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Error on cordova plugin: callback returning error

On my www/RuptionARPlugin.js file I have the followig code:
RuptionARPlugin.prototype.loadWorld = function(successCallback, errorCallback) {
cordova.exec(successCallback, errorCallback, "RuptionARPlugin", "open", []);
// We add an event listener on the resume and pause event of the application life-cycle
document.addEventListener("resume", this.onResume, false);
document.addEventListener("pause", this.onPause, false);
document.addEventListener("backbutton", this.onBackButton, false);
};
On my RuptionARPlugin.java I have the following
(...)
public class RuptionARPlugin extends CordovaPlugin {
(...)
private static final String ACTION_OPEN = "open";
(...)
private HelloARRuption helloARRuption
(...)
public boolean execute(String action, JSONArray args, final CallbackContext callbackContext) throws JSONException {
(...)
if (RuptionARPlugin.ACTION_OPEN.equals(action)) {
this.openCallback = callbackContext;
boolean cameraPermissionRequesrRequired = !cordova.hasPermission(Manifest.permission.CAMERA);
_locationPermissionRequestRequired = !cordova.hasPermission(Manifest.permission.ACCESS_FINE_LOCATION) && !cordova.hasPermission(Manifest.permission.ACCESS_COARSE_LOCATION);
if(cameraPermissionRequesrRequired && _locationPermissionRequestRequired) {
_cameraPermissionGranted = false;
this.cordova.requestPermissions(this, CAMERA_PERMISSION_REQUEST_CODE, new String[] {Manifest.permission.CAMERA, Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION} );
} else if (cameraPermissionRequesrRequired) {
this.cordova.requestPermissions(this, CAMERA_PERMISSION_REQUEST_CODE, new String[] {Manifest.permission.CAMERA});
} else if (_locationPermissionRequestRequired) {
_cameraPermissionGranted = true;
this.cordova.requestPermissions(this, CAMERA_PERMISSION_REQUEST_CODE, new String[] {Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION});
} else {
helloARRuption.onSurfaceCreated(render);
helloARRuption.onSurfaceChanged(render, width, height);
helloARRuption.onDrawFrame(render);
}
return true;
}
(...)
}
(...)
protected static class HelloARRuption extends HelloArActivity {
#Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if(!hasFocus) {
this.getCurrentFocus();
}
}
#Override
protected void onResume() {
super.onResume();
}
}
(...)
}
On my library file, I have the definition of HelloARActivity classes.
When I generate the plugin and add it to a project, the callback I receive is the error one. I don't know what happens inside the open function.
My Cordova plugin is on https://github.com/ruption-lda/ruption-ar-cordova-plugin
Can someone please help?

After builing my app and Installing Google Maps API, My APP crashes anytime I tend to search for Location

I am new to this programming and I am finding it difficult to get past this stage. After building APP successfully, I added Google Map to get real time Location. After doing this, my app crashes each time I click the switch button.
Please if you can help me source out the issue, I would be very happy as this will help me a lot. Below is my Logcat
09-22 15:59:04.636 4803-4803/com.example.mac.uberclone E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.mac.uberclone, PID: 4803
java.lang.NullPointerException: Attempt to read from field 'int com.google.android.gms.location.LocationRequest.a' on a null object reference
at android.os.Parcel.createException(Parcel.java:1948)
at android.os.Parcel.readException(Parcel.java:1910)
at android.os.Parcel.readException(Parcel.java:1860)
at com.google.android.gms.internal.location.zza.transactAndReadExceptionReturnVoid(Unknown Source:10)
at com.google.android.gms.internal.location.zzap.zza(Unknown Source:9)
at com.google.android.gms.internal.location.zzas.zza(Unknown Source:44)
at com.google.android.gms.internal.location.zzaz.zza(Unknown Source:5)
at com.google.android.gms.internal.location.zzr.doExecute(Unknown Source:25)
at com.google.android.gms.common.api.internal.BaseImplementation$ApiMethodImpl.run(Unknown Source:10)
at com.google.android.gms.common.api.internal.zzag.execute(Unknown Source:71)
at com.google.android.gms.common.api.internal.zzbd.execute(Unknown Source:5)
at com.google.android.gms.common.api.internal.zzav.execute(Unknown Source:137)
at com.google.android.gms.internal.location.zzq.requestLocationUpdates(Unknown Source:14)
at com.example.mac.uberclone.Welcome.startLocationUpdate(Welcome.java:269)
at com.example.mac.uberclone.Welcome.onConnected(Welcome.java:283)
at com.google.android.gms.common.internal.GmsClientEventManager.onConnectionSuccess(Unknown Source:109)
at com.google.android.gms.common.api.internal.zzav.zzb(Unknown Source:22)
at com.google.android.gms.common.api.internal.zzaj.zzat(Unknown Source:92)
at com.google.android.gms.common.api.internal.zzaj.onConnected(Unknown Source:21)
at com.google.android.gms.common.api.internal.zzbd.onConnected(Unknown Source:7)
at com.google.android.gms.common.api.internal.zzp.onConnected(Unknown Source:5)
at com.google.android.gms.common.internal.zzf.onConnected(Unknown Source:2)
at com.google.android.gms.common.internal.BaseGmsClient$PostInitCallback.handleServiceSuccess(Unknown Source:130)
at com.google.android.gms.common.internal.BaseGmsClient$zza.deliverCallback(Unknown Source:62)
at com.google.android.gms.common.internal.BaseGmsClient$zza.deliverCallback(Unknown Source:2)
at com.google.android.gms.common.internal.BaseGmsClient$CallbackProxy.deliverCallback(Unknown Source:51)
at com.google.android.gms.common.internal.BaseGmsClient$zzb.handleMessage(Unknown Source:270)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Also in my Build Gradle App
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.github.glomadrian:MaterialAnimatedSwitch:1.1#aar'
implementation 'com.firebase:geofire-android:2.3.1'
implementation 'com.android.support:appcompat-v7:28.0.0-rc02'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.google.firebase:firebase-auth:16.0.3'
implementation 'com.google.android.gms:play-services-maps:15.0.1'
implementation 'com.google.android.gms:play-services-location:15.0.1'
implementation 'com.google.android.gms:play-services-analytics:16.0.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
//Add Library
implementation 'com.github.d-max:spots-dialog:0.7#aar'
implementation 'uk.co.chrisjenx:calligraphy:latest.integration'
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.rengwuxian.materialedittext:library:2.1.4'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support:cardview-v7:28.0.0'
implementation 'com.google.firebase:firebase-core:16.0.3'
implementation 'com.google.firebase:firebase-database:16.0.2'
implementation 'com.firebaseui:firebase-ui-database:4.1.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
}
apply plugin: 'com.google.gms.google-services'
this is my Welcome activity
package com.example.mac.uberclone;
import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Handler;
import android.os.SystemClock;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.Snackbar;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;
import android.widget.Toast;
import com.firebase.geofire.GeoFire;
import com.firebase.geofire.GeoLocation;
import com.github.glomadrian.materialanimatedswitch.MaterialAnimatedSwitch;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
public class Welcome extends FragmentActivity implements
OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener
{
private GoogleMap mMap;
//Play Service
private static final int MY_PERMISSION_REQUEST_CODE = 7000;
private static final int PLAY_SERVICE_RES_REQUEST = 7001;
private LocationRequest locationRequest;
private GoogleApiClient mGoogleApiClient;
private Location mLastLocation;
private static int UPDATE_INTERVAL = 5000;
private static int FASTEST_INTERVAL = 3000;
private static int DISPLACEMENT = 10;
DatabaseReference drivers;
GeoFire geoFire;
Marker mCurrent;
MaterialAnimatedSwitch location_switch;
SupportMapFragment mapFragment;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_welcome);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
//Init View
location_switch = (MaterialAnimatedSwitch)findViewById(R.id.location_switch);
location_switch.setOnCheckedChangeListener(new MaterialAnimatedSwitch.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(boolean isOnline) {
if (isOnline)
{
startLocationUpdate();
displayLocation();
Snackbar.make(mapFragment.getView(),"You are online",Snackbar.LENGTH_SHORT)
.show();
}
else
{
stopLocationUpdate();
mCurrent.remove();
Snackbar.make(mapFragment.getView(),"You are offline",Snackbar.LENGTH_SHORT)
.show();
}
}
});
//Geo Fire
drivers = FirebaseDatabase.getInstance().getReference("Drivers");
geoFire = new GeoFire (drivers);
setUpLocation();
}
//Press Ctrl+O
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
switch (requestCode)
{
case MY_PERMISSION_REQUEST_CODE:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
{
if (checkPlayServices())
{
buildGoogleApiClient();
createLocationRequest();
if (location_switch.isChecked())
displayLocation();
}
}
}
}
private void setUpLocation() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
{
//Request runtime permission
ActivityCompat.requestPermissions(this, new String[]{
Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION
},MY_PERMISSION_REQUEST_CODE);
}
else
{
if (checkPlayServices())
{
buildGoogleApiClient();
createLocationRequest();
if (location_switch.isChecked())
displayLocation();
}
}
}
private void createLocationRequest() {
LocationRequest locationRequest = LocationRequest.create();
locationRequest.setInterval(5000);
locationRequest.setFastestInterval(1000);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
private void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
private boolean checkPlayServices() {
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if (resultCode != ConnectionResult.SUCCESS)
{
if (GooglePlayServicesUtil.isUserRecoverableError(resultCode))
GooglePlayServicesUtil.getErrorDialog(resultCode,this,PLAY_SERVICE_RES_REQUEST).show();
else {
Toast.makeText(this, "This device is not supported", Toast.LENGTH_SHORT).show();
finish();
}
return false;
}
return true;
}
private void stopLocationUpdate() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
{
return;
}
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient,this);
}
private void displayLocation() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
{
return;
}
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (mLastLocation != null)
{
if (location_switch.isChecked())
{
final double latitude = mLastLocation.getLatitude();
final double longitude = mLastLocation.getLongitude();
//Update to firebase
geoFire.setLocation(FirebaseAuth.getInstance().getCurrentUser().getUid(), new GeoLocation(latitude, longitude), new GeoFire.CompletionListener() {
#Override
public void onComplete(String key, DatabaseError error) {
//Add marker
if (mCurrent != null)
mCurrent.remove(); //Remove already marker
mCurrent = mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.fromResource(R.drawable.car))
.position(new LatLng(latitude,longitude))
.title("You"));
// Move camera to this position
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(latitude,longitude),15.0f));
//Draw animation rotate marker
rotateMarker(mCurrent,-360,mMap);
}
});
}
else
{
Log.d("Error", "Cannot get your location");
}
}
}
private void rotateMarker(final Marker mCurrent, final float i, GoogleMap mMap) {
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
final float startRotation = mCurrent.getRotation();
final long duration = 1500;
final Interpolator interpolator = new LinearInterpolator();
handler.post(new Runnable() {
#Override
public void run() {
long elapsed = SystemClock.uptimeMillis() - start;
float t = interpolator.getInterpolation((float)elapsed/duration);
float rot = t*i+(1-t)*startRotation;
mCurrent.setRotation(-rot > 180?rot/2:rot);
if (t<1.0)
{
handler.postDelayed(this,16);
}
}
});
}
private void startLocationUpdate() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
{
return;
}
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,locationRequest,this);
}
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
}
#Override
public void onConnected(#Nullable Bundle bundle) {
displayLocation();
startLocationUpdate();
}
#Override
public void onConnectionSuspended(int i) {
mGoogleApiClient.connect();
}
#Override
public void onConnectionFailed(#NonNull ConnectionResult connectionResult) {
}
#Override
public void onLocationChanged(Location location) {
mLastLocation = location;
displayLocation();
}
}

You try to ask for location updates using that line
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,locationRequest,this);
The problem is that you never initialize locationRequest variable. You have next function
private void createLocationRequest() {
LocationRequest locationRequest = LocationRequest.create();
locationRequest.setInterval(5000);
locationRequest.setFastestInterval(1000);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
To fix your problem add this line at the end of createLocationRequest()
this.locationRequest = locationRequest

private void createLocationRequest() {
LocationRequest locationRequest = LocationRequest.create();
locationRequest.setInterval(5000);
locationRequest.setFastestInterval(1000);
locationRequest.setPriority (LocationRequest.PRIORITY_HIGH_ACCURACY);
this.locationRequest = locationRequest;
}
This was the solution to the problem.

Using Fused Location Provider for Wikitude

I previously used Android Location Manager to retrieve location. However, when I run wikitude apps, the POIs are loaded but are not displayed. I read a few posts saying that this may caused by basic Location Strategy. Therefore, I decided to use Fused Location Provider. The problem still occur. Please help me anyone
package xyz.arlayer.scratch;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.app.Activity;
import android.location.Location;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.wikitude.architect.ArchitectStartupConfiguration;
import com.wikitude.architect.ArchitectView;
import java.io.IOException;
public class Augmented extends Activity implements
LocationListener,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener {
private static final int WIKITUDE_PERMISSIONS_REQUEST_CAMERA = 2;
private ArchitectView architectView;
private static final String TAG = "LocationActivity";
private static final long INTERVAL = 1000 * 10;
private static final long FASTEST_INTERVAL = 1000 * 5;
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
Location mCurrentLocation;
protected void createLocationRequest() {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(INTERVAL);
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_augmented);
this.architectView = this.findViewById(R.id.architectView);
final ArchitectStartupConfiguration config = new ArchitectStartupConfiguration();
config.setLicenseKey("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");
this.architectView.onCreate(config);
Log.d(TAG, "onCreate ...............................");
//show error dialog if GoolglePlayServices not available
if (!isGooglePlayServicesAvailable()) {
finish();
}
createLocationRequest();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]
{android.Manifest.permission.CAMERA}, WIKITUDE_PERMISSIONS_REQUEST_CAMERA);
}}
#Override
protected void onPostCreate (Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
architectView.onPostCreate();
try {
architectView.load("file:///android_asset/08_Browsing$Pois_5_Native$Detail$Screen/index.html"); } catch (IOException e) {
e.printStackTrace();
}
}
#Override
public void onStart() {
super.onStart();
Log.d(TAG, "onStart fired ..............");
mGoogleApiClient.connect();
}
#Override
public void onStop() {
super.onStop();
Log.d(TAG, "onStop fired ..............");
mGoogleApiClient.disconnect();
Log.d(TAG, "isConnected ...............: " + mGoogleApiClient.isConnected());
}
private boolean isGooglePlayServicesAvailable() {
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if (ConnectionResult.SUCCESS == status) {
return true;
} else {
GooglePlayServicesUtil.getErrorDialog(status, this, 0).show();
return false;
}
}
#Override
public void onConnected(Bundle bundle) {
Log.d(TAG, "onConnected - isConnected ...............: " + mGoogleApiClient.isConnected());
startLocationUpdates();
}
protected void startLocationUpdates() {
PendingResult<Status> pendingResult = LocationServices.FusedLocationApi.requestLocationUpdates(
mGoogleApiClient, mLocationRequest, this);
Log.d(TAG, "Location update started ..............: ");
}
#Override
public void onConnectionSuspended(int i) {
}
#Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Log.d(TAG, "Connection failed: " + connectionResult.toString());
}
#Override
public void onLocationChanged(Location location) {
Log.d(TAG, "Firing onLocationChanged..............................................");
mCurrentLocation = location;
if (location!=null && Augmented.this.architectView != null ) {
// check if location has altitude at certain accuracy level & call right architect method (the one with altitude information)
if ( location.hasAltitude() && location.hasAccuracy() && location.getAccuracy()<7) {
Augmented.this.architectView.setLocation( location.getLatitude(), location.getLongitude(), location.getAltitude(), location.getAccuracy() );
} else {
Augmented.this.architectView.setLocation( location.getLatitude(), location.getLongitude(), location.hasAccuracy() ? location.getAccuracy() : 1000 );
}
}
}
#Override
public void onResume() {
super.onResume();
architectView.onResume();
if (mGoogleApiClient.isConnected()) {
startLocationUpdates();
Log.d(TAG, "Location update resumed .....................");
}
}
#Override
protected void onPause() {
architectView.onPause();
super.onPause();
stopLocationUpdates();
}
protected void stopLocationUpdates() {
LocationServices.FusedLocationApi.removeLocationUpdates(
mGoogleApiClient, this);
Log.d(TAG, "Location update stopped .......................");
}
#Override
protected void onDestroy(){
super.onDestroy();
architectView.onDestroy();
}
}

How to dismiss ProgressDialog in Volley and Internet connection error handling

I am trying to create this Volley project as my second activity which fetches a JSON feed from Yahoo Pipe and display in a ListView from here. The code works perfectly fine. However, I have encountered these problems:
When I have not turned the Internet on, the activity displays the loading ProgressDialog. However, pressing the Back button on my emulator or actual device does not dismiss the ProgressDialog. The activity did not respond to the Back action.
I tried this code, but it does not work or maybe I'm not doing it right:
#Override
public void onDestroy() {
super.onDestroy();
dismissPd();
}
private void dismissPd() {
if (pd != null) {
pd.dismiss();
pd = null;
}
}
In case of an Internet connection error, how do I display the error message in this activity as a toast?
The following is my code:
public class Trending extends ActionBarActivity {
private String TAG = this.getClass().getSimpleName();
private ListView lstView;
private RequestQueue mRequestQueue;
private ArrayList<NewsModel> arrNews ;
private LayoutInflater lf;
private VolleyAdapter va;
private ProgressDialog pd;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.trending);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Intent newActivity3=new Intent();
setResult(RESULT_OK, newActivity3);
lf = LayoutInflater.from(this);
arrNews = new ArrayList<NewsModel>();
va = new VolleyAdapter();
lstView = (ListView) findViewById(R.id.listView);
lstView.setAdapter(va);
mRequestQueue = Volley.newRequestQueue(this);
String url = "http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json";
pd = ProgressDialog.show(this,"Loading...","Please Wait...");
try {
Thread.sleep(2000);
} catch(Exception e) {
}
JsonObjectRequest jr = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
Log.i(TAG,response.toString());
parseJSON(response);
va.notifyDataSetChanged();
pd.dismiss();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.i(TAG,error.getMessage());
}
});
mRequestQueue.add(jr);
}
#Override
public void onDestroy() {
super.onDestroy();
dismissPd();
}
private void dismissPd() {
if (pd != null) {
pd.dismiss();
pd = null;
}
}
private void parseJSON(JSONObject json){
try {
JSONObject value = json.getJSONObject("value");
JSONArray items = value.getJSONArray("items");
for (int i=0; i<items.length(); i++) {
JSONObject item = items.getJSONObject(i);
NewsModel nm = new NewsModel();
nm.setTitle(item.optString("title"));
nm.setDescription(item.optString("description"));
nm.setLink(item.optString("link"));
nm.setPubDate(item.optString("pubDate"));
arrNews.add(nm);
}
}
catch(Exception e){
e.printStackTrace();
}
}
class NewsModel {
private String title;
private String link;
private String description;
private String pubDate;
void setTitle(String title) {
this.title = title;
}
void setLink(String link) {
this.link = link;
}
void setDescription(String description) {
this.description = description;
}
void setPubDate(String pubDate) {
this.pubDate = pubDate;
}
String getLink() {
return link;
}
String getDescription() {
return description;
}
String getPubDate() {
return pubDate;
}
String getTitle() {
return title;
}
}
class VolleyAdapter extends BaseAdapter {
#Override
public int getCount() {
return arrNews.size();
}
#Override
public Object getItem(int i) {
return arrNews.get(i);
}
#Override
public long getItemId(int i) {
return 0;
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
ViewHolder vh;
if (view == null) {
vh = new ViewHolder();
view = lf.inflate(R.layout.row_listview,null);
vh.tvTitle = (TextView) view.findViewById(R.id.txtTitle);
vh.tvDesc = (TextView) view.findViewById(R.id.txtDesc);
vh.tvDate = (TextView) view.findViewById(R.id.txtDate);
view.setTag(vh);
} else {
vh = (ViewHolder) view.getTag();
}
NewsModel nm = arrNews.get(i);
vh.tvTitle.setText(nm.getTitle());
vh.tvDesc.setText(nm.getDescription());
vh.tvDate.setText(nm.getPubDate());
return view;
}
class ViewHolder {
TextView tvTitle;
TextView tvDesc;
TextView tvDate;
}
}
}

try this one then back button is working while dialog is running
pd = ProgressDialog.show(this,"Loading...","Please Wait...");
pd.setCancelable(true);
By use asynctask you write code like this way
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
pd = ProgressDialog.show(ctx, null, "fetching ...");
pd.setCancelable(true);
super.onPreExecute();
}
#Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
try {
//fetch response from internet and process here
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
pd.cancel();
//do next action here
super.onPostExecute(result);
}

You have to execute the JSON part of the code in AsyncTask.
Define doInBackground to return a String type. From doInBackground, handle the errors, like internet error or json error and accordingly return a suitable error message "internet error" or "json error".
This error will be available as input to onPostExecute (results). In onPostExecute, you can run a Switch Statement to handle each of the conditions. If "internet error", then pd.dismiss() and do a toast.
For a working version of the code, you can refer here...

How we can execute a javascript function and get a return value in our android application?

How we can execute a javascript function and get a return value in our android appplication ?
We want to execute a javascript on a button press event, we need to pass parameters to the script and get return values, So we are using "WebChromeClient" to implement this,
But we got Exception is "SyntaxError: Parse error at undefined:1"
Following is my code
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.webkit.JsResult;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
public class FirstTab extends Activity
{
private WebView webView;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.regis);
try{
webView = (WebView) findViewById(R.id.webView1);
webView.getSettings().setJavaScriptEnabled(true);
webView.setWebChromeClient(new MyWebChromeClient());
String customHtml = "<html><head><title>iSales</title><script type=\"text/javascript\"> function fieldsOnDelete(){ var x=123; return \"JIJO\"; } </script></head><body>hi</body></html>";
webView.loadData(customHtml, "text/html","UTF-8");
}catch(Exception e)
{
Log.v("JAC LOG",e.toString());
}
}
public void onResume()
{
super.onResume();
final Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try{
webView.loadUrl("javascript:alert(javascript:fieldsOnDelete())");
}
catch(Exception e)
{
Log.v("JAC LOG",e.toString());
}
}
});
}
final class MyWebChromeClient extends WebChromeClient {
#Override
public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
Log.v("LogTag", message);
result.confirm();
return true;
}
}
}

you can use mWebView.loadUrl("javascript:checkName"); to call the method...
Then you can use addJavascriptInterface() to add a Java object to the Javascript environment. Have your Java script call a method on that Java object to supply its "return value".
EDIT1: Or you can use following hack:
Add this Client to your WebView:
final class MyWebChromeClient extends WebChromeClient {
#Override
public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
Log.d("LogTag", message);
result.confirm();
return true;
}
}
Now in your java script call do:
webView.loadUrl("javascript:alert(functionThatReturnsSomething)");
Now in the onJsAlert call "message" will contain the returned value.
Edit2:
So it does not work if we call javascript method just after call to load the URL since the page loads take time. So I created a test program to test that...
Following is my html file (named test.html) store in the assets folder:
<html>
<head>
<script language="javascript">
function fieldsOnDelete(message) {
alert("i am called with " + message);
window.myjava.returnValue(message + " JIJO");
}
</script>
<title>iSales android</title>
</head>
<body></body>
</html>
</body>
</html>
Following is my java class that would get that i would add to java script as interface and it would receive the return value:
public class MyJS {
public void returnValue(String string){
Log.d(this.getClass().getSimpleName(), string);
}
}
And following is my activity class:
public class CheckWebView extends Activity {
private WebView webView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_check_web_view);
webView = (WebView) findViewById(R.id.webview);
webView.setWebChromeClient(new WebChromeClient() {
#Override
public void onConsoleMessage(String message, int lineNumber,
String sourceID) {
super.onConsoleMessage(message, lineNumber, sourceID);
Log.d(this.getClass().getCanonicalName(), "message " + message
+ " :::line number " + lineNumber + " :::source id "
+ sourceID);
}
#Override
public boolean onConsoleMessage(ConsoleMessage consoleMessage) {
// TODO Auto-generated method stub
onConsoleMessage(consoleMessage.message(),
consoleMessage.lineNumber(), consoleMessage.sourceId());
Log.d(this.getClass().getCanonicalName(), "message::::: "
+ consoleMessage.message());
return super.onConsoleMessage(consoleMessage);
}
});
webView.addJavascriptInterface(new MyJS(), "myjava");
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setPluginsEnabled(true);
webView.getSettings().setAllowFileAccess(true);
webView.loadUrl("file:///android_asset/test.html");
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_check_web_view, menu);
return true;
}
/* (non-Javadoc)
* #see android.app.Activity#onOptionsItemSelected(android.view.MenuItem)
*/
#Override
public boolean onOptionsItemSelected(MenuItem item) {
webView.loadUrl("javascript:fieldsOnDelete('name');");
return super.onOptionsItemSelected(item);
}
}
The key here is that there should be some time interval between the call to load html file from assets folder and the call to javascript:method. Here I am calling it from onOptionsItemSelected and it is working fine.. if I move the webView.loadUrl("javascript:fieldsOnDelete('name');"); to the end of the onCreate() method the it shows the error that it can not find fieldsOnDelete() method...
Hope it Helps...
EDIT3:
Replace following in your code
webView.loadUrl("javascript:alert(javascript:fieldsOnDelete())");
with
webView.loadUrl("javascript:alert(fieldsOnDelete())");
and try...

In Android KitKat there is a new method evaluateJavascript that has a callback for a return value. The callback returns a JSON value, object or array depending on what you return.
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
// In KitKat+ you should use the evaluateJavascript method
mWebView.evaluateJavascript(javascript, new ValueCallback<String>() {
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
#Override
public void onReceiveValue(String s) {
JsonReader reader = new JsonReader(new StringReader(s));
// Must set lenient to parse single values
reader.setLenient(true);
try {
if(reader.peek() != JsonToken.NULL) {
if(reader.peek() == JsonToken.STRING) {
String msg = reader.nextString();
if(msg != null) {
Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show();
}
}
}
} catch (IOException e) {
Log.e("TAG", "MainActivity: IOException", e);
} finally {
try {
reader.close();
} catch (IOException e) {
// NOOP
}
}
}
});
}
You can see a full example here: https://github.com/GoogleChrome/chromium-webview-samples/tree/master/jsinterface-example