Question

我正在创建一个Android应用程序。目前，该位置是硬编码的。经度和纬度在oncreate方法中声明。我创建了一种方法来获取oncreate方法之外的经度和纬度。

这是oncreate方法

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate( savedInstanceState );
    setContentView( R.layout.activity_home );

    locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
    getLocation();

    //Doublin Co-ordinates
    final double latitude = 53.3498;
    final double longitude = -6.2603;

    //Getting th data
    getForecast(latitude, longitude);
    Log.d(Tag,"MAIN UI code running");
}

您可以看到latitude和latitude变量中的位置是硬编码的。

我还创建了一种获取用户手机最后已知坐标的方法。这不是oncreate方法。

void getLocation() {
    if(ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
            != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
            != PackageManager.PERMISSION_GRANTED) {

        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION);

    } else {
        Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

        if (location != null){
            double latti = location.getLatitude();
            double longi = location.getLongitude();;
        } else {
            Toast.makeText( this, "Unable to get location. Please try again:", Toast.LENGTH_LONG ).show();

        }
    }
}

如何在位置方法中将latti和longi的值分配给longitude方法中的latitude和oncreate。

Answer 1

如何在该位置分配latti和longi的值方法，WebView方法中的经度和纬度。

我建议你将纬度和经度声明为全局变量（超出WebView方法）

SMWebView

然后在oncreate函数

onCreate

或者您可以将这两个变量传递给final double latitude = 53.3498; final double longitude = -6.2603;方法。

getLocation

以这种方式修改if (location != null){ double latti = latitude ; double longi = longitude; } else { Toast.makeText( this, "Unable to get location. Please try again:", Toast.LENGTH_LONG ).show(); }功能

getLocation

Answer 2

最好的方法是将字段声明为全局字段，然后将值分配给字段，然后在onCreate()或您想要的位置使用它。

从getLocation()

返回一对实例

onCreate() {
    ....
    Pair<Double, Double> locationInfo = getLocation();

    final double latitude = locationInfo.first;
    final double longitude = locationInfo.second;
}


Pair<Double, Double> getLocation(){
    ....
    double latti = location.getLatitude();
    double longi = location.getLongitude();

    return new Pair<Double, Double>(latti, longi);
}

您可以使用getLocation()方法执行位置实例，并在onCreate()

Answer 3

在MainActivity中声明latti和longi。就像我在这做的那样代码。

2.在调用设置getLocation()和latti值的方法longi后，设置latitude和longitude的值。请参阅代码

请尝试以下代码：

public class MainActivity extends Activity 

{
        double latti; //new code
        double longi; //new code

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate( savedInstanceState );
    setContentView( R.layout.activity_home );

    locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
    getLocation();

    //Doublin Co-ordinates
    final double latitude = latti; //i changed this line
    final double longitude = longi;//i changed this line

    //Getting th data
    getForecast(latitude, longitude);
    Log.d(Tag,"MAIN UI code running");
} //end of onCreate

void getLocation() {
    if(ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
            != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
            != PackageManager.PERMISSION_GRANTED) {

        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION);

    } else {
        Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

        if (location != null){
             latti = location.getLatitude();//i changed this line, (drooped the double)
             longi = location.getLongitude();//i changed this line, (drooped the double)
        } else {
            Toast.makeText( this, "Unable to get location. Please try again:", Toast.LENGTH_LONG ).show();

        }
    }
}

    } //end of MainActvity

另一种解决方案是吸气剂和放大器。 setter方法。（旁注：你不需要纬度和经度，你可以只使用latti和longi）

将变量从方法传递到onCreate方法中的另一个变量

3 个答案: