Being DialogFragment
a wrapper for the Dialog
class, you should set a theme to your base Dialog
to get the animation you want:
public class CustomDialogFragment extends DialogFragment implements OnEditorActionListener
{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
return super.onCreateView(inflater, container, savedInstanceState);
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
{
// Set a theme on the dialog builder constructor!
AlertDialog.Builder builder =
new AlertDialog.Builder( getActivity(), R.style.MyCustomTheme );
builder
.setTitle( "Your title" )
.setMessage( "Your message" )
.setPositiveButton( "OK" , new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which) {
dismiss();
}
});
return builder.create();
}
}
Then you just need to define the theme that will include your desired animation. In styles.xml add your custom theme:
<style name="MyCustomTheme" parent="@android:style/Theme.Panel">
<item name="android:windowAnimationStyle">@style/MyAnimation.Window</item>
</style>
<style name="MyAnimation.Window" parent="@android:style/Animation.Activity">
<item name="android:windowEnterAnimation">@anim/anim_in</item>
<item name="android:windowExitAnimation">@anim/anim_out</item>
</style>
Now add the animation files in the res/anim folder:
( the android:pivotY
is the key )
anim_in.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<scale
android:interpolator="@android:anim/linear_interpolator"
android:fromXScale="0.0"
android:toXScale="1.0"
android:fromYScale="0.0"
android:toYScale="1.0"
android:fillAfter="false"
android:startOffset="200"
android:duration="200"
android:pivotX = "50%"
android:pivotY = "-90%"
/>
<translate
android:fromYDelta="50%"
android:toYDelta="0"
android:startOffset="200"
android:duration="200"
/>
</set>
anim_out.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<scale
android:interpolator="@android:anim/linear_interpolator"
android:fromXScale="1.0"
android:toXScale="0.0"
android:fromYScale="1.0"
android:toYScale="0.0"
android:fillAfter="false"
android:duration="200"
android:pivotX = "50%"
android:pivotY = "-90%"
/>
<translate
android:fromYDelta="0"
android:toYDelta="50%"
android:duration="200"
/>
</set>
Finally, the tricky thing here is to get your animation grow from the center of each row. I suppose the row is filling the screen horizontally so, on one hand the android:pivotX
value will be static. On the other hand, you can't modify the android:pivotY
value programmatically.
What I suggest is, you define several animations each of which having a different percentage value on the android:pivotY
attribute (and several themes referencing those animations). Then, when the user taps the row, calculate the Y position in percentage of the row on the screen. Knowing the position in percentage, assign a theme to your dialog that has the appropriate android:pivotY
value.
It is not a perfect solution but could do the trick for you. If you don't like the result, then I would suggest forgetting the DialogFragment
and animating a simple View
growing from the exact center of the row.
Good luck!