增加离线地图下载流程

app/src/main/java/com/navinfo/omqs/http/offlinemapdownload/OfflineMapDownloadManager.kt

@@ -0,0 +1,48 @@
+package com.navinfo.omqs.http.offlinemapdownload
+
+import android.content.Context
+import android.os.Environment
+import android.text.TextUtils
+import com.navinfo.omqs.Constant
+import com.navinfo.omqs.bean.OfflineMapCityBean
+import dagger.hilt.android.qualifiers.ActivityContext
+import java.io.Serializable
+import java.util.concurrent.ConcurrentHashMap
+import javax.inject.Inject
+
+/**
+ * 管理离线地图下载
+ */
+class OfflineMapDownloadManager @Inject constructor(@ActivityContext context: Context) {
+    /**
+     * 最多同时下载数量
+     */
+    private val MAX_SCOPE = 5
+
+    /**
+     * 存储有哪些城市需要下载
+     */
+    private val scopeMap: ConcurrentHashMap<String, OfflineMapDownloadScope> by lazy(mode = LazyThreadSafetyMode.SYNCHRONIZED) {
+        ConcurrentHashMap<String, OfflineMapDownloadScope>()
+    }
+
+    val downloadFolder: String? by lazy {
+        Constant.MAP_PATH + "/offline/"
+    }
+
+
+    /**
+     * 请求一个下载任务[OfflineMapDownloadScope]
+     * 这是创建[OfflineMapDownloadScope]的唯一途径,请不要通过其他方式创建[OfflineMapDownloadScope]
+     */
+    fun request(cityBean: OfflineMapCityBean): OfflineMapDownloadScope? {
+        //没有下载连接的不能下载
+        if (TextUtils.isEmpty(cityBean.url)) return null
+//        if(scopeMap.containsKey())
+        var downloadScope = scopeMap[cityBean.id]
+        if (downloadScope == null) {
+            scopeMap[cityBean.id] = OfflineMapDownloadScope(cityBean)
+        }
+        return downloadScope
+    }
+}

app/src/main/java/com/navinfo/omqs/http/offlinemapdownload/OfflineMapDownloadScope.kt

@@ -0,0 +1,26 @@
+package com.navinfo.omqs.http.offlinemapdownload
+
+import androidx.lifecycle.MutableLiveData
+import com.navinfo.omqs.bean.OfflineMapCityBean
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Job
+import kotlin.coroutines.EmptyCoroutineContext
+
+/**
+ * 代表一个下载任务
+ * [OfflineMapCityBean.id]将做为下载任务的唯一标识
+ * 不要直接在外部直接创建此对象,那样就可能无法统一管理下载任务,请通过[OfflineMapDownloadManager.download]获取此对象
+ * 这是一个协程作用域，
+ * EmptyCoroutineContext 表示一个不包含任何元素的协程上下文，它通常用于创建新的协程上下文，或者作为协程上下文的基础。
+ */
+class OfflineMapDownloadScope(cityBean: OfflineMapCityBean) : CoroutineScope by CoroutineScope(EmptyCoroutineContext) {
+    /**
+     *
+     */
+    private var downloadJob: Job? = null
+
+    /**
+     *
+     */
+    private val downloadData = MutableLiveData<OfflineMapCityBean>()
+}