我一直在寻找一种方法将数据发送到远程服务器上的php页面,似乎无法让它工作......我修改了here上类似问题的代码 但它仍然没有工作..我必须把httppost放在asynctask或什么?我该怎么办?代码:
public class gameOver extends Activity {
//TextView hiscores;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gameover);
final Button b = (Button) findViewById(R.id.button1);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Perform action on click
Toast.makeText(gameOver.this, "button was pressed",
Toast.LENGTH_SHORT).show();
try {
JSONObject json = new JSONObject();
json.put("timestamp", 1351181576.64078);
json.put("name", "engine_speed");
json.put("value", 714.0);
postData(json);
JSONObject json2 = new JSONObject();
json2.put("timestamp", 1351181576.7207818);
json2.put("name", "steering_wheel_angle");
json2.put("value", 11.1633);
postData(json2);
} catch (JSONException e) {
e.printStackTrace();
}
}
});
}
public void postData(JSONObject json) throws JSONException {
HttpClient httpclient = new DefaultHttpClient();
String URL = "http://www.mysite.com/s.php";
try {
HttpPost httppost = new HttpPost(URL);
List<NameValuePair> nvp = new ArrayList<NameValuePair>(2);
nvp.add(new BasicNameValuePair("json", json.toString()));
httppost.setEntity(new UrlEncodedFormEntity(nvp));
HttpResponse response = httpclient.execute(httppost);
if(response != null) {
InputStream is = response.getEntity().getContent();
//input stream is response that can be shown back on android
Toast.makeText(gameOver.this, (CharSequence) is,
Toast.LENGTH_SHORT).show();
}else{ Toast.makeText(gameOver.this, "data Not sent",
Toast.LENGTH_SHORT).show();}
}catch (Exception e) {
e.printStackTrace();
}
}
}
logcat的:
09-06 11:45:28.986: W/System.err(30433): android.os.NetworkOnMainThreadException
09-06 11:45:28.986: W/System.err(30433): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133)
09-06 11:45:28.986: W/System.err(30433): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
09-06 11:45:28.986: W/System.err(30433): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
09-06 11:45:28.986: W/System.err(30433): at java.net.InetAddress.getAllByName(InetAddress.java:214)
09-06 11:45:28.986: W/System.err(30433): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
09-06 11:45:28.986: W/System.err(30433): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
09-06 11:45:28.986: W/System.err(30433): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
09-06 11:45:28.986: W/System.err(30433): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
09-06 11:45:28.986: W/System.err(30433): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
09-06 11:45:28.986: W/System.err(30433): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
09-06 11:45:28.986: W/System.err(30433): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
09-06 11:45:28.986: W/System.err(30433): at com.example.testgallery.gameOver.postData(gameOver.java:90)
09-06 11:45:28.986: W/System.err(30433): at com.example.testgallery.gameOver$1.onClick(gameOver.java:65)
09-06 11:45:28.986: W/System.err(30433): at android.view.View.performClick(View.java:4240)
09-06 11:45:28.986: W/System.err(30433): at android.view.View$PerformClick.run(View.java:17721)
09-06 11:45:28.986: W/System.err(30433): at android.os.Handler.handleCallback(Handler.java:730)
09-06 11:45:28.986: W/System.err(30433): at android.os.Handler.dispatchMessage(Handler.java:92)
09-06 11:45:28.986: W/System.err(30433): at android.os.Looper.loop(Looper.java:137)
09-06 11:45:28.986: W/System.err(30433): at android.app.ActivityThread.main(ActivityThread.java:5103)
09-06 11:45:28.986: W/System.err(30433): at java.lang.reflect.Method.invokeNative(Native Method)
09-06 11:45:28.986: W/System.err(30433): at java.lang.reflect.Method.invoke(Method.java:525)
09-06 11:45:28.986: W/System.err(30433): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
09-06 11:45:28.996: W/System.err(30433): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
09-06 11:45:28.996: W/System.err(30433): at dalvik.system.NativeStart.main(Native Method)
09-06 11:45:28.996: W/System.err(30433): android.os.NetworkOnMainThreadException
09-06 11:45:28.996: W/System.err(30433): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133)
09-06 11:45:28.996: W/System.err(30433): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
09-06 11:45:28.996: W/System.err(30433): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
09-06 11:45:28.996: W/System.err(30433): at java.net.InetAddress.getAllByName(InetAddress.java:214)
09-06 11:45:28.996: W/System.err(30433): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
09-06 11:45:28.996: W/System.err(30433): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
09-06 11:45:28.996: W/System.err(30433): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
09-06 11:45:28.996: W/System.err(30433): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
09-06 11:45:28.996: W/System.err(30433): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
09-06 11:45:28.996: W/System.err(30433): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
09-06 11:45:28.996: W/System.err(30433): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
09-06 11:45:28.996: W/System.err(30433): at com.example.testgallery.gameOver.postData(gameOver.java:90)
09-06 11:45:28.996: W/System.err(30433): at com.example.testgallery.gameOver$1.onClick(gameOver.java:71)
09-06 11:45:28.996: W/System.err(30433): at android.view.View.performClick(View.java:4240)
09-06 11:45:28.996: W/System.err(30433): at android.view.View$PerformClick.run(View.java:17721)
09-06 11:45:28.996: W/System.err(30433): at android.os.Handler.handleCallback(Handler.java:730)
09-06 11:45:28.996: W/System.err(30433): at android.os.Handler.dispatchMessage(Handler.java:92)
09-06 11:45:28.996: W/System.err(30433): at android.os.Looper.loop(Looper.java:137)
09-06 11:45:28.996: W/System.err(30433): at android.app.ActivityThread.main(ActivityThread.java:5103)
09-06 11:45:28.996: W/System.err(30433): at java.lang.reflect.Method.invokeNative(Native Method)
09-06 11:45:28.996: W/System.err(30433): at java.lang.reflect.Method.invoke(Method.java:525)
09-06 11:45:28.996: W/System.err(30433): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
09-06 11:45:28.996: W/System.err(30433): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
09-06 11:45:28.996: W/System.err(30433): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分:2)
是的,你绝对应该使用AsyncTask
来做到这一点!
在您的代码中,您可以创建一个扩展AsyncTask
的类:
public class LoadData extends AsyncTask<String, Integer, JSONObject> {
在这个课程中,您将覆盖2个方法:doInBackground
,基本上可以完成onClick()
方法中的代码,onPostExecute()
可以使用响应进行处理服务器。
protected JSONObject doInBackground(String... urls) {
// Build your json objects and create an HttpPost that will contact the url in urls[0]
// then return a JSONObject containing the response
}
protected void onPostExecute(JSONObject result) {
// parse the content of result to analyze the response of the server
}
然后在您的onClick
方法中,您可以创建此类的实例并在其上调用execute
,并传递您要访问的网址:
LoadData loadData = new LoadData(getApplicationContext());
loadData.execute(your_url);
修改强>
我记得前一段时间为另一个人写过类似的代码,你可以查一下这篇文章的另一个例子:getting value using JSON nullpointer
答案 1 :(得分:0)
您应该使用 AsyncTask 来发送数据。我不知道你的php页面,但我会尝试解释如何使用JSON从android向服务器发送数据(如果你有任何进一步的问题请参阅本教程http://www.androidhive.info/2012/05/how-to-connect-android-with-php-mysql/)。您将作为POST请求向服务器发送三个值。我认为你的php文件应该接收三个变量并将它们插入到数据库中,然后相应地发回数据。
您的php文件(我假设您要将这些值插入名为Details的数据库,其中包含三列时间戳,名称,值,然后告诉应用程序用户是否已插入数据。)
<强> insert.php 强>
<?php
//connect to your database
//declare an array to encode your response
$arr = array();
if((isset($_POST["timestamp"]))&&(isset($_POST["name"]))&&(isset($_POST["value"])))
{
$time = $_POST["timestamp"];
$name = $_POST["name"];
$value = $_POST["value"];
$query = "insert into Details(timestamp,name,value) values '$time','$name','$value'";
$result = mysql_query($result);
if ($result) {
// successfully inserted into database
$arr["success"] = 1;
$arr["message"] = "Data successfully inserted.";
// echoing JSON response
echo json_encode($arr);
} else {
// failed to insert row
$arr["success"] = 0;
$arr["message"] = "An error occurred.";
// echoing JSON response
echo json_encode($arr);
}
} else {
// required field is missing
$arr["success"] = 0;
$arr["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($arr);
}
?>
你的类gameOver必须有一个子类,必须扩展 AsyncTask 并进行JSON插入。
gameOver活动
public class gameOver extends Activity {
//TextView hiscores;
JSONParser jsonParser;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gameover);
final Button b = (Button) findViewById(R.id.button1);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Perform action on click
Toast.makeText(gameOver.this, "button was pressed",
Toast.LENGTH_SHORT).show();
new Insert().execute();
}
});
}
class Insert extends AsyncTask<String, String, String>
{
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(gameOver.this);
pDialog.setMessage("Inserting Details..");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected String doInBackground(String... arg0) {
jsonParser = new JSONParser();
//Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("timestamp",1351181576.64078));
params.add(new BasicNameValuePair("name","engine_speed"));
params.add(new BasicNameValuePair("value", 714.0));
//getting JSON Object
JSONObject json = jsonParser.makeHttpRequest("<your-domain-name>/insert.php", "POST", params);
//Log.d("JSON:",json.toString());
try
{
success = json.getInt("success");
if(success == 1){
Log.d("Query","Data Successfully inserted");
}else{
Log.d("Query","Unsuccessful in data submition");
}
}catch(JSONException e){
Log.d("JSON:","EXCEPTION");
}
return null;
}
上面提到的 JSONParser 类是
package <your-package-name>;
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;
}
}