Try hard to display a unique device name in ControlCenter

(Makes it a little easier to deal with muliple "MI" devices, for example)

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/adapter/GBDeviceAdapter.java

@@ -47,7 +47,7 @@ public class GBDeviceAdapter extends ArrayAdapter<GBDevice> {
         ImageView deviceImageView = (ImageView) view.findViewById(R.id.device_image);
         ProgressBar busyIndicator = (ProgressBar) view.findViewById(R.id.device_busy_indicator);
 
-        deviceNameLabel.setText(device.getName());
+        deviceNameLabel.setText(getUniqueDeviceName(device));
         deviceInfoLabel.setText(device.getInfoString());
 
         if (device.isBusy()) {
@@ -93,4 +93,25 @@ public class GBDeviceAdapter extends ArrayAdapter<GBDevice> {
 
         return view;
     }
+
+    private String getUniqueDeviceName(GBDevice device) {
+        String deviceName = device.getName();
+        if (!isUniqueDeviceName(device, deviceName)) {
+            deviceName = deviceName + " " + device.getShortAddress();
+        }
+        return deviceName;
+    }
+
+    private boolean isUniqueDeviceName(GBDevice device, String deviceName) {
+        for (int i = 0; i < getCount(); i++) {
+            GBDevice item = getItem(i);
+            if (item == device) {
+                continue;
+            }
+            if (deviceName.equals(item.getName())) {
+                return false;
+            }
+        }
+        return true;
+    }
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/impl/GBDevice.java

@@ -4,6 +4,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.os.Parcel;
 import android.os.Parcelable;
+import android.support.annotation.NonNull;
 import android.support.v4.content.LocalBroadcastManager;
 
 import org.slf4j.Logger;
@@ -309,6 +310,22 @@ public class GBDevice implements Parcelable {
         return "Device " + getName() + ", " + getAddress() + ", " + getStateString();
     }
 
+    /**
+     * Returns a shortened form of the device's address, in order to form a
+     * unique name in companion with #getName().
+     */
+    @NonNull
+    public String getShortAddress() {
+        String address = getAddress();
+        if (address != null) {
+            if (address.length() > 5) {
+                return address.substring(address.length() - 5);
+            }
+            return address;
+        }
+        return "";
+    }
+
     public enum State {
         // Note: the order is important!
         NOT_CONNECTED,