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移动应用生命周期管理

理解移动应用程序的生命周期管理及其重要性。

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移动应用生命周期管理

理解移动应用程序的生命周期管理及其重要性。

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Web app’s uninterrupted execution vs. a mobile app’s state transitions
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Life cycle of an Android app
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Life cycle of an iOS app
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Cross-platform life cycle management
1.

Why should long-running operations like network calls, heavy computation, or location tracking be paused or offloaded when an app transitions to the background?

0/500

Point to ponder

1@Override
2protected void onSaveInstanceState(Bundle outState) {
3    super.onSaveInstanceState(outState);
4    outState.putString("noteDraft", editText.getText().toString());
5}

在 Android 中使用 onCreate() 恢复笔记草稿 

1@Override
2protected void onCreate(Bundle savedInstanceState) {
3    super.onCreate(savedInstanceState);
4    setContentView(R.layout.activity_main);
5    
6    if (savedInstanceState != null) {
7        String draft = savedInstanceState.getString("noteDraft");
8        editText.setText(draft);
9    }
10}

在 iOS 中应用进入后台时保存草稿 

1func sceneDidEnterBackground(_ scene: UIScene) {
2    let draftText = noteTextView.text
3    UserDefaults.standard.set(draftText, forKey: "noteDraft")
4}

应用恢复时恢复笔记草稿 

1func sceneWillEnterForeground(_ scene: UIScene) {
2    if let draft = UserDefaults.standard.string(forKey: "noteDraft") {
3        noteTextView.text = draft
4    }
5}
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Releasing mobile resources in the background

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Quiz

单选题

Android 中保存临时 UI 状态的正确方法是什么？

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移动应用中的数据管理与状态

后台处理与调度