Implementing Swipe functionality on portion of screen while using bottom navigation?

Implementing Swipe functionality on portion of screen while using bottom navigation? - java

I am developing my first Android application as part of a college project. I am relatively new to java. My application consists of a bottom navigation, which contains 4 separate pages. Within these pages I have a head section, containing a title, contact button and logout button.
Underneath the head section I wish to have a midsection which will in itself contain 3 swipe panels containing information. Essentially there should be 3 panels for each page, with there being 4 pages (So 4 sets of 3 swipe panels).
This is where I'm having difficulty.. I'm unsure of how to nest the fragments so that only that midsection will be swipe-able. Here is a screenshot of what I have so far:
Screenshot of app
Here is my Code for my MainActivity.java class:
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
private static final String SELECTED_ITEM = "arg_selected_item";
private BottomNavigationView mBottomNav;
private int mSelectedItem;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mBottomNav = (BottomNavigationView) findViewById(R.id.navigation);
mBottomNav.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
selectFragment(item);
return true;
}
});
MenuItem selectedItem;
if (savedInstanceState != null) {
mSelectedItem = savedInstanceState.getInt(SELECTED_ITEM, 0);
selectedItem = mBottomNav.getMenu().findItem(mSelectedItem);
} else {
selectedItem = mBottomNav.getMenu().getItem(0);
}
selectFragment(selectedItem);
}
#Override
protected void onSaveInstanceState(Bundle outState) {
outState.putInt(SELECTED_ITEM, mSelectedItem);
super.onSaveInstanceState(outState);
}
#Override
public void onBackPressed() {
MenuItem homeItem = mBottomNav.getMenu().getItem(0);
if (mSelectedItem != homeItem.getItemId()) {
// select home item
selectFragment(homeItem);
} else {
super.onBackPressed();
}
}
private void selectFragment(MenuItem item) {
Fragment frag = null;
// init corresponding fragment
switch (item.getItemId()) {
case R.id.menu_home:
frag = MenuFragment.newInstance(getString(R.string.text_home),
getString(R.string.test_home));
break;
case R.id.menu_notifications:
//Call to a function that does the stuff here
frag = MenuFragment.newInstance(getString(R.string.text_notifications),
getString(R.string.test_notifications));
break;
case R.id.menu_search:
frag = MenuFragment.newInstance(getString(R.string.text_search),
getString(R.string.test_search));
break;
case R.id.menu_followed:
frag = MenuFragment.newInstance(getString(R.string.text_follow),
getString(R.string.test_follow));
}
// update selected item
mSelectedItem = item.getItemId();
// uncheck the other items.
for (int i = 0; i< mBottomNav.getMenu().size(); i++) {
MenuItem menuItem = mBottomNav.getMenu().getItem(i);
menuItem.setChecked(menuItem.getItemId() == item.getItemId());
}
if (frag != null) {
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.add(R.id.container, frag, frag.getTag());
ft.commit();
}
}
}
Here is the acitivity_main.xml file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:design="http://schemas.android.com/apk/res-auto"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.socialivemusic.socialivetestproject.MainActivity">
<FrameLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="#ff292929">
</FrameLayout>
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="start"
android:layout_weight="0.06"
android:background="#ff000000"
android:textAlignment="center"
design:menu="#menu/bottom_nav_items" />
</LinearLayout>
And here is my MenuFragment.java class:
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import org.w3c.dom.Text;
public class MenuFragment extends Fragment {
private static final String ARG_TEXT = "arg_text";
private static final String ARG_TESTSTRING = "arg_testString";
private String mText;
private String mTest;
private View mContent;
private TextView mTextView;
private TextView mTestView;
private Button contactButton;
private Button logoutButton;
public static Fragment newInstance(String text, String testString) {
Fragment frag = new MenuFragment();
Bundle args = new Bundle();
args.putString(ARG_TEXT, text);
args.putString(ARG_TESTSTRING, testString);
frag.setArguments(args);
return frag;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_menu, container, false);
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// retrieve text and color from bundle or savedInstanceState
if (savedInstanceState == null) {
Bundle args = getArguments();
mText = args.getString(ARG_TEXT);
mTest = args.getString(ARG_TESTSTRING);
} else {
mText = savedInstanceState.getString(ARG_TEXT);
mTest = savedInstanceState.getString(ARG_TESTSTRING);
}
// initialize views
mContent = view.findViewById(R.id.fragment_content);
mTextView = (TextView) view.findViewById(R.id.text);
mTestView = (TextView) view.findViewById(R.id.test);
contactButton = (Button) view.findViewById(R.id.contactButton);
logoutButton = (Button) view.findViewById(R.id.logoutbutton);
// set text and background color
mTextView.setText(mText);
mTestView.setText(mTest);
}
#Override
public void onSaveInstanceState(Bundle outState) {
outState.putString(ARG_TEXT, mText);
outState.putString(ARG_TESTSTRING, mTest);
super.onSaveInstanceState(outState);
}
}
Here is the fragments_menu.xml file:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/fragment_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.socialivemusic.socialivetestproject.MenuFragment">
<LinearLayout
android:layout_width="match_parent"
android:layout_marginLeft="17dp"
android:layout_marginRight="17dp"
android:layout_height="150dp"
android:layout_marginTop="15dp"
android:background="#ff434343"
android:weightSum="1">
<Button
android:text="CONTACT"
android:textColor="#ffffff"
android:layout_width="420dp"
android:layout_marginLeft="10dp"
android:layout_marginStart="10dp"
android:layout_height="90dp"
android:layout_gravity="center"
android:id="#+id/contactButton"
android:layout_weight="0.33"
android:background="#drawable/round_button"
android:textSize="20sp"/>
<TextView
android:id="#+id/text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:layout_gravity="center"
android:textColor="#969696"
android:textSize="40sp"
android:textStyle="bold"
android:layout_weight="0.355"
/>
<Button
android:text="LOGOUT"
android:textColor="#ffffff"
android:layout_width="420dp"
android:layout_height="90dp"
android:layout_gravity="center"
android:id="#+id/logoutbutton"
android:layout_weight="0.33"
android:background="#drawable/logout_button"
android:textSize="20sp"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_marginLeft="17dp"
android:layout_marginRight="17dp"
android:layout_height="match_parent"
android:layout_marginBottom="15dp"
android:layout_marginTop="185dp"
android:background="#ff434343">
<TextView
android:id="#+id/test"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</RelativeLayout>
The second LinearLayout in the above file is the one which should be the swipe-panel. The only other files on the project are xml files dealing with layout of the bottom navigation bar itself, so not relevant to the trouble I'm having.
Does anyone have any recommendations on how to approach this? A helping hand on how to start this part of the project would be amazing! Thanks in advance!

Related

Cannot see widgets in tab layout in android studio

I am facing the problem of cannot see widgets in tab layouts. I have created textview and button in Overview Fragment but I cannot see them when run code. Is it right to initialize textviews and buttons in oncreateview() of fragment which we don't want to transfer to another tab. I have searched a lot about my problem but cannot get any hint. Code is given below:
package com.example.progluattempt;
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager.widget.ViewPager;
import android.os.Bundle;
import com.google.android.material.tabs.TabItem;
import com.google.android.material.tabs.TabLayout;
public class GlucosePlotterTips extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_glucose_plotter_tips);
TabLayout Tablayout1 = findViewById(R.id.Tablayout1);
TabItem OverviewTab = findViewById(R.id.Overviewtab);
TabItem HistoryTab = findViewById(R.id.Historytab);
TabItem TipsTab = findViewById(R.id.Tipstab);
ViewPager Viewpager1 = findViewById(R.id.viewpagery1);
PagerAdapter pagerAdapter = new PagerAdapter(getSupportFragmentManager(), Tablayout1.getTabCount());
Viewpager1.setAdapter(pagerAdapter);
Tablayout1.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
Viewpager1.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
}
//PgeAdapter
package com.example.progluattempt;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
public class PagerAdapter extends FragmentPagerAdapter {
private int numoftabs;
public PagerAdapter(FragmentManager fm, int numoftabs){
super(fm);
this.numoftabs = numoftabs;
}
#NonNull
#Override
public Fragment getItem(int position) {
switch(position){
case 0:
return new OverviewFragment();
case 1:
return new HistoryFragment();
case 2:
return new TipsFragment();
default:
return null;
}
}
#Override
public int getCount() {
return numoftabs;
}
}
//Main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".GlucosePlotterTips">
<com.google.android.material.tabs.TabLayout
android:id="#+id/Tablayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.004">
<com.google.android.material.tabs.TabItem
android:id="#+id/Overviewtab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Overview" />
<com.google.android.material.tabs.TabItem
android:id="#+id/Historytab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="History" />
<com.google.android.material.tabs.TabItem
android:id="#+id/Tipstab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Tips" />
</com.google.android.material.tabs.TabLayout>
<androidx.viewpager.widget.ViewPager
android:id="#+id/viewpagery1"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
//fragmentOverview
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".OverviewFragment">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="183dp"
android:orientation="vertical">
<TextView
android:id="#+id/textViewov2"
android:layout_width="match_parent"
android:layout_height="56dp"
android:text="#string/overview1"
android:textColor="#color/black"
android:textSize="24sp"
android:textStyle="bold" />
<TextView
android:id="#+id/textViewov3"
android:layout_width="match_parent"
android:layout_height="46dp"
android:text="TextView"
android:textColor="#color/black"
android:textSize="18sp" />
</LinearLayout>
<Button
android:id="#+id/buttonov2"
android:layout_width="277dp"
android:layout_height="93dp"
android:layout_gravity="center"
android:text="#string/planner"
android:textColor="#color/black"
android:textSize="24sp"
app:backgroundTint="#color/Yellow" />
//OverviewFragment
package com.example.progluattempt;
import android.content.Intent;
import android.os.Bundle;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
public class OverviewFragment extends Fragment {
TextView Results, Condition;
Button Mybuttonov2;
public OverviewFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_overview, container, false);
Results = (TextView) view.findViewById(R.id.textViewov2);
Intent i =getActivity().getIntent();
String LatestReading=i.getStringExtra("TimeofReading");
Results.setText("Last Checked: " +LatestReading);
//type
Condition = (TextView) view.findViewById(R.id.textViewov3);
String TypeofDiab = i.getStringExtra("Concentration");
Condition.setText("" +TypeofDiab);
//Button
Mybuttonov2 = (Button) view.findViewById(R.id.buttonov2);
//to display conditon of user
if(Condition.getText() != null){
String num;
int numi=0;
num = Condition.getText().toString();
try{
numi = Integer.parseInt(num);
}catch(NumberFormatException ex){
}
if(numi <= 70){
System.out.println("Hypoglycemia");}
else if(numi >=70 & numi <= 140){
System.out.println("Fine");}
else if(numi>140 & numi <200){
System.out.println("Prediabetes");}
else {
System.out.println("Hyperglycemia");
}
}
//to add click event for button
Mybuttonov2.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
Intent i3 = new Intent(getActivity(), SensorScreen.class );
startActivity(i3);
}
});
return view;
}
}
Logcat
When run emulator

I want to open new activity on on-click for gridview

I am new to android. I have created material design Grid View. Now what I want to do, when I click on each grid view it should take to me each new activity. When i click on ALPHABETS it will go to ListAlphabet.java. Thank you for help.
My activity_main.xml is :
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/android_coordinator_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:id="#+id/appbar_layout"
android:layout_height="#dimen/app_bar_height"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar_android_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="#dimen/expanded_toolbar_title_margin_start"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:id="#+id/image_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerInside"
android:src="#drawable/code"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.7" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:id="#+id/nestedscrollview"
android:layout_height="match_parent"
android:fillViewport="true"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<GridView
android:id="#+id/grid"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:columnWidth="100dp"
android:gravity="center"
android:listSelector="#00000000"
android:numColumns="auto_fit"
android:stretchMode="columnWidth" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>
gridview_custom_layout.xml is :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/android_gridview_custom_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
android:padding="10dp">
<com.andexert.library.RippleView
android:id="#+id/more"
rv_centered="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
app:rv_color="#fff"
app:rv_rippleDuration="200">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/linearLayout"
android:orientation="vertical">
<ImageView
android:id="#+id/gridview_image"
android:layout_width="80dp"
android:layout_height="80dp"
android:src="#mipmap/ic_launcher" />
<TextView
android:id="#+id/gridview_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/grid_image"
android:layout_marginTop="10dp"
android:gravity="center"
android:text="Grid View Item"
android:textColor="#444"
android:textSize="12sp"
android:textStyle="bold" />
</LinearLayout>
</com.andexert.library.RippleView>
</LinearLayout>
MainActivity.java is :
package com.affinityapp.sj.alphabet;
import android.content.Context;
import android.os.Bundle;
import android.support.design.widget.CollapsingToolbarLayout;
import android.support.design.widget.CoordinatorLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.widget.GridView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
Toolbar toolbar;
CollapsingToolbarLayout collapsingToolbarLayoutAndroid;
CoordinatorLayout rootLayoutAndroid;
GridView gridView;
Context context;
ArrayList arrayList;
public static String[] gridViewStrings = {
"ALPHABETS",
"NUMBERS",
"MONTH",
"DAYS",
"ANIMALS",
"CALL US",
};
public static int[] gridViewImages = {
R.drawable.icon_alphabet,
R.drawable.icon_number,
R.drawable.icon_calendar,
R.drawable.icon_days,
R.drawable.icon_animal,
R.drawable.icon_call
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
gridView = (GridView) findViewById(R.id.grid);
gridView.setAdapter(new CustomAndroidGridViewAdapter(this, gridViewStrings, gridViewImages));
initInstances();
}
private void initInstances() {
rootLayoutAndroid = (CoordinatorLayout) findViewById(R.id.android_coordinator_layout);
collapsingToolbarLayoutAndroid = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar_android_layout);
collapsingToolbarLayoutAndroid.setTitle("e-Learning");
}
}
CustomAndroidGridViewAdapter.java is :
package com.affinityapp.sj.alphabet;
/**
* Created by SJ on 23-01-2017.
*/
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
/**
* Created by HP on 5/11/2016.
*/
public class CustomAndroidGridViewAdapter extends BaseAdapter {
private Context mContext;
private final String[] string;
private final int[] Imageid;
public CustomAndroidGridViewAdapter(Context c,String[] string,int[] Imageid ) {
mContext = c;
this.Imageid = Imageid;
this.string = string;
}
#Override
public int getCount() {
return string.length;
}
#Override
public Object getItem(int p) {
return null;
}
#Override
public long getItemId(int p) {
return 0;
}
#Override
public View getView(int p, View convertView, ViewGroup parent) {
View grid;
LayoutInflater inflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
grid = new View(mContext);
grid = inflater.inflate(R.layout.gridview_custom_layout, null);
TextView textView = (TextView) grid.findViewById(R.id.gridview_text);
ImageView imageView = (ImageView)grid.findViewById(R.id.gridview_image);
textView.setText(string[p]);
imageView.setImageResource(Imageid[p]);
} else {
grid = (View) convertView;
}
return grid;
}
}

So, you can use this way to click grid view:
public class MainActivity extends AppCompatActivity {
Toolbar toolbar;
CollapsingToolbarLayout collapsingToolbarLayoutAndroid;
CoordinatorLayout rootLayoutAndroid;
GridView gridView;
Context context;
ArrayList arrayList;
public static String[] gridViewStrings = {
"ALPHABETS",
"NUMBERS",
"MONTH",
"DAYS",
"ANIMALS",
"CALL US",
};
public static int[] gridViewImages = {
R.drawable.icon_alphabet,
R.drawable.icon_number,
R.drawable.icon_calendar,
R.drawable.icon_days,
R.drawable.icon_animal,
R.drawable.icon_call
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
gridView = (GridView) findViewById(R.id.grid);
gridView.setAdapter(new CustomAndroidGridViewAdapter(this, gridViewStrings, gridViewImages));
initInstances();
gridView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
// Do whatever you want, like start new Activity or display new view or display dialog box or display just message
Toast.makeText(MainActivity.this, "" + position, Toast.LENGTH_SHORT).show();
}
});
}
private void initInstances() {
rootLayoutAndroid = (CoordinatorLayout) findViewById(R.id.android_coordinator_layout);
collapsingToolbarLayoutAndroid = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar_android_layout);
collapsingToolbarLayoutAndroid.setTitle("e-Learning");
}
}
Hope, this will help you.

Implement onItemClickListener method in you activity:
gridview.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
final Intent intent;
switch(position)
{
case 0:
intent = new Intent(context, FirstActivity.class);
break;
case 1:
intent = new Intent(context, SecondActivity.class);
break;
...
default:
intent = new Intent(context, DefaultActivity.class);
break;
}
startActivity(intent);
}
});

Possibly duplicate question...
Research thoroughly before posting a question please.
Answer can be found in this thread: How can I give an imageview click effect like a button on Android?
Edit:
In your current activity, you need to create a variable ImageButton.
ImageButton myButton = (ImageButton) findViewById(R.id.the_button_you_created_on_the_layout.xml);
Then you need to set a click listener to this button
myButton.setOnClickListener(new View.OnClickListner(){
// When the button is pressed/clicked, it will run the code below
#Override
public void onClick()
// Intent is what you use to start another activity
Intent myIntent = new Intent(this, YourActivity.class);
startActivity(intent);
}
});

saving & reloading edittext value when switching between fragments

java & Two.java)
into each fragments there's editext:
One : editText_One
Two : editText_Two
How to save and resotre editText_One (and editText_Two), when i switch between fragments?
I've tried several things after reading tutos, but nothing working well ;(
One.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/tv_one"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="one" />
<EditText
android:layout_width="237dp"
android:layout_height="wrap_content"
android:inputType="date"
android:ems="10"
android:id="#+id/editText_One"
android:text="blabla"
android:layout_gravity="center_horizontal" />
</LinearLayout>
Two.xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/tv_one"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="TWO" />
<EditText
android:layout_width="237dp"
android:layout_height="wrap_content"
android:inputT`enter code here`ype="date"
android:ems="10"
android:id="#+id/editText_Two"
android:layout_gravity="center_horizontal" />
One.java :
/**
*
*/
package com.example.navigationsubmenu;
/**
* #author info-medios
*
*/
import android.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.TextView;
import java.util.Calendar;
public class One extends Fragment {
// public static final String EXTRA_URL_nommatiere = "url";
EditText editText_one;
// String valeur;
private final String PERSISTENT_VARIABLE_BUNDLE_KEY = "persistentVariable";
public One() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Bundle bundle = new Bundle();
/* Bundle bundle = getActivity().getIntent().getExtras();
Bundle mySavedInstanceState = getArguments();
if (bundle!= null) {// to avoid the NullPointerException
// editText_one.setText("premiere");
String persistentVariable = mySavedInstanceState.getString(PERSISTENT_VARIABLE_BUNDLE_KEY);
editText_one.setText(persistentVariable);
}*/
Bundle extras = getActivity().getIntent().getExtras();
if (extras != null) {
String persistentVariable = extras.getString(PERSISTENT_VARIABLE_BUNDLE_KEY);
editText_one.setText(persistentVariable);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.one, container, false);
//Instancier vos composants graphique ici (faîtes vos findViewById)
editText_one = (EditText) view.findViewById(R.id.editText_One); //getview marche aussi
/* Bundle extras = getActivity().getIntent().getExtras();
if (extras != null) {
valeur = extras.getString(EXTRA_URL_nommatiere); //Affiche le nom matiere
}
else
{
}
editText_one.setText(valeur );*/
return view;
}
#Override
public void onPause() {
super.onPause();
String persistentVariable = editText_one.getText().toString();
Intent intent = new Intent(getActivity(), One.class);
intent.putExtra(persistentVariable, PERSISTENT_VARIABLE_BUNDLE_KEY);
//startActivity(intent);
getArguments().putString(persistentVariable, PERSISTENT_VARIABLE_BUNDLE_KEY);
}
/* #Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Bundle extras = getActivity().getIntent().getExtras();
if (savedInstanceState != null) {
// Restore last state for checked position.
valeur = extras.getString(EXTRA_URL_nommatiere);
}
}
#Override
public void onSaveInstanceState(Bundle savedInstanceState) {
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putString("TEXT", valeur);
}*/
/* #Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
Log.v(TAG, "Inside of onRestoreInstanceState");
valeur = extras.getString(EXTRA_URL_nommatiere);
}*/
}
Can someone can help me please,
many thnaks

First you need to attach the fragments to activity then you can simply define two strings String one ,String two in the activity containing the fragments and assign the value of each editText to diffrent one
i.e
String one=editTextOne.getText.toString();
String two=editTextTwo.getText.toString();

When you have to switch between either activities or fragments, you can use Shared Preferences to store a small amount of datas and retrieve them.
Shared Prefs are small sets of key/value pairs.
Write
SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.();
editor.putInt(getString(R.string.saved_high_score), newHighScore);
editor.commit();
Read
SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
int defaultValue = getResources().getInteger(R.string.saved_high_score_default);
long highScore = sharedPref.getInt(getString(R.string.saved_high_score), defaultValue);
You can write and read any primitive data types such as Strings using put[Type] and get[Type] methods.
Source codes above come from the official android developer training and belongs to Android.
"is there a way with saveInstanceState ?"
I think this bundle is usefull when one activity is destroyed and created by Screen rotation or resumed after a call, but not when switching between activities and fragments.
But you can try it. I know that views like EditText with id have a built-in saveInstanceState so you do not have to handle it manually.
To switch between fragments you can use activity class scoped properties. You will need to add interfaces to your fragments to allow them to communicate with the activity.
EXAMPLE
The following example shows how to switch between fragments and keep EditText values.
The MainActivity contains a FrameLayout and two buttons. The fragment transaction is done on button click events.
Fragments include an interface to communicate with the activity. Each time the EditText value is changed, the activity's property is updated.
The activity communicates with the fragment to set EditText value right after the transaction.
First of all, here are xml layouts files for the MainActivity, the FragmentA and the FragmentB classes :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="100"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="morbak.stackoverflow.fragmentcommunication.MainActivity">
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="50"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="50"
android:orientation="horizontal"
android:weightSum="100">
<Button
android:id="#+id/button1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="50"
android:text="Fragment A" />
<Button
android:id="#+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="50"
android:text="Fragment B" />
</LinearLayout>
</LinearLayout>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="#+id/etOne"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Fragment A content"/>
</LinearLayout>
fragment_a.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="#+id/etTwo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Fragment B content"/>
</LinearLayout>
fragment_b.xml
Then, here are Fragments A and B classes. Source code is self explanatory.
package morbak.stackoverflow.fragmentcommunication;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
public class FragmentA extends Fragment {
//Views
EditText etOne;
//Fields
String value;
//Listeners
OnFragmentASelectedListener mCallback;
//Context
Context context;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
//Inflate views and layouts
View rootView = inflater.inflate(R.layout.fragment_a, container, false);
etOne = (EditText) rootView.findViewById(R.id.etOne);
//Events
etOne.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
//Execute the interface's abstract method
mCallback.onFragmentASelected(s.toString());
}
#Override
public void afterTextChanged(Editable s) {
}
});
etOne.setText(value);
return rootView;
}
//Set the fragment's field value
public void setEditText(String newValue) {
value = newValue;
}
//Interface
public interface OnFragmentASelectedListener {
public void onFragmentASelected(String value);
}
//Throws an exception if the activity implements FragmentA.OnFragmentASelectedListener, but not the abstract method
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
context = activity;
// This makes sure that the container activity has implemented
// the callback interface. If not, it throws an exception
try {
mCallback = (OnFragmentASelectedListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnFragmentASelectedListener");
}
}
}
FragmentA.java
The same work should be done with FragmentB, but you obviously have to search and replace FragmentA to FragmentB and etOne to etTwo.
Finally, here is the MainActivity who handles fragment transactions and uses fragments' listeners :
package morbak.stackoverflow.fragmentcommunication;
import android.content.Context;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity implements FragmentA.OnFragmentASelectedListener, FragmentB.OnFragmentBSelectedListener {
Button button1;
Button button2;
FragmentTransaction transaction;
FragmentA fragmentA;
FragmentB fragmentB;
String editTextOne;
String editTextTwo;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1 = (Button) findViewById(R.id.button1);
button2 = (Button) findViewById(R.id.button2);
editTextOne = "";
editTextTwo = "";
button1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
transaction = getSupportFragmentManager().beginTransaction();
fragmentA = new FragmentA();
transaction.replace(R.id.fragment_container, fragmentA);
transaction.addToBackStack(null);
transaction.commit();
fragmentA.setEditText(editTextOne);
}
});
button2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
transaction = getSupportFragmentManager().beginTransaction();
fragmentB = new FragmentB();
transaction.replace(R.id.fragment_container, fragmentB);
transaction.addToBackStack(null);
transaction.commit();
fragmentB.setEditText(editTextTwo);
}
});
}
public void onFragmentASelected(String value) {
editTextOne = value;
}
public void onFragmentBSelected(String value) {
editTextTwo = value;
}
}
MainActivity.java

Android image slider text change

I have used this for android image swipe. It's working fine. But I need some customization in it. I need text and button bellow image and text should be change according to image swipe. And the text and button should not swipe.
What I did i put two text view and button on fragment_page.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:gravity="center_horizontal"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:background="#drawable/background"
android:weightSum="1">
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="wrap_content"
android:layout_height="217dp"
android:layout_weight="0.71">
</android.support.v4.view.ViewPager>
<TextView
style="#style/bigFont"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="#+id/textBold"
android:layout_marginTop="20dp"
android:textColor="#color/text_color"
android:layout_centerHorizontal="true"/>
<TextView
style="#style/smallFont"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Medium Text"
android:id="#+id/textsmall"
android:layout_marginTop="20dp"
android:layout_below="#+id/textBold"
android:textColor="#color/text_color"
android:layout_centerHorizontal="true"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="REGISTER NOW"
android:id="#+id/button2"
android:background="#drawable/button_design"
android:textColor="#color/text_color"
android:padding="#dimen/abc_action_bar_content_inset_material"
android:layout_below="#+id/textsmall"
android:layout_centerHorizontal="true"
android:layout_marginTop="60dp" />
</LinearLayout>
here is my class.
package com.example.rocku28.mdt;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
public class Slider extends FragmentActivity {
static final int NUM_ITEMS = 4;
ImageFragmentPagerAdapter imageFragmentPagerAdapter;
ViewPager viewPager;
TextView boldTxt,smallTxt;
Button regButton;
public static final String[] IMAGE_NAME = {"one", "two", "three", "four"};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_pager);
boldTxt = (TextView) findViewById(R.id.textBold);
smallTxt = (TextView) findViewById(R.id.textsmall);
imageFragmentPagerAdapter = new ImageFragmentPagerAdapter(getSupportFragmentManager());
viewPager = (ViewPager) findViewById(R.id.pager);
viewPager.setAdapter(imageFragmentPagerAdapter);
}
public static class ImageFragmentPagerAdapter extends FragmentPagerAdapter {
public ImageFragmentPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public int getCount() {
return NUM_ITEMS;
}
#Override
public Fragment getItem(int position) {
SwipeFragment fragment = new SwipeFragment();
return SwipeFragment.newInstance(position);
}
}
public static class SwipeFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View swipeView = inflater.inflate(R.layout.swipe_fragment, container, false);
ImageView imageView = (ImageView) swipeView.findViewById(R.id.imageView);
Bundle bundle = getArguments();
int position = bundle.getInt("position");
String imageFileName = IMAGE_NAME[position];
int imgResId = getResources().getIdentifier(imageFileName, "drawable", "com.example.rocku28.mdt");
imageView.setImageResource(imgResId);
setText(position);
return swipeView;
}
public void setText(int position){
// here I tried to change text on text view
switch (position){
case 0:
new Slider().boldTxt.setText(R.string.verify_licence);
new Slider().smallTxt.setText(R.string.take_back_picture);
break;
case 1:
// boldTxt.setText(R.string.verify_licence);
// smallTxt.setText(R.string.take_front_picture);
break;
case 2:
// boldTxt.setText(R.string.dashboard);
// smallTxt.setText(R.string.choose_option_to_call);
break;
case 3:
// boldTxt.setText(R.string.helpline);
// smallTxt.setText(R.string.call_call_center);
break;
}
}
static SwipeFragment newInstance(int position) {
SwipeFragment swipeFragment = new SwipeFragment();
Bundle bundle = new Bundle();
bundle.putInt("position", position);
swipeFragment.setArguments(bundle);
return swipeFragment;
}
}
}
check settext method. Here I tried to change text but problem is this context is in another class and it's static so I couldn't able to change it. How could I make it working?

NullPointerException in a Fragment when adding a EditText

I am using a tabbed layout, created using the wizard, and have a fragment ready to go. I have added some EditTexts to my fragment, and am all ready to go, however, when running the app, I get a NullPointerException at my EditText declaration.
Fragment Code:
package com.boreas.snowdaycalculatorsp2;
import android.content.Context;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class AdvancedFragment extends Fragment {
EditText inSnow, durnStorm, pSnow, pTime, fSnow, wSpeed, sGround;
public double inchSnow, durationStorm, peakSnow, peakTime, finalSnow, windSpeed, snowGround, result;
TextView results;
Button calc;
String resInt;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
inSnow = (EditText) getView().findViewById(R.id.inchesSnow);
durnStorm = (EditText)getView().findViewById(R.id.durationStorm);
pSnow = (EditText) getView().findViewById(R.id.peakRate);
pTime = (EditText)getView().findViewById(R.id.peakRateTime);
fSnow = (EditText) getView().findViewById(R.id.finalRate);
wSpeed = (EditText) getView().findViewById(R.id.windSpeed);
sGround = (EditText) getView().findViewById(R.id.snowGround);
results = (TextView) getView().findViewById(R.id.resultView);
calc = (Button) getView().findViewById(R.id.button);
return inflater.inflate(R.layout.advfrag_layout, container, false);
}
}
Fragment XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:background="#000000"
android:layout_height="match_parent">
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="#+id/inchesSnow"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:textColor="#ffffff"
android:textColorHint="#ffffff"
android:hint="Inches of Snow"
android:singleLine="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="#+id/durationStorm"
android:layout_below="#+id/inchesSnow"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:textColor="#ffffff"
android:textColorHint="#ffffff"
android:hint="Duration of Storm"
android:singleLine="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="#+id/peakRate"
android:layout_below="#+id/durationStorm"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:hint="Peak Snow Rate"
android:textColor="#ffffff"
android:textColorHint="#ffffff"
android:layout_alignParentStart="false"
android:singleLine="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="#+id/peakRateTime"
android:layout_below="#+id/peakRate"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:hint="Time of Peak Snow Rate"
android:textColor="#ffffff"
android:textColorHint="#ffffff"
android:singleLine="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberSigned"
android:ems="10"
android:id="#+id/finalRate"
android:layout_below="#+id/peakRateTime"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:textColor="#ffffff"
android:textColorHint="#ffffff"
android:hint="Final Snow Rate"
android:singleLine="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberSigned"
android:ems="10"
android:id="#+id/windSpeed"
android:layout_below="#+id/finalRate"
android:layout_alignParentLeft="true"
android:hint="Wind Speed"
android:textColor="#ffffff"
android:textColorHint="#ffffff"
android:layout_alignParentRight="true"
android:singleLine="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="#+id/snowGround"
android:layout_below="#+id/windSpeed"
android:layout_alignParentLeft="true"
android:hint="Snow Already on Ground"
android:textColor="#ffffff"
android:textColorHint="#ffffff"
android:layout_alignParentRight="true"
android:singleLine="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Calculate"
android:id="#+id/button"
android:layout_below="#+id/snowGround"
android:layout_centerHorizontal="true"
android:layout_marginTop="39dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="#+id/resultView"
android:layout_below="#+id/button"
android:layout_alignRight="#+id/button"
android:layout_marginTop="41dp"
android:layout_alignLeft="#+id/button" />
</RelativeLayout>
Main Activity:
package com.boreas.snowdaycalculatorsp2;
import java.util.Locale;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.FragmentPagerAdapter;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity implements ActionBar.TabListener {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set up the action bar.
final ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// 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.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 each of the sections in the app, add a tab to the action bar.
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 callback (listener) for when
// this tab is selected.
actionBar.addTab(
actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#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 onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
#Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
/**
* 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).
Fragment fragment;
switch (position){
case 0:
fragment = new BasicFragment();
break;
case 1:
fragment = new AdvancedFragment();
break;
default:
throw new IllegalArgumentException("Invalid Section Number");
}
return fragment;
}
#Override
public int getCount() {
// Show 3 total pages.
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return "Basic";
case 1:
return "Advanced";
}
return null;
}
}
}
Any ideas on what is causing the NullPointerException?

Either you should initialize your view using view object using inflater
like this
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.advfrag_layout, container, false);
inSnow = (EditText) view.getView().findViewById(R.id.inchesSnow);
durnStorm = (EditText)view.getView().findViewById(R.id.durationStorm);
pSnow = (EditText)view. getView().findViewById(R.id.peakRate);
pTime = (EditText)view.getView().findViewById(R.id.peakRateTime);
fSnow = (EditText)view. getView().findViewById(R.id.finalRate);
wSpeed = (EditText)view. getView().findViewById(R.id.windSpeed);
sGround = (EditText) view.getView().findViewById(R.id.snowGround);
results = (TextView)view. getView().findViewById(R.id.resultView);
calc = (Button)view. getView().findViewById(R.id.button);
return view;
}
Or you should initialize it in OnActivityCreated like this
#Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
nSnow = (EditText) getView().findViewById(R.id.inchesSnow);
durnStorm = (EditText)getView().findViewById(R.id.durationStorm);
pSnow = (EditText) getView().findViewById(R.id.peakRate);
pTime = (EditText)getView().findViewById(R.id.peakRateTime);
fSnow = (EditText) getView().findViewById(R.id.finalRate);
wSpeed = (EditText) getView().findViewById(R.id.windSpeed);
sGround = (EditText) getView().findViewById(R.id.snowGround);
results = (TextView) getView().findViewById(R.id.resultView);
calc = (Button) getView().findViewById(R.id.button);
}
Note: You are getting error because OnCreateView is trying to execute before OnCreate of Activity has finished .

Change onCreateView to
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.advfrag_layout, container, false);
// inflate the layout
inSnow = (EditText) view.findViewById(R.id.inchesSnow);
// use the inflated view object to initialize edittext
durnStorm = (EditText)view.findViewById(R.id.durationStorm);
pSnow = (EditText) view.findViewById(R.id.peakRate);
pTime = (EditText)view.findViewById(R.id.peakRateTime);
fSnow = (EditText)view.findViewById(R.id.finalRate);
wSpeed = (EditText) view.findViewById(R.id.windSpeed);
sGround = (EditText) view.findViewById(R.id.snowGround);
results = (TextView) view.findViewById(R.id.resultView);
calc = (Button) view.findViewById(R.id.button);
return view; // return view
}

You have to inflate the View in onCreateView
View rootView = inflater.inflate(R.layout.advfrag_layout,
container, false);
inSnow = (EditText) rootView.findViewById(R.id.inchesSnow);
This should fix the problem

You need to initialize the view you are using so it knows where to find your editText.

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