Develop Reference

Bottom Sheet is not getting overlayed on bottom App bar

I have made an bottom app bar app with fab and bottom sheet and I have implemented the state expanded and state hidden from navigation on item selected listener.The question is how to make bottom sheet overlay on bottom app bar the following result I have got is.
This is main activity xml
<?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"
android:id="#+id/activity_CoordinatorLayout"
android:layout_width="match_parent"
android:background="#FFB7B7B7"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"/>
</com.google.android.material.appbar.AppBarLayout>
<com.google.android.material.bottomappbar.BottomAppBar
android:id="#+id/bottom_app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="#style/Widget.MaterialComponents.BottomAppBar.Colored"
android:layout_gravity="bottom"
android:elevation="26dp"
app:navigationIcon="#drawable/ic_menu_black" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:layout_width="wrap_content"
android:elevation="26dp"
android:layout_height="wrap_content"
app:srcCompat="#android:drawable/ic_menu_add"
app:layout_anchor="#id/bottom_app_bar"
app:menu="#menu/menu_demo"
/>
<FrameLayout
android:id="#+id/bottom_drawer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="16dp"
android:visibility="visible"
app:behavior_hideable="true"
app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior">
<com.google.android.material.navigation.NavigationView
android:id="#+id/navigation_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:menu="#menu/menu_demo" />
</FrameLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Main activity class
package com.bab.BottomAppBar;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import com.google.android.material.bottomappbar.BottomAppBar;
import com.google.android.material.bottomsheet.BottomSheetBehavior;
import android.view.View;
import com.google.android.material.navigation.NavigationView;
import androidx.coordinatorlayout.widget.CoordinatorLayout;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
BottomAppBar bab;
BottomSheetBehavior<View> bsb;
CoordinatorLayout cl;
NavigationView nv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar=(Toolbar)findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
nv=findViewById(R.id.navigation_view);
cl=findViewById(R.id.activity_CoordinatorLayout);
View bottomDrawer=cl.findViewById(R.id.bottom_drawer);
bab=findViewById(R.id.bottom_app_bar);
bsb=BottomSheetBehavior.from(bottomDrawer);
bsb.setState(BottomSheetBehavior.STATE_HIDDEN);
bab.setNavigationIcon(R.drawable.ic_menu_black);
bab.replaceMenu(R.menu.menu_demo);
bab.setNavigationOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View p1) {
bsb.setState(BottomSheetBehavior.STATE_HALF_EXPANDED);
}
});
nv.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener(){
#Override
public boolean onNavigationItemSelected(MenuItem p1) {
return false;
}
});
}
#Override
public void onBackPressed() {
super.onBackPressed();
bsb.setState(BottomSheetBehavior.STATE_HIDDEN);
}
}
Result I got:
This is the result
Result I wanted:
See in this the frame layout as bottom sheet is overlaying on bottom app bar
Someone please help me

You need to set BottomSheet's elevation more than BottomAppBar's.
Elevation means how your views lay above each other

How to access a Button inside a Toolbar in Android

I'm pretty new to coding so I might not express myself correctly, please bear with me.
I have a fragment inflated inside a layout that includes a toolbar. When I open the fragment, I want to add a button (not a menu, just a button to navigate to another fragment).
My issue is I don't know how to instantiate the button from my Fragment class to add an icon and an onClickListener.
Here's my xml files:
The layout that contains my fragment:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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="be.ac.ulg.mobulis.Activities.MainActivity"
android:orientation="vertical">
<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="#color/blue"
app:popupTheme="#style/AppTheme.PopupOverlay" >
<Button
android:id="#+id/toolbar_button"
android:layout_width="#dimen/margin"
android:layout_height="#dimen/margin"
android:layout_gravity="right"
android:layout_marginRight="#dimen/innerLargeMargin"
/>
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_main" />
</LinearLayout>
The layout in which the fragment is inflated:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:design="http://schemas.android.com/apk/res-auto"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="be.ac.ulg.mobulis.Activities.MainActivity"
tools:showIn="#layout/app_bar_main"
android:background="#color/orange">
<FrameLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="#f1f1f1">
</FrameLayout>
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="start"
design:menu="#menu/bottom_nav_items"
android:background="#color/orange"
android:backgroundTint="#color/white"
design:itemIconTint="#color/white"
design:itemTextColor="#color/white"
design:itemBackground="#drawable/bottom_bar_tint_selector"
/>
</LinearLayout>
So what I want to do is something like
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
toolBarButton = (???).findViewById(R.id.toolbar_button)
}

activity_main.xml to add Button inside android.support.v7.widget.Toolbar
<?xml version="1.0" encoding="utf-8"?>
<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:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="56dp"
android:background="#FFA000">
<Button
android:id="#+id/toolbarbtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
android:layout_gravity="right"/>
</android.support.v7.widget.Toolbar>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
</LinearLayout>
MainActivity.java
import android.os.Bundle;
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.Button;
import android.widget.Toast;
import android.os.Bundle;
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.Button;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
Button toolBarBtn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("Toolbar with button example");
toolbar.setSubtitle("Toolbar subtitle");
toolbar.setLogo(android.R.drawable.ic_menu_info_details);
toolBarBtn = (Button)findViewById(R.id.toolbarbtn);
toolBarBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getBaseContext(),
"Button in ToolBar clicked",
Toast.LENGTH_LONG).show();
}
});
}
}

Set This onClick Listener in your parent activity of Fragment.

try this to access your button of toolbar from activity
private Toolbar toolbar;
toolbar = (Toolbar) findViewById(R.id.ar_toolbar);
Button toolbar_button = (Button) toolbar.findViewById(R.id.toolbar_button);
setSupportActionBar(toolbar);
toolbar_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(ChatActivity.this, "Clicked", Toast.LENGTH_SHORT).show();
}
});

you have to write like below
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
toolBarButton = (Button) view.findViewById(R.id.toolbar_button);
where view is your view which you bind at your onCreateView in your Fragment.

What I do is to bind the View inside the activity and then create an interface who works with that View.
public class Activity implements ButtonListener{
//findViewbyId or Butterknife
void doSomething(){
toolBarButton.something()
}
Interface
}
public interface ButtonListener{
void doSomething();
}
Fragment
public class Fragment extends Fragment{
public ButtonListener mButton;
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
mButton = (ButtonListener)getActivity();
super.onCreate(savedInstanceState);
}
}

You can access button directly without toolbar using (Button) findViewById(R.id.toolbar_button).
Toolbar toolbar = (Toolbar) findViewById(R.id.ar_toolbar);
Button toolbar_button = (Button) findViewById(R.id.toolbar_button);
setSupportActionBar(toolbar);

Scrolling to view in CoordinatorLayout shows only partially the view

I have made an Android app containing a CoordinatorLayout with a AppBar and a NestedScrollView. In my NestedScrollView I have a list of items, and a button which scroll to an item in my NestedScrollView.
When clicking the button, the Android app scroll down to the item, but doesn't show the whole item, only partially: http://i.stack.imgur.com/8kuq0.png
I expected something like the following: http://i.stack.imgur.com/k0A5N.png
It seems like the amount the app needs to scroll is about the same size as the AppBar, in order to show the whole view. If I remove the scroll flag in my layout file below, I get the expected behavior.
What do I do wrong?
Update (12/01/2016): I've updated the pictures, so they are bigger. Furthermore as I wrote in Herry's response, I'm in doubt if View.requestRectangleOnScreen() is the right method to call, or if I should use a different layout then NestedScrollView.
My activity is coded as follows:
package com.example.sij.coordinatorlayoutbug;
import android.graphics.Rect;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
TextView itemToNavigateTo;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
itemToNavigateTo = (TextView)findViewById(R.id.itemToNavigateTo);
Button navigatorButton = (Button)findViewById(R.id.navigator_button);
navigatorButton.setOnClickListener(navigateToItemListener());
}
View.OnClickListener navigateToItemListener() {
return new View.OnClickListener() {
#Override
public void onClick(final View v) {
new Handler(Looper.getMainLooper()).post(new Runnable() {
#Override
public void run() {
itemToNavigateTo.requestRectangleOnScreen(
new Rect(
0,
0,
itemToNavigateTo.getWidth(),
itemToNavigateTo.getHeight()));
}
});
}
};
}
}
And the layout file:
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="#+id/navigator_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/scroll_to_item" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/item1"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/lorem_ipsum"
android:paddingBottom="20dp"/>
<!-- Items 2 to 5 omitted for brevity -->
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/item6"/>
<TextView
android:id="#+id/itemToNavigateTo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/lorem_ipsum"
android:paddingBottom="20dp"/>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

you need to add android:fillviewport="true" in your
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:fillViewport="true">

how to hide header and footer on scroll in android

there is two LinearLayouts header and footer in main activity
also RecyclerView inside swipeRefreshLayout between them
now i want to hide header and footer with use LayoutParam, but it shows gap after changing layoutParam and swipeRefreshLayout's height doesn't changes.
how to fix it?

I have try to solve your problem use the demo.
the xml file
<?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:background="#fff"
android:orientation="vertical">
<View
android:layout_width="match_parent"
android:layout_height="50dp"
android:onClick="click"
android:background="#fffe4a" />
<View
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:layout_marginTop="2dp"
android:background="#3489ff" />
<View
android:id="#+id/view_bottom"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#fffe4a" />
</LinearLayout>
the java file.
package com.example.wangze.instantdemo1;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.LinearLayout;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void click(View view){
View view_bottom = findViewById(R.id.view_bottom);
LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) view_bottom.getLayoutParams();
layoutParams.height = 20;
view_bottom.setLayoutParams(layoutParams);
}
}
When i click the top view. The bottom is smaller,and not have gap. Maybe it can help you.

Android ImageButton ClickEvent not working

here is the code, please can anyone simply tell me how to make the onClick event run?
xml file of the activity, which has a navigation-drawer fragment, An Image view, A TextView, An ImageButton
<?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:orientation="vertical">
<include
android:id="#+id/app_bar"
layout="#layout/app_bar" />
<ImageView
android:id="#+id/imageView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignTop="#+id/drawer_layout"
android:adjustViewBounds="true"
android:contentDescription="#string/ContentDescriptionProfileImage"
android:src="#drawable/profile_pic" />
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/imageView"
android:background="#FFFFFF"
android:orientation="horizontal"
android:padding="5dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="45dp">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_gravity="center_vertical"
android:padding="3dp"
android:text="#string/profileName"
android:textColor="#000000"
android:textSize="18sp"
android:textStyle="bold" />
<ImageButton
android:id="#+id/profileSettings"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:background="#null"
android:contentDescription="#string/settingsIconDescription"
android:padding="8dp"
android:onClick="onSettingsIconPressed"
android:src="#drawable/settings32" />
</RelativeLayout>
</LinearLayout>
<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_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="#+id/app_bar">
<fragment
android:id="#+id/fragment_navigation_drawer"
android:name="studio25.materialdesign.NavigationDrawerFragment"
android:layout_width="280dp"
android:layout_height="match_parent"
android:layout_gravity="start"
app:layout="#layout/fragment_navigation_drawer"
tools:layout="#layout/fragment_navigation_drawer"></fragment>
</android.support.v4.widget.DrawerLayout>
</RelativeLayout>
The image of the Screen Looks like this
here is the activity class
package studio25.materialdesign;
import android.annotation.TargetApi;
import android.os.Build;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.support.v7.widget.PopupMenu;
import android.support.v7.widget.Toolbar;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageButton;
import android.widget.Toast;
public class ProfileView extends ActionBarActivity {
private Toolbar toolbar;
String title = "";
ImageButton setttingsButton;
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile_view);
toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
this.getSupportActionBar().setTitle(title);
getSupportActionBar().setDisplayShowHomeEnabled(true);
NavigationDrawerFragment drawerFragment = (NavigationDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
drawerFragment.setUp((DrawerLayout) findViewById(R.id.drawer_layout), toolbar);
setttingsButton= (ImageButton) findViewById(R.id.profileSettings);
/*
Window window = this.getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
window.setStatusBarColor(this.getResources().getColor(R.color.primaryColor));
*/
}
public void onSettingsIconPressed(View v)
{
/*
PopupMenu popupMenu=new PopupMenu(this,v);
MenuInflater inflater=getMenuInflater();
inflater.inflate(R.menu.profile_settings_popup_menu,popupMenu.getMenu());
popupMenu.show();
*/
Toast.makeText(this,"Event Click Occured",Toast.LENGTH_SHORT).show();
}
}
I basically wanted a menu popup on buttonclick, but on debugging realized that my button click is not itself working.
Some tutotials say for popUp menu , minSdkVersion should be 11, even changed that.
Nothing is helping me.
Is my xml erroneous or what?

I usually like to hook up my callbacks in code (just my personal preference).
setttingsButton= (ImageButton) findViewById(R.id.profileSettings);
setttingsButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(this,"clicked!",Toast.LENGTH_SHORT).show();
}
});
With this you can remove the onClick attribute in the xml layout.
If you want a popup window then PopupWindow is a great option.
popupWindow = new PopupWindow(some_view_to_show, ViewGroup.LayoutParams.MATCH_PARENT, (int)popupHeight, false);
...
popupWindow.showAtLocation(view_to_inject_into, Gravity.NO_GRAVITY, 0, (size.y) - (int) popupHeight);
then you call popupWindow.dismiss(); to remove the popup
Your issue could also be that since you are using a RelativeLayout each element gets "stacked" on top of each other so you have essentially "buried" your ImageButton that you want to click on. So in other words some other view is blocking or consuming your clicks.
Try moving your ImageButton to be one of the last elements that you add to the xml file so that it is "on top" of everything else so that it can be clicked.
Alternatively you can try making the containing LinearLayout clickable instead of the ImageButton. So you would move the android:onClick="onSettingsIconPressed" attribute to the LinearLayout that contains the ImageButton.