检查设备是否已插入

Question

我的应用程序有一个广播接收器来监听更改ACTION_POWER_CONNECTED,并反过来标记屏幕保持.

我缺少的是应用程序在首次运行时检查充电状态的能力.谁能帮我用代码手动检查充电状态？

Answer 1

感谢CommonsWare,这里是我写的代码.

public class Power {
    public static boolean isConnected(Context context) {
        Intent intent = context.registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
        int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
        return plugged == BatteryManager.BATTERY_PLUGGED_AC || plugged == BatteryManager.BATTERY_PLUGGED_USB || plugged == BatteryManager.BATTERY_PLUGGED_WIRELESS;
    }
}

if (Power.isConnected(context)) {
    ...
}

或Kotlin版本

object Power {
    fun isConnected(context: Context): Boolean {
        val intent = context.registerReceiver(null, IntentFilter(Intent.ACTION_BATTERY_CHANGED))
        val plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1)
        return plugged == BatteryManager.BATTERY_PLUGGED_AC || plugged == BatteryManager.BATTERY_PLUGGED_USB || plugged == BatteryManager.BATTERY_PLUGGED_WIRELESS
    }
}

http://developer.android.com/training/monitoring-device-state/battery-monitoring.html

Answer 2

public static boolean isPlugged(Context context) {
    boolean isPlugged= false;
    Intent intent = context.registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
    int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
    isPlugged = plugged == BatteryManager.BATTERY_PLUGGED_AC || plugged == BatteryManager.BATTERY_PLUGGED_USB;
    if (VERSION.SDK_INT > VERSION_CODES.JELLY_BEAN) {
        isPlugged = isPlugged || plugged == BatteryManager.BATTERY_PLUGGED_WIRELESS;
    }
    return isPlugged;
}

支持无线充电的小更新.

Answer 3

打电话registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED)).这将返回一个Intent已定义的额外内容,BatteryManager以告知您是否已插入.

这是因为Intent.ACTION_BATTERY_CHANGED是一个粘性广播.

Answer 4

在Android M +上，您可以BatteryManager通过来使用该服务getSystemService(BATTERY_SERVICE)。在运行pre-M的设备上，您可以使用其他人提到的即时广播。例：

public static boolean isCharging(Context context) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        BatteryManager batteryManager = (BatteryManager) context.getSystemService(Context.BATTERY_SERVICE);
        return batteryManager.isCharging();
    } else {
        IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        Intent intent = context.registerReceiver(null, filter);
        int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
        if (status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL) {
            return true;
        }
    }
    return false;
}

Answer 5

你的答案是在 android参考!

这是示例代码:

// Are we charging / charged?
int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
                 status == BatteryManager.BATTERY_STATUS_FULL;

// How are we charging?
int chargePlug = batteryStatus.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;

Answer 6

简单的方法是使用意图过滤器 ACTION_BATTERY_CHANGED

public void checkBatteryState(View sender) {
    IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
    Intent batteryStatus = registerReceiver(null, filter);

    int chargeState = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
    String strState;

    switch (chargeState) {
        case BatteryManager.BATTERY_STATUS_CHARGING:
        case BatteryManager.BATTERY_STATUS_FULL:
            strState = "charging";
            break;
        default:
            strState = "not charging";
    }

    TextView tv = (TextView) findViewById(R.id.textView);
    tv.setText(strState);
}