I can't convert a string to an array!
String text = "";
String[] textsplit = {};
//Stuff
The app set the content of an online txt file in a string:
The online txt file contain: hello,my,name,is,simone
[...] //Downloading code
text = bo.toString(); //Set the content of the online file to the string
Now the string text is like this:
text = "hello,my,name,is,simone"
Now i have to convert the string to an array that must be like this:
textsplit = {"hello","my","name","is","simone"}
so the code that i use is:
textsplit = text.split(",");
But when i try to use the array the app crash! :(
For example:
textview.setText(textsplit[0]); //The text of the textview is empity
textview.setText(textsplit[1]); //The app crash
textview.setText(textsplit[2]); //The app crash
etc...
where am I wrong? thanks!
EDIT: This is the code:
new Thread() {
#Override
public void run() {
String path ="http://www.luconisimone.altervista.org/ciao.txt";
URL u = null;
try {
u = new URL(path);
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.connect();
InputStream in = c.getInputStream();
final ByteArrayOutputStream bo = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
in.read(buffer); // Read from Buffer.
bo.write(buffer); // Write Into Buffer.
runOnUiThread(new Runnable() {
#Override
public void run() {
text = bo.toString();
testo.setText("(" + text + ")");
try {
bo.close();
} catch (IOException e) {
e.printStackTrace();
}
}
});
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
// Here all variables became empity
textsplit = text.split(",");
datisplittati.setText(textsplit[0]);
Try :
String text = "hello,my,name,is,simone";
String[] textArr = text.split(Pattern.quote(","));
You can get string using AsyncTask
private class GetStringFromUrl extends AsyncTask<String, Void, String> {
ProgressDialog dialog ;
#Override
protected void onPreExecute() {
super.onPreExecute();
// show progress dialog when downloading
dialog = ProgressDialog.show(MainActivity.this, null, "Downloading...");
}
#Override
protected String doInBackground(String... params) {
// #BadSkillz codes with same changes
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(params[0]);
HttpResponse response = httpClient.execute(httpGet);
HttpEntity entity = response.getEntity();
BufferedHttpEntity buf = new BufferedHttpEntity(entity);
InputStream is = buf.getContent();
BufferedReader r = new BufferedReader(new InputStreamReader(is));
StringBuilder total = new StringBuilder();
String line;
while ((line = r.readLine()) != null) {
total.append(line + "\n");
}
String result = total.toString();
Log.i("Get URL", "Downloaded string: " + result);
return result;
} catch (Exception e) {
Log.e("Get Url", "Error in downloading: " + e.toString());
}
return null;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
// TODO change text view id for yourself
TextView textView = (TextView) findViewById(R.id.textView1);
// show result in textView
if (result == null) {
textView.setText("Error in downloading. Please try again.");
} else {
textView.setText(result);
}
// close progresses dialog
dialog.dismiss();
}
}
and use blow line every time that you want:
new GetStringFromUrl().execute("http://www.luconisimone.altervista.org/ciao.txt");
You're using new thread to get data from an url. So in runtime, data will be asynchronous.
So when you access text variable (split it), it's still not get full value (example reason: network delay).
Try to move the function split after text = bo.toString(); , I think it will work well.
Related
So I am trying to display a toast if the link that provided in "EditText" is equal to a specific link.
Else the code keep runing until result.
Thats how I tried to do(Its not detecting the link):
if (urls[0].equals ("http://api.openweathermap.org/data/2.5/weather?q=null&appid=8e19904c6a1db15924eef5084a978de7"))
{
Log.e("Test","Error!");
}
My main code,if you need anything else from the code just tell me and I will upload:
public class DownloadTask extends AsyncTask<String,Void,String>{
#Override
protected String doInBackground(final String... urls) {
Log.e("URL", "Loading url = " + urls[0]);
StringBuilder result = new StringBuilder();
if (urls[0].equals ("http://api.openweathermap.org/data/2.5/weather?q=null&appid=8e19904c6a1db15924eef5084a978de7"))
{
Log.e("Test","DSADSADASDASDAS");
}
URL url;
HttpURLConnection urlConnection = null;
try{
url = new URL(urls[0]);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream in = urlConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(in);
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in));
String line;
while ((line = bufferedReader.readLine()) != null) {
result.append(line).append("\n");
}
return result.toString();
} catch (MalformedURLException e) {
result.append("Error: MalformedURLException");
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result.toString();
}
#SuppressLint("SetTextI18n")
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
try {
JSONObject jsonObject = new JSONObject(s);
String weatherInfo = jsonObject.getString("weather");
Log.e("JSON data",""+weatherInfo);
Toast.makeText(MainActivity.this, mCityName +" has been loaded", Toast.LENGTH_SHORT).show();
JSONArray jArray = new JSONArray(weatherInfo);
for(int i = 0; 0 < jArray.length(); i++){
JSONObject partJson = jArray.getJSONObject(i);
mMain.setText("The Weather in " + mCityName + " is: " + partJson.getString("main"));
mDescription.setText("And " + partJson.getString("description"));
mMain.setVisibility(View.VISIBLE);
mDescription.setVisibility(View.VISIBLE);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
Thank you !
To show a Toast from a background thread you need to call it inside runOnUIThread like this:
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(this, "URL is the same", Toast.LENGTH_SHORT).show();
}
});
This is assuming your AsincTask is inside an activity class.
runOnUIThread is a method of Activity class, and you need a Context to show the Toast.
If your AsyncTask is in a separate class, you will need to provide an Activity as a parameter, or use an Intent to communicate with an Activity.
I want to write a android code to retrieve json array but I cannot do it. I have tried many tutorials but nothing seemed to worked. Please anyone solve this problem.
Here is the Json:
{
"total_records":"3370",
"count":100,
"records": [
{"id":"175274241",
"timestamp":"1494685823",
"state":"Telangana",
"district":"Warangal",
"market":"Mahabubabad",
"commodity":"Cotton",
"variety":"Desi",
"arrival_date":"13/05/2017",
"min_price":"4150",
"max_price":"4150",
"modal_price":"4150" }
]
}
Here is the Android code
public class MainActivity extends Activity {
// CONNECTION_TIMEOUT and READ_TIMEOUT are in milliseconds
public static final int CONNECTION_TIMEOUT = 10000;
public static final int READ_TIMEOUT = 15000;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new AsyncLogin().execute();
}
private class AsyncLogin extends AsyncTask<String, String, String> {
ProgressDialog pdLoading = new ProgressDialog(MainActivity.this);
HttpURLConnection conn;
URL url = null;
#Override
protected void onPreExecute() {
super.onPreExecute();
//this method will be running on UI thread
pdLoading.setMessage("\tLoading...");
pdLoading.setCancelable(false);
pdLoading.show();
}
#Override
protected String doInBackground(String... params) {
try {
// Enter URL address where your json file resides
// Even you can make call to php file which returns json data
url = new URL("website url");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return e.toString();
}
try {
// Setup HttpURLConnection class to send and receive data from php and mysql
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(READ_TIMEOUT);
conn.setConnectTimeout(CONNECTION_TIMEOUT);
conn.setRequestMethod("GET");
// setDoOutput to true as we recieve data from json file
conn.setDoOutput(true);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return e1.toString();
}
try {
int response_code = conn.getResponseCode();
// Check if successful connection made
if (response_code == HttpURLConnection.HTTP_OK) {
// Read data sent from server
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
StringBuilder result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
// Pass data to onPostExecute method
return (result.toString());
} else {
return ("unsuccessful");
}
} catch (IOException e) {
e.printStackTrace();
return e.toString();
} finally {
conn.disconnect();
}
}
#Override
protected void onPostExecute(String result) {
//this method will be running on UI thread
pdLoading.dismiss();
pdLoading.dismiss();
try {
List<String> categories = new ArrayList<String>();
JSONArray jArray = new JSONArray(result);
// Extract data from json and store into ArrayList as class objects
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
String str = json_data.getString("records");
Toast.makeText(MainActivity.this,str,Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
Toast.makeText(MainActivity.this,""+e,Toast.LENGTH_LONG).show();
}
}
}
}
Anyone write a android code for above json data.
If your json data is in string jsonStr.By the help of following code ,you can parse your json
try {
JSONObject jsonObj = new JSONObject(jsonStr);
String records = jsonObj.getString("total_records");
String count= jsonObj.getString("count");
// Getting JSON Array node
JSONArray records= jsonObj.getJSONArray("records");
// looping through All Contacts
for (int i = 0; i < records.length(); i++) {
JSONObject c = records.getJSONObject(i);
String id = c.getString("id");
String timestamp= c.getString("timestamp");
String state= c.getString("state");
String district= c.getString("district");
String market= c.getString("market");
String commodity= c.getString("commodity");
String variety= c.getString("variety");
String arrival_date= c.getString("arrival_date");
String min_price= c.getString("min_price");
String max_price= c.getString("max_price");
String modal_price= c.getString("modal_price");
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
I have a php script that returns this json array.
{"PID":"1","PName":"Guitar","Brand":"Fender","Price":"110","Cat#":"1","Typ#":"1"}
I am making a simple app that places these results into several text views. only one product is returned each time as above.
when I run the app I get this Error: org.json.JSONException: Value
{"Typ#":"1","Brand":"test","Cat#":"1","PName":"Test","PID":"2","Price":"120"}
of type org.json.JSONObject cannot be converted to JSONArray.
Here is my code. Is there something wrong with the json result or the code?
public class MainActivity extends ActionBarActivity {
TextView tvname;
TextView tvbrand;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvname = (TextView) findViewById(R.id.tvName);
tvbrand = (TextView) findViewById(R.id.tvBrand);
Button btnPost = (Button) findViewById(R.id.btnPost);
btnPost.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
new getPro().execute();
}
});
}//end of on create
private class getPro extends AsyncTask<String,String,Void>{
private ProgressDialog progressDialog = new ProgressDialog(MainActivity.this);
InputStream inputStream = null;
String result = "";
protected void onPreExecute() {
progressDialog.setMessage("Downloading your data...");
progressDialog.show();
progressDialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
public void onCancel(DialogInterface arg0) {
getPro.this.cancel(true);
}
});
}
#Override
protected Void doInBackground(String... strings) {
String url_select = "http://10.0.2.2/OnetoOne/getProduct.php";
ArrayList<NameValuePair> param = new ArrayList<NameValuePair>();
param.add(new BasicNameValuePair("pid", "2"));
try {
// Set up HTTP post
// HttpClient is more then less deprecated. Need to change to URLConnection
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url_select);
httpPost.setEntity(new UrlEncodedFormEntity(param));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
// Read content & Log
inputStream = httpEntity.getContent();
} catch (UnsupportedEncodingException e1) {
Log.e("UnsupportedEncodingException", e1.toString());
e1.printStackTrace();
} catch (ClientProtocolException e2) {
Log.e("ClientProtocolException", e2.toString());
e2.printStackTrace();
} catch (IllegalStateException e3) {
Log.e("IllegalStateException", e3.toString());
e3.printStackTrace();
} catch (IOException e4) {
Log.e("IOException", e4.toString());
e4.printStackTrace();
}
// Convert response to string using String Builder
try {
BufferedReader bReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"), 8);
StringBuilder sBuilder = new StringBuilder();
String line = null;
while ((line = bReader.readLine()) != null) {
sBuilder.append(line + "\n");
}
inputStream.close();
result = sBuilder.toString();
} catch (Exception e) {
Log.e("StringBuilding & BufferedReader", "Error converting result " + e.toString());
}
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
//parse JSON data
try {
JSONArray jArray = new JSONArray(result);
//JSONObject jObject = jArray.getJSONObject(0);
String anem = jArray.getJSONObject(0).getString("PName");
//String getname = jObject.getString("PName");
//String getbrand = jObject.getString("Brand");
tvname.setText(anem);
//tvbrand.setText(getbrand);
this.progressDialog.dismiss();
} catch (JSONException e) {
Log.e("JSONException", "Error: " + e.toString());
}
}
}//end of async
}//end of class
Any help would be greatly appreciated.
That's not an array it's an object
JSONObject jObject = new JSONObject(result);
String anem = jObject.getString("PName");
tvname.setText(anem);
{"Typ#":"1","Brand":"test","Cat#":"1","PName":"Test","PID":"2","Price":"120"} of type org.json.JSONObject cannot be converted to JSONArray.
You are trying to convert a JSONObject into a JSONArray, this is your error.
Use :
JSONOjbect jso = new JSONObject(result);
A JSONObject Start with { and end with }.
A JSONArray Start with [ and end with ].
In my app I have two views that parse json from my website and it works great. The last issue i have is where i am entering a number in an edit text box and attaching it to my URL to add the user to the database. That works but when that event is launched I want to parse that json. Right now it just launches the website.
My question is how do i start that intent instead of launching right to the website. I have a JSONParser and two jason activities that work great. here is my code. I am also saving the edit text field to my sd card so the user can call it again when he comes back to that view. I know how to parse the json i just do not know how to call it from the onClick event into another view.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SharedPreferences mysettings2 = PreferenceManager.getDefaultSharedPreferences(this);
String st1 = mysettings2.getString("THEME_PREF", "Blue");
if(st1.equals("Blue"))
{setTheme(R.style.Theme_Holo_blue); }
if(st1.equals("Red"))
{setTheme(R.style.Theme_Holo_red); }
if(st1.equals("Green"))
{setTheme(R.style.Theme_Holo_green); }
if(st1.equals("Wallpaper"))
{setTheme(R.style.Theme_Transparent); }
if(st1.equals("Holo"))
{setTheme(R.style.Theme_Holo); }
setContentView(R.layout.getscore);
getActionBar().setBackgroundDrawable(
getResources().getDrawable(R.drawable.divider));
edttext= (EditText)findViewById(R.id.editText1);
Button tutorial2 = (Button) findViewById(R.id.button1);
tutorial2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("http://example.com/user/"+edttext.getText() +"?token=dYG8hW5TY4LBU8jfPb10D3IcsSx8RTo6"));
startActivity(intent);
try {
File myFile = new File("/sdcard/my_IdNumber_file.txt");
myFile.createNewFile();
FileOutputStream fOut = new FileOutputStream(myFile);
OutputStreamWriter myOutWriter =
new OutputStreamWriter(fOut);
myOutWriter.append(edttext.getText());
myOutWriter.close();
fOut.close();
} catch (Exception e) {
}
}
});
btnReadSDFile = (Button) findViewById(R.id.btnReadSDFile);
btnReadSDFile.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// write on SD card file data in the text box
try {
File myFile = new File("/sdcard/my_IdNumber_file.txt");
FileInputStream fIn = new FileInputStream(myFile);
BufferedReader myReader = new BufferedReader(
new InputStreamReader(fIn));
String aDataRow = "";
String aBuffer = "";
while ((aDataRow = myReader.readLine()) != null) {
aBuffer += aDataRow + "\n";
}
edttext.setText(aBuffer);
myReader.close();
} catch (Exception e) {
}
}
this is my JSONParser activity
public class JSONParser {
static InputStream is = null;
static JSONArray jarray = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONArray getJSONFromUrl(String url) {
StringBuilder builder = new StringBuilder();
HttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse response = client.execute(httpGet);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) {
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(content));
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
} else {
Log.e("==>", "Failed to download file");
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// try parse the string to a JSON object
try {
jarray = new JSONArray( builder.toString());
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jarray;
}}
you want to parse json at the time of launching activity then parse it onCreate();
I'm a beginner with android programming.
I'm having some problem with downloading a file with android
I used Httpost, Httpget and hhtpurlconnection
the two first aren't working at all
and the the third can't download tow times
I want a way to download different xmls to string or inputstream (or something convertable to them) to parse those XMLs.
besides the method should be able to do something like this :
conn.setRequestProperty("Authorization", "Basic " + encodedStr);
because the xmls are responses from an API
Here I am putting an example how to download an image file from server. I am asuming that on your local server there is a picture folder and you are downloading pic from that..
Use following code it may help you..
public class DownloadType1 extends Activity{
String dwnload_file_path = "http://10.0.2.2/pictures/webicon.PNG";
String dest_file_path = Environment.getRootDirectory()+"/pictures/img1.png";
ProgressDialog dialog = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.download1);
}
public void onClick(View v) {
dialog = ProgressDialog.show(DownloadType1.this, "", "Downloading file...", true);
new Thread(new Runnable() {
public void run() {
downloadFile(dwnload_file_path, dest_file_path);
}
}).start();
}
public void downloadFile(String url, String dest_file_path) {
try {
File dest_file = new File(dest_file_path);
URL u = new URL(url);
URLConnection conn = u.openConnection();
int contentLength = conn.getContentLength();
DataInputStream stream = new DataInputStream(u.openStream());
byte[] buffer = new byte[contentLength];
stream.readFully(buffer);
stream.close();
DataOutputStream fos = new DataOutputStream(new FileOutputStream(dest_file));
fos.write(buffer);
fos.flush();
fos.close();
hideProgressIndicator();
} catch(FileNotFoundException e) {
hideProgressIndicator();
return;
} catch (IOException e) {
hideProgressIndicator();
return;
}
}
void hideProgressIndicator(){
runOnUiThread(new Runnable() {
public void run() {
dialog.dismiss();
}
});
}
}
Below an example that you can use to download a file. Naturally you will have to use a correct URL.
public InputStream downloadXmlFileStreamUsingUrl(final String url) {
log.info(String.format("downloadXmlFileStreamUsingUrl: %s", url));
final HttpGet getRequest = new HttpGet(url);
HttpClient client;
try {
client = new DefaultHttpClient();
final HttpResponse getResponse = client.execute(getRequest);
final int statusCode = getResponse.getStatusLine().getStatusCode();
if (statusCode != HttpStatus.SC_OK) {
log.warn("Error " + statusCode + " for URL " + url);
return null;
}
final HttpEntity getResponseEntity = getResponse.getEntity();
final InputStream content = getResponseEntity.getContent();
return content;
} catch (final IOException e) {
getRequest.abort();
log.warn("Exception in downloadXmlFileStreamUsingUrl, error for URL " + url + e, e);
}
finally {
// When HttpClient instance is no longer needed,
// shut down the connection manager to ensure
// immediate deallocation of all system resources
client.getConnectionManager().shutdown();
}
return null;
}