获取栈顶应用

ForegroundAppUtil.kt

package cn.whdx.mdm.utils

import android.app.usage.UsageStats
import android.app.usage.UsageStatsManager
import android.content.Context
import android.text.TextUtils
import cn.bcbook.baselibrary.utils.LogUtil

/**
 * @author yyz (杨云召)
 * @date 2020-02-13
 * time   15:10
 * description
 * 判断某应用是否在前台工具类
 */
object ForegroundAppUtil {
    private val END_TIME = System.currentTimeMillis()
    private const val TIME_INTERVAL = 7 * 24 * 60 * 60 * 1000L
    private val START_TIME = END_TIME - TIME_INTERVAL

    /**
     * 获取栈顶Activity包名
     */
    private fun getForegroundActivityName(context: Context): String? {
        var usageStatsResult: UsageStats? = null
        val usageStatsList = getUsageStatsList(context)
        if (usageStatsList == null || usageStatsList.isEmpty()) return null
        for (usageStats in usageStatsList) {
            if (usageStatsResult == null || usageStatsResult.lastTimeUsed < usageStats.lastTimeUsed) {
                usageStatsResult = usageStats
            }
        }
        return usageStatsResult?.packageName
    }

    /**
     * 通过UsageStatsManager获取List<UsageStats>集合
     */
    private fun getUsageStatsList(context: Context): List<UsageStats>? {
        val manager = context.applicationContext
                .getSystemService(Context.USAGE_STATS_SERVICE) as UsageStatsManager
        //UsageStatsManager.INTERVAL_WEEKLY，UsageStatsManager的参数定义了5个，具体查阅源码
        val usageStatsList = manager.queryUsageStats(UsageStatsManager.INTERVAL_BEST, START_TIME, END_TIME)
        if (usageStatsList == null || usageStatsList.size == 0) {
            // 没有权限，获取不到数据
            return null
        }
        return usageStatsList
    }

    /**
     * 判断当前应用是否在前台
     */
    fun isForegroundApp(context: Context, packageName: String?): Boolean {
        if (packageName == null) return false
        val foregroundPackageName = getForegroundActivityName(context)
        LogUtil.d("AppStoreMdmReceiver", "栈顶包名为：$foregroundPackageName 传入包名为：$packageName")
        return TextUtils.equals(foregroundPackageName, packageName)
    }
}