Merge "Be bug-compatible with Fragment#setUserVisibleHint < N" into nyc-dev

import android.content.res.Resources;

import android.content.res.TypedArray;

import android.os.Build;

import android.os.Build.VERSION_CODES;

import android.os.Bundle;

import android.os.Parcel;

import android.os.Parcelable;

     * This may be used by the system to prioritize operations such as fragment lifecycle updates

     * or loader ordering behavior.</p>

     *

     * <p><strong>Note:</strong> Prior to Android N there was a platform bug that could cause

     * <code>setUserVisibleHint</code> to bring a fragment up to the started state before its

     * <code>FragmentTransaction</code> had been committed. As some apps relied on this behavior,

     * it is preserved for apps that declare a <code>targetSdkVersion</code> of 23 or lower.</p>

     *

     * @param isVisibleToUser true if this fragment's UI is currently visible to the user (default),

     *                        false if it is not.

     */

    public void setUserVisibleHint(boolean isVisibleToUser) {

        if (!mUserVisibleHint && isVisibleToUser && mState < STARTED

                && mFragmentManager != null && isAdded()) {

        // Prior to Android N we were simply checking if this fragment had a FragmentManager

        // set before we would trigger a deferred start. Unfortunately this also gets set before

        // a fragment transaction is committed, so if setUserVisibleHint was called before a

        // transaction commit, we would start the fragment way too early. FragmentPagerAdapter

        // triggers this situation.

        // Unfortunately some apps relied on this timing in overrides of setUserVisibleHint

        // on their own fragments, and expected, however erroneously, that after a call to

        // super.setUserVisibleHint their onStart methods had been run.

        // We preserve this behavior for apps targeting old platform versions below.

        boolean useBrokenAddedCheck = false;

        Context context = getContext();

        if (mFragmentManager != null && mFragmentManager.mHost != null) {

            context = mFragmentManager.mHost.getContext();

        }

        if (context != null) {

            useBrokenAddedCheck = context.getApplicationInfo().targetSdkVersion <= VERSION_CODES.M;

        }

        final boolean performDeferredStart;

        if (useBrokenAddedCheck) {

            performDeferredStart = !mUserVisibleHint && isVisibleToUser && mState < STARTED

                    && mFragmentManager != null;

        } else {

            performDeferredStart = !mUserVisibleHint && isVisibleToUser && mState < STARTED

                    && mFragmentManager != null && isAdded();

        }

        if (performDeferredStart) {

            mFragmentManager.performPendingDeferredStart(this);

        }

        mUserVisibleHint = isVisibleToUser;

        mDeferStart = mState < STARTED && !isVisibleToUser;

    }