base: don't refresh visualizer tile once the tile is destroyed

package com.android.systemui.qs.tiles;

import android.annotation.NonNull;

import android.annotation.Nullable;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.graphics.Paint;

import android.graphics.Rect;

import android.media.audiofx.AudioEffect;

import android.media.session.MediaController;

import android.media.session.MediaSession;

import android.media.session.MediaSessionManager;

import android.media.session.PlaybackState;

import android.os.AsyncTask;

import android.os.PowerManager;

import android.view.Gravity;

import com.pheelicks.visualizer.VisualizerView;

import com.pheelicks.visualizer.renderer.Renderer;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

public class VisualizerTile extends QSTile<QSTile.State> implements KeyguardMonitor.Callback {

    private static final Intent AUDIO_EFFECTS =

    private MediaMonitor mMediaMonitor;

    private boolean mDestroyed;

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {

        @Override

        public void onReceive(Context context, Intent intent) {

        state.contentDescription = mContext.getString(

                R.string.accessibility_quick_settings_visualizer);

        if (!mDestroyed) {

            mUiHandler.post(mUpdateVisibilities);

        }

    }

    @Override

    public void setListening(boolean listening) {

    @Override

    protected void handleDestroy() {

        mDestroyed = true;

        mMediaMonitor.setListening(false);

        mMediaMonitor = null;

        super.handleDestroy();

    private final Runnable mUpdateVisibilities = new Runnable() {

        @Override

        public void run() {

            boolean showVz = mMediaMonitor.isAnythingPlaying() && !mKeyguardMonitor.isShowing();

            boolean showVz = mMediaMonitor != null

                    && mMediaMonitor.isAnythingPlaying()

                    && !mKeyguardMonitor.isShowing();

            mVisualizer.animate().cancel();

            mVisualizer.animate()

                    .setDuration(200)