How to Get Activity's Content View

How to get Activity's content view?

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

or

this.findViewById(android.R.id.content)

or

this.findViewById(android.R.id.content).getRootView()

How to get current content view of activity?

public class MainActivity extends AppCompatActivity {

Boolean isClose = true;
Button btn;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btn = (Button) findViewById(R.id.button);
}

public void onpressed(View view){
    isClose = false;
    setContentView(R.layout.second);
}

@Override
public void onBackPressed() {
    if (isClose){
        finish();
    } else {
        setContentView(R.layout.activity_main);
        isClose = true;
    }
}

}

How to get Activity's view?

The only thing that you need is set an id of you root view and create an instance of it.

activity_main.xml

<LineaLayout
  ...
  android:id="my_root">
  ...

</LinearLayout>

MainActivity

private LinearLayout mRootView;
onCreate(...){
  ...
  mRootView = (LinearLayout) findViewById(R.id.my_root);
  ... 
}

And, in you alert dialog just create a snackbar like:

Snackbar.make(mRootView, "Wrong password. Try again.", Snackbar.LENGTH_LONG).setAction("Action", null).show();

How to get view from main Activity

There are quite several ways to do this :

this.Window.DecorView.RootView;

or

this.Window.DecorView.FindViewById(Android.Resource.Id.Content);

or

this.FindViewById(Android.Resource.Id.Content);

or

this.FindViewById(Android.Resource.Id.Content).RootView;

or

((ViewGroup) this.FindViewById(Android.Resource.Id.Content)).GetChildAt(0);

Although, since it's probably a layout, not a single view, I recommend using ViewGroup instead of View (these methods returns View so you have to cast them to ViewGroup if you want)

=================

Credit to this answer

Get root view from current activity

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

findViewById(android.R.id.content).getRootView()

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.

How to get current content view in Android programming?

Citing Any easy, generic way in Android to get the root View of a layout?

This answer and comments give one method: [Get root view from current activity

findViewById(android.R.id.content)

Given any view in your hierarchy you can also call:

view.getRootView()

to obtain the root view of that hierarchy.

The "decor view" can also be obtained via getWindow().getDecorView(). This is the root of the view hierarchy and the point where it attaches to the window, but I'm not sure you want to be messing with it directly.

How to set the content view of a Activity from another actvity

I would add a callback to your Dialog that you simply invoke to set your content, something like

class MyDialog(val switchChangedCallback: (Boolean) -> Unit) : DialogFragment() ...

When you change the switch, invoke the callback and handle the result in the Activity:

val dialog = MyDialog(switchChangedCallback = { isOn ->
                if (isOn) {
                    setContentView(R.layout.abc)
                } else {
                    setContentView(R.layout.def)
                }
            })

dialog.show(supportFragmentManager, MyDialog::class.java.name)

You may need to check that the callback survives app rotation!

Go back to activity contentView after having set contentView to web view in android

Dont call setContentView twice. You should put your webview in activity_login file like:

<WebView android:id="@+id/webview"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:visibility="invisible"/>

And when the theLogin Button clicked do your operations. Also dont forget set visibility for your webview.setVisibility(View.VISIBLE).

hope it helps

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