标签：android android-intent broadcastreceiver

我正在尝试在充电状态发生变化时在特定活动中显示警报.
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); 

}

}

以下是我从MainActivity的onResume实例化它的方法. MainActivity实现我的界面并覆盖onReceive(intent).我发现在任何阶段都没有intent.getIntExtra(BatteryManager.EXTRA_STATUS,-1)返回-1,然后返回-1.

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

解决方法:

Intent.ACTION_POWER_CONNECTED没有提供当前的插件状态 – 这可能是API工作方式的变化,但我无法在文档中找到任何提及此类更改的内容.

广播Intent.ACTION_POWER_CONNECTED从未打算接收当前的插件类型,但它只是让电源连接的接收端(ref.).实际上,BatteryService.java播放普通意图而没有任何额外的值(截至本文撰写时为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

<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);
    }
}

希望这可以帮助.

标签：android,android-intent,broadcastreceiver
来源： https://codeday.me/bug/20190831/1773904.html

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