BatteryManager统计数据无法在Android上运行

Question

我正在尝试使用BroadCastReceiver获取击球手级别：

int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 0);

我已将以下权限添加到AndroidManifest.xml：

<uses-permission android:name="android.permission.BATTERY_STATS" />

当我打印关卡和刻度时，我看到默认值为0.是否有其他设置？

Answer 1

Calculating Battery Level in %:

您可以通过提取当前电池电量来查找当前电池电量，并根据电池状态意图进行缩放，如下所示：

int level = battery.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = battery.getIntExtra(BatteryManager.EXTRA_SCALE, -1);

float batteryPct = level / (float)scale;

像这样实现BroadcastReceiver：

 BroadcastReceiver mybatteryReceiver= new BroadcastReceiver() {
            public void onReceive(Context context, Intent intent) {
                int rawlevel = intent.getIntExtra("level", -1);
                int scale = intent.getIntExtra("scale", -1);
                int level = -1;
                if (rawlevel >= 0 && scale > 0) {
                    level = (rawlevel * 100) / scale;
                }
                Log.d("TEMP","Battery Level in % is:: " + level + "%");
            }
        };

从这里获取代码经过试用和测试。工作正常。

https://www.dropbox.com/s/1y6q5wu526ngz7t/BatteryStats.zip

代码结果：

Answer 2

获取电池充电状态无需许可只需在广播接收器中使用以下代码： -

int level = intent.getIntExtra（BatteryManager.EXTRA_LEVEL，0）;

这将导致电池电量：）