How to retreive data from mysql database and parse it in textview?

How to retreive data from mysql database and parse it in textview? - android

im new in programming with android , i am trying to get data from mysql database and parse it into textView , i tried to get json and it works fine. But when i try to parse it into textView it doesn't work ??
Please any help to provide ??
Here is my java method :
protected String doInBackground(Void...params){
InputStream is=null;
String result="";
try{
URL url = new URL(json_url);
HttpURLConnection httpURLConnection=(HttpURLConnection)url.openConnection();
is = new BufferedInputStream(httpURLConnection.getInputStream());
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder stringBuilder = new StringBuilder();
while((json_string = reader.readLine())!=null){
stringBuilder.append(json_string+"\n");
}
JSONObject jObject = new JSONObject(json_string);
JSONArray jArray = jObject.getJSONArray("utilisateur");
for (int i = 0; i < jArray.length();i++){
JSONObject oneObject = jArray.getJSONObject(i);
oneObject.getString("nom");//return the address
oneObject.getString("prenom");//return the name
}
reader.close();
is.close();
httpURLConnection.disconnect();
return stringBuilder.toString().trim();
}catch(IOException e){
e.printStackTrace();
}catch (JSONException e){
e.printStackTrace();
}
This is my php code :
<?php
$DB_USER='mootaz';
$DB_PASS='mootaz';
$DB_HOST='localhost';
$DB_NAME='mvoting_db_1.0.0.0';
$sql = "select * from utilisateur where role='administrateur';";
$con = mysqli_connect($DB_HOST, $DB_USER, $DB_PASS, $DB_NAME);
$result = mysqli_query($con,$sql);
$response = array();
while ($row = mysqli_fetch_array($result))
{
array_push($response,array("name"=>$row[3],"prenom"=>$row[4]));
}
echo json_encode(array("utilisateur"=>$response));
mysqli_close($con);
?>

When you getting data that store in object and then after bind data into text view like below code..
make pojo class for your response like
public class User {
private String name,addres;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddres() {
return addres;
}
public void setAddres(String addres) {
this.addres = addres;
}
}
make array list to store data like below ..
private List<User> mUserList=new ArrayList<>();
when you doInBackground method used below like ..
User user=new User();
for (int i = 0; i < jArray.length();i++){
JSONObject oneObject = jArray.getJSONObject(i);
user.setAddres(oneObject.getString("nom"));//return the address
user.setName(oneObject.getString("prenom"));//return the name
mUserList.add(user);
}
then after onPostExecute bind data.
#Override
protected void onPostExecute(Object o) {
super.onPostExecute(o);
for(User user:mUserList)
{
textview.setText(user.getAddres());
}
}

Related

JSONObject can't be correctly created

I want to get images from server into my Android app.
My first steps are:
I have this JSON string array from server
{"results":"[{\"url\":\"https:\\\/\\\/augmentedandroidapp.000webhostapp.com\\\/images\\\/kamara1.jpg\"},{\"url\":\"https:\\\/\\\/augmentedandroidapp.000webhostapp.com\\\/images\\\/kamara2.jpg\"},{\"url\":\"https:\\\/\\\/augmentedandroidapp.000webhostapp.com\\\/images\\\/kamara3.jpg\"}]"}
I got urls in my App from server with code below and working fine.
private void getURLs() {
class GetURLs extends AsyncTask<String, Void, String> {
ProgressDialog loading;
#Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(GalleryTargets.this, "Loading...", "Please Wait...", true, true);
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loading.dismiss();
Toast.makeText(GalleryTargets.this,s,Toast.LENGTH_LONG).show();
imageJSON = s;
Log.e(LOGTAG, "Succeed Read url" + imageJSON);
extractJSON(imageJSON);
}
#Override
protected String doInBackground(String... strings) {
String uri = strings[0];
BufferedReader bufferedReader = null;
try {
URL url = new URL(uri);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
StringBuilder sb = new StringBuilder();
bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String json;
while ((json = bufferedReader.readLine()) != null) {
sb.append(json);
}
return sb.toString().trim();
} catch (Exception e) {
return null;
}
}
}
GetURLs gu = new GetURLs();
gu.execute(newurl);
}
But, i want to extract json into a new JSON Object with this method below but throws the exception, Json object not created.
Any ideas why this exception happens?
Thank you in advance!
private void extractJSON(String jsonString){
try {
JSONObject jsonObject = new JSONObject(jsonString);
JSONArray jArray = jsonObject.getJSONArray("results");
for (int i = 0; i < jArray.length(); i++) {
JSONObject oneObject = jArray.getJSONObject(i);
oneObject.getString("url");//
}
Log.e(LOGTAG, "JsonArray Succeed" );
} catch (JSONException e) {
e.printStackTrace();
Log.e(LOGTAG, "JsonArray exception");
}
}

Instead of JSONArray jArray = jsonObject.getJSONArray("results");
Try JSONArray jArray = new JSONArray (jsonObject.getString("results"));
You're asking for a json array but it is a string.

There is an error on the json.. after "results": there must not be
quotes
This is correct
{"results":[{\"url\":\"https:\\\/\\\/augmentedandroidapp.000webhostapp.com\\\/images\\\/kamara1.jpg\"},{\"url\":\"https:\\\/\\\/augmentedandroidapp.000webhostapp.com\\\/images\\\/kamara2.jpg\"},{\"url\":\"https:\\\/\\\/augmentedandroidapp.000webhostapp.com\\\/images\\\/kamara3.jpg\"}]}

how to fetch json object from url in android

I want to fetch json data from json object.
My json data is:{"avg":2.5} and my android code is
public class AsyncTaskParseJson extends AsyncTask < String, String, String > {
final String TAG = "AsyncTaskParseJson.java";
// set your json string url here
String yourJsonStringUrl = "http://www.bsservicess.com/photoUpload/star_avg.php?bookName=" + book_name;
// contacts JSONArray
#Override
protected void onPreExecute() {}
#Override
protected String doInBackground(String...arg0) {
try {
JSONParser jParser = new JSONParser();
// get json string from url
JSONObject json = jParser.getJSONFromUrl(yourJsonStringUrl);
// get the array of users
JSONObject dataJsonArr = json.getJSONObject(str);
String c = dataJsonArr.getString("avg");
na = c;
starts = Float.parseFloat(c);
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String strFromDoInBg) {
super.onPostExecute(strFromDoInBg);
netRate.setRating(starts);
Toast.makeText(mybookview.this, Float.toString(starts), Toast.LENGTH_SHORT).show();
}
But somehow its not working.I have trie every tutorial and evrything but nothing works.plz help me

your getting the json data in response is as {"avg":2.5}
simple remove the below code
JSONObject dataJsonArr = json.getJSONObject(str);
String c = dataJsonArr.getString("avg");
with below line
String c = json.getString("avg");

this is for simple get data from url example:
Parse JSON from HttpURLConnection object
and if you want use library then try Volley:
tutorial link:
http://www.androidhive.info/2014/05/android-working-with-volley-library-1/

A very simple solution to your problem
String str = "{ \"avg\" :0 }";
JsonParser parser = new JsonParser();
JsonObject object = (JsonObject) parser.parse(str);
String value = object.get("avg").getAsString();
But first of all you have to correct the warning in your backend.
EDIT the complete solution
public class AsyncTaskParseJson extends AsyncTask < String, String, String > {
HttpURLConnection urlConnection;
#Override
protected String doInBackground(String...args) {
StringBuilder result = new StringBuilder();
try {
URL url = new URL("http://www.bsservicess.com/photoUpload/star_avg.php?bookName=" + book_name);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
BufferedReader reader = new BufferedReader(new InputStreamReader( in ));
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
urlConnection.disconnect();
}
return result.toString();
}
#Override
protected void onPostExecute(String result) {
JsonParser parser = new JsonParser();
JsonObject object = (JsonObject) parser.parse(result);
String value = object.get("avg").getAsString();
}
}
But first of all remove the warning from the web response!

is there anything that i don't know about Json in Code

i'm trying to do some work with methods of json in android.
i read the documentation of json and its methods but when i use them,they don't do what i expected they do.
public class getData_jason extends AsyncTask{
String KholaseKQuery;
String User;
public getData_jason(String link,String user) {
KholaseKQuery = link;
User = user;
}
#Override
protected String doInBackground(Object[] params) {
try{
URL mylink = new URL(KholaseKQuery);
URLConnection connect = mylink.openConnection();
BufferedReader read = new BufferedReader(new InputStreamReader(connect.getInputStream()));
StringBuilder sB = new StringBuilder();
String eline;
while((eline = read.readLine())!= null)
{
sB.append(eline);
}
//MainActivity.jason_rs = sB.toString();
MainActivity.result = sB.toString();
MainActivity.is = true;
JSONObject jObj;
try{
jObj = new JSONObject(MainActivity.result.replace("callback(","")).getJSONObject("response");
JSONArray jsonArray = jObj.optJSONArray("Username");
for (int i = 0;i < jsonArray.length();i++){
JSONObject jsonObject = jsonArray.getJSONObject(i);
if (jsonObject.getBoolean("ali")){
MainActivity.jason_rs = jsonObject.optString("Name");
//MainActivity.jason_rs = jsonObject.getString("Name");
}
}
}catch (Exception e){
}
}catch (Exception e){
/*Any Exception Here*/
}
return "";
}
}
when the process of reading from database is finished,in the result string is:
{"Username":["Name":"ali","Name":"hasan"]},{"Password":["aliali","hasanhasan"]}
so when i want to get ali name from the jsonObject,the value of jason_rs is null.
plz guid me what is that i don't know yet about using json or i do it wrong.

Your "json" is invalid. You can't have the same key more than once in a hash, on the other hand you also can't have keys (certainly not strings) in an array. You can validate it on http://jsonlint.com

android:how to call method from hyperlink

I am trying to click a hyperlink and call method in android programming...
But the problem is , the link is not showing up and neither the method is getting called. How to achieve this result?
I am basically a javascript/jsp developer, this is my first android application , which i am learning. Accordingly i am trying to click link and call method with parameter....
Results looking like
Java code
private class CallAPI extends AsyncTask<String, String, String> {
private String Content;
#Override
protected String doInBackground(String... params) {
String urlString=params[0]; // URL to call
String resultToDisplay = "";
InputStream in = null;
emailVerificationResult result = null;
// HTTP Get
try {
URL url = new URL(urlString);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
in = new BufferedInputStream(urlConnection.getInputStream());
System.out.println("test");
BufferedReader reader = null;
// Get the server response
reader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
// Read Server Response
while ((line = reader.readLine()) != null) {
// Append server response in string
sb.append(line + "\n");
}
// Append Server Response To Content String
Content = sb.toString();
} catch (Exception e ) {
System.out.println(e.getMessage());
return e.getMessage();
}
/****************** Start Parse Response JSON Data *************/
String OutputData = "<center><b><u>Weight Training</u></b></center><br/><br/>";
JSONObject jsonResponse;
try {
/****** Creates a new JSONObject with name/value mappings from the JSON string. ********/
jsonResponse = new JSONObject(Content);
/***** Returns the value mapped by name if it exists and is a JSONArray. ***/
/******* Returns null otherwise. *******/
JSONArray jsonMainNode = jsonResponse.optJSONArray("articleList");
/*********** Process each JSON Node ************/
int lengthJsonArr = jsonMainNode.length();
for (int i = 0; i < lengthJsonArr; i++) {
/****** Get Object for each JSON node.***********/
JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);
/******* Fetch node values **********/
String name = jsonChildNode.optString("menu_name").toString();
String number = jsonChildNode.optString("id").toString();
String date_added = jsonChildNode.optString("parent_id").toString();
OutputData += " " +
String.format("<a onClick='verifyEmail("+number+","+date_added+")'><b>"+name+"<b> "+ number+" "+ date_added+"</a> ") +"<br/><br/>";
}
/****************** End Parse Response JSON Data *************/
/* Show Parsed Output on screen (activity) */
} catch (JSONException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
resultToDisplay =OutputData ;
return resultToDisplay;
}
// This is the method that is called when the submit button is clicked
public void verifyEmail(String m,String p) {
String urlString = apiURL + "mid=" + m + "&pid=" + p;
new CallAPI().execute(urlString);
}
protected void onPostExecute(String result) {
Intent intent = new Intent(getApplicationContext(), ResultActivity.class);
intent.putExtra(EXTRA_MESSAGE, result);
startActivity(intent);
}
Update:
Instead of link, can i put a button and provide on click method and pass parameter to the method

(Thankfully) You cannot call a function using HTML tags in android. Instead try setting ClickableSpan on you you TextView to get the desired effect
SpannableString ss = new SpannableString("Click Me to do magic");
ClickableSpan clickableSpan = new ClickableSpan() {
#Override
public void onClick(View textView) {
doSomeMagic();
}
#Override
public void updateDrawState(TextPaint ds) {
super.updateDrawState(ds);
}
};
// apply the clickable span on "Click Me" part which is on index 0 -> 7
// 8 is used because it goes from a -> b-1
ss.setSpan(clickableSpan, 0, 8, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
TextView textView = (TextView) findViewById(R.id.foo);
textView.setText(ss);

JSON Get Value by Edittext

I'm trying to get JSON value by EditText.
At first I had a bunch of nullpointer exceptions, solved that. But now my function just isn't working. Been wrapping my brain over this...
I tried to create a EditText, get that value to a String, and get it over to the JSON Object. Don't know what I'm doing wrong... Or am I forgetting something?
public class MyActivity extends Activity {
TextView uid;
TextView name1;
TextView email1;
EditText edt;
Button Btngetdata;
//URL to get JSON Array
private static String url = "*";
//JSON Node Names
private static final String TAG_TAG = "tag";
private static final String TAG_ID = "id";
private static final String TAG_LAST_NAME = "last_name";
private static final String TAG_EMAIL = "country";
JSONArray user = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
Btngetdata = (Button)findViewById(R.id.getdata);
edt = (EditText)findViewById(R.id.edittext);
Btngetdata.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
new JSONParse().execute();
}
});
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
uid = (TextView)findViewById(R.id.uid);
name1 = (TextView)findViewById(R.id.name);
email1 = (TextView)findViewById(R.id.email);
pDialog = new ProgressDialog(MyActivity.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = jParser.getJSONFromUrl(url);
return json;
}
#Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
// Getting JSON Array
user = json.getJSONArray(TAG_TAG);
JSONObject c = user.getJSONObject(0);
String xyz = edt.getText().toString();
// Storing JSON item in a Variable
String id = c.getString(TAG_ID);
String name = c.getString(TAG_LAST_NAME);
String email = c.getString(TAG_EMAIL);
//Set JSON Data in TextView
uid.setText(id);
name1.setText(name);
email1.setText(email);
edt.setText(xyz);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
{"tag":[{"id":"1","first_name":"Philip","last_name":"Porter","email":"pporter0#admin.ch","country":"China","ip_address":"26.83.255.206"},{"id":"2","first_name":"Nancy","last_name":"Martin","email":"nmartin1#google.ca","country":"Colombia","ip_address":"160.93.80.1"},{"id":"3","first_name":"Ann","last_name":"Peterson","email":"apeterson2#utexas.edu","country":"China","ip_address":"251.254.74.162"},{"id":"4","first_name":"Rachel","last_name":"Clark","email":"rclark3#mayoclinic.com","country":"Brazil","ip_address":"58.218.248.5"},{"id":"5","first_name":"Heather","last_name":"Burton","email":"hburton4#creativecommons.org","country":"Ethiopia","ip_address":"244.69.119.16"},{"id":"6","first_name":"Ruth","last_name":"Lane","email":"rlane5#va.gov","country":"Brazil","ip_address":"18.173.102.54"},{"id":"7","first_name":"Andrew","last_name":"Turner","email":"aturner6#devhub.com","country":"United States","ip_address":"13.119.240.234"},{"id":"8","first_name":"Wanda","last_name":"Medina","email":"wmedina7#pagesperso-orange.fr","country":"Netherlands","ip_address":"151.139.21.237"},{"id":"9","first_name":"Robert","last_name":"Elliott","email":"relliott8#joomla.org","country":"United States","ip_address":"34.200.249.109"},{"id":"10","first_name":"Kevin","last_name":"Harrison","email":"kharrison9#nih.gov","country":"Brazil","ip_address":"106.84.164.86"}]}
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
EDIT
JSONObject c = user.getJSONObject(Integer.parseInt(xyz));
I Modified to this, im getting a response other than default 1 when base value was getJSONObject(0), but now im entering 1 and im getting 2, entering 4 getting 5..
Does anyone know how to solve this one?

If you are trying to parse the whole json array then use this.In you post execute
List<String> allid = new ArrayList<String>();
JSONArray obj= jsonResponse.getJSONArray("tag");
for (int i=0; i<obj.length(); i++) {
JSONObject actor = cast.getJSONObject(i);
String id= actor.getString("id");
allNames.add(id);
}
Then you can use a for loop to get the id in the list accordingly.
Otherwise you can do this parsing Using the Gson Library(you can download Gson library here
Just create a class in your package
public class DetailArray {
public boolean status;
public List<Detail_User> details;
public class Detail_User {
public String id;
public String first_name;
public String last_name;
public String email;
public String country;
}
}
In your post execute
Where response is the json response
DetailArray detail1 = (new Gson()).fromJson(response.toString(),
DetailArray.class);
Now Suppose , if you want to set the names in a list view then
//return a arraylist
private ArrayList<String> getName(DetailArray detail) {
ArrayList name = new ArrayList<String>();
for (int i=0;i< detail.details.size();i++) {
name.add(splitStr[i]);
}
return names;
}
Setting the array adapter and setting it to a list
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(
this,
android.R.layout.simple_list_item_1,
getName(detail);
listview.setAdapter(arrayAdapter);

For a particular position try like this
int positionToShow = Integer.parseInt(edt.getText().toString()) - 1;
user = json.getJSONArray(TAG_TAG);
for(int i = 0; i < user.length(); i++) {
if(positionToShow == i) {
JSONObject c = user.getJSONObject(i);
// Storing JSON item in a Variable
String id = c.getString(TAG_ID);
String name = c.getString(TAG_LAST_NAME);
String email = c.getString(TAG_EMAIL);
uid.setText(id);
name1.setText(name);
email1.setText(email);
}
}

i've parse your json ...acc to number entered ..and it shows exact result....refer this....
final EditText no=(EditText)findViewById(R.id.editText1);
final Button click=(Button)findViewById(R.id.button1);
click.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View arg0)
{
try
{
Toast.makeText(MainActivity.this, no.getText().toString(), 0).show();
HttpClient client=new DefaultHttpClient();
HttpGet request=new HttpGet("http://192.168.0.30/test.js");
HttpResponse response=client.execute(request);
HttpEntity entity=response.getEntity();
String json=EntityUtils.toString(entity);
JSONObject j1=new JSONObject(json);
JSONArray ja1=j1.getJSONArray("tag");
JSONObject j2=ja1.getJSONObject(Integer.parseInt(no.getText().toString())-1);
Toast.makeText(MainActivity.this, j2.getString("first_name").toString() , 0).show();
entity.consumeContent();
}
catch(Exception e)
{
e.getStackTrace();
Toast.makeText(MainActivity.this, e.toString() , 0).show();
}
}
});

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

How to retreive data from mysql database and parse it in textview? - android

Related

JSONObject can't be correctly created

how to fetch json object from url in android

is there anything that i don't know about Json in Code

android:how to call method from hyperlink

JSON Get Value by Edittext

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