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如何获取Android ListView中所选列表项的值

listview android

supriya chauhan · 技术社区 · 6 年前

我正在尝试在Android中获取所选列表项的值。

因为我一直在使用下面的JSON解析代码,当选择列表项时,我试图得到它的值,但是得到的结果如下:{Name=SupRyY},所需的结果是“SuPRYA”,如何实现这一点,请帮助。

>代码>公共类弹出式扩展AppCuastActudio { private string tag=mainActivity.class.getSimpleName(); 私有进程对话框pDialog; 公共列表视图lv; 字符串名称; 字符串路径; 字符串类型; 字符串视频; 字符串音频; 字符串项; 字符串交互性; //私有静态字符串url=“http://10.60.100.101/mydata/chapter.php”; 私有静态字符串url; arraylist<hashmap<string,string>>联系人列表; 创建时受保护的void(bundle savedinstanceState){ 超级OnCube(SaveDestChanStand); setContentView(r.layout.popup); CONTACTLISTAB=新的ARARYLIST & LT;& GT;(); //按钮bt=(button)findViewByID(r.id.next); lv=(listview)findview byid(r.id.list); //从mygrid.java页面接收内容意向=getIntent(); item=intent.getStringExtra(“name”); Soop.Out.PrtLn(“点击先前活动”项+项); getSupportActionBar().settitle(项); new getcontacts().execute(); } 私有类getContacts扩展异步任务<void、void、void>。{ @重写受保护的void onPrexecute()。{ 超级。 //显示进度对话框 pDialog=新建进程对话框(popup.this); PistIOL.SET消息(“请等待…”); pDialog.setCancelable(真); Pultudio.Suffor(); } @重写保护空虚的背景(空虚…ARG0){ httphandler sh=new httphandler(); //…绕过SSL安全的代码。 trustManager[]trustAllcerts=new trustManager[]new x509trustManager()。{ 公共Java.Security .Cur.X509Cudio[] GETAcExecdDeSuffSe(){ 返回空; } public void checkclienttrusted(x509certificate[]certs,string authtype){ } public void checkServerTrusted(x509certificate[]certs,string authtype){ } } }; 尝试{ //安装全信任信任信任管理器 sslcontext sc=sslcontext.getInstance(“ssl”); SC.IIT(NULL、TrimeCalvices、新Java.Security、SecureRANDO()); httpsurlConnection.setDefaultSSLSocketFactory(sc.getSocketFactory()); } catch(异常e){ system.out.println(“supriya di error”+e); } //创建所有信任的主机名验证程序 hostnameverifier allhostsvalid=new hostnameverifier()。{ 公共布尔验证(String主机名,SSLsession会话){ 回归真实; } }; //安装所有信任主机验证程序 httpsurlConnection.setDefaultHostnameVerifier(所有主机有效); //…..绕过证书的代码在此结束 //string url=“http://www.ebiebook.com/rest/drmrestservices.svc/rest/products”; //url=“http://10.60.100.101/mydata/chapter.php”; //请求URL并得到响应 url=“https://stage.indiancalearning.com/mydata/”; 字符串jsonstr=sh.makeservicecall(url); log.e(tag,“来自url的响应:”+jsonstr); 如果(JSONSTR)!{NULL){ 尝试{ jsonObject jsonObj=新的jsonObject(jsonStr); //获取json数组节点 jsonarray contacts=jsonobj.getjsonarray(“supi”); //循环访问所有联系人对于(int i=0;I& lt;Clase.LangTh();I++){ jsonObject c=contacts.getjsonObject(i); name=c.getString(“主题”); 路径=c.getstring(“url”); dType=C.GETSHIPE(“类型”); //字符串email=c.getstring(“email”); system.out.println(“名称值:”+name); system.out.println(“url值:”+path); system.out.println(“数据类型值:”+dtype); //单个联系人的tmp哈希映射 hashmap<string,string>contact=new hashmap<>(); //将每个子节点添加到hashmap key=>value system.out.println(“联系人姓名值:”+name); //system.out.println(“联系人URL值:”+url); system.out.println(“联系人数据类型值:”+dtype); contact.put(“姓名”,name); //contact.put(“url”,url); //contact.put(“dtype”,dtype); //将联系人添加到联系人列表联系人列表。添加(联系人); } } catch(异常E) system.out.println(“错误”+e); }否则{ log.e(标记“无法从服务器获取JSON”); runOnIthread(new runnable()){ @重写 public void run()。{ toast.makeText(getApplicationContext(), “无法从服务器获取JSON。检查logcat有无可能的错误!“, 烤面包,长度显示(); } (}); } 返回空; } @重写 Protected void OnPostExecute(void结果){ super.onPostExecute(结果); //关闭进度对话框 if(pDialog.IsShowing()) pDialog.Dismise(); final list adapter adapter=新simpleadapter(popup.this,contactlist,r.layout.list_item, 新字符串[]“name”,新int[]r.id.name); 低压设置适配器(适配器); lv.setOnitEmclickListener(new adapterview.OnitEmclickListener()。{ @重写 public void OnItemClick(adapterView<?>父级,视图视图, int位置,long id){ string text=parent.getitematposition(position.toString(); //字符串文本=(textView)view).getText().toString(); //toast.makeText(getApplicationContext(),arr[position],toast.length_long).show(); system.out.println(“弹出页面文本:”+text); system.out.println(“弹出页面路径:”+path); 意向意向=新意向(popup.this,audioplayer.class); intent.putExtra(“路径”,path); 意向。PutExtra(“名称”,文本); 开始活动(意图); } (}); } } } < /代码> IMGSRC=“HTTPS://I.STACK.IMGURUR.COM/YOQQR.PNG”ALT=“输入图像描述在这里”/> /pcTIN列表项目,我试图得到它的价值,但得到的结果如下:{Name=SupRyY},所需的结果是'SupRy',如何才能做到这一点,请帮助。

public class Popup extends AppCompatActivity {

private String TAG = MainActivity.class.getSimpleName();

private ProgressDialog pDialog;
public ListView lv;
String name;
String path;
String dtype;
String video;
String audio;
String item;
String interactivity;

//private static String url = "http://10.60.100.101/mydata/chapter.php";
private static String url;
ArrayList<HashMap<String, String>> contactList;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.popup);
    contactList = new ArrayList<>();
    //Button bt= (Button)findViewById(R.id.next);
    lv = (ListView) findViewById(R.id.list);

    //Receiving content from the Mygrid.java page
    Intent intent = getIntent();
    item = intent.getStringExtra("name");
    System.out.println("Item clicked at the previous activity"+ item);
    getSupportActionBar().setTitle(item);

    new GetContacts().execute();

}


private class GetContacts extends AsyncTask<Void, Void, Void> {

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        // Showing progress dialog
        pDialog = new ProgressDialog(Popup.this);
        pDialog.setMessage("Please wait...");
        pDialog.setCancelable(true);
        pDialog.show();
    }
    @Override
    protected Void doInBackground(Void... arg0) {
        HttpHandler sh = new HttpHandler();
        //...code for bypassing the ssl security..

        TrustManager[] trustAllCerts = new TrustManager[] {new X509TrustManager() {
            public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                return null;
            }
            public void checkClientTrusted(X509Certificate[] certs, String authType) {
            }
            public void checkServerTrusted(X509Certificate[] certs, String authType) {
            }
        }
        };
       try {
       // Install the all-trusting trust manager
         SSLContext sc = SSLContext.getInstance("SSL");
         sc.init(null, trustAllCerts, new java.security.SecureRandom());
         HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
        }

          catch(Exception e){
                 System.out.println("supriya di error"+ e);
           }
             // Create all-trusting host name verifier
                  HostnameVerifier allHostsValid = new HostnameVerifier() {
            public boolean verify(String hostname, SSLSession session) {
                return true;
                   }
        };

             // Install the all-trusting host verifier
            HttpsURLConnection.setDefaultHostnameVerifier(allHostsValid);

        //.....code of bypassing certificate ends here


        // String url= "http://www.ebiebook.com/rest/DRMRestServices.svc/rest/products";
       // url = "http://10.60.100.101/mydata/chapter.php";

        // Making a request to url and getting response
        url = "https://stage.indiannicalearning.com/mydata/";

        String jsonStr = sh.makeServiceCall(url);

        Log.e(TAG, "Response from url: " + jsonStr);


        if (jsonStr != null) {
            try {
                JSONObject jsonObj = new JSONObject(jsonStr);
                // Getting JSON Array node

                JSONArray contacts = jsonObj.getJSONArray("supi");

                // looping through All Contacts
                for (int i = 0; i < contacts.length(); i++) {
                    JSONObject c = contacts.getJSONObject(i);

                    name = c.getString("topics");
                    path = c.getString("url");
                    dtype = c.getString("type");
                    //String email = c.getString("email");
                    System.out.println("name value :"+name);
                    System.out.println("url value :"+path);
                    System.out.println("data type value :"+dtype);
                    // tmp hash map for single contact

                     HashMap<String, String> contact = new HashMap<>();
                    // adding each child node to HashMap key => value
                    System.out.println("contact name value :"+name);
                    //System.out.println("contact url value :"+url);
                    System.out.println("contact data type value :"+dtype);
                    contact.put("name", name);
                    //contact.put("url", url);
                   // contact.put("dtype", dtype);
                    // adding contact to contact list
                    contactList.add(contact);
                }
                }


                catch(Exception e)
                { System.out.println("error"+ e);}
                } else {
                Log.e(TAG, "Couldn't get json from server.");
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(),
                                "Couldn't get json from server. Check LogCat for possible errors!",
                                Toast.LENGTH_LONG)
                                .show();
                    }
                });
            }
            return null;
    }

   @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        // Dismiss the progress dialog
        if (pDialog.isShowing())
            pDialog.dismiss();

           final ListAdapter adapter = new SimpleAdapter(Popup.this, contactList, R.layout.list_item,
                   new String []{"name"}, new int[]{R.id.name});

                   lv.setAdapter(adapter);
                   lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
           @Override
           public void onItemClick(AdapterView<?> parent, View view,
                                   int position, long id) {

               String text =parent.getItemAtPosition(position).toString();

                     //  String text = ((TextView) view).getText().toString();
                    // Toast.makeText(getApplicationContext(),arr[position],Toast.LENGTH_LONG).show();
                   System.out.println("pop up  page text:" +text);
                   System.out.println("pop up  page path:" +path);

                   Intent intent = new Intent(Popup.this, AudioPlayer.class);
                   intent.putExtra("path", path);
                   intent.putExtra("name", text);
                   startActivity(intent);
            }
       });
    }
}
}

1 回复 | 直到 6 年前

AskNilesh 6 年前

试试这个

lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
  @Override
  public void onItemClick(AdapterView<?> parent, View view,
                                       int position, long id) {

      HashMap<String, String> contact=(HashMap<String, String>)parent.getItemAtPosition(position).toString()
      String text =contact.get("name");


      System.out.println("pop up  page text:" +text);
      System.out.println("pop up  page path:" +path);

      Intent intent = new Intent(Popup.this, AudioPlayer.class);
      intent.putExtra("path", path);
      intent.putExtra("name", text);
      startActivity(intent);
   }
});