1.概述
在12.0的系统rom开发中，预安装的方法来安装这个app.然后在Launcher3 拖拽卸载时，不让他卸载接下来就看Launcher3 app 长按卸载的流程
在luncher.xml中文章来源：https://www.toymoban.com/news/detail-469337.html
<include
android:id="@+id/drop_target_bar"
layout="@layout/drop_target_bar" />drop_targe_bar.xml文章来源地址https://www.toymoban.com/news/detail-469337.html
<?xml version="1.0" encoding="utf-8"?><!--
Copyright (C) 2018 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.
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