Question

我需要知道我的Android设备是否正在充电以及是否已连接到usb，因此我使用以下代码：

    IntentFilter intentFilter;
    Intent intent;
    intentFilter= new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
    intent= mContext.registerReceiver(null, intentFilter);

    int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);   
    boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL;

    int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
    boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
    boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;

我的问题是：有时候，根据测试的设备，当设备显然连接到USB（我可以通过访问所有数据文件夹告诉），它仍然返回usbCharge = false。任何人都可以想到一个原因吗？我应该提到我总是使用相同的设备类型，只是不同的设备...

提前致谢...

Answer 1

@Override
public void onReceive(Context context, Intent intent) {
    Log.e("test","reciver");
    final Intent mIntent = context.getApplicationContext().registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
    int status = mIntent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
//        
//        boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
//                status == BatteryManager.BATTERY_STATUS_FULL;

    int chargePlug = mIntent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
    boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
    boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
    Log.e("test",usbCharge+"");
    Toast.makeText(context,usbCharge+"",Toast.LENGTH_SHORT).show();
//        Toast.makeText(context,acCharge+"",Toast.LENGTH_SHORT).show();
    }

检查电池状态/ USB插头是否一致

1 个答案: