Question

我的应用程序没有抓住＆＃34; ACTION_USB_DEVICE_ATTACHED＆＃34;但是＆＃34; ACTION_USB_DEVICE_DETACHED＆＃34;工作得很好。如果我连接usb设备，应用程序就会正确启动，但在执行期间我会断开连接BroadcastReceiver右键捕获＆＃34; ACTION_USB_DEVICE_DETACHED＆＃34;。如果我再次附上BroadcastReceiver，请不要抓住任何内容。

    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");
    }
  }

并表明：

<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

除了变化之外，一切都如上所述。在我的研究中，singleTask in application标签没有帮助，但是当我把它放在活动标签

时有所帮助

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

它为我提供了ANDROID开始向活动发送onNewIntent。在onNewIntent上，我只需从意图中获取设备，没有任何权限请求：

@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);

Answer 2

另外添加此权限：）

<uses-feature android:name="android.hardware.usb.host" />
<uses-permission android:name="android.permission.USB_PERMISSION" />

Answer 3

还可以尝试添加<application android:launchMode="singleTask">。 USB_ACCESSORY_ATTACHED对我有用，也适用于你。

Answer 4

我能够通过以下方式解决此问题：

在“Launcher活动”

android:launchMode="singleTask"

在启动器活动中添加此意图过滤器

<intent-filter>
    <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
</intent-filter>

将元数据添加到启动器活动

<meta-data
    android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
    android:resource="@xml/device_filter" 
/>

覆盖Launcher活动中的OnNewIntent方法

protected void onNewIntent(Intent intent) {
    if(intent.getAction().equals(UsbManager.ACTION_USB_DEVICE_ATTACHED)){
        getPermission();
    }
};

现在，如果你要分离 - ＆gt;再次连接USB设备，onNewIntent()方法将被调用..

Answer 5

Android Reference for Activity说使用onNewIntent（）：

“这是为在其包中将launchMode设置为”singleTop“的活动调用的，或者在调用startActivity（intent）时客户端使用FLAG_ACTIVITY_SINGLE_TOP标志”

所以launchMode singleTop == singleTask？

Android：BroadcastReceiver在USB端口插入/移除设备USB插头时

5 个答案: