Question

我知道通过使用意图过滤器可以获得WiFi和蓝牙的功能 - ＆gt; ACTION_ACL_CONNECTED，ACTION_ACL_DISCONNECT_REQUESTED和ACTION_ACL_DISCONNECTED ......但是通常有什么东西可以检查是否已删除任何类型的连接设备。例如：我已将我的Android设备连接到我的Mac，现在智能手机已锁定，我删除了与我的Mac的连接，我可以触发本地推送或声音或此方向......

更新

尝试了@Rajesh Gopu的回答，看起来不错，但遗憾的是没有工作：（

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    IntentFilter filter = new IntentFilter();
    filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
    filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
    registerReceiver(mUsbReceiver, filter); //register
    Toast.makeText(getApplicationContext(), "ON CREATE", Toast.LENGTH_LONG).show();

}

// BroadcastReceiver when insert/remove the device USB plug into/from a USB port
BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {//get Event
        Toast.makeText(getApplicationContext(), "ON RECEIVE", Toast.LENGTH_LONG).show();

        String action = intent.getAction();
        System.out.println("BroadcastReceiver Event");
        if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
            Toast.makeText(getApplicationContext(), "CONNECTED", Toast.LENGTH_LONG).show();
            System.out.println("BroadcastReceiver USB Connected");
        } else if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
            Toast.makeText(getApplicationContext(), "DISCONNECTED", Toast.LENGTH_LONG).show();
            System.out.println("BroadcastReceiver USB Disconnected");
        }
    }
};
}

Answer 1

Use Broadcaster receiver , Android system informs the internel events by brodcasting it . THis can be received by App's by registering the action with broadcastrecever .

Below is an exmaple to recive usb connect/disconnect event.

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

  // BroadcastReceiver when insert/remove the device USB plug into/from a USB port  
  BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
  public void onReceive(Context context, Intent intent) {//get Event
    String action = intent.getAction();
    System.out.println("BroadcastReceiver Event");
    if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
        System.out.println("BroadcastReceiver USB Connected");
    } else if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
        System.out.println("BroadcastReceiver USB Disconnected");
    }
  }

}

有没有办法确定是否已删除任何类型的外围设备？

1 个答案: