src/com/android/settings/widget/FloatingActionButton.java

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.settings.widget;

import android.animation.AnimatorInflater;
import android.content.Context;
import android.graphics.Outline;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewOutlineProvider;
import android.widget.ImageView;

import com.android.settings.R;

public class FloatingActionButton extends ImageView {

    public FloatingActionButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        setScaleType(ScaleType.CENTER);
        setStateListAnimator(AnimatorInflater.loadStateListAnimator(context, R.anim.fab_elevation));
        setOutlineProvider(new ViewOutlineProvider() {
            @Override
            public void getOutline(View view, Outline outline) {
                outline.setOval(0, 0, getWidth(), getHeight());
            }
        });
        setClipToOutline(true);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        invalidateOutline();
    }
}