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我正在嘗試在android中開發類似應用程序的測驗。與4選擇一起的問題應該來自服務器。我正在嘗試使用json發送數據。問題或選擇也可能包含數字。我嘗試使用下面的json文件。它在android中運行良好。現在我的問題是我無法使用下面的JSON文件發送圖像。是我的方式來發送數據正確或應該使用JSON一起使用PHP。使用json將多選數據從服務器發送到android？
file.json（JSON文件）
{"multiple":[{
"question": "In which course are you inrolled in?",
"choice1":"BIM",
"choice2":"BBA",
"choice3":"BIT",
"choice4":"BSCCSIT"
},
{
"question": "What comes after n?",
"choice1":"s",
"choice2":"t",
"choice3":"o",
"choice4":"p"
},
{
"question":"Who is 38th Prime Minister of Nepal?",
"choice1":"KP Oli",
"choice2":"Susil Koirala",
"choice3":"Sher Bahadur Deuba",
"choice4":"Prachanda"
}
]
}
MainActivity.java
package com.multiple;
import android.app.*;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.*;
import android.widget.AdapterView.*;
import android.widget.RelativeLayout;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.concurrent.ExecutionException;
public class MainActivity extends Activity
{
private ListView listview;
private Button finishbtn;
private CheckBox check1,check2,check3,check4;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
List<HashMap<String, String>> collect = new ArrayList<HashMap<String, String>>();
final List<HashMap<String, String>> answer = new ArrayList<HashMap<String, String>>();
listview = (ListView) findViewById(R.id.list);
finishbtn= (Button)findViewById(R.id.button);
populate p = new populate();
try {
collect = p.execute().get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
String[] str = new String[]{"first", "second", "third", "fourth", "fifth"};
int[] val = new int[]{R.id.textView1, R.id.checkBox1, R.id.checkBox2, R.id.checkBox3, R.id.checkBox4};
SimpleAdapter adapter = new SimpleAdapter(this, collect, R.layout.list, str, val);
listview.setAdapter(adapter);
finishbtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
int count = listview.getCount();
Log.i("count",String.valueOf(count));
int j=0;
while(j<count)
{
RelativeLayout relLayout = (RelativeLayout) listview.getChildAt(j);
for(int i=0;i< relLayout.getChildCount();i++)
{
HashMap<String,String> value= new HashMap<String,String>();
View vi = relLayout.getChildAt(i);
if(vi instanceof CheckBox)
{
CheckBox c = (CheckBox)vi;
if(c.isChecked())
{
String ch = (String)c.getText();
Log.i("list",ch);
value.put(String.valueOf(j+1),ch);
answer.add(value);
}
}
}
j++;
}
Select select = new Select();
select.execute(answer);
}
});
}
public class populate extends AsyncTask< String, Void,List<HashMap<String,String>> >
{
public List<HashMap<String,String>> doInBackground(String... urls)
{
List<HashMap<String,String>> collect= new ArrayList<HashMap<String, String>>();
try
{
HttpClient client = new DefaultHttpClient();
HttpGet post = new HttpGet("http://192.168.10.116/file.json");
HttpResponse res= client.execute(post);
HttpEntity entity = res.getEntity();
String response = EntityUtils.toString(entity);
JSONObject obj = new JSONObject(response);
JSONArray jsonArray = obj.optJSONArray("multiple");
Log.i("size of the array",String.valueOf(jsonArray.length()));
ArrayList<JSONObject> array = new ArrayList<JSONObject>();
for(int i=0; i < jsonArray.length(); i++)
{
JSONObject jsonObject = jsonArray.getJSONObject(i);
array.add(jsonObject);
}
for(int i=0;i<array.size();i++){
JSONObject jsonObject = array.get(i);
String question = jsonObject.optString("question").toString();
String c1 = jsonObject.optString("choice1").toString();
String c2 = jsonObject.optString("choice2").toString();
String c3 = jsonObject.optString("choice3").toString();
String c4 = jsonObject.optString("choice4").toString();
// Log.i("asdfas",question);
// Log.i("second",c1);
// Log.i("third",c2);
// Log.i("fourth",c3);
// Log.i("fifth",c4);
HashMap<String,String> map = new HashMap<String, String>();
map.put("first",question);
map.put("second",c1);
map.put("third",c2);
map.put("fourth",c3);
map.put("fifth",c4);
collect.add(map);
}
}
catch(IOException ex){}
catch(JSONException ex){}
return collect;
}
}
}
Select.java
package com.multiple;
import android.os.AsyncTask;
import android.util.Log;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.*;
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.util.EntityUtils;
import org.json.JSONArray;
public class Select extends AsyncTask<List<HashMap<String, String>>, Void, Void>
{
@Override
protected Void doInBackground(List<HashMap<String, String>>... answer) {
try {
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost("http://192.168.10.116/check.php");
JSONArray array = new JSONArray(answer[0]);
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("forward",array.toString()));
post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = client.execute(post);
HttpEntity httpEntity = response.getEntity();
String result = null;
result = EntityUtils.toString(httpEntity);
Log.i("response", result);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}