I made a filter and filtering the values from the couch-base. Only first time i am able to getting the right filter values, after that it is returing the previous filter values every time. So i have to clear the cache every time. Please help.
Here is my query code.
public Query getFilterQuery(final String titles, final String sender,
final String sysName, final String prosName, final String fromDate,
final String toDate) {
final SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
com.couchbase.lite.View view = database.getView(FILTER_VIEW);
if (view.getMap() == null) {
Mapper mapper = new Mapper() {
public void map(Map<String, Object> document, Emitter emitter) {
String type = (String) document.get(AppConstants.KEY_DOC_TYPE);
if (AppConstants.DOC_TYPE_MESSAGE.equals(type)) {
String message_type = (String) document.get(AppConstants.MESSAGE_TYPE);
Log.d("message_type", message_type);
if (message_type.equals("task")) {
String msgDetails = (String) document.get(AppConstants.MESSAGE_BODY);
try {
JSONObject msgObj = new JSONObject(msgDetails);
DocumentReader documentReader = mApplication
.getDocumentReader(message_type);
documentReader.setJsonObject(msgObj);
String title = (String) documentReader.getValue("task.title");
JSONArray infoArray = (JSONArray) documentReader.getValue("task.info");
String taskDate = null;
String senderName = null;
String processName = null;
for (int i = 0; i < infoArray.length(); i++) {
JSONObject jObject = infoArray
.getJSONObject(i);
String field_label = jObject
.getString(AppConstants.LABEL);
if (field_label.equals(TASK_DATE)) {
taskDate = jObject
.getString(AppConstants.FIELD_VALUE);
Log.d("taskDate", taskDate);
}
if (field_label.equals(SENDER)) {
senderName = jObject
.getString(AppConstants.FIELD_VALUE);
}
if (field_label.equals(PROCESS_NAME)) {
processName = jObject
.getString(AppConstants.FIELD_VALUE);
}
}
Date dateFrom = null;
Date dateTo = null;
try {
date = dateFormat.parse(taskDate);
Log.d("taskDate", taskDate);
if (toDate != null && fromDate != null) {
dateTo = dateFormat.parse(toDate);
dateFrom = dateFormat.parse(fromDate);
}
} catch (ParseException e) {
e.printStackTrace();
}
/*if (titles != null && titles.contains(title)) {
emitter.emit(document.get(AppConstants.MESSAGE_ID),document);
}*/
if (senderName != null && senderName.contains(sender)) {
emitter.emit(document.get(AppConstants.MESSAGE_ID),document);
}
/*if (processName != null && processName.contains(prosName)) {
emitter.emit(document.get(AppConstants.MESSAGE_ID),document);
}*/
/*if (date.before(dateTo) && date.after(dateFrom)) {
emitter.emit(document.get(AppConstants.MESSAGE_ID),document);
}*/
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
};
view.setMap(mapper, "1");
}
Query query = view.createQuery();
return query;
}
}
A Query in Couchbase-lite is split into 2 parts.
Setting up the view (basically - the index)
Running the query against the view.
You should create you view only once (your mapper) and run queries against it with a search term under startkey and endkey.
You can also do a compound index, which is basically a string compound from several keys and search by it.
If you set the map everytime you run the query-the query will not be updated, as it look at you version argument and it's always set to a string "1".
if you will change it you will get a new index for you query - but it should be used only in dev when you change your view.
Roi.
Related
My job is to maintain an application that is essentially a database for another application. the application uses ORM GreenDao.
Here is StorageUtil.getResults method which processes queries:
public static JSONArray getResults(Database database, String query) {
Cursor cursor = database.rawQuery(query, null);
JSONArray resultSet = new JSONArray();
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
int totalColumn = cursor.getColumnCount();
JSONObject rowObject = new JSONObject();
for (int i = 0; i < totalColumn; i++) {
if (cursor.getColumnName(i) != null) {
try {
if (cursor.getString(i) != null) {
if (isJSONValid(cursor.getString(i))) {
try {
JSONObject object = new JSONObject(cursor.getString(i));
rowObject.put(cursor.getColumnName(i), object);
}catch (JSONException e){
Logger.error(e);
}
} else {
rowObject.put(cursor.getColumnName(i), cursor.getString(i));
}
} else {
rowObject.put(cursor.getColumnName(i), "");
}
} catch (Exception e) {
Logger.error(e);
}
}
}
resultSet.put(rowObject);
cursor.moveToNext();
}
cursor.close();
return resultSet;
}
Here is code of one of my entities:
#Entity(nameInDb = "UI_SV_FIAS")
#Storage(description = "FIAS", table = "UI_SV_FIAS")
public class Fias {
#Id
public String LINK;
#Property(nameInDb = "F_Street")
public String F_Street;
#Property(nameInDb = "C_Full_Address")
#Index
public String C_Full_Address;
#Property(nameInDb = "C_House_Number")
public String C_House_Number;
#Property(nameInDb = "C_Building_Number")
public String C_Building_Number;
public Fias() {
}
#Generated(hash = 1534843169)
public Fias(String LINK, String F_Street, String C_Full_Address,
String C_House_Number, String C_Building_Number) {
this.LINK = LINK;
this.F_Street = F_Street;
this.C_Full_Address = C_Full_Address;
this.C_House_Number = C_House_Number;
this.C_Building_Number = C_Building_Number;
}
Problem: the table has about 2,500,000 rows and when I get a query, for example, like this one:
http://localhost:8888/table?name=UI_SV_FIAS&query=select * from UI_SV_FIAS where C_Full_Address LIKE '%Чеченская%' ORDER BY C_House_Number, C_Full_Address limit 10
my app returns results in more then 10 seconds. But what I need is less then 3 seconds for such query.
Does anyone have an idea how can I get that?
Try this:
public static JSONArray getResults(Database database, String query) {
Cursor cursor = database.rawQuery(query, null);
JSONArray resultSet = new JSONArray();
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
int totalColumn = cursor.getColumnCount();
JSONObject rowObject = new JSONObject();
for (int i = 0; i < totalColumn; i++) {
String columnName = cursor.getColumnName(i);
if (columnName != null) {
try {
String columnValue = cursor.getString(i);
if (columnValue != null) {
if (isJSONValid(columnValue)) {
try {
JSONObject object = new JSONObject(columnValue);
rowObject.put(columnName, object);
}catch (JSONException e){
Logger.error(e);
}
} else {
rowObject.put(columnName, columnValue);
}
} else {
rowObject.put(columnName, "");
}
} catch (Exception e) {
Logger.error(e);
}
}
}
resultSet.put(rowObject);
cursor.moveToNext();
}
cursor.close();
return resultSet;
}
I'm developing a recipe book and I'm implementing this method to insert my Recipe in the Database. In the for cycle I get the ingredient's name and quantity from multiples EditText, saving each of them in an Ingredient.class instance (newIngredient). Then I insert the instance into the DB and add it to an ArrayList. The followings "if conditions" are for the title, time and other Recipe's attributes. Finally, I also insert Recipe and Tag instances in the relatives DB's tables and I close DB.
public void saveRecipe() {
dbHelper = new DatabaseHelper(context);
// creating new recipe from user input
Ingredient newIngredient;
String title, childIngredient, instruction, tag;
int target, time, childQuantity, calories;
int countIngredients = parentIngredientLayout.getChildCount();
int countTags = chipGroup.getChildCount();
ArrayList<Ingredient> ingredients = null;
ArrayList<Tag> tags = null;
View childViewIng = null;
EditText childTextViewI = null;
EditText childTextViewQ = null;
// ingredients fields settings
for (int d=0; d<countIngredients; d++) {
childViewIng = parentIngredientLayout.getChildAt(d);
childTextViewI = childViewIng.findViewById(R.id.ingredientsField);
childTextViewQ = childViewIng.findViewById(R.id.quantityField);
childIngredient = childTextViewI.getText().toString();
childQuantity = Integer.parseInt(childTextViewQ.getText().toString());
newIngredient = new Ingredient(childIngredient, childQuantity);
dbHelper.insertIngredient(newIngredient);
ingredients.add(newIngredient);
}
//recipe fields settings
if (photoPath1 == null)
photoPath1 = "";
if (photoPath2 == null)
photoPath2 = "";
if (photoPath3 == null)
photoPath3 = "";
if (titleText.getText().toString().isEmpty()) {
title = "";
} else {
title = titleText.getText().toString();
}
if (targetNumber.getText().toString().isEmpty()) {
target = 0;
} else {
target = Integer.parseInt(targetNumber.getText().toString());
}
if (timeNumber.getText().toString().isEmpty()) {
time = 0;
} else {
time = Integer.parseInt(timeNumber.getText().toString());
}
if (instructionText.getText().toString().isEmpty()) {
instruction = "";
} else {
instruction = instructionText.getText().toString();
}
if (caloriesNumber.getText().toString().isEmpty()) {
calories = 0;
} else {
calories = Integer.parseInt(caloriesNumber.getText().toString());
}
if (tagName.getText().toString().isEmpty()) {
tag = "";
} else {
tag = tagName.getText().toString();
}
Recipe newRecipe = new Recipe(title, photoPath1, photoPath2, photoPath3, instruction, target, time, calories, ingredients);
Tag newTag = new Tag(tag);
dbHelper.insertRecipe(newRecipe);
dbHelper.insertTag(newTag);
dbHelper.close(); }
I found out by debugging that in this case is inserted only the first ingredient. I tried to move the FOR until the end of code, but in that case, are inserted both recipe and tag and always only the first ingredient. I think the problem is relative to the opening/closing of the DB. Can somebody help me?
Ingredient constructor:
public Ingredient(String ingredient_name, int quantity) {
this.ingredient_name = ingredient_name;
this.quantity = quantity;
}
dbHelper.insertIngredient(newIngredient) method:
public boolean insertIngredient(Ingredient ingredient) {
db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(INGREDIENT_NAME, ingredient.getIngredient_name());
contentValues.put(QUANTITY, ingredient.getQuantity());
contentValues.put(KEY_CREATED_AT, time.getTime().toString());
long result = db.insert(TBL_INGREDIENTS, null, contentValues);
//db.close();
Log.e(TAG, "Ingredient inserted!");
if (result == -1) {
return false;
} else {
return true;
}
}
Ok, thanks to your comment we got the problem :)
You are calling .add(newIngredient) on a list that you initialized with ArrayList<Ingredient> ingredients = null;
Change it to
ArrayList<Ingredient> ingredients = new ArrayList<Ingredient>();
and it will work :)
Good luck!
I want to use AsyncTask to parse JSON data For that I have Created constructor of FetchWeatherTask in ForecastFragment
ForecastFragment.java
public class ForecastFragment extends Fragment {
private ArrayAdapter<String> mForecastAdapter;
public ForecastFragment() {
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Add this line in order for this fragment to handle menu events.
setHasOptionsMenu(true);
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.forecastfragment, menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_refresh) {
updateWeather();
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// The ArrayAdapter will take data from a source and
// use it to populate the ListView it's attached to.
mForecastAdapter =
new ArrayAdapter<String>(
getActivity(),// The current context (this activity)
R.layout.list_item_forecast,// The name of the layout ID.
R.id.tv_list_item_forecast, new ArrayList<String>()); // The ID of the textview to populate.
// Log.e("weekForecast", "forecastArray: " + forecastArray + "/n" + weekForecast);
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
ListView listView = (ListView) rootView.findViewById(R.id.listview_forecast);
listView.setAdapter(mForecastAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
String forecast = mForecastAdapter.getItem(position);
Intent intent = new Intent(getActivity(), DetailActivity.class)
.putExtra(Intent.EXTRA_TEXT, forecast);
startActivity(intent);
}
});
return rootView;
}
private void updateWeather() {
// FetchWeatherTask weatherTask = new FetchWeatherTask();
FetchWeatherTask weatherTask = new FetchWeatherTask(getActivity(), mForecastAdapter);
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
String location = prefs.getString(getString(R.string.pref_location_key),
getString(R.string.pref_location_default));
weatherTask.execute(location);
}
#Override
public void onStart() {
super.onStart();
updateWeather();
}
FetchWeatherTask.java
public class FetchWeatherTask extends AsyncTask<String, Void, String[]> {
private final String LOG_TAG = FetchWeatherTask.class.getSimpleName();
private ArrayAdapter<String> mForecastAdapter;
private final Context mContext;
public FetchWeatherTask(Context context, ArrayAdapter<String> forecastAdapter) {
mContext = context;
mForecastAdapter = forecastAdapter;
}
private boolean DEBUG = true;
/* The date/time conversion code is going to be moved outside the asynctask later,
* so for convenience we're breaking it out into its own method now.
*/
private String getReadableDateString(long time) {
// Because the API returns a unix timestamp (measured in seconds),
// it must be converted to milliseconds in order to be converted to valid date.
Date date = new Date(time);
SimpleDateFormat format = new SimpleDateFormat("E, MMM d");
return format.format(date).toString();
}
/**
* Prepare the weather high/lows for presentation.
*/
private String formatHighLows(double high, double low) {
// Data is fetched in Celsius by default.
// If user prefers to see in Fahrenheit, convert the values here.
// We do this rather than fetching in Fahrenheit so that the user can
// change this option without us having to re-fetch the data once
// we start storing the values in a database.
SharedPreferences sharedPrefs =
PreferenceManager.getDefaultSharedPreferences(mContext);
String unitType = sharedPrefs.getString(
mContext.getString(R.string.pref_units_key),
mContext.getString(R.string.pref_units_metric));
if (unitType.equals(mContext.getString(R.string.pref_units_imperial))) {
high = (high * 1.8) + 32;
low = (low * 1.8) + 32;
} else if (!unitType.equals(mContext.getString(R.string.pref_units_metric))) {
Log.d(LOG_TAG, "Unit type not found: " + unitType);
}
// For presentation, assume the user doesn't care about tenths of a degree.
long roundedHigh = Math.round(high);
long roundedLow = Math.round(low);
String highLowStr = roundedHigh + "/" + roundedLow;
return highLowStr;
}
/**
* Helper method to handle insertion of a new location in the weather database.
*
* #param locationSetting The location string used to request updates from the server.
* #param cityName A human-readable city name, e.g "Mountain View"
* #param lat the latitude of the city
* #param lon the longitude of the city
* #return the row ID of the added location.
*/
long addLocation(String locationSetting, String cityName, double lat, double lon) {
long locationId;
// First, check if the location with this city name exists in the db
Cursor locationCursor = mContext.getContentResolver().query(
WeatherContract.LocationEntry.CONTENT_URI,
new String[]{WeatherContract.LocationEntry._ID},
WeatherContract.LocationEntry.COLUMN_LOCATION_SETTING + " = ?",
new String[]{locationSetting},
null);
if (locationCursor.moveToFirst()) {
int locationIdIndex = locationCursor.getColumnIndex(WeatherContract.LocationEntry._ID);
locationId = locationCursor.getLong(locationIdIndex);
} else {
// Now that the content provider is set up, inserting rows of data is pretty simple.
// First create a ContentValues object to hold the data you want to insert.
ContentValues locationValues = new ContentValues();
// Then add the data, along with the corresponding name of the data type,
// so the content provider knows what kind of value is being inserted.
locationValues.put(WeatherContract.LocationEntry.COLUMN_CITY_NAME, cityName);
locationValues.put(WeatherContract.LocationEntry.COLUMN_LOCATION_SETTING, locationSetting);
locationValues.put(WeatherContract.LocationEntry.COLUMN_COORD_LAT, lat);
locationValues.put(WeatherContract.LocationEntry.COLUMN_COORD_LONG, lon);
// Finally, insert location data into the database.
Uri insertedUri = mContext.getContentResolver().insert(
WeatherContract.LocationEntry.CONTENT_URI,
locationValues
);
// The resulting URI contains the ID for the row. Extract the locationId from the Uri.
locationId = ContentUris.parseId(insertedUri);
}
locationCursor.close();
// Wait, that worked? Yes!
return locationId;
}
/*
Students: This code will allow the FetchWeatherTask to continue to return the strings that
the UX expects so that we can continue to test the application even once we begin using
the database.
*/
String[] convertContentValuesToUXFormat(Vector<ContentValues> cvv) {
// return strings to keep UI functional for now
String[] resultStrs = new String[cvv.size()];
for (int i = 0; i < cvv.size(); i++) {
ContentValues weatherValues = cvv.elementAt(i);
String highAndLow = formatHighLows(
weatherValues.getAsDouble(WeatherEntry.COLUMN_MAX_TEMP),
weatherValues.getAsDouble(WeatherEntry.COLUMN_MIN_TEMP));
resultStrs[i] = getReadableDateString(
weatherValues.getAsLong(WeatherEntry.COLUMN_DATE)) +
" - " + weatherValues.getAsString(WeatherEntry.COLUMN_SHORT_DESC) +
" - " + highAndLow;
}
return resultStrs;
}
/**
* Take the String representing the complete forecast in JSON Format and
* pull out the data we need to construct the Strings needed for the wireframes.
* <p/>
* Fortunately parsing is easy: constructor takes the JSON string and converts it
* into an Object hierarchy for us.
*/
private String[] getWeatherDataFromJson(String forecastJsonStr,
String locationSetting)
throws JSONException {
// Now we have a String representing the complete forecast in JSON Format.
// Fortunately parsing is easy: constructor takes the JSON string and converts it
// into an Object hierarchy for us.
// These are the names of the JSON objects that need to be extracted.
// Location information
final String OWM_CITY = "city";
final String OWM_CITY_NAME = "name";
final String OWM_COORD = "coord";
// Location coordinate
final String OWM_LATITUDE = "lat";
final String OWM_LONGITUDE = "lon";
// Weather information. Each day's forecast info is an element of the "list" array.
final String OWM_LIST = "list";
final String OWM_PRESSURE = "pressure";
final String OWM_HUMIDITY = "humidity";
final String OWM_WINDSPEED = "speed";
final String OWM_WIND_DIRECTION = "deg";
// All temperatures are children of the "temp" object.
final String OWM_TEMPERATURE = "temp";
final String OWM_MAX = "max";
final String OWM_MIN = "min";
final String OWM_WEATHER = "weather";
final String OWM_DESCRIPTION = "main";
final String OWM_WEATHER_ID = "id";
try {
JSONObject forecastJson = new JSONObject(forecastJsonStr);
JSONArray weatherArray = forecastJson.getJSONArray(OWM_LIST);
JSONObject cityJson = forecastJson.getJSONObject(OWM_CITY);
String cityName = cityJson.getString(OWM_CITY_NAME);
JSONObject cityCoord = cityJson.getJSONObject(OWM_COORD);
double cityLatitude = cityCoord.getDouble(OWM_LATITUDE);
double cityLongitude = cityCoord.getDouble(OWM_LONGITUDE);
long locationId = addLocation(locationSetting, cityName, cityLatitude, cityLongitude);
// Insert the new weather information into the database
Vector<ContentValues> cVVector = new Vector<ContentValues>(weatherArray.length());
// OWM returns daily forecasts based upon the local time of the city that is being
// asked for, which means that we need to know the GMT offset to translate this data
// properly.
// Since this data is also sent in-order and the first day is always the
// current day, we're going to take advantage of that to get a nice
// normalized UTC date for all of our weather.
Time dayTime = new Time();
dayTime.setToNow();
// we start at the day returned by local time. Otherwise this is a mess.
int julianStartDay = Time.getJulianDay(System.currentTimeMillis(), dayTime.gmtoff);
// now we work exclusively in UTC
dayTime = new Time();
for (int i = 0; i < weatherArray.length(); i++) {
// These are the values that will be collected.
long dateTime;
double pressure;
int humidity;
double windSpeed;
double windDirection;
double high;
double low;
String description;
int weatherId;
// Get the JSON object representing the day
JSONObject dayForecast = weatherArray.getJSONObject(i);
// Cheating to convert this to UTC time, which is what we want anyhow
dateTime = dayTime.setJulianDay(julianStartDay + i);
pressure = dayForecast.getDouble(OWM_PRESSURE);
humidity = dayForecast.getInt(OWM_HUMIDITY);
windSpeed = dayForecast.getDouble(OWM_WINDSPEED);
windDirection = dayForecast.getDouble(OWM_WIND_DIRECTION);
// Description is in a child array called "weather", which is 1 element long.
// That element also contains a weather code.
JSONObject weatherObject =
dayForecast.getJSONArray(OWM_WEATHER).getJSONObject(0);
description = weatherObject.getString(OWM_DESCRIPTION);
weatherId = weatherObject.getInt(OWM_WEATHER_ID);
// Temperatures are in a child object called "temp". Try not to name variables
// "temp" when working with temperature. It confuses everybody.
JSONObject temperatureObject = dayForecast.getJSONObject(OWM_TEMPERATURE);
high = temperatureObject.getDouble(OWM_MAX);
low = temperatureObject.getDouble(OWM_MIN);
ContentValues weatherValues = new ContentValues();
weatherValues.put(WeatherEntry.COLUMN_LOC_KEY, locationId);
weatherValues.put(WeatherEntry.COLUMN_DATE, dateTime);
weatherValues.put(WeatherEntry.COLUMN_HUMIDITY, humidity);
weatherValues.put(WeatherEntry.COLUMN_PRESSURE, pressure);
weatherValues.put(WeatherEntry.COLUMN_WIND_SPEED, windSpeed);
weatherValues.put(WeatherEntry.COLUMN_DEGREES, windDirection);
weatherValues.put(WeatherEntry.COLUMN_MAX_TEMP, high);
weatherValues.put(WeatherEntry.COLUMN_MIN_TEMP, low);
weatherValues.put(WeatherEntry.COLUMN_SHORT_DESC, description);
weatherValues.put(WeatherEntry.COLUMN_WEATHER_ID, weatherId);
cVVector.add(weatherValues);
}
// add to database
if (cVVector.size() > 0) {
ContentValues[] cvArray = new ContentValues[cVVector.size()];
cVVector.toArray(cvArray);
mContext.getContentResolver().bulkInsert(WeatherEntry.CONTENT_URI, cvArray);
}
// Sort order: Ascending, by date.
String sortOrder = WeatherEntry.COLUMN_DATE + " ASC";
Uri weatherForLocationUri = WeatherEntry.buildWeatherLocationWithStartDate(
locationSetting, System.currentTimeMillis());
// Students: Uncomment the next lines to display what what you stored in the bulkInsert
Cursor cur = mContext.getContentResolver().query(weatherForLocationUri,
null, null, null, sortOrder);
cVVector = new Vector<ContentValues>(cur.getCount());
if (cur.moveToFirst()) {
do {
ContentValues cv = new ContentValues();
DatabaseUtils.cursorRowToContentValues(cur, cv);
cVVector.add(cv);
} while (cur.moveToNext());
}
Log.d(LOG_TAG, "FetchWeatherTask Complete. " + cVVector.size() + " Inserted");
String[] resultStrs = convertContentValuesToUXFormat(cVVector);
return resultStrs;
} catch (JSONException e) {
Log.e(LOG_TAG, e.getMessage(), e);
e.printStackTrace();
}
return null;
}
#Override
protected String[] doInBackground(String... params) {
// If there's no zip code, there's nothing to look up. Verify size of params.
if (params.length == 0) {
return null;
}
String locationQuery = params[0];
// These two need to be declared outside the try/catch
// so that they can be closed in the finally block.
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
// Will contain the raw JSON response as a string.
String forecastJsonStr = null;
String format = "json";
String units = "metric";
int numDays = 14;
try {
// Construct the URL for the OpenWeatherMap query
// Possible parameters are avaiable at OWM's forecast API page, at
// http://openweathermap.org/API#forecast
final String FORECAST_BASE_URL =
"http://api.openweathermap.org/data/2.5/forecast/daily?";
final String QUERY_PARAM = "q";
final String FORMAT_PARAM = "mode";
final String UNITS_PARAM = "units";
final String DAYS_PARAM = "cnt";
final String APPID_PARAM = "APPID";
Uri builtUri = Uri.parse(FORECAST_BASE_URL).buildUpon()
.appendQueryParameter(QUERY_PARAM, params[0])
.appendQueryParameter(FORMAT_PARAM, format)
.appendQueryParameter(UNITS_PARAM, units)
.appendQueryParameter(DAYS_PARAM, Integer.toString(numDays))
.appendQueryParameter(APPID_PARAM, BuildConfig.OPEN_WEATHER_MAP_API_KEY)
.build();
URL url = new URL(builtUri.toString());
// Create the request to OpenWeatherMap, and open the connection
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.connect();
// Read the input stream into a String
InputStream inputStream = urlConnection.getInputStream();
StringBuffer buffer = new StringBuffer();
if (inputStream == null) {
// Nothing to do.
return null;
}
reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
// Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
// But it does make debugging a *lot* easier if you print out the completed
// buffer for debugging.
buffer.append(line + "\n");
}
if (buffer.length() == 0) {
// Stream was empty. No point in parsing.
return null;
}
forecastJsonStr = buffer.toString();
} catch (IOException e) {
Log.e(LOG_TAG, "Error ", e);
// If the code didn't successfully get the weather data, there's no point in attemping
// to parse it.
return null;
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (reader != null) {
try {
reader.close();
} catch (final IOException e) {
Log.e(LOG_TAG, "Error closing stream", e);
}
}
}
try {
return getWeatherDataFromJson(forecastJsonStr, locationQuery);
} catch (JSONException e) {
Log.e(LOG_TAG, e.getMessage(), e);
e.printStackTrace();
}
// This will only happen if there was an error getting or parsing the forecast.
return null;
}
#Override
protected void onPostExecute(String[] result) {
if (result != null && mForecastAdapter != null) {
mForecastAdapter.clear();
for (String dayForecastStr : result) {
mForecastAdapter.add(dayForecastStr);
}
// New data is back from the server. Hooray!
}
}}
Though I have created constructor of FetchWeatherTask and initialized the values but still I am getting Following error:
http://i.stack.imgur.com/6elr4.png
Your
locationCursor
is null in
addLocation
method
I'm new to android and GAE and trying to create one small android app which manages inventory of vehicles. I'm stuck in a scenario where I need to get aggregated stock count for a particular dealer. The default APIs created by Google doesn't support any such functionality so I created one of my own which is working fine. But the issue is, I need to pass in filter criterion from my android app and I'm not sure how to achieve that.
My GAE code
#ApiMethod(name = "listAggregatedStock", path = "listAggregatedStock")
public CollectionResponse<AggregatedStock> listAggregatedStock(
#Nullable #Named("cursor") String cursorString,
#Nullable #Named("limit") Integer limit,
#Nullable #Named("columns") String[] columns,
#Nullable #Named("values") String[] values) {
EntityManager mgr = null;
Cursor cursor = null;
List<AggregatedStock> execute = null;
StringBuffer queryString = new StringBuffer();
queryString.append(" select date, vehicleCode, vehicleSubCode, colorCode, sum(count) from Stock as AggregatedStock ");
if(columns != null && columns.length > 0) {
queryString.append(" where ");
int i = 0;
for(String column : columns){
if(i > 0){
queryString.append(" and ");
}
queryString.append(column + " = :" + column);
i++;
}
}
queryString.append(" group by date, vehicleCode, vehicleSubCode, colorCode ");
try {
mgr = getEntityManager();
Query query = mgr.createQuery(queryString.toString());
if (cursorString != null && cursorString != "") {
cursor = Cursor.fromWebSafeString(cursorString);
query.setHint(JPACursorHelper.CURSOR_HINT, cursor);
}
if (limit != null) {
query.setFirstResult(0);
query.setMaxResults(limit);
}
if(columns != null && columns.length > 0) {
for(int i = 0; i < columns.length; i++) {
query.setParameter(columns[i], values[i]);
}
}
List<Object[]> results = (List<Object[]>) query.getResultList();
execute = new ArrayList<AggregatedStock>();
for (Object[] result : results) {
execute.add(new AggregatedStock((Date) result[0],
(String) result[1], (String) result[2],
(String) result[3], ((Long) result[4]).intValue()));
}
cursor = JPACursorHelper.getCursor(execute);
if (cursor != null)
cursorString = cursor.toWebSafeString();
// Tight loop for fetching all entities from datastore and
// accomodate
// for lazy fetch.
for (AggregatedStock obj : execute)
;
} finally {
mgr.close();
}
return CollectionResponse.<AggregatedStock> builder().setItems(execute)
.setNextPageToken(cursorString).build();
}
This is how I'm calling it from my android app
#Override
protected CollectionResponseAggregatedStock doInBackground(
String... params) {
String dealer = params[0];
String vehicle = params[1];
Stockendpoint.Builder endpointBuilder = new Stockendpoint.Builder(
AndroidHttp.newCompatibleTransport(), new JacksonFactory(),
null);
endpointBuilder = CloudEndpointUtils.updateBuilder(endpointBuilder);
CollectionResponseAggregatedStock result;
Stockendpoint endpoint = endpointBuilder.build();
try {
result = endpoint.listAggregatedStock().execute();
} catch (IOException e) {
e.printStackTrace();
result = null;
}
return result;
}
current issue I'm facing is, I'm not able to pass column and values string[]. When I add them like this
result = endpoint.listAggregatedStock(null, null, new String[]{"column"}, new String[]{"value"}).execute();
the signatures doesn't match. I'm not sure if this is the right way. I'm using cloud libraries generated by Google plug-in
I was finally able to achieve it this way
#SuppressWarnings({ "unchecked" })
#ApiMethod(name = "listAggregatedStock", path = "listAggregatedStock")
public List<AggregatedStock> listAggregatedStock(#Nonnull #Named("dealer") String dealer) {
List<AggregatedStock> execute = null;
PersistenceManager pm = getPersistenceManager();
StringBuilder sb = new StringBuilder();
sb.append(" select date, vehicleCode, vehicleSubCode, colorCode, ");
sb.append(" SUM(count) from Stock as AggregatedStock ");
Query query = pm
.newQuery(sb.toString());
query.setFilter(" updatedByDealer == " + dealer);
query.setGrouping(" date, vehicleCode, vehicleSubCode, colorCode ");
query.setOrdering(" vehicleCode desc ");
query.declareImports("import com.sandeepapplabs.dms.Stock");
try {
List<Object[]> results = (List<Object[]>) query.execute();
execute = new ArrayList<AggregatedStock>();
for (Object[] result : results) {
execute.add(new AggregatedStock((Date) result[0],
(String) result[1], (String) result[2],
(String) result[3], ((Long) result[4]).intValue()));
}
} finally {
pm.close();
}
return execute;
}
Instead of doing it GAE default way, I implemented JDO
I am parsing text and images from XML file.
Everyting is ok with text.
But when I start to parse images listview becomes empty.
for (int j = 0; j < clength; j++) {
Node thisNode = nchild.item(j);
String theString = null;
String nodeName = null;
if (thisNode != null && thisNode.getFirstChild() != null) {
theString = thisNode.getFirstChild().getNodeValue();
}
nodeName = thisNode.getNodeName();
if ("title".equals(nodeName)) {
_item.setTitle(theString);
}
if ("pubDate".equals(nodeName)) {
String formatedDate = theString.replace(" +0000", "");
_item.setDate(formatedDate);
}
if (nodeName.equals("enclosure")) {
Element enclosure = (Element) thisNode;
if (enclosure.hasAttr("url")) {
String imageLink = (enclosure.attr("url"));
_item.setImage(imageLink);
}
}
}
So, as I understand, the problem is taking data from .
How can I do this in wright way?
THNX!
So, i solves this task by this way.
String body = nodeToString(thisNode);
int urlStart = body.indexOf("url=");
int urlFinish = body.indexOf("length");
String urlImage = body.substring(urlStart+5, urlFinish-2);
_item.setImage(urlImage);
And method nodeToString:
private String nodeToString(Node node) {
StringWriter sw = new StringWriter();
try {
Transformer t = TransformerFactory.newInstance().newTransformer();
t.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
t.transform(new DOMSource(node), new StreamResult(sw));
} catch (TransformerException te) {
System.out.println("nodeToString Transformer Exception");
}
return sw.toString();
}