How can I get a Dialog style activity window to fi

Question

I am using an activity with the dialog theme set, and I want it to be full screen. I tried all sorts of things, even going through the WindowManager to expand the window to full width and height manually, but nothing works.

Apparently, a dialog window (or an activity with the dialog theme) will only expand according to its contents, but even that doesn't always work. For instance, I show a progress bar circle which has width and height set to FILL_PARENT (so does its layout container), but still, the dialog wraps around the much smaller progress bar instead of filling the screen.

There must be a way of displaying something small inside a dialog window but have it expand to full screen size without its content resizing as well?

Answer 1

Wrap your dialog_custom_layout.xml into RelativeLayout instead of any other layout.That worked for me.

Answer 2

This answer is a workaround for those who use "Theme.AppCompat.Dialog" or any other "Theme.AppCompat.Dialog" descendants like "Theme.AppCompat.Light.Dialog", "Theme.AppCompat.DayNight.Dialog", etc. I myself has to use AppCompat dialog because i use AppCompatActivity as extends for all my activities. There will be a problem that make the dialog has padding on every sides(top, right, bottom and left) if we use the accepted answer.

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.your_layout);

    getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
}

On your Activity's style, add these code

<style name="DialogActivityTheme" parent="Theme.AppCompat.Dialog">
    <item name="windowNoTitle">true</item>
    <item name="android:windowBackground">@null</item>
</style>

As you may notice, the problem that generate padding to our dialog is "android:windowBackground", so here i make the window background to null.

Answer 3

You may add this values to your style android:windowMinWidthMajor and android:windowMinWidthMinor

<style name="Theme_Dialog" parent="android:Theme.Holo.Dialog">
    ...
    <item name="android:windowMinWidthMajor">96%</item>
    <item name="android:windowMinWidthMinor">96%</item>
</style>

The minimum width the window is allowed to be, along the minor axis of the screen.

Answer 4

I just want to fill only 80% of the screen for that I did like this below

        DisplayMetrics metrics = getResources().getDisplayMetrics();
        int screenWidth = (int) (metrics.widthPixels * 0.80);

        setContentView(R.layout.mylayout);

        getWindow().setLayout(screenWidth, LayoutParams.WRAP_CONTENT); //set below the setContentview

it works only when I put the getwindow().setLayout... line below the setContentView(..)

thanks @Matthias