Java tutorial
/*** * Copyright (c) 2012 David Garcia / Jose Antonio Gmez * mastersofandroid@gmail.com * * 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.loadsensing.app; import java.math.BigDecimal; import java.net.URLEncoder; import java.util.ArrayList; import java.util.HashMap; import org.json.JSONArray; import org.json.JSONObject; import android.content.Context; import android.content.SharedPreferences; import android.os.Bundle; import android.util.Log; import android.view.Display; import android.webkit.WebView; import android.widget.RadioGroup; import com.loadsensing.client.JsonClient; /* * Esta actividad muestra un grfico generado online con los datos del sensor consultado. * Recibe por parmetro */ public class Chart extends DashboardActivity { private String SERVER_HOST = "http://viuterrassa/Android/getValorsGrafic.php"; private String CHART_URL = "http://chart.apis.google.com/chart?"; String SensorSelected = ""; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.chart); final WebView googleChartView = (WebView) findViewById(R.id.chart); Bundle extras = null; if (savedInstanceState == null) { extras = getIntent().getExtras(); if (extras == null) { SensorSelected = null; } else { SensorSelected = extras.getString("idsensorselected"); Log.d(DEB_TAG, "Xarxa que hem triat anteriorment: " + SensorSelected); } } // Listener para generar el grfico cada vez que se escoge la opcin en // el radiobutton RadioGroup rg = (RadioGroup) findViewById(R.id.tipochart); rg.clearCheck(); rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { public void onCheckedChanged(RadioGroup group, int checkedId) { generaChart(googleChartView, checkedId, SensorSelected); } }); } private void generaChart(WebView googleChartView, int checkedId, String SensorSelected) { SharedPreferences settings = getSharedPreferences("LoadSensingApp", Context.MODE_PRIVATE); String address = SERVER_HOST + "?session=" + settings.getString("session", "") + "&id=" + SensorSelected + "&TipusGrafic=" + checkedId; ArrayList<HashMap<String, String>> valorsURL = new ArrayList<HashMap<String, String>>(); try { String jsonString = JsonClient.connectString(address); // Convertim la resposta string a un JSONArray JSONArray ValorsGrafica = new JSONArray(jsonString); // En esta llamada slo hay 1 objeto JSONObject Valors = new JSONObject(); Valors = ValorsGrafica.getJSONObject(0); String grafica = Valors.getString("ValorsGrafica"); // Sobre el string de ValorGrafica, volvemos a parsearlo JSONArray ValorGrafica = new JSONArray(grafica); for (int i = 0; i < ValorGrafica.length(); i++) { JSONObject Valor = new JSONObject(); Valor = ValorGrafica.getJSONObject(i); HashMap<String, String> valorHashMap = new HashMap<String, String>(); valorHashMap.put("date", Valor.getString("date")); valorHashMap.put("value", Valor.getString("value")); valorsURL.add(valorHashMap); } } catch (Exception e) { Log.d(DEB_TAG, "Error rebent xarxes"); } // Montamos URL String mUrl = CHART_URL; // Etiquetas eje X, columna 0 y 1 mUrl = mUrl + "chxl=0:"; for (int i = 3; i < valorsURL.size(); i += 4) { mUrl = mUrl + "|" + URLEncoder.encode(valorsURL.get(i).get("date")); } mUrl = mUrl + "|Fecha"; mUrl = mUrl + "|1:"; for (int i = 1; i < valorsURL.size(); i += 4) { mUrl = mUrl + "|" + URLEncoder.encode(valorsURL.get(i).get("date")); } // Posicin etiquetas eje Y mUrl = mUrl + "&chxp=0,30,70,110|1,10,50,90"; // Rango x,y // Coger valor mnimo y mximo float max = new Float(valorsURL.get(0).get("value")); float min = new Float(valorsURL.get(0).get("value")); for (int i = 1; i < valorsURL.size(); i++) { Float valueFloat = new Float(valorsURL.get(i).get("value")); max = Math.max(max, valueFloat); min = Math.min(min, valueFloat); } BigDecimal maxRounded = new BigDecimal(max); maxRounded = maxRounded.setScale(1, BigDecimal.ROUND_CEILING); BigDecimal minRounded = new BigDecimal(min); minRounded = minRounded.setScale(1, BigDecimal.ROUND_FLOOR); mUrl = mUrl + "&chxr=0,-5,110|1,-5,110|2," + minRounded + "," + maxRounded; // Ejes visibles mUrl = mUrl + "&chxt=x,x,y"; // Tipo de grfico mUrl = mUrl + "&cht=lxy"; // Medida del grfico Display display = getWindowManager().getDefaultDisplay(); int width = display.getWidth() - 170; int height = display.getHeight() - 390; mUrl = mUrl + "&chs=" + width + "x" + height; // Colores mUrl = mUrl + "&chco=3072F3"; // Escala mUrl = mUrl + "&chds=0,9," + minRounded + "," + maxRounded; // Valores mUrl = mUrl + "&chd=t:0"; for (int i = 1; i < valorsURL.size(); i++) { mUrl = mUrl + "," + i; } mUrl = mUrl + "|"; mUrl = mUrl + valorsURL.get(0).get("value"); for (int i = 1; i < valorsURL.size(); i++) { mUrl = mUrl + "," + valorsURL.get(i).get("value"); } // Ttulo eyenda switch (checkedId) { case R.id.radio1: mUrl = mUrl + "&chdl=Sensor+strain+(V)&chdlp=b"; break; case R.id.radio2: mUrl = mUrl + "&chdl=Excitation+power+(V)&chdlp=b"; break; case R.id.radio3: mUrl = mUrl + "&chdl=Counter+(cnts)&chdlp=b"; break; } // Estilo de lineas mUrl = mUrl + "&chls=2"; // Mrgenes mUrl = mUrl + "&chma=0,5,5,25|5"; // Marcador mUrl = mUrl + "&chm=r,FF0000,0,0,0"; Log.d(DEB_TAG, "URL Chart " + mUrl); googleChartView.loadUrl(mUrl); } }