增加离线地图下载流程

app/src/main/java/com/navinfo/omqs/ui/fragment/offlinemap/OfflineMapAdapter.kt

@@ -3,6 +3,7 @@ package com.navinfo.omqs.ui.fragment.offlinemap
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentActivity
 import androidx.viewpager2.adapter.FragmentStateAdapter
+import dagger.hilt.EntryPoint
 
 /**
  * 离线地图主页面，viewpage适配器

app/src/main/java/com/navinfo/omqs/ui/fragment/offlinemap/OfflineMapCityListAdapter.kt

@@ -1,33 +1,118 @@
 package com.navinfo.omqs.ui.fragment.offlinemap
 
-import androidx.databinding.ViewDataBinding
+import android.content.Context
+import android.util.Log
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.lifecycle.Observer
 import com.navinfo.omqs.R
-import com.navinfo.omqs.BR
 import com.navinfo.omqs.bean.OfflineMapCityBean
 import com.navinfo.omqs.databinding.AdapterOfflineMapCityBinding
+import com.navinfo.omqs.http.offlinemapdownload.OfflineMapDownloadManager
 import com.navinfo.omqs.ui.other.BaseRecyclerViewAdapter
 import com.navinfo.omqs.ui.other.BaseViewHolder
 import javax.inject.Inject
 
 /**
  * 离线地图城市列表 RecyclerView 适配器
+ *
+ * 在 RecycleView 的 ViewHolder 中监听 ViewModel 的 LiveData，然后此时传递的 lifecycleOwner 是对应的 Fragment。由于 ViewHolder 的生命周期是比 Fragment 短的，所以当 ViewHolder 销毁时，由于 Fragment 的 Lifecycle 还没有结束，此时 ViewHolder 会发生内存泄露（监听的 LiveData 没有解绑）
+ *   这种场景下有两种解决办法：
+ *使用 LiveData 的 observeForever 然后在 ViewHolder 销毁前手动调用 removeObserver
+ *使用 LifecycleRegistry 给 ViewHolder 分发生命周期(这里使用了这个)
  */
+class OfflineMapCityListAdapter @Inject constructor(
+    private val downloadManager: OfflineMapDownloadManager, private val context: Context
+) : BaseRecyclerViewAdapter<OfflineMapCityBean>() {
 
-class OfflineMapCityListAdapter @Inject constructor() :
-    BaseRecyclerViewAdapter<OfflineMapCityBean>() {
-    override fun onBindViewHolder(holder: BaseViewHolder, position: Int) {
-        var binding: ViewDataBinding = holder.dataBinding
-        //立刻刷新UI，解决闪烁
-//        binding.executePendingBindings()
-        binding.setVariable(BR.cityBean, data[position])
-        (binding as AdapterOfflineMapCityBinding).offlineMapDownloadBtn.setOnClickListener {
 
+    private val downloadBtnClick = View.OnClickListener() {
+        if (it.tag != null) {
+            val cityBean = data[it.tag as Int]
+            when (cityBean.status) {
+                OfflineMapCityBean.NONE, OfflineMapCityBean.UPDATE, OfflineMapCityBean.PAUSE, OfflineMapCityBean.ERROR -> {
+                    downloadManager.start(cityBean.id)
+                }
+                OfflineMapCityBean.LOADING, OfflineMapCityBean.WAITING -> {
+                    downloadManager.pause(cityBean.id)
+                }
+//                OfflineMapCityBean.WAITING->{
+//                    downloadManager.cancel(cityBean.id)
+//                }
+            }
         }
+    }
 
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BaseViewHolder {
+        val viewBinding =
+            AdapterOfflineMapCityBinding.inflate(LayoutInflater.from(parent.context), parent, false)
+        return BaseViewHolder(viewBinding)
+    }
+
+    override fun onBindViewHolder(holder: BaseViewHolder, position: Int) {
+        val binding: AdapterOfflineMapCityBinding =
+            holder.viewBinding as AdapterOfflineMapCityBinding
+        //牺牲性能立刻刷新UI，解决闪烁 这里不用
+//        binding.executePendingBindings()
+        val cityBean = data[position]
+        binding.offlineMapDownloadBtn.tag = position
+        binding.offlineMapDownloadBtn.setOnClickListener(downloadBtnClick)
+        binding.offlineMapCityName.text = cityBean.name
+        binding.offlineMapCitySize.text = cityBean.getFileSizeText()
+        downloadManager.addTask(cityBean)
+        changeViews(binding, cityBean)
+        downloadManager.observer(cityBean.id, holder) {
+            if (cityBean.id == it.id)
+                changeViews(binding, it)
+        }
+    }
+
+    private fun changeViews(binding: AdapterOfflineMapCityBinding, cityBean: OfflineMapCityBean) {
+        binding.offlineMapProgress.progress =
+            (cityBean.currentSize * 100 / cityBean.fileSize).toInt()
+        when (cityBean.status) {
+            OfflineMapCityBean.NONE -> {
+                if (binding.offlineMapProgress.visibility == View.VISIBLE) binding.offlineMapProgress.visibility =
+                    View.INVISIBLE
+                binding.offlineMapDownloadBtn.text = "下载"
+            }
+            OfflineMapCityBean.WAITING -> {
+                if (binding.offlineMapProgress.visibility != View.VISIBLE) binding.offlineMapProgress.visibility =
+                    View.VISIBLE
+                binding.offlineMapDownloadBtn.text = "等待中"
+            }
+            OfflineMapCityBean.LOADING -> {
+                if (binding.offlineMapProgress.visibility != View.VISIBLE) binding.offlineMapProgress.visibility =
+                    View.VISIBLE
+                binding.offlineMapDownloadBtn.text = "暂停"
+            }
+            OfflineMapCityBean.PAUSE -> {
+                if (binding.offlineMapProgress.visibility != View.VISIBLE) binding.offlineMapProgress.visibility =
+                    View.VISIBLE
+                binding.offlineMapDownloadBtn.text = "继续"
+            }
+            OfflineMapCityBean.ERROR -> {
+                if (binding.offlineMapProgress.visibility != View.VISIBLE) binding.offlineMapProgress.visibility =
+                    View.VISIBLE
+                binding.offlineMapDownloadBtn.text = "重试"
+            }
+            OfflineMapCityBean.DONE -> {
+                if (binding.offlineMapProgress.visibility == View.VISIBLE) binding.offlineMapProgress.visibility =
+                    View.INVISIBLE
+                binding.offlineMapDownloadBtn.text = "已完成"
+            }
+            OfflineMapCityBean.UPDATE -> {
+                if (binding.offlineMapProgress.visibility == View.VISIBLE) binding.offlineMapProgress.visibility =
+                    View.INVISIBLE
+                binding.offlineMapDownloadBtn.text = "更新"
+            }
+        }
     }
 
     override fun getItemViewType(position: Int): Int {
         return R.layout.adapter_offline_map_city
     }
+}
+
 
-}

app/src/main/java/com/navinfo/omqs/ui/fragment/offlinemap/OfflineMapCityListFragment.kt

@@ -10,17 +10,28 @@ import androidx.fragment.app.viewModels
 import androidx.lifecycle.Observer
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.navinfo.omqs.databinding.FragmentOfflineMapCityListBinding
+import com.navinfo.omqs.http.RetrofitNetworkServiceAPI
+import com.navinfo.omqs.http.offlinemapdownload.OfflineMapDownloadManager
 import dagger.hilt.android.AndroidEntryPoint
+import javax.inject.Inject
 
 /**
  * 离线地图城市列表
  */
 @AndroidEntryPoint
 class OfflineMapCityListFragment : Fragment() {
+    @Inject
+    lateinit var downloadManager: OfflineMapDownloadManager
     private var _binding: FragmentOfflineMapCityListBinding? = null
     private val viewModel by viewModels<OfflineMapCityListViewModel>()
     private val binding get() = _binding!!
-    private val adapter: OfflineMapCityListAdapter by lazy { OfflineMapCityListAdapter() }
+    private val adapter: OfflineMapCityListAdapter by lazy {
+        OfflineMapCityListAdapter(
+            downloadManager,
+            requireContext()
+        )
+    }
+
     override fun onCreateView(
         inflater: LayoutInflater, container: ViewGroup?,
         savedInstanceState: Bundle?
@@ -33,8 +44,10 @@ class OfflineMapCityListFragment : Fragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         val layoutManager = LinearLayoutManager(context)
-        _binding!!.offlineMapCityListRecyclerview.layoutManager = layoutManager
-        _binding!!.offlineMapCityListRecyclerview.adapter = adapter
+        //// 设置 RecyclerView 的固定大小，避免在滚动时重新计算视图大小和布局，提高性能
+        binding.offlineMapCityListRecyclerview.setHasFixedSize(true)
+        binding.offlineMapCityListRecyclerview.layoutManager = layoutManager
+        binding.offlineMapCityListRecyclerview.adapter = adapter
         viewModel.cityListLiveData.observe(viewLifecycleOwner) {
             adapter.refreshData(it)
         }
@@ -44,6 +57,6 @@ class OfflineMapCityListFragment : Fragment() {
     override fun onDestroyView() {
         super.onDestroyView()
         _binding = null
-        Log.e("jingo","OfflineMapCityListFragment onDestroyView")
+        Log.e("jingo", "OfflineMapCityListFragment onDestroyView")
     }
 }

app/src/main/java/com/navinfo/omqs/ui/fragment/offlinemap/OfflineMapCityListViewModel.kt

@@ -32,7 +32,7 @@ class OfflineMapCityListViewModel @Inject constructor(
         viewModelScope.launch {
             when (val result = networkService.getOfflineMapCityList()) {
                 is NetResult.Success -> {
-                    cityListLiveData.postValue(result.data!!)
+                    cityListLiveData.postValue(result.data?.sortedBy { bean -> bean.id })
                 }
                 is NetResult.Error -> {
                     Toast.makeText(context, "${result.exception.message}", Toast.LENGTH_SHORT)

app/src/main/java/com/navinfo/omqs/ui/fragment/offlinemap/OfflineMapViewHolder.kt

@@ -0,0 +1,10 @@
+package com.navinfo.omqs.ui.fragment.offlinemap
+
+import com.navinfo.omqs.databinding.AdapterOfflineMapCityBinding
+import com.navinfo.omqs.ui.other.BaseViewHolder
+
+class OfflineMapViewHolder(dataBinding: AdapterOfflineMapCityBinding) : BaseViewHolder(dataBinding) {
+    init{
+        dataBinding.offlineMapDownloadBtn
+    }
+}