair("salutation", salutation));
params.add(new BasicNameValuePair("firstname", firstname));
params.add(new BasicNameValuePair("lastname", lastname));
params.add(new BasicNameValuePair("phoneno", phoneno));
params.add(new BasicNameValuePair("address", address));
// getting JSON Object
// Note that create product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(save_contact, "POST", params);
Log.d("Datae" ,salutation+ " " + firstname+" "+lastname+" "+phoneno+" "+address);
// check log cat fro response
Log.d("Create Response", json.toString());
// check for success tag
try {
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully created product
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
//Toast.makeText(getApplicationContext(), "Sussess", Toast.LENGTH_SHORT).show();
// closing this screen
finish();
} else {
Toast.makeText(getApplicationContext(), "Failc", Toast.LENGTH_SHORT).show();
// 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();
}
}
}
这是register.php
<?php
// array for JSON response
$response = array();
// check for required fields
if (isset($_POST['salutation']) && isset($_POST['firstname']) && isset($_POST['lastname']) && isset($_POST['phoneno']) && isset($_POST['address'])) {
$salutation = $_POST['salutation'];
$firstname = $_POST['firstname'];
$lastname = $_POST['lastname'];
$phoneno = $_POST['phoneno'];
$address = $_POST['address'];
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// mysql inserting a new row
$result = mysql_query("INSERT INTO contact_info(salutation, first_name, last_name, phone_no, address) VALUES('$salutation', '$firstname', '$lastname', '$phoneno', '$address')");
// check if row inserted or not
if ($result) {
// successfully inserted into database
$response["success"] = 1;
$response["message"] = "Product successfully created.";
// echoing JSON response
echo json_encode($response);
} else {
// failed to insert row
$response["success"] = 0;
$response["message"] = "Oops! An error occurred.";
// echoing JSON response
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
这是logcat错误
07-27 15:16:44.125: E/AndroidRuntime(455): FATAL EXCEPTION: AsyncTask #1
07-27 15:16:44.125: E/AndroidRuntime(455): java.lang.RuntimeException: An error occured while executing doInBackground()
07-27 15:16:44.125: E/AndroidRuntime(455): at android.os.AsyncTask$3.done(AsyncTask.java:266)
07-27 15:16:44.125: E/AndroidRuntime(455): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
07-27 15:16:44.125: E/AndroidRuntime(455): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
07-27 15:16:44.125: E/AndroidRuntime(455): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
07-27 15:16:44.125: E/AndroidRuntime(455): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
07-27 15:16:44.125: E/AndroidRuntime(455): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1081)
07-27 15:16:44.125: E/AndroidRuntime(455): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:574)
07-27 15:16:44.125: E/AndroidRuntime(455): at java.lang.Thread.run(Thread.java:1020)
07-27 15:16:44.125: E/AndroidRuntime(455): Caused by: java.lang.NullPointerException
07-27 15:16:44.125: E/AndroidRuntime(455): at com.example.contactexchange.MainActivity$SaveContact.doInBackground(MainActivity.java:147)
07-27 15:16:44.125: E/AndroidRuntime(455): at com.example.contactexchange.MainActivity$SaveContact.doInBackground(MainActivity.java:1)
07-27 15:16:44.125: E/AndroidRuntime(455): at android.os.AsyncTask$2.call(AsyncTask.java:252)
07-27 15:16:44.125: E/AndroidRuntime(455): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
07-27 15:16:44.125: E/AndroidRuntime(455): ... 4 more
07-27 15:16:44.295: W/IInputConnectionWrapper(455): showStatusIcon on inactive InputConnection
07-27 15:16:46.645: E/InputQueue-JNI(455): channel '40fefa40 PopupWindow:408fcb78 (client)' ~ Publisher closed input channel or an error occurred. events=0x8
请告诉我该怎么做。感谢
答案 0 :(得分：0)
我很确定您的问题是您在doInBackground上阅读的EditTexts：
EditText lastnameBox, firstnameBox, phonenoBox, addressBox;
我建议你在按钮点击监听器上获取这些editText字段的值，将这些值保存为字符串并将这些值作为参数发送到doInBackground。
你的doInBackground已经准备好接受一个String数组，所以你只需要将它们作为args值。