Develop Reference

android textview set height does not work

I am trying to create a layout with nested linear layouts and textviews which are placed vertically in a linear layout. They are created programatically. While I can set the height of the linear layout using layout Params I am not able to do this for textview. Using Textview setLayoutParams or setHeight function provides no response. The text is always wrapped around the content (though this is no where mentioned by me in the code). Can someone help me fix this?

this code might help you:
LinearLayout.LayoutParams paramsLayoutExpire = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
TextView txtView=new TextView(this);
txtView.setLayoutParams(paramsTextViewExpire);
LayoutParams.MATCH_PARENT: Height
LayoutParams.WRAP_CONTENT: Width

I hope this might help
TextView textView = new TextView(this);
textView.setText("Hellow World");
textView.setHeight(prefered_height_in_pixel);
this.addView(textView)

LinearLayoutParams are causing a casting issue

I must be missing something really stupid.
I have a LinearLayout in my view:
_editTextViews = (LinearLayout)findViewById(R.id.editDesAndLocViews);
I am trying to dynamically change the height of that view by setting the LayoutParams
I have two LinearLayout.LayoutParams
LinearLayout.LayoutParams collapsedParams;
LinearLayout.LayoutParams openParams;
that are set in the constructor like so:
collapsedParams = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT,0);
openParams = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);
But as soon as i try to apply one of those params to my LinearLayout, like so:
_editTextViews.setLayoutParams(collapsedParams);
I get the following FATAL EXCEPTION:
At first i thought my project needed to be cleaned as it seems to think i am trying to force a relative layout to use linear layout params, but everything is LinearLayout. The LinearLayout in question does contain a couple RelativeLayouts. I don't know if / why that would be the problem.
please help

Change your LayoutParamss' type to either ViewGroup.LayoutParams or RelativeLayout.LayoutParams.
The LayoutParams you apply have to match the parent layout of the view. LayoutParams define how a View is layed out in its parent view (layout). Because each layout type takes different parametres for laying out a view (e.g. only LinearLayout has weight, only RelativeLayout can use anchors), they all have their own LayoutParams.

android: retain attributes children in RelativeLayout dynamically adding ImageViews

How can I retain attributes of the children in a RelativeLayout when dynamically adding ImageViews?
I have a custom ImageView I want to add at runtime to an empty RelativeLayout (nothing inside in XML), I can add the first, then move, scale and rotate them, it works fine.
When I add another ImageView all previously added instances loose their position and their size, but when I touch them they get back just their size, not the position.
In my ImageView I'm overriding onDraw and onTouch, do I need to override something else?
Maybe I have to write my own RelativeLayout implementation? I wouldn't!
This is the pseudocode for adding new ImageView:
create new instance of ImageView
set bitmap
set scaletype
add imageview to the RelativeLayout container
I even tried to set a standard layout parameter for the brand new added ImageView with the same result.
I tried to get the margins for every children, based on its position, and the re set the layout with ImgeView.setLayout(l, t, r, b);
no success...
Here's the XML RelativeLayout container, pretty simple, maybe too much?
<RelativeLayout
android:id="#+id/face_container"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</RelativeLayout>
Do you need more details to help me? Please ask, I can post the code too, but I have to clean it up a bit before, I can do it tomorrow, in the meantime please give me some advice.

In a RelativeLayout all view positions are related to the others views. So, as you do in xml, you should provide for each view the relative parameters.
Before add imageView to the RelativeLayout call setLayoutParams(layoutParams):
// Create a new RelativeLayout.LayoutParams instance
RelativeLayout.LayoutParams layoutParams =
new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
// add roules
layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);
layoutParams.addRule(.........
layoutParams.addRule(.........
//add params to view
imageView.setLayoutParams(layoutParams);
//add imageview to the RelativeLayout container
yourRelativeLayout.addView(imageView);
Look here for all rules.

Android add View

I have the following problem:
The code below successfully adds my TextView to my custom RelativeLayout:
RectF rectRecord = getItemRect(trCurrent);
TextView tv = new TextView(this.getContext());
tv.setLeft((int)rectRecord.left);
tv.setRight((int)rectRecord.right);
tv.setTop((int)rectRecord.top);
tv.setBottom((int)rect.bottom);
addView(tv);
Unfortunately the methods ("setLeft,setRight,setTop,setBottom") aren't available on Android older than 3.0.
So I tried to add my TextView the alternative way:
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
params.setMargins((int)rectRecord.left, (int)rectRecord.top, (int)rectRecord.right, (int)rectRecord.bottom);
//tv.setLayoutParams(tv);
addView(tv, params);
Doing it that way does not show a child control ...
I already tried to change the class my host control derives from ViewGroup to LinearLayout, RelativeLayout and the deprecated AbsoluteLayout but always the same.
Also removed my custom onDraw and onMeasure and "setWillNotDraw(false);" but that didn't solved my problem.
Snippet 1 is displaying my child views.
Snippet 2 does not show a child.
Can anyone point to the solution for this problem?

Your margins are set to 1234 - that's 1234 dip (density independent PIXELS) and that is huge. Your control doesn't show up on the screen because margins are too big, and your control has no place to show on the screen.

Android - Aligning a view (button) within another View in code?

I have a custom view which will be jar'ed up and added into another project. In the view I want to give an option of a button.
Here is what I have in the CustomView class.
final CustomView currentView = (CustomView) findViewById(this.getId());
RelativeLayout.LayoutParams params = (new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,RelativeLayout.LayoutParams.WRAP_CONTENT ));
params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
closeButton.setLayoutParams(params);
currentView.addView(closeButton);
This is all wrapped in a RelativeLayout Tag as well as the other objects of the application
Everything compiles however in the CustomView the Button is aligning left instead of right.Any Ideas???

I would guess the problem is your CustomView. It probably doesn't take the entire width of the window, and is just wide enough to fill its children (which, in your case, is the close button). Make sure your CustomView has a fill_parent horizontal layout.
Since your CustomView extends WebView, which, in turn, extends AbsoluteLayout, you can't expect it to handle RelativeLayout's parameters. Instead, it's best you put your customview and your close button inside a RelativeLayout and position them properly.

When adding your closeButton to your currentView you need to supply the LayoutParams as an argument as well in order for them to take effect.
Basically, switch
currentView.addView(closeButton);
with
currentView.addView(closeButton, params);
Since the width of your button is set to wrap_content, you could also try setting its layout_gravity to right.
params.gravity = Gravity.RIGHT;