MainActivity.java

package com.ptrprograms.streetview.activities;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient;
import com.google.android.gms.location.LocationClient;
import com.google.android.gms.maps.StreetViewPanorama;
import com.google.android.gms.maps.StreetViewPanoramaFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.StreetViewPanoramaCamera;
import com.ptrprograms.streetview.R;


public class MainActivity extends Activity implements GooglePlayServicesClient.ConnectionCallbacks,
		GooglePlayServicesClient.OnConnectionFailedListener {

	private static final String EXTRA_LONG = "current_long";
	private static final String EXTRA_LAT = "current_lat";
	private static final String EXTRA_BEARING = "current_bearing";
	private static final String EXTRA_TILT = "current_tilt";
	private static final String EXTRA_ZOOM = "current_zoom";

	private LocationClient mLocationClient;
	private LatLng mCurrentLocation;
	private float mBearing;
	private float mTilt;
	private float mZoom;

	private StreetViewPanorama mPanorama;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
		if( savedInstanceState != null ) {
			if( savedInstanceState.containsKey( EXTRA_LAT ) && savedInstanceState.containsKey( EXTRA_LONG ) ) {
				mCurrentLocation = new LatLng( savedInstanceState.getDouble( EXTRA_LAT ), savedInstanceState.getDouble( EXTRA_LONG ) );
				if( savedInstanceState.containsKey( EXTRA_TILT ) && savedInstanceState.containsKey( EXTRA_BEARING ) ) {
					mTilt = savedInstanceState.getFloat( EXTRA_TILT );
					mBearing = savedInstanceState.getFloat( EXTRA_BEARING );
					mZoom = savedInstanceState.getFloat( EXTRA_ZOOM );
				}
			}
		}
    }

	private void initStreetView( ) {
		StreetViewPanoramaFragment fragment = ( (StreetViewPanoramaFragment) getFragmentManager().findFragmentById( R.id.street_view_panorama_fragment ) );
		if( mPanorama == null ) {
			if( fragment != null ) {
				mPanorama = fragment.getStreetViewPanorama();
				if( mPanorama != null && mCurrentLocation != null ) {
					StreetViewPanoramaCamera.Builder builder = new StreetViewPanoramaCamera.Builder( mPanorama.getPanoramaCamera() );
					if( mBearing != builder.bearing )
						builder.bearing = mBearing;
					if( mTilt != builder.tilt )
						builder.tilt = mTilt;
					if( mZoom != builder.zoom )
						builder.zoom = mZoom;
					mPanorama.animateTo(builder.build(), 0);
					mPanorama.setPosition( mCurrentLocation, 300 );
					mPanorama.setStreetNamesEnabled( true );
				}
			}
		}
	}

	@Override
	protected void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		if( mPanorama != null && mPanorama.getLocation() != null && mPanorama.getLocation().position != null ) {
			outState.putDouble( EXTRA_LAT, mPanorama.getLocation().position.latitude );
			outState.putDouble( EXTRA_LONG, mPanorama.getLocation().position.longitude );
		}
		if( mPanorama != null && mPanorama.getPanoramaCamera() != null ) {
			outState.putFloat( EXTRA_TILT, mPanorama.getPanoramaCamera().tilt );
			outState.putFloat( EXTRA_BEARING, mPanorama.getPanoramaCamera().bearing );
			outState.putFloat( EXTRA_ZOOM, mPanorama.getPanoramaCamera().zoom );
		}
	}

	private void updateStreetViewPosition() {
		if( mLocationClient == null )
			mLocationClient = new LocationClient( this, this, this );
		if( !mLocationClient.isConnected() && !mLocationClient.isConnecting() ) {
			mLocationClient.connect();
		}
	}

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

	@Override
	public void onConnected(Bundle bundle) {
		if( mCurrentLocation == null ) {
			mCurrentLocation = new LatLng( mLocationClient.getLastLocation().getLatitude(), mLocationClient.getLastLocation().getLongitude() );
		}
		initStreetView();
	}

	@Override
	public void onDisconnected() {

	}

	@Override
	public void onConnectionFailed(ConnectionResult connectionResult) {
	}

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