Develop Reference

Android Navigation Drawer click Event Issue

I am creating a application which contains Navigation Drawer Activity. I am loading different Fragments in my main Screen. Now when I have to call Fragment at that time it works fine but when I want to call some sort of service like call, image picker at that time I added setNavigationItemSelectedListener which is works fine but all other fragments are not loading now.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
drawer = findViewById(R.id.drawer_layout);
NavigationView navigationView = findViewById(R.id.nav_view);
// Passing each menu ID as a set of Ids because each
// menu should be considered as top level destinations.
mAppBarConfiguration = new AppBarConfiguration.Builder(
R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow, R.id.nav_franchise,
R.id.nav_tieUP, R.id.nav_giftVoucher, R.id.nav_faq, R.id.nav_privacy_policy,
R.id.nav_tools, R.id.nav_send)
.setDrawerLayout(drawer)
.build();
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
NavigationUI.setupWithNavController(navigationView, navController);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem menuItem) {
int id = menuItem.getItemId();
if (id == R.id.callUs) {
Intent intent = new Intent(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:" + "XXXxxxXXX"));
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CALL_PHONE},REQUEST_PHONE_CALL);
}
else
{
startActivity(intent);
}
}
drawer.closeDrawer(GravityCompat.START);
return true;
}
});
}

When you call NavigationUI.setupWithNavController(navigationView, navController), you're saying that you want NavController to handle click events from your NavigationView, navigating to the related screen as per the NavigationUI documentation. This, by necessity, calls setNavigationItemSelectedListener() internally.
By calling setNavigationItemSelectedListener afterwards, you remove the original listener, which is why your other items don't do anything anymore. You can trigger the default behavior by calling NavigationUI.onNavDestinationSelected()
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem menuItem) {
int id = menuItem.getItemId();
if (id == R.id.callUs) {
Intent intent = new Intent(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:" + "XXXxxxXXX"));
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CALL_PHONE},REQUEST_PHONE_CALL);
}
else
{
startActivity(intent);
}
}
else
{
// Make your navController object final above
// or call Navigation.findNavController() again here
NavigationUI.onNavDestinationSelected(menuItem, navController);
}
drawer.closeDrawer(GravityCompat.START);
return true;
}

I tried to make a fragment and made a drawer here is my code:
import android.support.v4.app.FragmentManager;
import android.support.v4.app.Fragment;
import android.content.res.Configuration;
import android.support.design.widget.Snackbar;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v7.widget.Toolbar;
import android.support.design.widget.NavigationView;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
public class MainActivity extends AppCompatActivity implements View.OnClickListener, NavigationView.OnNavigationItemSelectedListener{
private Toolbar mToolBar;
private NavigationView mDrawer;
private ActionBarDrawerToggle mdrawerToggle;
private DrawerLayout mDrawerLayout;
private RelativeLayout digitalFrontier;
private RelativeLayout forwardThinkers;
private RelativeLayout preferedActions;
private LinearLayout innerParent;
public String viewVar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
digitalFrontier.setOnClickListener(this);
forwardThinkers.setOnClickListener(this);
preferedActions.setOnClickListener(this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mdrawerToggle.onConfigurationChanged(newConfig);
}
private void initViews(){
mToolBar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(mToolBar);
mDrawer = (NavigationView) findViewById(R.id.main_drawer);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_parent);
mdrawerToggle = new ActionBarDrawerToggle(
this,
mDrawerLayout,
mToolBar,
R.string.drawer_open,
R.string.drawer_close);
mDrawerLayout.setDrawerListener(mdrawerToggle);
// indicator based on whether the drawerlayout is in open or closed
mdrawerToggle.syncState();
digitalFrontier = (RelativeLayout) findViewById(R.id.digital_frontier);
forwardThinkers = (RelativeLayout) findViewById(R.id.forward_thinkers);
preferedActions = (RelativeLayout) findViewById(R.id.prefered_actions);
innerParent = (LinearLayout) findViewById(R.id.inner_parent);
mDrawer.setNavigationItemSelectedListener(this);
}
#Override
public void onClick(View v) {
if(v.getId() == R.id.digital_frontier || v.getId() == R.id.forward_thinkers ||
v.getId() == R.id.prefered_actions ){
detailActivity(v);
}
}
private void detailActivity(View view){
switch (view.getId()){
case R.id.digital_frontier:
viewVar = "digital frontier";
break;
case R.id.forward_thinkers:
viewVar = "forward thinkers";
break;
case R.id.prefered_actions:
viewVar = "prefered actions";
break;
}
Snackbar.make(mDrawerLayout, viewVar , Snackbar.LENGTH_LONG).show();
}
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
selectDrawerItem(menuItem);
return false;
}
public void selectDrawerItem(MenuItem menuItem) {
// Create a new fragment and specify the planet to show based on
// position
Fragment fragment = null;
Class fragmentClass = null;
switch(menuItem.getItemId()) {
case R.id.agency_menu_item:
fragmentClass = FragmentAgency.class;
break;
}
try {
fragment = (Fragment) fragmentClass.newInstance();
} catch (Exception e) {
e.printStackTrace();
}
// Insert the fragment by replacing any existing fragment
FragmentManager fragmentManager = this.getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.fragment_content,
fragment).commit();
// Highlight the selected item, update the title, and close the drawer
menuItem.setChecked(true);
setTitle(menuItem.getTitle());
//mDrawer.closeDrawers();
}

How to implement sign out function in the new navigation drawer in android studio?

I would like to implement the sign out method in my project. i watch all youtube tutorial but seems like the navigation drawer is the update version. and i'm clueless on how to implement those sign out coding into my coding.
the newest version of the navigation drawer already built in with the ui package folder. So i'm not quite sure on how to implement those tutorial code because most of the tutorial code have this code.
below is the tutorial code and i don't know on how to implement the sign out method into my home.java code. thank you
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_home) {
getSupportActionBar().setTitle("Home");
getSupportFragmentManager().beginTransaction().replace(R.id.container,new HomeFragment()).commit();
} else if (id == R.id.nav_profile) {
getSupportActionBar().setTitle("Profile");
getSupportFragmentManager().beginTransaction().replace(R.id.container,new ProfileFragment()).commit();
} else if (id == R.id.nav_settings) {
getSupportActionBar().setTitle("Settings");
getSupportFragmentManager().beginTransaction().replace(R.id.container,new SettingsFragment()).commit();
}
else if (id == R.id.nav_signout) {
FirebaseAuth.getInstance().signOut();
Intent loginActivity = new Intent(getApplicationContext(),LoginActivity.class);
startActivity(loginActivity);
finish();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
this is my home.java code
package com.example.guru;
import android.os.Bundle;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;
import android.view.View;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import com.google.android.material.navigation.NavigationView;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.view.Menu;
import android.widget.TextView;
public class Home extends AppCompatActivity {
FirebaseAuth firebaseAuth;
FirebaseUser currentUser;
DatabaseReference databaseReference;
private AppBarConfiguration mAppBarConfiguration;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//ini
firebaseAuth = FirebaseAuth.getInstance();
currentUser = firebaseAuth.getCurrentUser();
databaseReference = FirebaseDatabase.getInstance().getReference("Customer");
FloatingActionButton fab = findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = findViewById(R.id.drawer_layout);
NavigationView navigationView = findViewById(R.id.nav_view);
// Passing each menu ID as a set of Ids because each
// menu should be considered as top level destinations.
mAppBarConfiguration = new AppBarConfiguration.Builder(
R.id.nav_home, R.id.nav_profile, R.id.nav_orders,R.id.nav_logout)
.setDrawerLayout(drawer)
.build();
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
NavigationUI.setupWithNavController(navigationView, navController);
updateNavHeader();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.home, menu);
return true;
}
#Override
public boolean onSupportNavigateUp() {
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
return NavigationUI.navigateUp(navController, mAppBarConfiguration)
|| super.onSupportNavigateUp();
}
public void updateNavHeader() {
NavigationView navigationView = findViewById(R.id.nav_view);
View headerView= navigationView.getHeaderView(0);
TextView navName= headerView.findViewById(R.id.txtName);
TextView navEmail=headerView.findViewById(R.id.txtEmail);
navName.setText(currentUser.getDisplayName());
navEmail.setText(currentUser.getEmail());
}
}
LogoutFragment
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.Nullable;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProviders;
import com.example.guru.R;
public class LogoutFragment extends Fragment {
private LogoutViewModel logoutViewModel;
public View onCreateView(#NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
logoutViewModel =
ViewModelProviders.of(this).get(LogoutViewModel.class);
View root = inflater.inflate(R.layout.fragment_logout, container, false);
final TextView textView = root.findViewById(R.id.text_logout);
logoutViewModel.getText().observe(this, new Observer<String>() {
#Override
public void onChanged(#Nullable String s) {
textView.setText(s);
}
});
return root;
}
}
and this is my LogoutViewModel
package com.example.guru.ui.Logout;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;
public class LogoutViewModel extends ViewModel {
private MutableLiveData<String> mText;
public LogoutViewModel() {
mText = new MutableLiveData<>();
mText.setValue("logout");
}
public LiveData<String> getText() {
return mText;
}
}

Feels like there should be a built in solution but so far I have solved it like this.
I simply add a click listener on that menu option, in my case my logout button:
In Java -->
NavigationView navigationView = findViewById(R.id.nav_view);
navigationView.getMenu().findItem(R.id.logout).setOnMenuItemClickListener(menuItem -> {
logout();
return true;
});
In Kotlin -->
navView.getMenu().findItem(R.id.nav_logout).setOnMenuItemClickListener({ menuItem ->
logoutDialog()
true
})

I found two solution to handle it.
1. If you have register your fragment in navigation graph than
navController.addOnDestinationChangedListener(new NavController.OnDestinationChangedListener() {
#Override
public void onDestinationChanged(#NonNull NavController controller, #NonNull NavDestination destination, #Nullable Bundle arguments) {
if (destination.getId() == R.id.logout){
logout();
}
}
});
2. If you don't have register fragment in navigation graph and you just want to handle click event on drawer menu.
mNavigationView.getMenu().findItem(R.id.nav_logout).setOnMenuItemClickListener(menuItem -> {
AppUtils.showLongToast("this works", getApplicationContext());
return true;
});

my navigation menu code
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:showIn="navigation_view">
<item
android:id="#+id/nav_share"
android:icon="#drawable/ic_menu_share"
android:title="#string/menu_share" />
<item
android:id="#+id/logout"
android:icon="#drawable/logout"
android:title="Logout" />
<item
android:id="#+id/login"
android:icon="#drawable/logout"
android:title="Login" />
</menu>
code inside onResume method , this will hide either sign out or sign in button depending upon auth state of user
#Override
protected void onResume() {
super.onResume();
if (auth.getCurrentUser() == null) {
navigationView.getMenu().findItem(R.id.logout).setVisible(false);
navigationView.getMenu().findItem(R.id.login).setVisible(true);
// perform action when user is not logged in
} else {
navigationView.getMenu().findItem(R.id.logout).setVisible(true);
navigationView.getMenu().findItem(R.id.login).setVisible(false);
// perform action when user is already logged in
}
}
Handle navigation view item clicks here.
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.logout) {
auth.signOut();
onResume();
} else if (id == R.id.login) {
//handle event login button pressed
startActivity(new Intent(MainActivity.this, LoginActivity.class));
}
DrawerLayout drawer = findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
Hope this will help you

I solve it with the help of constraint layout

Google maps custom marker not loading the firebase images

I am developing an Android Studio app using Java. My app allows a user to sign in and view custom markers on a map with custom markers. When a user click on a custom marker they get taken to another activity.
My problem is, When accessing this activity via the custom marker, the app does not load the images stored in firebase.
Any Suggestions on what the problem might be? Thanks.
map activity that deals with the markers:
mMap.setOnMarkerClickListener
(new GoogleMap.OnMarkerClickListener() {
#Override
public boolean onMarkerClick(Marker marker) {
if (marker.getTitle().equals("Mario's Italian"))
startActivity(new Intent(MapView.this,
ItalianMenu.class));
if (marker.getTitle().equals("Bamboo Tandoori"))
startActivity(new Intent(MapView.this,
IndianMenu.class));
if (marker.getTitle().equals("King Chinese
Takeaway"))
startActivity(new Intent(MapView.this,
ChineseMenu.class));
return false;
}
});
activity that opens up when a user clicks the marker:
package myapp.zerbu.partyloader;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.squareup.picasso.Picasso;
import myapp.zerbu.partyloader.Common.Common;
import myapp.zerbu.partyloader.Interface.ItemClickListener;
import myapp.zerbu.partyloader.Model.Category;
import myapp.zerbu.partyloader.ViewHolder.MenuViewHolder;
public class ItalianMenu extends AppCompatActivity
implements
NavigationView.OnNavigationItemSelectedListener {
FirebaseDatabase database;
DatabaseReference category;
TextView txtName;
RecyclerView recycler_menu;
RecyclerView.LayoutManager layoutManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setTitle("Mario's Italian");
setSupportActionBar(toolbar);
//Init Firebase
database = FirebaseDatabase.getInstance();
category = database.getReference("Category");
//Basket
FloatingActionButton fab = (FloatingActionButton)
findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own
action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = (DrawerLayout)
findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new
ActionBarDrawerToggle(
this, drawer, toolbar,
R.string.navigation_drawer_open,
R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView)
findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
//Set Name for user
View headerView = navigationView.getHeaderView(0);
txtName =
(TextView)headerView.findViewById(R.id.txtName);
txtName.setText(Common.currentUser.getName());
//Load menu
recycler_menu = (RecyclerView)
findViewById(R.id.recycler_menu);
recycler_menu.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
recycler_menu.setLayoutManager(layoutManager);
loadMenu();
}
private void loadMenu() {
FirebaseRecyclerAdapter<Category, MenuViewHolder>
adapter = new FirebaseRecyclerAdapter<Category,
MenuViewHolder>(Category.class,
R.layout.activity_italian_menu, MenuViewHolder.class,
category) {
#Override
protected void populateViewHolder(MenuViewHolder
viewHolder, Category model, int position) {
viewHolder.txtMenuName.setText(model.getName());
Picasso.with(getBaseContext()).load(model.getImage())
.into(viewHolder.imageView);
final Category clickItem = model;
viewHolder.setImageClickListener(new
ItemClickListener() {
#Override
public void onClick(View view, int position,
boolean isLongClick) {
Toast.makeText(ItalianMenu.this,
""+clickItem.getName(), Toast.LENGTH_SHORT).show();
}
});
}
};
recycler_menu.setAdapter(adapter);
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout)
findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar
if it is present.
getMenuInflater().inflate(R.menu.home, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_restaurants) {
// Handle the camera action
} else if (id == R.id.nav_basket) {
} else if (id == R.id.nav_orders) {
} else if (id == R.id.nav_logout) {
}
DrawerLayout drawer = (DrawerLayout)
findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}

Reading and writing from and to a JSON file

In Android, I have 2 activities. Mainactivity takes input from 2 edittext (USERNAME-PASSWORD) and writes them to file.json located in asset folder , Output activity has 2 textview , which will read the values (USERNAME-PASSWORD)from file.json and set the text to TextView. This is how far I tried.
MainActivity.java
package com.example.io;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;
import android.view.View;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.databind.*;
import com.google.android.material.navigation.NavigationView;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.EditText;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.InputStreamReader;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener
{
private EditText et1,et2;
private Button b;
String e1,e2;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
et1 = (EditText) findViewById(R.id.et1);
et2 = (EditText) findViewById(R.id.et2);
b = (Button) findViewById(R.id.b);
e1=et1.getText().toString().trim();
e2=et2.getText().toString().trim();
b.setOnClickListener(new View.OnClickListener()
{
BufferedReader reader = null;
DataOutputStream dos = null;
BufferedWriter writer = null;
#Override
public void onClick(View v)
{
//ObjectMapper mapper = new ObjectMapper();
try
{
JSONObject jsonObject = new JSONObject();
jsonObject.put("id",et1);
jsonObject.put("password",et2);
String FILENAME = "file.json";
String string = jsonObject.toString();
FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
fos.write(string.getBytes());
fos.close();
Intent intent = new Intent(MainActivity.this,Output.class);
startActivity(intent);
}
catch (Exception e)
{
e.printStackTrace();
System.out.println(e.getMessage());
}
}
});
}
#Override
public void onBackPressed()
{
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START))
{
drawer.closeDrawer(GravityCompat.START);
}
else
{
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings)
{
return true;
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item)
{
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_input)
{
// Handle the camera action
}
else if (id == R.id.nav_output)
{
Intent intent = new Intent(MainActivity.this,Output.class);
startActivity(intent);
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
Output.java
package com.example.io;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import com.google.android.material.navigation.NavigationView;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import org.json.JSONArray;
import org.json.JSONObject;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import org.json.simple.parser.JSONParser;
public class Output extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener
{
private TextView tv1;
private TextView tv2;
String id,password;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_output);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
tv1 = findViewById(R.id.tv1);
tv2 = findViewById(R.id.tv2);
String json = null;
try
{
/*JSONParser jsonParser = new JSONParser();
JSONArray jsonArray = (JSONArray) jsonParser.parse(new FileReader("C:\\Users\\I\\Desktop\\IO\\app\\src\\main\\assets\\file.json"));
JSONObject jsonObject = jsonArray.getJSONObject(0);
Functions functions = new Functions();
Bundle bundle = functions.MakeBundleFromJSON(jsonObject);*/
/*InputStream is = Output.this.getAssets().open("file.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String(buffer, "UTF-8");*/
InputStream is = getAssets().open("file.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String(buffer, "UTF-8");
System.out.println(json);
JSONObject obj = new JSONObject(json);
tv1.setText(obj.getString("id"));
tv2.setText(obj.getString("password"));
}
catch (Exception e)
{
e.printStackTrace();
System.out.println(e.getMessage());
}
}
#Override
public void onBackPressed()
{
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START))
{
drawer.closeDrawer(GravityCompat.START);
}
else
{
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.output, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings)
{
return true;
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item)
{
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_input)
{
// Handle the camera action
Intent intent = new Intent(Output.this,MainActivity.class);
startActivity(intent);
}
else if (id == R.id.nav_output)
{
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
My problem is I can't see any output in Output activity.
here is log
If u need a closer look see here in git

You can store the data in Shared Preference from your activity and the data will still persists when your application is closed.
You can visit the below link to Android developers official website
Shared Preference
Hope it helps.

I am Converting an Website into app and the links are not opening within app . Android Studio

I am Converting an Website into app and the links are not opening within app . I make many changes but nothing is happening . So Can you please please help me . How to solve . I want all the links open with in app and My Youtube videos in my Website also Does n't opening in full screen.
Thanks in advance
Main Activity Code --
package com.mywebsite.fun;
import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.KeyEvent;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import java.net.URI;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
//initializing WebView
private WebView mwebView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
//WebView
mwebView = (WebView) findViewById(R.id.myWebView);
WebSettings webSettings = mwebView.getSettings();
webSettings.setJavaScriptEnabled(true);
//improve webView performance
mwebView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
mwebView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
mwebView.getSettings().setAppCacheEnabled(true);
mwebView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
webSettings.setDomStorageEnabled(true);
webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);
webSettings.setUseWideViewPort(true);
webSettings.setSavePassword(true);
webSettings.setSaveFormData(true);
webSettings.setEnableSmoothTransition(true);
mwebView.loadUrl("https://laughonlyblog.wordpress.com/about/");
//force links open in webview only
mwebView.setWebViewClient(new MyWebviewClient());
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
mwebView.loadUrl("http://www.newsweek.com/us");
} else if (id == R.id.nav_slideshow) {
mwebView.loadUrl("http://www.newsweek.com/world");
} else if (id == R.id.nav_manage) {
mwebView.loadUrl("http://www.newsweek.com/tech-science");
} else if (id == R.id.nav_gallery) {
mwebView.loadUrl("http://www.newsweek.com/sports");
} else if (id == R.id.nav_share) {
mwebView.loadUrl("http://www.newsweek.com/about-newsweek");
} else if (id == R.id.nav_send) {
mwebView.loadUrl("http://www.newsweek.com/contact");
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
private class MyWebviewClient extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (Uri.parse(url).getHost().equals("www.laughonlyblog.wordpress.com/about/")) {
//open url contents in webview
return false;
} else {
//here open external links in external browser or app
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(intent);
return true;
}
}
//ProgressDialogue
ProgressDialog pd = null;
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
pd=new ProgressDialog(MainActivity.this);
pd.setTitle("Please Wait..");
pd.setMessage("Website is Loading..");
pd.show();
super.onPageStarted(view, url, favicon);
}
#Override
public void onPageFinished(WebView view, String url) {
pd.dismiss();
super.onPageFinished(view, url);
}
}
//goto previous page when pressing back button
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
if (mwebView.canGoBack()) {
mwebView.goBack();
} else {
finish();
}
return true;
}
}
return super.onKeyDown(keyCode, event);
}
}
Manifest Code---
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mywebsite.fun">
<uses-permission android:name="android.permission.INTERNET" />
android:hardwareAccelerated="true"
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

Try to comment your these lines inside method 'shouldOverrideUrlLoading' in inner class of MyWebviewClient :
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
/* if (Uri.parse(url).getHost().equals("www.laughonlyblog.wordpress.com/about/")) {
//open url contents in webview
return false;
} else {
//here open external links in external browser or app
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(intent);
} */
return true;
}