我得到了一个项目:请阅读它
示例 JSON --
[ { "slot":"A", "name":"Dummy Subject 1", "code":"SCD1", "class number":"12345", "total students": "67"}, { "slot":"B", "name":"Dummy Subject 2", "code":"SCD2", "class number":"12346", "total students": "29"}, { "slot":"C", "name":"Dummy Subject 3", "code":"SCD3", "class number":"12347", "total students": "41"}, { "slot":"D", "name":"Dummy Subject 4", "code":"SCD4", "class number":"12348", "total students": "65"}, { "slot":"E", "name":"Dummy Subject 5", "code":"SCD5", "class number":"12349", "total students": "55"} ]
示例 JSON 数据，其中包含 5 个虚拟主题的信息以及与每个主题相关的信息。下载此 JSON 数据，根据您的意愿从中解析信息并存储在共享首选项中。 以名称和代码作为标题显示在 ExpandableListView 中。在展开时，显示它的其他细节。
我没能为 N 做到这一点。对象...如果有 n 没有。 JSON数据中的对象....请帮助解决这个问题...
所以我按照说明做了这个项目，但现在我得到了同一个项目，并且在 fragment 中进行，因为#list 项目应该是名称和代码，数据应该是它的数据......
这是我通过使用 Activity 的代码...请告诉我如何使用 fragment 来做同样的事情..
#json_parse_class.java
package com.office.tracker;
// Nikhil Verma 13BCE0037 9787029484 L-217
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
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 android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
public class json_dpa extends Activity {
HttpClient client;
JSONObject dummy1;
SharedPreferences json_spref;;
String[] datas = null;
TextView tv;
public static String s1="Default^Default^Default^Default^Default^Default^Default^Default^" +
"Default^Default^Default^Default^Default^Default^Default^Default^" +
"Default^Default^Default^Default^Default^Default^Default^Default^Default";
private static final String SLOT = "slot";
static final String NAME = "name";
static final String CODE = "code";
static final String ClASS_NUMBER = "cno.";
static final String TOTAL_STUDENTS = "ts";
static final String TOTAL = "t";
SharedPreferences.Editor editor;
public static int ob_counter = 0;
public String deta[] = null;
private static final String PREFS_NAME = "json_prefname";
int count = 0;
final static String URL = "http://www.gdgvitvellore.com/samplejson/";
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.json);
client = new DefaultHttpClient();
tv = (TextView) findViewById(R.id.json_id);
json_spref = getSharedPreferences(PREFS_NAME, 0);
// this.ob_counter = counter;
String[] index = { "slot", "name", "code", "class number",
"total students" };
new getdata().execute(index);
}
public int async(int counter)
{
this.ob_counter = counter;
return 0;
}
public JSONObject gdg(int r) throws ClientProtocolException, IOException,
JSONException {
ob_counter=r;
HttpGet get = new HttpGet(URL);
HttpResponse rtr = client.execute(get);
int status = rtr.getStatusLine().getStatusCode();
if (status == 200) {
HttpEntity e = rtr.getEntity();
String data = EntityUtils.toString(e);
JSONArray detail = new JSONArray(data);
JSONObject dummy = detail.getJSONObject(ob_counter);
return dummy;
} else {
Toast.makeText(json_dpa.this, "Error ", Toast.LENGTH_LONG);
return null;
}
}
public class getdata extends AsyncTask<String, Integer, String> {
protected String doInBackground(String... params) {
try {
dummy1 = gdg(0);
String mystr1 = dummy1.getString(params[0]);
String mystr2 = dummy1.getString(params[1]);
String mystr3 = dummy1.getString(params[2]);
String mystr4 = dummy1.getString(params[3]);
String mystr5 = dummy1.getString(params[4]);
dummy1=null;
dummy1 = gdg(1);
String mystr6 = dummy1.getString(params[0]);
String mystr7 = dummy1.getString(params[1]);
String mystr8 = dummy1.getString(params[2]);
String mystr9 = dummy1.getString(params[3]);
String mystr10 = dummy1.getString(params[4]);
dummy1=null;
dummy1 = gdg(2);
String mystr11 = dummy1.getString(params[0]);
String mystr12 = dummy1.getString(params[1]);
String mystr13 = dummy1.getString(params[2]);
String mystr14 = dummy1.getString(params[3]);
String mystr15 = dummy1.getString(params[4]);
dummy1=null;
dummy1 = gdg(3);
String mystr16 = dummy1.getString(params[0]);
String mystr17 = dummy1.getString(params[1]);
String mystr18 = dummy1.getString(params[2]);
String mystr19 = dummy1.getString(params[3]);
String mystr20 = dummy1.getString(params[4]);
dummy1=null;
dummy1 = gdg(4);
String mystr21 = dummy1.getString(params[0]);
String mystr22 = dummy1.getString(params[1]);
String mystr23 = dummy1.getString(params[2]);
String mystr24 = dummy1.getString(params[3]);
String mystr25 = dummy1.getString(params[4]);
editor = json_spref.edit();
editor.putString(SLOT, mystr1);
editor.putString(NAME, mystr2);
editor.putString(CODE, mystr3);
editor.putString(ClASS_NUMBER, mystr4);
editor.putString(TOTAL_STUDENTS, mystr5);
editor.putString(TOTAL, mystr1+"^"+mystr2+"^"+mystr3+"^"+mystr4+"^"+mystr5+"^"+mystr6+"^"+mystr7
+"^"+mystr8+"^"+mystr9+"^"+mystr10+"^"+mystr11+"^"+mystr12+"^"+mystr13+"^"+mystr14+"^"+mystr15
+"^"+mystr16+"^"+mystr17+"^"+mystr18+"^"+mystr19+"^"+mystr20+"^"+mystr21+"^"+mystr22
+"^"+mystr23+"^"+mystr24+"^"+mystr25);
editor.commit();
return mystr1;
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String result) {
s1 = json_spref.getString(TOTAL, "defaut Slot");
tv.setText(s1);
}
}
}
list_main class.java
package com.office.tracker;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ExpandableListView;
public class json_list_main extends Activity implements OnClickListener
{ // Nikhil Verma 13BCE0037 9787029484 L-217
ExpandableListView elv;
Button but;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.json_exp_list);
elv=(ExpandableListView) findViewById(R.id.json_exp_listID);
but=(Button) findViewById(R.id.list_button);
but.setOnClickListener(this);
//json_dpa ob=new json_dpa();
//ob.async(0);
//String s1=ob.json_spref.getString(ob.NAME, "defaut Slot");
elv.setAdapter(new json_exp_list_view(this));
}
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
super.onCreateOptionsMenu(menu);
MenuInflater mf = getMenuInflater();
mf.inflate(R.menu.cool_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch (item.getItemId()) {
case R.id.aboutus:
Intent rob = new Intent("com.office.tracker.ABOUTUS");
startActivity(rob);
break;
// case R.id.preferences:
//Intent roby = new Intent("com.office.tracker.PREFS");
//startActivity(roby);
//break;
case R.id.exit:
finish();
break;
}
return false;
}
public void onClick(View v) {
if(v.getId()==R.id.list_button){
Intent rob = new Intent("com.office.tracker.JSON_DPA");
startActivity(rob);
}
}
}
custom adapter class.java
package com.office.tracker;
import android.content.Context;
import android.graphics.Color;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;
public class json_exp_list_view extends BaseExpandableListAdapter {
private Context context;
int i=0;
json_dpa ob=new json_dpa();
String ret=ob.s1;
String i1="Slot -";
String i2="Name -";
String i3="Code -";
String i4="Class No. -";
String i5="Total Students -";
String[] splitArray = ret.split("\\^");//split whenever at least one whitespace is encountered
//String s1=ob.json_spref.getString(ob.NAME, "defaut Slot");
//json_dpa ob=new json_dpa();
//String name1=ob.name_ret();
//String code1=ob.code_ret();
String[] parent={i2+splitArray[1]+" , "+i3+splitArray[2],i2+splitArray[6]+" , "+i3+splitArray[7],i2+splitArray[11]+" , "+i3+splitArray[12]
,i2+splitArray[16]+" , "+i3+splitArray[17],i2+splitArray[21]+" , "+i3+splitArray[22]};
String[][] child={{i1+splitArray[0],i4+splitArray[3],splitArray[4]},
{i1+splitArray[5],i4+splitArray[8],i5+splitArray[9]}
,{i1+splitArray[10],i4+splitArray[13],i5+splitArray[14]},
{i1+splitArray[15],i4+splitArray[18],i5+splitArray[19]},
{i1+splitArray[20],i4+splitArray[23],i5+splitArray[24]}};
public json_exp_list_view(Context context) {
this.context=context;
}
@Override
public Object getChild(int arg0, int arg1) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getChildId(int arg0, int arg1) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getChildView(int GroupPosition, int ChildPosition, boolean arg2, View arg3,
ViewGroup arg4) {
TextView tv=new TextView(context);
tv.setText(child[GroupPosition][ChildPosition]);
tv.setPadding(90, 15, 15, 15);
tv.setTextSize(25);
tv.setTextColor(Color.BLUE);
return tv;
}
@Override
public int getChildrenCount(int GroupPosition) {
// TODO Auto-generated method stub
return child[GroupPosition].length;
}
@Override
public Object getGroup(int GroupPosition) {
// TODO Auto-generated method stub
return GroupPosition;
}
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return parent.length;
}
@Override
public long getGroupId(int GroupPosition) {
// TODO Auto-generated method stub
return GroupPosition;
}
@Override
public View getGroupView(int GroupPosition, boolean arg1, View arg2, ViewGroup arg3) {
TextView tv=new TextView(context);
tv.setText(parent[GroupPosition]);
tv.setPadding(110, 15, 15, 15);
tv.setTextSize(27);
tv.setTextColor(Color.GREEN);
return tv;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean isChildSelectable(int arg0, int arg1) {
// TODO Auto-generated method stub
return true;
}
}
最佳答案
要将您的 JSON 字符串转换为对象，您需要执行以下操作:
转到以下链接并下载 GSON: https://code.google.com/p/google-gson/downloads/detail?name=google-gson-1.5-release.zip&can=4&q=
复制到你的项目中
创建表示主题列表的类
在需要将 JSON 转换为主题列表的地方，请在代码中执行以下操作:
//import the packeges
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.tekpub.models.Production;
//type of objct we need to convert JSON string to
Type typeOfDest = new TypeToken<List<Subjects>>(){}.getType();
Gson gson = new Gson();
//return the object
return gson.fromJson(input, typeOfDest);
关于android - 通过fragment显示JSON数据？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25810618/