你們給點評論好很差,我發上來是但願看看你們的意見想法,贊對我沒太大的意義 java
application 在之前是很是重要的一個地方,剛開始開發時咱們會在 application 中存儲數據,提供全局公共方法,application 雖然很方便,可是漸漸的咱們仍是放棄了在 application 裏面作其餘的工做,如今 application 主要的應用場景是:android
可是我在使用 application 時仍是遇到了一些問題很差處理:git
我想你們都曾爲了上面的問題煩惱過吧,也許你已經解決了,也許你只是臨時解決了,也許你還沒解決。一樣這也困擾過我,之前我只是臨時解決,代碼耦合難看,還沒發適應愈來愈高的複用要求,一處該,到處動,這樣的代碼不是我想要的,早就該掃到垃圾箱裏去了,因而誕生了今天的文章github
我對 application 是這樣安排的:app
話說官方的 Lifecycle 剛出來時我是很是興奮的,我想這下 app 的生命週期該好用了吧,興奮的我一看官方壓根就沒動 application,只是把 Activity 的聲明周期函數響應式化了,我是很失望的,也許 google 考慮兼容性吧ide
application 的核心就是這個了,一切的基礎都是他在身上作的函數
public class Application extends ContextWrapper implements ComponentCallbacks2 {
private ArrayList<ActivityLifecycleCallbacks> mActivityLifecycleCallbacks = new ArrayList<ActivityLifecycleCallbacks>();
public interface ActivityLifecycleCallbacks {
void onActivityCreated(Activity activity, Bundle savedInstanceState);
void onActivityStarted(Activity activity);
void onActivityResumed(Activity activity);
void onActivityPaused(Activity activity);
void onActivityStopped(Activity activity);
void onActivitySaveInstanceState(Activity activity, Bundle outState);
void onActivityDestroyed(Activity activity);
}
}
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咱們平時使用 ActivityLifecycleCallbacks 基本都是這個樣子的工具
this.registerActivityLifecycleCallbacks(object : ActivityLifecycleCallbacks {
override fun onActivityCreated(activity: Activity?, savedInstanceState: Bundle?) {
Log.d("AA", "onActivityCreated")
}
override fun onActivityResumed(activity: Activity?) {
Log.d("AA", "onActivityResumed")
}
override fun onActivityStarted(activity: Activity?) {
Log.d("AA", "onActivityStarted")
}
override fun onActivityPaused(activity: Activity?) {
Log.d("AA", "AA")
}
override fun onActivityDestroyed(activity: Activity?) {
Log.d("AA", "onActivityDestroyed")
}
override fun onActivitySaveInstanceState(activity: Activity?, outState: Bundle?) {
Log.d("AA", "onActivitySaveInstanceState")
}
override fun onActivityStopped(activity: Activity?) {
Log.d("AA", "onActivityStopped")
}
})
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跟進源碼看看ui
public void registerActivityLifecycleCallbacks(ActivityLifecycleCallbacks callback) {
synchronized (mActivityLifecycleCallbacks) {
mActivityLifecycleCallbacks.add(callback);
}
}
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注意看是 add 方法,這說明啥,這說明 ActivityLifecycleCallbacks 咱們能夠添加多個,Activity 會在相應的生命週期函數中發射相關消息this
protected void onCreate(@Nullable Bundle savedInstanceState) {
getApplication().dispatchActivityCreated(this, savedInstanceState);
}
void dispatchActivityCreated(Activity activity, Bundle savedInstanceState) {
Object[] callbacks = collectActivityLifecycleCallbacks();
if (callbacks != null) {
for (int i=0; i<callbacks.length; i++) {
((ActivityLifecycleCallbacks)callbacks[i]).onActivityCreated(activity,
savedInstanceState);
}
}
}
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咱們添加 2個 ActivityLifecycleCallbacks 進去
事實證實,的確能夠添加多個回調,而且沒有問題,這也是咱們本身封裝 application 組件的基石
我就不畫 UML 類圖,由於很簡單
考慮到我要在 application 組件裏添加不少功能進來,那麼良好合理的分層
就必不可少了,即使是該功能很是簡單,直接在 ApplicationManage 裏實現更方便,可是基於單一職責原則
必須分工明確,如今費點勁,之後省大事
我設計瞭如下幾個角色:
Lifecycle 和 StateManage 都是私有的,不是應該外部可見的。外部只須要註冊生命週期的 observer,不須要知道我怎麼實現的。一樣 外部不須要知道咱們怎麼管理的 app 當前狀態,只須要知道如今 app 是個什麼樣子。這部分我經過 ApplicationManage 對外提供相應方法
另外我在寫消息類型和 app 狀態類型時,我考慮了下相應的 type 放在哪裏合適,是相應 manage 的內部類,仍是專門一個類。內部類方便外界使用,專門的類方便查看代碼結構,這就得看實際場景了,Lifecycle 這塊我是用的內部類作的,這樣邏輯順延好些代碼,exit 這塊基本都是對內的,不暴露出來,因此專門維護了一個類
class MyApplication : Application() {
override fun onCreate() {
super.onCreate()
ScreenAutoManager.instance.init(this, 1080.0f, ScreenAutoManager.BASE_LINE_WIDTH)
ApplicationManage.init(this)
ApplicationManage.instance.addObserver { lifecycleMessage ->
when (lifecycleMessage.type) {
ApplicationManage.MessageType.MESSAGE_ACTIVITY_CREATE -> {
if (lifecycleMessage.activity != null) ScreenAutoManager.instance.onActivityCreated(lifecycleMessage.activity)
Log.d("AA", "MESSAGE_ACTIVITY_CREATE")
}
ApplicationManage.MessageType.MESSAGE_ACTIVITY_START -> {
if (lifecycleMessage.activity != null) ScreenAutoManager.instance.onActivityStarted(lifecycleMessage.activity)
Log.d("AA", "MESSAGE_ACTIVITY_START")
}
ApplicationManage.MessageType.MESSAGE_ACTIVITY_RESUME -> {
if (lifecycleMessage.activity != null) ScreenAutoManager.instance.onActivityResumed(lifecycleMessage.activity)
Log.d("AA", "MESSAGE_ACTIVITY_RESUME")
}
ApplicationManage.MessageType.MESSAGE_ACTIVITY_PAUSE -> Log.d("AA", "MESSAGE_ACTIVITY_PAUSE")
ApplicationManage.MessageType.MESSAGE_ACTIVITY_STOP -> Log.d("AA", "MESSAGE_ACTIVITY_STOP")
ApplicationManage.MessageType.MESSAGE_ACTIVITY_SAVEINSTANCESTATE -> Log.d("AA", "MESSAGE_ACTIVITY_SAVEINSTANCESTATE")
ApplicationManage.MessageType.MESSAGE_ACTIVITY_DESTROYED -> Log.d("AA", "MESSAGE_ACTIVITY_DESTROYED")
ApplicationManage.MessageType.MESSAGE_APP_START -> Log.d("AA", "MESSAGE_APP_START")
ApplicationManage.MessageType.MESSAGE_APP_EXIT -> Log.d("AA", "MESSAGE_APP_EXIT")
ApplicationManage.MessageType.MESSAGE_APP_FORNT -> Log.d("AA", "MESSAGE_APP_FORNT")
ApplicationManage.MessageType.MESSAGE_APP_BACKGROUD -> Log.d("AA", "MESSAGE_APP_BACKGROUD")
}
}
}
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我我的是很喜歡 Lifecycle 的,官方人家但是用的 apt 作的,我註解這塊寫很差,藉助的是 Livedata,在 registerActivityLifecycleCallbacks 時發射相應的消息出來
class LifecycleManage {
var lifecycleLivaData: MyLiveData<LifecycleMessage> = MyLiveData()
/** * 初始化方法 */
fun init(application: Application) {
registerActivityLifecycleCallbacks(application)
}
/** * 註冊 application 生命週期回調函數,在對應的函數回調中發射對應的消息 */
private fun registerActivityLifecycleCallbacks(application: Application) {
if (application == null) return
application.registerActivityLifecycleCallbacks(object : Application.ActivityLifecycleCallbacks {
override fun onActivityCreated(activity: Activity?, savedInstanceState: Bundle?) {
lifecycleLivaData.sendValue(LifecycleMessage(type = ApplicationManage.MessageType.MESSAGE_ACTIVITY_CREATE, activity = activity, savedInstanceState = savedInstanceState))
}
override fun onActivityStarted(activity: Activity?) {
lifecycleLivaData.sendValue(LifecycleMessage(type = ApplicationManage.MessageType.MESSAGE_ACTIVITY_START, activity = activity))
}
override fun onActivityResumed(activity: Activity?) {
lifecycleLivaData.sendValue(LifecycleMessage(type = ApplicationManage.MessageType.MESSAGE_ACTIVITY_RESUME, activity = activity))
}
override fun onActivityPaused(activity: Activity?) {
lifecycleLivaData.sendValue(LifecycleMessage(type = ApplicationManage.MessageType.MESSAGE_ACTIVITY_PAUSE, activity = activity))
}
override fun onActivityStopped(activity: Activity?) {
lifecycleLivaData.sendValue(LifecycleMessage(type = ApplicationManage.MessageType.MESSAGE_ACTIVITY_STOP, activity = activity))
}
override fun onActivityDestroyed(activity: Activity?) {
lifecycleLivaData.sendValue(LifecycleMessage(type = ApplicationManage.MessageType.MESSAGE_ACTIVITY_DESTROYED, activity = activity))
}
override fun onActivitySaveInstanceState(activity: Activity?, outState: Bundle?) {
lifecycleLivaData.sendValue(LifecycleMessage(type = ApplicationManage.MessageType.MESSAGE_ACTIVITY_SAVEINSTANCESTATE, activity = activity, savedInstanceState = outState))
}
})
}
}
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而後你們經過 ApplicationManage 實現註冊 observer
fun addObserver(tag: String? = null, lifecycle: Lifecycle? = null, observer: (lifecycleMessage: LifecycleMessage) -> Unit) {
lifecycleManage.lifecycleLivaData.addObserver(tag, lifecycle, observer)
}
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而後是使用
ApplicationManage.instance.addObserver { lifecycleMessage ->
when (lifecycleMessage.type) {
ApplicationManage.MessageType.MESSAGE_ACTIVITY_CREATE -> {
if (lifecycleMessage.activity != null) ScreenAutoManager.instance.onActivityCreated(lifecycleMessage.activity)
Log.d("AA", "MESSAGE_ACTIVITY_CREATE")
}
ApplicationManage.MessageType.MESSAGE_ACTIVITY_START -> {
if (lifecycleMessage.activity != null) ScreenAutoManager.instance.onActivityStarted(lifecycleMessage.activity)
Log.d("AA", "MESSAGE_ACTIVITY_START")
}
ApplicationManage.MessageType.MESSAGE_ACTIVITY_RESUME -> {
if (lifecycleMessage.activity != null) ScreenAutoManager.instance.onActivityResumed(lifecycleMessage.activity)
Log.d("AA", "MESSAGE_ACTIVITY_RESUME")
}
ApplicationManage.MessageType.MESSAGE_ACTIVITY_PAUSE -> Log.d("AA", "MESSAGE_ACTIVITY_PAUSE")
ApplicationManage.MessageType.MESSAGE_ACTIVITY_STOP -> Log.d("AA", "MESSAGE_ACTIVITY_STOP")
ApplicationManage.MessageType.MESSAGE_ACTIVITY_SAVEINSTANCESTATE -> Log.d("AA", "MESSAGE_ACTIVITY_SAVEINSTANCESTATE")
ApplicationManage.MessageType.MESSAGE_ACTIVITY_DESTROYED -> Log.d("AA", "MESSAGE_ACTIVITY_DESTROYED")
ApplicationManage.MessageType.MESSAGE_APP_START -> Log.d("AA", "MESSAGE_APP_START")
ApplicationManage.MessageType.MESSAGE_APP_EXIT -> Log.d("AA", "MESSAGE_APP_EXIT")
ApplicationManage.MessageType.MESSAGE_APP_FORNT -> Log.d("AA", "MESSAGE_APP_FORNT")
ApplicationManage.MessageType.MESSAGE_APP_BACKGROUD -> Log.d("AA", "MESSAGE_APP_BACKGROUD")
}
}
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能夠看到這裏 app 的啓動,退出,先後臺切換我也都發送相關的消息了
實現不難,思路就使用 livedata 在合適的位置轉發一下數據,官方的 Lifecycle 也是這個思路作的
我想你們都關心這個,相信你們也都有本身的實現,基本思路都是在 registerActivityLifecycleCallbacks 裏更新計數器判斷 app 狀態,這裏我也是同樣的,只不過多了一步罷了
我標識了 app 的3種狀態: app state 默認是 no - app沒啓動
val STATE_APP_NO: Int = 31
val STATE_APP_FORNT: Int = 32
val STATE_APP_BACKGROUD: Int = 33
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判斷邏輯以下:
注意:onActivityStarted 這個函數即表示 onStart,也表示 onRestart ,因此在計數時要更外當心,由於 start 的緣由 oncreate 不適合計數器++了,要不會和 start 重複
這樣咱們也能夠返回 app 當前的狀態了,不用再用 AM 來判斷了,AM 不少人反應部分手機無效,其實返回 app 狀態的這個小功能很是實用的,在推送時咱們要判斷 app 是否是啓來了,由於由不一樣的操做
我這裏思路很簡單,就是主界面下面墊一個透明無界面的 Activity,咱們想退出 app 時啓動這個 Activity,在 onNewIntent 裏面 finish 頁面就好了,不過這個功能有侵入行:
// 退出 app
ApplicationManage.instance.exitmanage.exitApp()
// 代理方法啓動主界面
ApplicationManage.instance.exitmanage.startActivityProxy(this, Intent(this@SplaseActivity, MainActivity::class.java))
// 屏蔽主界面返回按鍵默認操做
override fun onBackPressed() {
// super.onBackPressed()
}
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我知道你們都懶得看 demo,這代碼長也得貼出來
/** * 做者 : BloodCrown * 時間 : 2019-05-08 21:33 * 描述 : * application 封裝類,在方便提供 application 上下文對象的同時, * 也提供了一些功能 * * 功能 : * 1. Application 上下文代理,任何模塊都沒必要關心 application 具體的實現類型 * 有 ApplicationManage 在時刻都能獲取全局上下文對象 * * 2. 提供優雅退出 app 的功能,經過在主頁面下面添加一個透明的 activity + singleTask 實現優雅退出 * * 3. Application 的生命週期實現響應式,像 EventBus,RxBus 那樣響應消息就行,另外我還添加了 * app 啓動,退出,切入後臺,切回前臺的相應進來 * * 4. 在實現功能3時,實現了 app 當前狀態的保存,極大的方便了咱們在注入推送時判斷 app 是否啓動等操做 * * 最後說一點,我沒有使用 ActivityManage 來判斷 app 狀態,由於 ActivityManage 存在適配問題, * 總有那麼一小撮手機就是不配合,臣妾也是沒辦法呀~ * */
class ApplicationManage {
companion object Help {
// 餓漢式單例,加上同步限制,這樣能夠避免 application 操做類單例爲null 的狀況
val instance: ApplicationManage by lazy(LazyThreadSafetyMode.SYNCHRONIZED) {
return@lazy ApplicationManage()
}
// 標準初始化方法,
fun init(application: Application) {
instance.init(application)
}
}
// 全局上下文對象
var application: Application? = null
// 退出 app 工具類
var exitmanage: ExitManage = ExitManage()
// app 全局生命週期管理類,使用 livedata 實現,考慮其如果外部可見,就能使用他亂髮射數據,數據私有
private var lifecycleManage: LifecycleManage = LifecycleManage()
// app 狀態管理類,也是私有,這個實現絕對是不對外的,你們關心結果就行了,由 ApplicationManage 銜接
private var stateManage: StateManage = StateManage()
/** * 初始化方法私有,由靜態方法銜接 */
private fun init(application: Application) {
this.application = application
lifecycleManage.init(application)
stateManage.initStateManage(lifecycleManage)
}
/** * 添加監聽 */
fun addObserver(tag: String? = null, lifecycle: Lifecycle? = null, observer: (lifecycleMessage: LifecycleMessage) -> Unit) {
lifecycleManage.lifecycleLivaData.addObserver(tag, lifecycle, observer)
}
/** * 解綁 */
fun removeobserver(tag: String) {
lifecycleManage.lifecycleLivaData.removeOberver(tag)
}
/** * 獲取當前 app 狀態 */
fun getCurrentState(): Int {
return stateManage.STAET_CURRENT
}
/** * 消息類型 */
class MessageType {
companion object {
// 對應 activity 的生命週期
@JvmField
val MESSAGE_ACTIVITY_CREATE: Int = 11
@JvmField
val MESSAGE_ACTIVITY_RESUME: Int = 12
@JvmField
val MESSAGE_ACTIVITY_START: Int = 13
@JvmField
val MESSAGE_ACTIVITY_PAUSE: Int = 14
@JvmField
val MESSAGE_ACTIVITY_STOP: Int = 15
@JvmField
val MESSAGE_ACTIVITY_DESTROYED: Int = 16
@JvmField
val MESSAGE_ACTIVITY_SAVEINSTANCESTATE: Int = 17
// app 啓動,退出,切換到前臺,切換到後臺
@JvmField
val MESSAGE_APP_START: Int = 21
@JvmField
val MESSAGE_APP_EXIT: Int = 25
@JvmField
val MESSAGE_APP_FORNT: Int = 22
@JvmField
val MESSAGE_APP_BACKGROUD: Int = 23
}
}
}
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/** * 做者 : BloodCrown * 時間 : 2019-05-08 21:38 * 描述 : */
class LifecycleManage {
var lifecycleLivaData: MyLiveData<LifecycleMessage> = MyLiveData()
/** * 初始化方法 */
fun init(application: Application) {
registerActivityLifecycleCallbacks(application)
}
/** * 註冊 application 生命週期回調函數,在對應的函數回調中發射對應的消息 */
private fun registerActivityLifecycleCallbacks(application: Application) {
if (application == null) return
application.registerActivityLifecycleCallbacks(object : Application.ActivityLifecycleCallbacks {
override fun onActivityCreated(activity: Activity?, savedInstanceState: Bundle?) {
lifecycleLivaData.sendValue(LifecycleMessage(type = ApplicationManage.MessageType.MESSAGE_ACTIVITY_CREATE, activity = activity, savedInstanceState = savedInstanceState))
}
override fun onActivityStarted(activity: Activity?) {
lifecycleLivaData.sendValue(LifecycleMessage(type = ApplicationManage.MessageType.MESSAGE_ACTIVITY_START, activity = activity))
}
override fun onActivityResumed(activity: Activity?) {
lifecycleLivaData.sendValue(LifecycleMessage(type = ApplicationManage.MessageType.MESSAGE_ACTIVITY_RESUME, activity = activity))
}
override fun onActivityPaused(activity: Activity?) {
lifecycleLivaData.sendValue(LifecycleMessage(type = ApplicationManage.MessageType.MESSAGE_ACTIVITY_PAUSE, activity = activity))
}
override fun onActivityStopped(activity: Activity?) {
lifecycleLivaData.sendValue(LifecycleMessage(type = ApplicationManage.MessageType.MESSAGE_ACTIVITY_STOP, activity = activity))
}
override fun onActivityDestroyed(activity: Activity?) {
lifecycleLivaData.sendValue(LifecycleMessage(type = ApplicationManage.MessageType.MESSAGE_ACTIVITY_DESTROYED, activity = activity))
}
override fun onActivitySaveInstanceState(activity: Activity?, outState: Bundle?) {
lifecycleLivaData.sendValue(LifecycleMessage(type = ApplicationManage.MessageType.MESSAGE_ACTIVITY_SAVEINSTANCESTATE, activity = activity, savedInstanceState = outState))
}
})
}
}
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class LifecycleMessage(var type: Int, var activity: Activity? = null, var savedInstanceState: Bundle? = null) {
}
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/** * 做者 : BloodCrown * 時間 : 2019-05-09 21:32 * 描述 : */
class StateManage {
companion object stateType {
// 沒啓動,前臺,後臺
@JvmField
val STATE_APP_NO: Int = 31
@JvmField
val STATE_APP_FORNT: Int = 32
@JvmField
val STATE_APP_BACKGROUD: Int = 33
}
var STAET_CURRENT: Int = STATE_APP_NO
var aliveActivitys: Int = 0
fun initStateManage(lifecycleManage: LifecycleManage) {
if (lifecycleManage == null) return
addObserver(lifecycleManage)
}
/** * 添加管理器 */
private fun addObserver(lifecycleManage: LifecycleManage) {
if (lifecycleManage == null) return
lifecycleManage.lifecycleLivaData.addObserver {
when (it.type) {
ApplicationManage.MessageType.MESSAGE_ACTIVITY_CREATE -> {
// 標記是沒啓動,那麼觸發 create 必定是app 啓動
if (STAET_CURRENT == STATE_APP_NO) {
STAET_CURRENT = STATE_APP_FORNT
lifecycleManage.lifecycleLivaData.sendValue(LifecycleMessage(ApplicationManage.MessageType.MESSAGE_APP_START))
}
}
ApplicationManage.MessageType.MESSAGE_ACTIVITY_START -> {
// 活動 ac 數量爲0,而且當前標記是 app 在後臺,那麼此時觸發 start,那麼就是切會到前臺來了
if (aliveActivitys == 0 && STAET_CURRENT == STATE_APP_BACKGROUD) {
STAET_CURRENT = STATE_APP_FORNT
lifecycleManage.lifecycleLivaData.sendValue(LifecycleMessage(ApplicationManage.MessageType.MESSAGE_APP_FORNT))
}
aliveActivitys++
}
ApplicationManage.MessageType.MESSAGE_ACTIVITY_STOP -> {
aliveActivitys--
if (aliveActivitys == 0 && STAET_CURRENT == STATE_APP_FORNT) {
STAET_CURRENT = STATE_APP_BACKGROUD
lifecycleManage.lifecycleLivaData.sendValue(LifecycleMessage(ApplicationManage.MessageType.MESSAGE_APP_BACKGROUD))
}
}
ApplicationManage.MessageType.MESSAGE_ACTIVITY_DESTROYED -> {
if (aliveActivitys == 0) {
STAET_CURRENT = STATE_APP_NO
lifecycleManage.lifecycleLivaData.sendValue(LifecycleMessage(ApplicationManage.MessageType.MESSAGE_APP_EXIT))
}
}
}
}
}
}
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class ExitActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_exit)
}
override fun onNewIntent(intent: Intent?) {
super.onNewIntent(intent)
if (intent == null) return
val action: Int = intent.getIntExtra(ExitMessage.MESSAGE_ACTION, ExitMessage.ACTION_EXIT)
when (action) {
ExitMessage.ACTION_EXIT -> this@ExitActivity.finish()
else -> this@ExitActivity.finish()
}
}
}
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class ExitManage {
fun exitApp(): Boolean {
if (ApplicationManage.instance.application == null) return false
var intent = Intent(ApplicationManage.instance.application, ExitActivity::class.java)
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
ApplicationManage.instance.application?.startActivity(intent)
return true
}
fun exitAppBySystem() {
System.exit(0)
}
fun startActivityProxy(activity: Activity, intentYou: Intent) {
if (activity == null) return
var intentExit = Intent(activity, ExitActivity::class.java)
intentExit.putExtra(ExitMessage.MESSAGE_ACTION, ExitMessage.ACTION_EXIT)
activity.startActivity(intentExit)
activity.startActivity(intentYou)
}
}
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object ExitMessage {
val MESSAGE_ACTION: String = "message_action"
val ACTION_EXIT: Int = 101
}
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能看到這裏的都是至關給面子的了~
鎖屏,解鎖時我即使按照下面的設置設了
android:screenOrientation="portrait"
android:configChanges="orientation|screenSize|keyboardHidden"
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可是蛋疼的有的手機就是不給面子,仍是會走1-2遍 activity 銷燬,重建的過程,太蛋疼了,手頭的 meizu 16h就這樣,好在這樣的手機只是少部分,可是帶給咱們的影響就是先後臺切換的消息會走好幾回,這我也沒辦法,昨天下午一下午的時間就是在找資料搞訂這個,一下午的時間過去了也不行,算了就這樣吧,你們記得android 這啃爹玩意完事不是 100% 有些誤差就得了,我監聽鎖屏,解鎖廣播,發現最後才收到廣播,聲明周期函數早就執行完了,廣播纔來還有個P用啊
唉,一下午的時間身心俱疲啊~
我知道高玩們是看不上我這篇文章的,不噴我就是好的了,全當是自娛自樂吧