Lifecycle\u662f\u751f\u547d\u5468\u671f\u611f\u77e5\u7ec4\u4ef6\uff0c\u53ef\u4ee5\u5bf9Activity\u6216\u8005Fragment\u7684\u751f\u547d\u5468\u671f\u7684\u72b6\u6001\u53d8\u5316\u505a\u51fa\u54cd\u5e94\uff0c\u5e2e\u52a9\u5f00\u53d1\u8005\u5199\u51fa\u66f4\u597d\u7ec4\u7ec7\u7684\uff0c\u8f7b\u91cf\u7ea7\u7684\u4ee3\u7801\uff0c\u66f4\u5bb9\u6613\u7ef4\u62a4\u3002<\/p>\n
<\/p>\n
\u4e3e\u4e2a\u6817\u5b50\uff0c\u5728\u5e94\u7528\u5f00\u53d1\u8fc7\u7a0b\u4e2d\uff0c\u5904\u7406Activity\u6216\u8005Fragment\u7684\u751f\u547d\u5468\u671f\u4e0d\u53ef\u907f\u514d\uff0c\u5148\u770b\u5b98\u65b9\u6587\u6863\u4e3e\u7684\u4f8b\u5b50\uff0c\u662f\u4e00\u6bb5\u5bf9\u83b7\u53d6\u4f4d\u7f6e\u7684\u76d1\u542c\u4ee3\u7801\uff0c\u5206\u522b\u5728 \u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u53ef\u80fd\u8981\u5728\u591a\u4e2aActivity\u7684\u751f\u547d\u5468\u671f\u8fdb\u884c\u56de\u8c03\uff0c\u8fd9\u6837\uff0cActivity\u4e2d\u5c31\u8981\u5199\u5927\u91cf\u4ee3\u7801\uff0c\u9020\u6210\u4ee3\u7801\u96be\u4ee5\u7ef4\u62a4\u3002\u8fd8\u6709\u4e00\u4e2a\u95ee\u9898\uff0c\u5982\u679c\u6211\u4eec\u5728 \u5b98\u65b9\u7ed9\u51fa\u7684\u6dfb\u52a0Lifecycle\u7684\u4f9d\u8d56\u5982\u4e0b\uff1a<\/p>\n \u521b\u5efaMyObserver\u5e76\u5b9e\u73b0LifecycleObserver\u63a5\u53e3\uff0cLifecycle\u5b9e\u73b0\u7684\u8fc7\u7a0b\u5b9e\u9645\u4e0a\u662f\u89c2\u5bdf\u8005\u6a21\u5f0f\u3002<\/p>\n \u5728Activity\u4e2d\uff0c\u53ea\u8981\u5c06\u81ea\u5b9a\u4e49\u7684MyObserver\u6dfb\u52a0\u5230\u76d1\u542c\u5217\u8868\u4e2d\uff0c\u5c31\u53ef\u4ee5\u76d1\u542c\u5230Activity\u7684\u751f\u547d\u5468\u671f\u53d8\u5316\u3002<\/p>\n \u4ece\u6267\u884c\u7ed3\u679c\u4e2d\uff0c\u770b\u5230\u4e86\u662f\u6267\u884c\u4e86\u7d22\u8981\u76d1\u542c\u7684\u751f\u547d\u5468\u671f\u3002<\/p>\n LifecycleOwner\u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n \u53ef\u4ee5\u770b\u5230\uff0cLifecycleOwner\u53ea\u6709\u4e00\u4e2a\u65b9\u6cd5\uff0c\u8fd4\u56de\u4e86Lifecycle\uff0cLifecycle\u8fd9\u4e2a\u7c7b\u5305\u542bFragments \u548c Activities\u7684\u751f\u547d\u5468\u671f\u72b6\u6001\uff0c\u5e76\u4e14\u53ef\u4ee5\u8ba9\u5176\u4ed6\u7684\u7ec4\u4ef6\u89c2\u5bdf\u8fd9\u4e2a\u72b6\u6001\u3002<\/p>\n Fragment \u548c AppCompatActivity\u5728Support Library 26.1.0\u53ca\u4ee5\u540e\u7684\u7248\u672c\u5df2\u7ecf\u5b9e\u73b0\u4e86LifecycleOwner\u63a5\u53e3\uff0c\u5982\u679c\u6211\u4eec\u60f3\u8981\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7c7b\uff0c\u62e5\u6709Fragments \u548c Activities\u7684\u751f\u547d\u5468\u671f\u72b6\u6001\uff0c\u53ef\u4ee5\u5b9e\u73b0LifecycleOwner\u63a5\u53e3\uff0c\u4f7f\u7528LifecycleRegistry\u7c7b\uff0c\u5177\u4f53\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n \u901a\u8fc7\u65b0\u5efaLifecycleRegistry\uff0c\u4e3aLifecycleRegistry\u8bbe\u7f6eLifecycle\u7684\u5404\u4e2a\u72b6\u6001\u3002<\/p>\n \u540c\u4e0a\u6ce8\u518c\u89c2\u5bdf\u8005\u5373\u53ef\uff1a<\/p>\n \u524d\u8a00 Lifecycle\u662f\u751f\u547d\u5468\u671f\u611f\u77e5\u7ec4\u4ef6\uff0c\u53ef\u4ee5\u5bf9Activity\u6216\u8005Fragment\u7684\u751f\u547d\u5468\u671f\u7684\u72b6\u6001\u53d8\u5316\u505a\u51fa […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[311],"tags":[410],"class_list":["post-1637","post","type-post","status-publish","format-standard","hentry","category-android-advance","tag-jetpack"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1637","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1637"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1637\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1637"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1637"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1637"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}onStart()<\/code>\u91cc\u542f\u52a8\u76d1\u542c\u548c\u5728onStop()<\/code>\u91cc\u505c\u6b62\u76d1\u542c\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\nclass MyLocationListener(private val context: Context, private val callback:(Location) -> Unit) {\n\n fun start(){\n \/\/ \u8fde\u63a5\u63a5\u5b9a\u4f4d\u7cfb\u7edf\u670d\u52a1\n }\n\n fun stop(){\n \/\/ \u65ad\u5f00\u4e0e\u5b9a\u4f4d\u670d\u52a1\u7684\u8fde\u63a5\n }\n}\n\nclass MyLocationActivity : AppCompatActivity() {\n\n private lateinit var myLocationListener: MyLocationListener\n\n override fun onCreate(savedInstanceState: Bundle?) {\n super.onCreate(savedInstanceState)\n setContentView(R.layout.activity_my_location)\n\n myLocationListener = MyLocationListener(this) {\n \/\/ updata UI\n }\n }\n\n override fun onStart() {\n super.onStart()\n myLocationListener.start()\n }\n\n override fun onStop() {\n super.onStop()\n myLocationListener.stop()\n }\n}<\/code><\/pre>\nonStart()<\/code>\u65b9\u6cd5\u91cc\u505a\u4e86\u8017\u65f6\u64cd\u4f5c\uff0c\u5c31\u53ef\u80fd\u9020\u6210\u5f53Activity\u6216\u8005Fragment\u7684onStop()<\/code>\u65b9\u6cd5\u5728onStart()<\/code>\u65b9\u6cd5\u4e4b\u524d\u7ed3\u675f\uff0c\u6240\u4ee5\uff0c\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u611f\u77e5\u751f\u547d\u5468\u671f\u7684\u7ec4\u4ef6\uff0c\u8fd9\u5c31\u662fLifecycle\u3002<\/p>\n\u4f7f\u7528Lifecycle<\/h2>\n
\u6dfb\u52a0\u4f9d\u8d56<\/h3>\n
dependencies {\n def lifecycle_version = "2.1.0"\n\n \/\/ ViewModel and LiveData\n implementation "androidx.lifecycle:lifecycle-extensions:$lifecycle_version"\n \/\/ alternatively - just ViewModel\n implementation "androidx.lifecycle:lifecycle-viewmodel:$lifecycle_version" \/\/ For Kotlin use lifecycle-viewmodel-ktx\n \/\/ alternatively - just LiveData\n implementation "androidx.lifecycle:lifecycle-livedata:$lifecycle_version"\n \/\/ alternatively - Lifecycles only (no ViewModel or LiveData). Some UI\n \/\/ AndroidX libraries use this lightweight import for Lifecycle\n implementation "androidx.lifecycle:lifecycle-runtime:$lifecycle_version"\n\n annotationProcessor "androidx.lifecycle:lifecycle-compiler:$lifecycle_version" \/\/ For Kotlin use kapt instead of annotationProcessor\n \/\/ alternately - if using Java8, use the following instead of lifecycle-compiler\n implementation "androidx.lifecycle:lifecycle-common-java8:$lifecycle_version"\n\n \/\/ optional - ReactiveStreams support for LiveData\n implementation "androidx.lifecycle:lifecycle-reactivestreams:$lifecycle_version" \/\/ For Kotlin use lifecycle-reactivestreams-ktx\n\n \/\/ optional - Test helpers for LiveData\n testImplementation "androidx.arch.core:core-testing:$lifecycle_version"\n}<\/code><\/pre>\n\u521b\u5efaMyObserver<\/h3>\n
package cn.appblog.jetpack.lifecycle;\n\npublic interface LifecycleCallback {\n void update(String message);\n}<\/code><\/pre>\npackage cn.appblog.jetpack.lifecycle;\n\nimport android.util.Log;\n\nimport androidx.lifecycle.Lifecycle;\nimport androidx.lifecycle.LifecycleObserver;\nimport androidx.lifecycle.OnLifecycleEvent;\n\npublic class MyObserver implements LifecycleObserver {\n\n private Lifecycle lifecycle;\n private LifecycleCallback lifecycleCallback;\n\n public MyObserver(Lifecycle lifecycle, LifecycleCallback lifecycleCallback) {\n this.lifecycle = lifecycle;\n this.lifecycleCallback = lifecycleCallback;\n }\n\n @OnLifecycleEvent(Lifecycle.Event.ON_CREATE)\n public void connectOnCreate() {\n Log.i("yezhou", "OnCreate");\n update("OnCreate");\n }\n\n @OnLifecycleEvent(Lifecycle.Event.ON_START)\n public void connectOnStart() {\n Log.i("yezhou", "OnStart");\n update("OnStart");\n }\n\n @OnLifecycleEvent(Lifecycle.Event.ON_RESUME)\n public void connectOnResume() {\n Log.i("yezhou", "OnResume");\n update("OnResume");\n }\n\n @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)\n public void connectOnPause() {\n Log.i("yezhou", "OnPause");\n update("OnPause");\n }\n\n @OnLifecycleEvent(Lifecycle.Event.ON_STOP)\n public void connectOnStop() {\n Log.i("yezhou", "OnStop");\n update("OnStop");\n }\n\n @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)\n public void connectOnDestroy() {\n Log.i("yezhou", "OnDestroy");\n update("OnDestroy");\n }\n\n private void update(String message) {\n lifecycleCallback.update(message);\n }\n}<\/code><\/pre>\n\u5728Activity\u4e2d\u4f7f\u7528<\/h3>\n
package cn.appblog.jetpack.lifecycle;\n\nimport android.os.Bundle;\nimport android.util.Log;\n\nimport androidx.annotation.Nullable;\nimport androidx.appcompat.app.AppCompatActivity;\nimport androidx.lifecycle.Lifecycle;\n\npublic class LifecycleActivity extends AppCompatActivity {\n\n private MyObserver myObserver;\n\n @Override\n protected void onCreate(@Nullable Bundle savedInstanceState) {\n super.onCreate(savedInstanceState);\n Lifecycle lifecycle = getLifecycle();\n myObserver = new MyObserver(lifecycle, new LifecycleCallback() {\n @Override\n public void update(String message) {\n Log.i("yezhou", "LifecycleActivity.myObserver.update: " + message);\n }\n });\n\n lifecycle.addObserver(myObserver);\n }\n\n}<\/code><\/pre>\ncn.appblog.jetpack I\/yezhou: OnCreate\ncn.appblog.jetpack I\/yezhou: LifecycleActivity.myObserver.update: OnCreate\ncn.appblog.jetpack I\/yezhou: OnStart\ncn.appblog.jetpack I\/yezhou: LifecycleActivity.myObserver.update: OnStart\ncn.appblog.jetpack I\/yezhou: OnResume\ncn.appblog.jetpack I\/yezhou: LifecycleActivity.myObserver.update: OnResume\ncn.appblog.jetpack I\/yezhou: OnPause\ncn.appblog.jetpack I\/yezhou: LifecycleActivity.myObserver.update: OnPause\ncn.appblog.jetpack I\/yezhou: OnStop\ncn.appblog.jetpack I\/yezhou: LifecycleActivity.myObserver.update: OnStop\ncn.appblog.jetpack I\/yezhou: OnDestroy\ncn.appblog.jetpack I\/yezhou: LifecycleActivity.myObserver.update: OnDestroy<\/code><\/pre>\n\u5b9e\u73b0\u81ea\u5b9a\u4e49\u7684LifecycleOwner<\/h2>\n
package androidx.lifecycle;\n\nimport androidx.annotation.NonNull;\n\n\/**\n * A class that has an Android lifecycle. These events can be used by custom components to\n * handle lifecycle changes without implementing any code inside the Activity or the Fragment.\n *\n * @see Lifecycle\n *\/\n@SuppressWarnings({"WeakerAccess", "unused"})\npublic interface LifecycleOwner {\n \/**\n * Returns the Lifecycle of the provider.\n *\n * @return The lifecycle of the provider.\n *\/\n @NonNull\n Lifecycle getLifecycle();\n}<\/code><\/pre>\npackage cn.appblog.jetpack.lifecycle;\n\nimport android.app.Activity;\nimport android.os.Bundle;\n\nimport androidx.annotation.NonNull;\nimport androidx.annotation.Nullable;\nimport androidx.lifecycle.Lifecycle;\nimport androidx.lifecycle.LifecycleOwner;\nimport androidx.lifecycle.LifecycleRegistry;\n\npublic class BaseActivity extends Activity implements LifecycleOwner {\n\n protected LifecycleRegistry lifecycleRegistry;\n\n @Override\n protected void onCreate(@Nullable Bundle savedInstanceState) {\n super.onCreate(savedInstanceState);\n lifecycleRegistry = new LifecycleRegistry(this);\n lifecycleRegistry.setCurrentState(Lifecycle.State.CREATED);\n }\n\n @Override\n protected void onStart() {\n super.onStart();\n lifecycleRegistry.setCurrentState(Lifecycle.State.STARTED);\n }\n\n @Override\n protected void onResume() {\n super.onResume();\n lifecycleRegistry.setCurrentState(Lifecycle.State.RESUMED);\n }\n\n @Override\n protected void onDestroy() {\n super.onDestroy();\n lifecycleRegistry.setCurrentState(Lifecycle.State.DESTROYED);\n }\n\n @NonNull\n @Override\n public Lifecycle getLifecycle() {\n return lifecycleRegistry;\n }\n}<\/code><\/pre>\npackage cn.appblog.jetpack.lifecycle;\n\nimport android.os.Bundle;\nimport android.util.Log;\n\nimport androidx.annotation.Nullable;\nimport androidx.lifecycle.Lifecycle;\n\npublic class LifecycleOwnerActivity extends BaseActivity {\n\n private MyObserver myObserver;\n\n @Override\n protected void onCreate(@Nullable Bundle savedInstanceState) {\n super.onCreate(savedInstanceState);\n Lifecycle lifecycle = getLifecycle();\n myObserver = new MyObserver(lifecycle, new LifecycleCallback() {\n @Override\n public void update(String message) {\n Log.i("yezhou", "LifecycleOwnerActivity.myObserver.update: " + message);\n }\n });\n lifecycle.addObserver(myObserver);\n }\n}<\/code><\/pre>\ncn.appblog.jetpack I\/yezhou: OnCreate\ncn.appblog.jetpack I\/yezhou: LifecycleOwnerActivity.myObserver.update: OnCreate\ncn.appblog.jetpack I\/yezhou: OnStart\ncn.appblog.jetpack I\/yezhou: LifecycleOwnerActivity.myObserver.update: OnStart\ncn.appblog.jetpack I\/yezhou: OnResume\ncn.appblog.jetpack I\/yezhou: LifecycleOwnerActivity.myObserver.update: OnResume\ncn.appblog.jetpack I\/yezhou: OnPause\ncn.appblog.jetpack I\/yezhou: LifecycleOwnerActivity.myObserver.update: OnPause\ncn.appblog.jetpack I\/yezhou: OnStop\ncn.appblog.jetpack I\/yezhou: LifecycleOwnerActivity.myObserver.update: OnStop\ncn.appblog.jetpack I\/yezhou: OnDestroy\ncn.appblog.jetpack I\/yezhou: LifecycleOwnerActivity.myObserver.update: OnDestroy<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"