\u9805\u756a6\u304c\u6539\u884c\u3055\u308c\u3066\u3044\u306a\u3044\u3002<\/p>\n
Warning: It might be tempting to add your own code to the Application class, because the class is created before all of your activities and can hold global state. But just as it's error-prone to make readable and writable static variables that are globally available, it's easy to abuse the Application class. Avoid putting any activity code in the Application class unless the code is really needed.<\/p><\/blockquote>\n
\u3075\u30fc\u3080\u3001Application\u30af\u30e9\u30b9\u306b\u306f\u4f59\u8a08\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304b\u306a\u3044\u306e\u304c\u304a\u4f5c\u6cd5\u306a\u306e\u306d(\u00b4\uff65\u03c9\uff65\uff40)<\/p>\n
\n5. Explore lifecycle use cases<\/h2>\n
Use case 3: Partially hide the activity<\/h3>\n
Whatever code runs in onPause() blocks other things from displaying, so keep the code in onPause() lightweight.<\/p><\/blockquote>\n
onPause()\u5185\u306f\u8efd\u3081\u306b\u2026\u03c6(\uff65\u03c9\uff65\uff40 )\uff92\uff93\uff92\uff93\u2026<\/p>\n
\n6. Explore the fragment lifecycle<\/h2>\n
Lifecycles and logging\u306e\u5f8c\u306f\u6b21\u306eComplex Lifecycle Situations\u3078\u306e\u30ea\u30f3\u30af\u304c\u306a\u3044\uff1f<\/p>\n
\nAndroid Kotlin Fundamentals: Complex Lifecycle Situations<\/h1>\n
4. Task: Use the Android lifecycle library<\/h2>\n
Step 1: Turn DessertTimer into a LifecycleObserver<\/h3>\n
LifecycleOwner\u3092implement\u3057\u3066\u308b\u306e\u306fFragmentActivity\u306esuperclass\u306eComponentActivity<\/a>\u3067\u306f\u306a\u304b\u308d\u3046\u304b\u2026<\/p>\n
\n5. Task: Simulate app shutdown and use onSaveInstanceState()<\/h2>\n
Step 1: Use adb to simulate a process shutdown<\/h3>\n
The Android Debug Bridge (adb) is a command-line tool that lets you send instructions to emulators and devices attached to your computer. <\/p><\/blockquote>\n
Android Debug Bridge(adb)\u306f\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u306b\u63a5\u7d9a\u3055\u308c\u305f\u30c7\u30d0\u30a4\u30b9\u307e\u305f\u306f\u30a8\u30df\u30e5\u30ec\u30fc\u30bf\u3078\u6307\u793a\u3092\u9001\u308b\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u3068\u2026\u03c6(\uff65\u03c9\uff65\uff40 )\uff92\uff93\uff92\uff93\u2026<\/p>\n
4.Type adb and press Return.<\/span>
\n\u4eca\u3082\u5411\u3053\u3046\u3067\u306f\u30a8\u30f3\u30bf\u30fc\u3058\u3083\u306a\u304f\u3066\u30ea\u30bf\u30fc\u30f3\u30ad\u30fc\u547c\u3073\u304c\u4e3b\u6d41\u306a\u3093\u3060\u308d\u3046\u304b\u3002<\/p>\n\u3093\u30fc\u3001
\nadb shell am kill com.example.android.dessertclicker<\/span>
\n\u304c\u4e0a\u624b\u304f\u52d5\u3044\u3066\u306a\u3044\u306e\u304b\u3001Recents Screen\u304b\u3089\u5fa9\u5e30(?)\u3055\u305b\u3066\u3082\u3001\u524d\u306e\u72b6\u614b\u304c\u6b8b\u3063\u3066\u308b\u306a\u2026
\n\u4f55\u304b\u9593\u9055\u3063\u3066\u308b\u306a(\uff89\u2200`)<\/p>\nadb server version (41) doesn't match this client (40); killing...
\ncould not read ok from ADB Server
\n* failed to start daemon
\nerror: cannot connect to daemon<\/p><\/blockquote>\n\u3063\u3066\u51fa\u3066\u308b\u3051\u3069\u3001\u3053\u308c\u306f\u554f\u984c\u3042\u308b\u306e\u304b\u306a\u3044\u306e\u304b\u304c\u307e\u305a\u308f\u304b\u3089\u3093(\u30fb\u2200\u30fb)<\/p>\n
\u30b3\u30de\u30f3\u30c9\u30d7\u30ed\u30f3\u30d7\u30c8\u3067\u4e0a\u306e\u30b3\u30de\u30f3\u30c9\u3092\u653e\u3063\u305f\u3089\u3001\u4f55\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3082\u51fa\u3055\u305a\u306b\u7d42\u4e86\u51fa\u6765\u305f\u6a21\u69d8\u3002Recents Screen\u304b\u3089\u5fa9\u5e30\u3055\u305b\u305f\u3089\u3001\u7121\u4e8b\u306b\u524d\u306e\u72b6\u614b\u304c\u30ea\u30bb\u30c3\u30c8\u3055\u308c\u3066\u3044\u305f\u3002<\/p>\n
\u306a\u3093\u3067AS\u3060\u3068\u4e0a\u624b\u304f\u884c\u304b\u306a\u3044\u3093\u3060\u308d\u3046\u3068\u60a9\u3093\u3060\u304c\u3001\u4e00\u56de\u30b3\u30de\u30f3\u30c9\u30d7\u30ed\u30f3\u30c8\u5074\u3067\u4e0a\u624b\u304f\u884c\u3063\u305f\u3089\u3001AS\u3067\u3082\u4e0a\u624b\u304f\u884c\u304f\u3088\u3046\u306b\u306a\u3063\u305f\u3002\u539f\u56e0\u306f\u3088\u304f\u308f\u304b\u3089\u306a\u3044\u304c\u3001\u53d6\u308a\u6562\u3048\u305a\u89e3\u6c7a\u3057\u305f\u304b\u3089\u3044\u3044\u304b(\uff89\u2200`)
\nadb.exe\u304c\u8907\u6570\u8d77\u52d5\u3057\u3066\u305f\u3093\u304b\u306a\uff1f<\/p>\nStep 2: Use onSaveInstanceState() to save bundle data<\/h3>\n
A bundle is a collection of key-value pairs, where the keys are always strings.<\/p><\/blockquote>\n
\u524d\u306b\u3082\u8aac\u660e\u304c\u3042\u3063\u305f\u304c\u3001\u30ad\u30fc\u306f\u5fc5\u305a\u6587\u5b57\u5217\u306a\u3093\u3060\u306d\u3047\u3002<\/p>\n
Generally you should store far less than 100k, otherwise you risk crashing your app with the TransactionTooLargeException error.<\/p><\/blockquote>\n
\u30b5\u30a4\u30ba\u306f100KB\u4ee5\u4e0b\u306b\u6291\u3048\u306a\u3044\u3068\u99c4\u76ee\u3068\u2026\u03c6(\uff65\u03c9\uff65\uff40 )\uff92\uff93\uff92\uff93\u2026<\/p>\n
The putInt() method (and similar methods from the Bundle class like putFloat() and putString() takes two arguments:<\/span>
\nputString()\u306e\u5f8c\u306b\u9589\u3058\u62ec\u5f27\u304c\u629c\u3051\u3066\u308b\uff1f<\/p>\nStep 3: Use onCreate() to restore bundle data<\/h3>\n
So if the bundle is not null, you know you're \"re-creating\" the activity from a previously known point.<\/p><\/blockquote>\n
\u305d\u308c\u3067\u5224\u5b9a\u304c\u51fa\u6765\u308b\u308f\u3051\u304b\u3002<\/p>\n
which in turn
\nwhich in turn\u3063\u3066\u4f55\uff1f\u975e\u5236\u9650\u7528\u6cd5\uff08\u4ed8\u52a0\u7528\u6cd5\uff09\u3063\u3066\uff1f<\/a>
\n\u300cwhich in turn,\u300d\u306e\u8a33\u3057\u65b9\u306b\u3064\u3044\u3066 \u4e0b\u8a18\u306e\u6587\u7ae0\u3067\u300cwhich in turn,\u300d\u306f\u3069\u3046\u8a33\u305b\u3070\u826f\u3044\u3067\u3057\u2026<\/a><\/p>\n
\n\u3088\u3046\u3084\u3063\u3068\u3053\u3053\u307e\u3067\u3067Lesson4\u304c\u7d42\u308f\u3063\u305f\u2026(\u30fd'\u03c9`)
\n\u52c9\u5f37\u306b\u306a\u308b\u3051\u3069\u9577\u3044\u306a\uff57<\/p>\n","protected":false},"excerpt":{"rendered":"