Example usage for android.os AsyncTask AsyncTask

List of usage examples for android.os AsyncTask AsyncTask

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Introduction

In this page you can find the example usage for android.os AsyncTask AsyncTask.

Prototype

public AsyncTask()

Source Link

Document

Creates a new asynchronous task.

Usage

From source file:com.example.m.niceproject.service.WeatherCacheService.java

public void save(Channel channel) {
    new AsyncTask<Channel, Void, Void>() {
        @Override// w ww .  j  av a2s .c  om
        protected Void doInBackground(Channel[] channels) {

            FileOutputStream outputStream;

            try {
                outputStream = context.openFileOutput(CACHED_WEATHER_FILE, Context.MODE_PRIVATE);
                outputStream.write(channels[0].toJSON().toString().getBytes());
                outputStream.close();

            } catch (IOException e) {
                // TODO: file save operation failed
            }

            return null;
        }
    }.execute(channel);
}

From source file:com.goliathonline.android.kegbot.util.BitmapUtils.java

/**
 * Only call this method from the main (UI) thread. The {@link OnFetchCompleteListener} callback
 * be invoked on the UI thread, but image fetching will be done in an {@link AsyncTask}.
 *
 * @param cookie An arbitrary object that will be passed to the callback.
 *//* www .j  a v  a2 s .com*/
public static void fetchImage(final Context context, final String url,
        final BitmapFactory.Options decodeOptions, final Object cookie,
        final OnFetchCompleteListener callback) {
    new AsyncTask<String, Void, Bitmap>() {
        @Override
        protected Bitmap doInBackground(String... params) {
            final String url = params[0];
            if (TextUtils.isEmpty(url)) {
                return null;
            }

            // First compute the cache key and cache file path for this URL
            File cacheFile = null;
            try {
                MessageDigest mDigest = MessageDigest.getInstance("SHA-1");
                mDigest.update(url.getBytes());
                final String cacheKey = bytesToHexString(mDigest.digest());
                if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
                    cacheFile = new File(Environment.getExternalStorageDirectory() + File.separator + "Android"
                            + File.separator + "data" + File.separator + context.getPackageName()
                            + File.separator + "cache" + File.separator + "bitmap_" + cacheKey + ".tmp");
                }
            } catch (NoSuchAlgorithmException e) {
                // Oh well, SHA-1 not available (weird), don't cache bitmaps.
            }

            if (cacheFile != null && cacheFile.exists()) {
                Bitmap cachedBitmap = BitmapFactory.decodeFile(cacheFile.toString(), decodeOptions);
                if (cachedBitmap != null) {
                    return cachedBitmap;
                }
            }

            try {
                // TODO: check for HTTP caching headers
                final HttpClient httpClient = SyncService.getHttpClient(context.getApplicationContext());
                final HttpResponse resp = httpClient.execute(new HttpGet(url));
                final HttpEntity entity = resp.getEntity();

                final int statusCode = resp.getStatusLine().getStatusCode();
                if (statusCode != HttpStatus.SC_OK || entity == null) {
                    return null;
                }

                final byte[] respBytes = EntityUtils.toByteArray(entity);

                // Write response bytes to cache.
                if (cacheFile != null) {
                    try {
                        cacheFile.getParentFile().mkdirs();
                        cacheFile.createNewFile();
                        FileOutputStream fos = new FileOutputStream(cacheFile);
                        fos.write(respBytes);
                        fos.close();
                    } catch (FileNotFoundException e) {
                        Log.w(TAG, "Error writing to bitmap cache: " + cacheFile.toString(), e);
                    } catch (IOException e) {
                        Log.w(TAG, "Error writing to bitmap cache: " + cacheFile.toString(), e);
                    }
                }

                // Decode the bytes and return the bitmap.
                return BitmapFactory.decodeByteArray(respBytes, 0, respBytes.length, decodeOptions);
            } catch (Exception e) {
                Log.w(TAG, "Problem while loading image: " + e.toString(), e);
            }
            return null;
        }

        @Override
        protected void onPostExecute(Bitmap result) {
            callback.onFetchComplete(cookie, result);
        }
    }.execute(url);
}

From source file:co.blustor.gatekeeperdemo.fragments.CardTaskFragment.java

private void preloadFaces() {
    new AsyncTask<Void, Void, GKFaces>() {
        @Override/*from  ww w  . java2 s .co  m*/
        protected GKFaces doInBackground(Void... params) {
            return Application.getGKFaces();
        }

        @Override
        protected void onPostExecute(GKFaces faces) {
            synchronized (mSyncObject) {
                mFaces = faces;
            }
            if (mCallbacks != null) {
                mCallbacks.onFacesReady(mFaces);
            }
        }
    }.execute();
}

From source file:tw.idv.gasolin.pycontw2012.util.BitmapUtils.java

/**
 * Only call this method from the main (UI) thread. The
 * {@link OnFetchCompleteListener} callback be invoked on the UI thread, but
 * image fetching will be done in an {@link AsyncTask}.
 * /*ww  w.  j  a v a  2s . c o  m*/
 * @param cookie
 *            An arbitrary object that will be passed to the callback.
 */
public static void fetchImage(final Context context, final String url,
        final BitmapFactory.Options decodeOptions, final Object cookie,
        final OnFetchCompleteListener callback) {
    new AsyncTask<String, Void, Bitmap>() {
        @Override
        protected Bitmap doInBackground(String... params) {
            final String url = params[0];
            if (TextUtils.isEmpty(url)) {
                return null;
            }

            // First compute the cache key and cache file path for this URL
            File cacheFile = null;
            try {
                MessageDigest mDigest = MessageDigest.getInstance("SHA-1");
                mDigest.update(url.getBytes());
                final String cacheKey = bytesToHexString(mDigest.digest());
                if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
                    cacheFile = new File(Environment.getExternalStorageDirectory() + File.separator + "Android"
                            + File.separator + "data" + File.separator + context.getPackageName()
                            + File.separator + "cache" + File.separator + "bitmap_" + cacheKey + ".tmp");
                }
            } catch (NoSuchAlgorithmException e) {
                // Oh well, SHA-1 not available (weird), don't cache
                // bitmaps.
            }

            if (cacheFile != null && cacheFile.exists()) {
                Bitmap cachedBitmap = BitmapFactory.decodeFile(cacheFile.toString(), decodeOptions);
                if (cachedBitmap != null) {
                    return cachedBitmap;
                }
            }

            try {
                // TODO: check for HTTP caching headers
                final HttpClient httpClient = SyncService.getHttpClient(context.getApplicationContext());
                final HttpResponse resp = httpClient.execute(new HttpGet(url));
                final HttpEntity entity = resp.getEntity();

                final int statusCode = resp.getStatusLine().getStatusCode();
                if (statusCode != HttpStatus.SC_OK || entity == null) {
                    return null;
                }

                final byte[] respBytes = EntityUtils.toByteArray(entity);

                // Write response bytes to cache.
                if (cacheFile != null) {
                    try {
                        cacheFile.getParentFile().mkdirs();
                        cacheFile.createNewFile();
                        FileOutputStream fos = new FileOutputStream(cacheFile);
                        fos.write(respBytes);
                        fos.close();
                    } catch (FileNotFoundException e) {
                        Log.w(TAG, "Error writing to bitmap cache: " + cacheFile.toString(), e);
                    } catch (IOException e) {
                        Log.w(TAG, "Error writing to bitmap cache: " + cacheFile.toString(), e);
                    }
                }

                // Decode the bytes and return the bitmap.
                return BitmapFactory.decodeByteArray(respBytes, 0, respBytes.length, decodeOptions);
            } catch (Exception e) {
                Log.w(TAG, "Problem while loading image: " + e.toString(), e);
            }
            return null;
        }

        @Override
        protected void onPostExecute(Bitmap result) {
            callback.onFetchComplete(cookie, result);
        }
    }.execute(url);
}

From source file:json2notification.app.MainActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    jsonView = (TextView) findViewById(R.id.json);

    notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    String wikiJson = readFile("wiki.json");
    jsonView.setText(wikiJson);// w  w w  . j  a v  a  2  s .  c  o  m
    new AsyncTask<String, Void, Void>() {
        @Override
        public Void doInBackground(String... jsons) {
            android.util.Log.d("json2notification-app", "json:" + jsons[0]);

            //Notification n = Json2Notification.from(MainActivity.this).with(jsons[0]).notification();
            //notificationManager.notify(1, n);
            //android.util.Log.d("json2notification-app", "notify:" + n);

            AndroidNotification androidNotification = AndroidNotification.parse(MainActivity.this, jsons[0]);
            android.util.Log.d("json2notification-app", "notify:" + androidNotification.android.notification);
            notificationManager.notify(1, androidNotification.android.notification);
            //android.util.Log.d("json2notification-app", "serialize:" + androidNotification.serialize());
            return null;
        }
    }.execute(wikiJson);
}

From source file:cc.softwarefactory.lokki.android.utilities.gcm.GcmHelper.java

private static void registerInBackground(final Context context) {

    new AsyncTask<Void, Void, String>() {

        @Override/*from  www .  j  ava 2 s.co m*/
        protected String doInBackground(Void... params) {

            try {
                if (gcm == null) {
                    gcm = GoogleCloudMessaging.getInstance(context);
                }
                regid = gcm.register(SENDER_ID);
                sendRegistrationIdToBackend(context);
                storeRegistrationId(context, regid);
                return "Device registered, registration ID = " + regid;

            } catch (IOException ex) {
                return "Error :" + ex.getMessage();
            }
        }

        @Override
        protected void onPostExecute(String msg) {

            Log.e(TAG, msg);
        }

    }.execute(null, null, null);

}

From source file:com.example.m.niceproject.service.YahooWeatherService.java

public void refreshWeather(String location) {

    new AsyncTask<String, Void, Channel>() {
        @Override/* ww w  .j a v  a2s.  c om*/
        protected Channel doInBackground(String[] locations) {

            String location = locations[0];

            Channel channel = new Channel();

            String YQL = String.format(
                    "select * from weather.forecast where woeid in (select woeid from geo.places(1) where text=\"%s\")",
                    location);

            String endpoint = String.format("https://query.yahooapis.com/v1/public/yql?q=%s&format=json",
                    Uri.encode(YQL));

            try {
                URL url = new URL(endpoint);

                URLConnection connection = url.openConnection();
                connection.setUseCaches(false);

                InputStream inputStream = connection.getInputStream();

                BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
                StringBuilder result = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    result.append(line);
                }

                JSONObject data = new JSONObject(result.toString());

                JSONObject queryResults = data.optJSONObject("query");

                int count = queryResults.optInt("count");

                if (count == 0) {
                    error = new LocationWeatherException("No weather information found for " + location);
                    return null;
                }

                JSONObject channelJSON = queryResults.optJSONObject("results").optJSONObject("channel");
                channel.populate(channelJSON);

                return channel;

            } catch (Exception e) {
                error = e;
            }

            return null;
        }

        @Override
        protected void onPostExecute(Channel channel) {

            if (channel == null && error != null) {
                listener.serviceFailure(error);
            } else {
                listener.serviceSuccess(channel);
            }

        }

    }.execute(location);
}

From source file:com.deployd.DeploydObject.java

public void deleteInBackground() {
    AsyncTask<JSONObject, JSONObject, JSONObject> del = new AsyncTask<JSONObject, JSONObject, JSONObject>() {

        @Override/*from w w  w. j ava  2  s .co  m*/
        protected JSONObject doInBackground(JSONObject... params) {
            // TODO Auto-generated method stub
            try {
                JSONObject result = Deployd.delete("/" + resource + "/" + DeploydObject.this.getObjectId());
                return result;
            } 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;
        }

        @Override
        protected void onPostExecute(JSONObject result) {
            // TODO Auto-generated method stub

            super.onPostExecute(result);
        }
    };
    //   del.execute(null);
}

From source file:com.example.m.niceproject.service.GoogleMapsGeocodingService.java

public void refreshLocation(Location location) {
    new AsyncTask<Location, Void, LocationResult>() {
        @Override//from  www .j  av  a2 s . c o m
        protected LocationResult doInBackground(Location... locations) {

            Location location = locations[0];

            String endpoint = String.format(
                    "https://maps.googleapis.com/maps/api/geocode/json?latlng=%s,%s&key=%s",
                    location.getLatitude(), location.getLongitude(), API_KEY);

            try {
                URL url = new URL(endpoint);

                URLConnection connection = url.openConnection();
                connection.setUseCaches(false);

                InputStream inputStream = connection.getInputStream();

                BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
                StringBuilder result = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    result.append(line);
                }

                JSONObject data = new JSONObject(result.toString());

                JSONArray results = data.optJSONArray("results");

                if (results.length() == 0) {
                    error = new ReverseGeolocationException("Could not reverse geocode "
                            + location.getLatitude() + ", " + location.getLongitude());

                    return null;
                }

                LocationResult locationResult = new LocationResult();
                locationResult.populate(results.optJSONObject(0));

                return locationResult;

            } catch (Exception e) {
                error = e;
            }

            return null;
        }

        @Override
        protected void onPostExecute(LocationResult location) {

            if (location == null && error != null) {
                listener.geocodeFailure(error);
            } else {
                listener.geocodeSuccess(location);
            }

        }

    }.execute(location);
}

From source file:org.messic.android.util.RestJSONClient.java

/**
 * Rest POST petition to the server at the url param, sending all the post parameters defiend at formData. This post
 * return an object (json marshalling) of class defined at clazz parameter. You should register a
 * {@link RestListener} in order to obtain the returned object, this is because the petition is done in an async
 * process.//  w  w w.j av a  2 s .com
 * 
 * @param url {@link string} URL to attack
 * @param formData {@link MultiValueMap}<?,?/> map of parameters to send
 * @param clazz Class<T/> class that you will marshall to a json object
 * @param rl {@link RestListener} listener to push the object returned
 */
public static <T> void post(final String url, MultiValueMap<?, ?> formData, final Class<T> clazz,
        final RestListener<T> rl) {
    final RestTemplate restTemplate = new RestTemplate();
    restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());

    HttpHeaders requestHeaders = new HttpHeaders();
    requestHeaders.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
    // Sending multipart/form-data
    requestHeaders.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
    // Populate the MultiValueMap being serialized and headers in an HttpEntity object to use for the request
    final HttpEntity<MultiValueMap<?, ?>> requestEntity = new HttpEntity<MultiValueMap<?, ?>>(formData,
            requestHeaders);

    AsyncTask<Void, Void, Void> at = new AsyncTask<Void, Void, Void>() {
        @Override
        protected Void doInBackground(Void... params) {
            try {
                ResponseEntity<T> response = restTemplate.exchange(url, HttpMethod.POST, requestEntity, clazz);
                rl.response(response.getBody());
            } catch (Exception e) {
                rl.fail(e);
            }
            return null;
        }

    };

    at.execute();
}