Develop Reference

How to use nav drawer in multiple activities

I want to define a single nav drawer I can use throughout my application. I followed the instructions of the chosen answer here as my first approach: Same Navigation Drawer in different Activities
I made a few modifications, namely calling onCreateDrawer from inside an overridden onCreate. I updated my subsequent activity to extend DashboardActivity ("base activity" from the example). When I launch my second activity I get a null pointer exception complaining that the nav UI doesn't exist when onCreateDrawer tries to set the toggle listened on the drawer.
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.widget.DrawerLayout.setDrawerListener(android.support.v4.widget.DrawerLayout$DrawerListener)' on a null object reference
Here are the base (dashboard) and subsequent (log workout) activity - please ask if there is other code you want to see. The code for the UI of the drawer and associated activity are what came out of the box when creating a new Nav Drawer Activity in Android Studio.
DashboardActivity.java
...
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dashboard);
onCreateDrawer();
Realm realm = Realm.getDefaultInstance();
RealmQuery<Exercise> query = realm.where(Exercise.class);
RealmResults<Exercise> result = query.findAll();
Log.d(TAG, "There are " + result.size() + " exercises ready for use.");
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent logWorkoutIntent = new Intent(getApplicationContext(), LogWorkoutActivity.class);
startActivity(logWorkoutIntent);
}
});
//TODO: Remove this sign out button
Button signOutButton = (Button) findViewById(R.id.button_sign_out);
signOutButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FirebaseAuth.getInstance().signOut();
Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
startActivity(intent);
Toast.makeText(getApplicationContext(), "Signed out", Toast.LENGTH_LONG).show();
}
});
//TODO: Remove this data tester
updateUserName();
}
//#Override
protected void onCreateDrawer() {
Log.d(TAG, "onCreateDrawer called");
//super.onCreate(savedInstanceState);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, mDrawerLayout, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
mDrawerLayout.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
...
-
LogWorkoutActivity.java
public class LogWorkoutActivity extends DashboardActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_log_workout);
setContentView(R.layout.activity_log_workout);
super.onCreateDrawer();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
//getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
}

I think you are missing a drawer with id drawer_layout in your activity_log_workout layout.
In order for this approach to work, you must have a DrawerLayout with id drawer_layout in all your activity layouts that should have the drawer.
I also noticed something peculiar with your code. In every activity that extends DashboardActivity you are first setting setContentView(R.id.activity_dashboard), then calling onCreateDrawer(), then you are changing the content view and creating the drawer again. I think this a very suboptimal approach.
I suggest you create a BaseDrawerActivity class to encapsulate the drawer creation and UI binding logic. Then you just extend it in the activities where you need a drawer. You can do it like this:
public abstract class BaseDrawerActivity extends AppCompatActivity {
// move all your drawer related fields here
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate();
setContentView(getLayoutResId());
// the same method you have right now
onCreateDrawer();
}
/*
* Extending activities use this class to supply the
* id of their layout file. This way you can set the view
* only once and there is no need to create the drawer twice.
*/
#LayoutResId
public abstract int getLayoutResId();
}

Cannot open navigationbar

I click the FloatingActionButton to open my navigation menu, But not working
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
drawer.isDrawerOpen(GravityCompat.START);
}
});
No errors in my logcat.
Any one help.

Your isDrawerOpen method checks if drawer open or not , its not doing anything only checks. You can use this in onClick method:
if(drawer.isDrawerOpen(GravityCompat.START)) {
closeNavDrawer();
}else {
drawer.openDrawer(GravityCompat.START);
}
closeNavDrawer method:
protected void closeNavDrawer() {
if (drawer != null) {
drawer.closeDrawer(GravityCompat.START);
}
}

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.

Toolbar back button is not calling onOptionsItemSelected Android

I can able to see the back button in the toolbar but when i click, nothing happens. It is not going to onOptionsItemSelected but when i remove the whole implementation of ActionBarDrawerToggle then the back button is working fine. I need to switch between both when i needed. Thank in advance.
package demo.sample.com.sample.base;
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getSimpleName();
private DrawerLayout mDrawer;
private ActionBarDrawerToggle mDrawerToggle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_digi_care);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mDrawer = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerToggle = new ActionBarDrawerToggle(
this, mDrawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
mDrawer.setDrawerListener(mDrawerToggle);
mDrawerToggle.syncState();
mDrawer.setFocusable(false);
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setItemIconTintList(null);
navigationView.setNavigationItemSelectedListener(this);
navigationView.getMenu().getItem(0).setChecked(true);
mDrawerToggle.setDrawerIndicatorEnabled(false);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
Logger.i(TAG, "onOptionsItemSelected called");
switch (item.getItemId()) {
case android.R.id.home:
Logger.i(TAG, "Back button pressed"); //Never getting called
//onBackPressed();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.map_menu, menu);
return super.onCreateOptionsMenu(menu);
}
}

If you want the onOptionsItemSelected() method to fire when the toggle Button is clicked, you need to use the four-parameter constructor for ActionBarDrawerToggle that doesn't take a Toolbar argument.
public ActionBarDrawerToggle(Activity activity,
DrawerLayout drawerLayout,
int openDrawerContentDescRes,
int closeDrawerContentDescRes)
Otherwise, the toggle will just handle the drawer opening/closing directly itself.

And i finally got a solution. instead getting toolbar home button click ononOptionsItemSelected() it can be handled through DrawerToggle.setToolbarNavigationClickListener.
mDrawerToggle.setToolbarNavigationClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// event when click home button
Log.d("cek", "home selected");
}
});
Thanks to #meow meo. Source - Cannot catch toolbar home button click event

Lock one of two fragments in DrawerLayout

I have two navigation fragments in the DrawerLayout. One navigation fragment in on the left and second is on the right.
In some cases I need to open left navigation fragment and lock it.
When I had only left navigation fragment I used drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_OPEN);
But when I have added second navigation fragment on the right, this method started to open and lock both panels.
How to open and lock only left navigation view in this case?

Change you code like this
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drawer_layout);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mLeftDrawerList = (ListView) findViewById(R.id.left_drawer);
mRightDrawerList = (ListView) findViewById(R.id.right_drawer);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,R.drawable.ic_drawer, R.string.drawer_open,R.string.drawer_close) {
public void onDrawerOpened(View view){
if(view.equals(mRightDrawerList)) {
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED, mLeftDrawerList);
} else {
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED, mRightDrawerList);
}
invalidateOptionsMenu();
}
public void onDrawerClosed(View view) {
if(view.equals(mRightDrawerList)) {
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED, mLeftDrawerList);
} else {
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED, mRightDrawerList);
}
invalidateOptionsMenu();
}
});
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
This should work.