Android Activity 启动模式

Standard 启动模式

页面跳转顺序

MainActivity -> StandardActivity -> StandardActivity -> StandardActivity

页面栈 示例图 

任务栈中只存在MainActivity时

任务栈中存在MainActivity、StandardActivity

MainActivity -> StandardActivity 

 MainActivity -> StandardActivity -> StandardActivity 

MainActivity -> StandardActivity -> StandardActivity -> StandardActivity

通过ActivityManager查看页面栈

通过以下函数获取任务栈ID 、栈中Activity数量、栈底Activity、栈顶Activity、栈中所有Activity

import android.app.Activity
import android.app.ActivityManager
import android.content.Context
import android.util.Log
import java.util.LinkedList


class Util {
    companion object {
        private val tag = Util::class.simpleName

        val inactiveActivities = LinkedList<Activity>()

        @JvmStatic
        fun getAllActivity(context: Context) {
            val activityManager = context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager?
            val taskList = activityManager!!.getRunningTasks(1) // todo 获取最近运行的1个任务
            for (taskInfo in taskList) {
                // todo 获取栈顶Activity
                val topComponentName = taskInfo.topActivity
                // todo 获取栈底Activity
                val baseComponentName = taskInfo.baseActivity
                // todo 获取栈中Activity 数量
                val numActivity = taskInfo.numActivities
                // todo 获取任务ID
                val taskId = taskInfo.taskId

                Log.i(tag, "$tag 当前任务栈...... 任务ID\t$taskId")
                Log.i(tag, "$tag 当前任务栈...... 栈中Activity数量\t$numActivity")
                if (baseComponentName != null) {
                    Log.i(tag, "$tag 当前任务栈...... 栈底Activity:\t${baseComponentName.className}")
                }
                if (topComponentName != null) {
                    Log.i(tag, "$tag 当前任务栈...... 栈顶Activity:\t${topComponentName.className}")
                }
                // todo 栈中所有Activity名称
                val activities= getInactiveActivities()
                Log.i(tag, "$tag 当前任务栈...... 所有Activity:\t$activities")
                Log.i(tag, "$tag 当前任务栈.....................................................")
            }
        }
        
        // todo 获取栈中所有Activity
        @JvmStatic
        fun getInactiveActivities(): List<Activity> {
            return inactiveActivities.toList()
        }

    }
}

注册监听所有Activity的事件

Application.ActivityLifecycleCallbacks是Application中的一个接口，调用registerActivityLifecycleCallbacks方法即可完成注册。用于全局监听每个Activity的生命周期、判断app前后状态等作用。

import android.app.Activity
import android.app.Application
import android.os.Bundle
import com.start.util.Util

class MyApplication : Application() {

    override fun onCreate() {
        super.onCreate()
        registerActivityLifecycleCallbacks(object : ActivityLifecycleCallbacks {
            override fun onActivityResumed(activity: Activity) {

            }

            override fun onActivityPaused(activity: Activity) {}

            override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {
                // todo 当Activity创建时，添加到列表中
                if (!Util.inactiveActivities.contains(activity)) {
                    Util.inactiveActivities.add(activity)
                }
                Util.getAllActivity(baseContext)
            }
            override fun onActivityStarted(activity: Activity) {}
            override fun o