In a fragment if I press back button go to SettingsActivity.class

In a fragment if I press back button go to SettingsActivity.class - android

I have a activity_settings.xml file like below in this file I have 3 text views if I click one it will take me to a fragment
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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.crowderia.chat.SettingsActivity"
android:background="#color/black">
<TextView
android:id="#+id/tv_added_me"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Added Me" />
<TextView
android:id="#+id/tv_add_friends"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add Friends" />
<TextView
android:id="#+id/tv_my_friends"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="My Friends" />
<FrameLayout
android:id="#+id/settings_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</RelativeLayout>
My SettingsActivity.class like below
onclick event for each text view
tv_added_me.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
setFragment(new AddedMeFragment());
}
});
set fragment method
public void setFragment(Fragment f) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out);
fragmentTransaction.replace(R.id.settings_fragment, f);
fragmentTransaction.commit();
}
If I click each text view it will take me to each fragment but after I click back its not going to go to Settings Activity how can I make this work
Please help me Im new to these stuff

You should remove all the fragments from FragmentManager on the click of back button.
FragmentManager fm = getSupportFragmentManager();
for (Fragment f : fm.getFragments()) {
fm.beginTransaction().remove(f).commit();
}

Related

Frame layout inside a fragment

I am working in a Fragment. it contains 2 Buttons and a FrameLayout:
<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="fragments.Fragment_Book_A_Cam">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="2">
<Button
android:id="#+id/bt_Public"
android:layout_width="0dp"
android:layout_height="60dp"
android:layout_weight="1"
android:background="#drawable/red"
android:text="Public Jobs "
android:textColor="#FFFFFF" />
<Button
android:id="#+id/bt_Active"
android:layout_width="0dp"
android:layout_height="60dp"
android:layout_weight="1"
android:background="#drawable/black"
android:text="Active Jobs"
android:textColor="#FFFFFF" />
</LinearLayout>
<FrameLayout
android:id="#+id/Fragment_Jobs_BookACam"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</LinearLayout>
I want to load another Fragment in the FrameLayout on a Button click and don't want to replace the main FrameLayout.
All the methods I have used either crash or replace the main Fragment.
bt_Public.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// fragment = new Fragment_MyCloudVideo();
// FragmentManager fragmentManager = ;
// FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
// fragmentTransaction.replace(R.id.Fragment_MyVideos, fragment);
// fragmentTransaction.commit();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
Fragment_Public_Jobs fragment = new Fragment_Public_Jobs();
fragmentTransaction.addToBackStack("xyz");
fragmentTransaction.hide(Fragment_Book_A_Cam.this);
fragmentTransaction.add(android.R.id.content, fragment);
fragmentTransaction.commit();
}
});

You never seem to use the Fragment_Jobs_BookACam FrameLayout id
If you want to show Fragments inside Fragments, you need to use the method to get the child FragmentManager

First of all correct the errors present in your xml file and try replace() method of fragmentTransaction instead add().

calling a method from a fragment inside a mainactivity

I've been trying to solve this problem for a few days now and still cant figure it out. I've checked many similiar topics about this but didnt get me what I need.
As you can see I'm adding the fragments dynamically:
public void displayFragment1() {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, new Fragment_1(), "frag1");
fragmentTransaction.commit();
}
public void displayFragment2() {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, new Fragment_2(), "frag2");
fragmentTransaction.commit();
}
Here is the part that I cant figure out. I'm searching the fragments by tag and it seems that its not working since I'm always getting nullpointer exception or classexception. Toast just shows the value of the text that I entered so its sending the data from a fragment to the activity. so that part is fine. Any ideas guys???
#Override
public void inputValue(String text) {
if (text != null) {
Toast.makeText(MainActivity.this, text, Toast.LENGTH_SHORT).show();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, new Fragment_2(), "frag2");
fragmentTransaction.commit();
FragmentManager fm = getSupportFragmentManager();
Fragment_2 fragment = (Fragment_2) fm.findFragmentByTag("frag2");
fragment.setChangeTo(text);
} else {
Toast.makeText(MainActivity.this, "didnt recieve the value", Toast.LENGTH_SHORT).show();
}
}
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"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context="com.example.neven.question_for_stackoverflow.MainActivity"
android:background="#drawable/my_background">
<FrameLayout android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/fragment_container">
</FrameLayout>
MainActivity:
public class MainActivity extends AppCompatActivity implements Fragment_1.sendData {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
displayFragment1();
}
fragment 1 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.neven.question_for_stackoverflow.Fragment_1"
android:background="#drawable/my_background">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/hello_blank_fragment"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="fragment 1"
android:id="#+id/textView" android:layout_gravity="center"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/etInputID" android:layout_gravity="center" android:layout_marginTop="50dp"
android:hint="enter text here" android:textColorHint="#e3ca0a"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Send"
android:id="#+id/bSendID" android:layout_gravity="center_horizontal|bottom"
android:layout_marginBottom="130dp"/>
fragment 2 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.neven.question_for_stackoverflow.Fragment_2"
android:background="#drawable/my_background">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/hello_blank_fragment"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="fragment 2 - change me"
android:id="#+id/tvChangeMeID" android:layout_gravity="center"/>

The issue seems to be that you are calling displayFragment1(); in your Activity's onCreate and yet you are expecting to find Fragment_2 which you are only setting/initializing in displayFragment2(); - you never call this method.
So, please change your code in the onCreate method to call displayFragment2() like this:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
displayFragment2();
}
UPDATE:
Please add the call getSupportFragmentManager().executePendingTransactions() after the commit statement and then try looking up the Fragment by TAG and see if this at least returns a Fragment object and not null. Your code will now look like:
...
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, new Fragment_2(), "frag2");
fragmentTransaction.commit();
getSupportFragmentManager().executePendingTransactions()
Fragment_2 fragment = (Fragment_2) getSupportFragmentManager().findFragmentByTag("frag2");
fragment.setChangeTo(text);
I hope this helps.

You should declare a FrameLayout in your Activity's layout xml where the fragments you want will be inflated. Then use that FrameLayout's id when making a transaction instead of android.R.id.content.

The way to handle this is:
Fragment fragment = getActivity().getFragmentManager().findFragmentById(R.id.fragment_container);
if (fragment instanceof YourFragmentClass) {
fragment.setChangeTo(value);
}

Shows nothing when changing the fragment from another fragment

Unable to see anything when changing the fragment from another fragment ,but works fine with selecting the Tab.
Here is my code which I am calling on button click:
With Main Activtyxml and Fragment Xml
private Button btnskip ;
btnskip = (Button)rootView.findViewById(R.id.skipbutton);
btnskip.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(R.id.viewpager_main, new CategoryListingFragment());
transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
transaction.addToBackStack(null);
transaction.commit();
}
});
> **this Main Activity xml file which changes the fragment on Tab click**
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/root_view_main"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.scu.smartgrocerytracker.welcome.WelcomeClassesTabLayout
android:id="#+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/tab_background"
app:tabIndicatorColor="#color/tab_indicator" />
<android.support.v4.view.ViewPager
android:id="#+id/viewpager_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/tab_layout" />
</RelativeLayout>

Activity layout is still visible after adding fragment to the activity

This is a really lame question, but I really cannot figure out why it happens, so please help me out.
I have a simple activity and I add a fragment to it dynamically. The problem is that once the fragment is added to the activity, the activity layout is also visible. Why does this happen?
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnLoad = (Button) findViewById(R.id.btn1);
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
HelloFragment hello = new HelloFragment();
fragmentTransaction.add(R.id.rootView, hello, "HELLO");
fragmentTransaction.commit();
}
};
btnLoad.setOnClickListener(listener);
}
}
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" tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/rootView"
android:orientation="vertical">
<TextView
android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="#+id/btn1"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="OK"/>
</LinearLayout>
</LinearLayout>
HelloFragment.java
public class HelloFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
/** Inflating the layout for this fragment **/
View v = inflater.inflate(R.layout.hello_fragment_layout, null);
return v;
}
}
hello_fragment_layout.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">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="fragment 1"/>
</LinearLayout>

Convention is to have a FrameLayout that you use fragmentTransaction.replace()/add() on.
You shouldn't have views like TextView and Button in your MainActivity layout file. Instead, have those in another fragment and just have a FrameLayout in your MainActivity xml. Load the fragment with TextView/Button first, and call replace on button click with your new fragment.

Set a background color to your fragment linearLayout and make it clickable

The fragment is just another element on the layout. Adding it to the layout does not automatically remove other views. If you want the fragment to replace the content of rootView you need to remove rootview's children views first. Something like:
((LinearLayout)findViewById(R.id.rootView)).removeAllViews();
So your onClick method should look like this:
#Override
public void onClick(View v) {
((LinearLayout)findViewById(R.id.rootView)).removeAllViews();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
HelloFragment hello = new HelloFragment();
fragmentTransaction.add(R.id.rootView, hello, "HELLO");
fragmentTransaction.commit();
}

your rootview work as container for both fragment and your views on activity. check it and make separate view for fragment.

I know it's very late to answer this question but for those who are still looking do the following in your activity layout:
<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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="#+id/btn1"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="OK"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/rootView"
android:orientation="vertical">
</RelativeLayout>
And fragment layout to following:
<?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:background="#color/white" <!--Add this-->
android:layout_height="match_parent">
<TextView
android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="#+id/btn1"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="OK"/>
</LinearLayout>

activity_main.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" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/rootView"
android:orientation="vertical">
<TextView
android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="#+id/btn1"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="OK"/>
</LinearLayout>
<FrameLayout
android:id="#+id/fragmentContainer"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
</FrameLayout>
MainActivity.java
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
HelloFragment hello = new HelloFragment();
fragmentTransaction.add(R.id.fragmentContainer, hello, "HELLO");
fragmentTransaction.commit();
}
};

I have a solution for this to achieve what you can do is make two fragment one for textview and button your showing as default when activity is opened and another which you have already created as HelloFragment.
From Activity onCreate() method call the first fragment with default textview and button and from the click listener of that button call HelloFramgent.
Step1: Crate another fragment with any name MainFragment having a xml layout as follows:-
main_fragment_layout.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">
<TextView
android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="#+id/btn1"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="OK"/>
</LinearLayout>
MainFragment.java - Class
public class MainFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
/** Inflating the layout for this fragment **/
View v = inflater.inflate(R.layout.main_fragment_layout, container, false);
Button btnLoad = (Button) v.findViewById(R.id.btn1);
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View view) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
HelloFragment hello = new HelloFragment();
fragmentTransaction.add(R.id.rootView, hello, "HELLO");
fragmentTransaction.commit();
}
};
btnLoad.setOnClickListener(listener);
return v;
}
}
Step2: Call the MainFragment from activity onCreate() method
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
MainFragment mainFragment = new MainFragment();
fragmentTransaction.add(R.id.rootView, mainFragment, "MAIN_FRAGMENT");
fragmentTransaction.commit();
}

Build your user interface in Fragments (In most cases one Fragment equals one screen) and then use Activities to arrange and display those Fragments.
check this: click here to view detailed answer

You have two linear layouts, one inside another, so you need to do the following steps:
Set id to 1 linear layout rootView and next to the childview.
Find your child view:
View view = findViewById(R.id.child_view);
view.setVisibility(View.INVISIBLE);
Replace your rootView with your fragment:
getSupportFragmentManager().beginTransaction().add(R.id.rootview, new blankFragment())
.addToBackStack(null).commit();
Then override:
#override
public void onBackPressed() {
android.support.v4.app.FragmentManager fm = getSupportFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
view.setVisibility(View.VISIBLE);
}
super.onBackPressed();
}

The Activity views are not being masked against the Fragment's views, so both appear. One solution is to load the fragment into a frame in the main activity's layout which has a slight elevation (2 dp). When the fragment is loaded its base elevation will cause it to always draw over the activity. Set the fragments parent container with a color to hide the activity views.
MasterActivity layout:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Activity Title"
android:layout_marginTop="10dp"
android:layout_marginBottom="20dp"
android:textSize="24sp" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/title"
android:layout_centerHorizontal="true"
android:textAllCaps="false"
android:text="Button1" />
<Button
android:id="#+id/button2"
android:textAllCaps="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/button1"
android:layout_centerHorizontal="true"
android:text="Button2" />
<!-- Fragment holder, with elevation -->
<FrameLayout
android:translationZ="2dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/fragHolder"
/>
The Fragment layout has a background color:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#fff"
android:layout_margin="10dp">
<TextView
android:id="#+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Test Background Task"
android:textSize="24sp" />
</RelativeLayout>

Make your First Layout invisible while calling fragment and again while returning from fragment make your main view visible and remove fragment at that time so it will not conflict with each other it worked for really well just check it once

Replace fragments in Android

I can't replace the fragments using the codes below. I mean that the second fragment appeared under the first fragment. The first fragmnent didn't hide as I expected. What is wrong here?
Thanks a lot!
My activity :
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final FragmentManager fm = this.getFragmentManager();
final Fragment fragmenttwo = new FragmentTwo();
Button fmchangebutton = (Button) this.findViewById(R.id.fmchangebutton);
fmchangebutton.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.fragment1, fragmenttwo);
ft.commit();
}
});
};
};
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="#+id/fmchangebutton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Change Fragment" />
<fragment
android:id="#+id/fragment1"
android:name="com.example.fragementex.FragmentOne"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
fragmnetone.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" >
<EditText
android:id="#+id/editText1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="clip_horizontal"
android:ems="10"
android:gravity="center_vertical|center_horizontal|top|fill_vertical"
android:text="This is Fragment One" >
</EditText>
</LinearLayout>
fragmnettwo.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" >
<EditText
android:id="#+id/editText1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="clip_horizontal"
android:ems="10"
android:gravity="center_vertical|center_horizontal|top|fill_vertical"
android:text="This is Fragment Two" >
</EditText>
</LinearLayout>

You cannot replace a fragment attached to the layout, you need to create a host container as FrameLayout like this:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="#+id/fmchangebutton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Change Fragment" />
<FrameLayout
android:id="#+id/frame_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
Then, you will able to - first - add and display the first fragment and replace it with the second as follows:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// set the layout which contains the framelayout
setContentView(R.layout.activity_main);
final FragmentManager fm = this.getFragmentManager();
final Fragment fragmentone = new FragmentOne();
final Fragment fragmenttwo = new FragmentTwo();
// if first initialization
if(savedInstanceState == null) {
// display with "add" the first fragment
this.getFragmentManager().beginTransaction()
.add(R.id.frame_layout, fragmentone).commit();
}
Button fmchangebutton = (Button) this.findViewById(R.id.fmchangebutton);
fmchangebutton.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
FragmentTransaction ft = fm.beginTransaction();
// "replace" the fragment inside the framelayout
ft.replace(R.id.frame_layout, fragmenttwo);
ft.commit();
}
});
}

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

In a fragment if I press back button go to SettingsActivity.class - android

You should remove all the fragments from FragmentManager on the click of back button. FragmentManager fm = getSupportFragmentManager(); for (Fragment f : fm.getFragments()) { fm.beginTransaction().remove(f).commit(); }

Related

Frame layout inside a fragment

calling a method from a fragment inside a mainactivity

Shows nothing when changing the fragment from another fragment

Activity layout is still visible after adding fragment to the activity

Replace fragments in Android

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