Merge "Do not run background animation without a Looper" into sc-dev

import android.graphics.Rect;

import android.graphics.Shader;

import android.os.Build;

import android.os.Looper;

import android.util.AttributeSet;

import android.util.Log;

import android.view.animation.AnimationUtils;

import android.view.animation.LinearInterpolator;

 * @attr ref android.R.styleable#RippleDrawable_color

 */

public class RippleDrawable extends LayerDrawable {

    private static final String TAG = "RippleDrawable";

    /**

     * Radius value that specifies the ripple radius should be computed based

     * on the size of the ripple's container.

    private void startBackgroundAnimation() {

        mRunBackgroundAnimation = false;

        if (Looper.myLooper() == null) {

            Log.w(TAG, "Thread doesn't have a looper. Skipping animation.");

            return;

        }

        mBackgroundAnimation = ValueAnimator.ofFloat(mBackgroundOpacity, mTargetBackgroundOpacity);

        mBackgroundAnimation.setInterpolator(LINEAR_INTERPOLATOR);

        mBackgroundAnimation.setDuration(BACKGROUND_OPACITY_DURATION);