Android:将设备USB插入/拔出USB端口时的BroadcastReceiver

Question

我的应用程序没有捕捉到“ACTION_USB_DEVICE_ATTACHED”，但“ACTION_USB_DEVICE_DETACHED”工作正常。如果我连接 USB 设备但我在执行 BroadcastReceiver 时断开连接，应用程序会正确启动，正确捕获“ACTION_USB_DEVICE_DETACHED”。如果我再次附加 BroadcastReceiver，则不会捕获任何内容。

    IntentFilter filter = new IntentFilter();
filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
rocrailService.registerReceiver(mUsbReceiver, filter);


  // BroadcastReceiver when insert/remove the device USB plug into/from a USB port  
  BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
  public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();
    System.out.println("BroadcastReceiver Event");
    if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
        mSerial.usbAttached(intent);
        mSerial.begin(mBaudrate);
        loadDefaultSettingValues();
        Run=true;
        start();
        System.out.println("BroadcastReceiver USB Connected");

    } else if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
        mSerial.usbDetached(intent);
        mSerial.end();
        Run=false;
        System.out.println("BroadcastReceiver USB Disconnected");
    }
  }

和 list :

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="net.DCCWLocoDisplay"
android:versionCode="0"
android:versionName="0" >

<uses-sdk android:targetSdkVersion="12"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE"/>
<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>   
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

<application
    android:icon="@drawable/dccw"
    android:label="@string/app_name" >
    <activity android:icon="@drawable/cab_64" android:name="net.DCCWLocoDisplay.activities.ActRCCab" android:theme="@style/FullHeightMainDialog" android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
        <intent-filter>
            <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
        </intent-filter>
            <meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" 
               android:resource="@xml/device_filter" />      
    </activity>
    <activity android:name="net.DCCWLocoDisplay.activities.ActPreferences" android:theme="@style/FullHeightDialog" />
    <activity android:name="net.DCCWLocoDisplay.activities.ActAccessory" android:theme="@style/FullHeightDialog" />
    <activity android:name="net.DCCWLocoDisplay.activities.ActAbout" android:theme="@style/FullHeightDialog" />
    <activity android:name="net.DCCWLocoDisplay.activities.ActProgramming" android:theme="@style/FullHeightDialog" />
    <activity android:name="net.DCCWLocoDisplay.activities.ActSteps" android:theme="@style/FullHeightDialog" />
    <service android:name="net.DCCWLocoDisplay.DCCWLocoDisplay"/>
    </application>

 </manifest>

设备过滤器(我检查供应商和产品 ID):

<resources>
<!-- 0x0403 / 0x6001: FTDI FT232R UART -->
<usb-device vendor-id="1027" product-id="24577" /> <!-- FT232RL -->
</resources>

Answer 1

一切都像上面描述的那样工作，除了一些小的变化!在我的研究中，应用程序标签中的 singleTask 没有帮助，但是当我把它放在 Activity 标签中时有帮助

<activity
...
android:launchMode="singleTask">

它为我提供了 ANDROID 开始向 Activity 发送 onNewIntent。在 onNewIntent 上，我只需要从 Intent 中获取设备，而无需任何权限请求:

@Override
protected void onNewIntent(Intent intent)
{
    super.onNewIntent(intent);
    if(intent.getAction().equals(UsbManager.ACTION_USB_DEVICE_ATTACHED))
    {
        UsbDevice device  = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);