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Place 2+ Textfields side-by-side in a LinearLayout (horizontal) programmatically

i know, there are a lot of questions like this. I read a lot on stackoverflow and google about this topic, but nothing help me :(
Ok, here is the problem. I have a small app. In this app i have a fragment. The layout.xml for this fragment includes a placeholder linearlayout like the following
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="#+id/placeholderLinLayout">
</LinearLayout>
The fragment has a button. If u click on it a DialogFragmentPopup opens and u can enter some data-stuff. After you enter the data you can click on another button on this dialog and the data will be transfere to the main-fragment. Here i call a method which should generate programmatically a layout to present the data. I use the following code
myRoot = (LinearLayout) view.findViewById(R.id.placeholderLinLayout);
innerLayout = new LinearLayout(view.getContext());
innerLayout.setOrientation(LinearLayout.VERTICAL);
innerLayout.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
LinearLayout productHeaderLayout = new LinearLayout(getContext());
productHeaderLayout.setOrientation(LinearLayout.HORIZONTAL);
productHeaderLayout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
TextView product_header = new TextView(getContext());
product_header.setText("Produkt");
product_header.setLayoutParams(layoutParams);
TextView amount_header = new TextView(getContext());
amount_header.setText("Menge");
amount_header.setWidth(ViewGroup.LayoutParams.MATCH_PARENT);
amount_header.setLayoutParams(layoutParams);
TextView packaging_header = new TextView(getContext());
packaging_header.setText("Verpackung");
packaging_header.setWidth(ViewGroup.LayoutParams.MATCH_PARENT);
packaging_header.setLayoutParams(layoutParams);
TextView price_header = new TextView(getContext());
price_header.setText("Preis");
price_header.setWidth(ViewGroup.LayoutParams.MATCH_PARENT);
price_header.setLayoutParams(layoutParams);
TextView payment_header = new TextView(getContext());
payment_header.setText("Zahlart");
payment_header.setWidth(ViewGroup.LayoutParams.MATCH_PARENT);
payment_header.setLayoutParams(layoutParams);
productHeaderLayout.addView(product_header);
productHeaderLayout.addView(amount_header);
productHeaderLayout.addView(packaging_header);
productHeaderLayout.addView(price_header);
productHeaderLayout.addView(payment_header);
innerLayout.addView(productHeaderLayout);
The problem is, that the first textview push all other textviews out of the visible space, see the screenshot
What i want to do is, that these 5 textviews spread out automatically to the existing width. I googled a lot and the code i post here is the result of which i found many times on the internet.
So i hope someone can help find out the problem in my code :)
Greetings

Set all your TextView layout paramters to this:
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, 1f);
And remove .setWidth(ViewGroup.LayoutParams.MATCH_PARENT); from all the TextViews.
This will guarantee that all the views will have same weight set to them, and that weight gives all the views in LinearLayout same Width (or Height if orientation is set to vertical).

The issue is that your setting the TextView to MATCH_PARENT in its width. So one TextView takes the whole screen and the other starts just out of it. To solve this set the layoutparam width to WRAP_CONTENT.
Better yet, if you want to spread it, you can use the LinearLayout's weight property so they take as much space as they can:
textview.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT, 1f));
The third parameter 1f is the weight. A weight of one means it'll take all the available space without intruding on the other children, hence they will all spread evenly.

If you want to have your TextViews side by side, you must set the orientation of the LinearLayout to horizontal instead of vertical

Android Set ImageView in front of Relative Layout

I have a RelativeLayout in my Android App. Now I want to show an ImageView in front of that Layout. The problem is that the ImageView is not in the front, it's a bit transparent and I can see things like EditText and Button. I can't change the Layout (setContentView), because the Layout is created dynamically and after setContentView, the Controls are away.

You can add view programmatically, and in the way that it will be on the top!
create id for you top level layout
Now some code (in my case it's relative layout):
RelativeLayout relativeLayout = (RelativeLayout)findViewById(R.id.relative_layout_id);
ImageView imageView = new ImageView(context)
Drawable rightArrowBlackDrawable = getResources().getDrawable(R.drawable.image);
imageView.setLayoutParams(getLayoutParams());
relativeLayout.addView(imageView);
imageView.bringToFront();
//here just example layout params, use yours params ;-)
private RelativeLayout.LayoutParams getLayoutParams() {
RelativeLayout.LayoutParams layoutParams =
new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
layoutParams.addRule(RelativeLayout.CENTER_VERTICAL);
return layoutParams;
}

You can bring it to the front once you insert it.
imageView.bringToFront();
If the image is transparent, you can set a white background to prevent things below it from showing.
imageView.setBackgroundColor(0xFFFFFF);

ImageView manipulation in Java

I have an ImageView created in my xml layout. I then access the ImageView in my Java with the following:
ImageView iv1 = (ImageView) findViewById(R.id.iv1);
I'm then accessing the ImageView's OnClick method. When the ImageView is clicked I would like to change it's position on the screen. In the XML side I can do this with layout_margin, but I can't figure out how that is done in the Java side.
Could anyone point me in the right direction? Thanks in advance!

You can set margins programmatically using LayoutParams, please try with following code:
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(30, 20, 30, 0);
and set this layout param object to your view by using:
view.setLayoutParams(layoutParams);

i think you should change layout parameters by setLayoutParamerter method of View class see Discription.
this is not the big task, even you can add this view at any particular place by using Relative layout.

Android FrameLayout and TextView - why does LayoutParams work where setGravity() does not?

I'm using a FrameLayout to display (on demand) some text on the screen. I want the text to be in a certain place, so I thought setGravity() would do the job... but no, it seems to have no effect whatsoever on where the text goes (and other objects like ImageView don't even have this method).
So first, what exactly is TextView.setGravity() used for? (Edit: I understand this much better now, thanks! Still not clear on the following part of the question though.)
Second, it seems the only way to update a FrameLayout in this way is to create a new FrameLayout.LayoutParams object with the settings you want, and then use the setLayoutParams() method to apply it. (This seems to automatically update the view so is a requestLayout() call necessary?) And is there a simpler / more straightforward way to achieve this for a FrameLayout... say, without creating a new LayoutParams object as I'm doing now?
Thanks! For reference, below is a (working) code snippet showing how I'm setting up this FrameLayout and TextView.
FrameLayout fl1 = new FrameLayout(this);
FrameLayout.LayoutParams flp1 = new FrameLayout.LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
fl1.setId(9001);
fl1.setLayoutParams(flp1);
.....
tv1 = new TextView(this);
FrameLayout.LayoutParams tvp1 = new FrameLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT,
(Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM));
tv1.setId(9006);
tv1.setLayoutParams(tvp1); // This works
tv1.setBackgroundColor(Color.GRAY);
tv1.setTextColor(Color.BLACK);
tv1.setText("Dynamic layouts ftw!");
tv1.setGravity(Gravity.CENTER); // This does NOT work
.....
fl1.addView(tv1);

1) view.setGravity means hows the view should positions if children.
In the case of the textview it refers to the positioning of the text.
When in linearlayouts or viewgroups it refers to its child views.
2) I checked your code. You are already using textview.setGravity method. In that case you dont need to specify gravity parameters in the FrameLayout.LayoutParams constructor.
Other thing I noticed is that you gave the textview the width and height as wrap content which will only take the size of the text. So there is no meaning in giving gravity as the textview has no extra area to position the text to the center. You need to give the width of the textview as fill_parent. That should make your gravity property work.
Btw this is a very good article about Gravities. It explains both about gravity and the layout_gravity attribute.
If you want your textview to wrap the content then you should add your textview to a linearlayout and setgravity to the linear layout.
This should give what your are trying to do
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT);
FrameLayout fr = new FrameLayout(this);
fr.setLayoutParams(lp);
fr.setBackgroundColor(Color.RED);
LinearLayout.LayoutParams lp2 = new LinearLayout.LayoutParams(
LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT);
LinearLayout l = new LinearLayout(this);
l.setLayoutParams(lp2);
l.setGravity(Gravity.CENTER);
l.setBackgroundColor(Color.BLUE);
ViewGroup.LayoutParams vp = new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
TextView t = new TextView(this);
t.setLayoutParams(vp);
t.setText("Blessan Mathew");
t.setBackgroundColor(Color.CYAN);
l.addView(t);
fr.addView(l);

tv1.setGravity(Gravity.CENTER);
belongs to the gravity of the TEXT inside the TextView.
As documentation states:
Sets the horizontal alignment of the text and the vertical gravity
that will be used when there is extra space in the TextView beyond
what is required for the text itself.

dynamically adding a view to activity layout

I have a custom view (an extension of a TextView) that I want to dynamically add to my Layout (don't want to include it in the main.xml file).
The book says to fetch the RelativeLayout using findViewById() in my java code then create a new instance of my custom view, then use addView on the RelativeLayout to add the new view.
I'm not getting any errors, but when I click my button to add the new view, nothing is happening (view isn't being added). Do I need to set additional properties on my custom view (layout width, layout height for example) in order for it to be shown?
EDIT: adding code
// changed to an imageview as I thought it might be easier to see an image
RelativeLayout rel = (RelativeLayout) findViewById(R.id.rellay);
MyCustomImageView mciv = new MyCustomImageView(null);
mciv.setId(5);
LayoutParams p = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
mciv.setLayoutParams(p);
mciv.setImageResource(R.drawable.someImage);
rel.Addview(mciv);

Please post your code where you add the view.
But yes, you might be missing the params for width and height. Try something like
LayoutParams p = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.FILL_PARENT);
txtView.setLayoutParams(p);
or what you would like the width and height to be. Also in xml layout, layout_width and layout_height are required attributes.