preface

The previous refactoring of legacy mobile applications (13) -MVP Refactoring example explained how the file module team refactored the file home page to the MVP architecture, adding automated testing. After refactoring, the team’s development efficiency and release quality improved significantly. The business of dynamic modules is more complex than file modules, and this time the team decided to use the new development language Kotlin and the MVVM architecture.

In this article, we will continue to show you how to transition from Java code to Kotlin code, and how to refactor god classes into MVVM architecture step by step, using DynamicBundle as an example.

Video presentation address: mp.weixin.qq.com/s/vex4Kn6Ts…

The refactoring process

Recalling the refactoring process we analyzed in the last article, we recommend that you also go to Step 3 to convert to Kotlin, with guardian tests in place, as it is safer. The process is as follows:

Graph TD A(1. Combing business logic)-->B(2. Analyzing original code design) B-->C(3. Supplementary guardian test) C-->D(4. Simple design) D-->E(5. E-->F(6. Integration Acceptance Test)

1. Sort out the service logic

As mentioned in the last article, we can try to complete the information from the following aspects.

Find someone: product manager, designer, tester to confirm and answer questions
Find documentation: View existing requirements documents, design documents, test cases, design sketches
Look at the code: Sort out the business from the original code design

After sorting and confirming, the existing services of FileBundle are as follows:

Graph of TD (into the dynamic page) - - > B (dynamic list data to be loaded from the network) - > B C {data is loaded successfully} C - > load success | | D (display dynamic list - content and date) C - > | network abnormal | E} {whether there is A local cache data C - > | | data is empty F (shows the empty data) E - > | | existence cache data D E - > | | G (display NetworkErrorException) there is no cache data F - > | click trigger refresh | G - B > | B | click trigger refreshing

The time is displayed in YYYY-MM-DD HH: MM :ss

2. Analyze the original code design

Let’s take the main DynamicFragment class as an example.

@Route(path = "/dynamicBundle/dynamic") @AndroidEntryPoint public class DynamicFragment extends Fragment { @Inject DynamicController dynamicController; Button btnUpload; @Inject TransferFile transferFile; private RecyclerView dynamicListRecycleView; private TextView tvMessage; public static DynamicFragment newInstance() { DynamicFragment fragment = new DynamicFragment(); Bundle args = new Bundle(); fragment.setArguments(args); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_dynamic, container, false); btnUpload = view.findViewById(R.id.btn_upload); btnUpload.setOnClickListener(v -> uploadDynamic()); dynamicListRecycleView = view.findViewById(R.id.file_list); tvMessage = view.findViewById(R.id.tv_message); tvMessage.setOnClickListener(v -> getDynamicList()); getDynamicList(); return view; } public void uploadDynamic() {FileInfo FileInfo = transferfile.upload ("/data/data/user.png"); Dynamiccontroller.post (new Dynamic(0, "first Dynamic ", system.currentTimemillis ()), fileInfo); } public void getDynamicList() { new Thread(() -> { Message message = new Message(); try { List<Dynamic> dynamicList = dynamicController.getDynamicList(); message.what = 1; message.obj = dynamicList; } catch (NetworkErrorException e) { message.what = 0; message.obj = "NetworkErrorException"; e.printStackTrace(); } mHandler.sendMessage(message); }).start(); } public Handler mHandler = new Handler(new Handler.Callback() { @Override public boolean handleMessage(@NonNull Message  msg) { if (msg.what == 1) { showTip(false); List<Dynamic> dynamicList = (List<Dynamic>) msg.obj; if (dynamicList == null || dynamicList.size() == 0) { showTip(true); // Display empty data tvmessage.settext ("empty data"); } else { DynamicListAdapter fileListAdapter = new DynamicListAdapter(dynamicList, getActivity()); dynamicListRecycleView.addItemDecoration(new DividerItemDecoration( getActivity(), DividerItemDecoration.VERTICAL)); / / set the display format layout dynamicListRecycleView. SetLayoutManager (new LinearLayoutManager (getActivity ())); dynamicListRecycleView.setAdapter(fileListAdapter); / / updates to the data from network. Keep to cache dynamicController saveDynamicToCache (dynamicList); }} else if (MSG. What = = 0) {/ / try to read the data from the cache List < Dynamic > dynamicList = dynamicController. GetDynamicListFromCache (); if (dynamicList == null || dynamicList.size() == 0) { showTip(true); // Display the exception alert data tvmessage.settext (MSG.obj.toString()); } else { DynamicListAdapter fileListAdapter = new DynamicListAdapter(dynamicList, getActivity()); dynamicListRecycleView.addItemDecoration(new DividerItemDecoration( getActivity(), DividerItemDecoration.VERTICAL)); / / set the display format layout dynamicListRecycleView. SetLayoutManager (new LinearLayoutManager (getActivity ())); dynamicListRecycleView.setAdapter(fileListAdapter); } } return false; }}); public void showTip(boolean show) { if (show) { tvMessage.setVisibility(View.VISIBLE); dynamicListRecycleView.setVisibility(View.GONE); } else { tvMessage.setVisibility(View.GONE); dynamicListRecycleView.setVisibility(View.VISIBLE); }}}Copy the code

From the code we can see some of the major design issues as follows:

The main fetching dynamic list, exception logic judgment, data cache judgment and interface refresh control are all in one class, which is not good for subsequent expansion and modification maintenance. We want the responsibility of the class to be more singular, with logic and view separated.
There are rough new threads to manage
Handler may cause memory leaks
Duplicate code exists, such as the presentation of tabular data
There are no guardian tests in the code

See Github for the full code

3. Supplementary guard tests

Referring to the strategy we laid out in refactoring, we can do the big tests first as guardian tests. We also mock database and network-related operations. Test cases mainly contain the main business logic that has been sorted out, including normal data display, network exception cache data, network exception no cache data, and empty data. The code is as follows:

@RunWith(AndroidJUnit4::class) @LargeTest @HiltAndroidTest @Config(application = HiltTestApplication::class, shadows = [ShadowDynamicFragment::class, ShadowDynamicController::class]) class DynamicFragmentTest { @get:Rule var hiltRule = HiltAndroidRule(this) @Test fun `show show dynamic list when get success`() { //given ShadowDynamicFragment.state = ShadowDynamicFragment.State.SUCCESS //when val scenario: ActivityScenario<DebugActivity> = ActivityScenario.launch(DebugActivity::class.java) scenario.onActivity { //then "What a beautiful day!" )).check(matches(isDisplayed())) onView(withText("2021-03-17 14:47:55")).check(matches(isDisplayed())) This series is worth watching! )).check(matches(isDisplayed())) onView(withText("2021-03-17 14:48:08")).check(matches(isDisplayed())) } } @Test fun `show show dynamic list when net work exception but have cache`() { //given ShadowDynamicFragment.state = ShadowDynamicFragment.State.ERROR ShadowDynamicController.state = ShadowDynamicController.State.DATA //when val scenario: ActivityScenario<DebugActivity> = ActivityScenario.launch(DebugActivity::class.java) scenario.onActivity { //then "What a beautiful day!" )).check(matches(isDisplayed())) onView(withText("2021-03-17 14:47:55")).check(matches(isDisplayed())) This series is worth watching! )).check(matches(isDisplayed())) onView(withText("2021-03-17 14:48:08")).check(matches(isDisplayed())) } } @Test fun `show show error tip when net work exception and not have cache`() { //given ShadowDynamicFragment.state = ShadowDynamicFragment.State.ERROR ShadowDynamicController.state = ShadowDynamicController.State.EMPTY //when val scenario: ActivityScenario<DebugActivity> = ActivityScenario.launch(DebugActivity::class.java) scenario.onActivity { //then onView(withText("NetworkErrorException")).check(matches(isDisplayed())) } } @Test fun `show show empty tip when not has data`() { //given ShadowDynamicFragment.state = ShadowDynamicFragment.State.EMPTY //when val scenario: ActivityScenario<DebugActivity> = ActivityScenario.launch(DebugActivity::class.java) scenario.onActivity { //then onView(withText("empty data")).check(matches(isDisplayed())) } } }Copy the code

Finally, we completed the basic daemon test, and the running result is as follows:

See Github for the full code

Kotlin

Kotlin is mixed with Java support, so we can write new code in Kotlin. Take a look at Java interoperability on the Kotlin website
AndroidStudio supports converting existing Java code into Kotlin code

AndroidStudio support will view Kotlin bytecode, Decompile for Java code, easy to understand some syntax features

The Dynamic module team members decided to use solution 2 to convert the Dynamic home page to Kotlin code.

In the conversion process, try to convert one relatively cohesive package at a time, convert in small steps and test and verify, and Review and adjust manually after the conversion

After conversion, the current DynamicFragment code is as follows:

@Route(path = "/dynamicBundle/dynamic") @AndroidEntryPoint class DynamicFragment : Fragment() { @Inject lateinit var dynamicController: DynamicController @Inject lateinit var transferFile: TransferFile private lateinit var btnUpload: Button private lateinit var dynamicListRecycleView: RecyclerView private lateinit var tvMessage: TextView override fun onCreateView(inflater: LayoutInflater, container: ViewGroup? , savedInstanceState: Bundle?) : View? { val view = inflater.inflate(R.layout.fragment_dynamic, container, false) btnUpload = view.findViewById(R.id.btn_upload) btnUpload.setOnClickListener { uploadDynamic() } dynamicListRecycleView = view.findViewById(R.id.file_list) tvMessage = view.findViewById(R.id.tv_message) TvMessage. SetOnClickListener {getDynamicList ()} getDynamicList () return the view} private fun uploadDynamic () {/ / upload file Val fileInfo = transferfile.upload ("/data/data/user.png") fileInfo?.let {dynamiccontroller.post (Dynamic(0, "first Dynamic "), System.currentTimeMillis()), it) } } public fun getDynamicList() { Thread { val message = Message() val dynamicList = dynamicController.getDynamicList() message.what = 1 message.obj = dynamicList mHandler.sendMessage(message) }.start() } Var mHandler = Handler {MSG -> if (MSG. What == 1) {showTip(false) var dynamicList = mutableListOf<Dynamic>() Let {dynamicList = MSG. Obj as MutableList<Dynamic>} if (dynamicList.isempty ()) {showTip(true) // Display empty data tvMessage.text = "empty data" } else { val fileListAdapter = activity?.let { DynamicListAdapter(dynamicList, it) } dynamicListRecycleView.addItemDecoration(DividerItemDecoration( activity, DividerItemDecoration. VERTICAL)) / / set the display format layout dynamicListRecycleView. LayoutManager = LinearLayoutManager (activity) DynamicListRecycleView. Adapter = fileListAdapter / / updates to the data from the network maintain to cache dynamicController.. saveDynamicToCache (dynamicList)} } else if (MSG. What = = 0) {/ / try to read the data from the cache val dynamicList = dynamicController. GetDynamicListFromCache the if () (dynamicList.isEmpty()) {showTip(true) // Display the exception notification data tvmessage.text = MSG.obj.toString()} else {val fileListAdapter = activity?.let { DynamicListAdapter(dynamicList, it) } dynamicListRecycleView.addItemDecoration(DividerItemDecoration( activity, DividerItemDecoration. VERTICAL)) / / set the display format layout dynamicListRecycleView. LayoutManager = LinearLayoutManager (activity) dynamicListRecycleView.adapter = fileListAdapter } } false } fun showTip(show: Boolean) { if (show) { tvMessage.visibility = View.VISIBLE dynamicListRecycleView.visibility = View.GONE } else { tvMessage.visibility = View.GONE dynamicListRecycleView.visibility = View.VISIBLE } } companion object { fun newInstance(): DynamicFragment { val fragment = DynamicFragment() val args = Bundle() fragment.arguments = args return fragment } } }Copy the code

4. Simple design

The MVVM architecture

graph TD
B(MVVM)-->A(Model)
B-->|bingding|C(View)
C-->|bingding|B
Copy the code

Separation of business logic and view
A ViewModel is bound to a View using a binding, so you don’t have to define a lot of interfaces
In order to manage threads more efficiently, the team decided to use coroutine for unified thread management. The architecture style is referred to architecture-samples

LiveData data design

Val dynamicListLiveData: LiveData<List<Dynamic>>Copy the code

Related third-party libraries

Implementation 'androidx. Core: the core - KTX: 1.3.2' implementation 'androidx. Lifecycle: lifecycle - livedata - KTX: 2.3.0' Implementation 'androidx. Lifecycle: lifecycle - viewmodel - KTX: 2.3.0' implementation 'org. Jetbrains. Kotlinx: kotlinx coroutines -- core: 1.4.1' implementation 'org. Jetbrains. Kotlinx: kotlinx coroutines - android: 1.4.1'Copy the code

5. Perform security reconstruction in small steps

Extract the business logic of DynamicFragment to DynamicViewModel
Define bindings for LiveData and XML
Extracting DymaicRepository
Extract DataSource interface

Refactoring techniques include extracting interfaces, moving methods, moving classes, extracting methods, inlining, extracting variables, and so on. The Kotlin IDE currently does not support moving methods to classes

See the video for a detailed demonstration

See Github for the detailed code

Supplement test cases

Added DateUtil calculate date test

@SmallTest class DateUtilTest { @Test fun `should return 2021-03-17 14 47 5 when input is 1615963675000L`() { val format  = DateUtil.getDateToString(1615963675000L) Assert.assertEquals("2021-03-17 14:47:55", format) } }Copy the code

Added MVVM service logic tests

@ExperimentalCoroutinesApi @SmallTest class DynamicViewModelTest { private val testDispatcher = TestCoroutineDispatcher() @get:Rule val rule = InstantTaskExecutorRule() @Before fun setUp() { Dispatchers.setMain(testDispatcher) } @After fun tearDown() { Dispatchers.resetMain() testDispatcher.cleanupTestCoroutines() } @Test fun `show show dynamic list when get success`() = runBlocking { //given val mockTransferFile = mock(TransferFile::class.java) val mockDynamicRepository = mock(DynamicRepository::class.java) `when`(mockDynamicRepository.getDynamicList()).thenReturn(getMockData()) val dynamicViewModel = DynamicViewModel(mockTransferFile, mockDynamicRepository) //when dynamicViewModel.getDynamicList() //then val dynamicOne = LiveDataTestUtil.getValue(dynamicViewModel.dynamicListLiveData)[0] assertThat(dynamicOne.id).isEqualTo(1) AssertThat (dynamicone.content). IsEqualTo (" What a beautiful day!" ) assertThat(dynamicOne.date).isEqualTo(1615963675000L) val dynamicTwo = LiveDataTestUtil.getValue(dynamicViewModel.dynamicListLiveData)[1] assertThat(dynamicTwo.id).isEqualTo(2) AssertThat (dynamictwo-content). IsEqualTo (" This series is worth following! ") ) assertThat(dynamicTwo.date).isEqualTo(1615963688000L) } @Test fun `show show dynamic list when net work exception but have cache`() = runBlocking { //given val mockTransferFile = mock(TransferFile::class.java) val mockDynamicRepository = mock(DynamicRepository::class.java) `when`(mockDynamicRepository.getDynamicList()).thenThrow(NetWorkErrorException::class.java) `when`(mockDynamicRepository.getDynamicListFromCache()).thenReturn(getMockData()) val dynamicViewModel = DynamicViewModel(mockTransferFile, mockDynamicRepository) //when dynamicViewModel.getDynamicList() //then val dynamicOne = LiveDataTestUtil.getValue(dynamicViewModel.dynamicListLiveData)[0] assertThat(dynamicOne.id).isEqualTo(1) AssertThat (dynamicone.content). IsEqualTo (" What a beautiful day!" ) assertThat(dynamicOne.date).isEqualTo(1615963675000L) val dynamicTwo = LiveDataTestUtil.getValue(dynamicViewModel.dynamicListLiveData)[1] assertThat(dynamicTwo.id).isEqualTo(2) AssertThat (dynamictwo-content). IsEqualTo (" This series is worth following! ") ) assertThat(dynamicTwo.date).isEqualTo(1615963688000L) } @Test fun `show show error tip when net work exception and not  have cache`() = runBlocking { //given val mockTransferFile = mock(TransferFile::class.java) val mockDynamicRepository =  mock(DynamicRepository::class.java) `when`(mockDynamicRepository.getDynamicList()).thenThrow(NetWorkErrorException::class.java) val dynamicViewModel = DynamicViewModel(mockTransferFile, mockDynamicRepository) //when dynamicViewModel.getDynamicList() //then val errorMessage = LiveDataTestUtil.getValue(dynamicViewModel.errorMessageLiveData) assertThat(errorMessage).isEqualTo("NetWorkErrorException") val dynamicList = LiveDataTestUtil.getValue(dynamicViewModel.dynamicListLiveData) assertThat(dynamicList).isNull() } @Test fun `show show empty tip when not has data`() = runBlocking { //given val mockTransferFile = mock(TransferFile::class.java) val mockDynamicRepository = mock(DynamicRepository::class.java) `when`(mockDynamicRepository.getDynamicList()).thenReturn(null) val dynamicViewModel = DynamicViewModel(mockTransferFile, mockDynamicRepository) //when dynamicViewModel.getDynamicList() //then val dynamicList = LiveDataTestUtil.getValue(dynamicViewModel.dynamicListLiveData) assertThat(dynamicList).isNull() } private fun GetMockData (): ArrayList<Dynamic> {val dynamicList = ArrayList<Dynamic>() dynamiclist.add (Dynamic(1, "What a nice day!" , 1615963675000L)) dynamiclist.add (2, "This series is worth following!" , 1615963688000L)) return dynamicList } }Copy the code

Dynamic Bundle all tests are reported as follows:

DataBinging

Fragment modification is as follows:

@Route(path = "/dynamicBundle/dynamic") @AndroidEntryPoint class DynamicFragment : Fragment() { private lateinit var binding: FragmentDynamicBinding private val dynamicViewModel: DynamicViewModel by viewModels() override fun onCreateView(inflater: LayoutInflater, container: ViewGroup? , savedInstanceState: Bundle?) : View? { binding = FragmentDynamicBinding.inflate(inflater, container, false) binding.btnUpload.setOnClickListener { dynamicViewModel.uploadDynamic() } binding.tvMessage.setOnClickListener { dynamicViewModel.getDynamicList() } dynamicViewModel.getDynamicList() subscribeUi() return binding.root } private fun subscribeUi() { dynamicViewModel.dynamicListLiveData.observe(viewLifecycleOwner, { if (it.isNullOrEmpty()) { showEmptyData() } else { showDynamicList(it) } }) dynamicViewModel.errorMessageLiveData.observe(viewLifecycleOwner, { showErrorMessage(it) }) } private fun showErrorMessage(errorMessage: String) {binding. ShowTip = true // Display exception notification data binding. Tvmessage. text = errorMessage} private fun showDynamicList(dynamicList: List<Dynamic>) { binding.showTip = false val dynamicListAdapter = DynamicListAdapter() dynamicListAdapter.submitList(dynamicList) binding.dynamicList.addItemDecoration(DividerItemDecoration( activity, DividerItemDecoration. VERTICAL)) / / set the display format layout binding. DynamicList. LayoutManager = LinearLayoutManager (activity) Binding. DynamicList. Adapter = dynamicListAdapter} private fun showEmptyData () {binding. ShowTip = true / / show the empty data binding.tvMessage.text = "empty data" } companion object { fun newInstance(): DynamicFragment { val fragment = DynamicFragment() val args = Bundle() fragment.arguments = args return fragment } } } <? The XML version = "1.0" encoding = "utf-8"? > <layout xmlns:android="http://schemas.android.com/apk/res/android"> <data> <import type="android.view.View" /> <variable name="showTip" type="boolean" /> </data> <FrameLayout android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/tv_message" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:text="" android:visibility="@{showTip ? View.VISIBLE:View.GONE}" /> <androidx.recyclerview.widget.RecyclerView android:id="@+id/dynamicList" android:layout_width="match_parent" android:layout_height="match_parent" android:visibility="@{showTip ? View.GONE:View.VISIBLE}" /> <Button android:id="@+id/btn_upload" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="right|bottom" android:layout_margin="10dp" android:text="upload" /> </FrameLayout> </layout>Copy the code

Adapter modification is as follows:

class DynamicListAdapter() : ListAdapter<Dynamic, DynamicListAdapter.DynamicVH>(DynamicDiffCallback()) {

   override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DynamicVH {
       return DynamicVH(DataBindingUtil.inflate(LayoutInflater.from(parent.context), R.layout.dynamic_list_item, parent, false))
   }

   override fun onBindViewHolder(holder: DynamicVH, position: Int) {
       holder.binding.dynamic = getItem(position)
       holder.binding.executePendingBindings()
   }

   class DynamicVH(val binding: DynamicListItemBinding) : RecyclerView.ViewHolder(binding.root)

   private class DynamicDiffCallback : DiffUtil.ItemCallback<Dynamic>() {
       override fun areItemsTheSame(oldItem: Dynamic, newItem: Dynamic): Boolean {
           return oldItem.id == newItem.id
       }

       override fun areContentsTheSame(oldItem: Dynamic, newItem: Dynamic): Boolean {
           return oldItem == newItem
       }
   }
}
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">

   <data>

       <import type="android.view.View" />

       <variable
           name="dynamic"
           type="com.cloud.disk.bundle.dynamic.Dynamic" />
   </data>

   <FrameLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:orientation="horizontal"
       android:padding="10dp">

       <TextView
           android:id="@+id/tv_content"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_gravity="left"
           android:text="@{dynamic.content}" />

       <TextView
           android:id="@+id/tv_date"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_gravity="right"
           android:text="@{dynamic.formatDate}" />
   </FrameLayout>

</layout>
Copy the code

See Github for the detailed code

6. Integration acceptance test

The Dynamic Bundle module released version 1.0.1

Implementation 'com. Cloud. Disk. Bundle: dynamic: 1.0.1'Copy the code

The injection issue was modified in other modules

Implementation 'com. Cloud. Disk. Bundle: file: 1.0.2' implementation 'com. Cloud. Disk. Bundle: user: 1.0.1'Copy the code

Running a daemon test

We found an exception in the file generated for binding

Field <com.cloud.dynamicbundle.databinding.DynamicListItemBinding.mDynamic> has type <com.cloud.disk.bundle.dynamic.Dynamic> in (DynamicListItemBinding.java:0)
Method <com.cloud.dynamicbundle.databinding.DynamicListItemBinding.getDynamic()> has return type <com.cloud.disk.bundle.dynamic.Dynamic> in (DynamicListItemBinding.java:0)
Method <com.cloud.dynamicbundle.databinding.DynamicListItemBinding.setDynamic(com.cloud.disk.bundle.dynamic.Dynamic)> has parameter of type <com.cloud.disk.bundle.dynamic.Dynamic> in (DynamicListItemBinding.java:0)

Copy the code

Adding filtering Rules

.*com.cloud.*.databinding.*ItemBinding.*
Copy the code

Run to check

conclusion

This article describes how the Dynamic module team switched the dynamic widget home page to Kotlin code, refactored it to the MVVM architecture, and added automated testing. After refactoring, the team’s development efficiency and release quality improved significantly. However, local database management is still a lot of SQL statement spelling, very difficult to extend and maintain, and writing automated tests is very difficult.

Next, Mobile Application legacy System Refactoring (15) – Sample database refactoring. We will continue to restructure the database.

CloudDisk example code

CloudDisk

Series of links

Refactoring legacy Systems for mobile Applications (1) – Start

Refactoring legacy systems for mobile applications (2) – Architecture

Refactoring legacy systems for mobile applications (3) – Examples

Refactoring legacy Systems in Mobile Applications (4) – Analysis

Mobile application legacy System refactoring (5) – Refactoring methods

Refactoring legacy Systems for mobile applications (6) – Test

Mobile application legacy System refactoring (7) – Decoupled refactoring Demonstration (1)+ video demonstration

Refactoring legacy Systems for mobile applications (8) – Dependency Injection

Refactoring legacy systems for mobile applications (9) – Routing

Refactoring legacy Systems in Mobile applications (10) — Decoupled Refactoring (2)

Refactoring legacy systems for mobile applications (11) – Product management

Refactoring legacy mobile applications (12) – Compile the debug

Refactoring legacy mobile applications (13) – Compile the debugger

The outline

about

Author: Huang Junbin
Blog: junbin. Tech
GitHub: junbin1011
Zhihu: @ JunBin

mo4tech.com (Moment For Technology) is a global community with thousands techies from across the global hang out!Passionate technologists, be it gadget freaks, tech enthusiasts, coders, technopreneurs, or CIOs, you would find them all here.

Mobile Application Legacy System Reconfiguration (14) – 🔥🔥🔥 Video teaching! Kotlin + MVVM refactoring

preface

The refactoring process

1. Sort out the service logic

2. Analyze the original code design

3. Supplementary guard tests

Kotlin

4. Simple design

The MVVM architecture

LiveData data design

Related third-party libraries

5. Perform security reconstruction in small steps

Supplement test cases

DataBinging

6. Integration acceptance test

conclusion

CloudDisk example code

Series of links

The outline

about

Mobile Application Legacy System Reconfiguration (14) – 🔥🔥🔥 Video teaching! Kotlin + MVVM refactoring

preface

The refactoring process

1. Sort out the service logic

2. Analyze the original code design

3. Supplementary guard tests

Kotlin

4. Simple design

The MVVM architecture

LiveData data design

Related third-party libraries

5. Perform security reconstruction in small steps

Supplement test cases

DataBinging

6. Integration acceptance test

conclusion

CloudDisk example code

Series of links

The outline

about

Related Posts

Android Dagger2 base 1 (@inject, @Component, @Module & @Provider)

How do Android developers write server-side code

What? You can’t use Kotlin yet? Get in the car!