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[英]android location apis : FusedLocationApi.getLastLocation is giving null
[英]FusedLocationApi.getLastLocation always returns null(android 6.0,api 23)
我在手機上試試。 它總是返回空值。 為什么?(授予所有權限。ACCESS_COARSE_LOCATION ACCESS_FINE_LOCATION)
fusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
return;
}
fusedLocationClient.getLastLocation()
.addOnSuccessListener(this, new OnSuccessListener<Location>() {
@Override
public void onSuccess(Location location) {
if (location != null) {
Toast.makeText(MainActivity.this, "Location: "+location, Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(MainActivity.this, "null", Toast.LENGTH_SHORT).show();
}
});
依賴項:
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.google.android.gms:play-services-location:16.0.0'}
顯現:
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
永遠無法保證您從getLastLocation()
獲得位置。 通常這意味着沒有任何應用程序使用 GPS 來獲取您的位置,因此不會緩存任何內容。
通常你所要做的就是打開谷歌地圖或某個位置一旦鎖定就會被緩存的東西
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