caochunlei1@huawei.com

Signed-off-by: caochunlei <caochunlei1@huawei.com>

api/@ohos.application.Ability.d.ts

@@ -302,4 +302,16 @@ export default class Ability {
      * @StageModelOnly
      */
     dump(params: Array<string>): Array<string>;
+
+    /**
+     * Called when the system has determined to trim the memory, for example, when the ability is running in the
+     * background and there is no enough memory for running as many background processes as possible.
+     *
+     * @since 9
+     * @syscap SystemCapability.Ability.AbilityRuntime.AbilityCore
+     * @param level Indicates the memory trim level, which shows the current memory usage status.
+     * @return -
+     * @StageModelOnly
+     */
+     onMemoryLevel(level: AbilityConstant.MemoryLevel): void;
 }

api/@ohos.application.AbilityConstant.d.ts

@@ -89,6 +89,19 @@ declare namespace AbilityConstant {
         MISMATCH = 2,
     }
 
+    /**
+     * Type of memory level.
+     *
+     * @since 9
+     * @syscap SystemCapability.Ability.AbilityRuntime.Core
+     * @StageModelOnly
+     */
+     export enum MemoryLevel {
+        MEMORY_LEVEL_MODERATE = 0,
+        MEMORY_LEVEL_LOW = 1,
+        MEMORY_LEVEL_CRITICAL = 2,
+    }
+
     /**
      * Type of window mode.
      *