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Why web view refresh in android after camera close?

I am opening a URL in webview .there is input field initial value is blank .and a button in my application.on button click I am opening my camera and capture image and back to my web view to show the image.
Issue is
Initially, the input field is blank .now I type “abc” in the input field when I click the button to capture an image.The image is shown but web view is reloaded and my input field become blank again why ?? It should persist in his state.
package com.example.myapp.myapplication;
import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Base64;
import android.util.Log;
import android.webkit.JavascriptInterface;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.widget.Toast;
import java.io.ByteArrayOutputStream;
public class MainActivity extends AppCompatActivity {
private static final int CAMERA_REQUEST = 1888;
private static final int MY_CAMERA_PERMISSION_CODE = 100;
WebView webView;
public static Bitmap photo;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView) findViewById(R.id.webview);
webView.loadUrl("http://100.50.100.97:32671");
// webView.loadUrl("http://115.10.74.180:30019");
JavaScriptInterface jsInterface = new JavaScriptInterface(this);
webView.getSettings().setJavaScriptEnabled(true);
webView.setWebChromeClient(new WebChromeClient());
webView.addJavascriptInterface(jsInterface, "JSInterface");
}
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == MY_CAMERA_PERMISSION_CODE) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(this, "camera permission granted", Toast.LENGTH_LONG).show();
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
} else {
Toast.makeText(this, "camera permission denied", Toast.LENGTH_LONG).show();
}
}
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_REQUEST && resultCode == Activity.RESULT_OK) {
photo = (Bitmap) data.getExtras().get("data");
// Log.d("My map",photo,"");
if (webView != null) {
// webView.loadUrl("http://100.50.100.97:32671");
webView.loadUrl("http://115.10.74.180:30019");
}
}
}
public void checkTest(){
if (checkSelfPermission(Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.CAMERA}, MY_CAMERA_PERMISSION_CODE);
} else {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
}
}
}
class JavaScriptInterface {
private MainActivity activity;
public JavaScriptInterface(MainActivity activity) {
this.activity = activity;
}
#JavascriptInterface
public void test() {
this.activity.checkTest();
}
#JavascriptInterface
public String bitMapToBase64()
{
if (MainActivity.photo != null) {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
//add support for jpg and more.
MainActivity.photo.compress(Bitmap.CompressFormat.PNG, 50, byteArrayOutputStream);
byte[] byteArray = byteArrayOutputStream .toByteArray();
String encoded = Base64.encodeToString(byteArray, Base64.DEFAULT);
return encoded;
}
return "null image";
}
}
the issue is on this line
if (requestCode == CAMERA_REQUEST && resultCode == Activity.RESULT_OK) {
photo = (Bitmap) data.getExtras().get("data");
// Log.d("My map",photo,"");
if (webView != null) {
// webView.loadUrl("http://100.50.100.97:32671");
webView.loadUrl("http://115.10.74.180:30019");
}
}
}
why whole content is refreshed?

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();
}
}

Adding onClick to RecyclerView after parsing JSON data

I have a fragment in which reside a RecyclerView. I parsed JSON data from a webpage and showed it in this RecyclerView using tutorial: https://www.learn2crack.com/2016/02/recyclerview-json-parsing.html
Now I wish to add an onClick to the RecyclerView items. I know how to do so for static RecyclerView items but don't know to setOnClickListener in this case. For static recyclerview items, I'm using this class for onClick events.
package com.parassidhu.cdlumaths;
import android.support.v7.widget.RecyclerView;
import android.view.View;
public class ItemClickSupport {
private final RecyclerView mRecyclerView;
private OnItemClickListener mOnItemClickListener;
private OnItemLongClickListener mOnItemLongClickListener;
private View.OnClickListener mOnClickListener = new View.OnClickListener() {
#Override
public void onClick(View v) {
if (mOnItemClickListener != null) {
RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
mOnItemClickListener.onItemClicked(mRecyclerView, holder.getAdapterPosition(), v);
}
}
};
private View.OnLongClickListener mOnLongClickListener = new View.OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
if (mOnItemLongClickListener != null) {
RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
return mOnItemLongClickListener.onItemLongClicked(mRecyclerView, holder.getAdapterPosition(), v);
}
return false;
}
};
private RecyclerView.OnChildAttachStateChangeListener mAttachListener
= new RecyclerView.OnChildAttachStateChangeListener() {
#Override
public void onChildViewAttachedToWindow(View view) {
if (mOnItemClickListener != null) {
view.setOnClickListener(mOnClickListener);
}
if (mOnItemLongClickListener != null) {
view.setOnLongClickListener(mOnLongClickListener);
}
}
#Override
public void onChildViewDetachedFromWindow(View view) {
}
};
private ItemClickSupport(RecyclerView recyclerView) {
mRecyclerView = recyclerView;
mRecyclerView.setTag(R.id.item_click_support, this);
mRecyclerView.addOnChildAttachStateChangeListener(mAttachListener);
}
public static ItemClickSupport addTo(RecyclerView view) {
ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support);
if (support == null) {
support = new ItemClickSupport(view);
}
return support;
}
public static ItemClickSupport removeFrom(RecyclerView view) {
ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support);
if (support != null) {
support.detach(view);
}
return support;
}
public ItemClickSupport setOnItemClickListener(OnItemClickListener listener) {
mOnItemClickListener = listener;
return this;
}
public ItemClickSupport setOnItemLongClickListener(OnItemLongClickListener listener) {
mOnItemLongClickListener = listener;
return this;
}
private void detach(RecyclerView view) {
view.removeOnChildAttachStateChangeListener(mAttachListener);
view.setTag(R.id.item_click_support, null);
}
public interface OnItemClickListener {
void onItemClicked(RecyclerView recyclerView, int position, View v);
}
public interface OnItemLongClickListener {
boolean onItemLongClicked(RecyclerView recyclerView, int position, View v);
}
}
My Adapter Class is:
package com.parassidhu.cdlumaths;
import android.content.ClipData;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import com.parassidhu.cdlumaths.R;
import com.parassidhu.cdlumaths.Android;
import java.util.ArrayList;
public class NoticesData extends RecyclerView.Adapter<NoticesData.ViewHolder> {
private ArrayList<Android> mAndroidList;
private RecyclerView recyclerView;
public NoticesData(ArrayList<Android> androidList, RecyclerView rcl) {
mAndroidList = androidList;
recyclerView=rcl;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.notices_row, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(final ViewHolder holder, int position) {
holder.mTvName.setText(mAndroidList.get(position).getName());
ItemClickSupport.addTo(recyclerView).setOnItemClickListener(new ItemClickSupport.OnItemClickListener() {
#Override
public void onItemClicked(RecyclerView recyclerView, int position, View v) {
//I can't call Toast or startIntent here
}
});
}
#Override
public int getItemCount() {
return mAndroidList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
private TextView mTvName;
public ViewHolder(View view) {
super(view);
mTvName = (TextView)view.findViewById(R.id.tv_name);
}
}
}

In your Activity or Fragment class create a method like below
public void showToast(int position) {
Toast.makeText(getActivity(), "Clicked position is " + position, Toast.LENGTH_SHORT).show();
}
(I think you're using Fragment so I used getActivity())
Now update your Adapter constructor like this
...
...
private YourFragment frag;
public NoticesData(ArrayList<Android> androidList, RecyclerView rcl, YourFragment fragment) {
mAndroidList = androidList;
recyclerView = rcl;
frag = fragment;
}
In your Fragment update Adapter initialization like this
NoticesData notice = NoticesData(androidList, rcl, YourFragment.this);
Now call the showToast() method like below in Adapter
ItemClickSupport.addTo(recyclerView).setOnItemClickListener(new ItemClickSupport.OnItemClickListener() {
#Override
public void onItemClicked(RecyclerView recyclerView, int position, View v) {
frag.showToast(position); // it's like callback method
}
});
Note: here YourFragment means the Fragment which hosts your RecyclerView.

you must set click listener for each of the items in your recycler view from the adapter for that recycler view. when you set the data for each if the items (views) in the recycler view you can add the onClickListener for that view too.

Webview Fragment : Back button and Download Listener?

I make simple webview app. using Webview fragment. App working properly. but problem is i click back button app close down. and second problem is i click on html page link. link not open in default browser. error says webpage not open. i want all tab open in same webview and back button and download link work properly. my code is
MyWebViewFragment.java
package com.example.com;
import android.app.Fragment;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MyWebViewFragment extends Fragment {
ProgressDialog mProgress;
WebView webview;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.web_fragment, container,
false);
Bundle bundle = getArguments();
String url = bundle.getString("url");
webview = (WebView) rootView.findViewById(R.id.webview1);
WebSettings settings = webview.getSettings();
settings.setJavaScriptEnabled(true);
mProgress = ProgressDialog.show(getActivity(), "Loading",
"Please wait for a moment...");
webview.loadUrl(url);
webview.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
if (mProgress.isShowing()) {
mProgress.dismiss();
}
}
});
return rootView;
}
}
MainActivity.java
package com.example.com;
import java.util.ArrayList;
import java.util.List;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
public class MainActivity extends Activity {
String[] menutitles;
TypedArray menuIcons;
String[] pageUrl;
// nav drawer title
private CharSequence mDrawerTitle;
private CharSequence mTitle;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private List<RowItem> rowItems;
private CustomAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
menutitles = getResources().getStringArray(R.array.titles);
menuIcons = getResources().obtainTypedArray(R.array.icons);
pageUrl = getResources().getStringArray(R.array.pageurl);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.slider_list);
rowItems = new ArrayList<RowItem>();
for (int i = 0; i < menutitles.length; i++) {
RowItem items = new RowItem(menutitles[i], menuIcons.getResourceId(
i, -1), pageUrl[i]);
rowItems.add(items);
}
menuIcons.recycle();
adapter = new CustomAdapter(getApplicationContext(), rowItems);
mDrawerList.setAdapter(adapter);
mDrawerList.setOnItemClickListener(new SlideitemListener());
// enabling action bar app icon and behaving it as toggle button
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, R.string.app_name,
R.string.app_name) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
// on first time display view for first nav item
updateDisplay(0);
}
}
class SlideitemListener implements ListView.OnItemClickListener {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
updateDisplay(position);
}
}
private void updateDisplay(int position) {
String url = rowItems.get(position).getPageUrl();
Fragment fragment = new MyWebViewFragment();
Bundle bundle = new Bundle();
bundle.putString("url", url);
fragment.setArguments(bundle);
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit();
setTitle(menutitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
#Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/***
* Called when invalidateOptionsMenu() is triggered
*/
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggles
mDrawerToggle.onConfigurationChanged(newConfig);
}
}

To open urls in webview use the code
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView) findViewById(R.id.webView);
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setPluginState(WebSettings.PluginState.OFF);
webSettings.setSupportMultipleWindows(true);
webSettings.setBuiltInZoomControls(true);
webSettings.setAppCacheMaxSize(1);
webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE);
webSettings.setAppCacheEnabled(false);
// webView.setVerticalScrollBarEnabled(false);
// webView.setHorizontalScrollBarEnabled(false);
webView.setWebChromeClient(new WebChromeClient());
webView.clearCache(true);
// webView.setInitialScale(100);
// webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
webView.setBackgroundColor(0);
webView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
Log.e("", "shouldOverrideUrlLoading load url" + url);
return false;
}
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
super.onReceivedError(view, errorCode, description, failingUrl);
isLoaded = false;
progressDialog.setMessage("Unknown Error!");
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
public void run() {
try {
progressDialog.dismiss();
} catch (Exception e) {
}
}
}, 1500);
}
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
displayProgress(getString(R.string.loading), getString(R.string.loading));
Log.e("onPageStarted",url);
}
public void onPageFinished(WebView view, String url) {
isLoaded = true;
super.onPageFinished(view, url);
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
public void run() {
try {
progressDialog.dismiss();
} catch (Exception e) {
}
}
}, 1500);
}
});
web_link = "https://twitter.com";
webView.loadUrl(web_link);
}
public void displayProgress(String title,String mes){
if (progressDialog!=null)
progressDialog.dismiss();
progressDialog = new ProgressDialog(MainActivity.this);
// progressDialog.setTitle(title);
progressDialog.setMessage(mes);
progressDialog.setIndeterminate(false);
progressDialog.setCancelable(true);
try {
progressDialog.show();
} catch (Exception e) {
e.printStackTrace();
}
}
To go back on web view override this method to your activity
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (web_link!=null && !webView.getUrl().equals(web_link))
webView.goBack();
else{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(R.string.to_exit)
.setCancelable(false)
.setPositiveButton(getString(android.R.string.yes), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
MainActivity.this.finish();
}
})
.setNegativeButton(getString(android.R.string.no), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
return super.onKeyDown(keyCode, event);
}

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...