I have searched around and I found good examples on adding custom
boolean states to a drawable but I am having issues adding a state
that is a list of enums. I am sure most of my problems lie within the
onCreateDrawableState call so I have a few questions.
1) Is the extraSpace param to onCreateDrawableState the number of
additional int[] that I would like to add or the size of the int[]? So
since I am just adding MODE I should just be increasing extraSpace by
1 and not by MODE.length?
2) I don't quite understand the mergeDrawableStates method. If I put
it in an IF statement I am getting what I expect, but I think I am
just getting lucky. I don't feel my IF check is correct. My initial
assumption was that I don't do a check and always call
mergeDrawableStates but then the drawable never changes. I have seen
where if the extra state is a boolean then the if statement checks for
that. I don't quite know what to do about an enum.
3) When I do get it working, my ic_button_a is drawn correctly.
However every time when ic_button_c is getting drawn, ic_button_c is
resized and stretch to fit the View which includes a background
graphic that is larger than ic_button_c. ic_button_a and ic_button_a
are the same size.
I have my custom view:
<com.pkg.CustomView
android:background="@drawable/ic_button_bg"
android:src="@drawable/ic_button"
android:layout_height="wrap_content"
android:layout_width="wrap_content"/>
which extends ImageButton.:
public class CustomView extends ImageButton {
private static final int[] MODE = {R.attr.mode};
private int mMode = 1;
@Override
public int[] onCreateDrawableState(int extraSpace) {
final int[] drawableState =
super.onCreateDrawableState(extraSpace + 1);
if (mMode != 0) {
mergeDrawableStates(drawableState, MODE);
}
return drawableState;
}
public void setMode(int mode) {
mMode = mode;
refreshDrawableState();
}
}
I am defining my modes here:
<resources>
<declare-styleable name="CaptureButton">
<attr name="mode">
<enum name="a" value="0" />
<enum name="b" value="1" />
<enum name="c" value="2" />
<enum name="d" value="3" />
<enum name="e" value="4" />
<enum name="f" value="5" />
<enum name="g" value="6" />
<enum name="h" value="7" />
</attr>
</declare-styleable>
</resources>
My @drawable/ic_button is:
<selector xmlns:android="http://schemas.android.com/apk/res/android";
xmlns:app="http://schemas.android.com/apk/res/com.pkg";>
<item app:mode="c" android:drawable="@drawable/ic_button_c" />
<item android:drawable="@drawable/ic_button_a" />
</selector>
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