The gravity should be set on the LinearLayout.LayoutParams instead. You
could also set it on rootContainer. When you call
LinearLayout.setGravity(), gravity applies to the children of the
LinearLayout. If you set the gravity on the LayoutParams, gravity is
applied by the parent on the child the LayoutParams belongs to.
On Tue, May 1, 2012 at 12:06 PM, Jason Teagle <teagle.ja...@gmail.com>wrote:
> Could you use a LinearLayout and set the layout_weight of each custom
>> view to 1?
>>
>
> Hmmm... yes, good call, but there's a slight twist. It seems that gravity
> doesn't work in LinearLayout. Consider the following code (in onCreate() ):
>
> ---
> super.onCreate(**savedInstanceState);
>
> // Create the root container, vertically.
> LinearLayout rootContainer = new LinearLayout(this);
> rootContainer.setOrientation(**LinearLayout.VERTICAL);
> // It fills the parent by default.
> rootContainer.**setBackgroundColor(Color.CYAN)**; // To confirm it does
> fill the parent.
>
> LinearLayout.LayoutParams constraints = null ;
>
> // Create a horizontal container to hold a row of controls in the main
> container.
> LinearLayout nestedContainer = new LinearLayout(this);
> nestedContainer.**setOrientation(LinearLayout.**HORIZONTAL);
>
> // Add a button to this nested container.
> Button goButton = new Button(this);
> goButton.setText("Go!");
>
> // Only as big as button needs to be, as little extra size as possible
> please:
> constraints = new LinearLayout.LayoutParams(**LayoutParams.WRAP_CONTENT,
> LayoutParams.WRAP_CONTENT, 0.0f);
> nestedContainer.addView(**goButton, constraints);
>
> // Add this nested container to the parent container, aligned to the right.
> nestedContainer.setGravity(**Gravity.RIGHT);
> // Only as big as container needs to be, as little extra size as possible
> please:
> constraints = new LinearLayout.LayoutParams(**LayoutParams.WRAP_CONTENT,
> LayoutParams.WRAP_CONTENT, 0.0f);
> rootContainer.addView(**nestedContainer, constraints);
>
> // Assume more rows would be added to the parent...
>
> setContentView(rootContainer);
> ---
>
>
> If you debug that, it (the nested container with button) comes out
> left-aligned instead of right. Can anyone see anything I might be doing
> wrong?
>
> This can be worked around by making the nested container FILL_PARENT, but
> then LinearLayout assigns all the extra width to the controls - making the
> button as wide as the physical display. The answer to that is to add empty
> LinearLayouts to the start or end of the row of components to emulate
> alignment. Makes a mockery of having gravity in the first place!
>
> On the whole, though, LinearLayout is a neater solution as it doesn't rely
> on resizing anything manually during a layout handler, so I'll be going
> with that.
>
> (@Mark: Your well-made point about writing my own ViewGroup didn't fall on
> deaf ears - I *did* start to subclass RelativeLayout, effectively writing
> my own ViewGroup with a lot of help from the system {;v) )
>
>
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--
Romain Guy
Android framework engineer
romain...@android.com
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