无法在Android中的Dialog类中添加一些覆盖方法

Posted 2021-04-18

我创建了一个扩展Dialog类的类。在本课程中，我想在此课程中添加“位置更改”代码。当我尝试做同样的事情时，它向我展示了2个问题

1. 一个是方法不会覆盖它超类
2. 错误的第一个参数类型：找到：'android.context.Context'，必需：'android.support.v4.app.FragmentActivity'

现在代码相同

public class DialogChooseYourLocation extends Dialog implements View.OnClickListener, GoogleApiClient.ConnectionCallbacks,
    GoogleApiClient.OnConnectionFailedListener,
    LocationListener {


private Location mylocation;
private GoogleApiClient googleApiClient;
private final static int REQUEST_CHECK_SETTINGS_GPS = 0x1;
private final static int REQUEST_ID_MULTIPLE_PERMISSIONS = 0x2;

Double latitude;
Double longitude;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setUpGClient();
}

//在这里得到错误：错误的第一个参数类型：找到：'android.context.Context'，必需：'android.support.v4.app.FragmentActivity'

private synchronized void setUpGClient() {
    googleApiClient = new GoogleApiClient.Builder(context)
            .enableAutoManage(getContext(), 0, this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(LocationServices.API)
            .build();
    googleApiClient.connect();
}

//获取错误：一个方法不会覆盖超类

@Override
public void onLocationChanged(Location location) {
    mylocation = location;
    if (mylocation != null) {
        latitude = mylocation.getLatitude();
        longitude = mylocation.getLongitude();
        Log.e("TAG", "onLocationChanged: " + "Latitude : " + latitude + "Longitude : " + longitude);
        GeoLocation();
        //Or Do whatever you want with your location
    }
}


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
        case REQUEST_CHECK_SETTINGS_GPS:
            switch (resultCode) {
                case Activity.RESULT_OK:
                    getMyLocation();
                    break;
                case Activity.RESULT_CANCELED:
                    ((Activity) context).finish();
                    break;
            }
            break;
    }
}

private void checkPermissions() {
    int permissionLocation = ContextCompat.checkSelfPermission(context,
            android.Manifest.permission.ACCESS_FINE_LOCATION);
    List<String> listPermissionsNeeded = new ArrayList<>();
    if (permissionLocation != PackageManager.PERMISSION_GRANTED) {
        listPermissionsNeeded.add(android.Manifest.permission.ACCESS_FINE_LOCATION);
        if (!listPermissionsNeeded.isEmpty()) {
            ActivityCompat.requestPermissions(getOwnerActivity(),
                    listPermissionsNeeded.toArray(new String[listPermissionsNeeded.size()]), REQUEST_ID_MULTIPLE_PERMISSIONS);
        }
    } else {
        getMyLocation();
    }

}

//获取错误：一个方法不会覆盖超类

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    int permissionLocation = ContextCompat.checkSelfPermission(context,
            Manifest.permission.ACCESS_FINE_LOCATION);
    if (permissionLocation == PackageManager.PERMISSION_GRANTED) {
        getMyLocation();
    }
}

}

答案

在enableAutoManage方法错误的第一个参数类型： - 此方法需要第一个参数作为FragmentActivit的引用，但是您已经传递了Context的引用。所以有两个解决方案。您必须将FragmentActivity扩展到您的类DialogChooseYourLocation并将您的类的引用作为enableAutoManage方法中的第一个参数传递。或者你可以简单地删除enableAutoManage方法并手动处理connect/disconnect，如下所示。

@Override
private synchronized void setUpGClient() {
    googleApiClient = new GoogleApiClient.Builder(context)
        .addConnectionCallbacks(this)
        .addOnConnectionFailedListener(this)
        .addApi(LocationServices.API)
        .build();
    googleApiClient.connect();
}

@Override
protected void onStart() {
    super.onStart();
    googleApiClient.connect();
}

@Override
protected void onStop() {
    super.onStop();
    googleApiClient.disconnect();
}

onLocationChanged方法不会覆盖它超类： - 只需检查要导入的LocationListener。有2个不同的LocationListener。 com.google.android.gms.location.LocationListener和android.location.LocationListener。你应该使用com.google.android.gms.location.LocationListener

onRequestPermissionsResult方法不会覆盖它超类： - 你的类DialogChooseYourLocation没有实现ActivityCompat.OnRequestPermissionsResultCallback，所以它没有onRequestPermissionsResult来覆盖。当你调用ActivityCompat.requestPermissions时，是父节点正在接收onRequestPermissionsResult的回调，它不会自动调用你的DialogChooseYourLocation中的任何方法。您需要手动将Activity的onRequestPermissionsResult中的信息传递给DialogChooseYourLocation。