MainActivity.java

package com.techbooster.location;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient.ConnectionCallbacks;
import com.google.android.gms.common.GooglePlayServicesClient.OnConnectionFailedListener;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.location.LocationClient;

import android.content.Intent;
import android.location.Location;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity implements ConnectionCallbacks, OnConnectionFailedListener {

    private LocationClient mLocationClient;
    private Location mLoc;
    private TextView[] mLocation = new TextView[3];
    private Button mMapBtn;

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

        // Google Play ServiceKが実装されているか確認
        final int result = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
        if (result != ConnectionResult.SUCCESS) {
            Toast.makeText(this, "Google Play service is not available (status=" + result + ")", Toast.LENGTH_LONG).show();
            finish();
        }

        mLocationClient = new LocationClient(this, this, this);
        mLocation[0] = (TextView) findViewById(R.id.lat_text);
        mLocation[1] = (TextView) findViewById(R.id.lon_text);
        mMapBtn = (Button) findViewById(R.id.map);

        mMapBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // IntentでGoogle Mapを呼び出す
                Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("geo:" + mLoc.getLatitude() + "," + mLoc.getLongitude()));
                startActivity(intent);
            }
        });
    }

    @Override
    protected void onResume() {
        super.onResume();
        // Google Play Servicesへの接続
        mLocationClient.connect();
    }

    @Override
    protected void onPause() {
        super.onPause();
        // Google Play Servicesとの切断
        if (mLocationClient != null) {
            mLocationClient.disconnect();
        }
    }

    @Override
    public void onConnectionFailed(ConnectionResult result) {
        // Google Play Servicesへの接続に失敗した
        Toast.makeText(this, "onConnectionFailed", Toast.LENGTH_LONG).show();
        Log.d("ERROR", result.toString());
    }

    @Override
    public void onConnected(Bundle connectionHint) {
        Toast.makeText(this, "Connected", Toast.LENGTH_LONG).show();

        // 位置情報の取得
        mLoc = mLocationClient.getLastLocation();
        Log.d("LOCATION", "LAT: " + mLoc.getLatitude());
        Log.d("LOCATION", "LON: " + mLoc.getLongitude());

        mLocation[0].setText(String.valueOf(mLoc.getLatitude()));
        mLocation[1].setText(String.valueOf(mLoc.getLongitude()));
    }

    @Override
    public void onDisconnected() {
        Toast.makeText(this, "Disconnected", Toast.LENGTH_LONG).show();
    }
}