I want to know what went wrong in this which object is showing as null pointer here. Please do clarify me.
Here is my code:
public class HomeFragment extends Fragment {
int mFlipping = 0 ; // Initially flipping is off
Button mButton ;
public HomeFragment(){}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
ViewFlipper flipper = (ViewFlipper) getActivity().findViewById(R.id.flipper1);
if (mFlipping == 0) {
/** Start Flipping */
flipper.startFlipping();
mFlipping = 1;
mButton.setText(R.string.str_btn_stop);
} else {
/** Stop Flipping */
flipper.stopFlipping();
mFlipping = 0;
mButton.setText(R.string.str_btn_start);
}
}
};
/** Getting a reference to the button available in the resource */
mButton = (Button) getActivity().findViewById(R.id.btn);
/** Setting click event listner for the button */
mButton.setOnClickListener(listener);
return rootView;
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.main, menu);
super.onCreateOptionsMenu(menu, inflater);
}
}
Related
I have a ViewPager set up with my app and am trying to also set two floating action buttons, a left one and a right one, to do the same thing as the ViewPager, so that the user has a choice in terms of navigation. I'm trying to have it set so that the left button is invisible on the first page, and the right button is invisible on the last page, but the appearances of the buttons seem to be sporadic. I've tried debugging the app, and upon testing each situation, the appropriate code is executed, so I can't understand why this behavior is happening. Any help would be appreciated.
TestFragment:
public class TestFragment extends Fragment {
public static final String ARG_ID = "Id";
private int Id;
private String title;
private TextView titleTV;
private String description;
private TextView descriptionTV;
private int number;
private TextView numberTV;
private FloatingActionButton leftBtn;
private FloatingActionButton rightBtn;
public static TestFragment newInstance(int Id) {
Bundle args = new Bundle();
args.putSerializable(ARG_ID, Id);
TestFragment fragment = new TestFragment();
fragment.setArguments(args);
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_test, container, false);
Id = getArguments().getInt(ARG_ID);
title = Test.testData[Id].getTitle();
description = Test.testData[Id].getDescription();
number = Test.testData[Id].getNumber();
titleTV = view.findViewById(R.id.title);
titleTV.setText(title);
descriptionTV = view.findViewById(R.id.description);
descriptionTV.setText(description);
numberTV = view.findViewById(R.id.number);
numberTV.setText(String.valueOf(number));
leftBtn = view.findViewById(R.id.left_btn);
rightBtn = view.findViewById(R.id.right_btn);
toggleButtons();
leftBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
testViewPager.setCurrentItem(--index);
toggleButtons();
}
});
rightBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
testViewPager.setCurrentItem(++index);
toggleButtons();
}
});
return view;
}
public void toggleButtons() {
if(index == 0) {
leftBtn.setVisibility(View.INVISIBLE);
}
else if(index == Test.testData.length - 1) {
rightBtn.setVisibility(View.INVISIBLE);
}
else {
leftBtn.setVisibility(View.VISIBLE);
rightBtn.setVisibility(View.VISIBLE);
}
}
}
TestPagerActivity:
public class TestPagerActivity extends AppCompatActivity {
public static int index;
public static ViewPager testViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_pager);
index = (int) getIntent().getSerializableExtra(EXTRA_ID);
testViewPager = findViewById(R.id.test_view_pager);
FragmentManager fragmentManager = getSupportFragmentManager();
testViewPager.setAdapter(new FragmentStatePagerAdapter(fragmentManager) {
#Override
public Fragment getItem(int position) {
return TestFragment.newInstance(position);
}
#Override
public int getCount() {
return Test.testData.length;
}
});
for(int i = 0; i < Test.testData.length; i++) {
if(i == index) {
testViewPager.setCurrentItem(i);
break;
}
}
}
}
I am trying to implement viewpager with Tablayout. In this everything is fine working properly, but the one problem is when i come back from another screen view pager lost their position with Tablayout and when i scroll its crash the app.I find many solutions but all of these cannot work for this. Here is my code Adapter Class:-
public class Portfolio_Adapter extends FragmentStatePagerAdapter {
int tabCount;
public Portfolio_Adapter(FragmentManager fm,int tabCount) {
super(fm);
this.tabCount=tabCount;
}
#Override
public Fragment getItem(int position) {
switch (position){
case 0:
Websites_Fragment websites_fragment=new Websites_Fragment();
return websites_fragment;
case 1:
Mobileapplication_fragment mobileapplication_fragment=new Mobileapplication_fragment();
return mobileapplication_fragment;
case 2:
Graphics_Fragment graphics_fragment=new Graphics_Fragment();
return graphics_fragment;
default:
return null;
}
}
#Override
public int getCount() {
return tabCount;
}
}
Fragment class:-
public class Portfolio_fragment extends Fragment {
TabLayout tabLayout;
ViewPager viewPager;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.portfolio_fragment, container, false);
((AppCompatActivity) getActivity()).getSupportActionBar().setTitle("Portfolio");
tabLayout = (TabLayout) view.findViewById(R.id.portfolio_tabLayout);
tabLayout.setupWithViewPager(viewPager);
tabLayout.addTab(tabLayout.newTab().setText("Websites"));
tabLayout.addTab(tabLayout.newTab().setText("Mobile Application"));
tabLayout.addTab(tabLayout.newTab().setText("Graphics"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
viewPager = (ViewPager) view.findViewById(R.id.portfolio_pager);
Portfolio_Adapter adapter = new Portfolio_Adapter(getChildFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(3);
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
ViewGroup slidingTabStrip = (ViewGroup) tabLayout.getChildAt(0);
for (int i = 0; i < tabLayout.getTabCount(); i++) {
View tab = slidingTabStrip.getChildAt(i);
LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) tab.getLayoutParams();
layoutParams.weight = 1;
tab.setLayoutParams(layoutParams);
}
return view;
}
}
Your code is right you only have to change the placement of code put your
tabLayout.setupWithViewPager(viewPager);
,
tabLayout.addTab(tabLayout.newTab().setText("Websites"));
tabLayout.addTab(tabLayout.newTab().setText("Mobile Application"));
tabLayout.addTab(tabLayout.newTab().setText("Graphics"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
after setadapter in viewPager
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(3);
Hey guys I have a recyclerview adapter that populates list of some data on a cardview. I created a three dot menu towards the lower right bottom of the card layout which would actually delete the card row from the recyclerview and also make delete of the item from the sqlite database that stores rows data. The issue is I couldn't figure out how to integrate the method that would implement the delete into the recyclerview ViewHolder. Here is the source code
public class BeneficiaryRecyclerAdapter extends RecyclerView.Adapter<BeneficiaryRecyclerAdapter.BeneficiaryViewHolder> {
private List<Beneficiary> listBeneficiary;
public ImageView overflow;
private Context mContext;
public BeneficiaryRecyclerAdapter(){
}
public BeneficiaryRecyclerAdapter(List<Beneficiary> listBeneficiary, Context mContext) {
this.listBeneficiary = listBeneficiary;
this.mContext = mContext;
}
#Override
public BeneficiaryViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
// inflating recycler item view
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_beneficiary_recycler, parent, false);
return new BeneficiaryViewHolder(itemView);
}
#Override
public void onBindViewHolder(final BeneficiaryViewHolder holder, int position) {
holder.textViewName.setText(listBeneficiary.get(position).getName());
holder.textViewEmail.setText(listBeneficiary.get(position).getEmail());
holder.textViewAddress.setText(listBeneficiary.get(position).getAddress());
holder.textViewCountry.setText(listBeneficiary.get(position).getAddress());
holder.overflow.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
showPopupMenu(holder.overflow);
}
});
}
/**
* Showing popup menu when tapping on 3 dots
*/
private void showPopupMenu(View view) {
// inflate menu
PopupMenu popup = new PopupMenu(this.mContext, view);
MenuInflater inflater = popup.getMenuInflater();
inflater.inflate(R.menu.beneficiary_m, popup.getMenu());
popup.setOnMenuItemClickListener(new MyMenuItemClickListener());
popup.show();
}
//NOTE: The method that would delete the item from the database and recyclerview but i need this method to be called from the onMenuItemClick of the case with id of case R.id.action_delete_beneficiary
public void deleteItem(final BeneficiaryViewHolder holder, int position) {
final DatabaseHelper2 db = new DatabaseHelper2(mContext);
db.open();
db.deleteContact(position);
db.close();
listBeneficiary.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, listBeneficiary.size());
holder.itemView.setVisibility(View.GONE);
}
/**
* Click listener for popup menu items
*/
class MyMenuItemClickListener implements PopupMenu.OnMenuItemClickListener {
public MyMenuItemClickListener() {
}
#Override
public boolean onMenuItemClick(MenuItem menuItem) {
switch (menuItem.getItemId()) {
case R.id.action_delete_beneficiary:
Toast.makeText(mContext, "deleting beneficiary", Toast.LENGTH_SHORT).show();
return true;
case R.id.action_edit_beneficiary:
Toast.makeText(mContext, "editing beneficiary", Toast.LENGTH_SHORT).show();
return true;
default:
}
return false;
}
}
#Override
public int getItemCount() {
Log.v(BeneficiaryRecyclerAdapter.class.getSimpleName(),""+listBeneficiary.size());
return listBeneficiary.size();
}
/**
* ViewHolder class
*/
public class BeneficiaryViewHolder extends RecyclerView.ViewHolder {
public AppCompatTextView textViewName;
public AppCompatTextView textViewEmail;
public AppCompatTextView textViewAddress;
public AppCompatTextView textViewCountry;
public ImageView overflow;
public BeneficiaryViewHolder(View view) {
super(view);
textViewName = (AppCompatTextView) view.findViewById(R.id.textViewName);
textViewEmail = (AppCompatTextView) view.findViewById(R.id.textViewEmail);
textViewAddress = (AppCompatTextView) view.findViewById(R.id.textViewAddress);
textViewCountry = (AppCompatTextView) view.findViewById(R.id.textViewCountry);
overflow = (ImageView) view.findViewById(R.id.overflow);
}
}
}
I would be glad if anybody can help me with this.
Use this code to delete recyclerview items on same row click button.
holder.deleteImg.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(list.size()!=0){
list.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position,list.size());
}
}
});
viewPager4 Fragment Activities
If I click on the Texts that play short sounds, one after another then after sometimes the mediaplayer hangs and doesn't play any sound. But if I'm able to destroy activity and recreate the same activity with refresh button in Action Bar, I'd be able to click sounds again.
So what to write in the code for R.id.item2?
Or there is any other way that continuous clicking on short sounds by these texts is possible without any hang kind of problem?
Following is the reference code:
public class module1 extends FragmentActivity {
static Context con;
static int length = 0;
ViewPager mViewPager;
SectionsPagerAdapter mSectionsPagerAdapter;
static MediaPlayer mediaplayer, mediaplayert, m;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
con = this;
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.mains, menu);
// Just .main into .mains [created new for different behavior of Action Bar]
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == R.id.item1) {
Intent in = new Intent(Intent.ACTION_VIEW,
Uri.parse("http://www.google.com"));
startActivity(in);
}
if (item.getItemId() == R.id.item2) {
//what should i write here? to destroy and recreate the same fragment activity again.
//Problem: After clicking fast on one after another text links, mediaplayert hangs and doesnt play
//Solution: exit app destroy and reopen, then mediaplayer works fine...
//SO, what to write here? kindly help!
}
return super.onOptionsItemSelected(item);
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int arg0) {
Fragment ff = new DummySectionFragment1();
switch (arg0) {
case 0:
ff = new DummySectionFragment1();
break;
}
Bundle args = new Bundle();
args.putInt(DummySectionFragment1.ARG_SECTION_NUMBER, arg0 + 1);
ff.setArguments(args);
return ff;
}
#Override
public int getCount() {
return 1;
}
#Override
public CharSequence getPageTitle(int arg0) {
Locale l = Locale.getDefault();
switch (arg0) {
case 0:
return getString(R.string.title_section27).toUpperCase(l);
}
return null;
}
}
public static class DummySectionFragment1 extends Fragment {
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment1() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.m01set01, container, false);
// Genius Shot by Stupid vIC//
TextView Text = (TextView) rootView.findViewById(R.id.textView2);
Text.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
mediaplayert = MediaPlayer.create(MainActivity.con,
R.raw.sound1);
mediaplayert.start();
}
});
TextView Text1 = (TextView) rootView.findViewById(R.id.textView4);
Text1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
mediaplayert = MediaPlayer.create(MainActivity.con,
R.raw.sound2);
mediaplayert.start();
}
});
TextView Text2 = (TextView) rootView.findViewById(R.id.textView6);
Text2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
mediaplayert = MediaPlayer.create(MainActivity.con,
R.raw.sound3);
mediaplayert.start();
}
});
return rootView;
}
}
#Override
protected void onDestroy() {
if (mediaplayert != null) {
mediaplayert.stop();
mediaplayert= null;
}
super.onDestroy();
}
}
In my android application, I am switching between the two set of images-(Set1, Set2) displayed in a GridView-A inside a Fragment-A.I am doing this on a button press using a boolean variable. Clicking on any GridView icon leads to another Fragment-B. The problem is when I press back button on Fragment-B , the Fragment-A is always loaded with the images of Set1 by default. I want the same set of images (Set1 or Set2 ) to be loaded on FramentA that were displayed before going to FragmentB.
EDITED:
Fragment Code
public class GridViewFragment extends Fragment {
Context context;
GridView GridMenu;
GridViewAdapter ga;
Button Btn_Settings;
Button Btn_lang_Ch;
Button favoriteDuas;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//fragment = new GridViewFragment();
if (view == null) {
context = inflater.getContext();
view = inflater.inflate(R.layout.fragment_gridview, container, false);
ga = new GridViewAdapter(context);
Btn_lang_Ch = (Button) view.findViewById(R.id.lng_ch);
Btn_Settings = (Button) view.findViewById(R.id.button_settings);
favoriteDuas = (Button) view.findViewById(R.id.btn_favorite_duas);
GridMenu = (GridView) view.findViewById(R.id.gridView1);
GridMenu.setAdapter(ga);
} else {
// remove view from previously attached ViewGroup
ViewGroup parent = (ViewGroup) view.getParent();
parent.removeView(view);
}
return view;
}
#Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
Btn_lang_Ch.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
ga.changeImages(!ga.imageSetChange);
ga.Lang_Status();
}
});
GridMenu.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View view, int position, long id) {
((MainActivity) context).loadSingleDuaFragment();
}
});
super.onActivityCreated(savedInstanceState);
}
}
GridView Adapter
public class GridViewAdapter extends BaseAdapter {
public boolean imageSetChange = false;
public static boolean curr_lang = false;//english
public Integer[] mThumbIds = {
R.drawable.eng_pic1, R.drawable.eng_pic2,
R.drawable.eng_pic3, R.drawable.eng_pic4,
R.drawable.eng_pic5, R.drawable.eng_pic6,
R.drawable.eng_pic7, R.drawable.eng_pic8,
R.drawable.eng_pic9, R.drawable.eng_pic10,
R.drawable.eng_pic11, R.drawable.eng_pic12,
R.drawable.eng_pic13, R.drawable.eng_pic14,
R.drawable.eng_pic15, R.drawable.eng_pic16,
R.drawable.eng_pic17, R.drawable.eng_pic18,
R.drawable.eng_pic19, R.drawable.eng_pic20,
R.drawable.eng_pic21
};
public Integer[] mThumbIds1 = {
R.drawable.urdu_dua1, R.drawable.urdu_dua2,
R.drawable.urdu_dua3, R.drawable.urdu_dua4,
R.drawable.urdu_dua5, R.drawable.urdu_dua6,
R.drawable.urdu_dua7, R.drawable.urdu_dua8,
R.drawable.urdu_dua9, R.drawable.urdu_dua10,
R.drawable.urdu_dua11, R.drawable.urdu_dua12,
R.drawable.urdu_dua13, R.drawable.urdu_dua14,
R.drawable.urdu_dua15, R.drawable.urdu_dua16,
R.drawable.urdu_dua17, R.drawable.urdu_dua18,
R.drawable.urdu_dua19, R.drawable.urdu_dua20,
R.drawable.urdu_dua21
};
private Context mContext;
public GridViewAdapter(Context c) {
mContext = c;
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return mThumbIds.length;
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return mThumbIds[position];
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View MyView;
if (convertView == null) {
LayoutInflater li = ((Activity) mContext).getLayoutInflater();
MyView = li.inflate(R.layout.menuitem, parent, false);
} else {
MyView = (View) convertView;
}
ImageView iv = (ImageView) MyView.findViewById(R.id.image);
if (imageSetChange) {
iv.setImageResource(mThumbIds1[position]);
} else {
iv.setImageResource(mThumbIds[position]);
}
return MyView;
}
public void changeImages(boolean change) {
this.imageSetChange = change;
notifyDataSetChanged();
// gf.Lang_Status();
}
public void Lang_Status() {
// if curr_eng
if (!curr_lang)
this.curr_lang = true; // change to urdu
// if curr_urdu
else
this.curr_lang = false; // change to english
}
}
EDIT:
MainActivity
public void loadGridViewFragment() {
if (activityActive) {
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
if(getSupportFragmentManager().findFragmentByTag(GridViewFragment.TAG)!=null){
ft.replace(R.id.fl_view, frag,GridViewFragment.TAG);
}
else
{
frag = new GridViewFragment();
ft.replace(R.id.fl_view, frag,GridViewFragment.TAG);
}
ft.commit();
}
}
So, can anybody help me out regarding what should be done to load the previous set of images on coming back to gridview fragment instead of having the default images of Set1.