1. Background
At that time, I encountered customization requirements and removed the Device is starting displayed when I first turned it on.
2. Preparation
First confirm which module it is in. At that time, the first reaction was the launcher, but after a search, I couldn't find it. Here is a special explanation of this transparent interface called FallbackHome in Settings.
Paste the corresponding code below, you can take a look at the implementation of
packages\apps\Settings\src\com\android\settings\FallbackHome.java
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under