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.
Related
i want to open a fragment from MainActivity where i have gridview.i am new to android and this is the first time to use fragment.
this is my mainactivity:
package com.example.grasu.petrosani;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.design.widget.NavigationView;
import android.support.design.widget.TabLayout;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.ThemedSpinnerAdapter;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener,AdapterView.OnItemClickListener{
private DrawerLayout DrawerLayout;
private NavigationView Drawer;
GridView gridview;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Drawer = findViewById(R.id.nav_view);
Drawer.setNavigationItemSelectedListener(this);
DrawerLayout = findViewById(R.id.drawer_layout);
CategoryAdapter adapter = new CategoryAdapter(this, getSupportFragmentManager());
gridview=findViewById(R.id.album_Gridview);
gridview.setAdapter(new GridViewAdapter(this));
}
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
return false;
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (parent.getId()==R.id.album_Gridview){
switch (position) {
case 0:
}
}
}
}
this is my xml for activity main:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout 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:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<GridView
android:id="#+id/album_Gridview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:numColumns="2"
android:layout_marginTop="10dp">
</GridView>
</FrameLayout>
<android.support.design.widget.NavigationView
android:id="#+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
android:duplicateParentState="true"
app:menu="#menu/drawer_view"/>
</android.support.v4.widget.DrawerLayout>
and this is the fragment i want to open from gridview:
package com.example.grasu.petrosani;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class InfoFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.info, container, false);
return rootView;
}}
i tried with FragmentManager fm = getSupportFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.replace(CurrentClass.this, MainActivity.class); but it didn't work.do I have to modify my mainactivity to extend fragmentActivity?
You can try something like -
Create a New Activity.
Add your Fragment in the above created Activity.
In your GridView Item click, open the New Activity via an Intent like - startActivity(new Intent(MainActivity.this, NewActivity.class));
Follow below code:
FragmentTransaction fragmentTransaction = getSupportFragmentManager()
.beginTransaction();
Fragment profileFragment = new InfoFragment();//the fragment you want to show
profileFragment.setArguments(bundle);
fragmentTransaction
.replace(R.id.content_frame, profileFragment);//R.id.content_frame is the layout you want to replace
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
I saw that there were several questions regarding this topic, but I still can't understand. Android documentation states that you can add a fragment like this:
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); ExampleFragment fragment = new ExampleFragment(); fragmentTransaction.add(R.id.fragment_container, fragment); fragmentTransaction.commit();
but when I tried this to my code it just doesn;t find .add() method...
MainActivity
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MyFragment frag = new MyFragment();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.myContainer, frag);
fragmentTransaction.commit();
}
}
MyFragment
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.TextView;
/**
* A simple {#link Fragment} subclass.
*/
public class MyFragment extends Fragment {
public MyFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.my_fragment, container, false);
return rootView;
}
}
activity_main
<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"
android:id="#+id/myContainer"
tools:context="com.example.alin.lynda_fragments008.MainActivity">
</FrameLayout>
my_fragment
<?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"
tools:context="com.example.alin.lynda_fragments008.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello from a fragment" />
</LinearLayout>
Change getFragmentManager() into getSupportFragmentManager();
You shouldn't have to use the SupportFragmentManager. You most likely have some other issue. The method add is available as per the documentation.
https://developer.android.com/reference/android/app/FragmentTransaction.html#add(int,%20android.app.Fragment)
Are you using Android Studio?
You should be able to see the suggestions of the methods once you type fragmentTransaction.(cmd+space on OSX)
I am new to android and learning fragment instead of multiple, i have problem. when i call planet fragment from friends "java.lang.IllegalStateException: Activity has been destroyed" android runtime FATAL exception occurs here is my code. i saw this page but couldn't figure out how to use it. I will be grateful for any help
fragment_planet.xml
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
android:gravity="center"
android:padding="32dp" />
Friends.java
package com.app.hubara;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Friends extends Fragment {
public Friends() { }
View rootView;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.content_friends, container, false);
MainActivity main = new MainActivity();
main.friends();
return rootView;
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="100dp"/>
<Button
android:id="#+id/display"
android:height="70dp"
android:width="300dp"
android:layout_marginTop="0dp"
android:text="Display"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
MainActivity
package com.app.hubara;
import android.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import java.util.Locale;
import android.app.Fragment;
import android.app.FragmentManager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity {
FragmentManager fragmentManager;
FragmentTransaction fragmentTransaction;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = (Button) findViewById(R.id.display);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Friends frag_friends = new Friends();
fragmentManager = getFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.content_frame, frag_friends);
fragmentTransaction.commit();
}
});
}
public void friends(){
PlanetFragment planetFragment = new PlanetFragment();
fragmentManager = getFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.content_frame, planetFragment);
fragmentTransaction.commit();
}
public static class PlanetFragment extends Fragment {
public PlanetFragment() { }
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_planet, container, false);
int i = getArguments().getInt("Earth");
String planet = getResources().getStringArray(R.array.planets_array)[i];
int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),
"drawable", "Earth");
((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);
getActivity().setTitle(planet);
return rootView;
}
}
}
To access an Activity, you shouldn't do this:
MainActivity main = new MainActivity();
main.friends();
Because this destroys current Activity then instantiates another new Activity.
You can access it appropriately by calling getActivity():
MainActivity main = getActivity();
main.friends();
Note that actually you are recommended to define and use an interface to communicate between Fragment and Activity. If you want to learn further, please refer to the official training.
A repo with example: https://bitbucket.org/troffel/drawer-button-error
I've come across an issue I can't for the life of me figure out. From a much larger project I was able to deduce it into a smaller dummy project.
Problem:
When the app launches, the buttons in the drawer menu works correctly. However, after changing orientation one or more times the buttons all of a sudden require two key presses.
When logging out events, it shows that the eventlistener connected to the clicked views is triggered, however nothing seem to happen on first click.
I added the main files to the post, repo so you can replicate it if interested.
Any help is much appreciated.
Main layout:
</LinearLayout>
<LinearLayout
android:id="#+id/left_drawer"
android:orientation="vertical"
android:layout_width="300dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="#android:color/background_light">
</LinearLayout>
</android.support.v4.widget.DrawerLayout>
layout of initial fragment(category_fragment):
<ListView
android:id="#+id/left_drawer_listview"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:choiceMode="singleChoice"/>
<View
android:layout_height="1dp"
android:layout_width="match_parent"
android:background="#ecebec"/>
<TextView
android:id="#+id/drawer_settings"
android:layout_width="match_parent"
android:layout_height="50dp"
android:textColor="#android:color/black"
android:textSize="20sp"
android:clickable="true"
android:onClick="openSettings"
android:gravity="center_vertical"
android:text="Settings"
android:paddingLeft="10sp"/>
</LinearLayout>
fragment that replaces the initial(preffragment):
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="#+id/settings_checkbox_container"
android:layout_weight="1">
</LinearLayout>
<Button
android:layout_width="match_parent"
android:layout_height="100dp"
android:id="#+id/settings_back"
android:text="Save"
android:layout_weight="1"/>
</LinearLayout>
Mainactivity:
package com.example.testdrawer;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.left_drawer, new CategoryFragment());
fragmentTransaction.commit();
}
public void openSettings(View v){
FragmentManager fmanager = getSupportFragmentManager();
FragmentTransaction ftrans = fmanager.beginTransaction();
PrefFragment prefFragment = new PrefFragment();
ftrans.replace(R.id.left_drawer, prefFragment);
ftrans.commit();
Log.i("test", "Opening settings");
}
}
categoryfragment code:
package com.example.testdrawer;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class CategoryFragment extends Fragment{
#Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View v = inflater.inflate(R.layout.category_fragment, container, false);
//drawer menu
return v;
}
}
Preffragment.java:
package com.example.testdrawer;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
public class PrefFragment extends Fragment{
private Context context;
private View checkbox_container;
private Button settingsBack;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context = getActivity().getApplicationContext();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.preffragment, container, false);
checkbox_container = v;
settingsBack = (Button) v.findViewById(R.id.settings_back);
settingsBack.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
saveSettings();
}
});
//setupSimplePreferencesScreen();
return v;
}
public void saveSettings(){
//setSettings(checkbox_container);
FragmentManager fmanager = getFragmentManager();
FragmentTransaction ftrans = fmanager.beginTransaction();
ftrans.replace(R.id.left_drawer, new CategoryFragment());
ftrans.commit();
Log.i("test", "saving settings");
}
}
OK! This is super weird, but I found the problem.
Using replace(container, fragment) instead of add(container, fragment) in my solved the issue.
The problem was that I was calling add(container, fragment) in my activitys onCreate method. This meant that when an orientation change happened, it would call add(container, fragment) on top of the already existing one.
replace(container, fragment) works because it, logically, replaces the existing one.
A solution that includes using add(container, fragment) would be to have remove(fragment) in my activitys onDestroy method, thus avoiding doable drawing.
Hope it saves someone else some time!
I have 2 fragments . In the first fragment there is a button which on clicking will move to 2 nd fragment. When the screen is rotated in this 2nd fragment,after orientation change I see first fragment instead of 2nd fragment. Can anyone help me in solving this issue?
The code is as below :
Activity code:
package com.andr.fragmentsorientationdemo;
import android.os.Bundle;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.view.Menu;
public class OrientationActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_orientation);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction =
fragmentManager.beginTransaction();
fragmentTransaction.replace(android.R.id.content, new Fragmentone()).commit();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.orientation, menu);
return true;
}
}
<br>Code for FragmentOne <br>
=============================
package com.andr.fragmentsorientationdemo;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
public class Fragmentone extends Fragment{
#Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_one, container, false);
Button b = (Button)v.findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View arg0) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction =
fragmentManager.beginTransaction();
fragmentTransaction.replace(android.R.id.content, new Fragmenttwo()).addToBackStack(null).commit();
}
});
return v;
}
}
<br>code for Fragmenttwo
===================
package com.andr.fragmentsorientationdemo;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
/**
* #author 245742
*
*/
public class Fragmenttwo extends Fragment{
#Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_two, container, false);
Button b = (Button)v.findViewById(R.id.button1);
return v;
}
}
<br>layout file for fragmentone <br>
=====================================
<?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" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
<br> Layout for fragmenttwo
==============================
<?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" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button2222222222" />
</LinearLayout>
Can anyone help me in solving this issue.
Try this-
FragmentManager fragmentManager =null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_orientation);
if(fragmentManager==null){
fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction =
fragmentManager.beginTransaction();
fragmentTransaction.replace(android.R.id.content, new Fragmentone()).commit();
}
}
or else
use this in manifest's activity tag-
android:configChanges="orientation"