我正尝试在充电状态发生变化时在特定 Activity 中显示警报。 这是我的接收器类:

public class BatteryChargeReceiver extends BroadcastReceiver {
private String TAG = "receiver";
private ChargeReceiverCallback callback;

public BatteryChargeReceiver(ChargeReceiverCallback callback) {

    this.callback =callback;
    Log.v(TAG,"Inside  Constructor (Callback)");
}

public interface ChargeReceiverCallback {
    public void onReceive(Intent intent);
}

@Override
public void onReceive(Context context, Intent intent) {
    callback.onReceive(intent); 

}

下面是我如何从 MainActivity 的 onResume 实例化它。 MainActivity 实现我的接口(interface)并覆盖 onReceive(intent)。我发现 intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1) 在任何阶段都不会返回 -1 之后的任何其他内容。

BatteryChargeReceiver batteryReceiver = new BatteryChargeReceiver(this);
    IntentFilter filterPower = new IntentFilter("android.intent.action.ACTION_POWER_CONNECTED");
    registerReceiver(batteryReceiver, filterPower);

最佳答案

Intent.ACTION_POWER_CONNECTED 未提供当前插入状态 - 这可能是 API 工作方式的变化，但我在文档中找不到任何提及此类变化的地方。

广播 Intent.ACTION_POWER_CONNECTED 从来没有打算接收当前的插入类型，但它只是让接收端连接电源 ( ref. )。事实上，BatteryService.java广播没有任何额外值的简单 Intent (撰写本文时第 410~412 行):

Intent statusIntent = new Intent(Intent.ACTION_POWER_CONNECTED);
statusIntent.setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
mContext.sendBroadcastAsUser(statusIntent, UserHandle.ALL);

但是，下面的代码是

<uses-sdk
    android:minSdkVersion="10"
    android:targetSdkVersion="19" />

在 Nexus 5 上工作:

public class MainActivity extends Activity {
    private static final String TAG = "PowerReceiver";

    private final BroadcastReceiver mPowerReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();
            if (Intent.ACTION_POWER_CONNECTED.equals(action)) {
                Log.d(TAG, "Power connected");
                checkPluggedState(context, intent);
            } else if (Intent.ACTION_POWER_DISCONNECTED.equals(action)) {
                Toast.makeText(context, "Power disconnected", Toast.LENGTH_SHORT).show();
            } else {
                Log.wtf(TAG, "Unknown action: " + action);
            }
        }
    };

    private void checkPluggedState(Context context, Intent intent) {
        Intent chargingIntent = registerReceiver(null, new IntentFilter(
                Intent.ACTION_BATTERY_CHANGED));
        final int pluggedState = chargingIntent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
        final String msg;
        switch (pluggedState) {
            case 0:
                msg = "The device is running on battery";
                break;
            case BatteryManager.BATTERY_PLUGGED_AC:
                msg = "Plugged into AC charger";
                break;
            case BatteryManager.BATTERY_PLUGGED_USB:
                msg = "Plugged into USB charger";
                break;
            case BatteryManager.BATTERY_PLUGGED_WIRELESS:
                msg = "Plugged into wireless charger";
                break;
            default:
                msg = "Unknown state: " + pluggedState;
        }

        Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    protected void onResume() {
        super.onResume();

        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_POWER_CONNECTED);
        filter.addAction(Intent.ACTION_POWER_DISCONNECTED);
        registerReceiver(mPowerReceiver, filter);
    }

    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(mPowerReceiver);
    }
}

希望这对您有所帮助。

关于android Charge intent 没有额外数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20833241/