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标题: OpenHarmony 4.0 Release 循环拉起应用功能 [打印本页]

作者: onefan 时间: 6 天前
标题: OpenHarmony 4.0 Release 循环拉起应用功能
[md]##### 需求场景：有部分应用在异常退出时希望重新被启动，无需用户手动操作。

##### 需求分析：

我们还是可以使用在某个常驻服务来实现拉起操作，还是走launcher创建窗口时来实现。此时我们需要去监听某个应用被杀死的状态，刚好 appManager.on(‘applicationState’, applicationStateObserver)这个接口实现了监听应用的状态，并在onProcessDied中可以查询到指定应用的bundleName列表，依赖来实现再次拉起指定应用的场景。

##### 代码示例：

```
         //新增需求，xxx应用被杀掉后需要再此被拉起
         let applicationStateObserver: appManager.ApplicationStateObserver = {
            onForegroundApplicationChanged(appStateData) {
            console.log(`[appManager] onForegroundApplicationChanged: ${JSON.stringify(appStateData)}`);
            },
            onAbilityStateChanged(abilityStateData) {
            console.log(`[appManager] onAbilityStateChanged: ${JSON.stringify(abilityStateData)}`);
            },
            onProcessCreated(processData) {
            console.log(`[appManager] onProcessCreated: ${JSON.stringify(processData)}`);
            },
            onProcessDied(processData) {
            console.log(`[appManager] onProcessDied: ${JSON.stringify(processData)}`);
            if(processData.bundleName === 'com.xx.xxx'){
               if (systemparameter.getSync('persist.autostart.xxx', '0') === '1') {
                  setTimeout(() => {
                  let want = {
                     "deviceId": "",
                     "bundleName": "com.xx.xxx",
                     "abilityName": "EntryAbility"
                  };
                  globalThis.desktopContext.startAbility(want).then(() => {
                     Log.showInfo(TAG, '[appManager] OneFan processData startAbility success');
                  }).catch((error) => {
                     Log.showInfo(TAG, '[appManager] OneFan processData startAbility failed');
                  })
                  }, 500)
               } else {
                  Log.showInfo(TAG, '[appManager] OneFan processData persist.autostart.dts err');
               }
            }
            },
            onProcessStateChanged(processData) {
            console.log(`[appManager] onProcessStateChanged: ${JSON.stringify(processData)}`);
            }
         };
         try {
            const observerId = appManager.on('applicationState', applicationStateObserver);
            console.log(`[appManager] observerCode: ${observerId}`);
         } catch (paramError) {
            let code = (paramError as BusinessError).code;
            let message = (paramError as BusinessError).message;
            console.error(`[appManager] error: ${code}, ${message} `);
         }
         //新增需求，xxx应用被杀掉后需要再此被拉起
```

而相对于服务型应用来说，我们只需要在install\_list\_capability.json及签名中配置keepAlive为true即可。
[/md]

作者: YuqiZ 时间: 6 天前
学会了学会了谢谢🙏

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