Develop Reference

How can I open another activity with specific fragment with Navigation Component?

I am using two Activities. One is MainActivity and the second one is for NFC. MainActivity has nav_graph.xml.
After reading the NFC, I'd like to start MainActivity and move to a certain fragment of MainActivity.
How can I implement this?

You can try this:
(in MainActivity.java)
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch(position) {
case 0:
Frag1 frag1 = new Frag1();//this is one activity
return frag1;
case 1:
Frag2 frag2 = new Frag2();
return frag2;
default:
return null;
}
}
#Override
public int getCount() {
return 2; //'the number 2 is 'cause you've got a two activities
}
}
and if you want open another activity with de floating action button, you can try this:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
FloatingActionButton fab = (FloatingActionButton)findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(mViewPager.getCurrentItem()==0){
Fragment1();
Toast.makeText(MainActivity.this, "Example 1", Toast.LENGTH_SHORT).show();
}else if(mViewPager.getCurrentItem()==1){
Fragmen2();
Toast.makeText(MainActivity.this, "Example 2", Toast.LENGTH_SHORT).show();
}
}
});
mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mViewPager));
}
public void Fragment1(){//Call to the activity Example1
Intent fragment0 = new Intent(getApplicationContext(), example1.class);
startActivity(fragment0);
onResume();
}
public void Fragmen2(){ //Call to the activity Example2
Intent fragment1 = new Intent(getApplicationContext(), example2.class);
startActivity(fragment1);
onResume();
}

Tabs in Android disappears. Code was working before but now it stopped working

I have used Tab Control and RecyclerView together in Android. The way it functions is I have SearchBar in the toolbar. When the user enters the search query in the search bar. Upon hitting the search button, tab's Fragments are supposed to be loaded with data. Issues are as follows.
1) Tabs icon disappear
2) When debugging through the code found (Since I am using ViewPager with Tab Layout to implement Tabs in android) that getItem method of PagerAdapter class is called twice every time getItem is triggered.
I am stuck and don't know what to do. Not much help online as well.
1) Tab initialization Code:-
private TabLayout tabLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tabLayout = (TabLayout)findViewById(R.id.tablayout);
tabLayout.addTab(tabLayout.newTab().setIcon(R.mipmap.craigslist_new1));
tabLayout.addTab(tabLayout.newTab().setIcon(R.mipmap.kijiji_new1));
tabLayout.addTab(tabLayout.newTab().setIcon(R.mipmap.letgo_new1));
tabLayout.addTab(tabLayout.newTab().setIcon(R.mipmap.varagesale_new1));
tabLayout.addTab(tabLayout.newTab().setIcon(R.mipmap.facebook_new1));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
drawerLayout = findViewById(R.id.drawer_layout);
}
#Override
public boolean onQueryTextSubmit(String query) {
//loadRecyclerViewData(query);
Bundle bundle = new Bundle();
bundle.putString("searchText", query);
final ViewPager viewPager = (ViewPager)findViewById(R.id.pager);
final PageAdapter adapter = new PageAdapter(getSupportFragmentManager(), tabLayout.getTabCount(), bundle);
viewPager.setAdapter(adapter);
viewPager.setOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setupWithViewPager(viewPager);
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
return true;
}
2) PagerAdapter:-
public class PageAdapter extends FragmentStatePagerAdapter {
int mNoofTabs;
Bundle bundle;
public PageAdapter(FragmentManager fragmentManager, int NumberOfTabs, Bundle bundle)
{
super(fragmentManager);
this.mNoofTabs = NumberOfTabs;
this.bundle = bundle;
}
#Override
public Fragment getItem(int i) {
switch(i)
{
case 0 :
CraigslistFragment tab1 = new CraigslistFragment();
tab1.setArguments(bundle);
return tab1;
case 1:
KijijiFragment tab2 = new KijijiFragment();
tab2.setArguments(bundle);
return tab2;
case 2:
letgoFragment tab3 = new letgoFragment();
tab3.setArguments(bundle);
return tab3;
case 3:
VaragesaleFragment tab4 = new VaragesaleFragment();
tab4.setArguments(bundle);
return tab4;
case 4:
FacebookFragment tab5 = new FacebookFragment();
tab5.setArguments(bundle);
return tab5;
default:
return null;
}
}
#Override
public int getCount() {
return mNoofTabs;
}
}

Getting the number of the Current Tab in Tabbed Activity

First of all I am new to Android development, and I would appreciate your help.
I have a tabbed activity in android studio and I have a FloatingActionButton to add an Item in each fragment of the tabbed activity. This button then calls a new Activty and I would like to pass to the new activity the tab Number, so that I can store it in a database.
How can I get the tab Number that the new activity was generated from?
Below is the code:
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_portal);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
mViewPager.addOnPageChangeListener(new
TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new
TabLayout.ViewPagerOnTabSelectedListener(mViewPager));
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent startNewPostActivity = new Intent(getApplicationContext(), NewPostActivity.class);
startNewPostActivity.putExtra("Fragment_Position", position_fragment);
startActivity(startNewPostActivity);
}
});
}
To get the position I was doing the following :
Setting position_fragment = position;
however this returns wrong tab Number.
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
position_fragment = position; // not good
return PlaceholderFragment.newInstance(position);
}
#Override
public int getCount() {
// Show 5 total pages.
return 5;
}
}
}

Try this:
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent startNewPostActivity = new Intent(getApplicationContext(), NewPostActivity.class);
startNewPostActivity.putExtra("Fragment_Position", mViewPager.getCurrentItem());
startActivity(startNewPostActivity);
}
});

You can identify your tab id from these switch case and call necessary function inside
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());//setting current selected item over viewpager
switch (tab.getPosition()) {
case 0:
//Log.e("TAG","TAB1");
break;
case 1:
//Log.e("TAG","TAB2");
break;
case 2:
//Log.e("TAG","TAB3");
break;
case 3:
//Log.e("TAG","TAB4");
break;
case 4:
//Log.e("TAG","TAB5");
break;
case 5:
//Log.e("TAG","TAB6");
break;
case 6:
//Log.e("TAG","TAB7");
break;
}
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});

There are two ways to get number of the Current Tab in Tabbed Activity
1. use ViewPager.getCurrentItem()
Returns the number of pages that will be retained to either side of the current page in the view hierarchy in an idle state. Defaults to 1.
SAMPLE CODE
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent startNewPostActivity = new Intent(getApplicationContext(), NewPostActivity.class);
startNewPostActivity.putExtra("Fragment_Position", mViewPager.getCurrentItem());
startActivity(startNewPostActivity);
}
2. Use TabLayout.addOnTabSelectedListener()
Add a TabLayout.OnTabSelectedListener that will be invoked when tab selection changes.
SAMPLE CODE
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
int position = tab.getPosition();
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});

Hide navigation drawer and tabs when loading the webview in android fragment

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
// Remove the below line after defining your own ad unit ID.
/* private static final String TOAST_TEXT = "Test ads are being shown. "
+ "To show live ads, replace the ad unit ID in res/values/strings.xml with your own ad unit ID.";*/
boolean doubleBackToExitPressedOnce = false;
//set viewpager adapter
ViewPagerAdapter pagerAdapter;
private ViewPager viewPager;
private DrawerLayout drawer;
private TabLayout tabLayout;
private String[] pageTitle = {"Home","Movies","Songs", "Comedy"};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
// Load an ad into the AdMob banner view.
AdView adView = (AdView) findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder()
.setRequestAgent("android_studio:ad_template").build();
adView.loadAd(adRequest);
// Toasts the test ad message on the screen. Remove this after defining your own ad unit ID.
// Toast.makeText(this, TOAST_TEXT, Toast.LENGTH_LONG).show();
viewPager = (ViewPager) findViewById(R.id.view_pager);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
drawer = (DrawerLayout) findViewById(R.id.drawerLayout);
setSupportActionBar(toolbar);
//create default navigation drawer toggle
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar,
R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
//setting Tab layout (number of Tabs = number of ViewPager pages)
tabLayout = (TabLayout) findViewById(R.id.tab_layout);
for (int i = 0; i < 4; i++) {
tabLayout.addTab(tabLayout.newTab().setText(pageTitle[i]));
}
//set gravity for tab bar
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
//handling navigation view item event
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
assert navigationView != null;
navigationView.setNavigationItemSelectedListener(this);
//set viewpager adapter
pagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(pagerAdapter);
//change Tab selection when swipe ViewPager
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
//change ViewPager page when tab selected
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.movies:
viewPager.setCurrentItem(0);
break;
case R.id.comedy:
viewPager.setCurrentItem(1);
break;
case R.id.songs:
viewPager.setCurrentItem(2);
break;
case R.id.animation:
Intent in = new Intent(this, Animation.class);
// intent.putExtra("string", "");
startActivity(in);
break;
case R.id.albums:
Intent intent = new Intent(this, DesActivity.class);
// intent.putExtra("string", "");
startActivity(intent);
break;
}
drawer.closeDrawer(GravityCompat.START);
return true;
}
#Override
public void onBackPressed() {
int position = viewPager.getCurrentItem();
Fragment fragment = pagerAdapter.getItem(position);
if (fragment != null) {
switch (position) {
case 0:
if (((Home) fragment).hasBackPage()) return;
break;
case 1:
if (((MoviesActivity) fragment).hasBackPage()) return;
break;
case 2:
if (((SongsActivity) fragment).hasBackPage()) return;
break;
case 3:
if (((ComedyActivity) fragment).hasBackPage()) return;
break;
}
if (position == 0) {
if (doubleBackToExitPressedOnce) {
super.onBackPressed();
finish();
return;
}
this.doubleBackToExitPressedOnce = true;
Toast.makeText(this, "Touch again to Exit", Toast.LENGTH_SHORT).show();
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
doubleBackToExitPressedOnce = false;
}
}, 2000);
} else {
viewPager.setCurrentItem(0);
}
}
}
}

Initially hide both TabLayout and NavigationDrawer and show when WebView loaded by using below code
mWebView.setWebViewClient(new WebViewClient() {
#Override
public void onPageFinished(WebView view, String url) {
showViews();
}
});

Not able to call TablayoutActivity from AppcombatActivity

I want to call my tablayout activity , when user clicked on Item Menu from Action View Item ,
But I am getting error :
06-15 14:17:01.604: E/AndroidRuntime(1365): java.lang.NoClassDefFoundError: Failed resolution of: Linfo/muscle/reboot/activity/Wrk_plan_gain;
Here is my Main activity from where I am calling Tab layout Activity .
MainActivity:
public class MainActivity extends AppCompatActivity implements FragmentDrawer.FragmentDrawerListener {
public MainActivity() {
// Required empty public constructor
}
private static String TAG = MainActivity.class.getSimpleName();
private Toolbar mToolbar;
private FragmentDrawer drawerFragment;
SharedPreferences pref;
String diet_saved;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pref = this.getPreferences(1);
diet_saved=pref.getString("diettype", "main");
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
drawerFragment = (FragmentDrawer)
getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar);
drawerFragment.setDrawerListener(this);
// display the first navigation drawer view on app launch
displayView(0);
}
#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.workout_menu) {
startActivity(new Intent(MainActivity.this, Wrk_plan_gain.class));
finish();
return true;
}
/*if(id == R.id.action_search){
Toast.makeText(getApplicationContext(), "Search action is selected!", Toast.LENGTH_SHORT).show();
return true;
}
*/
return super.onOptionsItemSelected(item);
}
#Override
public void onDrawerItemSelected(View view, int position) {
displayView(position);
}
private void displayView(int position) {
Fragment fragment = null;
String title = getString(R.string.app_name);
switch (position) {
case 0:
fragment = new HomeFragment();
title = getString(R.string.title_home);
break;
case 1:
fragment = new KnowYourBodyFragment();
title = getString(R.string.title_friends);
break;
case 2:
fragment = new YourResultFragment();
title = getString(R.string.title_messages);
break;
case 3:
fragment = new YourMacroResultFragment();
title = getString(R.string.title_macro);
break;
case 4:
fragment = new DietPlanFragment();
title = getString(R.string.title_Diet);
break;
case 5:
title = getString(R.string.title_Exit);
finish();
break;
default:
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.container_body, fragment);
fragmentTransaction.commit();
// set the toolbar title
getSupportActionBar().setTitle(title);
}
}
}
and I am trying call this Activity
public class Wrk_plan_gain extends AppCompatActivity implements TabLayout.OnTabSelectedListener {
public Wrk_plan_gain() {
// Required empty public constructor
}
//This is our tablayout
private TabLayout tabLayout;
//This is our viewPager
private ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.wrk_plan_layout_gain);
//Adding toolbar to the activity
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//Initializing the tablayout
tabLayout = (TabLayout) findViewById(R.id.tabLayout);
//Adding the tabs using addTab() method
tabLayout.addTab(tabLayout.newTab().setText("Tab1"));
tabLayout.addTab(tabLayout.newTab().setText("Tab2"));
tabLayout.addTab(tabLayout.newTab().setText("Tab3"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
//Initializing viewPager
viewPager = (ViewPager) findViewById(R.id.pager);
//Creating our pager adapter
Pager adapter = new Pager(getSupportFragmentManager(), tabLayout.getTabCount());
//Adding adapter to pager
viewPager.setAdapter(adapter);
//Adding onTabSelectedListener to swipe views
tabLayout.setOnTabSelectedListener(this);
}
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
}
Also it will every much help full I f I can call this activity from Nav drawer Item ..
I am not able to get it work , in both cases .