要解决Android中未收到UsbManager.ACTION_USB_DEVICE_DETACHED状态的事件,你可以按照以下步骤进行操作:
public class UsbReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
// 处理USB设备被拔出的逻辑
}
}
}
public class MainActivity extends AppCompatActivity {
private UsbReceiver usbReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 初始化和注册BroadcastReceiver
usbReceiver = new UsbReceiver();
IntentFilter filter = new IntentFilter();
filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
registerReceiver(usbReceiver, filter);
}
@Override
protected void onDestroy() {
super.onDestroy();
// 注销BroadcastReceiver
unregisterReceiver(usbReceiver);
}
}
通过上述步骤,你应该能够正确地接收到UsbManager.ACTION_USB_DEVICE_DETACHED状态的事件。确保设备已正确连接,并且需要与你的应用程序进行通信的USB设备已获得必要的权限。