Develop Reference

Android margins not working when the view was added dynamically

I am adding some View to the LinearLayout dynamically:
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
params.setMargins(100, 100, 100, 100);
view.setLayoutParams(params);
parent.addView(view);
However, the margins are not getting applied. The following:
view.invalidate();
view.requestLayout();
parent.invalidate();
parent.requestLayout();
didn't work. However, if I force the activity to recreate (e.g. turn off and on my mobile phone), the margins get applied. Calling activity.recreate() also works, but it's too slow.
How to force layout to recalculate margins? Probably, there's something wrong in the flow? I tried to add my views to the root after creation, add children before and after applying properties, but this didn't work for me.
UPD:
I tried to repeat the bug programmatically and got it with this code:
LinearLayout base = new LinearLayout(context);
LayoutParams params1 = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
base.setLayoutParams(params1);
base.setBackgroundColor(Color.CYAN);
root.addView(base);
LinearLayout another1 = new LinearLayout(context);
LayoutParams params2 = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
another1.setLayoutParams(params2);
another1.setOrientation(LinearLayout.VERTICAL);
another1.setBackgroundColor(Color.BLUE);
base.addView(another1);
TextView tv1 = new TextView(context);
tv1.setText("SOME TEST TEXT 1");
tv1.setTextColor(Color.BLACK);
LayoutParams params4 = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
params4.setMargins(100, 100, 100, 100);
tv1.setLayoutParams(params4);
another1.addView(tv1);
TextView tv2 = new TextView(context);
tv2.setText("SOME TEST TEXT 2");
tv2.setTextColor(Color.BLACK);
LayoutParams params5 = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
params4.setMargins(100, 100, 100, 100);
tv2.setLayoutParams(params5);
another1.addView(tv2);
I expect margins to be applied, but they are not. What is the correct order of initializing such a view?

So, my trouble was in DP to PX converter that just wasn't initialized at that moment. However, to clarify everything, my example above is just an error (I didn't change params4 to params5 when adding the second TextView.
Also while testing everything, I found out that the order of adding layouts and their parameters doesn't matter at all.

You probably added child views to the parent view in onCreate().
In onCreate(), parent view does not have actual size.
If you have to do it in onCreate(), try following code.
final ViewTreeObserver observer = parent.getViewTreeObserver();
observer.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
LinearLayout.LayoutParams params = new
LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
params.setMargins(100, 100, 100, 100);
TextView view = new TextView(context);
view.setLayoutParams(params);
parent.addView(view);
observer.removeOnGlobalLayoutListener(this);
}
};
Hope this will help!

Try this:
LinearLayout ll = findViewById(R.id.linearLayout);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(30,20,30,0);
Hope this will help!

How to make the textview content HORIZONTAL

I need dynamic create the texview, it works just the text content show VERTICAL but HORIZONTAL
TextView tv = new TextView(this.theContext);
tv.setText(this.getTip(0));
tv.setBackgroundColor(Color.BLUE);
tv.setGravity(Gravity.CENTER_HORIZONTAL);
tv.setLayoutDirection(View.LAYOUT_DIRECTION_LTR);
LinearLayout.LayoutParams params =
new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
params.setMargins(0, 0, 0, 0);
params.gravity = Gravity.CENTER;
this.addView(tv, params);
mLeftLabel = tv;
also, I set the layout :
tv.layout(l,t,r,b); . but I think that this statement should not effect the text Direction, is it right ?
please give help or tip, thanks.

try to follow the example below:
TextView tv = new TextView(this);
tv.setText("text");
LinearLayout.LayoutParams params =
new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
params.setMargins(0, 0, 0, 0);
params.gravity = Gravity.CENTER;
mainLayout.addView(tv, params);

try changing LayoutParams as
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
setting gravity to center when you are using WRAP_CONTENT for textview does not seem to make sense, though I am not sure.

SetMargin Not Working in RelativeLayout

drawer.xml; have RelativeLayout id:relative.
I want to show another relative layout on the drawerlayout;
RelativeLayout drawer = (RelativeLayout) getApplicationContext().findViewById(R.id.drawerrelative);
RelativeLayout view = (RelativeLayout) getLayoutInflater().inflate(R.id.relative, (ViewGroup) findViewById(R.id.relative));
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.CENTER_IN_PARENT);
drawer.addView(view, params);
I show relative layout(id:relative) on main layout(id:drawerrelative) and CENTER on screen.Everythings normally but when i set margin ;
params.setMargins(0, 100, 0, 0);
not working. I was add view.requestLayout() but not working..
How i can solve this problem? (Thank you and sory for my bad english)

Try this code block
LinearLayout.LayoutParams relativeParams = new LinearLayout.LayoutParams(
new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
relativeParams.setMargins(0, 100, 0, 0);
relativeLayout.setLayoutParams(view);
relativeLayout.requestLayout();

layout margin for text view programmatically

If I use xml file I have a option called layout_margin (for example layout_margin ="1dp" for text view ) but I want to set programmatically and I dont know how to do it.

LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)textview.getLayoutParams();
params.setMargins(20, 0, 0, 0);
textview.setLayoutParams(params);

Please Google before adding your question to StackOverflow.
TextView tv = (TextView)findViewById(R.id.my_text_view);
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)tv.getLayoutParams();
params.setMargins(0, 0, 10, 0); //substitute parameters for left, top, right, bottom
tv.setLayoutParams(params);

Note, that not all LayoutParams has method setMargins();
RelativeLayout, LinearLayout etc has their own inner class LayoutParams, so availability of setMargins is not always available.

You can do by this:
TextView text = (TextView) findViewById(R.id.text);
LinearLayout.LayoutParams params= new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
params.setMargins(left, top, right, bottom);//pass int values for left,top,right,bottom
text.setLayoutParams(params);

TextView tv = (TextView) findViewById(R.id.tvId);
LinearLayout.LayoutParams llp = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
llp.setMargins(50, 0, 0, 0); // llp.setMargins(left, top, right, bottom);
tv.setLayoutParams(llp);

Try This: It worked...
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT
);
params.setMargins(0, 10, 0, 0);
firstName.setLayoutParams(params);

You can use the setMargins() on the LinearLayout.LayoutParams. See the answer of this StackOverflow question for more information.

TextView tv = (TextView)findViewById(R.id.item_title));
RelativeLayout.LayoutParams mRelativelp = (RelativeLayout.LayoutParams) tv
.getLayoutParams();
mRelativelp.setMargins(DptoPxConvertion(15), 0, DptoPxConvertion (15), 0);
tv.setLayoutParams(mRelativelp);
private int DptoPxConvertion(int dpValue)
{
return (int)((dpValue * mContext.getResources().getDisplayMetrics().density) + 0.5);
}
getLayoutParams() of textview should be casted to the corresponding Params based on the Parent of the textview in xml.
<RelativeLayout>
<TextView
android:id="#+id/item_title">
</RelativeLayout>
If parent of the TextView is RelativeLayout means, then RelativeLayout.LayoutParams as above. If parent is LinearLayout means then
LinearLayout.LayoutParams mLinearlp = (LinearLayout.LayoutParams) tv
.getLayoutParams();
To render the same real size on different devices use DptoPxConvertion() method which I have used above. setMargin(left,top,right,bottom) params will take values in pixel not in dp.

How to set layout_weight attribute dynamically from code?

How can I set the value for the attribute layout_weight for button in android dynamically from java code ?

You can pass it in as part of the LinearLayout.LayoutParams constructor:
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(
LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT,
1.0f
);
YOUR_VIEW.setLayoutParams(param);
The last parameter is the weight.

Use LinearLayout.LayoutParams:
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
params.weight = 1.0f;
Button button = new Button(this);
button.setLayoutParams(params);
EDIT: Ah, Erich's answer is easier!

If you already define your view in your layout(xml) file, only want to change the weight programmatically, this way is better
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)
mButton.getLayoutParams();
params.weight = 1.0f;
mButton.setLayoutParams(params);
new a LayoutParams overwrites other params defined in you xml file like margins, or you need to specify all of them in LayoutParams.

If the constructor with width, height and weight is not working, try using the constructor with width and height. And then manually set the weight.
And if you want the width to be set according to the weight, set width as 0 in the constructor. Same applies for height.
Below code works for me.
LinearLayout.LayoutParams childParam1 = new LinearLayout.LayoutParams(0,LinearLayout.LayoutParams.MATCH_PARENT);
childParam1.weight = 0.3f;
child1.setLayoutParams(childParam1);
LinearLayout.LayoutParams childParam2 = new LinearLayout.LayoutParams(0,LinearLayout.LayoutParams.MATCH_PARENT);
childParam2.weight = 0.7f;
child2.setLayoutParams(childParam2);
parent.setWeightSum(1f);
parent.addView(child1);
parent.addView(child2);

If layoutparams is already defined (in XML or dynamically), Here's a one liner:
((LinearLayout.LayoutParams) mView.getLayoutParams()).weight = 1;

If I someone looking for answer, use this:
LinearLayout.LayoutParams lay = (LinearLayout.LayoutParams) myLayout.getLayoutParams();
lay.weight = 0.5;
If you are initializing your layout from xml file, this will be much more convenient than providing new layout parameters for Linear Layout.

Any of LinearLayout.LayoutParams and TableLayout.LayoutParams worked for me, for buttons the right one is TableRow.LayoutParams. That is:
TableRow.LayoutParams buttonParams = new TableRow.LayoutParams(
TableRow.LayoutParams.MATCH_PARENT,
TableRow.LayoutParams.WRAP_CONTENT, 1f);
About using MATCH_PARENT or WRAP_CONTENT be the same.

If you have already defined your view in layout(xml) file and only want to change the weight pro grammatically, then then creating new LayoutParams overwrites other params defined in you xml file.
So first you should use "getLayoutParams" and then setLayoutParams
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) mButton.getLayoutParams();
params.weight = 4f;
mButton.setLayoutParams(params);

I have done my task by adding this line of code!
LinearLayout.LayoutParams mylayout = (LinearLayout.LayoutParams)
myview.getLayoutParams();
mylayout.weight = 2;
myview.setLayoutParams(mylayout);

Using Kotlin you can do something like:
import android.content.Context
import android.support.v4.content.ContextCompat
import android.support.v7.widget.CardView
import android.widget.*
import android.widget.LinearLayout
class RespondTo : CardView {
constructor(context: Context) : super(context) {
init(context)
}
private fun init(context: Context) {
val parent = LinearLayout(context)
parent.apply {
layoutParams = LinearLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,
FrameLayout.LayoutParams.WRAP_CONTENT, 1.0f).apply {
orientation = LinearLayout.HORIZONTAL
addView(EditText(context).apply {
id = generateViewId()
layoutParams = LinearLayout.LayoutParams(0,
LinearLayout.LayoutParams.WRAP_CONTENT, 0.9f).apply {
}
})
addView(ImageButton(context).apply({
layoutParams = LinearLayout.LayoutParams(0,
LinearLayout.LayoutParams.WRAP_CONTENT, 0.1f)
background = null
setImageDrawable(ContextCompat.getDrawable(context, R.drawable.ic_save_black_24px))
id = generateViewId()
layoutParams = RelativeLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT).apply {
addRule(RelativeLayout.ALIGN_PARENT_RIGHT)
// addRule(RelativeLayout.LEFT_OF, myImageButton.id)
}
}))
}
}
this.addView(parent)
}
}

if you want to set weight to LinearLayout then use code mentioned below or set weight to Relative Layout then replace it with Relative Layout
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(
LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT,
1.0f
);
YOUR_VIEW.setLayoutParams(param);

You can try this approach.
First, you get the LayoutParams associated with this Button. Perform a type conversion.
LinearLayout.LayoutParams linearLayoutParams = (LinearLayout.LayoutParams) button.getLayoutParams();
Then assign the required value of the "weight" parameter.
linearLayoutParams.weight = 5;
Redraw the layout.
button.requestLayout();