我有一个Activity，它有2个文本字段和一个按钮;单击按钮时，文本字段中的文本将上传到sql remote server.it工作正常。
现在我想创建一个滑动/标签视图。我已经这样做了，直到这个没问题。现在，我希望在其中一个选项卡中的此滑动视图下显示上述活动。 GUI很好。但是当我点击按钮上传时，它会显示错误。
以下是代码，当它是一个单独的活动时起作用： AddComment.java
package overskov.rhkbrand;
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.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;
import android.widget.Toast;
public class AddComment extends Activity implements OnClickListener{
private EditText title, message;
private Button mSubmit;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
//php login script
//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 POST_COMMENT_URL = "http://xxx.xxx.x.x:1234/webservice/addcomment.php";
//testing on Emulator:
private static final String POST_COMMENT_URL = "http://overskov-hansen.dk/addcomment.php";
//testing from a real server:
//private static final String POST_COMMENT_URL = "http://www.mybringback.com/webservice/addcomment.php";
//ids
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.add_comment);
title = (EditText)findViewById(R.id.title);
message = (EditText)findViewById(R.id.message);
mSubmit = (Button)findViewById(R.id.submit);
mSubmit.setOnClickListener(this);
}
@Override
public void onClick(View v) {
new PostComment().execute();
}
class PostComment extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(AddComment.this);
pDialog.setMessage("Posting Comment...");
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 post_title = title.getText().toString();
String post_message = message.getText().toString();
//We need to change this:
String post_username = "temp";
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", post_username));
params.add(new BasicNameValuePair("title", post_title));
params.add(new BasicNameValuePair("message", post_message));
Log.d("request!", "starting");
//Posting user data to script
JSONObject json = jsonParser.makeHttpRequest(
POST_COMMENT_URL, "POST", params);
// full json response
Log.d("Post Comment attempt", json.toString());
// json success element
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Log.d("Comment Added!", json.toString());
finish();
return json.getString(TAG_MESSAGE);
}else{
Log.d("Comment 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(AddComment.this, file_url, Toast.LENGTH_LONG).show();
}
}
}
}
它使用JSONParse.java：
package overskov.rhkbrand;
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() {
}
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;
}
}
现在当我制作标签/滑动视图，并尝试在其中一个标签片段中包含此AddComment.java时，当我单击按钮上传到远程服务器时，它会显示以下错误：
02-13 21:41:11.529: D/ActivityThread(15232): setTargetHeapUtilization:0.25
02-13 21:41:11.529: D/ActivityThread(15232): setTargetHeapIdealFree:8388608
02-13 21:41:11.529: D/ActivityThread(15232): setTargetHeapConcurrentStart:2097152
02-13 21:41:12.089: I/Adreno200-EGL(15232): <qeglDrvAPI_eglInitialize:290>: EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_ICS_STRAWBERRY_RB5.04.00.04.29.000_msm7627a_ICS_STRAWBERRY_RB5.1_CL2615821_release_AU (CL2615821)
02-13 21:41:12.089: I/Adreno200-EGL(15232): Build Date: 07/30/12 Mon
02-13 21:41:12.089: I/Adreno200-EGL(15232): Local Branch: mybranch139377
02-13 21:41:12.089: I/Adreno200-EGL(15232): Remote Branch: quic/ics_strawberry_rb5.1
02-13 21:41:12.089: I/Adreno200-EGL(15232): Local Patches: NONE
02-13 21:41:12.089: I/Adreno200-EGL(15232): Reconstruct Branch: AU_LINUX_ANDROID_ICS_STRAWBERRY_RB5.04.00.04.29.000 + NOTHING
02-13 21:44:01.629: D/request!(15232): starting
02-13 21:44:01.809: W/System.err(15232): java.net.UnknownHostException: Unable to resolve host "members.000webhost.com": No address associated with hostname
02-13 21:44:01.839: W/System.err(15232): at java.net.InetAddress.lookupHostByName(InetAddress.java:426)
02-13 21:44:01.839: W/System.err(15232): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
02-13 21:44:01.849: W/System.err(15232): at java.net.InetAddress.getAllByName(InetAddress.java:220)
02-13 21:44:01.849: W/System.err(15232): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
02-13 21:44:01.849: W/System.err(15232): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
02-13 21:44:01.849: W/System.err(15232): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
02-13 21:44:01.849: W/System.err(15232): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
02-13 21:44:01.849: W/System.err(15232): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
02-13 21:44:01.849: W/System.err(15232): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
02-13 21:44:01.859: W/System.err(15232): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
02-13 21:44:01.859: W/System.err(15232): at info.androidhive.tabsswipe.JSONParser.makeHttpRequest(JSONParser.java:110)
02-13 21:44:01.859: W/System.err(15232): at info.androidhive.tabsswipe.GamesFragment$PostComment.doInBackground(GamesFragment.java:146)
02-13 21:44:01.859: W/System.err(15232): at info.androidhive.tabsswipe.GamesFragment$PostComment.doInBackground(GamesFragment.java:1)
02-13 21:44:01.859: W/System.err(15232): at android.os.AsyncTask$2.call(AsyncTask.java:264)
02-13 21:44:01.859: W/System.err(15232): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
02-13 21:44:01.859: W/System.err(15232): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
02-13 21:44:01.859: W/System.err(15232): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
02-13 21:44:01.869: W/System.err(15232): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
02-13 21:44:01.869: W/System.err(15232): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
02-13 21:44:01.869: W/System.err(15232): at java.lang.Thread.run(Thread.java:856)
02-13 21:44:01.869: W/System.err(15232): Caused by: libcore.io.GaiException: getaddrinfo failed: EAI_NODATA (No address associated with hostname)
02-13 21:44:01.869: W/System.err(15232): at libcore.io.Posix.getaddrinfo(Native Method)
02-13 21:44:01.879: W/System.err(15232): at libcore.io.ForwardingOs.getaddrinfo(ForwardingOs.java:55)
02-13 21:44:01.879: W/System.err(15232): at java.net.InetAddress.lookupHostByName(InetAddress.java:411)
02-13 21:44:01.879: W/System.err(15232): ... 19 more
02-13 21:44:01.879: E/Buffer Error(15232): Error converting result java.lang.NullPointerException
02-13 21:44:01.889: E/JSON Parser(15232): Error parsing data org.json.JSONException: End of input at character 0 of
02-13 21:44:01.889: W/dalvikvm(15232): threadid=11: thread exiting with uncaught exception (group=0x40a8c390)
02-13 21:44:01.899: E/AndroidRuntime(15232): FATAL EXCEPTION: AsyncTask #1
02-13 21:44:01.899: E/AndroidRuntime(15232): java.lang.RuntimeException: An error occured while executing doInBackground()
02-13 21:44:01.899: E/AndroidRuntime(15232): at android.os.AsyncTask$3.done(AsyncTask.java:278)
02-13 21:44:01.899: E/AndroidRuntime(15232): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
02-13 21:44:01.899: E/AndroidRuntime(15232): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
02-13 21:44:01.899: E/AndroidRuntime(15232): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
02-13 21:44:01.899: E/AndroidRuntime(15232): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
02-13 21:44:01.899: E/AndroidRuntime(15232): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
02-13 21:44:01.899: E/AndroidRuntime(15232): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
02-13 21:44:01.899: E/AndroidRuntime(15232): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
02-13 21:44:01.899: E/AndroidRuntime(15232): at java.lang.Thread.run(Thread.java:856)
02-13 21:44:01.899: E/AndroidRuntime(15232): Caused by: java.lang.NullPointerException
02-13 21:44:01.899: E/AndroidRuntime(15232): at info.androidhive.tabsswipe.GamesFragment$PostComment.doInBackground(GamesFragment.java:150)
02-13 21:44:01.899: E/AndroidRuntime(15232): at info.androidhive.tabsswipe.GamesFragment$PostComment.doInBackground(GamesFragment.java:1)
02-13 21:44:01.899: E/AndroidRuntime(15232): at android.os.AsyncTask$2.call(AsyncTask.java:264)
02-13 21:44:01.899: E/AndroidRuntime(15232): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
02-13 21:44:01.899: E/AndroidRuntime(15232): ... 5 more
有人可以帮忙吗？
答案 0 :(得分：0)
02-13 21：44：01.809：W / System.err（15232）：java.net.UnknownHostException：无法解析主机“members.000webhost.com”：没有与主机名关联的地址
你基本上是在做主机解析，无论你使用什么连接（WiFi，3G ......）都无法解析该主机。这似乎是一个连接问题，因为每个DNS主机名都有一个IP地址（这个逻辑并不总是适用于另一方）。
由于您提供的代码没有members.000webhost.com的任何引用，您似乎只需将该行包含在try语句中catch UnknownHostException异常。
try {
the_line_or_lines_that_try_to_connect_to_this_host("members.000webhost.com");
}
catch (UnknownHostException e) {
// Maybe some logging and try again?
}