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uni.onMemoryWarning(CALLBACK)

Listen for out-of-memory warning events.

This event is triggered when iOS/Android issues a memory warning to the MiniApp process. There is an alarm level division under Android, but there is no level division under iOS.

Platform Difference Description

App	H5	微信小程序	支付宝小程序	百度小程序	抖音小程序、飞书小程序	QQ小程序	快手小程序	京东小程序	元服务	小红书小程序
Android 3.6.9+、iOS 3.6.11+	x	√	√	√	√	√	√	√	x	√

onMemoryWarning 兼容性

HarmonyOS
x

This API is uni ext api, you need to download the plug-in: https://ext.dcloud.net.cn/plugin?id= 10071

CALLBACK return parameter:

parameter name	type	description
level	Number	Only Android has this field, which corresponds to the system memory alarm level macro definition

Legal values for level

Value	Corresponding Android alarm value	Description
5	TRIM_MEMORY_RUNNING_MODERATE	The process is in the middle of the background LRU list; freeing memory can help the system keep other processes running later in the list for better overall performance.
10	TRIM_MEMORY_RUNNING_LOW	The process is not a consumable background process, but the device is low on memory
15	TRIM_MEMORY_RUNNING_CRITICAL	The process is not a consumable background process, but the device is running very low on memory and is about to be unable to keep any background processes running.

code example

const callback = function (res) {
 console.log(res,'onMemoryWarningReceive');
}
uni.onMemoryWarning(callback);

uni.offMemoryWarning(CALLBACK)

Cancel listening to insufficient memory warning events. If no callback is passed in, all listeners will be cancelled.

Platform Difference Description

App	H5	微信小程序	支付宝小程序	百度小程序	抖音小程序、飞书小程序	QQ小程序	快手小程序	京东小程序	元服务	小红书小程序
x	x	√	√	√	√	x	√	√	x	√

offMemoryWarning 兼容性

HarmonyOS
x

Property	Type	Description
Callback function	Function	Callback function for low memory alarm event

code example

const callback = function (res) {
 console.log(res);
}
uni.onMemoryWarning(callback);
// Just pass in the same function as onMemoryWarning
uni.offMemoryWarning(callback);

Tips

• CALLBACK is the CALLBACK passed in when calling uni.onMemoryWarning