Develop Reference

How to fix TextView being rendered blank on new Activity

I'm trying to start another activity after clicking on a CardView inside a RecyclerView. The new activity renders after the click on any of the items inside the RecyclerView (It does the transition and changes the title TextView), but it does not show any of the TextView's inside the CardView on the layout.
The OnClick method is being set as an interface and being implemented in the first Activity.
Here is my first activity. I'm loading the data here from a SQLite database, but it's not relevant for the question to show the code from it.
public class MainActivity extends AppCompatActivity implements RecipeAdapterMain.OnCardListener {
private TextView tv;
ArrayList<RecipeObject> recipes = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerView rv = findViewById(R.id.recipeListMain);
LinearLayoutManager llm = new LinearLayoutManager(this);
rv.setLayoutManager(llm);
RecipeAdapterMain adapter = new RecipeAdapterMain(recipes, this);
rv.setAdapter(adapter);
tv = findViewById(R.id.title);
}
#Override
public void onCardClick(int position) {
Intent intent = new Intent(this, RecipeActivity.class);
startActivity(intent);
}
}
This is my Adapter.
public class RecipeAdapterMain extends RecyclerView.Adapter<RecipeAdapterMain.RecipeListViewHolder> {
RecyclerView mRecyclerView;
ArrayList<RecipeObject> recipeList;
private OnCardListener mOnCardListener;
public RecipeAdapterMain(Context context, ArrayList<RecipeObject> recipeList, OnCardListener onCardListener) {
this.mOnCardListener = onCardListener;
this.recipeList = recipeList;
}
#Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
mRecyclerView = recyclerView;
super.onAttachedToRecyclerView(recyclerView);
}
#Override
public RecipeListViewHolder onCreateViewHolder(ViewGroup parent, int i) {
View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_recipe_main, parent, false);
RecipeListViewHolder rcv = new RecipeListViewHolder(layoutView, mOnCardListener);
return rcv;
}
#Override
public void onBindViewHolder(#NonNull RecipeListViewHolder holder, int position) {
holder.mName.setText(recipeList.get(position).getName());
}
#Override
public int getItemCount(){
return recipeList.size();
}
public class RecipeListViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public TextView mName;
OnCardListener onCardListener;
public RecipeListViewHolder(final View view, OnCardListener onCardListener) {
super(view);
mName = view.findViewById(R.id.textViewTitle);
this.onCardListener = onCardListener;
view.setOnClickListener(this);
}
#Override
public void onClick(View v) {
onCardListener.onCardClick(getAdapterPosition());
}
}
public interface OnCardListener {
void onCardClick(int position);
}
}
My second activity:
public class RecipeActivity extends AppCompatActivity {
#Override
public void onCreate(#Nullable Bundle savedInstanceState, #Nullable PersistableBundle persistentState) {
super.onCreate(savedInstanceState, persistentState);
setContentView(R.layout.layout_recipe);
}
}
This is the layout from the second activity. (layout_recipe):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/textViewName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This is a test"
android:textColor="#1A1A1A"
android:textSize="18sp" />
<TextView
android:id="#+id/textViewIngr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This is a test"
android:textColor="#1A1A1A"
android:textSize="18sp" />
<TextView
android:id="#+id/textViewDire"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This is a test"
android:textColor="#1A1A1A"
android:textSize="18sp" />
</LinearLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>
And this is the layout from the first activity (activity_main):
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
</com.google.android.material.appbar.AppBarLayout>
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/recipeListMain"
android:scrollbars="vertical">
</androidx.recyclerview.widget.RecyclerView>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:backgroundTint="#color/colorAccent"
android:layout_gravity="end|bottom"
android:layout_margin="16dp"
android:layout_marginBottom="16dp"
android:contentDescription="#string/submit"
android:src="#drawable/ic_add_black_24dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:onClick="openActivityCreate"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
From clicking in a Card on the MainActivity, I expected to render the second activity with it's TextViews (This is a test), but it's rendering a blank page instead.

try removing #Nullable PersistableBundle persistentState from onCreate on your second activity

ViewPager and his fragments

Like a lot of other people on the stackoverflow, for example:
https://ru.stackoverflow.com/questions/571704/%D0%A0%D0%B0%D0%B7%D0%BD%D1%8B%D0%B9-%D0%BA%D0%BE%D0%BD%D1%82%D0%B5%D0%BD%D1%82-%D0%BD%D0%B0-%D1%81%D1%82%D1%80%D0%B0%D0%BD%D0%B8%D1%86%D0%B0%D1%85-viewpager
I'm trying to create ViewPager with different layouts, but with:
https://github.com/ogaclejapan/SmartTabLayout
Expectation: beautiful ViewPager with 3 tabs, which can switch different layouts/fragments by clicking on the buttons or by swipe.
Reality: beautiful ViewPager with 3 tabs, which are doing nothing.
Looking for your help, thanks.
What I have done in MainActivity class:
public class MainActivity extends AppCompatActivity
{
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportActionBar().setElevation(0); //toolbar shadow
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
ViewGroup tab = findViewById(R.id.linear_test);
tab.addView(LayoutInflater.from(this).inflate(R.layout.activity_main, tab, false));
ViewPager viewPager = findViewById(R.id.viewpager);
SmartTabLayout viewPagerTab = findViewById(R.id.viewpagertab);
setup(viewPagerTab);
FragmentPagerItems pages = new FragmentPagerItems(this);
pages.add(FragmentPagerItem.of("Вкладка 1", DemoFragment.class));
pages.add(FragmentPagerItem.of("Вкладка 2", DemoFragment.class));
pages.add(FragmentPagerItem.of("Вкладка 3", DemoFragment.class));
FragmentPagerItemAdapter adapter = new FragmentPagerItemAdapter(
getSupportFragmentManager(), pages);
viewPager.setAdapter(adapter);
viewPagerTab.setViewPager(viewPager);
}
public void setup(final SmartTabLayout layout) {
//Do nothing.
}
}
What I have done in my DemoFragment:
public class DemoFragment extends Fragment {
static final String ARGUMENT_PAGE_NUMBER = "arg_page_number";
private int page;
static DemoFragment newInstance(int page) {
DemoFragment pageFragment = new DemoFragment();
Bundle arguments = new Bundle();
arguments.putInt(ARGUMENT_PAGE_NUMBER, page);
pageFragment.setArguments(arguments);
return pageFragment;
}
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container,
#Nullable Bundle savedInstanceState) {
// View view = inflater.inflate(R.layout.activity_main, container, false);
page = getArguments().getInt("someInt", 0);
return inflater.inflate(R.layout.activity_main, container, false);
// return view;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
int position = FragmentPagerItem.getPosition(getArguments());
getItem(position);
}
public Fragment getItem(int position) {
switch (position) {
case 0: // Fragment # 0 - This will show FirstFragment
return DemoFragment.newInstance(1);
case 1: // Fragment # 0 - This will show FirstFragment different title
return DemoFragment.newInstance(2);
case 2: // Fragment # 1 - This will show SecondFragment
return DemoFragment.newInstance(3);
default:
return null;
}
}
}
Here is activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white">
<LinearLayout
android:id="#+id/linear_test"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:ignore="MissingConstraints"
android:background="#color/colorPrimary"
android:orientation="horizontal" >
<com.ogaclejapan.smarttablayout.SmartTabLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/viewpagertab"
android:layout_width="match_parent"
android:layout_height="#dimen/tab_height_large"
app:stl_customTabTextLayoutId="#layout/test_layout"
app:stl_customTabTextViewId="#id/custom_tab_text"
app:stl_distributeEvenly="true"
app:stl_defaultTabTextAllCaps="false"
app:stl_indicatorInterpolation="linear"
app:stl_defaultTabTextColor="#color/white"
app:stl_indicatorColor="#color/colorBlue"
app:stl_underlineColor="#color/colorBlue"
app:stl_defaultTabBackground="#color/colorPrimary"
app:stl_indicatorThickness="3dp"
app:stl_underlineThickness="1dp"
/>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/viewpagertab"
/>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/playlist_recycler"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/linear_test" />
<TextView
android:id="#+id/dl_params"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginTop="10dp"
android:visibility="gone"
android:layout_weight="1"
tools:ignore="MissingConstraints"/>
</android.support.constraint.ConstraintLayout>
And finally test_layout which one is filling those SmartTabLayout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/tab"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="?attr/selectableItemBackground"
>
<android.support.v4.widget.Space
android:id="#+id/center_anchor"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_centerInParent="true"
/>
<aectann.pr1.TintableImageView
android:id="#+id/custom_tab_icon"
android:layout_width="24dp"
android:layout_height="24dp"
android:layout_above="#id/center_anchor"
android:layout_centerHorizontal="true"
android:scaleType="center"
android:src="#drawable/custom_icon"
/>
<TextView
android:id="#+id/custom_tab_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/center_anchor"
android:layout_centerHorizontal="true"
android:layout_marginTop="2dp"
android:maxLines="1"
android:textSize="14sp"
android:textColor="#color/white"
/>
</RelativeLayout>
Any ideas, guys?

Widget layout from Activity still appear after fragment add transaction

I have a problem with fragments. I add fragments dynamically without removing old fragments so they can be recalled when I return. But when I applied the following snippet I found that some of the views that came from the activity did not disappear, such as the Button, TextView, and so on. The results I get are overlapping views
MainActivity.Java
public class MainActivity extends AppCompatActivity implements BlankFragment.OnFragmentInteractionListener {
private static final String TAG = "MainActivity";
private Unbinder unbinder;
private FragmentManager fragmentManager;
#BindView(R.id.dynamic_fragment_frame)
FrameLayout frameLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_reading);
unbinder = ButterKnife.bind(this);
fragmentManager = this.getSupportFragmentManager();
}
public void openFragment(View view) {
BlankFragment fragment = BlankFragment.newInstance("Test 1");
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_right, R.anim.enter_from_right, R.anim.exit_to_right);
transaction.addToBackStack(null);
transaction.add(R.id.dynamic_fragment_frame, fragment, "BLACK_FRAGMENT");
transaction.commit();
}
#Override
protected void onDestroy() {
unbinder.unbind();
super.onDestroy();
}
#Override
public void onFragmentInteraction(String text) {
Log.d(TAG, "onFragmentInteraction: " + text);
onBackPressed();
}
}
activity_reading.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00d9ff"
tools:context=".MainActivity">
<FrameLayout
android:id="#+id/dynamic_fragment_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<TextView
android:id="#+id/title_read_news"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Ini Judul"
android:textAppearance="#style/TextAppearance.AppCompat.Large"
android:layout_gravity="center"
android:paddingBottom="5dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:onClick="openFragment"
android:text="Open"
android:stateListAnimator="#null"/>
</RelativeLayout>
BlankFragment.java
public class BlankFragment extends Fragment {
private static final String ARG_TEXT = "TEXT";
private Unbinder unbinder;
private String mParam1;
private OnFragmentInteractionListener mListener;
#BindView(R.id.tv_blank_fragment)
TextView tvTitle;
#BindView(R.id.back_btn)
Button backBtn;
#BindView(R.id.next_btn)
Button nextBtn;
private FragmentManager fragmentManager;
public BlankFragment() {
// Required empty public constructor
}
public static BlankFragment newInstance(String param1) {
BlankFragment fragment = new BlankFragment();
Bundle args = new Bundle();
args.putString(ARG_TEXT, param1);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_TEXT);
}
fragmentManager = getFragmentManager();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_blank, container, false);
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
unbinder = ButterKnife.bind(this, view);
tvTitle.setText(mParam1);
backBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String test = "test dari fragment";
sendBack(test);
}
});
nextBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
}
public void sendBack(String sendback) {
if (mListener != null) {
mListener.onFragmentInteraction(sendback);
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
public interface OnFragmentInteractionListener {
void onFragmentInteraction(String text);
}
}
fragment_blank.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#cfcf1d"
tools:context=".BlankFragment">
<TextView
android:id="#+id/tv_blank_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/hello_blank_fragment" />
<Button
android:id="#+id/next_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/back_btn"
android:layout_alignParentStart="true"
android:text="Create new Fragment" />
<Button
android:id="#+id/back_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:text="back" />
</RelativeLayout>
Everything went smoothly but the result of my Mainactivity layout still appeared on fragment. Please help me
Result as shows as below:
here 1
here 2

In activity_reading, the fragment container view (dynamic_fragment_frame) is declared first, so the button and the text view will be displayed on top of it. If you move the fragment container to the bottom, the fragments will be displayed correctly, so the layout should look something like this:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00d9ff"
tools:context=".MainActivity">
<TextView
android:id="#+id/title_read_news"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Ini Judul"
android:textAppearance="#style/TextAppearance.AppCompat.Large"
android:layout_gravity="center"
android:paddingBottom="5dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:onClick="openFragment"
android:text="Open"
android:stateListAnimator="#null"/>
<FrameLayout
android:id="#+id/dynamic_fragment_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00d9ff"
tools:context=".MainActivity">
<FrameLayout
android:id="#+id/dynamic_fragment_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<TextView
android:id="#+id/title_read_news"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Ini Judul"
android:textAppearance="#style/TextAppearance.AppCompat.Large"
android:layout_gravity="center"
android:paddingBottom="5dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:onClick="openFragment"
android:text="Open"
android:stateListAnimator="#null"/>
</RelativeLayout>
With the above layout, Imagine that the TextView and Button are over the FragmeLayout. So when you add a Fragment to the FrameLayout, the TextView and Button are still over the FragmeLayout. To hide these views, you should use TextView.setVisibility(View.GONE) and Button.setVisibility(View.GONE) when adding a Fragment

How to set view to a specific fragment when clicked recognized in navigation drawer in Android?

I have used a sectionsPageAdapter class in Java which is given below.
This is a tabbed activity and I later added a navigation drawer to it.
Now I wish to let user navigate through tabs from the main activity by swiping (which works successfully) and also through nav drawer as I have included the same fragments names there also.
what code should i write in the switch case to direct user to the clicked fragment activity?
Main Activity.java
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private SectionsPageAdapter mSectionsPageAdapter;
private ViewPager mViewPager;
private ArrayAdapter<String> mAdapter;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d(TAG,"onCreate: Starting");
mSectionsPageAdapter =new SectionsPageAdapter(getSupportFragmentManager());
mViewPager =(ViewPager)findViewById(R.id.container);
setupViewPager(mViewPager);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
mDrawerLayout =(DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList=(ListView)findViewById(R.id.navList);
addDrawerItems();
mDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
switch (position)
{
case 0:
// what Code??
break;
case 1:
break;
}
}
});
}
private void setupViewPager(ViewPager viewPager){
SectionsPageAdapter adapter=new SectionsPageAdapter(getSupportFragmentManager());
adapter.addFragment(new Tab1Fragment(),"Our Picks");
adapter.addFragment(new Tab2Fragment(),"Technology");
adapter.addFragment(new Tab3Fragment(),"Fashion");
viewPager.setAdapter(adapter);
}
private void addDrawerItems() {
String[] osArray = { "Our Picks", "Technology","Fashion" };
mAdapter = new ArrayAdapter<String>(this,R.layout.drawerpart1, osArray);
mDrawerList.setAdapter(mAdapter);
}
SectionsPageAdapter.java
public class SectionsPageAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList=new ArrayList<>();
private final List<String> mFragmentTitleList=new ArrayList<>();
public void addFragment(Fragment fragment,String title){
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
public SectionsPageAdapter(FragmentManager fm) {
super(fm);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:id="#+id/drawer_layout"
android:layout_height="match_parent"
tools:context="com.example.aa.news.MainActivity">
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
>
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>
<ListView
android:id="#+id/navList"
android:layout_width="250dp"
android:layout_height="match_parent"
android:layout_gravity="left|start"
android:background="#ffeeeeee"/>
</android.support.v4.widget.DrawerLayout>
drawerpart1.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/label"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dip"
android:textSize="16dip"
android:textStyle="bold" >
</TextView>
Tab1Fragment
public class Tab1Fragment extends Fragment {
private static final String TAG = "Tab1Fragment";
private Button btn1;
#Nullable
#Override
public View onCreateView(#Nullable LayoutInflater inflater, #Nullable ViewGroup container,#Nullable Bundle savedInstanceState)
{
View view= inflater.inflate(R.layout.tab1_fragment,container,false);
btn1=(Button) view.findViewById(R.id.btn1);
btn1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getActivity(),"Button 1 Clicked",Toast.LENGTH_SHORT).show();
}
});
return view;
}
}
tab1_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="#+id/btn1"
android:text="Button 1" />
<TextView
android:layout_height="60dp"
android:layout_width="120dp"
android:id="#+id/tv1"
android:text="Fragment 1"/>
</LinearLayout>
The other fragments tab2 and 3 are same as tab 1.

Use setCurrentItem() on viewpager
mDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener(){
#Override
public void onItemClick (AdapterView < ? > parent, View view,int position, long id){
mViewPager.setCurrentItem(position);
}
});

ViewPager + TabLayout with NavigationDrawer in every Activity - Issue

I encountered a problem that I didn't managed to solve: I have a MainActivity where there's a NavigationDrawer that allows me to go to three different activities. Those extend the MainActivity so I get the Drawer in every activity.
In the same MainActivity, I put a TabLayout with three tab Fragments.
The problem I'm facing is that whenever I go to one of the three activity from the drawer layout, I don't get the layout xml attached to Activity1 but instead I get again the TabLayout with the Fragments.
How can I solve this?
The result should look like Google Play app.
Here's my MainActivity:
public class MainActivity extends AppCompatActivity {
DrawerLayout mDrawerLayout;
ListView mDrawerList;
ActionBarDrawerToggle mDrawerToggle;
CollectionPagerAdapter mCollectionPagerAdapter;
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar_layout);
TextView mTitle = (TextView) toolbar.findViewById(R.id.toolbar_title);
mTitle.setText(R.string.app_name);
setSupportActionBar(toolbar);
assert getSupportActionBar() != null;
this.getSupportActionBar().setDisplayShowTitleEnabled(false);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer);
Button button1 = (Button)findViewById(R.id.button1); //this is inside the drawer layout
button1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, Activity1.class);
startActivity(intent);
}
});
mDrawerToggle = new ActionBarDrawerToggle(this,
mDrawerLayout,
null,
R.string.drawer_open,
R.string.drawer_close) {
public void onDrawerClosed(View v) {
super.onDrawerClosed(v);
invalidateOptionsMenu();
syncState();
}
public void onDrawerOpened(View v) {
super.onDrawerOpened(v);
invalidateOptionsMenu();
syncState();
}
};
mDrawerLayout.addDrawerListener(mDrawerToggle);
mDrawerToggle.setDrawerIndicatorEnabled(false);
mDrawerToggle.syncState();
mCollectionPagerAdapter = new CollectionPagerAdapter(
getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mCollectionPagerAdapter);
TabLayout tabs = (TabLayout)findViewById(R.id.tabs);
tabs.setupWithViewPager(mViewPager);
}
public class CollectionPagerAdapter extends FragmentPagerAdapter {
//final int NUM_ITEMS = 3; // number of tabs
public CollectionPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position)
{
switch (position) {
case 0:
return new Tab1();
case 1:
return new Tab2();
case 2:
return new Tab3();
}
return null;
}
#Override
public int getCount()
{
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position)
{
case 0:
return getString(R.string.tab1);
case 1:
return getString(R.string.tab2);
case 2:
return getString(R.string.tab3);
}
return null;
}
}
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mDrawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home: {
if (mDrawerLayout.isDrawerOpen(mDrawerList)) {
mDrawerLayout.closeDrawer(mDrawerList);
} else {
mDrawerLayout.openDrawer(mDrawerList);
}
return true;
}
default:
return super.onOptionsItemSelected(item);
}
}
Activity1:
public class Activity1 extends MainActivity { //extends MainActivity
#Override
protected void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.classe1); //setContentView before super.onCreate(savedInstanceState) allows me to get drawer in each activity
super.onCreate(savedInstanceState);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar_layout);
TextView mTitle = (TextView) toolbar.findViewById(R.id.toolbar_title);
mTitle.setText("Activity 1");
setSupportActionBar(toolbar);
assert getSupportActionBar() != null;
this.getSupportActionBar().setDisplayShowTitleEnabled(false);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
}
Tab1 (Fragment):
public class Tab1 extends Fragment {
View view;
public Tab1() {
}
#SuppressLint("InflateParams")
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.tab1, null);
return view;
}
and my activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:layout_height="match_parent"
android:layout_width="match_parent">
<android.support.v4.view.ViewPager
android:layout_height="match_parent"
android:layout_width="match_parent"
android:layout_marginBottom="60dp"
android:id="#+id/pager">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none"
android:overScrollMode="never">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
android:orientation="vertical">
</LinearLayout>
</ScrollView>
</android.support.v4.view.ViewPager>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="bottom">
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="30dp"
android:id="#+id/tabs"
app:tabMode="scrollable"
app:tabSelectedTextColor="#color/colorPrimaryDark"
app:tabTextColor="#color/tab_text"
app:tabIndicatorColor="#android:color/transparent"
app:tabBackground="#drawable/selected_tab_color"
style="#style/MyCustomTabLayout"/>
<include layout="#layout/toolbar" android:id="#+id/toolbar_layout"/>
</LinearLayout>
</RelativeLayout>
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="304dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:clickable="true"
android:background="#ffffff">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/uno"
android:text="Button to Activity1"/>
</LinearLayout>
</ScrollView>
</LinearLayout>
classe1.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent">
<FrameLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:layout_marginBottom="30dp"
android:id="#+id/content_frame">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none"
android:overScrollMode="never">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="CLASSE 1"
android:textSize="35sp"
android:gravity="center"/>
</LinearLayout>
</ScrollView>
</FrameLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom">
<include layout="#layout/toolbar" android:id="#+id/toolbar_layout"/>
</RelativeLayout>
</RelativeLayout>

Your problem is that the super.onCreate() call in Activity1 is calling setContentView() again in MainActivity, which is completely replacing Activity1's layout set with its call to setContentView().
Since you want tabs in MainActivity but not the other Activities, your other Activities shouldn't extend MainActivity. Instead, you should create a base Activity with the DrawerLayout that all of your Activities extend, including MainActivity, and then add whichever Views you need in the individual subclasses.
In the base Activity, we'll override the setContentView() method to first set the base layout, setup the drawer and toggle, and then inflate the subclass's layout into the DrawerLayout's content View. Note that we do not call setContentView() in the base Activity's onCreate() method.
public abstract class BaseActivity extends AppCompatActivity {
protected Toolbar toolbar;
protected DrawerLayout mDrawerLayout;
protected ActionBarDrawerToggle mDrawerToggle;
protected TextView mTitle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
}
#Override
public void setContentView(int layoutResID) {
super.setContentView(R.layout.activity_base);
toolbar = (Toolbar) findViewById(R.id.toolbar_layout);
mTitle = (TextView) toolbar.findViewById(R.id.toolbar_title);
mTitle.setText(R.string.app_name);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
//this is inside the drawer layout
Button button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(BaseActivity.this, Activity1.class);
startActivity(intent);
}
});
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerToggle = new ActionBarDrawerToggle(this,
mDrawerLayout,
null,
R.string.drawer_open,
R.string.drawer_close) {
public void onDrawerClosed(View v) {
super.onDrawerClosed(v);
invalidateOptionsMenu();
syncState();
}
public void onDrawerOpened(View v) {
super.onDrawerOpened(v);
invalidateOptionsMenu();
syncState();
}
};
mDrawerLayout.addDrawerListener(mDrawerToggle);
mDrawerToggle.setDrawerIndicatorEnabled(false);
mDrawerToggle.syncState();
getLayoutInflater().inflate(layoutResID,
(ViewGroup) findViewById(R.id.content));
}
}
The base layout is pretty much the same, except everything specific to MainActivity is removed.
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout android:id="#+id/content"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
<include layout="#layout/toolbar" android:id="#+id/toolbar_layout"/>
</LinearLayout>
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="304dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:clickable="true"
android:background="#ffffff">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button1"
android:text="Button to Activity1"/>
</LinearLayout>
</ScrollView>
</LinearLayout>
</android.support.v4.widget.DrawerLayout>
In MainActivity, we no longer need to setup the drawer and toggle.
public class MainActivity extends BaseActivity {
private CollectionPagerAdapter mCollectionPagerAdapter;
private ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mCollectionPagerAdapter = new CollectionPagerAdapter(
getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mCollectionPagerAdapter);
TabLayout tabs = (TabLayout)findViewById(R.id.tabs);
tabs.setupWithViewPager(mViewPager);
}
...
}
And the layout for MainActivity is now basically just the ViewPager and TabLayout.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="#+id/pager">
...
</android.support.v4.view.ViewPager>
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="30dp"
android:id="#+id/tabs"
app:tabMode="scrollable"
app:tabSelectedTextColor="#color/colorPrimaryDark"
app:tabTextColor="#color/tab_text"
app:tabIndicatorColor="#android:color/transparent"
app:tabBackground="#drawable/selected_tab_color"
style="#style/MyCustomTabLayout" />
</LinearLayout>
Then, to accomplish everything in Activity1 that your posted code is doing, all we need is this, since the Toolbar and title TextView are now in BaseActivity.:
public class Activity1 extends BaseActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.classe1);
mTitle.setText("Activity 1");
}
}
And the layout for Activity1 can be pared down significantly:
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none"
android:overScrollMode="never">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="CLASSE 1"
android:textSize="35sp"
android:gravity="center"/>
</LinearLayout>
</ScrollView>

You call setContentView two times in the Activity1 onCreate method, the first time with R.layout.classe1 and the second time with R.layout.activity_main (when you call the super.onCreate). The last setContentView wins, your problem is here.