usbManager类没有setDevicePermission方法 示例代码靠点谱啊
时间: 2024-02-17 16:05:10 浏览: 20
对不起,我之前说的话可能有误导性。确实,USBManager类没有setDevicePermission方法。如果您需要授予USB设备权限,您可以使用以下代码:
首先,您需要在您的AndroidManifest.xml文件中添加以下权限:
```xml
<uses-feature android:name="android.hardware.usb.host" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_USB" />
```
然后,在您的Activity中,您可以使用以下代码来获取USB权限:
```java
private static final String ACTION_USB_PERMISSION = "com.example.USB_PERMISSION";
private PendingIntent mPermissionIntent;
UsbManager usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = usbManager.getDeviceList();
Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
while(deviceIterator.hasNext()) {
UsbDevice device = deviceIterator.next();
PendingIntent permissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
usbManager.requestPermission(device, permissionIntent);
}
```
当USB设备被插入时,您将自动收到一个广播,您可以在BroadcastReceiver中处理该广播:
```java
private BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
if(device != null){
//在这里处理已经授权的设备
}
}
else {
Log.d(TAG, "permission denied for device " + device);
}
}
}
}
};
```
请注意,您需要在AndroidManifest.xml文件中注册该BroadcastReceiver:
```xml
<receiver android:name=".MyBroadcastReceiver" >
<intent-filter>
<action android:name="com.example.USB_PERMISSION" />
</intent-filter>
</receiver>
```
希望这能帮助您解决问题。如果您有任何其他问题,请随时问我。