Develop Reference

Getting blank page on displaying fragment inside a fragment?

This is my fragment which is in navigation menu.
class MirandaFragment extends Fragment {
protected View view;
FragmentPagerAdapter adapterViewPager;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
view = inflater.inflate(R.layout.miranda, container, false);
ViewPager vpPager = (ViewPager) view.findViewById(R.id.vpPager);
adapterViewPager = new MyPageAdapter(getFragmentManager());
vpPager.setAdapter(adapterViewPager);
return view;
}
}
This is the adapter where I has set two fragments EngMiranda and SpaMiranda.
class MyPageAdapter extends FragmentPagerAdapter {
private static int NUM_ITEMS = 2;
public MyPageAdapter(FragmentManager fragmentManager) {
super(fragmentManager);
}
// Returns total number of pages.
#Override
public int getCount() {
return NUM_ITEMS;
}
// Returns the fragment to display for a particular page.
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return EngMiranda.newInstance("Fragment 1", getCount());
case 1:
return SpaMiranda.newInstance("Fragment 2", getCount());
default:
return null;
}
}
// Returns the page title for the top indicator
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "English";
case 1:
return "Spanish";
default:
return null;
}
}
}
After app gets open for first time then I am able to open the fragment and view the tab fragments in it but when we open that fragment for second time then adapter is not displaying.

6 Fragments hided/shown by ViewPager without being dismissed

I have 6 Fragments within an activity that I created as
I want to swipe from one to the other and need them to not being dismissed but onyl hide/show y the viewpager.
Is there a way to derive a viewpager class or a SectionsPagerAdapter to do that.
I already add
mViewPager.setOffscreenPageLimit(6);
but it didn't work. When swiping from the 4th fragment to 3rd or to 5th, the app crashes.
Relevant parts of my code simpified and renamed Fragment classes to get the code readable:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// create the fragment once for all !
if (savedInstanceState == null) {
fragment1 = Fragment1.newInstance(1);
fragment2 = Fragment2.newInstance(2);
fragment3 = Fragment3.newInstance(3);
fragment4 = Fragment4.newInstance(4);
fragment5 = Fragment5.newInstance(5);
fragment6 = Fragment6.newInstance(6);
}
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setOffscreenPageLimit(6);
});
public static class Fragment1 extends Fragment {
private static final String ARG_SECTION_NUMBER = "section_number";
public Fragment1() {
}
public static Fragment1 newInstance(int sectionNumber) {
Fragment1fragment = new Fragment1();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
fragment.setRetainInstance( true);
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_1, container, false);
TextView textView = (TextView) rootView.findViewById(R.id.section_label);
// "Main Frag"
textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
return rootView;
}
#Override
public void onResume() {
super.onResume();
// The activity is about to become visible again, recalcule
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
//return PlaceholderFragment.newInstance(position + 1);
switch (position)
{
case 0 : return fragment1; //instead of Fragment1.newInstance(1);
case 1 : return fragment2;
case 2 : return fragment3;
case 3 : return fragment4;
case 4 : return fragment5;
case 5 : return fragment6;
default: return null;
}
}
#Override
public int getCount() {
// Show 6 total pages.
return 6;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "SECTION 1";
case 1:
return "SECTION 2";
case 2:
return "SECTION 3";
case 3:
return "SECTION 4";
case 4:
return "SECTION 5";
case 5:
return "SECTION 6";
}
return null;
}
}

Extend your section pager adapter by FragmentSatePagerAdaper
And set
mViewPager.setOffscreenPageLimit(6);

How to use tabbed activity in android studio 1.5.x?

I have two fragments and want to show them as tab view.But Don"t know where to add those in the below code. These are the code when you select "tabbed activity" in android studio project.
public class MainActivity extends AppCompatActivity {
/**
* The {#link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {#link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {#link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {#link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
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();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
public PlaceholderFragment() {
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
TextView textView = (TextView) rootView.findViewById(R.id.section_label);
textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
return rootView;
}
}
/**
* A {#link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.newInstance(position + 1);
}
#Override
public int getCount() {
// Show 3 total pages.
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Demo";
case 1:
return "SECTION 2";
}
return null;
}
}
}
Fragment class
public class Fragment1 extends Fragment {
public static Fragment1 newInstance() {
Fragment1 fragment = (Fragment1) new Fragment();
return fragment;
}
public Fragment1() {
}
Button ClickMe;
TextView tv;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment1, container, false);
ClickMe = (Button) rootView.findViewById(R.id.button);
tv = (TextView) rootView.findViewById(R.id.textView2);
ClickMe.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(tv.getText().toString().contains("Hello")){
tv.setText("Hi");
}else tv.setText("Hello");
}
});
return rootView;
}
} // This is the end of our Fragment1 Class

This is the place where you need to get your fragment to the specific tab respectively.
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.newInstance(position + 1);
}
Use a switch case statement for the choosen position and get the fragment in tab.
switch (position) {
case 0:
// first fragment activity
return new firstfragment();
case 1:
// second fragment activity
return new secondFragment();
case 2:
// third fragment activity
return new thirdFragment();
}
return null;
}

public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
switch (position) {
case 0:
Fragment1 tab1 = new Fragment1();
return tab1;
case 1:
Fragment2 tab2 = new Fragment2();
return tab2;
// return PlaceholderFragment.newInstance(position + 1);
}
return null;
}
Just changed the above code like this and in Fragment1 extends public class
Fragment1 extends android.support.v4.app.Fragment

First you have to specify how many tabs you are going to use with getCount() method:
#Override
public int getCount() {
int numberOfTabs = 3;
return numberOfTabs;
}
Then, you have to create your fragments your own and add them in getItem(int position) method like this:
#Override
public Fragment getItem(int position)
switch(position){
case 0:
return new YourFirstFragment();
case 1:
return new YourSecondFragment();
case 2:
return new YourThirdFragment();
default:
return new SomeFragment();
}
}
Then you will change the tab names using getPageTitle(int position) method like this:
#Override
public CharSequence getPageTitle(int position)
switch(position){
case 0:
return "First";
case 1:
return "Second";
case 2:
return "Third";
default:
return "Some";
}
}

Android Slide Fragment don't load all

I am working on Fragments to do a simple 3 pages application, with slide between page.
But For now, I Have 3 Fragments, but the application slide only with de 2 and 3.
It must do 1 -> 2 -> 3, but It do 3 -> 2 -> 3. If you know what I try to say.
This is my code
public class main extends Activity {
public static SectionsPagerAdapter mSectionsPagerAdapter;
public static Boolean init = true;
static ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
[...]
}
public static class PlaceholderFragment extends Fragment {
private static final String ARG_SECTION_NUMBER = "section_number";
private static int ARG_NUMBER = 0;
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
ARG_NUMBER = sectionNumber;
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = new View(this.getActivity());
// THE PROBLEM SHOULD COME FROM HERE
switch (ARG_NUMBER) {
case 1:
rootView = inflater.inflate(R.layout.fragment_main, container, false);
break;
case 2:
rootView = inflater.inflate(R.layout.fragment_map, container, false);
break;
case 3:
rootView = inflater.inflate(R.layout.profile, container, false);
break;
}
return rootView;
}
}
}
So, if anyone has an idea ... Thanks !
EDIT :
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.newInstance(position + 1);
}
#Override
public int getCount() {
// Show 3 total pages.
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;
}
}

you should use arguments of fragment instead of setting ARG_NUMBER = sectionNumber
your code should look something like this:
public static class PlaceholderFragment extends Fragment {
private static final String ARG_SECTION_NUMBER = "section_number";
private int ARG_NUMBER = 0;
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = new View(this.getActivity());
ARG_NUMBER = getArguments().getInt(ARG_SECTION_NUMBER, 0);
switch (ARG_NUMBER) {
case 1:
rootView = inflater.inflate(R.layout.fragment_main, container, false);
break;
case 2:
rootView = inflater.inflate(R.layout.fragment_map, container, false);
break;
case 3:
rootView = inflater.inflate(R.layout.profile, container, false);
break;
}
return rootView;
}
}
Note: Use if-else ladder if Switch case does not allow for non-constant value.

FragmentPagerAdapter class is triggered only when the tab is clicked for the first time

I'm trying to develop a tab based application. Each tab has its fragment. One of them has ViewPager, and ViewPager has its own pages. I move from to another by scrolling in this viewpager.
When I open the application for the first time, there is no problem. However, when I move from this tab, and come to it again, it does not show viewpager content, it does not fire FragmentPagerAdapter class.
Tab A - Tab B - Tab C
Tab C Fragment has ViewPage.
ViewPage has its own pages.
public class FragmentC extends Fragment {
public static final String ARG_SECTION_NUMBER = "section_number";
static ViewPager C_mViewPager;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
C_mViewPager = (ViewPager)inflater.inflate(R.layout.fragmentC, container,false);
C_SectionsPagerAdapter mC_PagerAdapter=new C_SectionsPagerAdapter(MainActivity.fragmentManagerv4);
C_mViewPager.setAdapter(mC_PagerAdapter);
return C_mViewPager;
}
public class C_SectionsPagerAdapter extends FragmentPagerAdapter {
public C_SectionsPagerAdapter (FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int i) {
Fragment fragment = null ;
Bundle args;
switch (i) {
case 0:
fragment=new A_SubFragment();
break;
case 1:
fragment = new B_SubFragment();
break;
case 2:
fragment = new C_SubFragment();
break;
case 3:
fragment = new D_SubFragment();
break;
}
return fragment;
}
#Override
public int getCount() {
return 4;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0: return getString(R.string.title_section1).toUpperCase();
case 1: return getString(R.string.title_section2).toUpperCase();
case 2: return getString(R.string.title_section3).toUpperCase();
case 3: return getString(R.string.title_section4).toUpperCase();
}
return null;
}
}
public static class A_SubFragment extends Fragment {
public A_SubFragment() {
}
public static final String ARG_SECTION_NUMBER = "section_number";
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
RelativeLayout theLayout=(RelativeLayout)inflater.inflate(R.layout.a_sub_fragment, container,false);
//...
return theLayout;}}
}
Fragment C;
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" />

I got the answer, I used FragmentStatePagerAdapter Instead of FragmentPagerAdapter