我正在尝试使用 aChartEngine 将 GPS 数据（视图中或使用中的卫星）显示为条形图，但我没有在此视图中显示任何数据。这是我的代码，你能说出我犯了什么错误吗？
public class SmartHikingActivity extends Activity implements LocationListener{
LocationManager Lm;
LocationProvider Lp;
static List<String> PL;
GpsSatellite Sat;
static Iterable<GpsSatellite> Sats;
static ArrayList<SatelliteData> LSats;
TextView txtTime;
TextView txtDate;
TextView txtLat;
TextView txtLon;
TextView txtAccuracy;
TextView txtAltitude;
TextView txtSpeed;
TextView txtBearing;
TextView txtGpsPower;
TextView txtInView;
TextView txtInUse;
Calculations C;
LinearLayout layout;
static XYMultipleSeriesDataset dataset;
static XYMultipleSeriesRenderer renderer;
static XYSeriesRenderer rendererSeries;
static CategorySeries series;
static GraphicalView mChartView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.lyt_gps);
layout = (LinearLayout) findViewById(R.id.chart);
txtTime=(TextView)findViewById(R.id.txtTime);
txtDate=(TextView)findViewById(R.id.txtDate);
txtLat=(TextView)findViewById(R.id.txtLat);
txtLon=(TextView)findViewById(R.id.txtLon);
txtAccuracy=(TextView)findViewById(R.id.txtAccuracy);
txtAltitude=(TextView)findViewById(R.id.txtAltitude);
txtSpeed=(TextView)findViewById(R.id.txtSpeed);
txtBearing=(TextView)findViewById(R.id.txtBearing);
txtGpsPower=(TextView)findViewById(R.id.txtGpsPower);
txtInUse=(TextView)findViewById(R.id.txtInUse);
txtInView=(TextView)findViewById(R.id.txtInView);
C=new Calculations();
Lm=(LocationManager) getSystemService(Context.LOCATION_SERVICE);
PL=Lm.getAllProviders();
LSats = new ArrayList<SatelliteData>();
Lm.addGpsStatusListener(gpsListener);
if(Lm.isProviderEnabled(LocationManager.GPS_PROVIDER)){
Lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000 * 30, 500.0f, this);
}
dataset = new XYMultipleSeriesDataset();
renderer = new XYMultipleSeriesRenderer();
renderer.setChartTitle("Satellites Status");
renderer.setXTitle("SATS");
renderer.setYTitle("SNR");
renderer.setXAxisMin(0);
renderer.setXAxisMax(24);
renderer.setYAxisMin(0);
renderer.setYAxisMax(120);
renderer.setClickEnabled(false);
renderer.setExternalZoomEnabled(false);
renderer.setPanEnabled(false, false);
renderer.setZoomEnabled(false, false);
renderer.setBarSpacing(0.5);
renderer.setAxisTitleTextSize(16);
renderer.setChartTitleTextSize(20);
renderer.setLabelsTextSize(15);
renderer.setLegendTextSize(15);
renderer.setMargins(new int[] {20, 30, 15, 0});
rendererSeries = new XYSeriesRenderer();
rendererSeries.setColor(Color.GRAY);
rendererSeries.setDisplayChartValues(true);
renderer.addSeriesRenderer(rendererSeries);
//renderer = getBarDemoRenderer();
//Intent intent = ChartFactory.getBarChartIntent(this, getBarDemoDataset(), renderer, Type.DEFAULT);
//startActivity(intent);
//mChartView = ChartFactory.getBarChartView(this, dataset, renderer, Type.DEFAULT);
//layout.addView(mChartView);
}
@Override
public void onPause(){
super.onPause();
Lm.removeUpdates(this);
}
@Override
public void onResume(){
super.onResume();
Lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000 * 30, 500.0f, this);
}
public void onLocationChanged(Location loc) {
txtLat.setText(C.convertToDMS(loc.getLatitude(),"Lat"));
txtLon.setText(C.convertToDMS(loc.getLongitude(),"Lon"));
txtAccuracy.setText(String.valueOf(loc.getAccuracy()));
txtAltitude.setText(String.valueOf(loc.getAltitude()));
txtSpeed.setText(String.valueOf(loc.getSpeed()));
txtBearing.setText(String.valueOf(loc.getBearing()));
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
private GpsStatus.Listener gpsListener = new GpsStatus.Listener() {
public void onGpsStatusChanged(int event) {
GpsStatus gpsStatus = Lm.getGpsStatus(null);
switch (event) {
case GpsStatus.GPS_EVENT_STARTED:
//tvDemo.setText( "onGpsStatusChanged(): GPS started");
break;
case GpsStatus.GPS_EVENT_FIRST_FIX:
//tvDemo.setText("onGpsStatusChanged(): time to first fix in ms = " + gpsStatus.getTimeToFirstFix());
break;
case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
Iterable<GpsSatellite>satellites = gpsStatus.getSatellites();
Iterator<GpsSatellite>satI = satellites.iterator();
while (satI.hasNext()) {
GpsSatellite sat = satI.next();
SatelliteData SD = new SatelliteData();
SD.setPRN(sat.getPrn());
SD.setSNR(sat.getSnr());
SD.setUIF(sat.usedInFix());
if(!SatExist(LSats,sat.getPrn())){
LSats.add(SD);
}else{
UpdateSat(LSats,sat.getPrn(),SD);
}
}
String line="";
int Total=0;
int inUse=0;
try{
for(int i=0;i<LSats.size();i++){
line= line + "PRN: " + LSats.get(i).getPRN() + " SNR: " + LSats.get(i).getSNR() + " UIF: " + LSats.get(i).isUIF() + "\n";
Total=Total+1;
if(LSats.get(i).isUIF()) inUse=inUse+1;
}
}catch(NullPointerException Npe){
}
txtInView.setText(String.valueOf(Total));
txtInUse.setText(String.valueOf(inUse));
Log.v("", "Triggering refresh chart");/////////////////////////
series = new CategorySeries("Satellites");
try{
Log.v("", "Filling Dataset");
for (int k = 0; k < LSats.size(); k++) {
series.add(LSats.get(k).getSNR());
}
}catch(Exception e){
Log.v("", "Error Filling Dataset");
}
///////////////////////////////////////////
dataset.addSeries(series.toXYSeries());
if (mChartView==null){
mChartView = ChartFactory.getBarChartView(SmartHikingActivity.this, dataset, renderer, Type.DEFAULT);
layout.addView(mChartView);
mChartView.refreshDrawableState();
mChartView.repaint();
}
break;
case GpsStatus.GPS_EVENT_STOPPED:
break;
}
}
};
private boolean SatExist(List<SatelliteData> lSD, int PRN){
boolean Exist=false;
try{
for(int i=0; i < lSD.size();i++){
if (lSD.get(i).getPRN()==PRN){
Exist= true;
break;
}
}
}catch(NullPointerException Npe){
Exist=false;
}
return Exist;
}
private void UpdateSat(List<SatelliteData> lSD, int PRN, SatelliteData sD){
for(int i=0; i < lSD.size();i++){
if (lSD.get(i).getPRN()==PRN){
lSD.get(i).setSNR(sD.getSNR());
lSD.get(i).setUIF(sD.isUIF());
break;
}
}
}
}
图表必须在 onGpsStatusChanged 事件中更新。
非常感谢