Develop Reference

How To Call a page using button in Fragment in Android?

public class Menu1 extends Fragment implements View.OnClickListener {
public static Button button_sbm;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
//returning our layout file
//change R.layout.yourlayoutfilename for each of your fragments
/* return inflater.inflate(R.layout.fragment_menu_1, container, false);*/
View myView = inflater.inflate(R.layout.fragment_menu_1, container, false);
button_sbm = (Button) myView.findViewById(R.id.button);
button_sbm.setOnClickListener(this);
return myView;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
//you can set the title for your toolbar here for different fragments different titles
getActivity().setTitle("Home");
}
#Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), MainWeb.class);
startActivity(intent);
}
}
How To Intent To MainWeb Class..
This My XML
<ImageView
android:id="#+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="#drawable/yoga"
android:layout_alignParentTop="true" />
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="30dp"
android:text="Goto Website"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" />
Fragment to Activity
What to do?
When I click the button, it gives me a message
"Unfortantly App Was Stopped"

Make sure your MainWeb Activity class is mentioned in AndroidManifest.xml.
Don't create a static instances of Button or any UI widget in your fragment or Activity. That may lead to memory leak.

FindViewByID Undefined For the Type Android Error

I have been extending from the fragment, but getting a Undefined Error For FindViewByID. Here is the Code
public class hashingfragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_hashing, container, false);
return rootView;
}
public void Hash(View view){
EditText edit_text = (EditText)
getView().findViewById(R.id.editText1);
}
And here is the xml
<EditText
android:id="#+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/textView1"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginTop="17dp"
android:ems="20"
android:inputType="textMultiLine"
android:hint="Enter the Text" >
<requestFocus />
</EditText>

What people are suggesting at in the comments above is:
public class hashingfragment extends Fragment {
// hold on to your EditText
private EditText editText;
#Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_hashing, container, false);
// get your EditText here from the inflated View
editText = (EditText) rootView.findViewById(R.id.editText1);
return rootView;
}
public void Hash(View view){
// now you can use 'editText' however you wish here
}
}

How to inflate view inside fragment

If I try to inflate a view within a fragment I am getting NULL.. For example:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Here I will inflate my view using the layout ID & return.
return view;
}
Whenever a button is clicked I need to create a dynamic view e.g.: button & add to the LinearLayout. I would like to perform this operation inside my fragment class like this:
public void addPlaces() {
Button button = new Button(null);
button.setText("button name");
// e.g. like adding button to enter code here linear layout
linearLayout.addView(button);
}
So, if I get inflate LinearLayout inside onCreateView and use it in add class, I'm getting NULL. How to achieve?

Declare the variable as a instance variable and then initialize Linear Layout
LinearLayout linearLayout;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment1, container, false);
linearLayout = (LinearLayout) rootView.findViewById(R.id.linearlayout);
return rootView;
}
Then
public void addPlaces() {
Button button = new Button(getActivity());
// needs activity context
// fragment hosted by a activity. use getActivity() to get the context of the hosting activity.
button.setText("button name");
linearlayout.addView(button);
}
Example: Modify the below according to your requirement.
fragment1.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" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="Button" />
<LinearLayout
android:layout_width="fill_parent"
android:id="#+id/linearlayout"
android:layout_height="fill_parent"
android:layout_above="#+id/button1"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:orientation="vertical" >
</LinearLayout>
</RelativeLayout>
Myfragment.java
public class Myfragment extends Fragment {
LinearLayout linearLayout;
View rootView;
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Button b = (Button) rootView.findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
addPlaces();
}
});
linearLayout = (LinearLayout) rootView.findViewById(R.id.linearlayout);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment1, container, false);
return rootView;
}
public void addPlaces() {
Button button = new Button(getActivity()); // needs activity context
button.setText("button name");
linearLayout.addView(button);
}
}
Snap shot of my emulator
Edit :
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: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=".MainActivity" >
<fragment android:name="com.example.fragments.Myfragment"
android:id="#+id/frag"
android:layout_above="#+id/button1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="Button" />
</RelativeLayout>
MainActivity.java
public class MainActivity extends FragmentActivity {
Button b;
Myfragment fragment;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragment = new Myfragment();
fragmentTransaction.add(R.id.frag, fragment);
fragmentTransaction.commit();
b = (Button) findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
fragment.addPlaces();
}
});
}
}
Myfragment.java
public class Myfragment extends Fragment {
LinearLayout linearLayout;
View rootView;
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
linearLayout = (LinearLayout) rootView.findViewById(R.id.linearlayout);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment1, container, false);
return rootView;
}
public void addPlaces() {
Button button = new Button(getActivity()); // needs activity context
button.setText("button name");
linearLayout.addView(button);
}
}

SupportMapFragment with a custom layout, possible?

I am trying to have SupportMapFragment with a custom layout, right now the following code works :
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View view = super.onCreateView(inflater, container, savedInstanceState);
// initMap();
return view;
}
But I want to change the onCreateView() method to inflate a different layout, instead of calling the super.onCreateView() method.
To look like something like this:
View view = inflater.inflate(R.layout.fragment, container,false);
mMap = (GoogleMap)view.findViewById(R.id.mapview);
But GoogleMap is not a view so I cannot add it to the xml, like the following way:
<com.google.android.gms.maps.GoogleMap
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mapview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>

If you want to create a SupportMapFragment with a custom layout, I prefer to extend the android.support.v4.app.Fragment from the Support Library and inflate your custom XML with the com.google.android.gms.maps.MapView and other views there.
But be careful to forward the livecycle methods to this MapView as quoted here.

I added a LinearLayout above the map.
I used this layout for the buttons:
<?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="wrap_content"
android:id="#+id/llPlaces"
android:orientation="horizontal"
android:background="#color/ACGris">
<Button android:id="#+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="BUTTON1"/>
<Button android:id="#+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="BUTTON2"/>
<Button android:id="#+id/btn3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="BUTTON3"/>
And then I created a class which extends SupportMapFragment
public class FrgMapas extends SupportMapFragment{
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View viewMain = super.onCreateView(inflater, container, savedInstanceState);
View viewButtons = inflater.inflate(R.layout.layout_buttons, null);
FrameLayout mainChild = (FrameLayout) ((ViewGroup)viewMain).getChildAt(0);
mainChild.addView(viewButtons);
Button btn1 = (Button) viewMain.findViewById(R.id.btn1);
btn1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getActivity(), "TuTa :)", Toast.LENGTH_LONG).show();
}
});
return viewMain;
}
Hope this works for you

com.google.android.gms.maps.MapView is a View that you can embed in your layouts.

You can override onCreateView in the class you derive from SupportMapFragment. You can call super.onCreateView and then insert the result into a custom ViewGroup you inflater or instantiate. Here's some sample code
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
FrameLayout layout = (FrameLayout) inflater.inflate(R.layout.my_layout,
container, false);
View v = super.onCreateView(inflater, container, savedInstanceState);
layout.addView(v, 0);
return layout;
}

Android + ListFragment with a custom view hierarchy

I'm attempting to customize the fragment layout by returning my own view hierarchy from onCreateView(LayoutInflater, ViewGroup, Bundle). This inflates my custom view, but seems to stack the views instead of inflating within, I see everything at once. Any help is appreciated.
MyActivity.java:
public class MyActivity extends FragmentActivity{
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getSupportFragmentManager().findFragmentById(android.R.id.content) == null) {
ArrayListFragment list = new ArrayListFragment();
getSupportFragmentManager().beginTransaction().add(android.R.id.content, list).commit();
}
}
public static class ArrayListFragment extends ListFragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
inflater.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.main, container);
return super.onCreateView(inflater, container, savedInstanceState);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
String List[] = {"Larry", "Moe", "Curly"};
setListAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, List));
}
}
}
main.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"
android:paddingLeft="8dp"
android:paddingRight="8dp">
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="THIS IS A BUTTON" />
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00FF00"
android:layout_weight="1"
android:drawSelectorOnTop="false" />
<TextView
android:id="#android:id/empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF0000"
android:text="No data" />
</LinearLayout>

I wasn't returning the new view within the onCreateView method of the ListFragment class. For instance:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.main, null);
return view;
}
All works well now in the land of Android!

I think you'd better
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.main, container, false);
return root;
}

optimized way and shot code
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.list_alphabet, container, false);
}

getSupportFragmentManager().beginTransaction().add(android.R.id.content, list).commit();
List is not accepted, it's looking for a fragment.

use this pattern, works perfectly!
inflater.inflate(R.layout.list_layout, container, false);
public View inflate (XmlPullParser parser, ViewGroup root, boolean attachToRoot)
attachToRoot Whether the inflated hierarchy should be attached to the root parameter? If false, root is only used to create the correct subclass of LayoutParams for the root view in the XML.