How to make the 'back-arrow' work in the toolbar?

How to make the 'back-arrow' work in the toolbar? - android

I have the following part of the xml code that defines my toolbar:
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:columnCount="5"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:useDefaultMargins="true"
android:alignmentMode="alignBounds"
android:columnOrderPreserved="false">
<android.support.v7.widget.Toolbar android:id="#+id/toolbar_setting"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"/>
... // other code here
and the code in the SettingsActivity (derived from AppCompatActivity) is as follows:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
// Set toolbar, allow going back.
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar_setting);
toolbar.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
}
});
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle("Settings");
When compiling and running the code I see a toolbar as follows:
but a click on the left-arrow does not get me back to the previous menu. What am I missing here?

You can access that little arrow by android.R.id.home :
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
onBackPressed();
return true;
}
return(super.onOptionsItemSelected(item));
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
If you try this code , when you click arrow, it will act like your back button pressed.

in onOptionsItemSelected you need to listen for the click then do something
case android.R.id.home:
// do something with the click
break;

As you need to go one level up, make the following changes in your AndroidManifest.xml.
<activity
android:name=".CurrentActivity"
android:parentActivityName=".OneLevelUpActivity">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".OneLevelUpActivity" />
</activity>
In onCreate() add toolbar.setHomeButtonEnabled(true);
The <meta-data> is to support earlier API versions (<API level 16).

Related

Back arrow in tool bar in order to go to previous activity [duplicate]

I'm migrating from ActionBar to Toolbar in my application.
But I don't know how to display and set click event on Back Arrow on Toolbar like I did on Actionbar.
With ActionBar, I call mActionbar.setDisplayHomeAsUpEnabled(true).
But there is no the similar method like this.
Has anyone ever faced this situation and somehow found a way to solve it?

If you are using an ActionBarActivity then you can tell Android to use the Toolbar as the ActionBar like so:
Toolbar toolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar);
setSupportActionBar(toolbar);
And then calls to
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
will work. You can also use that in Fragments that are attached to ActionBarActivities you can use it like this:
((ActionBarActivity) getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
((ActionBarActivity) getActivity()).getSupportActionBar().setDisplayShowHomeEnabled(true);
If you are not using ActionBarActivities or if you want to get the back arrow on a Toolbar that's not set as your SupportActionBar then you can use the following:
mActionBar.setNavigationIcon(getResources().getDrawable(R.drawable.ic_action_back));
mActionBar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//What to do on back clicked
}
});
If you are using android.support.v7.widget.Toolbar, then you should add the following code to your AppCompatActivity:
#Override
public boolean onSupportNavigateUp() {
onBackPressed();
return true;
}

I see a lot of answers but here is mine which is not mentioned before. It works from API 8+.
public class DetailActivity extends AppCompatActivity
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
// toolbar
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// add back arrow to toolbar
if (getSupportActionBar() != null){
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
}
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// handle arrow click here
if (item.getItemId() == android.R.id.home) {
finish(); // close this activity and return to preview activity (if there is any)
}
return super.onOptionsItemSelected(item);
}

There are many ways to achieve that, here is my favorite:
Layout:
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:navigationIcon="?attr/homeAsUpIndicator" />
Activity:
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// back button pressed
}
});

you can use the tool bar setNavigationIcon method.
Android Doc
mToolBar.setNavigationIcon(R.drawable.abc_ic_ab_back_mtrl_am_alpha);
mToolBar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
handleOnBackPress();
}
});

If you don't want to create a custom Toolbar, you can do like this
public class GalleryActivity extends AppCompatActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
...
getSupportActionBar().setTitle("Select Image");
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
finish();
}
return super.onOptionsItemSelected(item);
}
}
In you AndroidManifest.xml
<activity
android:name=".GalleryActivity"
android:theme="#style/Theme.AppCompat.Light">
</activity>
you can also put this android:theme="#style/Theme.AppCompat.Light" to <aplication> tag, for apply to all activities

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setNavigationIcon(R.drawable.back_arrow); // your drawable
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onBackPressed(); // Implemented by activity
}
});
And for API 21+ android:navigationIcon
<android.support.v7.widget.Toolbar
android:navigationIcon="#drawable/back_arrow"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"/>

I used this method from the Google Developer Documentation:
#Override
public void onCreate(Bundle savedInstanceState) {
...
getActionBar().setDisplayHomeAsUpEnabled(true);
}
If you get a null pointer exception it could depend on the theme. Try using a different theme in the manifest or use this alternatively:
#Override
public void onCreate(Bundle savedInstanceState) {
...
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
Then in the manifest, where I set the parent activity for current activity:
<activity
android:name="com.example.myapp.MyCurrentActivity"
android:label="#string/title_activity_display_message"
android:parentActivityName="com.example.myfirstapp.MainActivity" >
<!-- Parent activity meta-data to support 4.0 and lower -->
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.myapp.MyMainActivity" />
</activity>
I hope this will help you!

If you were using AppCompatActivity and have gone down the path of not using it, because you wanted to not get the automatic ActionBar that it provides, because you want to separate out the Toolbar, because of your Material Design needs and CoordinatorLayout or AppBarLayout, then, consider this:
You can still use the AppCompatActivity, you don't need to stop using it just so that you can use a <android.support.v7.widget.Toolbar> in your xml. Just turn off the action bar style as follows:
First, derive a style from one of the NoActionBar themes that you like in your styles.xml, I used Theme.AppCompat.Light.NoActionBar like so:
<style name="SuperCoolAppBarActivity" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">#color/primary</item>
<!-- colorPrimaryDark is used for the status bar -->
<item name="colorPrimaryDark">#color/primary_dark</item>
...
...
</style>
In your App's manifest, choose the child style theme you just defined, like so:
<activity
android:name=".activity.YourSuperCoolActivity"
android:label="#string/super_cool"
android:theme="#style/SuperCoolAppBarActivity">
</activity>
In your Activity Xml, if the toolbar is defined like so:
...
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
/>
...
Then, and this is the important part, you set the support Action bar to the AppCompatActivity that you're extending, so that the toolbar in your xml, becomes the action bar. I feel that this is a better way, because you can simply do the many things that ActionBar allows, like menus, automatic activity title, item selection handling, etc. without resorting to adding custom click handlers, etc.
In your Activity's onCreate override, do the following:
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_super_cool);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//Your toolbar is now an action bar and you can use it like you always do, for example:
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}

If your are using the androidx.appcompat.app.AppCompatActivity just use:
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Then just define in the Manifest.xml the parent Activity.
<activity
android:name=".MyActivity"
...>
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".ParentActivity" />
</activity>
Instead if you are using a Toolbar and you want a custom behavior just use:
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
app:navigationIcon="?attr/homeAsUpIndicator"
.../>
and in your Activity:
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//....
}
});

In Kotlin it would be
private fun setupToolbar(){
toolbar.title = getString(R.string.YOUR_TITLE)
setSupportActionBar(toolbar)
supportActionBar?.setDisplayHomeAsUpEnabled(true)
supportActionBar?.setDisplayShowHomeEnabled(true)
}
// don't forget click listener for back button
override fun onSupportNavigateUp(): Boolean {
onBackPressed()
return true
}

Simple and easy way to show back button on toolbar
Paste this code in onCreate method
if (getSupportActionBar() != null){
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
}
Paste this override method outside the onCreate method
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId()== android.R.id.home) {
finish();
}
return super.onOptionsItemSelected(item);
}

MyActivity extends AppCompatActivity {
private Toolbar toolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
...
toolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
toolbar.setNavigationOnClickListener(arrow -> onBackPressed());
}

Easily you can do it.
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
#Override
public boolean onSupportNavigateUp() {
onBackPressed();
return true;
}
Credits:
https://freakycoder.com/android-notes-24-how-to-add-back-button-at-toolbar-941e6577418e

First, you need to initialize the toolbar :
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
then call the back button from the action bar :
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
#Override
public boolean onSupportNavigateUp() {
onBackPressed();
return true;
}

In the AppCompatActivity for example you can do
public class GrandStatActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_grand_stat);
}
#Override
public void onResume() {
super.onResume();
// Display custom title
ActionBar actionBar = this.getSupportActionBar();
actionBar.setTitle(R.string.fragment_title_grandstats);
// Display the back arrow
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
}
// Back arrow click event to go to the parent Activity
#Override
public boolean onSupportNavigateUp() {
onBackPressed();
return true;
}
}

In your manifest file for the activity where you want to
add a back button, we will use the property android:parentActivityName
<activity
android:name=".WebActivity"
android:screenOrientation="portrait"
android:parentActivityName=".MainActivity"
/>
P.S. This attribute was introduced in API Level 16.

If you want to get the back arrow on a Toolbar that's not set as your SupportActionBar:
(kotlin)
val resId = getResIdFromAttribute(toolbar.context, android.R.attr.homeAsUpIndicator)
toolbarFilter.navigationIcon = ContextCompat.getDrawable(toolbar.context, resId)
toolbarFilter.setNavigationOnClickListener { fragmentManager?.popBackStack() }
to get res from attributes:
#AnyRes
fun getResIdFromAttribute(context: Context, #AttrRes attr: Int): Int {
if (attr == 0) return 0
val typedValueAttr = TypedValue()
context.theme.resolveAttribute(attr, typedValueAttr, true)
return typedValueAttr.resourceId
}

This worked perfectly
public class BackButton extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.chat_box);
Toolbar chatbox_toolbar=(Toolbar)findViewById(R.id.chat_box_toolbar);
chatbox_toolbar.setTitle("Demo Back Button");
chatbox_toolbar.setTitleTextColor(getResources().getColor(R.color.white));
setSupportActionBar(chatbox_toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
chatbox_toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//Define Back Button Function
}
});
}
}

Follow 3 steps if you want to handle your problem fastly & simply:
Add file ic_arrow.xml to Drawable folder with some codes below (add codes below into ic_arrow.xml)
<?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:width="24dp"
android:height="24dp"
android:tint="#color/black"
android:viewportWidth="24"
android:viewportHeight="24"
tools:ignore="ExtraText">
<path
android:fillColor="#android:color/white"
android:pathData="M20,11H7.83l5.59,-5.59L12,4l-8,8 8,8 1.41,-1.41L7.83,13H20v-2z" />
</vector>
Add ImageButton to Toolbar (make sure the Toolbar customized, not Titlebar or Statusbar) - You can customize the ImageButton (arrow button) position if you want
<ImageButton
android:id="#+id/arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_arrow"
android:layout_marginTop="15dp"
android:layout_marginStart="15dp"
android:background="#android:color/transparent"
tools:ignore="ContentDescription" />
Add the setArrowButton method to DetailActivity.java (or any xxxActivity.java that you need)
public class DetailActivity extends AppCompatActivity {
ImageButton arrowButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
arrowButton = findViewById(R.id.arrow);
setArrowButton(arrowButton);
}
public void setArrowButton(ImageButton arrowButton) {
arrowButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
finish(); //will close the moment activity and return to
//the last activity
}
});
}
}
Done
Preview about arrowButton

Add this to activity's xml in layout folder:
<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/prod_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>
Make toolbar clickable, add these to onCreate method:
Toolbar toolbar = (Toolbar) findViewById(R.id.prod_toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
}
});

With Kotlin it became:
Xml:
<include
android:id="#+id/tbSignToolbar "
layout="#layout/toolbar_sign_up_in"/>
In your Activity:-
setSupportActionBar(tbSignToolbar as Toolbar?)//tbSignToolbar :id of your toolbar
supportActionBar?.setDisplayHomeAsUpEnabled(true)
supportActionBar?.setDisplayShowHomeEnabled(true)

Possibly a more reliable way to get the up icon from your theme (if not using the toolbar as your action bar):
toolbar.navigationIcon = context.getDrawableFromAttribute(R.attr.homeAsUpIndicator)
In order to turn the theme attribute into a drawable I used an extension function:
fun Context.getDrawableFromAttribute(attributeId: Int): Drawable {
val typedValue = TypedValue().also { theme.resolveAttribute(attributeId, it, true) }
return resources.getDrawable(typedValue.resourceId, theme)
}

If you are using DrawerLayout with ActionBarDrawerToggle, then to show Back button instead of Menu button (and viceversa), you need to add this code in your Activity:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// ...
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, toolbar, R.string.application_name, R.string.application_name);
mDrawerLayout.addDrawerListener(mDrawerToggle);
mDrawerToggle.setHomeAsUpIndicator(R.drawable.ic_arrow_back_white_32dp);
mDrawerToggle.setToolbarNavigationClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onBackPressed(); // Or you can perform some other action here when Back button is clicked.
}
});
mDrawerToggle.syncState();
// ...
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (mDrawerToggle.onOptionsItemSelected(item))
return true;
switch (item.getItemId()) {
case android.R.id.home:
onBackPressed();
return true;
// ...
}
return super.onOptionsItemSelected(item);
}
public void showBackInToolbar(boolean isBack) {
// Remove next line if you still want to be able to swipe to show drawer menu.
mDrawerLayout.setDrawerLockMode(isBack ? DrawerLayout.LOCK_MODE_LOCKED_CLOSED : DrawerLayout.LOCK_MODE_UNLOCKED);
mDrawerToggle.setDrawerIndicatorEnabled(!isBack);
mDrawerToggle.syncState();
}
So when you need to show Back button instead of Menu button, call showBackInToolbar(true), and if you need Menu button, call showBackInToolbar(false).
You can generate back arrow (ic_arrow_back_white_32dp) over here, search arrow_back in Clipart section (use default 32dp with 8dp padding). Just select the color you want.

You can always add a Relative layout or a Linear Layout in your Toolbar and place a Image view for back icon or close icon anywhere in toolbar as you like
For example I have used Relative layout in my toolbar
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_top"
android:layout_width="match_parent"
android:layout_height="35dp"
android:minHeight="?attr/actionBarSize"
android:nextFocusDown="#id/netflixVideoGridView"
app:layout_collapseMode="pin">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Myflix"
android:textAllCaps="true"
android:textSize="19sp"
android:textColor="#color/red"
android:textStyle="bold" />
<ImageView
android:id="#+id/closeMyFlix"
android:layout_alignParentRight="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
app:srcCompat="#drawable/vector_close" />
</RelativeLayout>
</android.support.v7.widget.Toolbar>
And it looks like this:
You can add click listener on that image view from Activity or fragment like this.
closeMyFlix.setOnClickListener({
Navigator.instance.showFireTV( activity!!.supportFragmentManager)
})

If you are using JetPack Navigation.
Here is the layout for MainActivity
<androidx.constraintlayout.widget.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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolBar"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</androidx.appcompat.widget.Toolbar>
<fragment
android:id="#+id/my_nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="0dp"
app:defaultNavHost="true"
app:layout_constraintTop_toBottomOf="#id/toolBar"
app:layout_constraintBottom_toTopOf="parent"
app:navGraph="#navigation/nav_graph"/>
SetUp your toolbar in your activity like below in onCreate() of your Activity class.
val navHostFragment = supportFragmentManager
.findFragmentById(R.id.my_nav_host_fragment) as NavHostFragment? ?: return
val navController = navHostFragment.findNavController()
val toolBar = findViewById<Toolbar>(R.id.toolBar)
setSupportActionBar(toolBar) // To set toolBar as ActionBar
setupActionBarWithNavController(navController)
setupActionBarWithNavController(navController) Will create a back button on the toolBar if needed and handles the backButton functionality.
If you need to write a CustomBack functionality, create a callBack as below on your fragment onCreate() method
val callback = requireActivity().onBackPressedDispatcher.addCallback(this) {
// Handle the back button event
}
From Documentation:https://developer.android.com/guide/navigation/navigation-custom-back

maybe it will help someone,I didn't find in the answares the thing I did by the end:
with ActionBarDrawerToggle mDrawerToggle;
to show the back arrow in toolbar set:
mDrawerToggle.setDrawerIndicatorEnabled(false);
and if you want it to show the hamburger in the toolbar:
mDrawerToggle.setDrawerIndicatorEnabled(true);

How to get actionbar back button width programmatically?

I am setting toolbar to my actionbar, but I have activities when I disable home button and the title in toolbar is not centralized so I would like to get actionbar back button with programmatically to set toolbar.setContentInsetsAbsolute(0, 0);

You need to do something like this for the TextView inside the Toolbar which contains your title:
android:paddingLeft="?attr/actionBarSize"

try this
toolbar = (Toolbar) findViewById(R.id.toolbar_editprofile);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
toolbar.setNavigationIcon(getResources().getDrawable(R.drawable.back_arrow));
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
}
});

public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (getSupportActionBar() != null) {
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case android.R.id.home:
onBackPressed();
return true;
}
return super.onOptionsItemSelected(item);
}
}

You can set by setting Style, set activity theme in the manifest as no action bar and use toolbar manually in layout and set the style as you want and you can also change the size of text or you can inflate image in toolbar by using style.
<style name="Theme.MyFancyTheme" parent="android:Theme.Holo">
<item name="android:homeAsUpIndicator">#drawable/ic_toolbar_back_button</item>
</style>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:layout_gravity="top"
android:background="#android:color/transparent"
android:visibility="visible"
app:theme="#style/Theme.MyFancyTheme">

Action bar with back arrow

I am making an app and I want to put an action bar with a back arrow in a fragment.
So, I already have the fragment with the action bar but don't know how to put the back arrow on it.
Can you help me please?
Thank you,
Guilherme
This is the fragment with an action bar tag

Add following line in your fragment if you want to show the back button from the fragment :
((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
It would be better that along with doing this. You add the parent of the activity in the manifest file to make sure that parent activity is opened when back arrow is pressed.

I have some thing like this for back button in toolbar instead of action bar.
In activity_main.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:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.wolfmatrix.dummy.MainActivity">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbarId"
android:layout_width="match_parent"
android:layout_height="48dp"
android:background="#color/colorPrimary">
<TextView
android:id="#+id/toolbarTextId"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:textColor="#android:color/white"
android:textSize="14sp" />
</android.support.v7.widget.Toolbar>
<ImageButton
android:id="#+id/backButtonIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:gravity="left"
android:padding="10dp"
app:srcCompat="#drawable/ic_arrow_back_black_24dp" />
</RelativeLayout>
In styles.xml: use theme => Theme.AppCompat.Light.NoActionBar
In ic_arrow_back_black_24dp.xml, use this:
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="24dp"
android:height="24dp"
android:viewportWidth="24.0"
android:viewportHeight="24.0">
<path
android:fillColor="#ffffff"
android:pathData="M20,11H7.83l5.59,-5.59L12,4l-8,8 8,8 1.41,-1.41L7.83,13H20v-2z"/>
And now, toolbar has the back icon too.

Try below code
Implement OnBackStackChangedListener and add this code to your Fragment Activity.
#Override
public void onCreate(Bundle savedInstanceState) {
//Listen for changes in the back stack
getSupportFragmentManager().addOnBackStackChangedListener(this);
//Handle when activity is recreated like on orientation Change
shouldDisplayHomeUp();
}
#Override
public void onBackStackChanged() {
shouldDisplayHomeUp();
}
public void shouldDisplayHomeUp(){
//Enable Up button only if there are entries in the back stack
boolean canback = getSupportFragmentManager().getBackStackEntryCount()>0;
getSupportActionBar().setDisplayHomeAsUpEnabled(canback);
}
#Override
public boolean onSupportNavigateUp() {
//This method is called when the up button is pressed. Just the pop back stack.
getSupportFragmentManager().popBackStack();
return true;
}

add to your onCreate in the top
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.setDisplayHomeAsUpEnabled(true);
}
and add a function to the activity
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == android.R.id.home) {
getSupportFragmentManager().popBackStack();
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
good luck

Add below line after setcontentview()
//by doin that Back arrow will appear
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Create following overridden method after onCreate().
#Override
public boolean onSupportNavigateUp() {
finish();
return super.onSupportNavigateUp();
}

How to catch navigation icon click on toolbar from fragment?

I have a dialog fragment in which I have toolbar in layout.
I want to make back button(Navigation Icon) working in toolbar and exit the fragment when clicked. But I am unable to catch the click event on the toolbar's navigation icon in the (dialog)fragment.
Here is how I am getting toolbar :
toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);
toolbar.setNavigationIcon(R.drawable.abc_ic_ab_back_mtrl_am_alpha);
toolbar.setTitle(itemType);
((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
Here is my layout file for the dialog fragment :
<?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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/panel_cyan"
android:id="#+id/rootLayout"
>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:background="#color/color_primary"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/listViewItems"
/>
</RelativeLayout>
**Here is what is have tried so far but failed **
Options item click in id R.id.home
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id){
case android.R.id.home:
finish();
break;
}
return super.onOptionsItemSelected(item);
}
setNavigationOnClick() on the toolbar :
toolbar.setNavigationOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
Toast.makeText(getActivity(), "Back clicked!", Toast.LENGTH_SHORT).show();
}
});

add code block toolbar.setNavigationOnClickListener after setSupportActionBar(toolbar)

This works for me.
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(),"your icon was clicked",Toast.LENGTH_SHORT).show();
}
});

toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// do what ever you want here
}
return true;
}
});

Probably important as well: If you use Databinding like
MyPojoBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
binding.setPojo(myPojo)
the setSupportActionBar(toolbar) (followed by setting a click listener, title, or other toolbar attributes) must come AFTER the initialization of the binding.

Custom icon in Android toolbar

I'm trying to use define a custom icon in the support Toolbar but the only icon shown is a left arrow... I tried to set it in the layout and programmatically but the result is the same.
Here is my Activity
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.my_toolbar);
toolbar.setNavigationIcon(R.drawable.ic_launcher);
toolbar.setTitle("");
setSupportActionBar(toolbar);
}
And my toolbar layout
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/my_toolbar"
android:layout_height="wrap_content"
android:layout_width="match_parent"
app:navigationIcon="#drawable/ic_action_bar"
android:minHeight="#dimen/action_bar_size"
android:background="?attr/colorPrimary"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
/>

Just tried it myself and the issue seems to be that you have to call setNavigationIcon after setSupportActionBar(toolbar). Otherwise it'll only show the arrow as you've described.
So to fix this issue just change the code like this:
//...
Toolbar toolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(toolbar);
toolbar.setNavigationIcon(R.drawable.ic_launcher);
toolbar.setTitle("");
Note: Same goes for setting the title, contentDescription etc. I don't know if this a bug or if it is intended, but it's definitely kinda strange.

In case you want to change menu icon. (maybe somebody will need it)
In your activity
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_info, menu);
return true;
}
in your menu folder in res. (menu_info.xml)
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="#+id/menu_info_action"
android:icon="#drawable/ic_info_icon"
android:title="#string/information"
app:showAsAction="ifRoom"/>
</menu>

The current most efficient way to achieve this:
first display the left hand side icon correctly, call this function in onCreateView or onCreate:
protected void enableDisplayHomeAsHome(boolean active) {
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.setDisplayHomeAsUpEnabled(active); // switch on the left hand icon
actionBar.setHomeAsUpIndicator(R.drawable.ic_action_home); // replace with your custom icon
}
}
Now you can intercept this button press in your activity:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home: { //index returned when home button pressed
homeButtonPressed();
return true;
}
}
return super.onOptionsItemSelected(item);
}

ActionBar.setHomeAsUpIndicator(...);
This one works for me.

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

How to make the 'back-arrow' work in the toolbar? - android

in onOptionsItemSelected you need to listen for the click then do something case android.R.id.home: // do something with the click break;

Related

Back arrow in tool bar in order to go to previous activity [duplicate]

How to get actionbar back button width programmatically?

Action bar with back arrow

How to catch navigation icon click on toolbar from fragment?

Custom icon in Android toolbar

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