PlayPauseView.java

package com.simplecity.amp_library.ui.views;

import android.animation.Animator;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Outline;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewOutlineProvider;
import android.view.animation.DecelerateInterpolator;
import android.widget.FrameLayout;

public class PlayPauseView extends FrameLayout {

    private static final long PLAY_PAUSE_ANIMATION_DURATION = 200;

    private final PlayPauseDrawable mDrawable;
    private final Paint mPaint = new Paint();

    private Animator mAnimator;
    private int mBackgroundColor;
    private int mWidth;
    private int mHeight;

    public PlayPauseView(Context context, AttributeSet attrs) {
        super(context, attrs);
        setWillNotDraw(false);
        mPaint.setAntiAlias(true);
        mPaint.setStyle(Paint.Style.FILL);
        mDrawable = new PlayPauseDrawable(context);
        mDrawable.setCallback(this);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        final int size = Math.min(getMeasuredWidth(), getMeasuredHeight());
        setMeasuredDimension(size, size);
    }

    @Override
    protected void onSizeChanged(final int w, final int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        mDrawable.setBounds(0, 0, w, h);
        mWidth = w;
        mHeight = h;

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            setOutlineProvider(new ViewOutlineProvider() {
                @TargetApi(Build.VERSION_CODES.LOLLIPOP)
                @Override
                public void getOutline(View view, Outline outline) {
                    outline.setOval(0, 0, view.getWidth(), view.getHeight());
                }
            });
            setClipToOutline(true);
        }
    }

    private void setColor(int color) {
        mBackgroundColor = color;
        invalidate();
    }

    private int getColor() {
        return mBackgroundColor;
    }

    @Override
    protected boolean verifyDrawable(Drawable who) {
        return who == mDrawable || super.verifyDrawable(who);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        mPaint.setColor(mBackgroundColor);
        final float radius = Math.min(mWidth, mHeight) / 2f;
        canvas.drawCircle(mWidth / 2f, mHeight / 2f, radius, mPaint);
        mDrawable.draw(canvas);
    }

    public void toggle() {
        if (mAnimator != null) {
            mAnimator.cancel();
        }

        mAnimator = mDrawable.getPausePlayAnimator();
        mAnimator.setInterpolator(new DecelerateInterpolator());
        mAnimator.setDuration(PLAY_PAUSE_ANIMATION_DURATION);
        mAnimator.start();
    }

    public boolean isPlay() {
        return mDrawable != null && mDrawable.isPlay();
    }
}