Merge "Add api check to guard AnimatorSet behavior change" into nyc-dev

package android.animation;

import android.app.ActivityThread;

import android.app.Application;

import android.os.Build;

import android.util.ArrayMap;

import android.util.Log;

    // The total duration of finishing all the Animators in the set.

    private long mTotalDuration = 0;

    // In pre-N releases, calling end() before start() on an animator set is no-op. But that is not

    // consistent with the behavior for other animator types. In order to keep the behavior

    // consistent within Animation framework, when end() is called without start(), we will start

    // the animator set and immediately end it for N and forward.

    private final boolean mShouldIgnoreEndWithoutStart;

    public AnimatorSet() {

        super();

        mNodeMap.put(mDelayAnim, mRootNode);

        mNodes.add(mRootNode);

        // Set the flag to ignore calling end() without start() for pre-N releases

        Application app = ActivityThread.currentApplication();

        if (app == null || app.getApplicationInfo() == null) {

            mShouldIgnoreEndWithoutStart = true;

        } else if (app.getApplicationInfo().targetSdkVersion < Build.VERSION_CODES.N) {

            mShouldIgnoreEndWithoutStart = true;

        } else {

            mShouldIgnoreEndWithoutStart = false;

        }

    }

    /**

     */

    @Override

    public void end() {

        if (mShouldIgnoreEndWithoutStart && !isStarted()) {

            return;

        }

        mTerminated = true;

        if (isStarted()) {

            endRemainingAnimations();