Develop Reference

Changing WRAP_CONTENT to a set number using LinearLayout.LayoutParams

I have set up some LinearLayout.LayoutParams to set up some buttons just using java. But I want to change it from WRAP_CONTENT to a height and width of my choice.
//LinearLayout.LayoutParams top;
//this is declared at the top as it is used by different bits of the code.
top = new LinearLayout.LayoutParams
(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
top.topMargin = 100;
top.leftMargin = 120;

top = new LinearLayout.LayoutParams
(90, 80);
// whatever u like
this is from documentation:
public LayoutParams(int width, int height) {
super(width, height);
weight = 0;
}

According to ViewGroup.MarginLayoutParams.html#setMargins you have to use this:
LinearLayout layout = (LinearLayout)findViewById(R.id.yourLinear_Layout);
LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
params.setMargins(120, 100, 0, 0); //Here your custom margin (int left, int top, int right, int bottom)
layout.setLayoutParams(params);

Have you tried?
top.getLayoutParams().height = 256;
top.getLayoutParams().width= 256;
top.requestLayout();

try like this..
LinearLayout layout = (LinearLayout)findViewById(R.id.numberPadLayout);
// Gets the layout params that will allow you to resize the layout
LayoutParams params = layout.getLayoutParams();
// Changes the height and width to the specified *pixels*
params.height = 100;
params.width = 100;
layout.setLayoutParams(params);

How to make LinearLayout height to be the highest height of it's child component?

I add two Checkboxes dynamically to a Linearlayout. Then those Linearlayouts are added one after another in a Relativelayout. The weights of the checkboxes are set so that each take 50% of the Linearlayout width. Now, if their heights do not match, the bottom of the checkbox with bigger height disappears. How to solve this? Here's a screenshot:
And the code:
LinearLayout ll;
LinearLayout.LayoutParams lp;
CheckBox ch;
int id = 1200, i, j;
for (i = 0, j = 0; i < selections.size() - 1; i += 2, j += 2) {
ll = new LinearLayout(NotificationSettings.this);
lp = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
ch = new CheckBox(NotificationSettings.this);
lp.weight = 1.0f;
ch.setLayoutParams(lp);
ch.setText(selections.get(i));
ch.setChecked(isSelected);
ch.setTextColor(color);
ch.setId(j);
ll.addView(ch);
ch = new CheckBox(NotificationSettings.this);
ch.setLayoutParams(lp);
ch.setText(selections.get(i + 1));
ch.setChecked(isSelected);
ch.setTextColor(color);
ch.setId(j + 1);
ll.addView(ch);
RelativeLayout.LayoutParams p = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
if (id == 1200)
p.addRule(RelativeLayout.BELOW, addBelow);
else
p.addRule(RelativeLayout.BELOW, id);
ll.setLayoutParams(p);
ll.setId(++id);
rl.addView(ll);
}
Edit:
When both checkboxes have multiple lines:

Can you make sure that the Linear Layout's height below it is not too large that it covers the above Linear Layout?
Or try changing your Relative Layout Params' height to WRAP_CONTENT
Change
RelativeLayout.LayoutParams p = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
To
RelativeLayout.LayoutParams p = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);

Set other layout parameters imageview

I would like to have an image on android that appears only when I click a button. So I created it in an onClick method, and set its ressource and position with the following code :
public void createAddButton() {
//create the image
ImageView imageView = new ImageView(this);
//setting image resource
imageView.setImageResource(R.drawable.add_16);
//setting image position : width and height
imageView.setLayoutParams(
new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT) );
}
But this only allows to define width and height of the image. If I want to define other layout parameters (android:layout_gravity or android:marginLeft for example, what should I do ?

LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
lp.gravity = Gravity.CENTER;
lp.bottomMargin = ...
lp.leftMargin = ...
lp.rightMargin = ...
lp.topMargin = ...
imageView.setLayoutParams(lp);

You have to use LayoutParams object to access those layout properties as below...
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
params.gravity = Gravity.CENTER;
params.leftMargin = 10;
imageView.setLayoutParams(params);

Android Linear Layout Weight Programmatically

I want to add three linear layouts to an activity programatically each of same width. the problem is i am not able to set the weights of these layouts programmatically. I could do this within xml, but I want to do this in program.
here is what I want:

Here its the solution
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(0, 100);
lp.weight = 1;
See Full Solution
LinearLayout ll1, ll2, ll3;
/* Find these LinearLayout by ID
i.e ll1=(LinearLayout)findViewById(R.id.ll1);
*/
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(0, 100);
lp.weight = 1;
ll1.setLayoutParams(lp);
ll2.setLayoutParams(lp);
ll3.setLayoutParams(lp);

Use new LinearLayout.LayoutParams(int width, int height, float weight) to set weights when setting layout params to the subviews

Do this way..
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtNote = (LinedEditText) findViewById(R.id.txtNote);
lnr = (LinearLayout) findViewById(R.id.lnr);
LinearLayout l1 = new LinearLayout(this);
LinearLayout l2 = new LinearLayout(this);
LinearLayout l3 = new LinearLayout(this);
l1.setBackgroundResource(android.R.color.holo_green_light);
l2.setBackgroundResource(android.R.color.holo_orange_dark);
l3.setBackgroundResource(android.R.color.holo_blue_bright);
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(0,LinearLayout.LayoutParams.MATCH_PARENT, 1);
lnr.addView(l1, param);
lnr.addView(l2, param);
lnr.addView(l3, param);
}

You can do it by setting layout weight property for your individual linear layouts, pass it in LinearLayout - LayoutParams constructor:
LinearLayout.LayoutParams param = new LinearLayout.LayoutParam(
LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT, 1);
or
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(
0,
LayoutParams.MATCH_PARENT, 1);
Hope it may help you !

Programmatically set button width to 50% of parent LinearLayout

I created a Dialog using LinearLayout and in this Dialog, I have a Button. I want to set its width to 50% of the Dialog's width, but no matter what I do, the button is still filling the entire width. The main problem seems to be that I cannot set the button's weight programmatically. I tried creating a second horizontal LinearLayout that would hold the button with weight set to 0.5f (the parent has a weightSum of 1), but that did not change anything. How can I set the button to be half the width?
I've looked at all the other questions but most of them were using xml so they were not relevant, and the one that solved it programmatically was using hardcoded values in pixels which is obviously an incorrect solution to the problem.
EDIT: Adding some code
LinearLayout linearLayout = new LinearLayout(mContext);
linearLayout.setOrientation(LinearLayout.VERTICAL);
linearLayout.setWeightSum(1);
// I use these params when I call addContentView
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
testButton = new Button(mContext);
testButton.setText("Test");
testButton.setId(1);
testButton.setWidth(0);
testButton.setGravity(Gravity.CENTER);
LinearLayout buttonLayout = new LinearLayout(mContext);
butonLayout.setOrientation(LinearLayout.HORIZONTAL);
LinearLayout.LayoutParams buttonParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT, 0.5f);
testButton.setLayoutParams(buttonParams);
buttonLayout.addView(testButton);
linearLayout.addView(buttonLayout);
...
this.addContentView(scrollView, layoutParams);

As I tried more and more options, the code became a mess. I decided to start from scratch and this code worked in the end:
LinearLayout forButton = new LinearLayout(mContext);
forButton.setOrientation(LinearLayout.HORIZONTAL);
LinearLayout.LayoutParams forButtonParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
forButton.setGravity(Gravity.CENTER);
DisplayMetrics dm = new DisplayMetrics();
this.getWindow().getWindowManager().getDefaultDisplay().getMetrics(dm);
int width = dm.widthPixels;
forButton.addView(testButton);
testButton.getLayoutParams().width = width/2;

Are you setting the width value to 0dp as well? This is required for the layout engine to automatically to use layout weight respectively.
Edit
I think this line will get you the results you are looking for:
LayoutParams buttonParams = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 0.5f);

To find dialog width
DisplayMetrics dm = new DisplayMetrics();
dialog.getWindow().getWindowManager().getDefaultDisplay().getMetrics(dm);
int width = dm.widthPixels ;
To Set Value programmatically
final LayoutParams lparams = new LayoutParams(Height,width/2); // Width , height
final Button button = new Button(this);
button.setLayoutParams(lparams);
EDIT
WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
lp.copyFrom(alertDialog.getWindow().getAttributes());
lp.width = 200;
lp.height = 200;
alertDialog.getWindow().setAttributes(lp);