问题
I'm trying to display information got from wifi scan with broadcast receiver ,into a bar chart using achartengine. Well i want to have a real time chart ,every time i receive data from onReceive() method ,i update the chart. To achaeive that ,i create the chart objects in the onReceive() method .But i just get a chart with the first result ,there is no update ,although i can see the changes on the wifi scan. I would like to know what is the problem. This is the code that i'm using:
public class WifiChartsRealTime extends Activity {
LinearLayout layout;
List<int[]> values = new ArrayList<int[]>();
//List<ScanResult> classObject = new ArrayList<ScanResult>();
int [ ] [ ] Center_Frequency_2 = { { 1,2,3,4,5,6,7,8,9,10,11,12,13,14 },
{ 2412, 2417, 2422, 2427, 2432,2437,2442,2447,2452 ,2457,2462,2467,2472,2484},
};
WifiManager wifi;
Button enab;
String resultsString ;
String[] myStringArray;
int aa = 10;
public class Receiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
int length ;
if(intent.getAction().equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)){
List<ScanResult> results = wifi.getScanResults();
length=results.size();
Toast.makeText(getApplicationContext(),
"resultsString***************** :"+results , Toast.LENGTH_LONG)
.show();
Toast.makeText(getApplicationContext(),
"length1 :"+length , Toast.LENGTH_LONG)
.show();
Log.i("length1",length +"");
XYMultipleSeriesRenderer renderer = getTruitonBarRenderer(results.size());
myChartSettings(renderer);
/* Intent intent1 = ChartFactory.getBarChartIntent(WifiChartsRealTime.this,getTruitonBarDataset(),renderer,Type.DEFAULT);
startActivity(intent1);*/
GraphicalView mChartView = ChartFactory.getBarChartView(WifiChartsRealTime.this, getTruitonBarDataset( results), renderer, Type.STACKED);
layout.addView(mChartView);
// mChartView.refreshDrawableState();
mChartView.repaint();
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_wifi_charts_real_time);
layout = (LinearLayout) findViewById(R.id.chart);
ConnectivityManager cxMgr = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
wifi = (WifiManager)getSystemService(Context.WIFI_SERVICE);
Receiver receiver = new Receiver();
registerReceiver(receiver,new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
registerReceiver(receiver,new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
}
private XYMultipleSeriesDataset getTruitonBarDataset( List<ScanResult> classObject) {
int SERIES_NR ; //the number of columns to display,
ArrayList<String> legendTitles = new ArrayList<String>();
XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
Toast.makeText(getApplicationContext(),
"Position XYMultipleSeriesDataset:"+classObject , Toast.LENGTH_LONG)
.show();
Toast.makeText(getApplicationContext(),
"SIZE XYMultipleSeriesDataset:"+classObject.size() , Toast.LENGTH_LONG)
.show();
// length = classObject.size();
for (int j=0;j<classObject.size();j++){
values.add(new int[] { classObject.get(j).level}); //every serie will concern an access point and contain one RSSI
}
for (int k = 0; k < classObject.size(); k++) {
legendTitles.add(classObject.get(k).SSID);//every serie will have a legend the SSID
}
//determination des canaux
int[] channelsTab = new int[classObject.size()];
for(int i=0;i<classObject.size();i++){
if (classObject.get(i).frequency /1000 == 2) {
for (int j =0;j<14;j++)
{ if (Center_Frequency_2[1][j] == classObject.get(i).frequency)
channelsTab[i]= Center_Frequency_2[0][j] ;
}
}
}
//FIN determination des canaux
SERIES_NR = classObject.size() ;//number of access point
for (int i = 0; i < SERIES_NR; i++) {//Loop for every series
CategorySeries series = new CategorySeries(legendTitles.get(i));
int[] v = values.get(i);
int seriesLength = v.length;
dataset.addSeries(series.toXYSeries());
for (int k = 0; k < seriesLength; k++) {
Log.i("STOOP SERIES_NR",SERIES_NR+"");
Log.i("STOOP ii",i+"");
Log.i("STOOP",k+"");
Log.i("STOOP",v[k]+"");
Log.i("STOOP",v[k] / 10+"");
/* XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(i, 40 - v[k] %10);*/
switch (v[k] / 10){
case -9 :
//series.add(classObject[k]);
if (v[k] %10 == 0)
//series.add(40);
{XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(channelsTab[i], 30);
tempSerie.addAnnotation(legendTitles.get(i)+":"+v[k], channelsTab[i], 30);
}
else
//series.add(40 - v[k] %10);
{XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(channelsTab[i], 30 - v[k] %10);
tempSerie.addAnnotation(legendTitles.get(i)+":"+v[k] , channelsTab[i], 30 - v[k] %10);
}
break;
case -8 :
//series.add(classObject[k]);
if (v[k] %10 == 0)
//series.add(40);
{XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(channelsTab[i], 40);
tempSerie.addAnnotation(legendTitles.get(i)+":"+v[k], channelsTab[i], 40);
}
else
//series.add(40 - v[k] %10);
{XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(channelsTab[i], 40 - v[k] %10);
tempSerie.addAnnotation(legendTitles.get(i)+":"+v[k], channelsTab[i], 40 - v[k] %10);
}
break;
case -7 :
//series.add(classObject[k]);
if (v[k] %10 == 0)
{
XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(channelsTab[i], 50);
tempSerie.addAnnotation(legendTitles.get(i)+":"+v[k], channelsTab[i], 50);
}
else
//series.add(50 - v[k] %10);
{XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(channelsTab[i],50 - v[k] %10);
tempSerie.addAnnotation(legendTitles.get(i)+":"+v[k], channelsTab[i], 50 - v[k] %10);
// series.toXYSeries().add(7.5,50 - v[k] %10);
}
break;
case -6 :
//series.add(classObject[k]);
if (v[k] %10 == 0)
//series.add(60);
{XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(channelsTab[i], 60);
tempSerie.addAnnotation(legendTitles.get(i)+":"+v[k], channelsTab[i], 60);
}
else
//series.add(60 - v[k] %10);
{XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(channelsTab[i], 60 - v[k] %10);
tempSerie.addAnnotation(legendTitles.get(i)+":"+v[k], channelsTab[i], 60 - v[k] %10);
}
break;
case -5 :
//series.add(classObject[k]);
if (v[k] %10 == 0)
//series.add(70);
{XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(channelsTab[i], 70);
tempSerie.addAnnotation(legendTitles.get(i)+":"+v[k], channelsTab[i], 70);
}
else
//series.add(70 - v[k] %10);
{XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(channelsTab[i], 70 - v[k] %10);
tempSerie.addAnnotation(legendTitles.get(i)+":"+v[k], channelsTab[i], 70 - v[k] %10);
}
break;
case -4 :
//series.add(classObject[k]);
if (v[k] %10 == 0)
//series.add(80);
{XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(channelsTab[i], 80);
tempSerie.addAnnotation(legendTitles.get(i)+":"+v[k], channelsTab[i], 80);
}
else
{XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(channelsTab[i], 80 - v[k] %10);
tempSerie.addAnnotation(legendTitles.get(i)+":"+v[k], channelsTab[i], 80 - v[k] %10);
}
break;
case -3 :
//series.add(classObject[k]);
if (v[k] %10 == 0)
{XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(channelsTab[i], 90);
tempSerie.addAnnotation(legendTitles.get(i)+":"+v[k], channelsTab[i], 90);
}
else
//series.add(90 - v[k] %10);
{XYSeries tempSerie = dataset.getSeriesAt(i);
tempSerie.add(channelsTab[i], 90 - v[k] %10);
tempSerie.addAnnotation(legendTitles.get(i)+":"+v[k], channelsTab[i], 90 - v[k] %10);
}
break;
}
}
}
return dataset;
}
public XYMultipleSeriesRenderer getTruitonBarRenderer(int length) {
XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();
renderer.setAxisTitleTextSize(10);
renderer.setChartTitleTextSize(20);
renderer.setLabelsTextSize(10);
renderer.setLegendTextSize(10);
renderer.setMargins(new int[] { 30, 40, 15, 0 });
for (int k = 0; k < length; k++)
{ Log.i("SimpleSeriesRenderer" ,k+"");
SimpleSeriesRenderer r = new SimpleSeriesRenderer();
r.setColor(Color.rgb((int)(Math.random() * 255), (int)(Math.random() * 255), (int)Math.random() * 255));
renderer.addSeriesRenderer(r);
}
return renderer;
}
@SuppressWarnings("deprecation")
private void myChartSettings(XYMultipleSeriesRenderer renderer) {
renderer.setChartTitle("Wifi Channels");
renderer.setXAxisMin(-1);
renderer.setXAxisMax(16);
renderer.setYAxisMin(20);
renderer.setYAxisMax(100);
renderer.addXTextLabel(1, "1");
renderer.addXTextLabel(2, "2");
renderer.addXTextLabel(3, "3");
renderer.addXTextLabel(4, "4");
renderer.addXTextLabel(5, "5");
renderer.addXTextLabel(6, "6");
renderer.addXTextLabel(7, "7");
renderer.addXTextLabel(8, "8");
renderer.addXTextLabel(9, "9");
renderer.addXTextLabel(10, "10");
renderer.addXTextLabel(11, "11");
renderer.addXTextLabel(12, "12");
renderer.addXTextLabel(13, "13");
renderer.addXTextLabel(14, "14");
renderer.addYTextLabel(0, "");
renderer.addYTextLabel(20, "-100");
renderer.addYTextLabel(30, "-90");
renderer.addYTextLabel(40, "-80");
renderer.addYTextLabel(50, "-70");
renderer.addYTextLabel(60, "-60");
renderer.addYTextLabel(70, "-50");
renderer.addYTextLabel(80, "-40");
renderer.addYTextLabel(90, "-30");
renderer.addYTextLabel(100, "");
renderer.setPanEnabled(true, true);
renderer.setZoomEnabled(true, true);
renderer.setApplyBackgroundColor(true);
renderer.setBackgroundColor(Color.BLACK);
renderer.setYLabelsAlign(Align.RIGHT);
renderer.setBarSpacing(0.5);
renderer.setXTitle("Canal du WiFi");
renderer.setYTitle("Puissance du signal[dbm]");
renderer.setShowGrid(true);
renderer.setGridColor(Color.GRAY);
renderer.setXLabels(0); // sets the number of integer labels to appear
renderer.setXLabels((int) 0.5);//25
renderer.setYLabels(10);
renderer.setBarWidth(10);// bar width
renderer.setXLabelsAlign(Align.LEFT);
}
}
回答1:
Well i resolved this problem ,to have a eal time chart (bar chart ) ,i have to change tho my onReceive method like bellow.I hope it will help someone.
public void onReceive(Context context, Intent intent) {
WifiManager wifiMan=(WifiManager)WifiChartsRealTime.this.getSystemService(Context.WIFI_SERVICE);
wifiMan.startScan();
if(intent.getAction().equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)){
results = wifi.getScanResults();
length=results.size();
Log.i("length1",length +"");
XYMultipleSeriesRenderer renderer = getTruitonBarRenderer(results.size());
myChartSettings(renderer);
layout = (LinearLayout) findViewById(R.id.chart);
if (mChartView != null) {
layout.removeView(mChartView);
}
mChartView = ChartFactory.getBarChartView(WifiChartsRealTime.this, getTruitonBarDataset( results), renderer, Type.STACKED);
layout.addView(mChartView, 0, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
}
}`
来源：https://stackoverflow.com/questions/23056144/android-broadcastreceiver-with-achartengine-dont-display-updates