你好朋友我是android开发的新手。
我试图使用以下代码查找地址...在模拟器中它没有在日志猫中显示任何消息。但是当我在我的设备中使用这个应用程序时，它每次都会停止......如果有人能建议我如何从设备读取 log cat massege 以及如何使用此代码获取地址......如果代码中有任何错误。 .请建议我如何解决它。
gps 类的代码....
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
public static final Double val = 10.0;
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
//getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
//isGPSEnabled = locationManager
//.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled || !isNetworkEnabled) {
// no network provider is enabled
//Toast.makeText(getApplicationContext(), "no gps or network found", Toast.LENGTH_SHORT).show();
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
if (location == null) {
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
// 高精度
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
String provider = locationManager.getBestProvider(criteria, true);
locationManager.requestLocationUpdates(
provider,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
// if GPS Enabled get lat/long using GPS Services
/*if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}*/
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
/**
* Function to check GPS/wifi enabled
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
@Override
public void onLocationChanged(Location location) {
//makeUseOfNewLocation(location);
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
}
mainActivity 的代码
public class Act1 extends Activity{
TextView loc;
GPSTracker gps;
Location location;
String mAddress="";
Criteria criteria;
String providername="";
String device_id="";
String ph="";
double lat,lon;
int lac=0,cid=0;
String address2="";
String MyAddress="";
protected LocationManager locationManager;
public void onCreate(Bundle b){
super.onCreate(b);
setContentView(R.layout.main);
loc=(TextView)findViewById(R.id.loc);
gps=new GPSTracker(getApplicationContext());
location=gps.getLocation();
if (gps.latitude != 0 || gps.longitude != 0){
Act1.getFromLocation(gps.getLatitude(), gps.getLongitude(), 10);
for(int i=0;i<Act1.getFromLocation(gps.getLatitude(), gps.getLongitude(), 10).size();i++){
MyAddress+=Act1.getFromLocation(gps.getLatitude(), gps.getLongitude(), 10).get(i).toString();
}
}
loc.setText(MyAddress);
}
public static List<Address> getFromLocation(double lat, double lng, int maxResult){
String address = String.format(Locale.ENGLISH,"http://maps.googleapis.com/maps/api/geocode/json?latlng=%1$f,%2$f&sensor=true&language="+Locale.getDefault().getCountry(), lat, lng);
HttpGet httpGet = new HttpGet(address);
HttpClient client = new DefaultHttpClient();
HttpResponse response;
StringBuilder stringBuilder = new StringBuilder();
List<Address> retList = null;
try {
response = client.execute(httpGet);
HttpEntity entity = response.getEntity();
InputStream stream = entity.getContent();
int b;
while ((b = stream.read()) != -1) {
stringBuilder.append((char) b);
}
JSONObject jsonObject = new JSONObject();
jsonObject = new JSONObject(stringBuilder.toString());
retList = new ArrayList<Address>();
if("OK".equalsIgnoreCase(jsonObject.getString("status"))){
JSONArray results = jsonObject.getJSONArray("results");
for (int i=0;i<results.length();i++ ) {
JSONObject result = results.getJSONObject(i);
String indiStr = result.getString("formatted_address");
Address addr = new Address(Locale.getDefault());
addr.setAddressLine(0, indiStr);
retList.add(addr);
}
}
} catch (ClientProtocolException e) {
Log.e(Act1.class.getName(), "Error calling Google geocode webservice.", e);
} catch (IOException e) {
Log.e(Act1.class.getName(), "Error calling Google geocode webservice.", e);
} catch (JSONException e) {
Log.e(Act1.class.getName(), "Error parsing Google geocode webservice response.", e);
}
return retList;
}
}
