要解决这个问题,可以通过以下代码示例来判断设备位置是否已启用,并在启用时调用onLocationResult()方法:
public class MainActivity extends AppCompatActivity {
private FusedLocationProviderClient fusedLocationProviderClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
checkLocationSettings();
}
private void checkLocationSettings() {
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
.addLocationRequest(createLocationRequest());
SettingsClient settingsClient = LocationServices.getSettingsClient(this);
Task task = settingsClient.checkLocationSettings(builder.build());
task.addOnSuccessListener(this, new OnSuccessListener() {
@Override
public void onSuccess(LocationSettingsResponse locationSettingsResponse) {
// 设备位置已启用,可以开始获取位置信息
startLocationUpdates();
}
});
task.addOnFailureListener(this, new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
if (e instanceof ResolvableApiException) {
try {
// 设备位置未启用,显示对话框提示用户打开位置设置
ResolvableApiException resolvable = (ResolvableApiException) e;
resolvable.startResolutionForResult(MainActivity.this, REQUEST_CHECK_SETTINGS);
} catch (IntentSender.SendIntentException sendEx) {
// Ignore the error
}
}
}
});
}
private void startLocationUpdates() {
fusedLocationProviderClient.requestLocationUpdates(createLocationRequest(), new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {
// 在此处理位置更新
}
}, null);
}
private LocationRequest createLocationRequest() {
LocationRequest locationRequest = new LocationRequest();
locationRequest.setInterval(10000);
locationRequest.setFastestInterval(5000);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
return locationRequest;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_CHECK_SETTINGS) {
if (resultCode == RESULT_OK) {
// 用户已打开位置设置,可以开始获取位置信息
startLocationUpdates();
}
}
}
}
在上面的代码中,首先通过checkLocationSettings()
方法来检查设备位置设置。如果设备位置已启用,则直接调用startLocationUpdates()
方法开始获取位置信息。如果设备位置未启用,则通过ResolvableApiException
启动一个对话框,提示用户打开位置设置。用户在打开位置设置后,会触发onActivityResult()
方法,然后再次调用startLocationUpdates()
方法开始获取位置信息。
请注意,在startLocationUpdates()
方法中,使用requestLocationUpdates()
方法注册了一个LocationCallback
对象,该对象中的onLocationResult()
方法将在位置更新时被调用,您可以在该方法中处理位置信息。
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