Android 将JSON输出解析为ListView

Android 将JSON输出解析为ListView,android,json,android-listview,Android,Json,Android Listview,我从android设备连接到服务器,查询数据库并在屏幕上显示结果。但是,我希望在ListView中显示结果。如何让代码显示在ListView中?目前,它只是解析数据并将其显示在屏幕上。如何为ContactName的每个值指定一个参考值?下面是我的代码: public class DbConnectActivity extends Activity { /** Called when the activity is first created. */ TextView txt; @O

我从android设备连接到服务器,查询数据库并在屏幕上显示结果。但是,我希望在ListView中显示结果。如何让代码显示在ListView中?目前,它只是解析数据并将其显示在屏幕上。如何为ContactName的每个值指定一个参考值?下面是我的代码:

   public class DbConnectActivity extends Activity {
/** Called when the activity is first created. */

   TextView txt;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    // Create a crude view - this should really be set via the layout resources 
    // but since its an example saves declaring them in the XML. 
    LinearLayout rootLayout = new LinearLayout(getApplicationContext()); 
    txt = new TextView(getApplicationContext()); 
    rootLayout.addView(txt); 
    setContentView(rootLayout); 

    // Set the text and call the connect function. 
    txt.setText("Connecting...");
  //call the method  to run the data retreival
    txt.setText(getServerData(KEY_121));



}
public static final String KEY_121 = "http://10.0.2.2/dbconnect.php"; //i use my real ip here



private String getServerData(String returnString) {

   InputStream is = null;
   String result = "";


    //the year data to send
   // ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
    //nameValuePairs.add(new BasicNameValuePair("EngID","1"));

    //http post
    try{
            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost(KEY_121);
            //httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            HttpResponse response = httpclient.execute(httppost);
            HttpEntity entity = response.getEntity();
            is = entity.getContent();

    }catch(Exception e){
            Log.e("log_tag", "Error in http connection "+e.toString());
    }

    //convert response to string
    try{

            BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
            StringBuffer sb = new StringBuffer();
            String line = "";
            while ((line = reader.readLine()) != null) {
                    sb.append(line + "\n");
            }
            is.close();
            result=sb.toString();
            //return result;


    }catch(Exception e){
            Log.e("log_tag", "Error converting result "+e.toString());
    }
    //parse json data
    try{
            JSONArray jArray = new JSONArray(result);
            for(int i=0;i<jArray.length();i++){
                    JSONObject json_data = jArray.getJSONObject(i);
                    Log.i("log_tag","Name: "+json_data.getString("ContactName")
                           );
                    //Get an output to the screen
                    returnString += "\n\t" + jArray.getJSONObject(i);

            }
    }catch(JSONException e){
            Log.e("log_tag", "Error parsing data "+e.toString());
    }

    return returnString;
}   

}
公共类DbConnectActivity扩展活动{
/**在首次创建活动时调用*/
文本视图;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//创建一个粗略的视图-这应该通过布局资源进行设置
//但是,因为这是一个示例,所以不需要在XML中声明它们。
LinearLayout rootLayout=新的LinearLayout(getApplicationContext());
txt=新文本视图(getApplicationContext());
rootLayout.addView(txt);
setContentView(rootLayout);
//设置文本并调用connect函数。
txt.setText(“连接…”);
//调用该方法以运行数据检索
setText(getServerData(KEY_121));
}
公共静态最终字符串键_121=”http://10.0.2.2/dbconnect.php“;//我在这里使用我的真实ip
私有字符串getServerData(字符串返回字符串){
InputStream=null;
字符串结果=”;
//要发送的年度数据
//ArrayList nameValuePairs=新的ArrayList();
//添加(新的BasicNameValuePair(“EngID”,“1”));
//http post
试一试{
HttpClient HttpClient=新的DefaultHttpClient();
HttpPost HttpPost=新的HttpPost(键号121);
//setEntity(新的UrlEncodedFormEntity(nameValuePairs));
HttpResponse response=httpclient.execute(httppost);
HttpEntity=response.getEntity();
is=entity.getContent();
}捕获(例外e){
e(“Log_标记”,“http连接错误”+e.toString());
}
//将响应转换为字符串
试一试{
BufferedReader reader=新的BufferedReader(新的InputStreamReader(is,“iso-8859-1”),8;
StringBuffer sb=新的StringBuffer();
字符串行=”;
而((line=reader.readLine())!=null){
sb.追加(第+行“\n”);
}
is.close();
结果=sb.toString();
//返回结果;
}捕获(例外e){
Log.e(“Log_标记”,“错误转换结果”+e.toString());
}
//解析json数据
试一试{
JSONArray jArray=新JSONArray(结果);

对于(int i=0;i我要做的最简单的事情是将JSONArray放在某个ArrayList中,并在arrayadapter中使用它,我要做的最简单的事情是将JSONArray放在某个ArrayList中,并在arrayadapter中使用它,您可以将所有json对象添加到一个列表中,然后从那里加载列表,但正如您已经准备好了一个返回sing的方法一样le字符串。您可以使用以下命令:

使用


您可以将所有json对象添加到一个列表中,然后从此处加载列表,但正如您已经准备好一个返回单个字符串的方法一样。您可以使用以下方法:

使用

公共类JsonExampleActivity扩展了ListActivity{
/**在首次创建活动时调用*/
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
setListAdapter(新的ArrayAdapter(this,android.R.layout.simple_list_item_1,this.fetchTwitterPublicTimeline());
}
公共ArrayList fetchTwitterPublicTimeline()
{
ArrayList listItems=新的ArrayList();
试一试{
URL twitter=新URL(“此处为您的URL”);
URLConnection tc=twitter.openConnection();
BufferedReader in=新的BufferedReader(新的InputStreamReader(
tc.getInputStream());
弦线;
而((line=in.readLine())!=null){
JSONObject ja=新的JSONObject(行);
/*
//对于(int i=0;i
公共类JsonExampleActivity扩展了ListActivity{
/**在首次创建活动时调用*/
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
setListAdapter(新的ArrayAdapter(this,android.R.layout.simple_list_item_1,this.fetchTwitterPublicTimeline());
}
公共ArrayList fetchTwitterPublicTimeline()
{
ArrayList listItems=新的ArrayList();
试一试{
URL twitter=新URL(“此处为您的URL”);
URLConnection tc=twitter.openConnection();
BufferedReader in=新的BufferedReader(新的InputStreamReader(
tc.getInputStream());
弦线;
而((line=in.readLine())!=null){
JSONObject ja=新的JSONObject(行);
/*
//对于(int i=0;iString[] tokens=returnString.split("\n\r");
ArrayAdapter adapter=new ArrayAdapter(this, android.R.layout.simple_list_item_1, tokens);
listView.setAdapter(adapter);
public class JsonExampleActivity extends ListActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.main);
        setListAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1, this.fetchTwitterPublicTimeline()));
    }

    public ArrayList<String> fetchTwitterPublicTimeline()
    {
        ArrayList<String> listItems = new ArrayList<String>();

        try {
            URL twitter = new URL("your url here");

            URLConnection tc = twitter.openConnection();
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    tc.getInputStream()));

            String line;
            while ((line = in.readLine()) != null) {
                  JSONObject ja = new JSONObject(line);
              /*
                //for (int i = 0; i < ja.length(); i++) {
                    JSONObject jo = ja.getJSONObject("_api_error");
                    listItems.add(jo.getString("name"));*/

                    JSONArray jobj=ja.getJSONArray("artists");
                    //JSONArray ja = new JSONArray(line);
                for (int i = 0; i < jobj.length(); i++) {
                    JSONObject jo = jobj.getJSONObject(i);
                    listItems.add(jo.getString("artist_name"));
                }
               // }
            }
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return listItems;
    }
}