LayersDemoActivity.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.mapdemo;

import static com.google.android.gms.maps.GoogleMap.MAP_TYPE_HYBRID;
import static com.google.android.gms.maps.GoogleMap.MAP_TYPE_NORMAL;
import static com.google.android.gms.maps.GoogleMap.MAP_TYPE_SATELLITE;
import static com.google.android.gms.maps.GoogleMap.MAP_TYPE_TERRAIN;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.Spinner;
import android.widget.Toast;

/**
 * Demonstrates the different base layers of a map.
 */
public class LayersDemoActivity extends FragmentActivity implements OnItemSelectedListener {

    private GoogleMap mMap;

    private CheckBox mTrafficCheckbox;
    private CheckBox mMyLocationCheckbox;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layers_demo);

        Spinner spinner = (Spinner) findViewById(R.id.layers_spinner);
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
                this, R.array.layers_array, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(this);

        mTrafficCheckbox = (CheckBox) findViewById(R.id.traffic);
        mMyLocationCheckbox = (CheckBox) findViewById(R.id.my_location);

        setUpMapIfNeeded();
    }

    @Override
    protected void onResume() {
        super.onResume();
        setUpMapIfNeeded();
        if (mMap != null) {
            updateTraffic();
            updateMyLocation();
        }
    }

    private void setUpMapIfNeeded() {
        if (mMap == null) {
            mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
                    .getMap();
        }
    }

    private boolean checkReady() {
        if (mMap == null) {
            Toast.makeText(this, R.string.map_not_ready, Toast.LENGTH_SHORT).show();
            return false;
        }
        return true;
    }

    /**
     * Called when the Traffic checkbox is clicked.
     */
    public void onTrafficToggled(View view) {
        updateTraffic();
    }

    private void updateTraffic() {
        if (!checkReady()) {
            return;
        }
        mMap.setTrafficEnabled(mTrafficCheckbox.isChecked());
    }

    /**
     * Called when the MyLocation checkbox is clicked.
     */
    public void onMyLocationToggled(View view) {
        updateMyLocation();
    }

    private void updateMyLocation() {
        if (!checkReady()) {
            return;
        }
        mMap.setMyLocationEnabled(mMyLocationCheckbox.isChecked());
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

        setLayer((String) parent.getItemAtPosition(position));
    }

    private void setLayer(String layerName) {
        if (!checkReady()) {
            return;
        }
        if (layerName.equals(getString(R.string.normal))) {
            mMap.setMapType(MAP_TYPE_NORMAL);
        } else if (layerName.equals(getString(R.string.hybrid))) {
            mMap.setMapType(MAP_TYPE_HYBRID);
        } else if (layerName.equals(getString(R.string.satellite))) {
            mMap.setMapType(MAP_TYPE_SATELLITE);
        } else if (layerName.equals(getString(R.string.terrain))) {
            mMap.setMapType(MAP_TYPE_TERRAIN);
        } else {
            Log.i("LDA", "Error setting layer with name " + layerName);
        }
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
        // Do nothing.
    }
}