Develop Reference

Add editText to fragment

I'm trying to add editText and textView to a fragment. The code to generate the editText and TExtView is correct because I've used it before, but in this case nothing appears. Any ideas?
Fragment code:
public class MarcadoresFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View myFragmentView = inflater.inflate(R.layout.fragment_marcadores, container, false);
return myFragmentView;
}
}
Add the editText:
public void createEditText(int size){
Log.d("det", String.valueOf(size));
LayoutInflater inflater = this.getLayoutInflater();
View dialogView = inflater.inflate(R.layout.fragment_marcadores, null);
LinearLayout layout = (LinearLayout) dialogView.findViewById(R.id.marcadoresFrag); // this is whatever view you want to add them to
EditText editText;
TextView textView;
if(layout!=null)
for(int i=0;i<size;i++){
textView = new TextView(dialogView.getContext());
textView.setText("Descrição do marcador " + String.valueOf(i + 1));
textView.layout(0, 5, 0, 5);
// add to the view
layout.addView(textView);
editText = new EditText(dialogView.getContext());
editText.setId(i);
editText.setHint("Ex: Bebedouro ndsfhjdsjvdsbjvjhvjdfjbvfjfvjklbjklfv" + i + 1);
Log.d("det", "jsdgbiusdbgksjd");
allEds.add(editText);
// add to the view
layout.addView(editText);
}
}

Button array in Fragment

I am new to Android Programming. I want to add an array of buttons fragment layout dynamically.
Activity:
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_list_dir,
container, false);
LinearLayout linearLayout=new LinearLayout(getActivity());
LayoutParams param=new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
linearLayout.setLayoutParams(param);
linearLayout.setOrientation(LinearLayout.VERTICAL);
LayoutParams param2=new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
Button dirButton[]=new Button[5];
for(int i=0;i<5;i++)
{
dirButton[i].setLayoutParams(param2);
linearLayout.addView(dirButton[i]);
}
ViewGroup vg=(ViewGroup)rootView;
vg.addView(linearLayout);
return rootView;
}
}
But this is causing Null pointer exception. But if only one button is used then it works like:
Button dirButton=new Button(getActivity());
Is there way to achieve the button array?

Arrays don't work like that. Try something like this:
Button[] buttonArray = new Button[5];
for(int i = 0; i < 5; i++)
{
buttonArray[i] = new Button(getActivity());
buttonArray[i].setLayoutParams(params);
linearLayout.addView(buttonArray[i]);
}

public static class PlaceholderFragment extends Fragment {
private static final String LOG_TAG = PlaceholderFragment.class.getSimpleName();
public PlaceholderFragment() { }
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_my, container, false);
LinearLayout linearLayout = new LinearLayout(getActivity());
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT);
linearLayout.setLayoutParams(param);
linearLayout.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams param2 = new LinearLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
Button dirButton[] = new Button[5];
for(int i = 0; i < 5; i++) {
dirButton[i] = new Button(getActivity());
dirButton[i].setLayoutParams(param2);
linearLayout.addView(dirButton[i]);
}
ViewGroup vg = (ViewGroup) rootView;
vg.addView(linearLayout);
return rootView;
}
}
When you have an array of objects, the default value is null . You forgot to actually create the Button. Here is the part you needed to change :
dirButton[i] = new Button(getActivity());
dirButton[i].setLayoutParams(param2);

NullPointerException while adding view in a fragment dynamically

I am trying to dynamically add a TableLayout into a LinearLayout inside a fragment.
Code below:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState){
View rootview = inflater.inflate(R.layout.dashboard_fragment, container, false);
dash_board = (LinearLayout) rootview.findViewById(R.layout.dashboard_fragment);
table = new TableLayout(getActivity());
TableRow tr_header = new TableRow(getActivity());
TextView Name = new TextView(getActivity());
Name.setText("Name");
LayoutParams Name_params = new LayoutParams();
Name_params.width= 100;
Name.setLayoutParams(Name_params);
Name.setPadding(2, 0, 2, 2);
tr_header.addView(Name);
TextView Points = new TextView(getActivity());
Points.setText("Points");
LayoutParams point_params = new LayoutParams();
point_params.width= 100;
Points.setLayoutParams(point_params);
Points.setPadding(2, 0, 2, 2);
tr_header.addView(Points);
table.addView(tr_header);
dash_board.addView(table);
return rootview;
}
But while adding table to the dash board layout (dash_board.addView(table);) I am getting a NullPointerException.
What could the issue be?

Actually there is no dashboard_fragment as a ViewGroup in rootView because the rootView is exacly the dashboard_fragment as a ViewGroup.So these two lines of code are the cause of exception:
View rootview =
inflater.inflate(R.layout.dashboard_fragment,container, false);
dash_board =
(LinearLayout)rootview.findViewById(R.layout.dashboard_fragment);
Actually the logic will be correct if you do like this:
View rootview =
inflater.inflate(R.layout.dashboard_fragment,container, false);
dash_board =
(LinearLayout) rootView;
And this is the simplest form for this process:
dash_board
=(LinearLayout)inflater.inflate(R.layout.dashboard_fragment,container, false);

Instead of this
View rootview = inflater.inflate(R.layout.dashboard_fragment, container, false);
dash_board = (LinearLayout) rootview.findViewById(R.layout.dashboard_fragment);
it should be
LinearLayout dash_board = (LinearLayout)inflater.inflate(R.layout.dashboard_fragment, container, false);

setting the background colour from program rather than from xml for fragments

I need some help in setting the background colour using code for my current fragment. The fragment is created on selecting a particular tab.
Below is my main activity code
public class TabActionBarActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Set the text and background colour
setTheme(R.style.MyTheme);
ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
String label6 = getResources().getString(R.string.label6);
tab = actionBar.newTab();
tab.setText(label6);
TabListener<Tab6Fragment> tl6 = new TabListener<Tab6Fragment>(this,
label6, Tab6Fragment.class);
tab.setTabListener(tl6);
actionBar.addTab(tab);
String label7 = getResources().getString(R.string.label7);
tab = actionBar.newTab();
tab.setText(label7);
TabListener<Tab7Fragment> tl7 = new TabListener<Tab7Fragment>(this,
label7, Tab7Fragment.class);
tab.setTabListener(tl7);
actionBar.addTab(tab);
}
Now the code for the Tab7Fragment class looks like this
public class Tab7Fragment extends Fragment {
TextView tv1;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
ScrollView sv = new ScrollView(this.getActivity());
LinearLayout ll = new LinearLayout(this.getActivity());
ll.setOrientation(LinearLayout.VERTICAL);
sv.addView(ll);
TextView tv = new TextView(this.getActivity());
tv.setText("Dynamic layouts ftw!");
ll.addView(tv);
EditText et = new EditText(this.getActivity());
et.setText("weeeeeeeeeee~!");
ll.addView(et);
Button b = new Button(this.getActivity());
b.setText("I don't do anything, but I was added dynamically. :)");
ll.addView(b);
for(int i = 0; i < 20; i++) {
CheckBox cb = new CheckBox(this.getActivity());
cb.setText("I'm dynamic!");
ll.addView(cb);
}
return this.getView();
}
}
Now how can i set the view for this fragment?
this.getActivity().setContentView(sv);
I know the above method is incorrect. But i need to set the content view with the scrollview layout. and another question is how do i set the background colour for this view?(using setBackgroundColor()?

Try this code in your onCreateView():
View view = inflater.inflate(R.layout.your_fragment_layout, container, false);
Then dont forget to return the view that you just inflated to the android runtime.
Remove return this.getView(); and add return view;

To set background color :
sv.setBackgroundColor(getRessources().getColors(R.color.yourcolor));
To inflate layout into a fragment, you need to return a View from onCreateView :
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.your layout, container, false);
}

How can I change the fragment in running?

Hy, I have this code in my Fragment:
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fr_menu,container,false);
final ViewGroup dismissableContainer = (ViewGroup)view.findViewById(R.id.dismissable_container);
for (int i = 0; i < 3; i++) {
final Button dismissableButton = new Button(getActivity());
dismissableButton.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
dismissableButton.setText("Button " + (i + 1));
dismissableContainer.addView(dismissableButton);
}
return view;
}
in the same fragment I have a method that receives an object from the outside
public void sendObject(MyObject t){
Button b=new Button(getActivity());
b.setText(t.getNum_tav());
// Now I want to put **b** under button1 button2 and button3
}
in the method sendobject ... How can I change the fragment?
I have to put the button with the other 3 button

Just add it to the same ViewGroup, assuming it's a vertical LinearLayout:
getView().findViewById(R.id.dismissable_container).addView(b);
If it's not, then you'll have to work out the layout to prepare a suitable position for it, but it should be conceptually similar.