Develop Reference

How to set position of view while using addView

I'm adding multiple Views by code into Layout. I need each new View to be above previous one(top of the parent layout).
EDIT: To be more accurate I'll describe what the app module should does. User start with clean screen and one button at the bottom of the screen. The button adds a View at the top of the screen. Next clicks should add next views above previous ones to make the newest View be on the top of a container. The app saves state and on restart user see views in the same order.

Call the following method from Button's onClick Event.
private final int LAYOUT_TOP_INDEX = 0;
private void addViewOnTop(View view){
if(layout != null && view !=null)
layout.addView(view, LAYOUT_TOP_INDEX);
}
where 'layout' is your Layout (e.g., LinearLayout) to which the View is to be added.

Would really need more information from you to give a more accurate answer, but if you're saying what i think you are then you can just add these views to a LinearLayout with orientation set to vertical.
And assuming you're iterating through a list to dynamically add views, instead of incrementing from 0, increment down from the size of the list.
for(int i = size; i >= 0; i--){
linearLayout.add(new TextView(Context));
}

View positions inside ViewGroups are defined by the LayoutParams
How does this happen? Views pass their LayoutParams to their parent ViewGroups
//100% programatic approach with simple LayoutParams
LinearLayout myLinearLayout = new LinearLayout(this);
//if the **parent** of the new linear layout is a FrameLayout
FrameLayout.LayoutParams layoutParams =
new FrameLayout.LayoutParams(
FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT);
//or if you have the XML file you don't have to worry about this
//myLinearLayout = (LinearLayout)findViewById(R.id.my_simple_linear_layout);
//you could have a LinkedList<TextView>
LinkedList<TextView> textViewList = new LinkedList<>();
//assuming the order is the correct order to be displayed
Iterator<TextView> descendingIterator = textViewList.descendingIterator();
while(descendingIterator.hasNext())
{
//just add each TextView programatically to the ViewGroup
TextView tView = descendingIterator.next();
myLinearLayout.addView(tView);
}
Just like we defined LayoutParams for the LinearLayout we could also define LayoutParams for the TextView
IMPORTANT: when setting LayoutParams you need to be sure they fit the VIEWGROUP, that is the parent of the View being added
private TextView textViewFactory(String myText) {
TextView tView = new TextView(getBaseContext());
//controling the position relatively to the PARENT
//because you are adding the textview to a LINEAR LAYOUT
LinearLayout.LayoutParams paramsExample =
new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT, 1.0f);
tView.setLayoutParams(paramsExample);
//configuring the insides of the textview
//you can also do all kinds of stuff programatically
tView.setGravity(Gravity.CENTER_HORIZONTAL);
tView.setPadding(10, 10, 10, 10);
tView.setTypeface(Typeface.DEFAULT_BOLD);// (null, Typeface.BOLD_ITALIC);
tView.setTypeface(Typeface.SANS_SERIF);
tView.setTypeface(null, Typeface.ITALIC);
tView.setTypeface(Typeface.defaultFromStyle(R.style.AppTheme));
tView.setId(R.id.aux_info);
tView.setText(myText);
//.........all kinds of stuff really
return tView;
}

If you mean adding a view programmatically so that the new one is added above the previous one, instead of below it, then I suggest this:
Maintain an ArrayList with the items you want to turn into views
Put them into a ListView
When you want to add a new view that must appear at the top of the list, insert it as the first element of your ArrayList and recreate the ListView from it.

cannot add view to nested linear layout in fragment

I want to build whole fragment layout programatically and dynamically. So I've created this code:
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.empty_container, container, false);
final FrameLayout rootView = (FrameLayout) view.findViewById(R.id.empty_container);
final LinearLayout linearLayout = new LinearLayout(getActivity());
linearLayout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
linearLayout.setOrientation(LinearLayout.HORIZONTAL);
linearLayout.setBackgroundColor(Color.BLACK);
rootView.addView(linearLayout);
final Button button = new Button(getActivity());
button.setBackgroundColor(Color.GREEN);
button.setText("button name");
button.setLayoutParams(new LinearLayout.LayoutParams(100, 100));
linearLayout.addView(button);
return view;
}
and the xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
android:id="#+id/empty_container"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
I cant figure out why this is not working properly. Button is not visible at all (but linear layout is visible - whole screen is black). When I set one of button Layout params to MATCH_PARENT it suddenly appears, but when I set it to 100 px or WRAP_CONTENT its not showing.

It looks like you are adding it.
Open Android Device Monitor, run the app, then check your DOM with the tree viewer. You will be able to see if Views are being added to your DOM.
developer.android.com/tools/help/hierarchy-viewer.html

Why don't you just make the root view a LinearLayout? Then you can just cast the root view to a LinearLayout, you don't need to find it by id because you already have reference to it. Also not sure what you intend by this line linearLayout.setGravity(LinearLayout.HORIZONTAL); Check this link for valid values to put into setGravity http://developer.android.com/reference/android/view/Gravity.html

The button was hiding under the toolbar, and size 100px x 100px was not enough to display it. Hierarchy viewer helped me figure this out it.

add dynamic relative layout below another relative layout which is in xml

I have some relative layouts in my xml file. I want to add relative layout dynamically on click of add button below last relative layout added in my xml. I have searched n find some articles on stack overflow about it but everyone has added the layout below some dynamic view.I want to add dynamic relative layout below my static relative layout.
Code-
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
//get id of relative layout which is in xml
rlOption4=(RelativeLayout)view.findViewById(R.id.rlOption4);
}
if(v.getId()==R.id.imageButtonAdd)
{
Log.e("onclick","add");
// Creating a new RelativeLayout
RelativeLayout relativeLayout = new RelativeLayout(getActivity());
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.BELOW,rlOption4.getId());
relativeLayout.setLayoutParams(lp);
EditText optNew=new EditText(getActivity());
optNew.setText("Option 5");
relativeLayout.addView(optNew);
}

If you change the line :
relativeLayout.addView(optNew);
to
rlOption4.addView(optNew);
then optNew will be appended as a child of rlOption4 in your layout.

How to dynamically wrap root layout in a ScrollView

I want to add a scroll view to all the layouts that I have. But dynamically. Because the app will run in different screen sizes, and when I will get a screen size smaller than a specific size, then I want to show the layout in a scroll view.
So I made this method, it will be called on the check that the screen is small. I will pass my activity and I want to change the root layout to scroll view or just add a ScrollView as the root layout. So if the root layout is a LinearLayout, then I want to put that layout in the ScrollView. And I have not named all the layouts, meaning that I didn't give an ID to the layout, so I cannot use findViewById.
public static void SetActivityRoot(Activity c) {
View v = c.getWindow().getDecorView();
// View v = v.getRootView();
ScrollView sv = new ScrollView(c);
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT);
sv.setLayoutParams(lp);
((ViewGroup)v.getParent()).removeView(v);
sv.addView((View) v);
((ViewGroup)v.getParent()).addView(sv);
}
It's giving me an error saying that "you cannot remove view from null" etc. Or that "you cannot add view to layout as it already has parent view". How can I make this work?

Finally solved my problem.
public static void SetActivityRoot(Activity c) {
View v = ((ViewGroup)c.findViewById(android.R.id.content)).getChildAt(0);
ScrollView sv = new ScrollView(c);
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT);
sv.setLayoutParams(lp);
((ViewGroup) v.getParent()).removeAllViews();
sv.addView((View) v);
c.addContentView(sv, lp);
}

How to add View dynamically from right side in Android?

I need to layout the views from the RIGHT side in a Fragment in Android, however, android did not layout the sub views as what I thought.
I tried to add a TableLayout and an ImageView to a LINEARLAYOUT, the width of the ImageView was fixed and the width of TableLayout is dynamic. Furthermore, the ImageView need to be located on the right side.
Part of the source code:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
Context c = getActivity().getApplicationContext();
LinearLayout l = new LinearLayout(c);
LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT, 0);
params.gravity = Gravity.RIGHT;
l.setLayoutParams(params);
// l.setGravity(Gravity.RIGHT);
PankouAttachmentView pav = new PankouAttachmentView(c, null);
pav.setLayoutParams(params);
l.addView(pav);
ImageView iv = new ImageView(c);
iv.setClickable(true);
iv.setFocusable(true);
iv.setImageResource(R.drawable.testarrow);
iv.setMaxWidth(BUTTON_WIDTH);
iv.setLayoutParams(new LayoutParams(BUTTON_WIDTH,
LayoutParams.MATCH_PARENT));
l.addView(iv);
return l;
}
Any help will be appreciated.THX :)

I'm not sure I completely understand your question but have you tried using a relative layout? Relative layout lets you accomplish much easier than a linear layout. See the android hello views tutorial.