Java tutorial
/******************************************************************************* * Copyright 2012 Cian Mc Govern * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. ******************************************************************************/ package com.cianmcgovern.android.ShopAndShare; import java.io.File; import java.io.IOException; import java.util.Locale; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.HttpVersion; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.mime.MultipartEntity; import org.apache.http.entity.mime.content.ContentBody; import org.apache.http.entity.mime.content.FileBody; import org.apache.http.entity.mime.content.StringBody; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.params.CoreProtocolPNames; import org.apache.http.util.EntityUtils; import android.app.Activity; import android.app.AlertDialog; import android.app.ProgressDialog; import android.content.Context; import android.content.Intent; import android.location.Address; import android.location.Geocoder; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.util.Log; import android.view.KeyEvent; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnKeyListener; import android.view.inputmethod.InputMethodManager; import android.widget.Button; import android.widget.EditText; /** * Activity that allows the user to upload the results to the server specified * in Constants * * The user can obtain their location by clicking on the search icon beside the * text field The upload will start a new activity if it doesn't get an empty * response from the server * * @author Cian Mc Govern <cian@cianmcgovern.com> * */ public class Share extends Activity { private EditText mLocationEdit, mStore; private Context mContext; private ProgressDialog mDialog; private String message; private LocationManager mLocationManager; private final Location mLocation = new Location(LocationManager.GPS_PROVIDER); private AlertDialog mGpsDialog; private Button mSearch; private LocationListener mLocationListener = null; @Override public void onCreate(Bundle savedInstanceState) { mContext = this; super.onCreate(savedInstanceState); setContentView(R.layout.share); Button upload = (Button) findViewById(R.id.uploadButton); upload.setText(R.string.upload); upload.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String userLoc = mLocationEdit.getText().toString(); String userStore = mStore.getText().toString(); // Don't allow empty text fields if (userLoc.length() > 1 && userStore.length() > 1) { runUpload(Results.getInstance(), userLoc, userStore); } else new AlertDialog.Builder(mContext).setTitle(R.string.invalidInput) .setMessage(R.string.invalidFields).show(); } }); Button cancel = (Button) findViewById(R.id.cancelShareButton); cancel.setText(R.string.cancelButton); cancel.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if (mLocationListener != null) mLocationManager.removeUpdates(mLocationListener); finish(); } }); mLocationEdit = (EditText) findViewById(R.id.enterLocation); mLocationEdit.setOnKeyListener(new OnKeyListener() { @Override public boolean onKey(View v, int keyCode, KeyEvent event) { if ((event.getAction()) == KeyEvent.ACTION_DOWN && (keyCode == KeyEvent.KEYCODE_ENTER)) { InputMethodManager in = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); in.hideSoftInputFromWindow(mLocationEdit.getApplicationWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS); return true; } return false; } }); mStore = (EditText) findViewById(R.id.enterStore); mStore.setOnKeyListener(new OnKeyListener() { @Override public boolean onKey(View v, int keyCode, KeyEvent event) { if ((event.getAction()) == KeyEvent.ACTION_DOWN && (keyCode == KeyEvent.KEYCODE_ENTER)) { InputMethodManager in = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); in.hideSoftInputFromWindow(mStore.getApplicationWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS); return true; } return false; } }); mSearch = (Button) findViewById(R.id.locationButton); mSearch.setBackgroundResource(R.drawable.search); mSearch.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mLocationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE); if (!CheckFeatures.haveGPS()) { new AlertDialog.Builder(mContext).setTitle("GPS Required") .setMessage("You must have GPS to use this feature").show(); } // Only use GPS if it is enabled else if (mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) { mSearch.setEnabled(false); mSearch.setBackgroundResource(R.drawable.world); getLocation(); } else { mGpsDialog = new AlertDialog.Builder(mContext).create(); mGpsDialog.setTitle(R.string.gpsDisabled); mGpsDialog.setMessage(mContext.getText(R.string.gpsDisabledMessage)); mGpsDialog.show(); } } }); } /** * * Gets the address using the latitude and longitude from the getLocation() * */ public void getAddress() { Geocoder geo = new Geocoder(this, Locale.ENGLISH); Address address = null; try { address = geo.getFromLocation(mLocation.getLatitude(), mLocation.getLongitude(), 1).get(0); StringBuilder fullAddress = new StringBuilder(); for (int i = 0; i < address.getMaxAddressLineIndex(); i++) { fullAddress.append(address.getAddressLine(i) + " "); } Log.v(Constants.LOG_TAG, "Got address: " + fullAddress.toString()); mLocationEdit.setText(fullAddress.toString().trim()); } catch (IOException e) { e.printStackTrace(); } mSearch.setBackgroundResource(R.drawable.search); } /** * Calls upload() in a separate thread and displays a progress dialog while * it's executing * * @param instance * The results instance to use * @param location * The location as specified by the user * @param store * The store as specified by the user * */ private void runUpload(final Results instance, final String location, final String store) { mDialog = ProgressDialog.show(this, "", "Uploading. Please wait..."); new Thread(new Runnable() { @Override public void run() { try { message = upload(instance, location, store); mDialog.dismiss(); // If we get a response that contains data then something // went wrong so we prompt the user to try again // An empty response signals a successful upload if (message.length() > 1) { Intent in = new Intent(ShopAndShare.sContext, FailedUpload.class); startActivity(in); } else { if (mLocationListener != null) mLocationManager.removeUpdates(mLocationListener); finish(); } } catch (ClientProtocolException e) { Log.e(Constants.LOG_TAG, "Encountered exception when uploading results"); e.printStackTrace(); } catch (IOException e) { Log.e(Constants.LOG_TAG, "Encountered exception when uploading results"); e.printStackTrace(); } } }).start(); } /** * Uploads the text file specified by filename * * @param instance * The results instance to use * @param location * The location as specified by the user * @param store * The store as specified by the user * @return Response message from server * @throws ClientProtocolException * @throws IOException */ private String upload(Results instance, String location, String store) throws ClientProtocolException, IOException { Log.v(Constants.LOG_TAG, "Inside upload"); HttpClient httpClient = new DefaultHttpClient(); httpClient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1); String filename = Results.getInstance().toFile(); HttpPost httpPost = new HttpPost(Constants.FULL_URL); File file = new File(filename); MultipartEntity entity = new MultipartEntity(); ContentBody cb = new FileBody(file, "plain/text"); entity.addPart("inputfile", cb); ContentBody cbLocation = new StringBody(location); entity.addPart("location", cbLocation); ContentBody cbStore = new StringBody(store); entity.addPart("store", cbStore); httpPost.setEntity(entity); Log.v(Constants.LOG_TAG, "Sending post"); HttpResponse response = httpClient.execute(httpPost); HttpEntity resEntity = response.getEntity(); String message = EntityUtils.toString(resEntity); Log.v(Constants.LOG_TAG, "Response from upload is: " + message); resEntity.consumeContent(); httpClient.getConnectionManager().shutdown(); file.delete(); return message; } /** * * Gets the location using the LocationListener and sets the class wide * location variable with the latitude and longitude Only gets the location * once and removes the listener after that result is obtained * */ public void getLocation() { LocationListener locationListener = new LocationListener() { @Override public void onLocationChanged(Location loc) { Log.v(Constants.LOG_TAG, "Got longitude: " + loc.getLongitude()); Log.v(Constants.LOG_TAG, "Got latitude: " + loc.getLatitude()); mLocation.setLongitude(loc.getLongitude()); mLocation.setLatitude(loc.getLatitude()); getAddress(); mLocationManager.removeUpdates(this); mSearch.setEnabled(true); } @Override public void onProviderDisabled(String provider) { } @Override public void onProviderEnabled(String provider) { } @Override public void onStatusChanged(String provider, int status, Bundle extras) { } }; mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener); } @Override public void onBackPressed() { if (mLocationListener != null) mLocationManager.removeUpdates(mLocationListener); finish(); } // Create options menu @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inf = getMenuInflater(); inf.inflate(R.layout.default_menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.exit: if (mLocationListener != null) mLocationManager.removeUpdates(mLocationListener); finish(); return true; case R.id.help: new HelpDialog(this, this.getText(R.string.shareHelpMessage).toString()).show(); return true; default: return super.onOptionsItemSelected(item); } } }