├── .gitignore ├── LICENSE ├── README.md ├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ └── main │ ├── AndroidManifest.xml │ ├── java │ └── com │ │ └── ysy │ │ └── smallapp │ │ ├── MainActivity.kt │ │ └── SmallActivity.java │ └── res │ ├── drawable-v24 │ └── ic_launcher_foreground.xml │ ├── drawable │ └── ic_launcher_background.xml │ ├── layout │ ├── activity_main.xml │ └── activity_small.xml │ ├── mipmap-anydpi-v26 │ ├── ic_launcher.xml │ └── ic_launcher_round.xml │ ├── mipmap-hdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ ├── mipmap-mdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ ├── mipmap-xhdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ ├── mipmap-xxhdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ ├── mipmap-xxxhdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ └── values │ ├── colors.xml │ ├── strings.xml │ └── styles.xml ├── build.gradle ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | local.properties 4 | .idea 5 | .DS_Store 6 | /build 7 | /captures 8 | .externalNativeBuild 9 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | A 5G switcher app for MIUI. 635 | Copyright (C) 2022 Sylvester Yao 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | FiveGSwitcher Copyright (C) 2022 Sylvester Yao 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ## 背景 2 | 之前面试一些校招同学，聊到微信小程序是什么launchMode，其任务栈是如何实现的？很多同学只提到singleInstance，这是不合适的。 3 | 4 | 今天我们就猜测并解析一下微信主程序与小程序的关系与大致实现，最后给出源码，可以给大家作一个简单参考。 5 | 6 | ## 初探 7 | 既然要研究微信，那么我们就先打开几个小程序，再用adb命令看看任务栈信息。 8 | 9 | 在终端使用 `adb shell dumpsys activity activities` 命令后，可以找到最近任务列表的Activity信息： 10 | ``` 11 | Running activities (most recent first): 12 | TaskRecord{caccd90 #3239 A=.AppBrandUI3 U=0 StackId=1 sz=1} 13 | Run #4: ActivityRecord{bb162b8 u0 com.tencent.mm/.plugin.appbrand.ui.AppBrandUI3 t3239} 14 | TaskRecord{d6c62d6 #3190 A=com.tencent.mm U=0 StackId=1 sz=1} 15 | Run #3: ActivityRecord{7f2d805 u0 com.tencent.mm/.ui.LauncherUI t3190} 16 | TaskRecord{34a386a #3238 A=.AppBrandUI2 U=0 StackId=1 sz=1} 17 | Run #2: ActivityRecord{16cfede u0 com.tencent.mm/.plugin.appbrand.ui.AppBrandUI2 t3238} 18 | TaskRecord{7ade2d1 #3237 A=.AppBrandUI U=0 StackId=1 sz=1} 19 | Run #1: ActivityRecord{ccfd8ae u0 com.tencent.mm/.plugin.appbrand.ui.AppBrandUI t3237} 20 | ... 21 | ``` 22 | 可以发现这里的#3是微信主Activity，4、2、1都是我开的小程序，且位于不同的任务栈中，Activity名称都是AppBrandUI+数字的形式。 23 | 24 | 然后再看看其他关键信息（这里我单独筛出来）： 25 | ``` 26 | packageName=com.tencent.mm processName=com.tencent.mm 27 | taskAffinity=com.tencent.mm 28 | 29 | packageName=com.tencent.mm processName=com.tencent.mm:appbrand3 30 | taskAffinity=.AppBrandUI3 31 | 32 | packageName=com.tencent.mm processName=com.tencent.mm:appbrand2 33 | taskAffinity=.AppBrandUI2 34 | 35 | packageName=com.tencent.mm processName=com.tencent.mm:appbrand 36 | taskAffinity=.AppBrandUI 37 | ``` 38 | 很简单，和我们平时实现多进程差不多，说明是给Activity设置了process属性。 39 | 40 | ## 思考 41 | 转念一想，小程序那么多，难道这些不同后缀的Activity都写死在代码里吗？ 42 | 43 | 显然不能这么干，只能两种途径可以达成目的： 44 | - 不在Manifest里面静态注册Activity，使用类似Hook的方式动态创建进程和Activity 45 | - 动静结合，设计一个Activity池，在本地写死有限数量的Activity，通过复用的方式承载小程序 46 | 47 | 对于第一种，我查阅了一些资料，理论上讲是可以做到的，涉及到NDK开发，需要我们对AMS的源码很熟悉，不走常规流程启动Activity，且小程序是多进程的，可能还需要手动fork进程。 48 | 49 | 这种方式显然具有较大的风险，属于黑科技范畴，而且谷歌官方是不推荐的，微信作为十几亿用户的常驻App，几乎不太可能使用这一方案。 50 | 51 | 那么只剩第二种了，预先在本地写死n个一样的Activity（当然也可以通过继承形式），同时在Manifest中注册好。 52 | 53 | 然后打开一个小程序就占用一个Activity，当打开第n+1个小程序时，覆盖第1个小程序所在的Activity，这样就相当于第1个小程序被顶掉了。 54 | 55 | 分析到此，就很明显了，如果真的是第二种方案，那么小程序就不能无限数量地打开咯？果断打开微信试了一下，果然，最多只能开5个！当你启动第6个小程序时，第1个就被销毁了。 56 | 57 | 其实这也是符合我们上述预期的，每个小程序的进程不一样，taskAffinity也不一样，类名也不一样。原生API是不支持动态设置taskAffinity和进程名的。 58 | 59 | ## 简单实现 60 | 小程序所在的Activity： 61 | ```java 62 | public class SmallActivity extends AppCompatActivity { 63 | 64 | public static class Small0 extends SmallActivity {} 65 | public static class Small1 extends SmallActivity {} 66 | public static class Small2 extends SmallActivity {} 67 | public static class Small3 extends SmallActivity {} 68 | public static class Small4 extends SmallActivity {} 69 | 70 | @Override 71 | protected void onCreate(@Nullable Bundle savedInstanceState) { 72 | super.onCreate(savedInstanceState); 73 | setContentView(R.layout.activity_small); 74 | 75 | // 动态地给小程序Activity设置名称和图标，下面代码只是举例，实际信息肯定是动态获取的 76 | // 由于iconRes这个构造参数的API 28才加入的，所以建议区分版本 77 | if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) { 78 | int iconRes = 0; // 这里应该是小程序图标的资源索引 79 | setTaskDescription(new ActivityManager.TaskDescription("小程序名", iconRes)); 80 | } else { 81 | Bitmap iconBmp = null; // 这里应该是小程序图标的bitmap 82 | setTaskDescription(new ActivityManager.TaskDescription("小程序名", iconBmp)); 83 | } 84 | } 85 | } 86 | ``` 87 | Manifest： 88 | ```xml 89 | 90 | 93 | 94 | 96 | 97 | 98 | 99 | 100 | 101 | 102 | 103 | 104 | 105 | 111 | 112 | 118 | 119 | 125 | 126 | 132 | 133 | 139 | 140 | 141 | 142 | 143 | ``` 144 | 具体的复用逻辑这里暂时就这样简单地实现了，实际情况肯定比此复杂： 145 | ```kotlin 146 | class MainActivity : AppCompatActivity() { 147 | 148 | override fun onCreate(savedInstanceState: Bundle?) { 149 | super.onCreate(savedInstanceState) 150 | setContentView(R.layout.activity_main) 151 | 152 | val edtText = findViewById(R.id.edt_main) 153 | 154 | findViewById(R.id.btn_main).setOnClickListener { 155 | startActivity(Intent().apply { 156 | val id = edtText.text.toString().toInt() % 5 157 | setClassName(this@MainActivity, "com.ysy.smallapp.SmallActivity\$Small$id") 158 | }) 159 | } 160 | } 161 | } 162 | ``` 163 | -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | apply plugin: 'kotlin-android' 3 | apply plugin: 'kotlin-android-extensions' 4 | 5 | android { 6 | compileSdkVersion 29 7 | 8 | defaultConfig { 9 | applicationId "com.ysy.smallapp" 10 | minSdkVersion 23 11 | targetSdkVersion 29 12 | versionCode 1 13 | versionName "1.0" 14 | } 15 | 16 | buildTypes { 17 | release { 18 | minifyEnabled false 19 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' 20 | } 21 | } 22 | } 23 | 24 | dependencies { 25 | implementation fileTree(dir: 'libs', include: ['*.jar']) 26 | implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version" 27 | implementation 'androidx.appcompat:appcompat:1.3.0-alpha01' 28 | implementation 'androidx.core:core-ktx:1.5.0-alpha01' 29 | implementation 'androidx.constraintlayout:constraintlayout:1.1.3' 30 | } 31 | -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # You can control the set of applied configuration files using the 3 | # proguardFiles setting in build.gradle. 4 | # 5 | # For more details, see 6 | # http://developer.android.com/guide/developing/tools/proguard.html 7 | 8 | # If your project uses WebView with JS, uncomment the following 9 | # and specify the fully qualified class name to the JavaScript interface 10 | # class: 11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 12 | # public *; 13 | #} 14 | 15 | # Uncomment this to preserve the line number information for 16 | # debugging stack traces. 17 | #-keepattributes SourceFile,LineNumberTable 18 | 19 | # If you keep the line number information, uncomment this to 20 | # hide the original source file name. 21 | #-renamesourcefileattribute SourceFile 22 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 6 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 29 | 30 | 36 | 37 | 43 | 44 | 50 | 51 | 57 | 58 | 59 | 60 | 61 | -------------------------------------------------------------------------------- /app/src/main/java/com/ysy/smallapp/MainActivity.kt: -------------------------------------------------------------------------------- 1 | package com.ysy.smallapp 2 | 3 | import android.content.Intent 4 | import android.os.Bundle 5 | import androidx.appcompat.app.AppCompatActivity 6 | import kotlinx.android.synthetic.main.activity_main.* 7 | 8 | class MainActivity : AppCompatActivity() { 9 | 10 | override fun onCreate(savedInstanceState: Bundle?) { 11 | super.onCreate(savedInstanceState) 12 | setContentView(R.layout.activity_main) 13 | 14 | btn_main.setOnClickListener { 15 | startActivity(Intent().apply { 16 | val id = edt_main.text.toString().toInt() % 5 17 | setClassName(this@MainActivity, "com.ysy.smallapp.SmallActivity\$Small$id") 18 | }) 19 | } 20 | } 21 | 22 | // 另一种方式，仅供参考 23 | fun startSmallAppAtNewTask() { 24 | startActivity(Intent().apply { 25 | setClassName(this@MainActivity, "com.xxx.xxx.XXXActivity") 26 | addFlags(Intent.FLAG_ACTIVITY_NEW_DOCUMENT and Intent.FLAG_ACTIVITY_MULTIPLE_TASK) 27 | }) 28 | } 29 | } 30 | -------------------------------------------------------------------------------- /app/src/main/java/com/ysy/smallapp/SmallActivity.java: -------------------------------------------------------------------------------- 1 | package com.ysy.smallapp; 2 | 3 | import android.app.ActivityManager; 4 | import android.graphics.Bitmap; 5 | import android.os.Build; 6 | import android.os.Bundle; 7 | 8 | import androidx.annotation.Nullable; 9 | import androidx.appcompat.app.AppCompatActivity; 10 | 11 | public class SmallActivity extends AppCompatActivity { 12 | 13 | public static class Small0 extends SmallActivity { 14 | } 15 | 16 | public static class Small1 extends SmallActivity { 17 | } 18 | 19 | public static class Small2 extends SmallActivity { 20 | } 21 | 22 | public static class Small3 extends SmallActivity { 23 | } 24 | 25 | public static class Small4 extends SmallActivity { 26 | } 27 | 28 | @Override 29 | protected void onCreate(@Nullable Bundle savedInstanceState) { 30 | super.onCreate(savedInstanceState); 31 | setContentView(R.layout.activity_small); 32 | 33 | // 方便示例小程序名 34 | String className = getClass().getSimpleName(); 35 | 36 | // 动态地给小程序Activity设置名称和图标，下面代码只是举例，实际信息肯定是动态获取的 37 | // 由于iconRes这个构造参数的API 28才加入的，所以建议区分版本 38 | if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) { 39 | int iconRes = 0; // 这里应该是小程序图标的资源索引 40 | setTaskDescription(new ActivityManager.TaskDescription(className, iconRes)); 41 | } else { 42 | Bitmap iconBmp = null; // 这里应该是小程序图标的bitmap 43 | setTaskDescription(new ActivityManager.TaskDescription(className, iconBmp)); 44 | } 45 | 46 | // 其他逻辑（如根据传过来的数据填充小程序对应的WebView组件等） 47 | // ... 48 | } 49 | } 50 | -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 12 | 13 | 19 | 22 | 25 | 26 | 27 | 28 | 34 | 35 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/ic_launcher_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 | 28 | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 | 48 | 50 | 52 | 54 | 56 | 58 | 60 | 62 | 64 | 66 | 68 | 70 | 72 | 74 | 75 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 6 | 7 | 13 | 14 |