We Keep Coding

LayoutParams.MATCH_PARENT does not work but integer does

I am generating editTexts in a TableRow and the editTexts width is wrapping the content by default. I tried to set their width to match_parent like this:
TableRow tr = new TableRow(getActivity());
EditText et = new EditText(getActivity());
LayoutParams lparams = new TableRow.LayoutParams(
LayoutParams.MATCH_PARENT,
LayoutParams.WRAP_CONTENT);
et.setLayoutParams(lparams);
It did not change anything, but i can set their width if i replace LayoutParams.MATCH_PARENT with an integer. Could you please point me in the right direction to see why i cannot set their width to MATCH_PARENT?

I accidentally found out, that if i am not using a TableRow, but placing the editTexts into the TableLayout its width will automaticall match the parent's width.

Programatically setting constraints is leading to views overlapping

I'm trying to write some code to display two views within a constraint layout. I have used the following code so that the first view should appear on the left of the screen, and the second on the right.
ConstraintSet set = new ConstraintSet();
set.clone(cl);
set.connect(tv.getId(), ConstraintSet.LEFT, ConstraintSet.PARENT_ID, ConstraintSet.LEFT, 0);
set.connect(img.getId(), ConstraintSet.RIGHT, ConstraintSet.PARENT_ID, ConstraintSet.RIGHT, 0);
set.applyTo(cl);
However when I run my app the two views just appear in the centre overlapping each other.
The code for my two views is:
ConstraintLayout.LayoutParams params3 = new
ConstraintLayout.LayoutParams(
ConstraintLayout.LayoutParams.WRAP_CONTENT,
ConstraintLayout.LayoutParams.WRAP_CONTENT
);
params3.setMargins(8,8,8,8);
ConstraintLayout.LayoutParams params4 = new
ConstraintLayout.LayoutParams(
ConstraintLayout.LayoutParams.WRAP_CONTENT,
ConstraintLayout.LayoutParams.WRAP_CONTENT
);
params4.setMargins(5,5,5,5);
LinearLayout.LayoutParams params5 = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT
);
TextView tv = new TextView(mContext);
tv.setText(LeagueName);
tv.setTextSize(18);
tv.setLayoutParams(params3);
ImageView img = new ImageView(mContext);
img.setImageResource(R.mipmap.basketball);
img.setLayoutParams(params4);
cl.addView(tv);
cl.addView(img);
card.addView(cl);
mLayout.addView(card);
I'm new to android so I've almost certainly missed something fundamental.
Thanks

So after a lot of playing around I've discovered that getId() returns the same default value for each element and so each time I added a new constraint I was applying it to every view. The way around this is to use setId() every time you create a new view in order to ensure they remain unique.

Set text colour of android.widget.SearchView

I am adding a android.widget.SearchView to a view in code but I cannot find how to set the text colour for this.
SearchView = new SearchView(getContext());
I see that there are methods to set the text alignment and direction.
I also see that I can set the background colour and tint but nothing for the foreground.

Try This
int id = searchView.getContext().getResources().getIdentifier("android:id/search_src_text", null,
null);
TextView textView = (TextView) searchView.findViewById(id);
textView.setTextColor(Color.WHITE);
Is it possible to change the textcolor on an Android SearchView?

setMargins() won't work - Android

I've been looking for solutions for this problem for more than one hour now, but none is working. :/
I want to set the top margin of my TextView to a value depending on the integer position.
But somehow the margins won't show up...
public void addElements(int position, String title,int colour, RelativeLayout ld){
int px = (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP,
1,
res.getDisplayMetrics()
);
int pos = 168*px;
LayoutParams params;
params = new LayoutParams(LayoutParams.MATCH_PARENT,144*px);
params.setMargins(0, 168, 0, 0);
TextView tv = new TextView(activity);
tv.requestLayout();
tv.setBackgroundResource(colour);
tv.setText(title);
tv.setSingleLine(false);
ld.addView(tv, params);
}

Try this:
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, 144);
params.setMargins(0, 168, 0, 0);

LayoutMargins are reserved for ViewGroup's such as RelativeLayout, LinearLayout, etc. Most common Views such as a TextView use padding in order to add additional spacing.
This should work:
tv.setPaddingRelative(0,168,0,0);

Android center view with SetMargins programmatically? [duplicate]

I want to add an unknown number of ImageView views to my layout with margin. In XML, I can use layout_margin like this:
<ImageView android:layout_margin="5dip" android:src="#drawable/image" />
There is ImageView.setPadding(), but no ImageView.setMargin(). I think it's along the lines of ImageView.setLayoutParams(LayoutParams), but not sure what to feed into that.
Does anyone know?

android.view.ViewGroup.MarginLayoutParams has a method setMargins(left, top, right, bottom). Direct subclasses are: FrameLayout.LayoutParams, LinearLayout.LayoutParams and RelativeLayout.LayoutParams.
Using e.g. LinearLayout:
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
lp.setMargins(left, top, right, bottom);
imageView.setLayoutParams(lp);
MarginLayoutParams
This sets the margins in pixels. To scale it use
context.getResources().getDisplayMetrics().density
DisplayMetrics

image = (ImageView) findViewById(R.id.imageID);
MarginLayoutParams marginParams = new MarginLayoutParams(image.getLayoutParams());
marginParams.setMargins(left_margin, top_margin, right_margin, bottom_margin);
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(marginParams);
image.setLayoutParams(layoutParams);

All the above examples will actually REPLACE any params already present for the View, which may not be desired. The below code will just extend the existing params, without replacing them:
ImageView myImage = (ImageView) findViewById(R.id.image_view);
MarginLayoutParams marginParams = (MarginLayoutParams) image.getLayoutParams();
marginParams.setMargins(left, top, right, bottom);

Kevin's code creates redundant MarginLayoutParams object. Simpler version:
ImageView image = (ImageView) findViewById(R.id.main_image);
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(image.getLayoutParams());
lp.setMargins(50, 100, 0, 0);
image.setLayoutParams(lp);

If you want to change imageview margin but leave all other margins intact.
Get MarginLayoutParameters of your image view in this case: myImageView
MarginLayoutParams marginParams = (MarginLayoutParams) myImageView.getLayoutParams();
Now just change the margin you want to change but leave the others as they are:
marginParams.setMargins(marginParams.leftMargin,
marginParams.topMargin,
150, //notice only changing right margin
marginParams.bottomMargin);

I use simply this and works great:
ImageView imageView = (ImageView) findViewById(R.id.image_id);
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) imageView.getLayoutParams();
layoutParams.setMargins(left, top, right, bottom);
imageView.setLayoutParams(layoutParams);
setMargins()'s unit is pixel not dp. If you want to set margin in dp, just inside your values/dimens.xml file create your dimensions like:
<resources>
<dimen name="right">16dp</dimen>
<dimen name="left">16dp</dimen>
</resources>
and access like:
getResources().getDimension(R.dimen.right);

If you use kotlin, this can be simplified by creating an extension function
fun View.setMarginExtensionFunction(left: Int, top: Int, right: Int, bottom: Int) {
val params = layoutParams as ViewGroup.MarginLayoutParams
params.setMargins(left, top, right, bottom)
layoutParams = params
}
Now all you need is a view, and this extension function can be used anywhere.
val imageView = findViewById(R.id.imageView)
imageView.setMarginExtensionFunction(0, 0, 0, 0)

You can use this method, in case you want to specify margins in dp:
private void addMarginsInDp(View view, int leftInDp, int topInDp, int rightInDp, int bottomInDp) {
DisplayMetrics dm = view.getResources().getDisplayMetrics();
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
lp.setMargins(convertDpToPx(leftInDp, dm), convertDpToPx(topInDp, dm), convertDpToPx(rightInDp, dm), convertDpToPx(bottomInDp, dm));
view.setLayoutParams(lp);
}
private int convertDpToPx(int dp, DisplayMetrics displayMetrics) {
float pixels = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, displayMetrics);
return Math.round(pixels);
}

Answer from 2020 year :
dependencies {
implementation "androidx.core:core-ktx:1.2.0"
}
and cal it simply in your code
view.updateLayoutParams<ViewGroup.MarginLayoutParams> {
setMargins(5)
}

create layout dynamically and set its parameter as setmargin() will not work directly on an imageView
ImageView im;
im = (ImageView) findViewById(R.id.your_image_in_XML_by_id);
RelativeLayout.LayoutParams layout = new RelativeLayout.LayoutParams(im.getLayoutParams());
layout.setMargins(counter*27, 0, 0, 0);//left,right,top,bottom
im.setLayoutParams(layout);
im.setImageResource(R.drawable.yourimage)

For me this worked:
int imgCarMarginRightPx = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, definedValueInDp, res.getDisplayMetrics());
MarginLayoutParams lp = (MarginLayoutParams) imgCar.getLayoutParams();
lp.setMargins(0,0,imgCarMarginRightPx,0);
imgCar.setLayoutParams(lp);

sample code is here ,its very easy
LayoutParams params1 = (LayoutParams)twoLetter.getLayoutParams();//twoletter-imageview
params1.height = 70;
params1.setMargins(0, 210, 0, 0);//top margin -210 here
twoLetter.setLayoutParams(params1);//setting layout params
twoLetter.setImageResource(R.drawable.oo);

In Kotlin you can write it in more pleasant way
myView.layoutParams = LinearLayout.LayoutParams(
RadioGroup.LayoutParams.MATCH_PARENT, RadioGroup.LayoutParams.WRAP_CONTENT
).apply {
setMargins(12, 12, 12, 12)
}

Using a method similar to this might save you some headaches in some situations.
If you have two passes of programmatical tinkering with margins it is safer to check if there are already some layoutParams set. If there are some margins already one should increase them and not replace them:
public void addMargins(View v, int left, int top, int right, int bottom) {
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) v.getLayoutParams();
if (params == null)
params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
int oldLeft = params.leftMargin;
int oldTop = params.topMargin;
int oldRight = params.rightMargin;
int oldBottom = params.bottomMargin;
params.setMargins(oldLeft + left, oldTop + top, oldRight + right, oldBottom + bottom);
v.setLayoutParams(params);
}

Here is an example to add 8px Margin on left, top, right, bottom.
ImageView imageView = new ImageView(getApplicationContext());
ViewGroup.MarginLayoutParams marginLayoutParams = new ViewGroup.MarginLayoutParams(
ViewGroup.MarginLayoutParams.MATCH_PARENT,
ViewGroup.MarginLayoutParams.WRAP_CONTENT
);
marginLayoutParams.setMargins(8, 8, 8, 8);
imageView.setLayoutParams(marginLayoutParams);

We can create Linear LayoutParams & use resources.getDimensionPixelSize for dp value.
val mContext = parent.context
val mImageView = AppCompatImageView(mContext)
mImageView.setBackgroundResource(R.drawable.payment_method_selector)
val height = mContext.resources.getDimensionPixelSize(R.dimen.payment_logo_height)
val width = mContext.resources.getDimensionPixelSize(R.dimen.payment_logo_width)
val padding = mContext.resources.getDimensionPixelSize(R.dimen.spacing_small_tiny)
val margin = mContext.resources.getDimensionPixelSize(R.dimen.spacing_small)
mImageView.layoutParams = LinearLayout.LayoutParams(width, height).apply {
setMargins(margin, margin, 0, 0)
}
mImageView.setPadding(padding, padding, padding, padding)