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Intent between 2 fragments not working

I'm using Fragments in my app. One of them has a listView, and when I do a setOnItemClickListener, I want to pass the item clicked to the other fragment...
Here's the class OngletCours where I do my Intent:
l1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Intent a = new Intent(getActivity(), OngletNotes.class);
startActivity(a);
}
});
return rootView;
}
I'm getting the following error when I try to do an Intent to go to another Fragment:
E/AndroidRuntime: FATAL EXCEPTION: main
android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.dasilvadd.students/com.example.dasilvadd.students.OngletNotes}; have you declared this activity in your AndroidManifest.xml?
Here is my Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="Student"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".PageAccueil">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Inscription"
android:label="Student" />
<activity
android:name=".Onglets"
android:label="Student"
android:theme="#style/AppTheme.NoActionBar" />
<activity android:name=".Reglages" />
<activity android:name=".MotDePasse" />
<meta-data
android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />
</application>
I've already tried to add it by myself, but it doesnt recognize the class I created for the Second Fragment (OngletNotes).
Please tell me how to solve this. And thank you in advance !

If you start OngletNotes using startActivity, I assume it's an Activity. In that case you need to add it to the AndroidManifest.xml
<activity
android:name=".OngletNotes"
android:label="Notes" />
If OngletNotes is a Fragment, it should be put inside of the Activity. You can't launch standalone Fragment without an Activity.
You need to create an Activity (don't forget to put it in AndroidManifest.xml)
Put your Fragment inside of the Activity (in xml or programmatically)
Start the Activity using startActivity

# Update: OngletNotes is a fragment
Fragment example:
public static OngletNotes newInstance(/* input parameters if any */) {
OngletNotes fragment = new OngletNotes();
// put values which you want to pass to fragment
// Bundle args = new Bundle();
// fragment.setArguments(args);
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_ongletNotes, container, false);
// if you have passed some data above
// Bundle args = getArguments();
return view;
}
============================================================
# Update:
First, your onCreate in MainActivity,
// create a new instance of OngletCours (example is shown above)
OngletCours OngletCoursFragment = OngletCours.newInstance();
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.fragment_holder, OngletCoursFragment )
.commit();
// and your OnItemClickListener
l1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
OngletNotes targetFragment = OngletNotes.newInstance();
FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
transaction.addToBackStack(null);
transaction.replace(R.id.fragment_holder, targetFragment)
.commit();
}
});
activity_main.xml: you shoud have a FrameLayout which is used as a container to switch fragments
<FrameLayout
android:id="#+id/fragment_holder"
android:layout_width="match_parent"
android:layout_height="match_parent" />

After readed your last comment I have edited my aswer:
Open the fragment:
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
((MainActivity)getActivity()).setCurrentItem (1, true);
}
});
In your MainActivity which contains ViewPager For example private ViewPager mViewPager; you need setCurrentItem method:
public void setCurrentItem (int item, boolean smoothScroll) {
mViewPager.setCurrentItem(item, smoothScroll);
}
I suppose that OngleNotes fragment is the second fragment. That's why I send a 1 as a parameter.

Fragment and FragmentList Android Studio "Unable to start activity ComponentInfo"

I don't know what I'm making wrong, but my App crash when I launch. I want to implement Tab bar list with FragmentActivity.
I really need help :(
The error returned is :
Unable to start activity ComponentInfo
Caused by: java.lang.NullPointerException
at jardelcompany.bundoransurfco.MainActivity.onCreate(MainActivity.java:79)
(line 79 is actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);)
MainActivity.java :
public class MainActivity extends FragmentActivity implements
ActionBar.TabListener {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mSectionsPagerAdapter = new SectionsPagerAdapter(this,
getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager
.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
actionBar.addTab(actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
activity_main.xml :
<RelativeLayout 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"
tools:context=".MainActivity"
android:id="#+id/mainLayout"
android:background="#FFFFFF"> />
<view
android:layout_width="match_parent"
android:layout_height="match_parent"
class="android.support.v4.view.ViewPager"
android:id="#+id/pager"/>
</RelativeLayout>
I use SectionsPagerAdapter for FragmentPageAdapter
SectionsPagerAdapter.java:
public class SectionsPagerAdapter extends FragmentPagerAdapter {
protected Context mContext;
public SectionsPagerAdapter(Context context, FragmentManager fm) {
super(fm);
mContext = context;
}
#Override
public Fragment getItem(int position) {
switch(position) {
case 0:
return new FirstFragment();
case 1:
return new LoginFragment();
}
return null;
}
#Override
public int getCount() {
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return mContext.getString(R.string.title_section1).toUpperCase(l);
case 1:
return mContext.getString(R.string.title_section2).toUpperCase(l);
}
return null;
}
}
FirstFragment.java:
public class FirstFragment extends ListFragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_main,
container, false);
return rootView;
}
}
LoginFragment.java :
public class LoginFragment extends ListFragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_login,
container, false);
return rootView;
}
}
Here is my AndroidManifest.xml :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="jardelcompany.bundoransurfco" >
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.USE_CREDENTIALS" /> <!-- To retrieve the account name (email) as part of sign-in: -->
<uses-permission android:name="android.permission.GET_ACCOUNTS" /> <!-- To auto-complete the email text field in the login form with the user's emails -->
<uses-permission android:name="android.permission.READ_PROFILE" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:screenOrientation="portrait" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".LoginActivity"
android:label="#string/title_activity_login"
android:parentActivityName=".MainActivity"
android:screenOrientation="portrait"
android:windowSoftInputMode="adjustResize|stateVisible" >
</activity>
</application>
</manifest>
And my styles.xml :
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
</style>
</resources>

Remove this code into separate method like:
private void initUI(){
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mSectionsPagerAdapter = new SectionsPagerAdapter(this,
getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager
.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
actionBar.addTab(actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
and call this method from onResume() instead of onCreate(). Also you are using getActionBar() and same time getSupportFragmentManager() maybe you should use getSupportActionBar()? What is the min API level of your project?

Try adding this line of code to your manifest file
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="14" />

How can i add here a webview?

what should I do here working my script, I've tried everything but nothing works.. he give's a error by webview?
package com.dehvb.dehvbapp;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebSettings;
import android.webkit.WebView;
public class ProgrammaFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_programma, container, false);
WebView myWebView = (WebView) findViewById(R.id.webview);
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.loadUrl("http://www.example.com");
return rootView;
}
}

public class ProgrammaFragment extends Fragment {
Webview wv;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_programma, container, false);
wv = (WebView) rootView.findViewById(R.id.yourWebviewId);
//Use the thread policy only if your load URL doesn't work on main thread.
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
wv.loadUrl("http://www.example.com");
return rootView;
}
}
P.s. take off import com.dehvb.deheerenveenseboys.R; from the import, it can cause some problems.

If your have already have webview in your layout file than just use directly!
WebView wb = (WebView)rootView.findViewById(R.id.webView);
wb.loadUrl(url);
replace url with your web url like "https://stackoverflow.com/".
Hope this helped!
EDIT:
First update your manifest exactly like this:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.dehvb.dehvbapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.dehvb.dehvbapp.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
and your ProgrammaFragment.class
public class ProgrammaFragment extends Fragment
{
WebView wv;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View rootView = inflater.inflate(R.layout.fragment_programma, container, false);
wv = (WebView) rootView.findViewById(R.id.WebView1);
//Use the thread policy only if your load URL doesn't work on main thread.
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
wv.loadUrl("https://stackoverflow.com/");
return rootView;
}
}
I have tested it, i can post screenshot if you want!

how can i change layout using onListItemClick() in Android?

I try to to change the layout by clicking my ListView.
This is my Java class.
I have an ArrayList of bus_routes
public class Main extends ListActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setListAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1 ,
getResources().getStringArray(R.array.bus_routes)));
}
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
Intent intent = new Intent(Main.this, Second.class);
startActivity(intent);
}
Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="listview.com"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" /> <application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".Main"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Second"
android:label="#string/title_activity_second" >
</activity>
</application>
Array List
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="bus_routes">
<item>100 Pettah to Panadura</item>
<item>101 Pettah to Moratuwa</item>
<item>102 Kotahena to Moratuwa</item>
<item>103 Fort to Borella</item>
<item>104 Bambalapitya to Wattala</item>
<item>107 Fort to Elakanda</item>
</string-array>
</resources>

When your activity inherits from ListActivity, you're obligated to add a ListView whose id is android.R.id.list into the activity's layout.
From the logs, if your Second Activity's content is not a list, then you must inherit from the Activity instead of ListActivity. If your Second Activity's content is a list, then in your second.xml layout, you must add a ListView item with whose id is android.R.id.list.

NullPointerException while creating activity

this is my codes LoginActivity.java file
package com.example.crims;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.widget.TextView;
public class LoginActivity extends Activity {
TextView screen;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
screen = (TextView) findViewById(R.id.link_to_register);
// Listening to register new account link
screen.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Switching to Register screen
Intent i = new Intent(getApplicationContext(), RegisterActivity.class);
startActivity(i);
}
});
}
}
this is my code for 'activity_login.xml' file
<RelativeLayout 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: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=".LoginActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
</RelativeLayout>`
And Finally this is my menifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.crims"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.crims.LoginActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".RegisterActivity"
android:label="Register New Account">
</activity>
</application>
</manifest>
All of these files are here and i want to find my error as I m new to android app development...

You have NullPointerException(NPE) here:
10-01 21:02:07.580: E/AndroidRuntime(1299):
at com.example.crims.LoginActivity.onCreate(LoginActivity.java:17)
So, check line 17 of LoginActivity.java (you can just double click on this message in the logcat view and you will be navigated to this line).
It seems, line 17 is this:
registerScreen.setOnClickListener(new View.OnClickListener() {
As this is NPE, registerScreen is null. So, you should inspect why it is null. This is because Activity can't find it in line above and it returns null instead:
TextView registerScreen = (TextView) findViewById(R.id.link_to_register);
This can be one of two possibilities: either you do not have widget with id 'link_to_register' in activity_login.xml, or something other is wrong :)
Check this please and show your activity_login.xml file, please.

Listen brother take this code. Change it according to you.
public class MainActivity extends Activity {
TextView screen;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
screen = (TextView) findViewById(R.id.screen);
// Listening to register new account link
screen.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Switching to Register screen
Intent i = new Intent(getApplicationContext(), Register.class);
startActivity(i);
}
});
}
}
You need to register your activity in manifest.xml file too in case if you don't know about it.