Android Open Source - sensor-supervisor G P S Fragment

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From Project

Back to project page sensor-supervisor.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.thirdi.sensorsupervisor;
/*from   www. j a v a2s. c om*/
import android.app.Fragment;
import android.content.Context;
import android.content.Intent;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.provider.Settings;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class GPSFragment extends Fragment implements LocationListener {
  /**
   * Shows GPS data. And let's you control it.
   * 
   * mLatitudeView, mLongitudeView, mAccuracyView : Shows location data as
   * text. mLocationManager : Location manager to retrieve location. mProvider
   * : String that holds the current provider. mLocationButton : Button that
   * registers GPS.
   */
  private TextView mLatitudeView, mLongitudeView, mAccuracyView;
  private LocationManager mLocationManager;
  private String mProvider;
  private Button mLocationButton, mLocationStopButton;
  private Button mMaps;

  public GPSFragment() {
    // Required empty public constructor.
  }

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {
    // Inflate the layout for this fragment.
    return inflater.inflate(R.layout.fragment_gps, container, false);

  }

  @Override
  public void onStart() {
    super.onStart();
    // Initialize member variables.
    mLatitudeView = (TextView) getView().findViewById(R.id.latitude);
    mLongitudeView = (TextView) getView().findViewById(R.id.longitude);
    mAccuracyView = (TextView) getView().findViewById(R.id.accuracy);
    mLocationButton = (Button) getView().findViewById(R.id.locationButton);
    mMaps = (Button) getView().findViewById(R.id.btnMap);
    mLocationManager = (LocationManager) getActivity().getBaseContext()
        .getSystemService(Context.LOCATION_SERVICE);
    mLocationStopButton = (Button) getView().findViewById(R.id.locationStopButton);
    
    mLocationStopButton.setClickable(false);
    
    // Set a click listener to our location button.
    mMaps.setOnClickListener(new View.OnClickListener() {

      @Override
      public void onClick(View v) {
        Intent myIntent = new Intent(getView().getContext(), maps.class);
        startActivity(myIntent);

      }
    });

    mLocationButton.setOnClickListener(new View.OnClickListener() {

      @Override
      public void onClick(View v) {
        // This method is being invoked whenever you click the button.
        registerGPS();
        mLocationStopButton.setClickable(true);
        mLocationButton.setClickable(false);
      }
    });
    
    mLocationStopButton.setOnClickListener(new View.OnClickListener() {
      
      @Override
      public void onClick(View v) {
        //Removes status listener.
        mLocationManager.removeUpdates(GPSFragment.this);
        mLocationStopButton.setClickable(false);
        mLocationButton.setClickable(true);
      }
    });
  }

  private boolean registerGPS() {
    // Registers GPS if there is a viable GPS provider. Otherwise shows no
    // data.
    // True for success, false for failure.
    Location location;

    if (mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
      // Provider is present, continue registering. Use default criteria
      // to select provider.
      mProvider = LocationManager.GPS_PROVIDER;
      
      //Never-ending location updates, yay.
      mLocationManager.requestLocationUpdates(mProvider, 0, 0, this);
      
      // Get last known location from said provider.
      location = mLocationManager.getLastKnownLocation(mProvider);

      // If we have a location data
      if (location != null) {
        Toast.makeText(getActivity().getBaseContext(), "Provider "
            + mProvider + " has been selected.", Toast.LENGTH_SHORT);
        onLocationChanged(location);
        return true;
      } else {
        mLatitudeView.setText("No data.");
        mLongitudeView.setText("No data.");
        mAccuracyView.setText("No data.");
      }
    } else {
      Toast.makeText(getActivity().getBaseContext(),
          "Please enable location services.", Toast.LENGTH_SHORT);
      if (!openLocationSettings()) {
        Toast.makeText(getActivity().getBaseContext(),
            "Oh snap! Can't open location settings.",
            Toast.LENGTH_SHORT);
      }
    }

    return false;
  }

  private boolean openLocationSettings() {
    // Checks whether a settings program for location settings is present,
    // if there is attempts to open it.
    final Intent intent = new Intent(
        Settings.ACTION_LOCATION_SOURCE_SETTINGS);

    if (intent.resolveActivity(getActivity().getPackageManager()) != null) {
      startActivity(intent);
      return true;
    }
    return false;
  }

  @Override
  public void onLocationChanged(Location location) {
    // This method is being invoked whenever your location changes.

    // Show new location.
    double latitude, longitude, accuracy;
    latitude = location.getLatitude();
    longitude = location.getLongitude();
    accuracy = location.getAccuracy();

    mLatitudeView.setText(String.valueOf(latitude));
    mLongitudeView.setText(String.valueOf(longitude));
    mAccuracyView.setTag(String.valueOf(accuracy));
  }

  @Override
  public void onProviderDisabled(String provider) {
    // This method is being invoked whenever your provider becomes disabled.

    Toast.makeText(getActivity().getBaseContext(), "Disabled provider: "
        + provider, Toast.LENGTH_SHORT);

  }

  @Override
  public void onProviderEnabled(String provider) {
    // This method is being invoked whenever your provider becomes enabled.

    Toast.makeText(getActivity().getBaseContext(), "Enabled new provider: "
        + provider, Toast.LENGTH_SHORT);

  }

  @Override
  public void onStatusChanged(String provider, int status, Bundle extras) {
    // This method is being invoked whenever the provider status changes.
  }
}

Java Source Code List

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