检测设备被插入

本文介绍了检测设备被插入的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想能够检测设备是否插好。我希望能够只查询，同样的方式，我们可以为连接状态做。这是可能的还是我需要创建一个广播接收器监听电池事件？

I would like to be able to detect whether or not the device is plugged in. I would like to be able to just query that the same way we can do for the connectivity state. Is that possible or do I need to create a broadcast receiver that listens for the battery events?

推荐答案

显然，ACTION_BATTERY_CHANGED是一种持久广播，这意味着你可以注册并接受它已经播出后的任何时间。为了让你可以做这样的事情堵塞状态：

Apparently the ACTION_BATTERY_CHANGED is a "sticky broadcast" which means you can register for it and receive it any time after it has been broadcast. To get the plugged state you can do something like:

public void onCreate() { BroadcastReceiver receiver = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1); if (plugged == BatteryManager.BATTERY_PLUGGED_AC) { // on AC power } else if (plugged == BatteryManager.BATTERY_PLUGGED_USB) { // on USB power } else if (plugged == 0) { // on battery power } else { // intent didnt include extra info } } }; IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED); registerReceiver(receiver, filter); }