如何检测USB设备的Android [英] How to detect USB device in Android
本文介绍了如何检测USB设备的Android的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有USB主机的Android设备为我需要连接USB设备。检测到USB设备主机I以下code写的。
I have USB host android device for that I need to connect USB device. to detect usb device to host I written following code.
public class ReadData extends Activity {
UsbManager usbManager;
PendingIntent mPermissionIntent;
UsbDevice usbDevice;
Intent intent;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_read_data);
usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
final String ACTION_USB_PERMISSION =
"com.example.udevice.USB_PERMISSION";
IntentFilter filter = new IntentFilter("android.hardware.usb.action.USB_ACCESSORY_ATTACHED");
registerReceiver(mUsbReceiver, filter);
}
private static final String ACTION_USB_PERMISSION =
"com.example.udevice.USB_PERMISSION";
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
usbDevice = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
usbManager.requestPermission(usbDevice, mPermissionIntent);
if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
if(usbDevice != null){
//call method to set up device communication
int deviceId = usbDevice.getDeviceId();
int productId = usbDevice.getProductId();
Log.i("device id", "****"+deviceId);
Log.i("product id", "****"+productId);
}else{
Log.i("device id", "No USB device");
}
}
else {
Log.d("shiv", "permission denied for device ");
}
}
}
}
};
和清单是象下面这样:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.udevice"
android:versionCode="1"
android:versionName="1.0" >
<uses-feature android:name="android.hardware.usb.host" />
<uses-sdk
android:minSdkVersion="12"
android:targetSdkVersion="15" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".ReadData"
android:label="@string/title_activity_heat_con" >
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
android:resource="@xml/device_filter" />
</activity>
</application>
</manifest>
device_filter.xml
device_filter.xml
<resources>
<usb-device vendor-id="67b"
product-id="2303"/>
</resources>
在上面的XML文件中我添加的设备属性。我期待,每当USB设备连接到主机设备的广播意图。但它没有发生。有什么不对上述code。
in above xml file I added device attributes. I am expecting a broadcast intent whenever USB device connected to host device. but it is not happening. What is wrong with above code.
谢谢 希夫
推荐答案
我想你需要添加:
<intent-filter>
<action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
</intent-filter>
据这里描述
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