Develop Reference

Floating action button not showing in bottomsheetfragment collapsed state

I have BottomSheetFragment with recyclerview and fab button. I am having issue in showing up Floating action button in BottomSheetBehavior.STATE_COLLAPSED. Fab button come up as soon as i expand bottom sheet to fullscreen i tried several method but none work.
I tried different fab option in layout to make it visible but no luck till now.
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/topBarBottomSheet"
android:clipToPadding="true"
android:layout_height="match_parent"
android:layout_width="match_parent"
>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/topBarBottomSheet">
<include layout="#layout/progressbar_framelayout" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycleviewGallery"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false"
android:paddingTop="#dimen/list_item_spacing_half"
android:paddingBottom="#dimen/list_item_spacing_half"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:listitem="#layout/recycler_view_item_3"
tools:spanCount="3"
tools:layoutManager="GridLayoutManager" />
</FrameLayout>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fabBottomSheet"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
app:backgroundTint="#color/greenElaxer"
app:fabSize="normal"
app:srcCompat="#drawable/ic_check"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:overScrollMode="always"
>
</com.google.android.material.floatingactionbutton.FloatingActionButton>
</RelativeLayout>
BottomSheetFragment
public class BottomSheet extends BottomSheetDialogFragment {
FloatingActionButton fab;
RecyclerView recyclerView;
// TODO: Customize parameters
public static BottomSheet newInstance() {
/*final Bundle args = new Bundle();
args.putInt(ARG_ITEM_COUNT, itemCount);
fragment.setArguments(args);*/
return new BottomSheet();
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container,#Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_bottemsheet_list_dialog, container, false);
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
recyclerView = view.findViewById(R.id.recycleviewGallery);
fab = view.findViewById(R.id.fabBottomSheet);
BottomSheetAdapter bottomSheetAdapter = new BottomSheetAdapter();
GridLayoutManager gridLayoutManager=new GridLayoutManager(getActivity(),2);
recyclerView.setLayoutManager(gridLayoutManager);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(bottomSheetAdapter);
}
#NonNull
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
BottomSheetDialog dialog = (BottomSheetDialog) super.onCreateDialog(savedInstanceState);
dialog.setOnShowListener(new DialogInterface.OnShowListener() {
#Override
public void onShow(DialogInterface dialog) {
//Get the BottomSheetBehavior
BottomSheetDialog d = (BottomSheetDialog) dialog;
FrameLayout bottomSheet = d.findViewById(com.google.android.material.R.id.design_bottom_sheet);
if (bottomSheet != null) {
bottomSheet.getLayoutParams().height = ViewGroup.LayoutParams.MATCH_PARENT;
bottomSheetBehavior = BottomSheetBehavior.from(bottomSheet);
bottomSheet.setMinimumHeight(350);
bottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
#Override
public void onStateChanged(#NonNull View view, int i) {
switch (i){
case BottomSheetBehavior.STATE_COLLAPSED:
Log.d(TAG,"Collapsed");
break;
case BottomSheetBehavior.STATE_DRAGGING:
Log.d(TAG,"Dragging");
break;
case BottomSheetBehavior.STATE_EXPANDED:
Log.d(TAG,"Expanded");
break;
case BottomSheetBehavior.STATE_HALF_EXPANDED:
Log.d(TAG,"Half Expanded");
break;
case BottomSheetBehavior.STATE_HIDDEN:
Log.d(TAG,"Hidden");
dismiss();
break;
case BottomSheetBehavior.STATE_SETTLING:
Log.d(TAG,"Settling");
break;
}
}
#Override
public void onSlide(#NonNull View view, float v) {
}
});
}
}
});
return dialog;
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
final Fragment parent = getParentFragment();
Log.d(TAG,"Parent = "+parent+" Context "+context);
if (parent != null) {
mListener = (Listener) parent;
} else {
mListener = (Listener) context;
}
}
#Override
public void onDetach() {
mListener = null;
super.onDetach();
}
}
Whenever i collapsed bottom sheet the fab button also make itself down with bottom sheet.i need to make my fab button stick to same place whether i expand or collapsed bottom sheet. Thanks in advance.
I need to stick to same layout(Relative layout)

You can't make an UI element from a certain fragment stick around when you're exiting that fragment. If a bottomsheet is collapsed, all its UI elements are collapsed. You can't make on stick around.
You could write a duplicate fab that shows after you closed the bottomsheet in the underlying fragment.
For example, I have this code in my bottomsheet to exit the bottomsheet dialog.
nextButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mBottomSheetDialog.dismiss();
mTimePickerDialogController.show(0, 0, makeTimePickerDialogTag());
}});
When you dismiss the bottomsheet, you could use the following code to make a fab in the underlying fragment appear or disappear.
mFloatingActionButton.hide();
mFloatingActionButton.show();
Edit: A better solution for handling the second fab.
BottomSheetBehavior sheetBehavior;
sheetBehavior = BottomSheetBehavior.from(yourBottomSheet);
sheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
#Override
public void onStateChanged(#NonNull View bottomSheet, int newState) {
switch (newState) {
case BottomSheetBehavior.STATE_HIDDEN:
mFloatingActionButton.show();
case BottomSheetBehavior.STATE_EXPANDED: {
mFloatingActionButton.hide();
}
break;
case BottomSheetBehavior.STATE_COLLAPSED: {
mFloatingActionButton.show();
}
}
}

Can't Change Toolbar Color From Different Class

I am trying to change toolbar color from different class, but always failed. I don't know, what's wrong?
I've tried to do this using LayoutInflater but still failed. Can you help me to solve this issue?
LoadColor.java
public class LoadColor {
private Context context;
private HomeActivity hA;
final String KEY_SAVED_RADIO_BUTTON_INDEX = "SAVED_RADIO_BUTTON_INDEX";
public LoadColor(Context context) {
this.context = context;
}
public void LoadPreferences(){
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View contentView = inflater.inflate(R.layout.activity_settings, null,false);
LayoutInflater tiup = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View homeAct = tiup.inflate(R.layout.activity_home, null,false);
Toolbar tb = (Toolbar) homeAct.findViewById(R.id.toolbarHome);
RadioGroup radioGroup = (RadioGroup) contentView.findViewById(R.id.radioSex);
SharedPreferences sharedPreferences = context.getSharedPreferences("MY_SHARED_PREF", MODE_PRIVATE);
int savedRadioIndex = sharedPreferences.getInt(KEY_SAVED_RADIO_BUTTON_INDEX, 0);
RadioButton savedCheckedRadioButton = (RadioButton) radioGroup.getChildAt(savedRadioIndex);
savedCheckedRadioButton.setChecked(true);
RadioGroup genderGroup = (RadioGroup) contentView.findViewById(R.id.radioSex);
RadioButton male = (RadioButton) contentView.findViewById(R.id.theme1);
RadioButton female = (RadioButton) contentView.findViewById(R.id.theme2);
if (genderGroup.getCheckedRadioButtonId() == -1) {
hA = new HomeActivity();
hA.setToolbarColor(tb, context.getResources().getColor(R.color.colorPrimary));
}
else {
if (male.isChecked()) { // one of the radio buttons is checked
hA = new HomeActivity();
hA.setToolbarColor(tb, context.getResources().getColor(R.color.colorPrimary));
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
((Activity) context).getWindow().setStatusBarColor(Color.parseColor("#014a53"));
}
}
else if (female.isChecked()) {
hA = new HomeActivity();
hA.setToolbarColor(tb, context.getResources().getColor(R.color.colorAccent));
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
((Activity) context).getWindow().setStatusBarColor(Color.parseColor("#db503d"));
}
}
}
}
}
activity_home.xml
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbarHome"
android:layout_width="match_parent"
android:layout_height="64dp"
app:popupTheme="#style/AppTheme.PopupOverlay"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
</android.support.design.widget.AppBarLayout>
HomeActivity.java
private LoadColor Lc;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
//toolbar logo and desc
Toolbar topToolBar = (Toolbar)findViewById(R.id.toolbarHome);
setSupportActionBar(topToolBar); //munculkan menu ke toolbar
topToolBar.setLogo(R.mipmap.ikon);
topToolBar.setLogoDescription(getResources().getString(R.string.logo_desc));
Lc = new LoadColor(this);
Lc.LoadPreferences();
} //OnCreate
public static void setToolbarColor(Toolbar toolbar, #ColorInt int color) {
toolbar.setBackgroundColor(color);
}
You can see the setStatusBarColor code in LoadColor.java it's work, but in the toolbar setBackgroundColor it doesn't work.

Inside your onCreate or wherever you want to change the toolbar color you may call this static utility function and pass it the reference of the toolbar for which you want to change the background. This of course happens after you have identified which color you want to use for the background.
//Tools.java
public static void setToolbarColor(Toolbar toolbar, #ColorInt int color) {
toolbar.setBackgroundColor(color);
}
For example:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
//toolbar logo and desc
Toolbar topToolBar = (Toolbar)findViewById(R.id.toolbarHome);
setSupportActionBar(topToolBar); //munculkan menu ke toolbar
topToolBar.setLogo(R.mipmap.ikon);
topToolBar.setLogoDescription(getResources().getString(R.string.logo_desc));
//determine which color you want to use for the toolbar's background here
//you may use a local method to do that and return the resource value
//it can be an int resource or it can simply be a stored resource.
Tools.setToolbarColor(toolbar,getResources().getColor(R.color.colorPrimary));
//you can also parse the color from a string
setToolbarColor(topToolBar, Color.parse("RED"));
} //OnCreate

java.lang.IllegalArgumentException: DrawerLayout must be measured with MeasureSpec.EXACTLY

I searched a lot of questions , but none of the answers helped me ! I connected an activity with a navigation drawer to a fragment ... but I start from this mistake ! Thanks for your help!
java.lang.IllegalArgumentException: DrawerLayout must be measured with MeasureSpec.EXACTLY.
xml class
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="end"
android:background="#color/colorAccent">
<include
layout="#layout/app_bar_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!-- The main content view -->
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="80dp"
/>
<!-- The navigation drawer -->
<ListView
android:id="#+id/drawer_list"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="right"
android:background="#111"
android:choiceMode="singleChoice"
android:divider="#android:color/transparent"
android:dividerHeight="0dp"
android:paddingTop="80dp"/>
</android.support.v4.widget.DrawerLayout>
hedline fragment
public class HeadlinesFragment extends ListFragment {
String[] Headlines = {
"Article One",
"Article Two",
"Article 3",
"Article 4",
"Article 5",
"Article 6",
};
SearchView search_view;
OnHeadlineSelectedListener mCallback;
String[] menutitles;
TypedArray menuIcons;
CustomAdapter adapter;
private List<RowItem> rowItems;
// The container Activity must implement this interface so the frag can deliver messages
public interface OnHeadlineSelectedListener {
/** Called by HeadlinesFragment when a list item is selected */
public void onArticleSelected(int position);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// We need to use a different list item layout for devices older than Honeycomb
int layout = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ?
android.R.layout.simple_list_item_activated_1 : android.R.layout.simple_list_item_1;
return inflater.inflate(R.layout.list_fragment, null, false);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
menutitles = getResources().getStringArray(R.array.titles);
menuIcons = getResources().obtainTypedArray(R.array.icons);
rowItems = new ArrayList<RowItem>();
for (int i = 0; i < menutitles.length; i++) {
RowItem items = new RowItem(menutitles[i], menuIcons.getResourceId(
i, -1));
rowItems.add(items);
}
adapter = new CustomAdapter(getActivity(), rowItems);
setListAdapter(adapter);
}
#Override
public void onStart() {
super.onStart();
// When in two-pane layout, set the listview to highlight the selected list item
// (We do this during onStart because at the point the listview is available.)
if (getFragmentManager().findFragmentById(R.id.article_fragment) != null) {
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
}
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
// This makes sure that the container activity has implemented
// the callback interface. If not, it throws an exception.
try {
mCallback = (OnHeadlineSelectedListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnHeadlineSelectedListener");
}
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
// Notify the parent activity of selected item
mCallback.onArticleSelected(position);
// Set the item as checked to be highlighted when in two-pane layout
getListView().setItemChecked(position, true);
}
}
main activity of fragment`
public class MainActivity_list extends FragmentActivity
implements HeadlinesFragment.OnHeadlineSelectedListener {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.news_articles);
// Check whether the activity is using the layout version with
// the fragment_container FrameLayout. If so, we must add the first fragment
if (findViewById(R.id.fragment_container) != null) {
// However, if we're being restored from a previous state,
// then we don't need to do anything and should return or else
// we could end up with overlapping fragments.
if (savedInstanceState != null) {
return;
}
// Create an instance of ExampleFragment
HeadlinesFragment firstFragment = new HeadlinesFragment();
// In case this activity was started with special instructions from an Intent,
// pass the Intent's extras to the fragment as arguments
firstFragment.setArguments(getIntent().getExtras());
// Add the fragment to the 'fragment_container' FrameLayout
getSupportFragmentManager().beginTransaction()
.add(R.id.fragment_container, firstFragment).commit();
}
}
public void onArticleSelected(int position) {
// The user selected the headline of an article from the HeadlinesFragment
// Capture the article fragment from the activity layout
ArticleFragment articleFrag = (ArticleFragment)
getSupportFragmentManager().findFragmentById(R.id.article_fragment);
if (articleFrag != null) {
// If article frag is available, we're in two-pane layout...
// Call a method in the ArticleFragment to update its content
articleFrag.updateArticleView(position);
} else {
// If the frag is not available, we're in the one-pane layout and must swap frags...
// Create fragment and give it an argument for the selected article
ArticleFragment newFragment = new ArticleFragment();
Bundle args = new Bundle();
args.putInt(ArticleFragment.ARG_POSITION, position);
newFragment.setArguments(args);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack so the user can navigate back
transaction.replace(R.id.fragment_container, newFragment);
transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}
}
}
article fragment.java
public class ArticleFragment extends Fragment {
final static String ARG_POSITION = "position";
int mCurrentPosition = -1;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// If activity recreated (such as from screen rotate), restore
// the previous article selection set by onSaveInstanceState().
// This is primarily necessary when in the two-pane layout.
if (savedInstanceState != null) {
mCurrentPosition = savedInstanceState.getInt(ARG_POSITION);
}
// Inflate the layout for this fragment
return inflater.inflate(R.layout.activity_main, container, false);
}
#Override
public void onStart() {
super.onStart();
// During startup, check if there are arguments passed to the fragment.
// onStart is a good place to do this because the layout has already been
// applied to the fragment at this point so we can safely call the method
// below that sets the article text.
Bundle args = getArguments();
if (args != null) {
// Set article based on argument passed in
updateArticleView(args.getInt(ARG_POSITION));
} else if (mCurrentPosition != -1) {
// Set article based on saved instance state defined during onCreateView
updateArticleView(mCurrentPosition);
}
}
public void updateArticleView(int position) {
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
// Save the current article selection in case we need to recreate the fragment
outState.putInt(ARG_POSITION, mCurrentPosition);
}
}
mainactivity.java (of navgation drawer)
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
String[] lista = {
"Article One",
"Article Two",
"Article 3",
"Article 4",
"Article 5",
"Article 6",
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, R.string.navigation_drawer_open, R.string.navigation_drawer_close){
#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.btnMyMenu) {
if (drawer.isDrawerOpen(Gravity.RIGHT)) {
drawer.closeDrawer(Gravity.RIGHT);
} else {
drawer.openDrawer(Gravity.RIGHT);
}
return true;
}
return super.onOptionsItemSelected(item);
}
};
drawer.setDrawerListener(toggle);
toggle.syncState();
Button btn=(Button) findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (drawer.isDrawerOpen(Gravity.RIGHT)) {
drawer.closeDrawer(Gravity.RIGHT);
} else {
drawer.openDrawer(Gravity.RIGHT);
}
}
});
ListView lv = (ListView) findViewById(R.id.drawer_list);
// Convert ArrayList to array
lv.setAdapter(new ArrayAdapter<String>(this, R.layout.list_menu,R.id.menu_text, lista));
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
switch (position) {
case 0:
Intent activity0 = new Intent(MainActivity.this, pagina1.class);
startActivity(activity0);
break;
case 1:
Intent activity1 = new Intent(MainActivity.this, pagina1.class);
startActivity(activity1);
break;
}
}
#SuppressWarnings("unused")
public void onClick(View v) {
}
;
});
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(Gravity.RIGHT)) {
drawer.closeDrawer(Gravity.RIGHT);
} else {
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
int menuToUse = R.menu.my_right_side_menu;
MenuInflater inflater = getMenuInflater();
inflater.inflate(menuToUse, menu);
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} 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) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(Gravity.RIGHT);
return true;
}
}
there is also a rowitem.java, customadapeter.java
app_bar.xml
<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.chiari.nicola.myapplication.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_main" />
</android.support.design.widget.CoordinatorLayout>
content_main.xml
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="com.chiari.nicola.myapplication.MainActivity"
tools:showIn="#layout/app_bar_main">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button"/>
</RelativeLayout>

As the Error say: Change the DrawerLayout width to some definite value like 240dp instead of match_parent
See the source Code:
if (widthMode != MeasureSpec.EXACTLY || heightMode != MeasureSpec.EXACTLY) {
if (isInEditMode()) {
// Don't crash the layout editor. Consume all of the space if specified
// or pick a magic number from thin air otherwise.
// TODO Better communication with tools of this bogus state.
// It will crash on a real device.
if (widthMode == MeasureSpec.AT_MOST) {
widthMode = MeasureSpec.EXACTLY;
} else if (widthMode == MeasureSpec.UNSPECIFIED) {
widthMode = MeasureSpec.EXACTLY;
widthSize = 300;
}
if (heightMode == MeasureSpec.AT_MOST) {
heightMode = MeasureSpec.EXACTLY;
}
else if (heightMode == MeasureSpec.UNSPECIFIED) {
heightMode = MeasureSpec.EXACTLY;
heightSize = 300;
}
} else {
throw new IllegalArgumentException(
"DrawerLayout must be measured with MeasureSpec.EXACTLY.");
}
}

I had a similar issue, during investigation I discovered that it was because HorizontalScrollVIew was in my view hierarchy, try to play with that

Passing data between two tab fragments in a SlidingTabslayout

I have an application which has one main activity which in turn hosts two tabs. Each tab is a fragment. The first tab has an editText and a Button and on button press the text entered by the user must be displayed on the second tab fragment which hosts only one textView. I am using a listener to pass the data but for some reason the app crashes when i press the submit button. Any help would be appreciated. Here is my code:
MainActivity.java
public class MainActivity extends AppCompatActivity implements OnEditTextListener {
Toolbar toolbar;
ViewPager pager;
ViewPagerAdapter adapter;
SlidingTabLayout tabs;
CharSequence Titles[] = {"Home", "Events"};
int Numboftabs = 2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Creating The Toolbar and setting it as the Toolbar for the activity
toolbar = (Toolbar) findViewById(R.id.tool_bar);
setSupportActionBar(toolbar);
// Creating The ViewPagerAdapter and Passing Fragment Manager, Titles fot the Tabs and Number Of Tabs.
adapter = new ViewPagerAdapter(getSupportFragmentManager(), Titles, Numboftabs);
// Assigning ViewPager View and setting the adapter
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
// Assiging the Sliding Tab Layout View
tabs = (SlidingTabLayout) findViewById(R.id.tabs);
tabs.setDistributeEvenly(true); // To make the Tabs Fixed set this true, This makes the tabs Space Evenly in Available width
// Setting Custom Color for the Scroll bar indicator of the Tab View
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
#Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.ColorPrimary);
}
});
// Setting the ViewPager For the SlidingTabsLayout
tabs.setViewPager(pager);
}
#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 OnEditText(String data) {
Tab2 newFragment = (Tab2)adapter.getItem(1);
newFragment.updateDisplay(data);
}
}
Tab1.java
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.text.Editable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
public class Tab1 extends Fragment
{
public interface OnEditTextListener {
public void OnEditText(String data);
}
OnEditTextListener editTextListener = null;
EditText edtText;
Button btnSubmit;
String val;
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
editTextListener = (OnEditTextListener) activity;
} catch (ClassCastException ex) {
ex.printStackTrace();
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.first_fragment, container, false);
return v;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
edtText = (EditText)getActivity().findViewById(R.id.edtText);
btnSubmit = (Button)getActivity().findViewById(R.id.btnSubmit);
btnSubmit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
val = edtText.getText().toString();
editTextListener.OnEditText(val);
}
});
}
}
Tab2.java
public class Tab2 extends Fragment {
public static final String TAG = "DATA";
public static final String SAVE = "NBHJB";
String newdata = "";
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (savedInstanceState != null)
savedInstanceState.getInt(SAVE);
return inflater.inflate(R.layout.second_fragment, container, false);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (savedInstanceState != null) {
savedInstanceState.getString(SAVE);
}
}
public void updateDisplay(String data) {
newdata = data;
TextView randomData = (TextView) getActivity().findViewById(R.id.txtView1);
randomData.setText(newdata);
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putString(SAVE, newdata);
}
MainActivity.xml
<LinearLayout 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:orientation="vertical"
tools:context=".MainActivity">
<include
android:id="#+id/tool_bar"
layout="#layout/tool_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<View
android:layout_height="2dip"
android:background="#color/tabsScrollColor"
android:layout_width="wrap_content" />
<com.example.regi.tabsprove.SlidingTabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/prove"
android:elevation="2dp" />
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"></android.support.v4.view.ViewPager>
</LinearLayout>
second_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:id="#+id/txtView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:padding="10dp"
android:text="Default Text"
android:textSize="20dp" />
</LinearLayout>
This is the error that I get
java.lang.NullPointerException
at com.example.regi.tabsprove.Tab2.updateDisplay(Tab2.java:36)
at com.example.regi.tabsprove.MainActivity.OnEditText(MainActivity.java:79)
at com.example.regi.tabsprove.Tab1$1.onClick(Tab1.java:51)
at android.view.View.performClick(View.java:4198)
at android.view.View$PerformClick.run(View.java:17158)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4918)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771)
at dalvik.system.NativeStart.main(Native Method)

I'm pretty sure that the line Tab2 newFragment = (Tab2)adapter.getItem(1); is creating a new instance of Tab2 instead of giving you the Fragment that you need. You should find a better way to get the instance of the Fragment that has been built to you by the ViewPager; I'm sure that this post can help you.

I found your design a bit complicated than regular data passing. From the logs, the issue is the program unable to find txtView1 in second fragment. It is always a good practice to use bundle for passing data.
I hope the following changes should fix your problem, but that's not the best way to do it.
Declare your TextView next to newData
public static final String TAG = "DATA";
public static final String SAVE = "NBHJB";
String newdata = "";
TextView randomData;
Initialize it in onCreateView()
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (savedInstanceState != null)
savedInstanceState.getInt(SAVE);
View rootView = inflater.inflate(R.layout.second_fragment, container, false);
randomData = (TextView) rootView.findViewById(R.id.txtView1);
return rootView;
}
Change the updateDisplay function
public void updateDisplay(String data) {
newdata = data;
randomData.setText(newdata);
}
Make sure you dont have any other items with same id as txtView1.

Here is the solution to everyone who might be facing the same issue:
public static String makeFragmentName(int containerViewId, long id) {
return "android:switcher:" + containerViewId + ":" + id;
}
public #Nullable
Fragment getFragmentForPosition(int position)
{
String tag = makeFragmentName(pager.getId(), position);
Fragment fragment = getSupportFragmentManager().findFragmentByTag(tag);
return fragment;
}
#Override
public void OnEditText(String data) {
Tab2 tab2 = (Tab2)getFragmentForPosition(1);
tab2.updateDisplay(data);
}
This code goes to MainActivity.java

Android: Navigation-Drawer on all activities

I want to add navigation drawer on all actvities of my Android project. This is the code of the MainActivity:
public class MainActivity extends Activity {
private String[] drawerListViewItems;
private DrawerLayout drawerLayout;
private ListView drawerListView;
private ActionBarDrawerToggle actionBarDrawerToggle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// get list items from strings.xml
drawerListViewItems = getResources().getStringArray(R.array.items);
// get ListView defined in activity_main.xml
drawerListView = (ListView) findViewById(R.id.left_drawer);
// Set the adapter for the list view
drawerListView.setAdapter(new ArrayAdapter<String>(this,
R.layout.drawer_listview_item, drawerListViewItems));
// App Icon
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
//drawerLayout = (DrawerLayout) findViewById(R.drawable.ic_drawer_2);
actionBarDrawerToggle = new ActionBarDrawerToggle(
this, /* host Activity */
drawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer icon to replace 'Up' caret */
R.string.drawer_open, /* "open drawer" description */
R.string.drawer_close /* "close drawer" description */
);
// Set actionBarDrawerToggle as the DrawerListener
drawerLayout.setDrawerListener(actionBarDrawerToggle);
getActionBar().setDisplayHomeAsUpEnabled(true);
// just styling option add shadow the right edge of the drawer
drawerLayout.setDrawerShadow(R.drawable.ic_drawer, GravityCompat.START);
drawerListView.setOnItemClickListener(new DrawerItemClickListener());
}
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
actionBarDrawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
actionBarDrawerToggle.onConfigurationChanged(newConfig);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// call ActionBarDrawerToggle.onOptionsItemSelected(), if it returns true
// then it has handled the app icon touch event
if (actionBarDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
return super.onOptionsItemSelected(item);
}
private class DrawerItemClickListener implements ListView.OnItemClickListener {
#Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
displayView(position);
drawerLayout.closeDrawer(drawerListView);
}
private void displayView(int position)
{
switch (position)
{
case 0:
secondactivity();
break;
case 1:
Toast.makeText(MainActivity.this, "2", Toast.LENGTH_LONG).show();
break;
case 2:
Toast.makeText(MainActivity.this, "3", Toast.LENGTH_LONG).show();
default:
break;
}
}
}
public void secondactivity (){
Intent cambioActivity;
cambioActivity = new Intent (this, SecondActivity.class);
startActivity(cambioActivity);
}
}
In this code I create the navigation drawer, I want the navigation drawer on all activities, so my Second Activity's code is this:
public class SecondActivity extends MainActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_secondactivity);
}
The navigation drawer is on the first activity but there isn't on other activities, why? Can someone help me?

The easy way is that you should create fragments. If you are ready to for little hard thing then this is for you. It will let you have same navigation drawer in all activities.
Create drawer_n_activity.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<FrameLayout
android:id="#+id/drawer_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<YourDrawer
android:id="#+id/drawer_drawer"
android:layout_width="match_parent"
android:layout_height="fill_parent" >
</YourDrawer>
</RelativeLayout>
Your DrawerActivity.class
public class DrawerActivity extends Activity {
public RelativeLayout fullLayout;
public FrameLayout frameLayout;
#Override
public void setContentView(int layoutResID) {
fullLayout = (RelativeLayout) getLayoutInflater().inflate(R.layout.drawer_n_activity, null);
frameLayout = (FrameLayout) fullLayout.findViewById(R.id.drawer_frame);
getLayoutInflater().inflate(layoutResID, frameLayout, true);
super.setContentView(fullLayout);
//Your drawer content...
}
}
Now, to include same Navigation Drawer in all your activities and mind one more thing, all your activities must extend DrawerActivity
public class MainActivity extends DrawerActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); //layout for 1st activity
}
}
public class SecondActivity extends DrawerActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second_activity); //layout for 2nd activity
}
}

Okay Guys will share my way I do it (in case you are developing project after somebody and there is already tons of activities).
Finally I inflate navigation drawer with one line of code (in onCreate):
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mContext = this; //context
//setContentView(R.layout.activity_favorites); // Was so
Utils.inflatedNavigationDrawerView(mContext, R.layout.activity_favorites); // Now is
//...
}
next what is Utils? :
public class Utils{
public static void inflatedNavigationDrawerView(Context context, int layoutId){
// Here get view of clear DrawerLayout
final View drawerLayout = View.inflate(context,R.layout.navigation_drawer_inflator, null);
// Next inflate to it passed layout for activity
final View mainLayout = View.inflate(context,layoutId, (ViewGroup) drawerLayout);
// And finally inflate to it fragment for NavigationDraver
final View fragmentLayout = View.inflate(context,R.layout.navigation_drawer_inflator_fragment, (ViewGroup) drawerLayout);
// Next we should try to get our drawer (should check with casting to each activity you want to insert to)
NavigationDrawerFragment drawerFragment = null;
// this block should be repeated for each activity you want to use in.
if (context instanceof FavoritesActivity){
// Set our pack of inflates to contentview
((FavoritesActivity) context).setContentView(mainLayout);
// And now we get NavigationDrawerFragment
drawerFragment = (NavigationDrawerFragment)
((FavoritesActivity) context).getSupportFragmentManager().findFragmentById(R.id.navigation_drawer_fragment);
}
if(drawerFragment != null){ // if null then we missed some castings for activity used in.
// Finally setup our drawer
drawerFragment.setUpEasy(R.id.navigation_drawer_fragment, (DrawerLayout)drawerLayout.findViewById(R.id.drawer_layout), (Toolbar) mainLayout.findViewById(R.id.app_bar));
}
}
}
If you would like to avoid creation of hamburger in Toolbar then you shoud in setUpEasy place: mDrawerToggle.setDrawerIndicatorEnabled(false);
Here is my sample of setup:
public void setUpEasy(int fragmentId, DrawerLayout drawerLayout, Toolbar toolBar) {
mContainerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
mDrawerToggle = new ActionBarDrawerToggle(getActivity(), drawerLayout, toolBar, R.string.open, R.string.close){
#Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
if(!mUserLearnedDrawer){
mUserLearnedDrawer = true;
saveToPreferences(getActivity(), Constants.PREFERENCES_LEARNDRAWER_KEY, mUserLearnedDrawer+"");
}
}
#Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
}
};
mDrawerToggle.setDrawerIndicatorEnabled(false); // If false then no hamburger menu.
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerLayout.post(new Runnable() {
#Override
public void run() {
mDrawerToggle.syncState();
}
});
}
and views used:
// navigation_drawer_inflator.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:dragAndDrop="http://schemas.android.com/apk/res-auto"
android:id="#+id/drawer_layout"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.widget.DrawerLayout>
// navigation_drawer_inflator_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/navigation_drawer_fragment"
android:layout_width="#dimen/navigation_drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start"
android:layout_marginTop="56dp"
app:layout="#layout/fragment_navigation_drawer"
tools:layout="#layout/fragment_navigation_drawer" />
Finally if you will implement this - You will be able to insert navigation drawer to any activity on run. Cheers :)

Here's how I did it. Create the helper class. I also added some optional code for the ability to finish() the class.
public class NavDrawerHelper extends ContextWrapper{
public NavDrawerHelper(Context context){
super(context);
}
public void initNav(final DrawerLayout drawerLayout, NavigationView navigationView, Toolbar toolbar, final boolean isFinish){
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem menuItem) {
int id = menuItem.getItemId();
switch (id){
case R.id.nav_home:
startActivity(new Intent(getBaseContext(), MainActivity.class));
if (isFinish) ((Activity)getBaseContext()).finish();
drawerLayout.closeDrawers();
break;
case R.id.nav_settings:
startActivity(new Intent(getBaseContext(), SettingsActivity.class));
if (isFinish) ((Activity)getBaseContext()).finish();
drawerLayout.closeDrawers();
break;
}
return true;
}
});
ActionBarDrawerToggle actionBarDrawerToggle = new ActionBarDrawerToggle(((Activity)getBaseContext()),drawerLayout,toolbar,R.string.drawer_open,R.string.drawer_close){
#Override
public void onDrawerClosed(View v){
super.onDrawerClosed(v);
}
#Override
public void onDrawerOpened(View v) {
super.onDrawerOpened(v);
}
};
drawerLayout.addDrawerListener(actionBarDrawerToggle);
actionBarDrawerToggle.syncState();
}
}
then add this code to all activities. This replaces your existing initNavigationDrawer() method.
public void initNavigationDrawer() {
//views
NavigationView navigationView = findViewById(R.id.navigation_view);
DrawerLayout drawerLayout = findViewById(R.id.drawer);
NavDrawerHelper navDrawerHelper = new NavDrawerHelper(this);
navDrawerHelper.initNav(drawerLayout, navigationView, toolbar, false);
}