UsbHelper: Add additional methods for device enumeration and monitoring

[sigrok-androidutils.git] / src / org / sigrok / androidutils / UsbEventMonitor.java

diff --git a/src/org/sigrok/androidutils/UsbEventMonitor.java b/src/org/sigrok/androidutils/UsbEventMonitor.java
new file mode 100644 (file)
index 0000000..2ca5d63
--- /dev/null
+++ b/src/org/sigrok/androidutils/UsbEventMonitor.java
@@ -0,0 +1,107 @@
+/*
+ * This file is part of the sigrok-androidutils project.
+ *
+ * Copyright (C) 2016 Marcus Comstedt <marcus@mc.pp.se>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sigrok.androidutils;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.hardware.usb.UsbDevice;
+import android.hardware.usb.UsbManager;
+import android.util.Log;
+
+final class UsbEventMonitor
+{
+       private final Context context;
+       private final UsbManager manager;
+       private final UsbEventListener listener;
+       private final BroadcastReceiver permReceiver;
+       private final BroadcastReceiver hotplugReceiver;
+       private final IntentFilter permFilter;
+       private final IntentFilter hotplugFilter;
+
+       UsbEventMonitor(Context context, UsbManager manager, UsbEventListener listener)
+       {
+               this.context = context;
+               this.manager = manager;
+               this.listener = listener;
+               permReceiver = new BroadcastReceiver() {
+                       @Override
+                       public void onReceive(Context context, Intent intent) {
+                               String action = intent.getAction();
+                               if (UsbSupplicant.ACTION_USB_PERMISSION.equals(action)) {
+                                       permissionCallback((UsbDevice)intent.getParcelableExtra(
+                                               UsbManager.EXTRA_DEVICE), intent.getBooleanExtra(
+                                               UsbManager.EXTRA_PERMISSION_GRANTED, false));
+                               }
+                       }
+               };
+               hotplugReceiver = new BroadcastReceiver() {
+                       @Override
+                       public void onReceive(Context context, Intent intent) {
+                               if (intent != null && UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(intent.getAction())) {
+                                       attachCallback((UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE));
+                               } else if (intent != null && UsbManager.ACTION_USB_DEVICE_DETACHED.equals(intent.getAction())) {
+                                       detachCallback((UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE));
+                               }
+                       }
+               };
+               permFilter = new IntentFilter(UsbSupplicant.ACTION_USB_PERMISSION);
+               hotplugFilter = new IntentFilter(UsbManager.ACTION_USB_DEVICE_ATTACHED);
+               hotplugFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
+       }
+
+       synchronized void start()
+       {
+               context.registerReceiver(permReceiver, permFilter);
+               context.registerReceiver(hotplugReceiver, hotplugFilter);
+       }
+
+       synchronized void stop()
+       {
+               context.unregisterReceiver(hotplugReceiver);
+               context.unregisterReceiver(permReceiver);
+       }
+
+       private void permissionCallback(UsbDevice dev, boolean granted)
+       {
+               Log.d("UsbEventMonitor", "permission " +
+                     (granted ? "granted" : "denied") + " for device " + dev);
+               addRemoveDevice(dev, !granted);
+       }
+
+       private void attachCallback(UsbDevice dev)
+       {
+               Log.d("UsbEventMonitor", "device " + dev + "added");
+               if (manager.hasPermission(dev))
+                       addRemoveDevice(dev, false);
+       }
+
+       private void detachCallback(UsbDevice dev)
+       {
+               Log.d("UsbEventMonitor", "device " + dev + "removed");
+               addRemoveDevice(dev, true);
+       }
+
+       private synchronized void addRemoveDevice(UsbDevice dev, boolean removed)
+       {
+               listener.onUsbDeviceAction(dev.getDeviceName(), removed);
+       }
+}