android - 当 android 触发 ACTION_BATTERY_LOW

Question

在我的应用程序中，我想在电池电量不足时做一些事情。当电池电量低时，android 会触发 ACTION_BATTERY_LOW，当电池再次达到良好状态时，它会触发 intent ACTION_BATTERY_OKAY。因此，我对此有三个问题:

1.android 在多少电池百分比下实际触发 ACTION_BATTERY_LOW？

2.如果电池电量更低，它会重复触发相同的事件吗？

3.我们可以配置 android 触发 ACTION_BATTERY_LOW intent 的电池百分比吗？

我比较关心第三点。

Answer 1

不，您无法设置何时发送 ACTION_BATTERY_LOW 阈值。这是由 Android ROM 指定的系统级 Intent 。这是在电池服务中设置值的代码:

mLowBatteryWarningLevel = mContext.getResources().getInteger(
            com.android.internal.R.integer.config_lowBatteryWarningLevel);

Battery Service更新方法中Android系统代码截取如下代码:

/* The ACTION_BATTERY_LOW broadcast is sent in these situations:
         * - is just un-plugged (previously was plugged) and battery level is
         *   less than or equal to WARNING, or
         * - is not plugged and battery level falls to WARNING boundary
         *   (becomes <= mLowBatteryWarningLevel).
         */
        final boolean sendBatteryLow = !plugged
            && mBatteryStatus != BatteryManager.BATTERY_STATUS_UNKNOWN
            && mBatteryLevel <= mLowBatteryWarningLevel
            && (oldPlugged || mLastBatteryLevel > mLowBatteryWarningLevel);

        sendIntent();

        // Separate broadcast is sent for power connected / not connected
        // since the standard intent will not wake any applications and some
        // applications may want to have smart behavior based on this.
        Intent statusIntent = new Intent();
        statusIntent.setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
        if (mPlugType != 0 && mLastPlugType == 0) {
            statusIntent.setAction(Intent.ACTION_POWER_CONNECTED);
            mContext.sendBroadcast(statusIntent);
        }
        else if (mPlugType == 0 && mLastPlugType != 0) {
            statusIntent.setAction(Intent.ACTION_POWER_DISCONNECTED);
            mContext.sendBroadcast(statusIntent);
        }

        if (sendBatteryLow) {
            mSentLowBatteryBroadcast = true;
            statusIntent.setAction(Intent.ACTION_BATTERY_LOW);
            mContext.sendBroadcast(statusIntent);