Get root view from current activity

问题:

I know how to get the root view with View.getRootView(). I am also able to get the view from a button\'s onClick event where the argument is a View. But how can I get the view in an activity?

回答1:

If you need root view of your activity (so you can add your contents there) use

findViewById(android.R.id.content)

Also it was reported that on some devices you have to use

getWindow().getDecorView().findViewById(android.R.id.content)

instead.

Please note that as Booger reported, this may be behind navigation bar (with back button etc.) on some devices (but it seems on most devices it is not).

If you need to get view that you added to your activity using setContentView() method then as pottedmeat wrote you can use

final ViewGroup viewGroup = (ViewGroup) ((ViewGroup) this
            .findViewById(android.R.id.content)).getChildAt(0);

But better just set id to this view in your xml layout and use this id instead.

回答2:

This is what I use to get the root view as found in the XML file assigned with setContentView:

final ViewGroup viewGroup = (ViewGroup) ((ViewGroup) this
            .findViewById(android.R.id.content)).getChildAt(0);

回答3:

I tested this in android 4.0.3, only:

getWindow().getDecorView().getRootView()

give the same view what we get from

anyview.getRootView();

com.android.internal.policy.impl.PhoneWindow$DecorView@#########

and

getWindow().getDecorView().findViewById(android.R.id.content)

giving child of its

android.widget.FrameLayout@#######

Please confirm.

回答4:

Get root view from current activity.

Inside our activity we can get the root view with:

ViewGroup rootView = (ViewGroup) ((ViewGroup) this
            .findViewById(android.R.id.content)).getChildAt(0);

or

View rootView = getWindow().getDecorView().getRootView();

回答5:

Just incase Someone needs an easier way:

The following code gives a view of the whole activity:

View v1 = getWindow().getDecorView().getRootView();

To get a certian view in the activity,for example an imageView inside the activity, simply add the id of that view you want to get:

View v1 = getWindow().getDecorView().getRootView().findViewById(R.id.imageView1);

Hope this helps somebody

回答6:

anyview.getRootView(); will be the easiest way.

回答7:

In Kotlin we can do it a little shorter:

val rootView = window.decorView.rootView

回答8:

to get View of the current Activity

in any onClick we will be getting \"View view\", by using \'view\' get the rootView.

View view = view.getRootView();

and to get View in fragment

View view = FragmentClass.getView();

回答9:

if you are in a activity, assume there is only one root view,you can get it like this.

ViewGroup viewGroup = (ViewGroup) ((ViewGroup) this
        .findViewById(android.R.id.content)).getChildAt(0);

you can then cast it to your real class

or you could using

getWindow().getDecorView();

notice this will include the actionbar view, your view is below the actionbar view