Question

我在此抱着一点问题。

我希望我能做一些事情,但只是在电池组占10%的时候。

我不时看电池级;它只是等待LOW_BATTERY的意图。

如果某一职等没有规定,它就会运作3倍:15%、10%和5%

我只想做10%的事情。

我的法典如下:

public void onReceive(Context context, Intent intent) 
{
    if(intent.getAction().equals(ACTION_BATTERY_LOW))
    {
        int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 100);
        int percent = (level*100)/scale; 

        if(percent == 10)
        {
            // Do Something

        }
    }
}

Answer 1

ACTION_BATTERY_LOW doesn t have the Extras you re trying to read from it, so you re getting percent as -1 every time.

在<代码>后插入are<>/em>。行动: 广播。然而,这并不意味着,你只登记接受。 <>编码>ACTION_BATTERY_CHANGED为标签,因此registerReceiver (立即返回最后的Intent。这意味着你可以做这样的事情:

public void onReceive(Context context, Intent intent) { if(intent.getAction().equals(ACTION_BATTERY_LOW)) { IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED); Intent batteryStatus = context.registerReceiver(null, ifilter); int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1); int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, 100); int percent = (level*100)/scale; if (percent <= 10 && percent > 5) { // Do Something } } }

Note that registerReciever() was called with a null BroadcastReceiver, so you don t have to worry about unregistering. This is a nice, clean way to just say "What is the battery status right now?" (Well, technically, it s what was it last time a Broadcast was sent.)

Answer 2

In this case, you can use "ACTION_BATTERY_CHANGED"

    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {
            int level = intent.getIntExtra("level", 0);
            int scale = intent.getIntExtra("scale", 100);
            double batStatus = level * 100 / scale;
        }
    }

希望这将有助于你们。

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