I want to set JSon data in cache for be available offline and to reduce load time. So, I've made a AsyncTask with this post: How to Cache Json data to be available offline?
My application has store data in the offline file (I think because I have data in cache), but it don't parse it when I reload the app. So when I reload the application, it reparse data from internet and not from the cache file. So I want that the application parse the old data with the cache and look if we have new data to download from the URL.
This is my code:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/* Navigation Sample */
toolbar = (Toolbar) findViewById(R.id.tool_bar);
setSupportActionBar(toolbar);
mRecyclerView = (RecyclerView) findViewById(R.id.RecyclerView); // Assigning the RecyclerView Object to the xml View
mRecyclerView.setHasFixedSize(true); // Letting the system know that the list objects are of fixed size
mAdapter = new MyAdapter(TITLES,ICONS,NAME,EMAIL,PROFILE); // Creating the Adapter of MyAdapter class(which we are going to see in a bit)
mRecyclerView.setAdapter(mAdapter); // Setting the adapter to RecyclerView
mLayoutManager = new LinearLayoutManager(this); // Creating a layout Manager
mRecyclerView.setLayoutManager(mLayoutManager); // Setting the layout Manager
Drawer = (DrawerLayout) findViewById(R.id.DrawerLayout); // Drawer object Assigned to the view
mDrawerToggle = new ActionBarDrawerToggle(this,Drawer,toolbar,R.string.openDrawer,R.string.closeDrawer){
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
// code here will execute once the drawer is opened( As I dont want anything happened whe drawer is
// open I am not going to put anything here)
}
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
// Code here will execute once drawer is closed
}
}; // Drawer Toggle Object Made
Drawer.setDrawerListener(mDrawerToggle); // Drawer Listener set to the Drawer toggle
mDrawerToggle.syncState(); // Finally we set the drawer toggle sync State
// My App
mListView = (ListView) findViewById(list1);
imagearticle = (ImageView) findViewById(R.id.imagearticleaccueil);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
new TheTask().execute();
}
class TheTask extends AsyncTask<Void, Void, JSONArray> {
ProgressDialog pd;
@Override
protected void onPostExecute(JSONArray result) {
super.onPostExecute(result);
pd.dismiss();
Log.i("4", "ok");
try
{
Log.i("5", "ok");
for(int i=0;i<result.length();i++)
{
json_data = result.getJSONObject(i);
try {
URL imageURL = new URL("http://" + json_data.getString("article_thumbnail"));
HttpURLConnection connection = (HttpURLConnection) imageURL.openConnection();
InputStream inputStream = connection.getInputStream();
bitmap = BitmapFactory.decodeStream(inputStream);
Log.i("6", "ok");
} catch (MalformedURLException e) {
Log.i("chargementimage", "" + e.toString());
} catch (IOException e) {
e.printStackTrace();
}
HashMap<String,Object> temp=new HashMap<String, Object>();
temp.put("id", json_data.getString("article_id"));
temp.put("picture", bitmap);
temp.put("nom", json_data.getString("article_title").replaceAll("'", "'"));
temp.put("client", json_data.getString("username"));
donnees.add(temp);
Log.i("7", "ok");
}
Log.i("8", "ok");
adapter = new SimpleAdapter(getBaseContext(),donnees,
R.layout.list_article,new String[]{"picture", "nom","client"},new int[] {R.id.imagearticleaccueil, R.id.nom, R.id.client});
adapter.setViewBinder(new MyViewBinder());
mListView.setAdapter(adapter);
Log.i("9", "ok");
}
catch(JSONException e){
Log.i("tagjsonexp", "" + e.toString());
}
}
@Override
protected void onPreExecute() {
super.onPreExecute();
pd = ProgressDialog.show(MainActivity.this, "State",
"Loading...", true);
}
@Override
protected JSONArray doInBackground(Void... arg0) {
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(strURL);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
Log.e("log_tag", "Error in http connection " + e.toString());
}
// Convert response to string
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"UTF-8"));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
writeToFile(result);
Log.i("1", "ok");
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
}
try {
jArray = new JSONArray(result);
Log.i("2", "ok");
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
try {
jArray = new JSONArray(readFromFile());
Log.i("3", "ok");
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
return jArray;
}
}
private void writeToFile(String data) {
try {
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput("config.txt", Context.MODE_PRIVATE));
outputStreamWriter.write(data);
outputStreamWriter.close();
}
catch (IOException e) {
Log.e("Exception", "File write failed: " + e.toString());
}
}
private String readFromFile() {
String ret = "";
try {
InputStream inputStream = openFileInput("config.txt");
if ( inputStream != null ) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
while ( (receiveString = bufferedReader.readLine()) != null ) {
stringBuilder.append(receiveString);
}
inputStream.close();
ret = stringBuilder.toString();
}
} catch (FileNotFoundException e) {
Log.e("login activity", "File not found: " + e.toString());
} catch (IOException e) {
Log.e("login activity", "Can not read file: " + e.toString());
}
return ret;
}
Thanks
