android-通过json在textview中显示数据

概述我想通过php从mysql数据库中显示用户详细信息,并在androidtextview中显示它.场景是这样的：当用户登录到他的帐户时,他将被重定向到仪表板,该仪表板包含4个按钮,即：新闻源,个人资料,日历和关于.当用户单击配置文件按钮时,用户详细信息(例如他的姓,名,中间名等)将显示在文本视图中.当

我想通过PHP从mysql数据库中显示用户详细信息,并在android textvIEw中显示它.场景是这样的：当用户登录到他的帐户时,他将被重定向到仪表板,该仪表板包含4个按钮,即：新闻源,个人资料,日历和关于.当用户单击配置文件按钮时,用户详细信息(例如他的姓,名,中间名等)将显示在文本视图中.当我运行我的应用程序时,它什么都不显示,但是在我的PHP脚本中它返回用户详细信息.这里似乎是什么问题？

这是我的Java代码：

package sscr.stag;import java.util.ArrayList;import java.util.List;import org.apache.http.nameValuePair;import org.apache.http.message.BasicnameValuePair;import org.Json.JsONArray;import org.Json.JsONException;import org.Json.JsONObject;import androID.app.Activity;import androID.app.ProgressDialog;import androID.content.SharedPreferences;import androID.os.AsyncTask;import androID.os.Bundle;import androID.preference.PreferenceManager;import androID.util.Log;import androID.Widget.TextVIEw;public class AdProfile extends Activity {// All xml labelsTextVIEw txtFname;TextVIEw txtMname;TextVIEw txtLname;// Progress Dialogprivate ProgressDialog pDialog;// Creating JsON Parser objectJsONParser JsonParser = new JsONParser();// Profile Json objectJsONArray user;JsONObject hay;// Profile JsON urlprivate static final String PROfile_URL     ="http://www.stagconnect.com/StagConnect/admin/TestProfile.PHP";// ALL JsON node namesprivate static final String TAG_PROfile = "user";// private static final String TAG_ID = "ID";private static final String TAG_USERname = "username";private static final String TAG_FirsTname = "first_name";private static final String TAG_MIDDLEname = "mIDdle_initial";private static final String TAG_LASTname = "last_name";@OverrIDepublic voID onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentVIEw(R.layout.adminprofile);txtFname = (TextVIEw) findVIEwByID(R.ID.fname);txtMname = (TextVIEw) findVIEwByID(R.ID.mname);txtLname = (TextVIEw) findVIEwByID(R.ID.lname);// Loading Profile in Background Threadnew LoadProfile().execute();}class LoadProfile extends AsyncTask<String, String, String> {public voID test(){ hay = new JsONObject();        // Storing each Json item in variable        try {            String firstname = hay.getString(TAG_FirsTname);            String mIDdlename = hay.getString(TAG_MIDDLEname);            String lastname = hay.getString(TAG_LASTname);            // displaying all data in textvIEw           txtFname.setText("Firstname: " + firstname);            txtMname.setText("MIDdle name: " + mIDdlename);            txtLname.setText("Last name " + lastname);        } catch (JsONException e) {            // Todo auto-generated catch block            e.printstacktrace();        } }@OverrIDeprotected voID onPreExecute() {super.onPreExecute();pDialog = new ProgressDialog(AdProfile.this);pDialog.setMessage("Loading profile ...");pDialog.setIndeterminate(false);pDialog.setCancelable(false);pDialog.show();}   /**    * getting Profile JsON    * */   protected String doInBackground(String... args) {    // Building ParametersSharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(AdProfile.this);String post_username = sp.getString("username", "anon");List<nameValuePair> params = new ArrayList<nameValuePair>();params.add(new BasicnameValuePair("username", post_username));// getting JsON string from URLJsONObject Json = JsonParser.makehttpRequest(PROfile_URL, "POST",        params);// Check your log cat for JsON reponseLog.d("Profile JsON: ", Json.toString());try {    // profile Json object    user = Json.getJsONArray(TAG_PROfile);} catch (JsONException e) {    e.printstacktrace();}return null;}protected voID onPostExecute(String file_url) {// dismiss the dialog after getting all productspDialog.dismiss();// updating UI from Background Threadtest();}}}

这是我的PHP脚本：

<?PHPrequire('admin.config.inc.PHP');if (!empty($_POST)) {    //initial query    $query = "Select last_name, first_name, mIDdle_initial, designation FROM admin where username = :user";    $query_params = array(':user' => $_POST['username']);    //execute query    try {        $stmt = $db -> prepare($query);        $result = $stmt -> execute($query_params);    } catch (PDOException $ex) {        $response["success"] = 0;        $response["message"] = "Database Error!";        dIE(Json_encode($response));    }    // Finally, we can retrIEve all of the found rows into an array using fetchAll     $rows = $stmt -> fetchAll();    if ($rows) {        $response["success"] = 1;        $response["message"] = "Post Available!";        $response["user"] = array();        foreach($rows as $row) {            $user = array();            $user["designation"] = $row["designation"];            $user["mIDdlename"] = $row["mIDdle_initial"];            $user["firstname"] = $row["first_name"];            $user["lastname"] = $row["last_name"];            //update our repsonse JsON data            array_push($response["user"], $user);        }        // echoing JsON response        echo Json_encode($response);    } else {        $response["success"] = 0;        $response["message"] = "No user available!";        dIE(Json_encode($response));    }} else {}       ?> <form action="TestProfile.PHP" method="POST"> Username: <input type="text" name="username"> <input type="submit" value="submit"> </form>

这是我的PHP脚本(JsON响应)的输出：

{"success":1,"message":"Post Available!","user":[{"designation":"Student Affairs Office in charge","mIDdlename":"","firstname":"test","lastname":"test"}]}

解决方法:

这是Json对象

JsONObject Json = JsonParser.makehttpRequest(PROfile_URL, "POST",    params);

您需要在doInbackground中返回Json.返回的结果是onPostExecute的参数

然后

 test(Json);

然后在测试中,您可以解析Json

编辑：

您还需要更改

 AsyncTask<String, String, String>

至

AsyncTask<String, String, JsONObject>   

然后

protected JsONObject doInBackground(String... args) {JsONObject Json=null;      // Building ParametersSharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(AdProfile.this);String post_username = sp.getString("username", "anon");List<nameValuePair> params = new ArrayList<nameValuePair>();params.add(new BasicnameValuePair("username", post_username));// getting JsON string from URLJson = JsonParser.makehttpRequest(PROfile_URL, "POST",        params);// Check your log cat for JsON reponseLog.d("Profile JsON: ", Json.toString());try {    // profile Json object    user = Json.getJsONArray(TAG_PROfile);} catch (JsONException e) {    e.printstacktrace();}return Json;}

然后在onPostExecute

@OverrIDeprotected voID onPostExecute(JsONObject result) {super.onPOstExecute(result);// dismiss the dialog after getting all productspDialog.dismiss();// updating UI from Background Threadtest(result);}

在测试中

public voID test(JsONObject response){{       // parse response here and set text to textvIEw}

要么

您是否在doInbackgrond中解析onPostExecute中的textvIEw

编辑：

码：

public class AddProfile extends Activity {    // All xml labels    TextVIEw txtFname;    TextVIEw txtMname;    TextVIEw txtLname;    // Progress Dialog    private ProgressDialog pDialog;    // Profile Json object    JsONArray user;    JsONObject hay;    // Profile JsON url    private static final String PROfile_URL = "http://www.stagconnect.com/StagConnect/admin/TestProfile.PHP";    // ALL JsON node names    private static final String TAG_PROfile = "user";    // private static final String TAG_ID = "ID";    private static final String TAG_USERname = "username";    private static final String TAG_FirsTname = "first_name";    private static final String TAG_MIDDLEname = "mIDdle_initial";    private static final String TAG_LASTname = "last_name";    @OverrIDe    public voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.adminprofile);        txtFname = (TextVIEw) findVIEwByID(R.ID.fname);        txtMname = (TextVIEw) findVIEwByID(R.ID.lname);        txtLname = (TextVIEw) findVIEwByID(R.ID.mname);        // Loading Profile in Background Thread        new LoadProfile().execute();    }    class LoadProfile extends AsyncTask<String, String, String> {        @OverrIDe        protected voID onPreExecute() {            super.onPreExecute();            pDialog = new ProgressDialog(AddProfile.this);            pDialog.setMessage("Loading profile ...");            pDialog.setIndeterminate(false);            pDialog.setCancelable(false);            pDialog.show();        }        /**         * getting Profile JsON         * */        protected String doInBackground(String... args) {            // Building Parameters            String Json = null;            try {                List<nameValuePair> params = new ArrayList<nameValuePair>();                params.add(new BasicnameValuePair("username", "admin"));                httpClIEnt httpclIEnt = new DefaulthttpClIEnt();                httpPost httppost = new httpPost(PROfile_URL);                httppost.setEntity(new UrlEncodedFormEntity(params));                // Execute http Post Request                httpResponse response = httpclIEnt.execute(httppost);                httpentity resEntity = response.getEntity();                Json = EntityUtils.toString(resEntity);                Log.i("Profile JsON: ", Json.toString());            } catch (Exception e) {                e.printstacktrace();            }            return Json;        }        @OverrIDe        protected voID onPostExecute(String Json) {            super.onPostExecute(Json);            // dismiss the dialog after getting all products            pDialog.dismiss();            try            {            hay = new JsONObject(Json);            JsONArray user = hay.getJsONArray("user");            JsONObject jb= user.getJsONObject(0);            String firstname = jb.getString("firstname");            String mIDdlename = jb.getString("mIDdlename");            String lastname = jb.getString("lastname");            // displaying all data in textvIEw            txtFname.setText("Firstname: " + firstname);            txtMname.setText("MIDdle name: " + mIDdlename);            txtLname.setText("Last name " + lastname);            }catch(Exception e)            {                e.printstacktrace();            }        }    }}

Json

{ // Json object node     "success": 1,    "message": "Post Available!",    "user": [ // Json array user        {     // Json object node             "designation": "Student Affairs Office in-charge",            "mIDdlename": "",            "firstname": "Jose Patrick",            "lastname": "Ocampo"        }    ]}

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