The fragment shows up by default but I wanted it to be hidden/invisible until I click this button. The problem that I am experiencing is that when I click this button, the fragment won't show up. I'm a complete beginner when it comes to fragments.
My codes in my Main Activity:
package com.example.julian.tutorial_fragment;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity implements TopSectionFragment.TopSectionListener{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
View frag = findViewById(R.id.fragment3);
frag.setVisibility(View.GONE);
}
//This gets called by the TopFragment when the user clicks the button
#Override
public void createMeme(String top, String bottom) {
BottomPictureFragment bottomFragment = (BottomPictureFragment)getSupportFragmentManager().findFragmentById(R.id.fragment2);
bottomFragment.setMemeText(top, bottom);
}
//this is the onButtonClick
public void sample(View view) {
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
Fragment_Search hello = new Fragment_Search();
fragmentTransaction.add(R.id.fragment3, hello, "HELLO");
fragmentTransaction.commit();
}
}
My codes in Fragment_Search:
package com.example.julian.tutorial_fragment;
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;
/**
* Created by Julian on 8/17/2017.
*/
public class Fragment_Search extends Fragment {
public interface Fragment_SearchInterface {
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.sample_layout, container, false);
return view;
}
}
My activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="com.example.julian.tutorial_fragment.MainActivity">
<RelativeLayout
android:layout_width="377dp"
android:layout_height="498dp"
tools:layout_editor_absoluteY="8dp"
tools:layout_editor_absoluteX="8dp">
<fragment
android:id="#+id/fragment2"
android:name="com.example.julian.tutorial_fragment.BottomPictureFragment"
android:layout_width="250dp"
android:layout_height="250dp"
tools:layout="#layout/bottom_picture_fragment"
tools:layout_editor_absoluteX="67dp"
tools:layout_editor_absoluteY="223dp"
android:layout_marginBottom="30dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" />
<fragment
android:id="#+id/fragment"
android:name="com.example.julian.tutorial_fragment.TopSectionFragment"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:layout="#layout/top_section_fragment"
tools:layout_editor_absoluteX="42dp"
tools:layout_editor_absoluteY="16dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/fragment2"
android:layout_alignStart="#+id/fragment"
android:text="Button"
android:onClick="sample"/>
<fragment
android:id="#+id/fragment3"
android:name="com.example.julian.tutorial_fragment.Fragment_Search"
android:layout_width="300dp"
android:layout_height="300dp"
android:layout_below="#+id/button2"
android:layout_marginTop="92dp"
android:layout_toStartOf="#+id/button2" />
</RelativeLayout>
</android.support.constraint.ConstraintLayout>
change your sample function and add this
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.your_layout, new Fragment_Search())
.addToBackStack(null)
.commit();
Related
I have just started with android fragment and git stuck while implementing an example from internet.Attaching the following code below.It would be really grate to get some help.
I am getting a error at the line ft.add(R.id.fragmentone,fragment).
Regards.
MainActivity.java
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void getfragment(View view) {
FragmentOne fragment = new FragmentOne();
FragmentManager fm=getFragmentManager();
FragmentTransaction ft=fm.beginTransaction();
ft.add(R.id.fragmentone,fragment);
}
}
FragmentOne.java
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FragmentOne extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_fragment_one, container,false);
}
}
Activity_main.xml
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.vighnesh.fragmentsexp.MainActivity"
android:orientation="vertical">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/buttonfragment"
android:layout_margin="20dp"
android:text="Click to open fragment"/>
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/fragmentone"
android:layout_margin="20dp">
</fragment>
</LinearLayout>
fragment_fragment_one.xml
<FrameLayout 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="com.example.vighnesh.fragmentsexp.FragmentOne">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/hello_blank_fragment" />
</FrameLayout>
Replace this code in your activity.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getfragment();
}
public void getfragment() {
FragmentOne fragment = new FragmentOne();
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.add(R.id.fragmentone, fragment);
ft.commit();
}
change it.
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnFragOne = (Button)findViewById(R.id.buttonfragment);
btnFragOne.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentOne fragment = new FragmentOne();
FragmentManager fm=getFragmentManager();
FragmentTransaction ft=fm.beginTransaction();
ft.add(R.id.fragmentone,fragment); getfragment();
}
});
}
}
So use getSupportFragmentManager() instead of getFragmentManager()
Because the FragmentOne is from the support library (android.support.v4.app.Fragment) not from the framework (android.app.Fragment), you need to use android.support.v4.app.FragmentManager to do transaction with FragmentOne.
I'm new to android I got stuck at navigating from one fragment to other fragment onclick of a button. In my fragment_chat.xml there are two button one is for chatManager and other is for navigate to other fragment.The problem is when I click navigate button(Button) the app is not responding. Here is my code
ChatFragment.java
package com.example.android.wifidirect.discovery;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
/**
* This fragment handles chat related UI which includes a list view for messages
* and a message entry field with send button.
*/
public class WiFiChatFragment extends Fragment {
private android.support.v4.app.FragmentActivity context;
private View view;
private ChatManager chatManager;
private TextView chatLine;
private ListView listView;
ChatMessageAdapter adapter = null;
private List<String> items = new ArrayList<String>();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_chat, container, false);
chatLine = (TextView) view.findViewById(R.id.txtChatLine);
listView = (ListView) view.findViewById(android.R.id.list);
adapter = new ChatMessageAdapter(getActivity(), android.R.id.text1,
items);
listView.setAdapter(adapter);
view.findViewById(R.id.button1).setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View arg0) {
if (chatManager != null) {
chatManager.write(chatLine.getText().toString()
.getBytes());
pushMessage("Me: " + chatLine.getText().toString());
chatLine.setText("");
chatLine.clearFocus();
}
}
});
view.findViewById(R.id.Button).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
android.support.v4.app.Fragment fragment = new TopRatedFragment();
android.support.v4.app.FragmentManager fragmentManager = context.getSupportFragmentManager();
android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.infotraffic, fragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();``
}
});
return view;
}
chat_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="50dip"
android:layout_marginTop="50dp"
android:transcriptMode="alwaysScroll" >
<!-- Preview: listitem=#android:layout/simple_list_item_1 -->
</ListView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dip"
android:layout_gravity="bottom" >
<EditText
android:id="#+id/txtChatLine"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_weight="0.90"
android:focusableInTouchMode="true"
android:hint="#string/txt_hint"
android:visibility="visible" >
</EditText>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_weight="0.10"
android:text="#string/btn_send" />
</LinearLayout>
<Button
android:id="#+id/Button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/gps_location" />
</FrameLayout>
Try to replace this line of your code:
android.support.v4.app.Fragment fragment = new TopRatedFragment();
android.support.v4.app.FragmentManager fragmentManager = context.getSupportFragmentManager();
android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.infotraffic, fragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
With this code:
TopRatedFragment fragment = new TopRatedFragment();
FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
transaction.add(R.id.infotraffic, fragment);
transaction.addToBackStack(null);
transaction.commit();
I have a fragment(A) , where another fragment(B) is being opened . When I press back button it just refreshes the fragment(B) instead of exiting from it and returning to fragment A.
I tried poping back the fragment A in the Activity's onBackPressed callback method but it didn't change a thing :
#Override
public void onBackPressed() {
if(B.active)
{
mFragmentManager.popBackStack( A.TAG , 0);
B.active = false;
}
}
** the active boolean is just something I added as part of the solution. It's initialized to TRUE once the fragment is instantiated.
I don't know how to commit a project!
package com.example.a;
import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
import butterknife.ButterKnife;
import butterknife.InjectView;
/**
* Created by 77930 on 2015/11/9.
*/
public class ActivityA extends AppCompatActivity{
#InjectView(R.id.c)
LinearLayout c;
#InjectView(R.id.btn)
TextView btn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.c);
ButterKnife.inject(ActivityA.this);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.e, FragA.newInstance(), "A");
// fragmentTransaction.addToBackStack("A");
fragmentTransaction.commitAllowingStateLoss();
}
});
}
}
package com.example.a;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import butterknife.ButterKnife;
import butterknife.InjectView;
/**
* Created by 77930 on 2015/11/10.
*/
public class FragA extends Fragment{
private View rootView;
public static FragA newInstance() {
return new FragA();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public FragA() {
}
#InjectView(R.id.a)
LinearLayout a;
#InjectView(R.id.btn)
TextView btn;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fraga,container,false);
ButterKnife.inject(this,rootView);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.e, FragB.newInstance(), "B");
fragmentTransaction.addToBackStack("B");
fragmentTransaction.commitAllowingStateLoss();
}
});
return rootView;
}
}
package com.example.a;
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.LinearLayout;
import android.widget.TextView;
import butterknife.ButterKnife;
import butterknife.InjectView;
/**
* Created by 77930 on 2015/11/10.
*/
public class FragB extends Fragment{
private View rootView;
public static FragB newInstance() {
return new FragB();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public FragB() {
}
#InjectView(R.id.b)
LinearLayout b;
#InjectView(R.id.btn)
TextView btn;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragb,container,false);
ButterKnife.inject(this, rootView);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
getActivity().getSupportFragmentManager().popBackStackImmediate();
}
});
return rootView;
}
}
<?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:id="#+id/c"
android:background="#4b14b1"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/e"
android:layout_width="match_parent"
android:layout_height="300dp">
</FrameLayout>
<TextView
android:id="#+id/btn"
android:textColor="#ffffff"
android:textSize="100dp"
android:gravity="center"
android:text="c"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
<?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:id="#+id/a"
android:background="#4b14b1"
android:layout_height="match_parent">
<TextView
android:id="#+id/btn"
android:textColor="#ffffff"
android:textSize="100dp"
android:gravity="center"
android:text="A"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
<?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:id="#+id/b"
android:background="#4b14b1"
android:layout_height="match_parent">
<TextView
android:id="#+id/btn"
android:textColor="#ffffff"
android:textSize="100dp"
android:gravity="center"
android:text="B"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
I'm trying to learn fragments on android and my code is not working.
FragmentCustomAnimations contains MainActivity.
What i want is the frame MainActivity to change when i push the button on MainActivity.
The error message on logcat is Could not find a method sendMessage(View) in the activity class com.example.myfirstapp.FragmentCustomAnimations for onClick handler on view class android.widget.Button with id 'button1'
Eventhough there is no function sendmessage in all my file.
FYI, its working when i put the button on FragmentCustomAnimations.
Is it impossible to use the button on fragment to trigger action to change the fragment itself?
Here is the code:
FragmentCustomAnimations.java
package com.example.myfirstapp;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FragmentCustomAnimations extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_stack);
if (savedInstanceState == null) {
Fragment newFragment = InitialFragment.newInstance();
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.add(R.id.simple_fragment, newFragment).commit();
}
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
public static class InitialFragment extends Fragment {
static InitialFragment newInstance() {
InitialFragment f = new InitialFragment();
Bundle args = new Bundle();
f.setArguments(args);
return f;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_main, container, false);
return v;
}
}
}
fragment_stack.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:padding="4dip"
android:gravity="center_horizontal"
android:background="#drawable/window2x"
android:layout_width="match_parent" android:layout_height="match_parent">
<FrameLayout
android:id="#+id/simple_fragment"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1">
</FrameLayout>
</LinearLayout>
MainActivity.java
package com.example.myfirstapp;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
public class MainActivity extends Activity implements OnClickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button inner = (Button) findViewById(R.id.button1);
inner.setOnClickListener(this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu items for use in the action bar
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
getActionBar().setDisplayShowHomeEnabled(false);
return super.onCreateOptionsMenu(menu);
}
#Override
public void onClick(View v) {
addFragmentToStack();
}
void addFragmentToStack() {
Fragment newFragment = CountingFragment.newInstance();
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.setCustomAnimations(R.animator.fragment_slide_left_enter,
R.animator.fragment_slide_left_exit,
R.animator.fragment_slide_right_enter,
R.animator.fragment_slide_right_exit);
ft.replace(R.id.simple_fragment, newFragment);
ft.addToBackStack(null);
ft.commit();
}
public static class CountingFragment extends Fragment {
static CountingFragment newInstance() {
CountingFragment f = new CountingFragment();
Bundle args = new Bundle();
f.setArguments(args);
return f;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_display_message, container, false);
return v;
}
}
}
activity_main.xml
<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:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="?android:attr/actionBarSize"
android:layout_gravity="center_vertical"
tools:context=".MainActivity" >
<EditText
android:id="#+id/edit_message"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="#string/edit_message"
android:layout_gravity="center_vertical"
android:inputType="textPersonName" >
<requestFocus />
</EditText>
<EditText
android:id="#+id/editTextEmail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="#string/editTextEmail"
android:inputType="textEmailAddress" />
<EditText
android:id="#+id/editTextPassword"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="#string/editTextPassword"
android:inputType="textPassword" />
<Button
android:id="#+id/button1"
style="#style/CodeFont"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:background="#drawable/custom_button"
android:text="#string/button_send" />
</LinearLayout>
I have a fragment with the following layout: my_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/appName"
android:id="#+id/textView" android:layout_gravity="center"
android:layout_margin="5dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button1"
android:id="#+id/button1"
android:layout_gravity="center"/>
and corresponding MyFragment.java
package com.example.appdemo;
import android.os.Bundle;
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.Toast;
public class MyFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.top_bar, container, false);
Button button1 = (Button)view.findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Toast.makeText(getActivity(), "Button Pressed", Toast.LENGTH_SHORT).show();
}
});
return view;
}
}
and this is hosted inside MainActivity.java
package com.example.appdemo;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
public class MainActivity extends FragmentActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
with the following layout 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" >
<fragment
android:id="#+id/fragment"
android:name="com.example.appdemo.MyFragment"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
Now, my question is why does this only work when I extend FragmentActivity? I'd like to extend Activity. How do I accomplish that?
Why does this only work inside a host class that extends FragmentActivity?
Because you are inheriting from android.support.v4.app.Fragment instead of android.app.Fragment.