kotlin实现最简单的Activity栈管理工具类

Posted 2022-12-09 事在人为，幸福从不抱怨开始！

/**
 * Activity栈任务管理器
 * 通常放在我们自定义Activity的基类中操作
 */
class AcitivityManager private constructor() 

    private val activityStack: Stack<Activity> = Stack()

    companion object 
        val instance: AcitivityManager by lazy  AcitivityManager() 
    

    /**
     * 添加Activity
     */
    fun addActivity(activity: Activity) 
        activityStack.add(activity)
    

    /**
     * 移出存在的Activity
     */
    fun removeActivity(activity: Activity) 
        if (activityStack.contains(activity)) 
            activity.finish()
            activityStack.remove(activity)
        
    

    /**
     * 获取最上面的Activity
     */
    fun getTopActivity(): Activity 
        return activityStack.lastElement()
    

    /**
     * 清除Activity栈
     */
    fun clearActivity() 
        for (activity in activityStack) 
            activity.finish()
        
        activityStack.clear()
    

    /*
        退出应用程序
     */
    fun exitApp(context: Context) 
        //先清除Activity
        clearActivity()
        val activityManager = context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
        //再killProcesses
        activityManager.killBackgroundProcesses(context.packageName)
        System.exit(0)
    

在Activity的基类中使用

class BaseActivity:Activity() 
    override fun onCreate(savedInstanceState: Bundle?) 
        super.onCreate(savedInstanceState)
        //onCreate中入栈
        AcitivityManager .instance.addActivity(this)
    

    override fun onDestroy() 
        super.onDestroy()
        //onDestroy中入移除
        AcitivityManager .instance.removeActivity(this)