Develop Reference

How to open NavigationDrawer with Fab?

I want while click on FAB button it Open Navigation Drawer.
How to do?

You can take a look at this DrawerLayout
mDrawerLayout = (DrawerLayout) getView().findViewById(R.id.drawer_layout);
FloatingActionButton myFab = (FloatingActionButton) myView.findViewById(R.id.myFAB);
myFab.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//if you need open the slide:
mDrawerLayout.openDrawer(Gravity.LEFT);
//if you need close the slide
mDrawerLayout.closeDrawer(Gravity.LEFT);
}
});

mDrawerLayout = (DrawerLayout) getView().findViewById(R.id.drawer_layout);
and add following line in Fab Onclick
mDrawerLayout.openDrawer(Gravity.LEFT);

What should I define in the setContentView in MainActivity.java file?

I want to know what should come in the bolded part below.It shows me two options:
1.toolbar(The xml I created to add the code for the google appbar)
2.activity_main
The both seems to show no errors that why I want to know which one should I add.
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.**toolbar**);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
}

hi add like this,
public class YourActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.youractivity);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
TextView mTitle = (TextView) toolbar.findViewById(R.id.toolbar_title);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayUseLogoEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayShowTitleEnabled(true);
mTitle.setText("Contact Us");
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
}
});
}
}
<include
android:id="#+id/toolbar"
layout="#layout/toolbar" />
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</RelativeLayout>
hope this will help you

As Bansal mentioned correctly, you must use activity_main in setContentView.
Your activity_main.xml will contain the toolbar. Inside the toolbar tag you must call the toolbar layout. It uses your toolbar.xml layout for your toolbar.

activity is called mutiple times when back navigation from toolbar is pressed

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("Your Interests");
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
}
});
above is my code - where i am finishing/destroying my activity on calling finish() on back button is pressed.

How to show default button back (arrow) in toolbar?

I want to set programmatically button back to my toolbar. How can I get a default drawable icon?
What I should write bar.setNavigationIcon( HERE );
If I set app:navigationIcon="?attr/homeAsUpIndicator" to my toolbar, button is shown. But how to do it in code or even maybe how to get this attr in code?
P.S:
I don't want use setSupportActionBar(..).
Tanks.

Try it:
Toolbar toolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(toolbar);
toolbar.setNavigationIcon(R.drawable.ic_launcher);
toolbar.setTitle("");
Thanks

getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);

You can use SetupToolbar:
private void SetupToolbar() {
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
}

You have to override the onCreateOptionsMenu()
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
menu.clear();
setToolbar();
}
In setToolbar() method you have to set the back icon in the tool bar
private void setToolbar() {
Toolbar ftoolbar = (Toolbar) getActivity().findViewById(R.id.toolbar);
if (ftoolbar != null) {
ftoolbar.setNavigationIcon(R.drawable.icon_back);
ftoolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Provide the Action
}
});
}
}

"Back button" using getSupportActionbar and appcompat v7 toolbar

I'm using the new toolbar from the Appcompat V7 library and I'm making an application with navigation drawer and with fragments.
In some fragments I don't want to show the hamburger icon but the arrow instead... That is fine I did this in this way:
mDrawerToggle.setDrawerIndicatorEnabled(false);
mDrawerToggle.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setHomeAsUpIndicator(R.drawable.abc_ic_ab_back_mtrl_am_alpha);
My question is that: How or where i need to set up the home button lisener or what i need to listen for the "back" button ?
I want to call the main backpressed method and to set back the navigation drawer icon with the hamburger icon..

Add this method in onCreate():
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Then override the onOptionItemSelected() as below:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
onBackPressed();
return true;
default:
return super.onOptionsItemSelected(item);
}
}

You can do it like this:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
toolbar = (Toolbar)findViewById(R.id.toolbar);
if (toolbar != null) {
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
setUpNavigationDrawer();
getFragmentManager().addOnBackStackChangedListener(backStackListener); // listen to the backstack of the fragment manager
}
Define the onBackSTackChangedListener:
private FragmentManager.OnBackStackChangedListener backStackListener = new FragmentManager.OnBackStackChangedListener() {
#Override
public void onBackStackChanged() {
setNavIcon();
};
}
Set the icon according to your fragment's backstack:
protected void setNavIcon() {
int backStackEntryCount = getFragmentManager().getBackStackEntryCount();
drawerToggle.setDrawerIndicatorEnabled(backStackEntryCount == 0);
}
Detect when the drawer icon is pressed:
public boolean onOptionsItemSelected(MenuItem item) {
if (drawerToggle.isDrawerIndicatorEnabled() && drawerToggle.onOptionsItemSelected(item)) {
return true;
}
switch (item.getItemId()) {
case x:
return true;
default:
return false;
}
}
And handle the up button:
public boolean onSupportNavigateUp() {
onBackPressed();
return true;
}
This works for me. Good luck.

Not sure if this works in OP's case, but in many cases this is probably the simplest option to implement Back button with the AppCompat Toolbar.
Skip all the setHomeButtonEnabled, setDisplayHomeAsUpEnabled and onOptionsItemSelected stuff, and related issues.
Instead, when initialising the Toolbar, simply set 1) navigation icon and 2) navigation OnClickListener for it:
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
if (enableBackNavigation) {
toolbar.setNavigationIcon(R.drawable.ic_back);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onBackPressed();
}
});
}

1- Create Toolbar layout;
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/dark_blue"
android:minHeight="?attr/actionBarSize"
local:popupTheme="#style/ThemeOverlay.AppCompat.Light"
local:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar" />
2- Include this in your layout at the place where you want the toolbar to be.
3- Paste the following code in your activity.(extends ActionBarActivity)
private Toolbar mToolbar;
//For Toolbar (Action bar) start
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
mToolbar.setNavigationIcon(R.drawable.ic_back_arrow);
mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onBackPressed();
}
});
getSupportActionBar().setTitle("Event Details");
//For Toolbar (Action bar) end
4- change the back click icon to whatever you want.

activate the back button:
getActionBar().setDisplayHomeAsUpEnabled(enable);
and listen for clicks in onBackPressed()
Obviously your activity must extend ActionBarActivity

Simply you can set Navigation icon and make sure you are setting setNavigationOnClickListener() after setting setSupportActionBar(toolbar)
toolbar.setNavigationIcon(getResources().getDrawable(R.drawable.ic_arrow_back));
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onBackPressed();
}
});

in manifest add these lines under the activity you want the back arrow working
android:parentActivityName="Your parent activity name"

Add setDisplayHomeAsUpEnabled(true)
Toolbar toolbar = findViewById(R.id.toolbar);
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.setDisplayHomeAsUpEnabled(true);
}
Handle the back button
public boolean onSupportNavigateUp() {
onBackPressed();
return true;
}