I want to make my viewPager support Rtl, and set the current item on the last fragment, but when I write this code in my MainActivity.java, I don't know how I can access the last fragment.
According to this post, I want make my viewPager to Rtl:
iViewPager.setCurrentItem();
MainActivity.java, where I define the viewPager:
package com.example.imajid.grid2.activities;
import android.support.design.widget.NavigationView;
import android.support.design.widget.TabLayout;
import android.support.v4.view.GravityCompat;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
import com.example.imajid.grid2.R;
import com.example.imajid.grid2.adapters.PagerAdapter;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private DrawerLayout mDrawerLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//----------------------- set toolbar
Toolbar iToolbar = (Toolbar) findViewById(R.id.xmlToolbar);
setSupportActionBar(iToolbar);
//------------------------------ initialize toolbar
ActionBar actionBar = getSupportActionBar();
actionBar.setHomeAsUpIndicator(R.drawable.menu);
actionBar.setDisplayHomeAsUpEnabled(true);
//**************************** find tablayout *****************************//
TabLayout iTabLayout = (TabLayout) findViewById(R.id.xmlTabLayout);
iTabLayout.addTab(iTabLayout.newTab());
iTabLayout.addTab(iTabLayout.newTab());
iTabLayout.addTab(iTabLayout.newTab());
iTabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
//******************************* Array list for sending titles *********************************//
ArrayList<String> viewPagersTitle = new ArrayList<String>();
viewPagersTitle.add("صفحه اصلی");
viewPagersTitle.add("فیلم");
viewPagersTitle.add("آهنگ");
//******************************* find view pager in xml *****************************//
ViewPager iViewPager = (ViewPager) findViewById(R.id.xmlViewPager);
//************************************** Rtlizer view pager ************************************
====>iViewPager.setCurrentItem();
//************************************** find adapter for view pager *******************************//
PagerAdapter viewPagerAdapter = new PagerAdapter(getSupportFragmentManager(), iTabLayout.getTabCount(), viewPagersTitle);
//************************************ set adapter for view pager *******************************//
iViewPager.setAdapter(viewPagerAdapter);
//*********************************** setup tablayout to view pager********************************//
iTabLayout.setupWithViewPager(iViewPager);
mDrawerLayout = (DrawerLayout) findViewById(R.id.xmlDrawerLayoutRoot);
//-------------------------------------- find navigation view
NavigationView navigationView = (NavigationView)findViewById(R.id.xmlNavigation);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
menuItem.setChecked(true);
mDrawerLayout.closeDrawers();
Toast.makeText(MainActivity.this, menuItem.getTitle(), Toast.LENGTH_SHORT).show();
return true;
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
return true;
}
//onoptionItemSelected
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int itemId = item.getItemId();
String btnName = null;
switch (itemId){
case android.R.id.home:
mDrawerLayout.openDrawer(GravityCompat.START);
return true;
case R.id.menu_setting:
btnName = "Setting";
break;
case R.id.menu_compass:
btnName = "Compass";
break;
case R.id.menu_help:
btnName = "Help";
break;
}
Toast.makeText(MainActivity.this, "You clicked at " + btnName, Toast.LENGTH_SHORT).show();
return true;
}
}
Finally, this is my view pager adapter:
package com.example.imajid.grid2.adapters;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import com.example.imajid.grid2.fragments.TabFragment1;
import com.example.imajid.grid2.fragments.TabFragment2;
import com.example.imajid.grid2.fragments.TabFragment3;
import java.util.ArrayList;
/**
* Created by imajid on 12/8/2015.
*/
public class PagerAdapter extends FragmentStatePagerAdapter {
private ArrayList<String> titles;
int numOfTabs;
public PagerAdapter(FragmentManager fm, int numOfTabs, ArrayList<String> titles) {
super(fm);
this.numOfTabs = numOfTabs;
this.titles = titles;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
TabFragment1 tab1 = new TabFragment1();
return tab1;
case 1:
TabFragment2 tab2 = new TabFragment2();
return tab2;
case 2:
TabFragment3 tab3 = new TabFragment3();
return tab3;
default:
return null;
}
}
#Override
public int getCount() {
return this.numOfTabs;
}
#Override
public CharSequence getPageTitle(int position) {
return titles.get(position);
}
}
becuse i use :
setCurrentItem(viewPagerAdapter.getCount());
before the setting the adapter it's not working and i should write this code after the setting the adpter , thanks to Kevin Chris and K Neeraj Lal .
Related
Earlier, my code was working fine but after some update in android studio gradle build, there is an error - "error: incompatible types: RecViewFragment cannot be converted to Fragment
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new RecViewFragment()).commit();"
I tried import androidx.fragment.app.Fragment
import android.content.Intent;
import android.os.Bundle;
import android.view.MenuItem;
import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.fragment.app.Fragment;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.google.android.material.navigation.NavigationView;
public class MainActivityBuses extends AppCompatActivity {
NavigationView nav;
ActionBarDrawerToggle toggle;
DrawerLayout drawerLayout;
Toolbar toolbar;
BottomNavigationView btmNav;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_buses);
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
nav = findViewById(R.id.drawernav);
drawerLayout = findViewById(R.id.drawerlayout);
toggle = new ActionBarDrawerToggle(this,drawerLayout, toolbar,R.string.open,R.string.close);
drawerLayout.addDrawerListener(toggle);
toggle.syncState();
nav.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
Fragment selectdnav = null;
switch (item.getItemId()){
case R.id.dnavprofile:
selectdnav = new MyProfileFragment();
drawerLayout.closeDrawer(GravityCompat.START);
break;
case R.id.dnavmap:
selectdnav = new MapFragment();
drawerLayout.closeDrawer(GravityCompat.START);
break;
case R.id.dnavmybus:
selectdnav = new BusFragment();
drawerLayout.closeDrawer(GravityCompat.START);
break;
case R.id.dnavinfo:
selectdnav = new InfoFragment();
drawerLayout.closeDrawer(GravityCompat.START);
break;
}
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,selectdnav).commit();
return true;
}
});
btmNav = (BottomNavigationView) findViewById(R.id.btmnav);
btmNav.setOnNavigationItemSelectedListener((navListner));
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new RecViewFragment()).commit();
btmNav.getMenu().findItem(R.id.navhome).setChecked(true);
}
private BottomNavigationView.OnNavigationItemSelectedListener navListner = new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
Fragment selectedFragment = null;
switch (item.getItemId()){
case R.id.navprofile:
selectedFragment = new MyProfileFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new MyProfileFragment()).commit();
break;
case R.id.navmap:
Intent intent = new Intent(MainActivityBuses.this, MapActivity.class);
startActivity(intent);
finish();
break;
case R.id.navhome:
selectedFragment = new RecViewFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new RecViewFragment()).commit();
break;
case R.id.navmybus:
selectedFragment = new BusFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new BusFragment()).commit();
break;
case R.id.navinfo:
selectedFragment = new InfoFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new InfoFragment()).commit();
break;
}
return true;
}
};
}
RecViewFragment class
package com.example.trackmybusstudent;
import android.app.Fragment;
import android.os.Build;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.RequiresApi;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.Query;
import com.google.firebase.firestore.QuerySnapshot;
import java.util.ArrayList;
import java.util.List;
/**
* A simple {#link Fragment} subclass.
* Use the {#link RecViewFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class RecViewFragment extends Fragment {
RecyclerView recyclerView;
ArrayList datalist;
FirebaseFirestore db;
myadapter myadap;
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
private String mParam1;
private String mParam2;
public RecViewFragment() {
}
public static RecViewFragment newInstance(String param1, String param2) {
RecViewFragment fragment = new RecViewFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#RequiresApi(api = Build.VERSION_CODES.M)
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_rec_view, container, false);
recyclerView = (RecyclerView) v.findViewById(R.id.recycleview);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
db = FirebaseFirestore.getInstance();
datalist = new ArrayList<>();
myadap = new myadapter(datalist);
recyclerView.setAdapter(myadap);
db.collection("Bus_Database").orderBy("Route_Number", Query.Direction.ASCENDING).get().addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
#Override
public void onSuccess(QuerySnapshot queryDocumentSnapshots) {
List<DocumentSnapshot> list = queryDocumentSnapshots.getDocuments();
for(DocumentSnapshot d:list){
model obj = d.toObject(model.class);
datalist.add(obj);
myadap.notifyDataSetChanged();
}
}
});
return v;
}
}
In your switch there's no default case, maybe you didn't set your ids correctly in the menu file, therefore selectdnav remains null.
I suggest you add a breakpoint to quickly analyze this.
When I try to add RecyclerView in the sample application, I get an error E/RecyclerView: No adapter attached; skipping layout.
Because of this, the data which is successfully retrieved from my server does not appear on the screen (empty)
This in my code
MainActivity
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
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.view.View;
import android.widget.Toast;
import page.DefaultFragment;
import page.HomeFragment;
import page.ProfileFragment;
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
private static final String TAG = MainActivity.class.getSimpleName();
private final static String API_KEY = "7e8f60e325cd06e164799af1e317d7a7";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_test);
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);
Fragment fragment = null;
fragment = new DefaultFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.root, fragment);
fragmentTransaction.commit();
}
#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();
Fragment fragment = null;
String title = getString(R.string.app_name);
if (id == R.id.nav_camera) {
fragment = new HomeFragment();
title = "Home";
} else if (id == R.id.nav_gallery) {
fragment = new ProfileFragment();
title = "Profile";
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.root, fragment);
fragmentTransaction.commit();
getSupportActionBar().setTitle(title);
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
public void showToast(String output){
Toast.makeText(this.getBaseContext(), output, Toast.LENGTH_SHORT).show();
}
}
My Fragment code
package page;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import com.transvision.bertho.transvisiondashboardapp.R;
import java.util.List;
import adapter.ChannelAdapter;
import model.Channel;
import model.ChannelResponse;
import rest.ApiClient;
import rest.ApiInterface;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class HomeFragment extends Fragment {
private RecyclerView recyclerView;
private static final String TAG = HomeFragment.class.getSimpleName();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
recyclerView = (RecyclerView) rootView.findViewById(R.id.movies_recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
getChannelData();
// Inflate the layout for this fragment
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
#Override
public void onDetach() {
super.onDetach();
}
public void getChannelData() {
ApiInterface apiService = ApiClient.getChannel().create(ApiInterface.class);
Call<ChannelResponse> call = apiService.getItems();
call.enqueue(new Callback<ChannelResponse>() {
#Override
public void onResponse(Call<ChannelResponse> call, Response<ChannelResponse> response) {
int statusCode = response.code();
List<Channel> channel = response.body().getItems();
recyclerView.setAdapter(new ChannelAdapter(channel, R.layout.list_channel, getActivity()));
}
#Override
public void onFailure(Call<ChannelResponse> call, Throwable t) {
// Log error here since request failed
Log.e(TAG, t.toString());
showToast("CONNECTION ERROR");
}
});
}
public void showToast(String output){
Toast.makeText(getActivity(), output, Toast.LENGTH_SHORT).show();
}
}
My adapter
package adapter;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.transvision.bertho.transvisiondashboardapp.R;
import java.util.List;
import model.Channel;
public class ChannelAdapter extends RecyclerView.Adapter<ChannelAdapter.ChannelViewHolder> {
private List<Channel> channels;
private int rowLayout;
private Context context;
public static class ChannelViewHolder extends RecyclerView.ViewHolder {
LinearLayout moviesLayout;
TextView movieTitle;
TextView data;
TextView movieDescription;
TextView rating;
TextView name;
TextView code;
TextView description;
TextView number;
TextView definition;
TextView paket;
ImageView logo;
public ChannelViewHolder(View v) {
super(v);
moviesLayout = (LinearLayout) v.findViewById(R.id.movies_layout);
name = (TextView) v.findViewById(R.id.title);
definition = (TextView) v.findViewById(R.id.subtitle);
description = (TextView) v.findViewById(R.id.description);
// rating = (TextView) v.findViewById(R.id.rating);
}
}
public ChannelAdapter(List<Channel> channels, int rowLayout, Context context) {
this.channels = channels;
this.rowLayout = rowLayout;
this.context = context;
}
#Override
public ChannelAdapter.ChannelViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(rowLayout, parent, false);
return new ChannelViewHolder(view);
}
#Override
public void onBindViewHolder(ChannelViewHolder holder, final int position) {
holder.name.setText(channels.get(position).getName());
holder.definition.setText(channels.get(position).getDefinition());
holder.description.setText(channels.get(position).getDescription());
// holder.rating.setText(channels.get(position).getVoteAverage().toString());
}
#Override
public int getItemCount() {
return channels.size();
}
}
Is there anything wrong in my code? Or wrong in code placement?
Thanks
Getting data from internet is an async task and may takes too long, here you don't bind any adapter to the recyclerView until you get a response and this is not the usual right way, If you don't get any response for some reasons (e.g no internet connection), then recyclerView.setAdapter won't run, So I suggest you to create an empty adapter first, Then whenever you get response just update the adapter :
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
recyclerView = (RecyclerView) rootView.findViewById(R.id.movies_recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
//Pass empty list to (predefined) adapter
adapter = new ChannelAdapter (new ArrayList<>(), rowLayout, getActivity());
//Bind it to recyclerView
recyclerView.setAdapter(adapter);
getChannelData();
// Inflate the layout for this fragment
return rootView;
}
Add some method to your adapter in case you want add Channel :
public void addChannel(Channel channel) {
channels.add(channel);
notifyDatasetChanged();//even better notifyItemInserted();
}
Now in your response listener add the response body that you got to the adapter:
#Override
public void onResponse(Call<ChannelResponse> call, Response<ChannelResponse> response) {
//Use a loop to add channels you got
adapter.addChannel(responsebodyItems);
}
I'm trying to implement a swipe tab views like this http://www.androidhive.info/2013/10/android-tab-layout-with-swipeable-views-1/.
But when I try to implement getItems method in the Adapter, it doesn't accept my custom Fragment.
Here's the code:
MyActivity.java
package com.bob.app;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.*;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class MainActivity extends AppCompatActivity implements android.support.v7.app.ActionBar.TabListener {
private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private String[] tabs = { getString(R.string.tab_home), getString(R.string.tab_city), getString(R.string.tab_name),getString(R.string.tab_favorites) };
private DrawerLayout drawerLayout;
private ListView listView;
private String[] Drawer_menu_item;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final android.support.v7.app.ActionBar actionbar = getSupportActionBar();
actionbar.setNavigationMode(android.support.v7.app.ActionBar.NAVIGATION_MODE_TABS);
viewPager = (ViewPager) findViewById(R.id.pager);
mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
actionbar.setHomeButtonEnabled(true);
// Adding Tabs
for (String tab_name : tabs) {
actionbar.addTab(actionbar.newTab().setText(tab_name)
.setTabListener((android.support.v7.app.ActionBar.TabListener) this));
Drawer_menu_item= getResources().getStringArray(R.array.menu_item);
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
listView = (ListView) findViewById(R.id.left_drawer);
// Set the adapter for the list view
listView.setAdapter(new ArrayAdapter<String>(this,
R.layout.drawer, Drawer_menu_item));
/* Set the list's click listener
listView.setOnItemClickListener(new DrawerItemClickListener());*/
}
}
#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 onTabSelected(android.support.v7.app.ActionBar.Tab tab, android.support.v4.app.FragmentTransaction ft) {
}
#Override
public void onTabUnselected(android.support.v7.app.ActionBar.Tab tab, android.support.v4.app.FragmentTransaction ft) {
}
#Override
public void onTabReselected(android.support.v7.app.ActionBar.Tab tab, android.support.v4.app.FragmentTransaction ft) {
}
public class TabsPagerAdapter extends FragmentPagerAdapter {
public TabsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int index) {
switch (index) {
case 0:
/* Home fragment
return new Home_fragment();
case 1:
/* City fragment
return new City_fragment();
case 2:
/* Name fragment
return new Name_fragment();
case 3:
/* Favourites fragment
return new Fav_fragment();
}
return null;
}
#Override
public int getCount() {
// get item count - equal to number of tabs
return tabs.length;
}
}
}
Name_fragment.java
package com.bob.sluurpy.app;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by boob on 11/09/15.
*/
public class Name_fragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.name, container, false);
return rootView;
}
}
Please import this import android.support.v4.app.Fragment; in place of import android.app.Fragment; in Name_fragment this may solve your issue!
I have no idea on what is wrong with my code.
My application is using navigation drawer. There are 4 different fragments and one of it is a cardview fragment which I have converted earlier from activity to fragment.
The cardview fragment is being underlined red which shows error that would not able to be compiled. Kindly refer the attached pictures.
If I were to accept the proposed solutions by the Android Studio,it will just solve the CardViewFragment and new problem would occur at the other 3 fragments.
And this is both my main activity and the cardview fragment.
MainActivity.java
package info.androidhive.materialdesign.activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
import info.androidhive.materialdesign.R;
public class MainActivity extends AppCompatActivity implements FragmentDrawer.FragmentDrawerListener {
private static String TAG = MainActivity.class.getSimpleName();
private Toolbar mToolbar;
private FragmentDrawer drawerFragment;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_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.action_settings) {
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 FriendsFragment();
title = getString(R.string.title_friends);
break;
case 2:
fragment = new MessagesFragment();
title = getString(R.string.title_messages);
break;
case 3:
fragment = new CardViewFragment();
title = getString(R.string.title_messages);
break;
default:
break;
}
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);
}
}
}
CardViewFragment.java
package info.androidhive.materialdesign.activity;
import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.CardView;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import java.util.ArrayList;
import info.androidhive.materialdesign.R;
public class CardViewFragment extends Fragment {
private Toolbar toolbar;
private RecyclerView recyclerView;
private CardView cardView;
private ArrayList<FeddProperties> os_versions;
private RecyclerView.Adapter mAdapter;
// private RecyclerView.LayoutManager mLayoutManager;
private LinearLayout llLayout;
private FragmentActivity faActivity;
#Override
/*protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initContrls();
}*/
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
faActivity=(FragmentActivity)
super.getActivity();
llLayout=(LinearLayout)
inflater.inflate(R.layout.activity_main, container, false);
initContrls();
return llLayout;
}
private void initContrls() {
//toolbar = (Toolbar) findViewById(R.id.toolbar);
// cardView = (CardView) findViewById(R.id.cardList);
recyclerView = (RecyclerView) llLayout.findViewById(R.id.my_recycler_view);
/*if (toolbar != null) {
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("Android Versions");
}*/
final String[] versions = {"Alpha", "Beta", "CupCake", "Donut",
"Eclair", "Froyo", "Gingerbread", "Honeycomb",
"Ice Cream Sandwitch", "JellyBean", "KitKat", "LollyPop"};
final int[] icons = {R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.donut, R.drawable.eclair, R.drawable.froyo, R.drawable.gingerbread, R.drawable.honeycomb, R.drawable.icecream_sandwhich, R.drawable.jellybean, R.drawable.kitkat, R.drawable.lollipop};
os_versions = new ArrayList<FeddProperties>();
for (int i = 0; i < versions.length; i++) {
FeddProperties feed = new FeddProperties();
feed.setTitle(versions[i]);
feed.setThumbnail(icons[i]);
os_versions.add(feed);
}
recyclerView.setHasFixedSize(true);
// ListView
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
//Grid View
// recyclerView.setLayoutManager(new GridLayoutManager(this,2,1,false));
//StaggeredGridView
// recyclerView.setLayoutManager(new StaggeredGridLayoutManager(2,1));
// create an Object for Adapter
mAdapter = new CardViewDataAdapter(os_versions);
// set the adapter object to the Recyclerview
recyclerView.setAdapter(mAdapter);
}
/* #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);
}*/
}
In MainActivity.java, you declared
import android.support.v4.app.Fragment
Import the same type of Fragment in CardViewFragment.java instead of
import android.app.Fragment;
so that it's clear that the same type of Fragment is being used in both pieces of code.
I am making some android apps with viewpager in fragment. It shows tabs correct, but I can't see any content in my code. I trying to find and search in stackoverflow and google but I don't know why this code is not working. The code looks strange and i am very sorry about that. I am a first quesiton on here. Thx to help me :-)
This is MainActivity.java
package com.yeungnam.food;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.Fragment;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
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;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends Activity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
CustomDrawerAdapter adapter;
List<DrawerItem> dataList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initializing
dataList = new ArrayList<DrawerItem>();
mTitle = mDrawerTitle = getTitle();
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
/* mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow,
GravityCompat.START); */
dataList.add(new DrawerItem(true));
dataList.add(new DrawerItem("Message", R.drawable.ic_action_camera));
dataList.add(new DrawerItem("Likes", R.drawable.ic_action_cloud));
dataList.add(new DrawerItem("Games", R.drawable.ic_action_email));
adapter = new CustomDrawerAdapter(this, R.layout.custom_drawer_item,
dataList);
mDrawerList.setAdapter(adapter);
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, R.string.drawer_open,
R.string.drawer_close) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
invalidateOptionsMenu(); // creates call to
// onPrepareOptionsMenu()
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
invalidateOptionsMenu(); // creates call to
// onPrepareOptionsMenu()
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
SelectItem(1);
}
}
public void SelectItem(int possition) {
Fragment fragment = null;
Bundle args = new Bundle();
switch (possition) {
case 1:
fragment = new FragmentFood();
/* args.putString(FragmentFood.ITEM_NAME, dataList.get(possition)
.getItemName());
args.putInt(FragmentFood.IMAGE_RESOURCE_ID, dataList.get(possition)
.getImgResID()); */
break;
case 2:
fragment = new FragmentFood();
/* args.putString(FragmentFood.ITEM_NAME, dataList.get(possition)
.getItemName());
args.putInt(FragmentFood.IMAGE_RESOURCE_ID, dataList.get(possition)
.getImgResID()); */
break;
case 3:
fragment = new FragmentFood();
/* args.putString(FragmentFood.ITEM_NAME, dataList.get(possition)
.getItemName());
args.putInt(FragmentFood.IMAGE_RESOURCE_ID, dataList.get(possition)
.getImgResID()); */
break;
default:
break;
}
fragment.setArguments(args);
FragmentManager frgManager = getFragmentManager();
frgManager.beginTransaction().replace(R.id.content_frame, fragment)
.commit();
mDrawerList.setItemChecked(possition, true);
setTitle(dataList.get(possition).getItemName());
mDrawerLayout.closeDrawer(mDrawerList);
}
#Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
#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);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// The action bar home/up action should open or close the drawer.
// ActionBarDrawerToggle will take care of this.
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
return false;
}
private class DrawerItemClickListener implements
ListView.OnItemClickListener {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
if(dataList.get(position).isFirst == false)
SelectItem(position);
}
}
#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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
} */
}
This is FragmentFood.java
package com.yeungnam.food;
import android.app.Fragment;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.astuetz.PagerSlidingTabStrip;
public class FragmentFood extends Fragment {
private PagerSlidingTabStrip tabs;
private ViewPager pager;
private FoodAdapter adapter;
public FragmentFood() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_food, container,
false);
tabs = (PagerSlidingTabStrip) view.findViewById(R.id.tabs);
pager = (ViewPager) view.findViewById(R.id.pager);
adapter = new FoodAdapter(getActivity());
pager.setAdapter(adapter);
tabs.setViewPager(pager);
return view;
}
public class FoodAdapter extends PagerAdapter {
private final String[] TITLES = { "breafkast", "lunch", "dinner" };
private LayoutInflater mInflater;
public FoodAdapter(Context c) {
super(); mInflater = LayoutInflater.from(c);
}
#Override
public CharSequence getPageTitle(int position) {
return TITLES[position];
}
#Override
public int getCount() {
return TITLES.length;
}
#Override
public Object instantiateItem(ViewGroup pager, int position) {
// looks a little bit messy here
TextView v = new TextView(getActivity());
v.setBackgroundResource(R.color.background_window);
v.setText("PAGE " + (position + 1));
final int padding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 16, getResources()
.getDisplayMetrics());
v.setPadding(padding, padding, padding, padding);
v.setGravity(Gravity.CENTER);
pager.addView(v, 0);
return v;
}
#Override
public void destroyItem(ViewGroup container, int position, Object view) {
container.removeView((View) view);
}
#Override
public boolean isViewFromObject(View view, Object object) {
return false;
}
}
}
I also encountered a similar problem，but i use FragmentAdapter. you can refer to the following:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_first_main, container, false);
textViewMesuemInfo = (TextView) view.findViewById(R.id.textViewMesuemInfo);
textViewOpenInfo = (TextView) view.findViewById(R.id.textViewOpenInfo);
fragmentAdapter = new IntroPagerAdapter(**getChildFragmentManager()**);
sliViewPager = (ViewPager) view.findViewById(R.id.viewPagerMain);
sliViewPager.setOnPageChangeListener(pagerChangeListener);
sliViewPager.setAdapter(fragmentAdapter);
sliViewPager.setCurrentItem(0);
return view;
}
private class IntroPagerAdapter extends FragmentPagerAdapter {
public IntroPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public int getCount() {
return 4;
}
#Override
public Fragment getItem(int position) {
Log.i("position=",position+"");
switch (position) {
case 0:
return new IntroFragment().setLayout(R.layout.fragment_colckbuild);
case 1:
return new IntroFragment().setLayout(R.layout.fragment_playclock);
case 2:
return new IntroFragment().setLayout(R.layout.fragment_measureinfo);
case 3:
return new IntroFragment().setLayout(R.layout.fragment_playclock);
default:
return null;
}
}