Android Open Source - Common-Alerting-Protocol-Compliant-Emergency-Warning-App-For-Android-Using-AMQP Affected Area Map Activity Online

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License

The source code is released under:

This is free and unencumbered software released into the public domain. Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a co...

Java Source Code

package in.ac.iitd.cse.iuatc.ews;
/*  w  ww  . j  av a 2s. c  o m*/
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnCameraChangeListener;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.CircleOptions;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.LatLngBounds;
import com.google.maps.android.SphericalUtil;

public class AffectedAreaMapActivityOnline extends FragmentActivity {

  private GoogleMap mMap;
  LatLng center;
  double radius;

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

    double lat = (Double) getIntent().getSerializableExtra("LAT");
    double lng = (Double) getIntent().getSerializableExtra("LNG");
    this.center = new LatLng(lat, lng);

    this.radius = (Double) getIntent().getSerializableExtra("RADIUS");

    setContentView(R.layout.activity_affected_area_map);
    setUpMapIfNeeded();
  }

  @Override
  protected void onResume() {
    super.onResume();
    setUpMapIfNeeded();
  }

  private void setUpMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the
    // map.
    if (this.mMap == null) {
      // Try to obtain the map from the SupportMapFragment.
      this.mMap = ((SupportMapFragment) getSupportFragmentManager()
          .findFragmentById(R.id.map)).getMap();
      // Check if we were successful in obtaining the map.
      if (this.mMap != null) {
        setUpMap();
      }
    }
  }

  private void setUpMap() {
    this.mMap.addCircle(new CircleOptions().center(this.center)
        .radius(this.radius).strokeColor(Color.argb(128, 0, 0, 255))
        .strokeWidth(3).fillColor(Color.argb(64, 0, 0, 255)));

    this.mMap.setOnCameraChangeListener(new OnCameraChangeListener() {
      @Override
      public void onCameraChange(CameraPosition arg0) {
        LatLngBounds.Builder builder = LatLngBounds.builder();
        LatLngBounds bounds = builder
            .include(
                SphericalUtil
                    .computeOffset(
                        AffectedAreaMapActivityOnline.this.center,
                        AffectedAreaMapActivityOnline.this.radius,
                        0))
            .include(
                SphericalUtil
                    .computeOffset(
                        AffectedAreaMapActivityOnline.this.center,
                        AffectedAreaMapActivityOnline.this.radius,
                        90))
            .include(
                SphericalUtil
                    .computeOffset(
                        AffectedAreaMapActivityOnline.this.center,
                        AffectedAreaMapActivityOnline.this.radius,
                        180))
            .include(
                SphericalUtil
                    .computeOffset(
                        AffectedAreaMapActivityOnline.this.center,
                        AffectedAreaMapActivityOnline.this.radius,
                        270)).build();
        // Move camera.
        AffectedAreaMapActivityOnline.this.mMap
            .moveCamera(CameraUpdateFactory.newLatLngBounds(bounds,
                0));
        // Remove listener to prevent position reset on camera move.
        AffectedAreaMapActivityOnline.this.mMap
            .setOnCameraChangeListener(null);
      }
    });
  }

}

Java Source Code List

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