Using a separate thread for logging

package com.android.launcher3.logging;

import android.os.Handler;

import android.os.HandlerThread;

import android.os.Message;

import android.util.Log;

import android.util.Pair;

/**

 * Wrapper around {@link Log} to allow writing to a file.

 * This class can safely be called from main thread.

 *

 * Note: This should only be used for logging errors which have a persistent effect on user's data,

 * but whose effect may not be visible immediately.

 */

public final class FileLog {

    private static Handler getHandler() {

        synchronized (DATE_FORMAT) {

            if (sHandler == null) {

                // We can use any non-ui looper, but why create another just for logging!

                sHandler = new Handler(LauncherModel.getWorkerLooper(), new LogWriterCallback());

                HandlerThread thread = new HandlerThread("file-logger");

                thread.start();

                sHandler = new Handler(thread.getLooper(), new LogWriterCallback());

            }

        }

        return sHandler;