我正在研究我的第一個應用程序,它是一個非常簡單的應用程序。點擊按鈕發送經度/緯度到服務器/數據庫。我正在使用Google Play服務進行定位,並且正在使用Nexus 9平板電腦進行測試。 我發現使用設置>位置(在Nexus 9上) - 高精度&低精度工作正常。數據正確併發送到服務器。但是,當選擇「僅限設備」(GPS)時,它找不到長/緯。我得到我的烤麪包:Android Studio'Device Only'Location with Google Play Services not working
Toast.makeText(MainActivity.this, "Network isn't available", Toast.LENGTH_LONG).show();
我是新來的,所以仍然不知道我可能會出錯。我確實有清單文件w/
uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"
和Google Play服務在我的Gradle文件中。因爲它確實有WiFi無論如何。
而且我也把
System.out.println("Longitude (function name)" + longitude + " and Latitude: " + latitude);
來查看日誌的時候正在拿起經度/緯度(點擊按鈕,只有當,否則它是0.0)我在去年的測試中,我使用的高精度,並得到了朗/緯度。關閉Wifi和更改位置,它正在接收我的新位置(但由於沒有互聯網連接而無法發送數據)。所以我很困惑,因爲GPS不是以高精度來拾取我的新位置嗎?
不確定是否重要,但我希望只有「設備唯一」的位置以及高精度。 任何幫助將不勝感激!這裏是我的代碼(縮短了,如果我缺少任何東西,請讓我知道添加!)謝謝!
public class MainActivity extends Activity implements ConnectionCallbacks,
OnConnectionFailedListener {
private GoogleApiClient mGoogleApiClient;
private Location mLastLocation;
private Button btnNewShowLocation;
private double longitude;
private double latitude;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (checkPlayServices()) {
buildGoogleApiClient();
//**UPDATED**
createLocationRequest()
}
btnNewShowLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mLastLocation != null) {
postDataToServer("web site address- EDIT");
} else {
Toast.makeText(MainActivity.this, "Network isn't available", Toast.LENGTH_LONG).show();
}}});}
// **UPDATED**
protected void createLocationRequest() {
mLocationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY)
.setInterval(UPDATE_INTERVAL)
.setFastestInterval(FATEST_INTERVAL)
.setSmallestDisplacement(DISPLACEMENT);
private void postDataToServer(String uri) {
RequestPackage p = new RequestPackage();
p.setMethod("POST");
p.setUri(uri);
p.setParam("longitude", String.valueOf(longitude));
p.setParam("latitude", String.valueOf(latitude));
MyTask task = new MyTask();
task.execute(p);
System.out.println("Longitude (post data to server)" + longitude + " and Latitude: " + latitude);
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API).build();
}
private boolean checkPlayServices() {
int resultCode = GooglePlayServicesUtil
.isGooglePlayServicesAvailable(this);
if (resultCode != ConnectionResult.SUCCESS) {
if (GooglePlayServicesUtil.isUserRecoverableError(resultCode)) {
GooglePlayServicesUtil.getErrorDialog(resultCode, this,
PLAY_SERVICES_RESOLUTION_REQUEST).show();
} else {
Toast.makeText(getApplicationContext(),
"This device is not supported.", Toast.LENGTH_LONG)
.show();
finish();
}
return false;
}
return true;
}
@Override
public void onConnected(Bundle arg0) {
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
System.out.println("Longitude (on Connected): " + longitude + " and Latitude: " + latitude);
if (mLastLocation != null) {
latitude = mLastLocation.getLatitude();
longitude = mLastLocation.getLongitude();
} else {
Toast.makeText(getApplicationContext(), "Searching for your location... \nMake sure WiFi or GPS is turned On", Toast.LENGTH_LONG).show();
}}}
這裏是高準確度和關閉Wifi的日誌記錄。
I/System.out﹕ Longitude (on Connected): 0.0 and Latitude: 0.0
I/System.out﹕ Longitude (post data to server)-88.7777777 and Latitude: 55.7777777
W/System.err﹕ java.net.UnknownHostException: Unable to resolve host
Wifi最後一行關閉。
我認爲你需要創建'LocationRequest'對象和'setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY) .setInterval(間隔) .setFastestInterval(fastestInterval) .setSmallestDisplacement(minDisplacement);'有關詳細信息,你可以試試我的代碼[here](https://github.com/jbj88817/getLastLocationUsingGPS-android/blob/master/app/src/main/java/com/bojie/locationex/MapsActivity.java#L87-L93)。 – bjiang
感謝@bjiang我確實嘗試過,它確實有效。現在不是。我把它放在一個函數 '保護無效createLocationRequest(){ mLocationRequest = LocationRequest.create().setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY) .setInterval(更新週期) .setFastestInterval(FATEST_INTERVAL) .setSmallestDisplacement(位移);'並在OnCreate中調用它。在調試器中,我得到「僅限設備」的getLastLocation = null。我會繼續努力 – JackZ
你有沒有嘗試我的代碼[這裏](https://github.com/jbj88817/getLastLocationUsingGPS-android)? – bjiang