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android实现定时任务有很多种方式,为什么选择了AlarmManager + BroadcastReceiver呢?
因为AlarmManager是系统级别的闹钟服务,如果你的项目存在长时间在后台运行的定时任务,因为Android设备有自己的休眠策略,当长时间的无操作,设备会自动让CPU进入 休眠状态
,这样就可能导致Timer中的定时任务无法正常运行!而AlarmManager
则不存在这种情况,因为AlarmManager
具有唤醒CPU的功能,可以保证每次需要执行特定任务时CPU都能正常工作。
正因如此,我将AlarmManager + BroadcastReceiver封装成一个TimeTask
,可直接复制使用。
增加权限~~
<uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM" />
class TimeTask<T : TimeTask.Task?>(context: Context, actionName: String, task: T) private var mContext: Context? private val mActionName: String private var mReceiver: TimeTaskReceiver? = null private val mTask: T? companion object private var mPendingIntent: PendingIntent? = null init mContext = context mActionName = actionName mTask = task initReceiver(context, actionName) fun startLooperTask() if (null != mTask) mTask.exeTask() configureAlarmManager(mTask.period()) fun stopLooperTask() cancelAlarmManager() fun onClose() mContext!!.unregisterReceiver(mReceiver) mContext = null @SuppressLint("ObsoleteSdkInt") private fun configureAlarmManager(time: Long) val manager = mContext!!.getSystemService(Context.ALARM_SERVICE) as AlarmManager val pendIntent = pendingIntent when Build.VERSION.SDK_INT >= Build.VERSION_CODES.M -> manager.setExactAndAllowWhileIdle( AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + time, pendIntent ) Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT -> manager.setExact( AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + time, pendIntent ) else -> manager[AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + time] = pendIntent @get:SuppressLint("UnspecifiedImmutableFlag") private val pendingIntent: PendingIntent? get() if (mPendingIntent == null) val requestCode = 0 val intent = Intent() intent.action = mActionName when Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> mPendingIntent = PendingIntent.getBroadcast( mContext, requestCode, intent, PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_MUTABLE ) else -> mPendingIntent = PendingIntent.getBroadcast( mContext, requestCode, intent, PendingIntent.FLAG_UPDATE_CURRENT ) return mPendingIntent private fun cancelAlarmManager() val manager = mContext!!.getSystemService(Context.ALARM_SERVICE) as AlarmManager manager.cancel(pendingIntent) private fun initReceiver(context: Context, actionName: String) mReceiver = TimeTaskReceiver() val intentFilter = IntentFilter() intentFilter.addAction(actionName) context.registerReceiver(mReceiver, intentFilter) internal inner class TimeTaskReceiver : BroadcastReceiver() override fun onReceive(context: Context, intent: Intent) startLooperTask() interface Task fun period(): Long // 默认时间5S return 5000L fun exeTask()
使用方式
//比如在Activity中class GatewayActivity : AppCompatActivity() private lateinit var tt : TimeTask<TimeTask.Task> override fun onCreate(savedInstanceState: Bundle?) super.onCreate(savedInstanceState) setContentView(R.layout.activity_gateway) tt = TimeTask(this, "abc", object : TimeTask.Task override fun exeTask() LogUtils.debugInfo("exeTask>>>>>>>>>>>>") ) findViewById<TextView>(R.id.tv).setOnClickListener tt.startLooperTask() findViewById<TextView>(R.id.tvs).setOnClickListener tt.stopLooperTask() override fun onDestroy() super.onDestroy() tt.onClose()
注意!!!
如果需要修改定时任务的时间间隔,可以重写TimeTask.Task
中的period()
方法:
tt = TimeTask(this, "abc", object : TimeTask.Task // 从API 19开始,最小执行时间是5S,如果小于5S,则设置无效,还是按照5S周期执行 override fun period(): Long return 10000L override fun exeTask() LogUtils.debugInfo("exeTask>>>>>>>>>>>>") )
日志打印,Android 9 & Android 12测试输出:
2022-05-03 13:46:26.188 22817-22817/com.jon.gateway D/JetpackMvvm: exeTask>>>>>>>>>>>>2022-05-03 13:46:36.224 22817-22817/com.jon.gateway D/JetpackMvvm: exeTask>>>>>>>>>>>>2022-05-03 13:46:46.244 22817-22817/com.jon.gateway D/JetpackMvvm: exeTask>>>>>>>>>>>>2022-05-03 13:46:56.256 22817-22817/com.jon.gateway D/JetpackMvvm: exeTask>>>>>>>>>>>>2022-05-03 13:47:06.270 22817-22817/com.jon.gateway D/JetpackMvvm: exeTask>>>>>>>>>>>>2022-05-03 13:47:16.283 22817-22817/com.jon.gateway D/JetpackMvvm: exeTask>>>>>>>>>>>>
非常感谢你能看到最后,如果能够帮助到你,是我的荣幸!
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