Can anyone help me here? And yes, I know using the error log like this is bad practice. The fragment below does not produce an exception (yet), but it doesn't show at all:
package com.tom.pws;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class MAF extends Fragment {
public View OnCreateView(LayoutInflater inflater,
ViewGroup container, Bundle args) {
View view = inflater.inflate(R.layout.activity_maf, container, false);
Log.e("reached AGAIN", "yay");
return view;
}
}
Here's the main activity:
package com.tom.pws;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.Menu;
public class MainActivity extends FragmentActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.e("reached", "yay");
if (savedInstanceState != null) {
return;
}
MAF maf = new MAF();
FragmentTransaction fm = getSupportFragmentManager().beginTransaction();
fm.add(R.id.lodsamone, maf);
fm.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.main, menu);
return true;
}
}
activity_maf.xml:
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/text_body"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
activity_main.xml:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/lodsamone"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
It seems that OnCreateView will never be reached. What am I missing here?
MAF maf = new MAF();
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.lodsamone, maf).commit();
Is OnCreateView(...) correct?
It is
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
Related
I am trying to jump from one fragment to another fragment. But whenever i click the button to jump on second fragment my app crashes.
Here are my source files. Please help !
I want to Navigate Tab1 to AlertScreen.
Here is Tab1.java
package com.example.bavarian.sos;
import android.content.Context;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
public class Tab1 extends Fragment {
ImageButton HelpButton ;
private boolean playing = false;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.tab1, container, false);
HelpButton = (ImageButton) rootView.findViewById(R.id.imageButton);
final MediaPlayer Alarm = MediaPlayer.create(getContext(),R.raw.sound);
//private boolean playing = false ;
HelpButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Fragment fragment = new AlertScreen();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, fragment);
transaction.addToBackStack(null);
transaction.commit();
}
});
return rootView ;
}
}
AlertScreen.java
package com.example.bavarian.sos;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class AlertScreen extends Fragment {
public AlertScreen(){
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.alert_screen,container,false);
return rootView;
}
}
alert_screen.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Alerrt Screen"
android:id="#+id/alerttext"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="176dp" />
</RelativeLayout>
What i am missing here ???
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.
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"
I created a new Android project in Eclipse with one Blank Activity. In the fragment, I added a TextView called textHello. All I want to do for this test is to modify textHello's text value. But I'm my findViewById is giving me null.
Here is the fragment code:
<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="com.example.gcuitest.MainActivity$PlaceholderFragment" >
<TextView
android:id="#+id/textHello"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
</RelativeLayout>
Here is the MainActivity.java
package com.example.gcuitest;
import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.os.Build;
public class MainActivity extends Activity {
private TextView helloText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
//getFragmentManager().beginTransaction()
// .add(R.id.container, new PlaceholderFragment()).commit();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.container, new PlaceholderFragment());
fragmentTransaction.commit();
}
helloText = (TextView) findViewById(R.id.textHello);
helloText.setText("Gerard");
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
}
Why is findViewById giving me null? Is it in the right place? I've looked at other code samples, and they place findViewById in onCreate, after setContentView, which is what this does. What did I miss? Thanks.
Why is findViewById giving me null?
Because textHello TextView is inside PlaceholderFragment layout instead of Activity which is activity_main.
if you want to access TextView from Fragment layout then use onCreateView as :
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_layout, container, false);
helloText = (TextView)view. findViewById(R.id.textHello);
helloText.setText("Gerard");
return view;
}
I'm new in Android. I wanna create an application that shows an action bar with fixed tabs. I've reached to do this.
The problem is that the tabs don`t fit in the same view.
This is my Main Activity:
package com.pestana.pestana;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuInflater;
import android.app.ActionBar;
import android.app.Fragment;
public class MainActivity extends Activity {
// Declare Tab Variable
ActionBar.Tab Tab1, Tab2, Tab3,Tab4;
Fragment fragmentTab1 = new FragmentTab1();
Fragment fragmentTab2 = new FragmentTab2();
Fragment fragmentTab3 = new FragmentTab3();
Fragment fragmentTab4 = new FragmentTab4();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar actionBar = getActionBar();
// Hide Actionbar Icon
//actionBar.setDisplayShowHomeEnabled(false);
// Hide Actionbar Title
//actionBar.setDisplayShowTitleEnabled(false);
// Create Actionbar Tabs
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Set Tab Icon and Titles
Tab1 = actionBar.newTab().setIcon(R.drawable.tab1);
Tab2 = actionBar.newTab().setText("Tab2");
Tab3 = actionBar.newTab().setText("Tab3");
Tab4 = actionBar.newTab().setText("Tab4");
// Set Tab Listeners
Tab1.setTabListener(new TabListener(fragmentTab1));
Tab2.setTabListener(new TabListener(fragmentTab2));
Tab3.setTabListener(new TabListener(fragmentTab3));
Tab4.setTabListener(new TabListener(fragmentTab4));
// Add tabs to actionbar
actionBar.addTab(Tab1);
actionBar.addTab(Tab2);
actionBar.addTab(Tab3);
actionBar.addTab(Tab4);
}
#Override public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true; /** true -> el menú ya está visible */
}
}
And this is the layout
`
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/fragment_container"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
`
I've created also 4 classes for FragmentTab1... FragmentTab4,
FragmentTab1
package com.pestana.pestana;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.app.Fragment;
public class FragmentTab1 extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragmenttab1, container, false);
return rootView;
}
}
FragmentTab2
package com.pestana.pestana;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.app.Fragment;
public class FragmentTab2 extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragmenttab2, container, false);
return rootView;
}
}
FragmentTab3
package com.pestana.pestana;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.app.Fragment;
public class FragmentTab3 extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragmenttab3, container, false);
return rootView;
}
}
FragmentTab4
package com.pestana.pestana;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.app.Fragment;
public class FragmentTab4 extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragmenttab4, container, false);
return rootView;
}
}
TabListener.java
package com.pestana.pestana;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Fragment;
import android.app.FragmentTransaction;
public class TabListener implements ActionBar.TabListener {
Fragment fragment;
public TabListener(Fragment fragment) {
// TODO Auto-generated constructor stub
this.fragment = fragment;
}
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
ft.replace(R.id.fragment_container, fragment);
}
#Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
ft.remove(fragment);
}
#Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
}
4 XML layout for each fragment this is an example, just have to change Fragment1 for each XML
<?xml version="1.0" encoding="utf-8"?>
<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" >
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="#string/Fragment1" />
</RelativeLayout>
I am stuck for 3 days, any help please?? With the same code can I implement a swipe view with the different tabs?? Thanks in advance
Check the documentation (Creating Swipe Views with Tabs), you can download a working example of how to do exactly what you want.