Develop Reference

How to add back button on action bar with more tabs

know anyone how can I add one back button on my action bar? I want to add the back button befor INFO tab. I've try some method but no one of them don't work for me. Well let's start with started.
In this image in left part it's what I need to do as actionbar and in the right part it's how looks my project right now.
I've try to put that code for add the back button but it don't works:
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setHomeButtonEnabled(true);
Here it's my Activity:
public class TrailActivity extends FragmentActivity implements ActionBar.TabListener {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
Intent intent;
Trail trail;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
intent = getIntent();
setContentView(R.layout.trail_fracment_main);
trail = intent.getParcelableExtra("trail");
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setHomeButtonEnabled(true);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
actionBar.addTab(actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(i)).setTabListener(this));
}
}
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
mViewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
#Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
if (position == 0) {
InfoFragments infoFragments = new InfoFragments();
infoFragments.setTrail(trail);
Fragment fragment = infoFragments;
return fragment;
} else if (position == 1) {
return new MapFragments();
} else {
return new WondersFragments();
}
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
return null;
}
}
Some one told me to try to implement OnBackStackChangedListener and after that he want to put in my code and that:
#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;
}
Also I've try to add and that override method, but again... nothing happen :(
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// app icon in action bar clicked; goto parent activity.
this.finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
I've try and that... but again... I've don't obtain any result :(.
So please guys, if anyone know how can I solve that problem, please show me.. I really need to do that and how much fast is possible.

How to add back button on action bar with more fragments

know anyone how can I add one back button one my action bar?Here it's my acplication and I want to add it before INFO button.
I've try to add that code for action bar but it don't works:
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setHomeButtonEnabled(true);
Here it's my activity:
public class TrailActivity extends FragmentActivity implements ActionBar.TabListener {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
Intent intent;
Trail trail;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
intent = getIntent();
setContentView(R.layout.trail_fracment_main);
trail = intent.getParcelableExtra("trail");
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setHomeButtonEnabled(true);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
actionBar.addTab(actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(i)).setTabListener(this));
}
}
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
// When the given tab is selected, tell the ViewPager to switch to the corresponding page.
mViewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
#Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
if (position == 0) {
InfoFragments infoFragments = new InfoFragments();
infoFragments.setTrail(trail);
Fragment fragment = infoFragments;
return fragment;
} else if (position == 1) {
return new MapFragments();
} else {
return new WondersFragments();
}
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
return null;
}
}
}
EDITED:
In the left part it's how should be looks my action bar with back button and in the right part it's the actually my application right now. So.. How can I make it to looks like the aplication from left part?
If anyone know please show me how I can do it.
Thx :D

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;
}
If you are looking for Back Arrow beside the ActionBar tabs.Using Sherlock you can do it.Try this
https://stackoverflow.com/a/12703960/2365507

How to swipe between Fragments with FragmentPagerAdapter

I can't figure out why swiping between my Fragments isn't working,
Here is my custom FragmentPagerAdapter:
public class TabsPagerAdapter extends FragmentPagerAdapter {
public TabsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int index) {
switch (index) {
case 0:
return new PrearrivalPlan();
case 1:
return new PrimarySurvey();
case 2:
return new Vitals();
case 3:
return new SecondarySurvey();
case 4:
return new PrepareForTravel();
}
return null;
}
#Override
public int getCount() {
// get item count - equal to number of tabs
return 5;
}
}
And here is my activity that uses it:
public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
private CustomViewPager viewPager;
private TabsPagerAdapter tabsPagerAdapter;
private ActionBar actionBar;
private String[] tabTitles = {"Pre-arrival Plan", "Primary Survey", "Vitals", "Secondary Survey", "Prepare for Travel"};
private int totalTabs = 5;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (CustomViewPager) findViewById(R.id.pager);
actionBar = getActionBar();
tabsPagerAdapter = new TabsPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(tabsPagerAdapter);
viewPager.setPagingEnabled(false);
actionBar.setHomeButtonEnabled(true);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
viewPager.setOnPageChangeListener(new CustomViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
viewPager.setOffscreenPageLimit(totalTabs);
// Remove Android icon from Action Bar
getActionBar().setIcon(new ColorDrawable(getResources().getColor(android.R.color.transparent)));
getActionBar().setDisplayShowHomeEnabled(false);
// Add tabs to Action Bar
for (String tab_name : tabTitles) {
SpannableString s = new SpannableString(tab_name);
s.setSpan(new TypefaceSpan("helveticaneuelight.ttf"), 0, s.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
actionBar.addTab(actionBar.newTab().setText(s).setTabListener(this));
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
public void updateTabTitles(int tabNumber, int checkBoxesRemaining) {
String text = tabTitles[tabNumber] + "\n (" + checkBoxesRemaining + " unchecked)";
actionBar.getTabAt(tabNumber).setText(text);
}
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
}
#Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
Intent intent = new Intent(this, MainMenu.class);
startActivity(intent);
return true;
case R.id.complete:
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
switch (which){
case DialogInterface.BUTTON_POSITIVE:
goToReport();
break;
case DialogInterface.BUTTON_NEGATIVE:
// "No" button clicked, do nothing
break;
}
}
};
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Are you sure you want to complete the checklist?").setPositiveButton("Yes", dialogClickListener).setNegativeButton("No", dialogClickListener).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void goToReport() {
Intent intent = new Intent(this, Report.class);
startActivity(intent);
}
};

could it be this viewPager.setPagingEnabled(false); method? Try taking that method out, or at least setting it to true.

FragmentPagerAdapter getItem() is returning more than it should

I have a MainActivity that controls four fragments, each of which is a tab. When my main activity starts, I have a line being printed to the log to show me what fragment is being instantiated. Here is my FragmentPagerAdapter:
public class TabsPagerAdapter extends FragmentPagerAdapter {
public TabsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int index) {
switch (index) {
case 0:
System.out.println("Returning new PrearrivalPlan()");
return new PrearrivalPlan();
case 1:
System.out.println("Returning new PrimarySurvey()");
return new PrimarySurvey();
case 2:
System.out.println("Returning new SecondarySurvey()");
return new SecondarySurvey();
case 3:
System.out.println("Returning new PrepareForTravel()");
return new PrepareForTravel();
}
return null;
}
#Override
public int getCount() {
// get item count - equal to number of tabs
return 4;
}
}
The tab bar has the following options in order:
Prearrival Plan | Primary Survey | Secondary Survey | Prepare for Travel
When my main activity starts, the following is printed to the screen:
Returning new PrearrivalPlan()
Returning new PrimarySurvey()
What it seems to be doing is loading one tab ahead of the one I have selected. Since PrearrivalPlan is the first tab, I would think it should just return a new PrearrivalPlan() except it returns both. Another example, when I click on Primary Survey tab (second tab), the following is printed to the screen:
Returning new SecondarySurvey() // <- This is the third tab!?
Because PrimarySurvey was already instantiated when the activity first started (see output above), it jumped ahead just like it did before and loaded the third tab even though I only clicked on the second.
Here is my MainActivity:
public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
private CustomViewPager viewPager;
private TabsPagerAdapter mAdapter;
private ActionBar actionBar;
private String[] tabTitles = {"Pre-arrival Plan", "Primary Survey", "Secondary Survey", "Prepare for Travel"};
#TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (CustomViewPager) findViewById(R.id.pager);
actionBar = getActionBar();
mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
viewPager.setPagingEnabled(false);
actionBar.setHomeButtonEnabled(true);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
viewPager.setOnPageChangeListener(new CustomViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
// Remove Android icon from Action Bar
getActionBar().setIcon(new ColorDrawable(getResources().getColor(android.R.color.transparent)));
getActionBar().setDisplayShowHomeEnabled(false);
// Add tabs to Action Bar
for (String tab_name : tabTitles) {
actionBar.addTab(actionBar.newTab().setText(tab_name).setTabListener(this));
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
public void updateTabTitles(int tabNumber, int checkBoxesRemaining) {
String text = tabTitles[tabNumber] + " \n (" + checkBoxesRemaining + ")";
actionBar.getTabAt(tabNumber).setText(text);
}
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
}
#Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
Intent intent = new Intent(this, MainMenu.class);
startActivity(intent);
return true;
case R.id.complete:
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
switch (which){
case DialogInterface.BUTTON_POSITIVE:
goToReport();
break;
case DialogInterface.BUTTON_NEGATIVE:
//No button clicked
break;
}
}
};
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Are you sure you want to complete the checklist?").setPositiveButton("Yes", dialogClickListener).setNegativeButton("No", dialogClickListener).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void goToReport() {
Intent intent = new Intent(this, Report.class);
startActivity(intent);
}

It is the expected behaviour of ViewPager. ViewPager always keeps one tab ahead and behind in memory in order to show slider animation. If you don't you have the next or previous tab (or fragment) in memory, trying to initiate the fragment during the slider transition will cause a performance lag or at the worse you will have the sliding fragment to be empty and get loaded later.
ViewPager also allows you to set page offset limit through setOffscreenPageLimit() which will control amount fragment to keep them in memory. By default, this is 1 which means one fragment ahead and behind will always be there in memory

listviewselection in a listfragment in a tab

I have the following problem. I have an app with a viewpager and two tabs. The two tabs are two listfragments. Now I want that if the user selects an item in the first tab, that the 5th item is selected in the second tab. (the second tab is the translation of text from the first item). My problem is that when i select an item in the first tab, and now switch to the second tab, there is nothing selected.
When I click something in the first tab I call a function in the Parent activity which calls a function in the second fragment which should select the 5th Item.
This is the code of the Fragment activity:
public class Dailyquran extends FragmentActivity implements ActionBar.TabListener {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
public ArrayList<Tweet> tweets = new ArrayList<Tweet>();
public ArrayList<Tweet> tweets2 = new ArrayList<Tweet>();
//private static ArrayList<String> roomList;
public String a;
public static int laenge_inhalt;
public static int selected;
public static String sure_media;
public static String vers_media;
String koran_filename;
//int tabwahl=0;
int playstatus=0;
MediaPlayer mp = new MediaPlayer();
MenuItem playMenu;
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.activity_dailyquran, menu);
playMenu = menu.findItem(R.id.menu_play);
return true;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTitle("Daily Quran");
setContentView(R.layout.activity_dailyquran);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the action bar.
final ActionBar actionBar = getActionBar();
// set the app icon as an action to go home
actionBar.setDisplayHomeAsUpEnabled(true);
//enable tabs in actionbar
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
// When swiping between different sections, select the corresponding tab.
// We can also use ActionBar.Tab#select() to do this if we have a reference to the
// Tab.
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
// Create a tab with text corresponding to the page title defined by the adapter.
// Also specify this Activity object, which implements the TabListener interface, as the
// listener for when this tab is selected.
actionBar.addTab(
actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
main();
}
/* WEITER UNTEN SIND DIE TABSELECTED FUNKTIONEN !!!!
//#Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
// #Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
// #Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
private FragmentTransaction mCurTransaction = null;
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public int getItemPosition(Object object) {
return POSITION_NONE; //To make notifyDataSetChanged() do something
}
#Override
public Fragment getItem(int i) {
// Fragment building_fragment = new BuildingFragment();
Fragment room_fragment = new RoomFragment();
Fragment transl_fragment = new TransliterationFragment();
// Fragment device_fragment = new DeviceFragment();
Bundle args = new Bundle();
switch(i){
case 0:
room_fragment.setArguments(args);
return room_fragment;
case 1:
return transl_fragment;
case 2:
// args.putInt(RoomFragment.ARG_SECTION_NUMBER, i);
// room_fragment.setArguments(args);
return room_fragment;
default: return null;
}
}
#Override
public int getCount() {
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0: return "a";
case 1: return "b";
case 2: return "c";
}
return null;
}
#Override
public Object instantiateItem(View container, int position) {
if (mCurTransaction == null) {
mCurTransaction = getSupportFragmentManager().beginTransaction();
}
// TODO Auto-generated method stub
Fragment fragment = getItem(position);
if (fragment!=null){
System.out.println("Fragment Found!");
mCurTransaction.attach(fragment);
}
return fragment;//super.instantiateItem(container, position);
}
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.menu_play:
play();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
MenuItem switchButton = menu.findItem(R.id.menu_play);
}
public class Tweet {
String content;
String sure;
String vers;
}
public class Tweet2 {
String content;
String sure;
String vers;
}
public void onTabReselected(Tab tab, android.app.FragmentTransaction ft) {
// TODO Auto-generated method stub
}
public void onTabSelected(Tab tab, android.app.FragmentTransaction ft) {
// TODO Auto-generated method stub
mViewPager.setCurrentItem(tab.getPosition());
}
public void onTabUnselected(Tab tab, android.app.FragmentTransaction ft) {
// TODO Auto-generated method stub
}
//HERE IS THE CODE FOR SELECTING THE SECOND ITEM
public void one_changed()
{
TransliterationFragment fragment_meaning = (TransliterationFragment) getSupportFragmentManager().findFragmentById(R.id.myfragment2);
Toast.makeText(getApplicationContext(),"Change Selection", Toast.LENGTH_SHORT).show();
fragment_meaning.change_selected(); // do what updates are required
}
AND THIS IS THE RELEVANT CODE OF THE SECOND FRAGMENT, I can see the string "Hallo" is in the console, so the function is really called, but i the Item isnt selected.
public void change_selected()
{
System.out.println("Hallo");
ListView list=getListView();
list.setSelection(4);
}

Its working now when i add this code in the function on_changed in the parent activity:
TransliterationFragment fragment_meaning = (TransliterationFragment) getSupportFragmentManager().findFragmentByTag("android:switcher:"+R.id.pager+":1");
fragment_meaning.change_selected(); // do what updates are required