Merge "Add user-switching observer to AttentionDetector" into qt-dev

import static android.provider.Settings.System.ADAPTIVE_SLEEP;

import android.Manifest;

import android.app.ActivityManager;

import android.app.SynchronousUserSwitchObserver;

import android.attention.AttentionManagerInternal;

import android.attention.AttentionManagerInternal.AttentionCallbackInternal;

import android.content.ContentResolver;

import android.os.Handler;

import android.os.PowerManager;

import android.os.PowerManagerInternal;

import android.os.RemoteException;

import android.os.SystemClock;

import android.os.UserHandle;

import android.provider.Settings;

    private static final String TAG = "AttentionDetector";

    private static final boolean DEBUG = false;

    private Context mContext;

    private boolean mIsSettingEnabled;

    /**

    }

    public void systemReady(Context context) {

        mContext = context;

        updateEnabledFromSettings(context);

        mPackageManager = context.getPackageManager();

        mContentResolver = context.getContentResolver();

        mMaxAttentionApiTimeoutMillis = context.getResources().getInteger(

                com.android.internal.R.integer.config_attentionApiTimeout);

        try {

            final UserSwitchObserver observer = new UserSwitchObserver();

            ActivityManager.getService().registerUserSwitchObserver(observer, TAG);

        } catch (RemoteException e) {

             // Shouldn't happen since in-process.

        }

        context.getContentResolver().registerContentObserver(Settings.System.getUriFor(

                Settings.System.ADAPTIVE_SLEEP),

                false, new ContentObserver(new Handler()) {

            mRequested.set(false);

        }

    }

    private final class UserSwitchObserver extends SynchronousUserSwitchObserver {

        @Override

        public void onUserSwitching(int newUserId) throws RemoteException {

            updateEnabledFromSettings(mContext);

        }

    }

}