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Android

Lukas Baumgartner
Lukas Baumgartner
14,817 Points
Posted by Lukas Baumgartner
Lukas Baumgartner
14,817 Points

Add location awareness to Stormy

Hy guys!

I followed the course on how to make your own weather app. And now i tried the challenge to make the app location aware. But since I'm a programming noob, I'm struggeling hard with this task.

So I followed the maps blog of Mr. Ben Jakuben, but it didn't really help me. Then, I looked into the Android developer guides, but well... After long hours of reading i was even more confused...

So my question is: Could anyone please help me understand what I'm doing wrong here? Or how must i proceed so that my code works?

To beginn with, I just want this App to display my current latitude and longitude in two textviews. Didn't look that hard at first, but then I stumpled accross the Permission Check(s) and i absolutley don't know how to handle that...

So here is my code, basically copied of the Android developers guide:

public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {


    private GoogleApiClient mGoogleApiClient;
    private Location mLastLocation;
    private TextView mLatitudeText;
    private TextView mLongitudeText;

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

        onStart();

        if (mGoogleApiClient == null) {
            mGoogleApiClient = new GoogleApiClient.Builder(this)
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .addApi(LocationServices.API)
                    .build();
        }

    }

    protected void onStart() {
        super.onStart();
        mGoogleApiClient.connect();
    }

    protected void onStop() {
        mGoogleApiClient.disconnect();
        super.onStop();
    }

    @Override
    public void onConnected(Bundle connectionHint) {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
            ActivityCompat.checkSelfPermission(this, 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.
            return;
        }
        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
        if (mLastLocation != null) {
            mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude()));
            mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude()));
        }
    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {

    }
}
Lukas Baumgartner
Lukas Baumgartner
14,817 Points
Lukas Baumgartner
Lukas Baumgartner
14,817 Points

Finally, after playing around even more, I made it do what I want it to do :D

Here is my working code if you want to refere to it!

public class MainActivity extends AppCompatActivity implements
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener{

    private static final String TAG = MainActivity.class.getSimpleName();
    private static final int PERMISSION_REQUEST_CODE = 5000;

    private GoogleApiClient mGoogleApiClient;
    private Location mLastLocation;
    private TextView mLatitudeText;
    private TextView mLongitudeText;

    private String mWriteLat;
    private String mWriteLon;

    private double mCurrentLatitude;
    private double mCurrentLongitude;


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


        buildGoogleApiClient();

        Log.i(TAG, "Write lat lon into textviews");
        mLatitudeText = (TextView) findViewById(R.id.latitudeTextView);
        mLongitudeText = (TextView) findViewById((R.id.longitudeTextView));




    }

    private synchronized void buildGoogleApiClient(){
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();

    }


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

    @Override
    protected void onStop() {
        super.onStop();
        if (mGoogleApiClient.isConnected()) {
            mGoogleApiClient.disconnect();
        }
    }

     //Runs when a GoogleApiClient object successfully connects.
    @Override
    public void onConnected(Bundle connectionHint) {
        Log.i(TAG, "checking permissions");
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED &&
                ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            Toast.makeText(this, "Permissions already granted. Getting Location now", Toast.LENGTH_LONG).show();


                mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
                if (mLastLocation != null) {

                    mCurrentLatitude = mLastLocation.getLatitude();
                    mCurrentLongitude = mLastLocation.getLongitude();

                    Log.i(TAG, "Lat: " + mCurrentLatitude + "Lon: " + mCurrentLongitude);

                    mLatitudeText.setText(mCurrentLatitude + "");
                    mLongitudeText.setText(mCurrentLongitude + "");

                } else {
                    //Permissions missing --> start request
                    requestLocationPermissions();
                }

        }
    }

    private void requestLocationPermissions(){
        if(ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION)){
            Toast.makeText(this, "Location permissions are required", Toast.LENGTH_LONG).show();
            ActivityCompat.requestPermissions(this,
                    new String[]{   Manifest.permission.ACCESS_FINE_LOCATION,
                                    Manifest.permission.ACCESS_COARSE_LOCATION}, PERMISSION_REQUEST_CODE);
        }else{
            Toast.makeText(this, "Location permissions are required", Toast.LENGTH_LONG).show();
            ActivityCompat.requestPermissions(this,
                    new String[]{   Manifest.permission.ACCESS_FINE_LOCATION,
                            Manifest.permission.ACCESS_COARSE_LOCATION}, PERMISSION_REQUEST_CODE);
        }
    }


    @Override
    public void onConnectionFailed(ConnectionResult result) {
        Log.i(TAG, "Connection failed: ConnectionResult.getErrorCode() = " + result.getErrorCode());
    }

    @Override
    public void onConnectionSuspended(int cause) {
        Log.i(TAG, "Connection suspended");
        mGoogleApiClient.connect();
    }
}