我有同樣的問題,但developer.android.com來救援。
只需訪問這兩個環節,問題就解決了:
Last Known location
Requesting Permissions
仍然以供參考。我的代碼:
public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, OnConnectionFailedListener {
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
TextView mLatitudeText, mLongitudeText;
final int MY_PERMISSIONS_REQUEST_MAPS = 1;
protected void onStart() {
mGoogleApiClient.connect();
super.onStart();
}
protected void onStop() {
mGoogleApiClient.disconnect();
super.onStop();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mLatitudeText = (TextView) findViewById(R.id.textView);
mLongitudeText = (TextView) findViewById(R.id.textView2);
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
Log.i("permit Fine", ""+ ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION));
Log.i("permit coarse", ""+ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_COARSE_LOCATION));
}
@Override
public void onConnected(@Nullable Bundle bundle) {
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.
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.READ_CONTACTS)) {
// 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.
Log.i("in","Explaination");
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION,Manifest.permission.ACCESS_COARSE_LOCATION},
MY_PERMISSIONS_REQUEST_MAPS);
Log.i("in","Else");
// MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
// app-defined int constant. The callback method gets the
// result of the request.
}
return;
}
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
if (mLastLocation != null) {
mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude()));
mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude()));
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_MAPS: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// contacts-related task you need to do.
Log.i("permit Fine", ""+ ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION));
Log.i("permit coarse", ""+ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_COARSE_LOCATION));
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
}
先了解而其強制在該代碼添加權限檢查。這將導致你解決你的問題。提示: - 超過23個需要進行權限檢查的android版本。並在運行時詢問權限。這只是發生你的構建版本是23或更高版本 –
我已經添加了權限,但我仍然得到位置爲空。你有沒有找到解決方案? – Avijeet