Google I/O 2013 で発表された Fused Location Provider を使ってみる

//AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.fusedlocationprovidersample"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.fusedlocationprovidersample.MainActivity"
            android:screenOrientation="portrait"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

//MainActivity.java
package com.example.fusedlocationprovidersample;

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.location.LocationClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import android.location.Location;
import android.os.Bundle;
import android.text.format.DateFormat;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.app.Activity;

public class MainActivity extends Activity {
	
	// FusedLocationProvider 用の Client
	private LocationClient _locationClient;
	private TextView _textResult;
	
	// 以前と変わらない LocationListener
    private final LocationListener _locationListener = new LocationListener() {
		
		@Override
		public void onLocationChanged(final Location location) {
			MainActivity.this.runOnUiThread(new Runnable() {
				@Override
				public void run() {
					String text = _textResult.getText().toString();
		            text = DateFormat.format("hh:mm:ss.sss", location.getTime()) + " - " 
		                    + location.getLatitude() + "/" +
		                    + location.getLongitude() + "/" +
		                    + location.getAccuracy() + 
		                    "\n" + text;

		            _textResult.setText(text);
				}
			});
		}
	};
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		_textResult = (TextView)findViewById(R.id.text_result);
		
		final Button buttonLocate = (Button)findViewById(R.id.button_locate);
		buttonLocate.setOnClickListener(new OnClickListener() {
			private boolean _isStarted = false;
			
			@Override
			public void onClick(View v) {
				if (!_isStarted) {
					startLocate();
					buttonLocate.setText("Stop");
				} else {
					stopLocate();
					buttonLocate.setText("Start");
				}
				
				_isStarted = !_isStarted;
			}
		});
	}
	
	@Override
	protected void onDestroy() {
		stopLocate();
		super.onDestroy();
	}
	
	private void startLocate() {
		_locationClient = new LocationClient(this, new ConnectionCallbacks() {

			@Override
            public void onConnected(Bundle bundle) {
				// 2. 位置の取得開始！
				LocationRequest request = LocationRequest.create()
				.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
				.setInterval(5000); // 5秒おき
            	_locationClient.requestLocationUpdates(request, _locationListener);
            }

            @Override
            public void onDisconnected() {
            	_locationClient = null;
            }

        }, new OnConnectionFailedListener() {
            @Override
            public void onConnectionFailed(ConnectionResult result) {
            }
        });
		
		// 1. 位置取得サービスに接続！
		_locationClient.connect();
	}

	private void stopLocate() {
		if (_locationClient == null || !_locationClient.isConnected()) {
			return;
		}
		
		_locationClient.removeLocationUpdates(_locationListener);
		_locationClient.disconnect();
		// ConnectionCallbacks.onDisconnected が呼ばれるまで待った方がいい気がする
	}
}