1 /* 2 * Copyright (C) 2020 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.launcher3.util; 17 18 import android.os.Looper; 19 20 import androidx.annotation.WorkerThread; 21 22 /** 23 * Utility class to define an object which does most of it's processing on a 24 * dedicated background thread. 25 */ 26 public abstract class BgObjectWithLooper { 27 28 /** 29 * Start initialization of the object 30 */ initializeInBackground(String threadName)31 public final void initializeInBackground(String threadName) { 32 new Thread(this::runOnThread, threadName).start(); 33 } 34 runOnThread()35 private void runOnThread() { 36 Looper.prepare(); 37 onInitialized(Looper.myLooper()); 38 Looper.loop(); 39 } 40 41 /** 42 * Called on the background thread to handle initialization 43 */ 44 @WorkerThread onInitialized(Looper looper)45 protected abstract void onInitialized(Looper looper); 46 } 47