I'm having problem when I try to use HttpCleitn to fetch data from my server it takes a lot of time (about 30sec and response is only a few kB) and it keeps logging a messages: "Skippe xxx frames. App may be doing too much work on its main thread". There just a plenty of these messages (like a 1000 or 2000).
I'm really new to android dev and have no idea what i'm doing wrong. Though all the process of fetching data from the server is held inside the doInBackground method.
Here's all my code
public class MainActivity extends Activity {
ListView videoList;
ArrayList<String> videoArrayList;
ArrayAdapter<String> videoAdapter;
Context context;
String feedUrl = "http://www.rateksib.ru/ios/track_json.php?order=НскС101712124";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = this;
videoArrayList = new ArrayList<String>();
videoList = (ListView) findViewById(R.id.videoList);
videoAdapter = new ArrayAdapter<String>(this, R.layout.video_list_item, videoArrayList);
videoList.setAdapter(videoAdapter);
VideoListTask loaderTask = new VideoListTask();
loaderTask.execute();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public class VideoListTask extends AsyncTask<Void, Void, Void> {
ProgressDialog dialog;
#Override
protected void onPreExecute() {
dialog = new ProgressDialog(context);
dialog.setTitle("Выполняется запрос");
dialog.show();
super.onPreExecute();
}
#Override
protected void onPostExecute(Void result) {
dialog.dismiss();
videoAdapter.notifyDataSetChanged();
super.onPostExecute(result);
}
#Override
protected Void doInBackground(Void... params) {
HttpClient client = new DefaultHttpClient();
HttpGet getRequest = new HttpGet(feedUrl);
try
{
HttpResponse response = client.execute(getRequest);
StatusLine statusLine = response.getStatusLine();
if( statusLine.getStatusCode() != 200 ) {
return null;
}
InputStream jsonStream = response.getEntity().getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(jsonStream));
StringBuilder stringBuilder = new StringBuilder();
String line;
while( (line = reader.readLine()) != null ) {
stringBuilder.append(line);
}
String jsonData = stringBuilder.toString();
JSONObject json = new JSONObject(jsonData);
JSONArray results = json.getJSONArray("results");
for( int i = 0; i < results.length(); i++ ) {
JSONObject item = results.getJSONObject(i);
String status = item.getString("status");
String date = item.getString("date");
Log.i("OK:", "Detsya");
videoArrayList.add(date + ": " + status);
}
}
catch (ClientProtocolException 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 null;
}
}
}
Related
I am have sql DB and I am trying to display queried values in a listView. I created a custom adapter for the listView. problem is
I am not able to see any data displayed on my listView.
code of main
public class _songs_playlist extends AppCompatActivity {
ArrayList<songsarray> listofsoongs = new ArrayList<songsarray>();
private static int SPLASH_TIME_OUT=2000;
AlertDialog alertDialog;
private boolean loggedIn = false;
String type;
String result;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity__songs_playlist);
new JSONParse().execute();
MyCustomAdapterSongs itemsAdapter = new MyCustomAdapterSongs(this, listofsoongs);
ListView listView = (ListView) findViewById(R.id.listView1);
listView.setAdapter(itemsAdapter);
itemsAdapter.notifyDataSetChanged();
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
alertDialog=new AlertDialog.Builder(_songs_playlist.this).create();
alertDialog.setTitle("Upadting Data");
pDialog = new ProgressDialog(_songs_playlist.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected JSONObject doInBackground(String... args) {
HTTPHandler sh = new HTTPHandler();
String login_URL = "http://2f179dfb.ngrok.io/getsong.php";
try {
//Fetching the boolean value form sharedpreferences
URL url = new URL(login_URL);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
result = "";
String line = "";
while ((line = bufferedReader.readLine()) != null) {
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
Log.e("RESULT", result);
JSONObject jsonObject = new JSONObject(result);
JSONArray result1 = jsonObject.getJSONArray("result");
for (int i = 0; i < result1.length(); i++) {
JSONObject c = result1.getJSONObject(i);
String id = c.getString("songID");
String names = c.getString("songName");
String ss = c.getString("singerName");
listofsoongs.add(new songsarray(ss,id,names));
}
return jsonObject;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
if(true)
{
}
else
{
}
}
}
}
code of custom array adapter
public class MyCustomAdapterSongs extends ArrayAdapter<songsarray> {
Context context;
ArrayList<songsarray> items;
public MyCustomAdapterSongs(Activity context, ArrayList<songsarray> songsarrays) {
super(context, 0, songsarrays);
this.context=context;
this.items=songsarrays;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View listItemView = convertView;
if (listItemView == null) {
listItemView = LayoutInflater.from(getContext()).inflate(
R.layout.itemlist, parent, false);
}
TextView nameTextView = (TextView) listItemView.findViewById(R.id.textView1);
nameTextView.setText(currentAndroidFlavor.getSingername());
Log.e("hhhh", nameTextView.getText().toString());
TextView numberTextView = (TextView) listItemView.findViewById(R.id.textView2);
numberTextView.setText(currentAndroidFlavor.getSongname());
Log.e("jjjj", numberTextView.getText().toString());
CheckBox ch=(CheckBox)listItemView.findViewById(R.id.checkBox1);
ch.setSelected(currentAndroidFlavor.isSelected());
return listItemView;
}
#Override
public int getCount() {
if(items == null)
return 0;
return items.size();
}
#Override
public songsarray getItem(int i) {
return items.get(i);
}
}
Call itemsAdapter.notifyDataSetChanged() within onPostExecute.
Your list is empty until the AsyncTask finishes there.
You'll have to make the adapter a member variable of the Activity class
As in your code I can see you are updating the list in doInBackground but you are not notifying the adapter for the changes.
In onPostExecute method you need to call itemsAdapter.notifyDataSetChanged() and make sure it you are not calling it inside doInBackground as in background thread you can't to UI related work.
Check the EDITS in this code snippet
`
public class _songs_playlist extends AppCompatActivity {
ArrayList<songsarray> listofsoongs = new ArrayList<songsarray>();
private static int SPLASH_TIME_OUT=2000;
AlertDialog alertDialog;
private boolean loggedIn = false;
String type;
String result;
//EDIT 1: Make these member variables
MyCustomAdapterSongs itemsAdapter;
ListView listView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity__songs_playlist);
//EDIT 2: get references your views before AsyncTask
listView = (ListView) findViewById(R.id.listView1);
new JSONParse().execute();
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
alertDialog=new AlertDialog.Builder(_songs_playlist.this).create();
alertDialog.setTitle("Upadting Data");
pDialog = new ProgressDialog(_songs_playlist.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected JSONObject doInBackground(String... args) {
HTTPHandler sh = new HTTPHandler();
String login_URL = "http://2f179dfb.ngrok.io/getsong.php";
try {
//Fetching the boolean value form sharedpreferences
URL url = new URL(login_URL);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
result = "";
String line = "";
while ((line = bufferedReader.readLine()) != null) {
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
Log.e("RESULT", result);
JSONObject jsonObject = new JSONObject(result);
JSONArray result1 = jsonObject.getJSONArray("result");
for (int i = 0; i < result1.length(); i++) {
JSONObject c = result1.getJSONObject(i);
String id = c.getString("songID");
String names = c.getString("songName");
String ss = c.getString("singerName");
listofsoongs.add(new songsarray(ss,id,names));
}
return jsonObject;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
//EDIT 3: set your adapter here as this method will be called on the UI Thread
itemsAdapter = new MyCustomAdapterSongs(this, listofsoongs);
listView.setAdapter(itemsAdapter);
}
}
}
}
`
I have a listview populated by the data from mysql database. It works fine but when I select an item then press back , the previous listview fecth again data from database that duplicates the items in my listview.
Here's is my code :
public class CityPage extends Activity{
Activity context;
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
ProgressDialog pd;
CityAdapter cityAdapter;
ListView listCity;
ArrayList<City> records;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_city_page);
context = this;
records = new ArrayList<City>();
listCity = (ListView) findViewById(R.id.cities);
cityAdapter = new CityAdapter(context, R.layout.city_layout, R.id.city_name, records);
listCity.setAdapter(cityAdapter);
listCity.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent myIntent = new Intent(view.getContext(),City_attractions.class);
Toast.makeText(CityPage.this, "Opening", Toast.LENGTH_LONG).show();
String info1 = records.get(position).getCityName();
String info2 = records.get(position).getDescription();
myIntent.putExtra("info1", info1);
myIntent.putExtra("info2", info2);
startActivity(myIntent);
}
});
}
#Override
protected void onStart() {
super.onStart();
fetchCity fetch = new fetchCity();
fetch.execute();
}
private class fetchCity extends AsyncTask<Void, Void, Void> {
protected void onPreExecute() {
super.onPreExecute();
}
protected Void doInBackground(Void... params) {
InputStream is = null;
String result = "";
try {
httpclient = new DefaultHttpClient();
httppost = new HttpPost("http://iguideph-001-site1.btempurl.com/getcity.php");
response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
// Get our response as a String.
is = entity.getContent();
} catch (Exception e) {
if (pd != null)
pd.dismiss(); //close the dialog if error occurs
Log.e("ERROR", e.getMessage());
}
//convert response to string
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
Log.e("ERROR", "Error converting result " + e.toString());
}
//parse json data
try {
// Remove unexpected characters that might be added to beginning of the string
result = result.substring(result.indexOf(""));
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
City p = new City();
p.setCityName(json_data.getString("place_name"));
p.setDescription(json_data.getString("description"));
records.add(p);
}
} catch (Exception e) {
Log.e("ERROR", "Error pasting data " + e.toString());
}
return null;
}
protected void onPostExecute(Void result) {
if (pd != null) pd.dismiss(); //close dialog
Log.e("size", records.size() + "");
cityAdapter.notifyDataSetChanged(); //notify the ListView to get new records
}
}
}
try remove those lines from onstart() and put them inside oncreate() function
fetchCity fetch = new fetchCity();
fetch.execute();
Good luck !
I am trying to fetch some data from Web Server through JSON. I am using asynctask to do so. Normally it is taking 5-10 seconds to be shown in my ListView.
Hence I want to put spinner progress bar. My code is working fine only problem is the progress bar is not visible.
MyActivity code to call asyntask
try{
JSONObject output = new AsyncTaskJsonParse(this,status, A, B, city).execute().get();
try {
JSONObject output = new AsyncTaskJsonParse(ListViewDisplay.this,status, bgrp, antigen, city).execute().get();
JSONObject src = output.getJSONObject("data");
String flag = output.getString("success");
String flagmsg = output.getString("message");
if (flag == "1") {
JSONArray jarr_name = new JSONArray(src.getString("name"));
JSONArray jarr_fathername = new JSONArray(src.getString("fathername"));
JSONArray jarr_moh = new JSONArray(src.getString("moh"));
JSONArray jarr_city = new JSONArray(src.getString("city"));
JSONArray jarr_phone = new JSONArray(src.getString("phone"));
int n = jarr_name.length();
name_array = new String[n];
fathername_array = new String[n];
moh_array = new String[n];
phone_array = new String[n];
city_array = new String[n];
for (int i = 0; i < n; i++) {
name_array[i] = (String) jarr_name.get(i);
fathername_array[i] = (String) jarr_fathername.get(i);
moh_array[i] = (String) jarr_moh.get(i);
phone_array[i] = (String) jarr_phone.get(i);
city_array[i] = "Vadodara";
Log.d("Inside StringArray", i + "");
}
String msg = src.getString("name");
list = (ListView) findViewById(R.id.listView);
CustomListAdapter custAdaptor = new CustomListAdapter(this, name_array, fathername_array, mohalla_array, city_array, phone_array);
list.setAdapter(custAdaptor);
}else
{
Toast.makeText(this, "Data not found" + flagmsg, Toast.LENGTH_LONG).show();
}
}catch(ExecutionException e){
// TODO Auto-generated catch block
e.printStackTrace();
}
catch(InterruptedException e)
{
e.printStackTrace();
}catch(JSONException je)
{
}
Standalone asyntask with progressbar code
public class AsyncTaskJsonParse extends AsyncTask<String, String, JSONObject>
{
String A,B;
private String url = "abc.com/check.php";
List<NameValuePair> param=new ArrayList<NameValuePair>();
private Context context;
private ProgressDialog progress;
public AsyncTaskJsonParse(Context context,String A,String B,String antigen,String city)
{
this.A=A;
this.B=B;
this.city=city;
this.context=context;
progress=new ProgressDialog(context);
}
#Override
protected void onPreExecute() {
super.onPreExecute();
Log.e("In preexecution ", "Preexecution 1");
progress.setMessage("Processing...");
progress.setIndeterminate(true);
progress.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progress.setCancelable(true);
Log.e("In preexecution azam", "Preexecution 2");
progress.show();
if(progress.isShowing())
{
Log.d("In preexecution ", "Showing 2");
}
}
//rest of code i.e. doInBackground and postexecute come after this.
#Override
protected JSONObject doInBackground(String... arg0) {
// TODO Auto-generated method stub
try
{
JsonParsor parse=new JsonParsor();
Log.d("diInbackgrnd ","Dialog box");
jsonobj = parse.getJSONFromUrl(url, param);
}
catch(Exception e)
{
Log.e(TAG, " "+e );
}
return jsonobj;
}
#Override
protected void onPostExecute(JSONObject result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
//pDialog.dismiss();
if(progress.isShowing())
{
Log.e("In onPost ", "Showing 2");
}
progress.dismiss();
}
}
In my log I can see the message "In preexecution Showing 2". And the appliaction is working as expected but the Spinner progressbar is not visible.
Note: I did not add any progressbar component in any xml file. Does i need to add it? if yes then where and how?
class JsonParser.java
public class JsonParsor {
final String TAG = "JsonParser.java";
static InputStream is = null;
static JSONObject jObj = null;
static String str = "";
public JSONObject getJSONFromUrl(String url,List<NameValuePair> params) {
try {
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(url);
post.setEntity(new UrlEncodedFormEntity(params));
HttpResponse response = client.execute(post);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try
{
BufferedReader br=new BufferedReader(new InputStreamReader(is,"iso-8859-1"), 8);
StringBuilder builder=new StringBuilder();
String line=null;
while((line=br.readLine())!=null)
{
builder.append(line + "\n");
}
is.close();
str=builder.toString();
}
catch(Exception e)
{
}
try {
jObj=new JSONObject(str);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return jObj;
}
}
I suspect your problem is that your AsyncTask finishes immediately as parse.getJSONFromUrl... is also Async. So whats happening is that progress.dismiss(); in onPostExecute invoked also immediately.
Try removing progress.dismiss(); from onPostExecute and see what happens
This should work. But without the progress.setMessage("Processing...");
You can still set that.
#Override
protected void onPreExecute() {
super.onPreExecute();
dialog = new ProgressDialog(getActivity(),R.style.MyTheme);
dialog.setCancelable(false);
dialog.setProgressStyle(android.R.style.Widget_ProgressBar_Small);
dialog.show();
}
I've been having a lot of problems making this code work.
My main activity uses ZXing to scan a barcode, and then I want to take the result of that scan and query my API with it. I know I have to use an AsyncTask to do this, but I've never used one before and I'm having a lot of trouble with it. My goal is to query the API within the AsyncTask, and then update my upcTxt TextView element with the resulting JSON String. What am I supposed to do next in my ReadJSON code?
Here's my main activity code:
public class Barcode extends Activity implements OnClickListener {
private Button scanBtn;
private TextView formatTxt, contentTxt, upcTxt;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_barcode);
scanBtn = (Button)findViewById(R.id.scan_button);
formatTxt = (TextView)findViewById(R.id.scan_format);
contentTxt = (TextView)findViewById(R.id.scan_content);
upcTxt = (TextView)findViewById(R.id.upc);
scanBtn.setOnClickListener(this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.barcode, menu);
return true;
}
public void onClick(View v){
//respond to clicks
if(v.getId()==R.id.scan_button){
//scan
IntentIntegrator scanIntegrator = new IntentIntegrator(this);
scanIntegrator.initiateScan();
}
}
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
//retrieve scan result
IntentResult scanningResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
if (scanningResult != null) {
//we have a result
String scanResult = scanningResult.getContents();
String scanFormat = scanningResult.getFormatName();
formatTxt.setText("FORMAT: " + scanFormat);
contentTxt.setText("CONTENT: " + scanResult);
new ReadJSON().execute(new String[] {scanResult});
} else {
Toast toast = Toast.makeText(getApplicationContext(), "No scan data received!", Toast.LENGTH_LONG);
toast.show();
}
}}
And here is my ReadJSON code:
public class ReadJSON extends AsyncTask<String, Void, Void> {
private String content;
private TextView upcTxt;
private String url;
#Override
protected Void doInBackground(String... scanResult) {
url = "REDACTED";
content = "";
HttpClient Client = new DefaultHttpClient();
HttpGet httpget = new HttpGet(url + scanResult[0]);
ResponseHandler<String> responseHandler = new BasicResponseHandler();
try {
content = Client.execute(httpget, responseHandler);
// Update upcTxt here
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
Thank you in advance.
Update: Whenever I try to run the code on my phone, I can scan the barcode just fine but then the program crashes once it tries to access the URL.
LogCat:
01-18 17:26:44.731: E/AndroidRuntime(24876): at com.peter.barcodetest.ReadJSON.doInBackground(ReadJSON.java:30)
01-18 17:26:44.731: E/AndroidRuntime(24876): at com.peter.barcodetest.ReadJSON.doInBackground(ReadJSON.java:1)
01-18 17:26:46.473: D/CrashAnrDetector(376): processName: com.peter.barcodetest
01-18 17:26:46.473: D/CrashAnrDetector(376): broadcastEvent : com.peter.barcodetest data_app_crash
01-18 17:26:46.913: D/PackageBroadcastService(26662): Received broadcast action=android.intent.action.PACKAGE_REPLACED and uri=com.peter.barcodetest
01-18 17:26:55.122: I/ActivityManager(376): Process com.peter.barcodetest (pid 24876) (adj 13) has died.
I changed your code to this:
Edited ReadJSON only
AsyncTask (edited)
public class ReadJSON extends AsyncTask<String, Integer, String> {
private String content;
private TextView upcTxt;
private String url;
private static final String TAG = "ReadJSON";
String s = "";
Context context;
ReadJSONCallBack callback;
public ReadJSONTask (Context context, ReadJSONCallBack cb) {
super();
this.callback = cb;
this.context = context;
}
#Override
protected String doInBackground(String... scanResult) {
url = "REDACTED";
HttpClient Client = new DefaultHttpClient();
HttpGet httpget = new HttpGet(url + scanResult[0]);
try {
HttpResponse response = Client.execute(httpget);
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
InputStream in = response.getEntity().getContent();
Log.d(TAG, "Got response");
InputStreamReader inputStreamReader = new InputStreamReader(in);
BufferedReader bufferedReader = new BufferedReader(
inputStreamReader);
StringBuilder stringBuilder = new StringBuilder();
String bufferedStrChunk = null;
while ((bufferedStrChunk = bufferedReader.readLine()) != null) {
stringBuilder.append(bufferedStrChunk);
}
Log.d(TAG, "Content: " + stringBuilder.toString());
return stringBuilder.toString();
// Update upcTxt here
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
protected void onPostExecute(String result) {
callback.setString(s);
}
// method for parsing JSON object
public String parseJSONObject(String output) {
try {
JSONArray jArray = new JSONArray(output);
for (int i = 0; i < jArray.length(); i++) {
JSONObject jObject = jArray.getJSONObject(i);
String id = jObject.getString("id");
String customer = jObject.getString("name");
String description = jObject.getString("description");
Long time = (Long) jObject.get("timeAsDate");
// do something
}
} catch (JSONException e) {
}
return description;
}
}
I success show my data from web service JSON in listview, but I want to add Asyntask.
Where I can put code Asyntask in my code.
This my code to show data in list view
public class Jadwal_remix extends ListActivity {
String v_date;
JSONArray r_js = null;
ArrayList<HashMap<String, String>> myArray = new ArrayList<HashMap<String,String>>();
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
String status ="";
String date = "";
String result = "";
String url = "http://10.0.2.2/remix/view_list.php";
JSONParser jParser = new JSONParser();
JSONObject json = jParser.AmbilJson(url);
try
{
r_js = json.getJSONArray("view_list");
for (int i =0; i < r_js.length(); i++)
{
String my_array = "";
JSONObject ar = r_js.getJSONObject(i);
status = ar.getString("st");
date = ar.getString("date");
result = ar.getString("result");
if (status.trim().equals("er"))
{
my_array += "Sorry "+result;
HashMap<String, String> map = new HashMap<String, String>();
map.put("result", my_array);
myArray.add(map);
}
else
{
my_array += "Date : "+date+" "+"Result : "+result;
HashMap<String, String> map = new HashMap<String, String>();
map.put("result", my_array);
myArray.add(map);
}
}
}
catch (JSONException e)
{
e.printStackTrace();
}
adapter_listview();
}
public void adapter_listview() {
ListAdapter adapter = new SimpleAdapter(this, jadwalRemix,R.layout.my_list,new String[] { "result"}, new int[] {R.id.txtResult});
setListAdapter(adapter);
}
}
And this JSONParser
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject AmbilJson(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;
}
}
Where can I put code for Asyntask?
Ok, I get sample code, and my code now like this
public class Jadwal_remix extends ListActivity {
String v_date;
JSONArray r_js = null;
ArrayList<HashMap<String, String>> myArray = new ArrayList<HashMap<String,String>>();
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
private class myProses extends AsyncTask<Void, Void, Void> {
ProgressDialog dialog;
protected void onPreExecute() {
dialog = ProgressDialog.show(Jadwal_remix.this, "", "Loading... Please wait", true);
}
protected Void doInBackground(Void... params) {
String status ="";
String date = "";
String result = "";
String url = "http://10.0.2.2/remix/view_list.php";
JSONParser jParser = new JSONParser();
JSONObject json = jParser.AmbilJson(url);
try
{
r_js = json.getJSONArray("view_list");
for (int i =0; i < r_js.length(); i++)
{
String my_array = "";
JSONObject ar = r_js.getJSONObject(i);
status = ar.getString("st");
date = ar.getString("date");
result = ar.getString("result");
if (status.trim().equals("er"))
{
my_array += "Sorry "+result;
HashMap<String, String> map = new HashMap<String, String>();
map.put("result", my_array);
myArray.add(map);
}
else
{
my_array += "Date : "+date+" "+"Result : "+result;
HashMap<String, String> map = new HashMap<String, String>();
map.put("result", my_array);
myArray.add(map);
}
}
}
catch (JSONException e)
{
e.printStackTrace();
}
return null;
protected void onPostExecute(Void unused) {
adapter_listview();
dialog.dismiss();
}
}
public void adapter_listview() {
ListAdapter adapter = new SimpleAdapter(this, jadwalRemix,R.layout.my_list,new String[] { "result"}, new int[] {R.id.txtResult});
setListAdapter(adapter);
}
}
I'm get problem when server is die, it still loading.
How I can show message ex: can't connect to server?
Working ASyncTask tutorial,
Full ASyncTask Eclipse Project,
and here's some code that I think, when mixed with the above sample, will get you the result with the list that you desire (you'll have to adapt it to your needs a bit, though (pay attention to the list stuff, even though this is from a custom Dialog:
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Kies Facebook-account");
builder.setNegativeButton("Cancel", this);
LayoutInflater inflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View dialogLayout = inflater.inflate(R.layout.dialog, null);
builder.setView(dialogLayout);
final String[] items = {"Red", "Green", "Blue" };
builder.setAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, items),
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Log.v("touched: ", items[which].toString());
}}
);
return builder.create();
}
This is my code please try this one,
MAinActivity.java
public class MyActivity extends Activity {
private ListView contests_listView;
private ProgressBar pgb;
ActivitiesBean bean;
ArrayList<Object> listActivities;
ActivityAdapter adapter;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_listview);
contests_listView = (ListView) findViewById(R.id.activity_listView);
pgb = (ProgressBar) findViewById(R.id.contests_progressBar);
listActivities = new ArrayList<Object>();
new FetchActivitesTask().execute();
}
public class FetchActivitesTask extends AsyncTask<Void, Void, Void> {
int i =0;
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pgb.setVisibility(View.VISIBLE);
}
#Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
String url = "Your URL Here";
String strResponse = util.makeWebCall(url);
try {
JSONObject objResponse = new JSONObject(strResponse);
JSONArray jsonnodes = objResponse.getJSONArray(nodes);
for (i = 0; i < jsonnodes.length(); i++)
{
String str = Integer.toString(i);
Log.i("Value of i",str);
JSONObject jsonnode = jsonnodes.getJSONObject(i);
JSONObject jsonnodevalue = jsonnode.getJSONObject(node);
bean = new ActivitiesBean();
bean.title = jsonnodevalue.getString(title);
bean.image = jsonnodevalue.getString(field_activity_image_fid);
listActivities.add(bean);
}
}
catch (JSONException e) {
e.printStackTrace();
}
return null;
}
#Override
public void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
pgb.setVisibility(View.GONE);
displayAdapter();
}
}
public void displayAdapter()
{
adapter = new ActivityAdapter(this, listActivities);
contests_listView.setAdapter(adapter);
contests_listView.setOnItemClickListener(new OnItemClickListener() {
//#Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long id) {
// your onclick Activity
}
});
}
}
util.class
public static String makeWebCall(String url) {
DefaultHttpClient client = new DefaultHttpClient();
HttpGet httpRequest = new HttpGet(url);
// HttpPost post = new HttpPost(url);
try {
HttpResponse httpResponse = client.execute(httpRequest);
final int statusCode = httpResponse.getStatusLine().getStatusCode();
if (statusCode != HttpStatus.SC_OK) {
return null;
}
HttpEntity entity = httpResponse.getEntity();
InputStream instream = null;
if (entity != null) {
instream = entity.getContent();
}
return iStream_to_String(instream);
}
catch (IOException e) {
httpRequest.abort();
// Log.w(getClass().getSimpleName(), "Error for URL =>" + url, e);
}
return null;
}
public static String iStream_to_String(InputStream is1) {
BufferedReader rd = new BufferedReader(new InputStreamReader(is1), 4096);
String line;
StringBuilder sb = new StringBuilder();
try {
while ((line = rd.readLine()) != null) {
sb.append(line);
}
rd.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String contentOfMyInputStream = sb.toString();
return contentOfMyInputStream;
}
}
ActivityBean.java
public class ActivitiesBean implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
public String title;
public String image;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}