当我启动我的应用程序时，没有崩溃但是json中的数据没有显示，并且在日志中有这些消息：
package com.example.nicol.etablissement43;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.HttpConnectionParams;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
/**
* Created by nicol on 25/04/2017.
*/
public class recherche_2 extends AppCompatActivity {
private static final String LOG_TAG = "Selection Ville";
private ListView Ville;
private ArrayAdapter<String> listAdapter ;
private AdapterClient adapterClient ;
private TextView SQLData;
@Override/*
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.recherche_2);
}*/
protected void onCreate(Bundle savedInstanceState) {
{
if (Build.VERSION.SDK_INT > 8) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
super.onCreate(savedInstanceState);
String page = this.getPage("http://appec43.890m.com/connectionbddandroid/config.inc.php");
Log.i("ContenuPost", page);
setContentView(R.layout.recherche_2);
SQLData = (TextView)findViewById(R.id.SQLData);
Ville = (ListView) findViewById(R.id.Ville);
SQLData.setText("Les villes");
SQLData.setText("Les villes");
//String[] planets = new String[] {""};
// ArrayList<String> planetList = new ArrayList<String>();
// planetList.addAll( Arrays.asList(planets) );
//listAdapter = new ArrayAdapter<String>(this, R.layout.simplerow, planetList);
adapterClient = new AdapterClient(this, R.layout.recherche_2);
try {
JSONArray jsonArray = new JSONArray(page);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
client clientobj = new client();
clientobj.setVille(jsonObject.getString("Ville"));
clientobj.setCodepostal(jsonObject.getString("codepostal"));
adapterClient.add(clientobj);
}
} catch (JSONException e) {
e.printStackTrace();
}
/*
String[] split = page.split(",");
for (int i = 0; i < split.length; i++) {
listAdapter.add( split[i] );
if (i != split.length - 1) {
listAdapter.add(" ");
}
}
*/
Ville.setAdapter(adapterClient);
}
}
public String getPage(String adresse){
StringBuffer stringBuffer = new StringBuffer("");
BufferedReader bufferedReader = null;
try {
HttpClient httpClient = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(httpClient.getParams(), 15000);
HttpPost httpPost = new HttpPost();
URI uri = new URI(adresse);
httpPost.setURI(uri);
List<NameValuePair> parametres = new ArrayList<NameValuePair>();
parametres.add(new BasicNameValuePair("login", "u265740438_root2"));
parametres.add(new BasicNameValuePair("pass", "nicolas"));
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parametres);
httpPost.setEntity(formEntity);
HttpResponse httpResponse = httpClient.execute(httpPost);
InputStream inputStream = httpResponse.getEntity().getContent();
bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
String ligneLue = bufferedReader.readLine();
while (ligneLue != null) {
Log.i("Valeur", ligneLue);
stringBuffer.append(ligneLue);
stringBuffer.append("\n");
ligneLue = bufferedReader.readLine();
}
}
catch(Exception e) {
Log.e("Erreur", e.getMessage());
}
finally{
if(bufferedReader != null){
try{
bufferedReader.close();
}
catch (IOException e){
}
}
}
return stringBuffer.toString();
}
}
我的主程序（recherche_2.java）：
package com.example.nicol.etablissement43;
public class client {
private String ville;
private String codepostal;
public void setVille(String ville){ this.ville = ville ;}
public void setCodepostal(String codepostal){this.codepostal = codepostal;}
public String getVille(){return this.ville;}
public String getcodepostal(){return this.codepostal;}
}
我项目的另一部分：
client.java：
package com.example.nicol.etablissement43;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
public class AdapterClient extends ArrayAdapter<client>
{
public AdapterClient(Context context, int textViewRessourceId)
{
super(context, textViewRessourceId);
}
public View getView(int position, View convertView, ViewGroup parent)
{
View result = convertView;
if (convertView == null)
{
result = LayoutInflater.from(getContext()).inflate(R.layout.ligne, parent, false);
}
client Ville = getItem(position);
//Assigner aux textView les valeurs obtenues par les get de la classe client
TextView ville = (TextView)result.findViewById(R.id.idv);
ville.setText(Ville.getVille());
TextView nom = (TextView)result.findViewById(R.id.villes);
nom.setText(Ville.getcodepostal());
return result;
}
}
适配器client.java：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:text="Villes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/SQLData"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="52dp"
android:layout_marginStart="52dp" />
<ListView
android:id="@+id/Ville"
style="@style/Widget.AppCompat.Light.ListView.DropDown"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/textView"
android:layout_marginTop="24dp" />
</RelativeLayout>
我的布局：
recherche_2.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:text="TextView"
android:layout_width="45dp"
android:layout_height="wrap_content"
android:layout_marginTop="25dp"
android:id="@+id/idv"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:text="TextView"
android:layout_width="330dp"
android:layout_height="wrap_content"
android:layout_marginLeft="0dp"
android:layout_alignTop="@+id/villes"
android:layout_toEndOf="@+id/villes"
android:id="@+id/villes"
android:layout_toRightOf="@+id/villes" />
</LinearLayout>
<!--
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rowTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:textSize="16sp" >
</TextView>
-->
ligne.xml：
"[{\"id\":\"1\",\"ville\":\"ARAULES\"},{\"id\":\"2\",\"ville\":\"AUREC SUR LOIRE\"},{\"id\":\"3\",\"ville\":\"AUREC SUR LOIRE\"},{\"id\":\"4\",\"ville\":\"BAINS\"},{\"id\":\"5\",\"ville\":\" BAS EN BASSET\"},{\"id\":\"6\",\"ville\":\"BEAULIEU\"},{\"id\":\"7\",\"ville\":\"BEAUZAC\"},{\"id\":\"8\",\"ville\":\"BRIOUDE\"},{\"id\":\"9\",\"ville\":\" BRIOUDE\"},{\"id\":\"10\",\"ville\":\"BRIOUDE\"},{\"id\":\"11\",\"ville\":\" BRIVES CHARENSAC\"},{\"id\":\"12\",\"ville\":\" BRIVES CHARENSAC\"},{\"id\":\"13\",\"ville\":\" BRIVES CHARENSAC\"},{\"id\":\"14\",\"ville\":\" BRIVES CHARENSAC\"},{\"id\":\"15\",\"ville\":\"BRIVES CHARENSAC\"},{\"id\":\"16\",\"ville\":\"COUBON\"},{\"id\":\"17\",\"ville\":\"CRAPONNE\"},{\"id\":\"18\",\"ville\":\"DUNI\\u00c8RES\"},{\"id\":\"19\",\"ville\":\"CRAPONNE\"},{\"id\":\"20\",\"ville\":\"DUNI\\u00c8RES\"},{\"id\":\"21\",\"ville\":\"ESPALY\"},{\"id\":\"22\",\"ville\":\"GRAZAC\"},{\"id\":\"23\",\"ville\":\"LANGEAC\"},{\"id\":\"24\",\"ville\":\"LANGEAC\"},{\"id\":\"25\",\"ville\":\" LANTRIAC\"},{\"id\":\"26\",\"ville\":\"LAPTE\"},{\"id\":\"27\",\"ville\":\"LAUSSONNE\"},{\"id\":\"28\",\"ville\":\" LAVOUTE CHILHAC\"},{\"id\":\"29\",\"ville\":\"LE MONASTIER\"},{\"id\":\"30\",\"ville\":\"LE MONASTIER\"},{\"id\":\"31\",\"ville\":\"MONISTROL\\\/LOIRE\"},{\"id\":\"32\",\"ville\":\"MONISTROL\\\/LOIRE\"},{\"id\":\"33\",\"ville\":\"MONISTROL\\\/LOIRE\"},{\"id\":\"34\",\"ville\":\"MONTFAUCON\"},{\"id\":\"35\",\"ville\":\" MONTREGARD\"},{\"id\":\"36\",\"ville\":\"POLIGNAC\"},{\"id\":\"37\",\"ville\":\"PRADELLES\"},{\"id\":\"38\",\"ville\":\"LE PUY EN VELAY\"},{\"id\":\"39\",\"ville\":\"LE PUY EN VELAY\"},{\"id\":\"40\",\"ville\":\"LE PUY EN VELAY\"},{\"id\":\"41\",\"ville\":\"LE PUY EN VELAY\"},{\"id\":\"42\",\"ville\":\"LE PUY EN VELAY\"},{\"id\":\"43\",\"ville\":\"LE PUY EN VELAY\"},{\"id\":\"44\",\"ville\":\"VALS PRES LE PUY\"},{\"id\":\"45\",\"ville\":\"LE PUY EN VELAY\"},{\"id\":\"46\",\"ville\":\"LE PUY EN VELAY\"},{\"id\":\"47\",\"ville\":\"LE PUY EN VELAY\"},{\"id\":\"48\",\"ville\":\"LE PUY EN VELAY\"},{\"id\":\"49\",\"ville\":\"RAUCOULES\"},{\"id\":\"50\",\"ville\":\"LE PUY EN VELAY\"},{\"id\":\"51\",\"ville\":\"RETOURNAC\"},{\"id\":\"52\",\"ville\":\"RIOTORD\"},{\"id\":\"53\",\"ville\":\"ROSIERES\"},{\"id\":\"54\",\"ville\":\"ST BONNET LE FROID\"},{\"id\":\"55\",\"ville\":\"ST DIDIER EN VELAY\"},{\"id\":\"56\",\"ville\":\"ST DIDIER EN VELAY\"},{\"id\":\"57\",\"ville\":\"ST FERREOL D\\u2019AUROURE\"},{\"id\":\"58\",\"ville\":\"SAINT FRONT\"},{\"id\":\"59\",\"ville\":\"ST GERMAIN LAPRADE\"},{\"id\":\"60\",\"ville\":\"STE FLORINE\"},{\"id\":\"61\",\"ville\":\"STE FLORINE\"},{\"id\":\"62\",\"ville\":\"ST JULIEN CHAPTEUIL\"},{\"id\":\"63\",\"ville\":\"ST JULIEN CHAPTEUIL\"},{\"id\":\"64\",\"ville\":\"ST JUST MALMONT\"},{\"id\":\"65\",\"ville\":\"ST MAURICE DE LIGNON\"},{\"id\":\"66\",\"ville\":\"ST PAL\\\/CHALENCON\"},{\"id\":\"67\",\"ville\":\"ST PAL DE MONS\"},{\"id\":\"68\",\"ville\":\"SAINT PAULIEN\"},{\"id\":\"69\",\"ville\":\"ST PIERRE D\\\/CHAMP\"},{\"id\":\"70\",\"ville\":\"ST ROMAIN LACHALM\"},{\"id\":\"71\",\"ville\":\"STE SIGOL\\u00c8NE\"},{\"id\":\"72\",\"ville\":\"STE SIGOL\\u00c8NE\"},{\"id\":\"73\",\"ville\":\"ST VICTOR MALESCOURS\"},{\"id\":\"74\",\"ville\":\"SAUGUES\"},{\"id\":\"75\",\"ville\":\"SAUGUES\"},{\"id\":\"76\",\"ville\":\"LA SEAUVE S\\\/SEM\\u00c8NE\"},{\"id\":\"77\",\"ville\":\"SOLIGNAC\\\/LOIRE\"},{\"id\":\"78\",\"ville\":\"TENCE\"},{\"id\":\"79\",\"ville\":\"TENCE\"},{\"id\":\"80\",\"ville\":\"TIRANGES\"},{\"id\":\"81\",\"ville\":\"VERGEZAC\"},{\"id\":\"82\",\"ville\":\"LES VILLETTES\"},{\"id\":\"83\",\"ville\":\"VOREY\"},{\"id\":\"84\",\"ville\":\"YSSINGEAUX\"},{\"id\":\"85\",\"ville\":\"YSSINGEAUX \"},{\"id\":\"86\",\"ville\":\"YSSINGEAUX \"},{\"id\":\"87\",\"ville\":\"YSSINGEAUX\"}]"
和Json：
match(x,y) #If no match is found, it returns (by default) NA
#[1] NA 1 2 3
is.na(match(x,y)) #Thus, is.na will create a logical vector for NA values
#[1] TRUE FALSE FALSE FALSE
x[is.na(match(x,y))] #Using the above logical vector as index for x
#[1] 1
这个问题有解决方法吗？因为我有很多需要寻找的东西，我还没有找到 提前谢谢你
答案 0 :(得分：0)
您正在将字符串转换为jsonArray，其中您的响应是jsonObject：
JSONObject jsnobject = new JSONObject(result);
JSONArray jsonArray = jsnobject.getJSONArray("data");
for (int i = 0; i < jsonArray.length(); i++)
{
JSONObject data= jsonArray.getJSONObject(i);
dataList.add(data.getString("name"));
}
答案 1 :(得分：0)
首先，您要在主线程上发送您不应该的请求。 其次，考虑使用HttpURLConnection
，不推荐使用HttpClient下面的代码应该可以使用AsyncTask
private class DownloadTask extends AsyncTask<String, Void, String> {
public DownloadTask() {
}
@Override
protected String doInBackground(String... urls) {
StringBuffer stringBuffer = new StringBuffer("");
BufferedReader bufferedReader = null;
HttpURLConnection conn = null;
DataOutputStream dos = null;
int serverResponseCode = 0;
try {
URL url = new URL("" + urls[0]);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true); // Allow Inputs
conn.setUseCaches(false); // Don't use a Cached Copy
conn.setRequestMethod("GET");
serverResponseCode = conn.getResponseCode();
String serverResponseMessage = conn.getResponseMessage();
if(serverResponseCode == 200) {
StringBuffer sb = new StringBuffer();
InputStream is = new BufferedInputStream(conn.getInputStream());
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String inputLine = "";
while ((inputLine = br.readLine()) != null) {
sb.append(inputLine);
}
return sb.toString();
} else {
return "";
}
}
catch(Exception e) {
e.printStackTrace();
Log.e("Erreur", e.getMessage());
}
finally{
if(bufferedReader != null){
try{
bufferedReader.close();
}
catch (IOException e){
}
}
}
return stringBuffer.toString();
}
// onPostExecute displays the results of the AsyncTask.
@Override
protected void onPostExecute(String result) {
boolean error = false;
// This can be done in the main activity UI Thread
try {
JSONArray arr = new JSONArray(result);
// Output just to validate that it work
for (int i = 0; i < arr.length(); i++) {
JSONObject jsonObject = arr.getJSONObject(i);
System.out.println(jsonObject.toString());
}
showData(arr) // This can be a function in your activity
} catch (JSONException e) {
e.printStackTrace();
}
}
}
在onCreate方法中，您可以像这样调用它
new DownloadTask().execute("http://appec43.890m.com/connectionbddandroid/config.inc.php");
我希望这会有所帮助。
答案 2 :(得分：-1)
这是一个已知的android bug，你不应该在4.1之前覆盖那个方法。有关详细信息，请查看此answer。