Develop Reference

Previous activity visible under the new fragment

When I call fragment from activity then fragment calling successfully but some part of previous activity is on the top of in fragment, anyone help to correct the code
package com.example.newproject;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import static android.view.View.GONE;
public class ThankYouPageActivity extends AppCompatActivity {
Button thank_continue_btn,thank_track_btn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_thank_you_page);
getSupportActionBar().setTitle("Confirmation");
thank_continue_btn = findViewById(R.id.thank_continue_btn);
thank_track_btn = findViewById(R.id.thank_track_btn);
findViewById(R.id.thank_continue_btn).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
FragmentManager fm = getSupportFragmentManager();
HomeFragment fragment = new HomeFragment();
fm.beginTransaction().replace(R.id.thanku_container, fragment).addToBackStack(null).commit();

set background to white in the root tag of your fragment's xml
background = "#FFFFFF"

The container of your Fragment must be overlapped by your Activity layouts. Please attach the layouts of your Activity and Fragment so that I can help you find your issue.

I had same issues , i fixed it by removing previous fragment while setting new fragment in oncreateview
container.removeAllViews(); before replacing the fragment

R.id.thanku_container - I think it is FrameLayout?
Make it full match_parent. Or set background color like activity.

Using Fragments for ViewPager in Android

Can anyone tell me why this isnt working? I havent changed this file since it worked last but now I get the error below:
import android.app.Fragment;
import android.app.FragmentManager;
import android.os.Bundle;
import android.support.v13.app.FragmentStatePagerAdapter;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
public class MainActivity extends FragmentActivity {
private final static int NUM_PAGES = 2;
private ViewPager mPager;
private ScreenSlidePagerAdapter mAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
// Instantiate a ViewPager and a PagerAdapter.
mPager = (ViewPager) findViewById(R.id.pager);
mAdapter = new ScreenSlidePagerAdapter(getFragmentManager());
mPager.setAdapter(mAdapter);
mPager.setCurrentItem(2);
}
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int i) {
Fragment frag = null;
switch (i) {
case 0:
frag = new PageOneFragment();
break;
case 1:
frag = new PageTwoFragment();
break;
}
return frag;
}
#Override
public int getCount() {
return NUM_PAGES;
}
}
}
The error is on "frag = new PageTwoFragment();" which states "Type mismatch: cannot convert from PageTwoFragment to Fragment".
Maybe I should create two projects from now on, last good version and then current working project. Is this something other people do?
Thanks

The Problem is, that you are mixing Android Fragments how there were introduced in API11 and Fragments from android support library.
You have to use one or the other, but not both.
Change your imports to
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.os.Bundle;
import android.support.v13.app.FragmentStatePagerAdapter;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
And change getFragmentManager() to getSupportFragmentManager().
And it will work using the support lib.
Calling mPager.setCurrentItem(2); with a pager of 2 Fragments crashs, though.
Only 0 and 1 are valid values in your case.

You imported the wrong Fragment.
You need to import android.support.v4.Fragment
Furthermore, your adapter only handles 2 Fragments. Therefore calling
ViewPager.setCurrentItem(2);
will cause problems, since the index for the first fragment is 0.

Android FragmentActivity from inside Fragment

In my Android application I have created a simple Navigation Drawer which calls fragments when an item is clicked. From one of these fragments, I want to call a FragmentActivity (which will make scrollable tabs from within one of my fragments). Is this possible? Can someone please help me. A similar example to what I'm trying to achieve is in Play Music. It has a Navigation Drawer and upon selecting 'My Library' it creates a Fragment with scrollable tabs whilst still having the NavDrawer accessible from that page.
Regards,

import android.app.ActionBar;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import cgg.gov.in.apps.eoffice.source.R;
public class TestTabsinsideFragment extends Fragment
{
View rootView;
public TestTabsinsideFragment ()
{
// Empty constructor required for fragment subclasses
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
getActivity().getActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Apply the layout for the fragment
rootView = inflater.inflate(R.layout.approve_leaves, container, false);
getActivity().setTitle("New tabbed layout inside Fragment :-) ");
ActionBar.TabListener tabListener = new ActionBar.TabListener() {
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
// show the given tab
}
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
// hide the given tab
}
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
// probably ignore this event
}
};
// Add 3 tabs, specifying the tab's text and TabListener
for (int i1 = 0; i1 < 3; i1++) {
getActivity().getActionBar().addTab(
getActivity().getActionBar().newTab()
.setText("Tab " + (i1 + 1))
.setTabListener(tabListener));
}
return rootView;
}
Did this answer your question ??
Include this code in your Fragment and call it from onSelectItem() of Nav-Drawer

Adding extended fragment to Activity

I have been trying to build a Master-Detail f low in android but wanted to change one of the detail fragments to a different fragment. As this is one of my first Android applications, I was just trying to make a picture appear on this new fragment. For this, I built the following two classes
1) Fragment class ( displays the picture to be displayed )
package com.userName.miscapp;
import com.userName.miscapp.dummy.DummyContent;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class PictureFragment extends Fragment {
// Default Copy Constructor for the fragment
public PictureFragment() {
}
#Override
public void onCreate ( Bundle savedInstanceState )
{
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView ( LayoutInflater inflater , ViewGroup container , Bundle savedInstanceState )
{
View rootView = inflater.inflate(R.layout.fragment_simple_picture, container, false);
return rootView;
}
}
2) Activity to display the same
package com.userName.miscapp;
import android.os.Bundle;
import android.app.Activity;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
public class SimplePicture extends FragmentActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getActionBar().setDisplayHomeAsUpEnabled(true);
if (savedInstanceState == null) {
// Create the detail fragment and add it to the activity
// using a fragment transaction.
Bundle arguments = new Bundle();
arguments.putString(ItemDetailFragment.ARG_ITEM_ID,
getIntent().getStringExtra(ItemDetailFragment.ARG_ITEM_ID));
PictureFragment frag = new PictureFragment();
frag.setArguments(arguments);
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.simple_picture_container,frag).commit();
//setContentView(R.layout.activity_simple_picture);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.simple_picture, menu);
return true;
}
}
On compilation, it does not recognize the PictureFragment to be an extension of Fragment class. This is inspite of it being clearly written in the first file. Searching for solutions on Stackoverflow said to extend FragmentActivity instead of Activity and trying to use getSupportFragmentManager() neither of which helped.
PS : Using 11 as the base for the current application.
Any help would be appreciated
Thanks

This is because you are using android.app.Fragment from new API in conjunction with android.support.v4.app.FragmentManager from support library, you should replace import in your PictureFragment from android.app.Fragment to android.support.v4.app.Fragment to make it work.

Android using intent to open a fragment from an activity

I am implementing an app which has a gridview of images in one activity and one fragment for each image which contains the image in full screen. When i click on any of the images in the grid, it should open up the corresponding fragment. However, we cannot use intent to do this.
here is my code
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
// TODO Auto-generated method stub
if(position==0)
{
Intent i=new Intent(Gallery.this,ImageFrag1.class);
startActivity(i);
}
and the fragment is
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class ImageFrag1 extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.imagefrag1, container, false);
}
}
This fragment is bound to an activity ImagesSwipe. SO how do i achieve the transition between grid view item and its corresponding fragment.
Thanks

You don't need one Fragment for one Image. Just reuse one Fragment with an ImageView in it's layout for every Image.
Fragments aren't invoked like Activities through an Intent. They can only exist as part off an Activity, that is what they are designed for. Think about them as a reusable UI-Modul for an Activity. To add a Fragment to an Activity you have to use the FragmentManager and the FragmentTransaction classes, which provide all interactions with Fragments.
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.add(YourFragment.newInstance(), null);
ft.commit();
Have a look at this guide from the Google Docs where the basic things about GridViews are described. In Addition you should read about Fragments. And here is a Tutorial about your approach.

You may want to check out DialogFrament, here is an example.
Instead of using intent you use FramentManager:
if(position==0)
{
FragmentManager fm = getFragmentManager();
ImageFrag1 imageDialog = new ImageFrag1()
ImageFrag1.show(fm, "image_title");
}
And your dialogFrament becomes:
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class ImageFrag1 extends DialogFragment {
public ImageFrag1() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.dialog_fragment, container, false);
}
}