电池广播接收器不工作 [英] Battery broadcast receiver doesn't work
问题描述
我不知道为什么,但我的电池广播接收机无法正常工作。
I don't know why, but my battery broadcast receiver doesn't work.
AndroidManifest.xml中
AndroidManifest.xml
<receiver android:name=".BatteryReceiver" android:enabled="true">
<intent-filter>
<action android:name="android.intent.action.BATTERY_CHANGED" />
<action android:name="android.intent.action.BATTERY_LOW" />
</intent-filter>
</receiver>
BatteryReceiver.java
BatteryReceiver.java
public class BatteryReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
int level = intent.getIntExtra( "level", 0 );
Log.d("Battery", "level: "+level);
Toast.makeText(context, "Battery low!", Toast.LENGTH_LONG).show();
}
}
什么是错我的code?
我使用控制台(远程登录)更改电池电量(电源容量X)。
What is wrong with my code? I'm using console (telnet) to change battery level (power capacity X).
推荐答案
有几个问题;我粗略地通过降低严重性命令他们:
There are several issues; I've ordered them roughly by decreasing severity:
-
您不能注册为
ACTION_BATTERY_CHANGED
从你的清单;您的必须的编程方式注册吧。
You can't register for
ACTION_BATTERY_CHANGED
from your Manifest; you must register for it programmatically.
不要使用 BATTERY_STATS
许可;这是完全无关的。
Don't use the BATTERY_STATS
permission; it's completely unrelated.
如果你在同一个广播接收器接收多个广播(即使你不是它通常是一个好主意),你应该检查,看看哪些广播你刚刚收到的。 ACTION_BATTERY_LOW
不应该以同样的方式对待 ACTION_BATTERY_CHANGED
。 (一方面,它不具备 BatteryManager.EXTRA_LEVEL
额外重视它,所以想读它会给你默认值, 0
)
If you're receiving more than one Broadcast in the same BroadcastReceiver (and it's generally a good idea even if you're not) you should check to see which Broadcast you've just received. ACTION_BATTERY_LOW
should not be treated in the same way as ACTION_BATTERY_CHANGED
. (For one thing, it doesn't have the BatteryManager.EXTRA_LEVEL
Extra attached to it, so trying to read it will give you your default value, 0
.)
您应该使用 1
为默认值,如 0
不是一个有效的值。
You should use -1
as your default value, not a valid value like 0
.
您应该检查,看看您是否已经收到了默认值,并适当地处理它。
You should check to see if you've received the default value and handle it appropriately.
您应该使用 BatteryManager.EXTRA_LEVEL
,而不是硬编码级别。
You should use BatteryManager.EXTRA_LEVEL
rather than hard-coding "level".
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