I've created a custom view which should change it's background image when pressed, highlighted or disabled. The app runs but the button doesn't change it's background.
here's my code:
public class CustomImageButton extends View {
public CustomImageButton(Context context) {
super(context);
setFocusable(true);
setClickable(true);
}
public CustomImageButton(Context context, AttributeSet attrs) {
super(context, attrs);
setFocusable(true);
setClickable(true);
}
public CustomImageButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setFocusable(true);
setClickable(true);
}
protected Drawable background = super.getBackground();
@Override
public void setBackgroundDrawable(Drawable d) {
// Replace the original background drawable (e.g. image) with a LayerDrawable that
// contains the original drawable slightly edited.
CustomImageButtonBackgroundDrawable layer = new CustomImageButtonBackgroundDrawable(d);
super.setBackgroundDrawable(layer);
}
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int drawableWidth = super.getBackground().getMinimumWidth();
int drawableHeight = super.getBackground().getMinimumHeight();
setMeasuredDimension(drawableWidth, drawableHeight);
}
protected class CustomImageButtonBackgroundDrawable extends LayerDrawable {
protected Drawable lowerlayer;
protected Drawable _highlightedDrawable;
protected int _disabledAlpha = 100;
protected Drawable _pressedDrawable;
public CustomImageButtonBackgroundDrawable(Drawable d) {
super(new Drawable[] { d });
}
@Override
protected boolean onStateChange(int[] states) {
boolean enabled = false;
boolean highlighted = false;
boolean pressed = false;
for (int state : states) {
if (state == android.R.attr.state_enabled)
enabled = true;
else if (state == android.R.attr.state_selected)
highlighted = true;
else if (state == android.R.attr.state_pressed)
pressed = true;
}
mutate();
if (enabled && highlighted) {
ColorFilter colourFilter = new LightingColorFilter(Color.YELLOW, 1);
ScaleDrawable resizedImage = new ScaleDrawable(background, 0, 1.25f, 1.25f);
lowerlayer = resizedImage.getDrawable();
lowerlayer.setColorFilter(colourFilter);
Drawable[] aD = new Drawable[2];
aD[0] = lowerlayer;
aD[1] = background;
LayerDrawable _highlightedDrawable = new LayerDrawable(aD);
setBackgroundDrawable(_highlightedDrawable); // buttons need transparent backgrounds
} else if (!enabled) {
setColorFilter(null);
setAlpha(_disabledAlpha);
} else if (enabled && pressed){
ScaleDrawable smaller = new ScaleDrawable(background, 0, 0.75f, 0.75f);
setBackgroundDrawable(smaller.getDrawable());
} else if(enabled){
setBackgroundDrawable(background);
setColorFilter(null);
}
invalidateSelf();
return super.onStateChange(states);
}
}
}
Here's my xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ffffff">
<ImageButton
android:id="@+id/title"
android:layout_width="250dp"
android:layout_height="58dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_margin ="25dp"
android:background="@drawable/skintonetitle" />
<custombuttons.CustomImageButton
android:id="@+id/skina1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/title"
android:layout_below="@+id/title"
android:layout_marginTop="35dp"
android:background="@drawable/test_circle"
android:clickable="true"
android:focusable="true" />
</RelativeLayout>
Something I've missed?
It extends from View, not button, so it's not clickable or focusable by default. Adjust with
android:clickable="true"
android:focusable="true"
in your XML.
You can also set these in the constructor of your View class if you want to do it in java:
setFocusable(true);
setClickable(true);
in my case I was using a custom view with a constraint layout as the root .and I was not getting click events on setOnClickListener of my custom view,it turns out that I needed to set android:clickable="false"
in the root of my xml for the custom view.apparently , the click event is dispatched to the root of my custom view xml rather than to the custom view it self (i.e setOnClickListener of the custom view )
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