ロケーションモードをデフォルトモードから「高精度/バッテリー節約」に変更する方法（デバイスのみ）
このチュートリアルを使用して現在地を取得するためのグーグルマップを実装しようとしています
問題は、デバイスのグーグルマップを開始してグーグル位置情報サービスにアクセスする許可を与えるまで、現在の場所を取得できないことです。この後、私のアプリケーションは私の現在の場所も取得します。そして、デバイス内の場所がオンになるまでは正常に機能しています。また、位置情報がオフになっている場合は、デバイスのGoogleマップを開始し、Google位置情報サービスの許可を与える必要があります。
私はすでに指示に従ってキーを生成しました。
デバイスロケーションモードで問題が見つかりました。デバイスモードを高精度/バッテリー節約に手動で変更すると、正常に動作します。
プログラムでロケーションモードをデフォルトモード（デバイスのみ）から「高精度/バッテリー節約」に変更する方法
アクティビティコードは次のとおりです。
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
private GoogleMap mMap;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker;
LocationRequest mLocationRequest;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
checkLocationPermission();
}
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
//Initialize Google Play Services
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
}
else {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onLocationChanged(Location location) {
mLastLocation = location;
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
//Place current location marker
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("Current Position");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_Magenta));
mCurrLocationMarker = mMap.addMarker(markerOptions);
//move map camera
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
//stop location updates
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
public boolean checkLocationPermission(){
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Asking user if explanation is needed
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
}
return false;
} else {
return true;
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted. Do the
// contacts-related task you need to do.
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
if (mGoogleApiClient == null) {
buildGoogleApiClient();
}
mMap.setMyLocationEnabled(true);
}
} else {
// Permission denied, Disable the functionality that depends on this permission.
Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
}
return;
}
// other 'case' lines to check for other permissions this app might request.
// You can add here other case statements according to your requirement.
}
}
}
マニフェストファイルのコードは次のとおりです。
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:Android="http://schemas.Android.com/apk/res/Android"
package="com.example.googlemap">
<uses-permission Android:name="Android.permission.INTERNET" />
<uses-permission Android:name="Android.permission.ACCESS_NETWORK_STATE" />
<uses-permission Android:name="Android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission Android:name="com.google.Android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission Android:name="Android.permission.ACCESS_FINE_LOCATION" />
<permission
Android:name="com.example.envent_pc03.googlemap.permission.MAPS_RECEIVE"
Android:protectionLevel="signature" />
<uses-permission Android:name="com.example.googlemap.permission.MAPS_RECEIVE"/>
<uses-feature Android:name="Android.hardware.location.gps" />
<uses-feature
Android:glEsVersion="0x00020000"
Android:required="true"/>
<!--
The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
Google Maps Android API v2, but you must specify either coarse or fine
location permissions for the 'MyLocation' functionality.
-->
<!--<uses-permission Android:name="Android.permission.ACCESS_FINE_LOCATION" />-->
<!--<uses-permission Android:name="Android.permission.ACCESS_NETWORK_STATE" />-->
<!--<uses-permission Android:name="Android.permission.INTERNET" />-->
<!--<uses-permission Android:name="com.google.Android.providers.gsf.permission.READ_GSERVICES" />-->
<!--
The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
Google Maps Android API v2, but you must specify either coarse or fine
location permissions for the 'MyLocation' functionality.
-->
<!--<uses-permission Android:name="Android.permission.ACCESS_COARSE_LOCATION"/>-->
<!--<uses-permission Android:name="Android.permission.ACCESS_FINE_LOCATION" />-->
<application
Android:allowBackup="true"
Android:icon="@mipmap/ic_launcher"
Android:label="@string/app_name"
Android:supportsRtl="true"
Android:theme="@style/AppTheme">
<!--
The API key for Google Maps-based APIs is defined as a string resource.
(See the file "res/values/google_maps_api.xml").
Note that the API key is linked to the encryption key used to sign the APK.
You need a different API key for each encryption key, including the release key that is used to
sign the APK for publishing.
You can define the keys for the debug and release targets in src/debug/ and src/release/.
-->
<meta-data
Android:name="com.google.Android.geo.API_KEY"
Android:value="@string/google_maps_key" />
<activity
Android:name=".MapsActivity"
Android:label="@string/title_activity_maps">
<intent-filter>
<action Android:name="Android.intent.action.MAIN" />
<category Android:name="Android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
場所の更新をリクエストする前に、要件に従って正しい場所の設定を確認する必要があります。
LocationSettingsRequest.Builderを作成し、アプリが使用するすべてのLocationRequestを追加します。
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder().addLocationRequest(mLocationRequest);
を使用して、場所の設定が満たされているかどうかを確認します
PendingResult<LocationSettingsResult> result =
LocationServices.SettingsApi.checkLocationSettings(mGoogleClient, builder.build());
保留中の結果が返されると、クライアントはLocationSettingsResultオブジェクトのステータスコードを確認して場所の設定を確認できます。
result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
@Override
public void onResult(LocationSettingsResult result) {
final Status status = result.getStatus();
final LocationSettingsStates = result.getLocationSettingsStates();
switch (status.getStatusCode()) {
case LocationSettingsStatusCodes.SUCCESS:
// All location settings are satisfied. The client can initialize location
// requests here.
...
break;
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
// Location settings are not satisfied. But could be fixed by showing the user
// a dialog.
try {
// Show the dialog by calling startResolutionForResult(),
// and check the result in onActivityResult().
status.startResolutionForResult(
MapsActivity.this,
REQUEST_CHECK_SETTINGS);
} catch (SendIntentException e) {
// Ignore the error.
}
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
// Location settings are not satisfied. However, we have no way to fix the
// settings so we won't show the dialog.
...
break;
}
}
});
ダイアログの結果は、onActivityResult（int、int、Intent）を介して返されます
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
final LocationSettingsStates states = LocationSettingsStates.fromIntent(intent);
switch (requestCode) {
case REQUEST_CHECK_SETTINGS:
switch (resultCode) {
case Activity.RESULT_OK:
// All required changes were successfully made
...
break;
case Activity.RESULT_CANCELED:
// The user was asked to change settings, but chose not to
...
break;
default:
break;
}
break;
}
}
参考までに、ケースを非常によく説明している SettingsApi ドキュメントをお読みください。
または、ユーザーを場所の設定ページに直接リダイレクトすることもできます。
int locationMode = Settings.Secure.getInt(activityUnderTest.getContentResolver(), Settings.Secure.LOCATION_MODE);
location_mode で可能な戻り値を確認してください。
if(locationMode == LOCATION_MODE_HIGH_ACCURACY) {
//request location updates
} else { //redirect user to settings page
startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));
}
あなたがフラグメントを使用している原因となるクラスまたはグーグルサポートマップであるかどうかにかかわらず、あなたのグーグルマップをxmlから変更してみてください。
ここに
@Override
public void onConnected(@Nullable Bundle bundle) {
locationrequest = new LocationRequest().create();
locationrequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationrequest.setInterval(1000);
if (ActivityCompat.checkSelfPermission(this, Android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
LocationServices.FusedLocationApi.requestLocationUpdates(mgoogleApi, locationrequest, this);
Toast.makeText(context,"Location Connected and ready to publish",Toast.LENGTH_SHORT).show();
}