Develop Reference

Set gravity of dynamic textview

I have created a text view dynamically.I want to set its gravity to right.I have used textview.setGravity(Gravity.RIGHT) but its not working.When I am using it the text view is aligned to left direction only.How can I set the gravity of textview?I dont want to use setPadding().
textMore[i]=new TextView(this);
textMore[i].setGravity(Gravity.Right);
textMore[i].setText("more....");
textMore[i] .setTextColor(Color.BLUE);

you can't change alignment of TextView by setGravity , it changes the TextView contents alignment.

You can do
LinearLayout.LayoutParams textParams = (LinearLayout.LayoutParams) textMore[i].getLayoutParams();
textParams.gravity = Gravity.RIGHT;
textMore[i].setLayoutParams(textParams);
and then add the view in your dynamic LinearLayout

If the parent of your text view is RelativeLayout(Prefer this)
set : alignParentRight
If the parent of your text view is LinearLayout
set : setLayoutGravity(Gravity.Right)
or
LinearLayout.LayoutParams textParams = (LinearLayout.LayoutParams)textMore[i].getLayoutParams();
textParams.gravity = Gravity.RIGHT;
textMore[i].setLayoutParams(textParams);
setGravity(Gravity.Right) ==> This property will align the text inside your textView, rather than aligning the view in its parent.

Firstly set your textView Width property to fill parent then you can set it gravity to right
if you are using linear layout

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);

Remove marginetop a relative layout dynamically if another layout is generated in between two relative layout

I have two relative layout say relative layout1 & 2 having an edit text and a button. In order to provide spacing in between I specified margin top of 30dp to relative layout2. Another relative layout 3 is generated dynamically in between them when we click button of the relative layout1. If so I have to remove margin top of relative layout2 programatically.
snapshot is like below
In this case a provide padding in xml. But when another layout is added in between like this
the padding is not preferable. I have to remove padding programmatically. How can i do that by checking whether there is a layout in between and remove that padding. I am a beginner in android coding....

You can set margins, or anything else regarding a layout like this:
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams)relativeLayout.getLayoutParams();
layoutParams.setMargins(80, 0, 0, 0); // left, top, right, bottom
relativeLayout.setLayoutParams(layoutParams);
You can find more Information on LayoutParams here:
http://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html

If you want to remove padding call
relativeLayout.setPadding(0,0,0,0);

Android Layout Background Dynamically

I have a relative layout:
RelativeLayout ll = new RelativeLayout(this);
How can I set a background to the layout (dynamically not in xml) and have it stretch to fill the entire screen?
Thanks

Try
ll.setBackgroundResource(R.drawable.background);
Look here for methods you need.

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.