Develop Reference

Viewing an image on a Android Fragment

I am having trouble showing an image from the drawable folder on to a fragment.
When I try to show do it, it comes up with a java.lang.NullPointerException.
any help would be appreciated.
This is my code,
public class Fragment4 extends Fragment {
public Fragment4() {
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate (R.layout.fragment4, container, false);
ImageView image = (ImageView)rootView.findViewById(R.id.image);
image.setImageResource(R.drawable.image123);
return rootView;
}
}
XML file
<?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" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>

Your ImageView has no id. Set it as follows,
<ImageView
android:id="#+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

It is because you didn't add id attribute to the image in xml
Try this:
<ImageView
android:id="#+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

How can i add this popup.xml to this fragment?

Hello i want to add a popup window to a fragment i tried a lot of things still nothing i have. If someone helps me it will be great.
Here is my Fragment code;
public class Info extends Fragment {
public Info() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.info, container, false);
}
Here is my fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<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/buttonShowCustomDialog"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show Custom Dialog" />
</LinearLayout>
Here is my popup.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView
android:id="#+id/image"
android:layout_width="wrap_content"
android:src="#drawable/pozitif"
android:layout_height="wrap_content"
android:layout_marginRight="5dp" />
<TextView
android:id="#+id/text"
android:layout_width="wrap_content"
android:text="dfdfdsfs"
android:layout_height="wrap_content"
android:textColor="#000000"
android:layout_toRightOf="#+id/image"/>/>
<Button
android:id="#+id/dialogButtonOK"
android:layout_width="100px"
android:layout_height="wrap_content"
android:text=" Ok "
android:layout_marginTop="5dp"
android:layout_marginRight="5dp"
android:layout_below="#+id/image"
/>
</RelativeLayout>

You can use a DialogFragment.
Instead of extending your Activity with Fragment, use DialogFragment
In on createView of the DailogFragment Activity inflate your layout
View v = inflater.inflate(R.layout.fragment_dialog, container, false);
Find your View elements
TextView Message = (TextView) v.findViewById(R.id.text_view1);
To call your DailogFragment use this
MyDialogFragment dialog = MyDialogFragment.newInstance();
dialog.show(getActivity().getFragmentManager(), "MyDialogFragment");
For more info on this you can check out this link.
https://developer.android.com/reference/android/app/DialogFragment.html

Error with a listView inside a Fragment

I am trying to create a ListView inside a ListFragment. My list is customize, so it has been created with an adapter. But the aplication crass and give me this error your content must have a listview whose id attribute is 'android.r.id.list
This is the ListFragment class:
public static class DummySectionFragment extends ListFragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_section_dummy, container, false);
Vector<String> names=new Vector<String>();
names.add("Alex");
names.add("Julia");
setListAdapter(new MyAdapter(getActivity(), names));
return rootView;
}
}
This is MyAdapter class:
public class MiAdaptador extends BaseAdapter {
private final Activity activ;
private final Vector<String> list;
public MiAdaptador(Activity activ, Vector<String> list) {
super();
this.actividad = activ;
this.list = list;
}
public View getView(int position, View convertView,
ViewGroup parent) {
LayoutInflater inflater = activ.getLayoutInflater();
View view = inflater.inflate(R.layout.adapter_view, null, true);
TextView textView =(TextView)view.findViewById(R.id.titulo);
textView.setText(lista.elementAt(position));
return view;
}
}
My fragment_section_dummy layout:
<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="match_parent"
android:layout_height="wrap_content"
android:text="Name list"
android:gravity="center"
android:layout_margin="10px"
android:textSize="10pt"/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1">
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:drawSelectorOnTop="false" />
<TextView
android:id="#android:id/empty"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>
</LinearLayout>
And my adapter_view layout:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="?android:attr/listPreferredItemHeight">
<TextView android:id="#+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:textAppearance="?android:attr/textAppearanceLarge"
android:singleLine="true"
android:text="title"
android:gravity="center"/>
<TextView android:id="#+id/subtitle"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Other text"
android:layout_below="#id/title"
android:layout_alignParentBottom="true"
android:gravity="center"/>
</RelativeLayout>
How could I solve this problem?

I'm starting to think that you should attach the view your inflating to the root view.
Change the inflation to:
View rootView = inflater.inflate(R.layout.fragment_section_dummy, container, true);
Another option could be to only use the onCreateView() method to inflate the main layout. And use the onStart() method to set the list adapter. This way makes sure Android knows about your custom layout.
Posting a full stacktrace could help solving your problem.

There was others class who extends to ListFrament (like DummySectionFragment) but these didn`t inflate a layout which have a ListView. So I had to change the parent of there class (Fragment instead of ListFragment) and it has solved.
Thanks for your answer

How to programatically add multiple Fragments to activity in android

I am trying to display 6 rows inside a linear layout. I want to do this through fragments as the content will be dynamic and the number of rows will also be dynamic later on. I have the following code but only one row appears on the screen. I have SettingsActivity.java, settings.xml ThemeRowFragment,java and theme_row_layout.xml.
SettingsActivity.java
//imports
public class SettingsActivity extends FragmentActivity {
private int NUM_THEMES = 7;
ThemeRowFragment[] view_themes;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
view_themes = new ThemeRowFragment[NUM_THEMES];
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager
.beginTransaction();
for (int i = 0; i < view_themes.length; i++) {
view_themes[i] = new ThemeRowFragment(COLOR_MAP[i]);
fragmentTransaction.add(R.id.theme_linear_layout, view_themes[i],
"Row" + i);
}
fragmentTransaction.commit();
}
}
settings.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:id="#+id/theme_linear_layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/string_theme"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/string_theme"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#cde21c" />
</LinearLayout>
ThemeRowFragment.java
public class ThemeRowFragment extends Fragment {
private int[] colors;
public ThemeRowFragment(int colors[]) {
super();
this.colors = colors;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.theme_row_layout, container,
false);
return view;
}
}
theme_row_layout.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="horizontal" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/pick_colors" >
</TextView>
</LinearLayout>

Fragments will inflate themselves into the View you add them to. So you really can't do it this way. So you need to have X empty containers, one for each fragment you are going to inflate. Add each fragment to the same container will actually layer them all on top of each other, sort of making them really hard to see and use when the screen renders.
Alternatives:
You could do something like the following:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:id="#+id/theme_linear_layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/string_theme"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/string_theme"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#cde21c" />
<FrameLayout android:id="#+id/fragment_container1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<FrameLayout android:id="#+id/fragment_container2"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<FrameLayout android:id="#+id/fragment_container3"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<FrameLayout android:id="#+id/fragment_container4"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<FrameLayout android:id="#+id/fragment_container5"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<!-- etc. -->
</LinearLayout>
Or just add each FrameLayout programatically via the LinearLayout's addView() with a unique ID for each FrameLayout.
LinearLayout layout = (LinearLayout)findViewById(R.id.linear);
FragmentTxn txn = getFragmentManager.beginTransaction();
int i = 1; // This seems really fragile though
for (Fragment f : fragments) {
FrameLayout frame = new FrameLayout(this);
frame.setId(i);
layout.addView(frame);
txn.add(i, f);
i++;
}
txn.commit();
Or the other way would be to just use a listView and add each row that way. Not using Fragments at all.
<TextView
android:id="#+id/string_theme"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/string_theme"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#cde21c" />
<ListView android:id="#+id/listview"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
then later on do something like this:
ListView view = (ListView)findViewById(R.id.listview);
view.setAdapter(new ArrayAdapter(items) { // items is a collection of objects you are representing
public View getView(int position, View view, ViewGroup parent) {
view = LayoutInflator.from(parent.getContext()).inflate(R.layout.theme_row_layout, parent, false);
// manipulate the view
return view;
});

You are creating a instance of ThemeRowFragment n number of times. The problem is you are creating this as an fragment and trying to add it dynamically. Since you instantiate the same Fragment i suggest you to use ListView and use a custom adapter and set CustomView and override the getView method of your adapter to adjust your views

Fragment and android:text:"#string/..."

Basically, I'm using Fragment in my project and all works fine
But I found that I can't return the strings from the value folder to the android:text
Example :
android:text="Hello World" << this works fine in Fragment , return Hello World in my TextView
android:text="#string/text1" << this doesn't work in Fragment ! it return #string/text1 in my TextView as it is
Can someone tell me a solution for this problem ?
my xml layout
<?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"
android:orientation="vertical"
android:background="#fa6a6a" >
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/text1"
android:textSize="20dp"
android:layout_centerInParent="true"
/>
</RelativeLayout>
main
public class AboutMe extends Fragment {
#Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_aboutme, container, false);
setHasOptionsMenu(true);
return rootView;
}

You need to access it by:
getActivity().getResources().getString(R.string.text1);