Create TaskListActivity.kt

Author: Soltus

app/src/main/java/com/example/multitaskdemo/TaskListActivity.kt

@@ -0,0 +1,23 @@
+class TaskListActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val textView = TextView(this).apply {
+            setPadding(50, 50, 50, 50)
+            textSize = 16f
+        }
+        setContentView(textView)
+
+        val am = getSystemService(ACTIVITY_SERVICE) as ActivityManager
+        val tasks = am.appTasks  // 只返回本应用的任务
+        val sb = StringBuilder("Current App Tasks (${tasks.size}):\n\n")
+        for ((index, task) in tasks.withIndex()) {
+            val info = task.taskInfo
+            sb.append("Task ${index+1}:\n")
+            sb.append("  id: ${info.id}\n")
+            sb.append("  baseActivity: ${info.baseActivity?.className ?: "N/A"}\n")
+            sb.append("  topActivity: ${info.topActivity?.className ?: "N/A"}\n")
+            sb.append("  numActivities: ${info.numActivities}\n\n")
+        }
+        textView.text = sb.toString()
+    }
+}