How to customize the width and height when show an Activity as a Dialog

Question

If I have defined a Activity:

public class DialogActivity extends Activity{

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(dialog_activity.xml);
    }


}

I would like to display the above activity like a dialog, so in the AndroidManifest.xml file, I declare this activity like below:

<activity android:name=".DialogActivity" android:theme="@android:style/Theme.Dialog"/>

Everything is fine at this point, my DialogActivity showed as a dialog.

The problem is How to customize the width and height of the DialogActivity to make it more like a small dialog? (Currently it occupies most of the screen by default)

----------------------------Update-----------------------

I defined a custom theme like below:

<style name="myDialog" parent="@android:style/Theme.Dialog">
        <item name="android:windowFrame">@null</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:windowIsFloating">true</item>
        <item name="android:windowContentOverlay">@null</item>

        <item name="android:width">100dip</item> 
        <item name="android:height">100dip</item>

</style>

Then, declare the DialogActivity in AndroidManifest.xml as.

<activity android:name=".DialogActivity" android:theme="@style/myDialog"/>

My DialogActivity now even occupies the whole screen:( . The width and height definition:

<item name="android:width">100dip</item>

in the theme do not take any effect, why?

Answer 1

I finally figured out one way to customize the size of my DialogActivity.

That's inside the onCreate() method of DialogActivity, add the following code:

WindowManager.LayoutParams params = getWindow().getAttributes();  
params.x = -20;  
params.height = 100;  
params.width = 550;  
params.y = -10;  

this.getWindow().setAttributes(params);