Develop Reference

How to up navigate from fragment activity?

Hi I am having trouble while going back to parent activity from fragment activity. I want back arrow at top left corner inside the action bar.
I am able to show it in action bar activity using this code
getSupportActionBar().setDisplayShowHomeEnabled(true);
But I am not able to do it in tabbed activity's fragment.
((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayShowHomeEnabled(true);
Please Help me!!

Add this inside onCreate() of your tabbed activity,
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
And for navigating back, you need to override following method in your tabbed activity.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
onBackPressed();
}
return super.onOptionsItemSelected(item);
}
Happy coding.

Add this method to your activity to navigate back.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
onBackPressed();// or the action you want to do eg. Removing fragment
break;
}
return super.onOptionsItemSelected(item);
}

Dynamic parent activity for Android up \ back navigation in Preferences menu

I've a Preference activity for a options menu in my Android app.
I've enabled the Up \ Back navigation on the ActionBar and I need to come back to the previous activity that called the Options menu.
For the Preference activity, I could use in the manifest:
android:parentActivityName="mypackage.com.MainActivity"
but how come back to other activies ? The Options menu is called from 4 different activities.
public class Prefs extends PreferenceActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
ActionBar actionBar = getActionBar();
// Enabling Up / Back navigation
actionBar.setDisplayHomeAsUpEnabled(true);
}
}

Make sure that you have declared the parent activity in the manifest like this...
<activity
android:name="com.myapp.SetPreferenceActivity"
android:parentActivityName="com.myapp.MainActivity"
>
and then make sure to add the case into your onOptionsItemSelected method...
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
//Take me back to the main activity
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
if you prefer to have the up button point to a custom activity, you can just use an intent.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
Intent changeActivity = new Intent(this,OtherActivity.class);
startActivity(changeActivity);
return true;
}
return super.onOptionsItemSelected(item);
}

The default behaviour of the Back button is that it will get you back to the calling activity. The system maintains a back stack of activities while the user navigates the application. Do you need to override this functionality? Please be more specific.

Solved in this way:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
}
return true;
}

ActionBar Up button: go to previous Activity with prev fragment

I need your help regarding my application flow.
MainActivity (with Navigation Drawer)
-- Fragment A
-- Fragment B
-- Fragment C (articles list view)
ArticleActivity
-- Fragment D (article detail view)
Fragment C (MainActivity) displays a list of items (ListView). Selecting an item leads to fragment D (handle by ArticleActivity) which presents that item in more detail.
Fragment D displays a "Up" button that should allow the user to returns to previous screen (the detail view). The problem is that when the "Up" button is pressed the previous activity is displayed but not the previous activated fragment (the defaut fragment (A) is instead displayed).
My current code:
public class FragmentC extends Fragment {
public static FragmentC newInstance() {
FragmentC fragment = new FragmentC();
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_courses, container, false);
...
// Somewhere in my code I have a onClickListener to launch the detail view activity
setOnClickListener(new OnCardClickListener() {
#Override
public void onClick(Card card, View view) {
Intent i = new Intent(getActivity(), ArticleActivity.class);
i.putExtra("articleIndex", mArticle.getId());
startActivity(i);
}
});
...
return view;
}
}
public class ArticleActivity extends Activity {
private long mArticleIndex;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_course);
mArticleIndex = getIntent().getExtras().getLong("articleIndex", 0);
// Set up action bar:
// Specify that the Home button should show an "Up" caret, indicating that touching the
// button will take the user one step up in the application's hierarchy.
final ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
// Place an ArticleFragment as our content pane
ArticleFragment fragment = ArticleFragment.newInstance(mArticleIndex);
getFragmentManager().beginTransaction().replace(R.id.container, fragment).commit();
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// This is called when the Home (Up) button is pressed in the action bar.
Intent upIntent = new Intent(this, MainActivity.class);
upIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(upIntent);
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
}
I think that I can resolve this issue by passing parameters to my Intent. For example i.putExtra("displayFragment", FragmentD) and then on the MainActivity retrieve it and tell to the FragmentManager to display the wanted fragment. I do not know if it's can work.
But it's maybe not the right way to achieve that?
Do you have any better workaround?

Android - Calling Activity into Fragments - Navigation Drawer

I've downloaded the sample project from the Android official site http://developer.android.com/training/implementing-navigation/nav-drawer.html. I am trying to understand how the Navigation Drawer works. So, I have one doubt, they call a Fragment for each item from the left menu. In my project, I have a big activity which I am trying to call by this Fragment:
public class HomeFragment extends Fragment {
public HomeFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Intent intent = new Intent();
intent.setClass(getActivity(), ListMatch.class);
startActivity(intent);
View rootView = inflater.inflate(R.layout.list_match, container, false);
return rootView;
}
}
But, if I do that, it calls perfectly my Activity, but the menu disappear. How can I call this activity and keep my menu? Thanks a lot.

Like Raghunandan said, the drawer applies wihin a single activity. It's common to launch a new activity from the "main" drawer, but usually that kind of activity would have the up action set in the action bar to go back to the main activity.

Same Title Bar but different View below it in Android?

In one of my Android Application I need to keep the title bar same but the view that is shown in the rest of the screen changes. So, I have taken different Activity for all the views that I need to show and set the title bar in every Activities onCreate method.
Now, the problem is that I have a button in the title bar and need to perform certain action on its click event. Writing the same event handling code in every Activity class is very cumbersome. Is there any other way out that whenever there is a click event on that button of the title bar then we can have the same functionality without writing the same code in all the Activity classes.
Can we use ViewGroup for that? I don't have much idea about ViewGroup. Is that possible with ViewGroup?
If anyone knows the solution then please let me know.
Thanks & Regards
Sunil

If you are sharing view elements and functionality amongst several classes extending Activity, you might want to consider making a common superclass to handle this overlap.

The best solution is to keep a base activity like this.
public class HeaderBaseActivity extends AppCompatActivity{
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
mAppPreferences = AppUtil.getAppPreferences(this);
item_patients = menu.findItem(R.id.item_patients);
setBatchCountOnMenu(0);
RealmConfiguration realmConfig = new RealmConfiguration.Builder(this).build();
mRealm = Realm.getInstance(realmConfig);
mDotor = new Gson().fromJson(mAppPreferences.getString(Constants.SETTINGS_OBJ_DOCTOR, ""), Doctor.class);
mAppPreferences = AppUtil.getAppPreferences(this);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_logout:
/* DialogUtility.showShortToast(this, " Main manu Action Logout");*/
SharedPreferences.Editor Editor = mAppPreferences.edit();
Editor.putBoolean(Constants.SETTINGS_IS_LOGGED_IN, false);
Editor.apply();
clearRealmDB();
Intent loginIntent = new Intent(HeaderBaseActivity.this, LoginActivity.class);
loginIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
startActivity(loginIntent);
finish();
break;
case R.id.item_patients:
System.out.println("current activity "+getApplicationContext());
Intent mPatientListIntent = new Intent(HeaderBaseActivity.this, PatientSummaryInfoActivity.class);
mPatientListIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(mPatientListIntent);
break;
case R.id.action_doctor_profile:
openDialogOfDoctorProfile();
break;
}
return super.onOptionsItemSelected(item);
}
}
Your other activities can extend the above activity like this:
public class MainActivity extends HeaderBaseActivity{
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
setSupportActionBar(toolbar);
}
}