I have a problem similar to this one Android studio 3.0 shows Attempt to invoke virtual method 'java.lang.String java.lang.String.toString()' on a null object reference so i did this.
private void getDirection() {
currentPosition = new LatLng(mLastLocation.getLatitude(),mLastLocation.getLongitude());
String requestAPI = null;
try{
requestAPI = "https://maps.googleapis.com/maps/api/directions/json?" +
"mode=driving&" +
"transit_routing_preference=less_driving&" +
"origin=" + currentPosition.latitude + "," + currentPosition.longitude + "&" +
"destination"+destination+"&"+"key="+getResources().getString(R.string.google_direction_api);
Log.d("TriBER",requestAPI); //Print URL for debug
mService.getPath(requestAPI)
.enqueue(new Callback<String>() {
@Override
public void onResponse(Call<String> call, Response<String> response) {
try {
JSONObject jsonObject = new JSONObject(response.body().toString());
JSONArray jsonArray = jsonObject.getJSONArray("routes");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject route = jsonArray.getJSONObject(i);
JSONObject poly = route.getJSONObject("overview_polyline");
String polyline = poly.getString("points");
polyLineList = decodePoly(polyline);
//Adjusting bounds
LatLngBounds.Builder builder = new LatLngBounds.Builder();
for (LatLng latLng : polyLineList)
builder.include(latLng);
LatLngBounds bounds = builder.build();
CameraUpdate mCameraUpdate = CameraUpdateFactory.newLatLngBounds(bounds, 2);
mMap.animateCamera(mCameraUpdate);
polylineOptions = new PolylineOptions();
polylineOptions.color(Color.GRAY);
polylineOptions.width(5);
polylineOptions.startCap(new SquareCap());
polylineOptions.endCap(new SquareCap());
polylineOptions.jointType(JointType.ROUND);
polylineOptions.addAll(polyLineList);
greyPolyline = mMap.addPolyline(polylineOptions);
blackPolylineOptions = new PolylineOptions();
blackPolylineOptions.color(Color.BLACK);
blackPolylineOptions.width(5);
blackPolylineOptions.startCap(new SquareCap());
blackPolylineOptions.endCap(new SquareCap());
blackPolylineOptions.jointType(JointType.ROUND);
blackPolyline = mMap.addPolyline(blackPolylineOptions);
mMap.addMarker(new MarkerOptions()
.position(polyLineList.get(polyLineList.size() - 1))
.title("Pickup Location"));
//Animation
ValueAnimator polyLineAnimator = ValueAnimator.ofInt(0, 100);
polyLineAnimator.setDuration(2000);
polyLineAnimator.setInterpolator(new LinearInterpolator());
polyLineAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
List<LatLng> points = greyPolyline.getPoints();
int percentValue = (int) animation.getAnimatedValue();
int size = points.size();
int newPoints = (int) (size * (percentValue / 100.0f));
List<LatLng> p = points.subList(0, newPoints);
blackPolyline.setPoints(p);
}
});
polyLineAnimator.start();
carMarker = mMap.addMarker(new MarkerOptions().position(currentPosition)
.flat(true)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.car)));
handler = new Handler();
index = -1;
next = 1;
handler.postDelayed(drawPathRunnable, 3000);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public void onFailure(Call<String> call, Throwable t) {
Toast.makeText(Welcome.this, "" + t.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
catch (Exception e)
{
e.printStackTrace();
}
}
But when i press the GO Button, Toast "Error" is popping out. it is supposed to draw route from current location to the destination. can someone teach me the right thing to do? thank you
my logcat
Attempt to invoke virtual method 'java.lang.String java.lang.String.toString()' on a null object reference
at com.clone.uber.uberclone.Welcome$4.onResponse(Welcome.java:240)
at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:70)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5912)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
at com.android.internal.os.ZygoteInit.main
