Added proximity descriptor

library/src/uk/co/alt236/bluetoothlelib/device/mfdata/IBeaconManufacturerData.java

@@ -66,7 +66,7 @@ public final class IBeaconManufacturerData {
 		mUUID =  calculateUUIDString(Arrays.copyOfRange(mData, 4, 20));
 		mMajor = ByteUtils.getIntFrom2ByteArray(Arrays.copyOfRange(mData, 20, 22));
 		mMinor = ByteUtils.getIntFrom2ByteArray(Arrays.copyOfRange(mData, 22, 24));
-		mCalibratedTxPower = ByteUtils.getIntFromByte(data[24]);
+		mCalibratedTxPower = data[24];
 	}
 
 
@@ -87,7 +87,7 @@ public final class IBeaconManufacturerData {
 		return sb.toString();
 	}
 
-	public double getAccuracy(int rssi){
+	public double getAccuracy(double rssi){
 		return calculateAccuracy(mCalibratedTxPower, rssi);
 	}
 
@@ -99,6 +99,22 @@ public final class IBeaconManufacturerData {
 		return mCompanyIdentidier;
 	}
 
+	public String getDistanceDescriptor(double accuracy){
+		if(accuracy < 0){
+			return "WTF";
+		}
+
+		if(accuracy < 0.5){
+			return "IMMEDIATE";
+		}
+
+		if(accuracy < 3.0){
+			return "NEAR";
+		}
+
+		return "FAR";
+	}
+
 	public int getIBeaconAdvertisement(){
 		return mIBeaconAdvertisment;
 	}
@@ -116,7 +132,7 @@ public final class IBeaconManufacturerData {
 	}
 
 	// Code taken from: http://stackoverflow.com/questions/20416218/understanding-ibeacon-distancing
-	protected static double calculateAccuracy(int txPower, double rssi) {
+	private static double calculateAccuracy(int txPower, double rssi) {
 		if (rssi == 0) {
 			return -1.0; // if we cannot determine accuracy, return -1.
 		}

sample_app/res/layout/list_item_device.xml

@@ -48,7 +48,8 @@
                 android:layout_height="wrap_content"
                 android:paddingRight="5dp"
                 android:text="@string/label_mac"
-                android:textSize="12sp" />
+                android:textSize="12sp"
+                android:textStyle="bold" />
 
             <TextView
                 android:id="@+id/device_address"
@@ -60,9 +61,11 @@
             <TextView
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
+                android:paddingLeft="5dp"
                 android:paddingRight="5dp"
                 android:text="@string/label_rssi"
-                android:textSize="12sp" />
+                android:textSize="12sp"
+                android:textStyle="bold" />
 
             <TextView
                 android:id="@+id/device_rssi"
@@ -83,7 +86,8 @@
                 android:layout_height="wrap_content"
                 android:paddingRight="5dp"
                 android:text="@string/label_uuid"
-                android:textSize="12sp" />
+                android:textSize="12sp"
+                android:textStyle="bold" />
 
             <TextView
                 android:id="@+id/ibeacon_uuid"
@@ -98,7 +102,8 @@
                 android:layout_height="wrap_content"
                 android:paddingRight="5dp"
                 android:text="@string/label_major"
-                android:textSize="12sp" />
+                android:textSize="12sp"
+                android:textStyle="bold" />
 
             <TextView
                 android:id="@+id/ibeacon_major"
@@ -110,9 +115,11 @@
             <TextView
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
+                android:paddingLeft="5dp"
                 android:paddingRight="5dp"
                 android:text="@string/label_minor"
-                android:textSize="12sp" />
+                android:textSize="12sp"
+                android:textStyle="bold" />
 
             <TextView
                 android:id="@+id/ibeacon_minor"
@@ -126,7 +133,8 @@
                 android:layout_height="wrap_content"
                 android:paddingRight="5dp"
                 android:text="@string/label_tx_power"
-                android:textSize="12sp" />
+                android:textSize="12sp"
+                android:textStyle="bold" />
 
             <TextView
                 android:id="@+id/ibeacon_tx_power"
@@ -138,9 +146,11 @@
             <TextView
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
+                android:paddingLeft="5dp"
                 android:paddingRight="5dp"
                 android:text="@string/label_distance"
-                android:textSize="12sp" />
+                android:textSize="12sp"
+                android:textStyle="bold" />
 
             <TextView
                 android:id="@+id/ibeacon_distance"

sample_app/src/uk/co/alt236/btlescan/adapters/LeDeviceListAdapter.java

@@ -1,5 +1,6 @@
 package uk.co.alt236.btlescan.adapters;
 
+import java.text.DecimalFormat;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -16,6 +17,8 @@ import android.widget.ImageView;
 import android.widget.TextView;
 // Adapter for holding devices found through scanning.
 public class LeDeviceListAdapter extends BaseAdapter {
+	private static final DecimalFormat DOUBLE_TWO_DIGIT_ACCURACY = new DecimalFormat("#.##");
+
 	private final List<BluetoothLeDevice> mLeDevices;
 	private final LayoutInflater mInflator;
 
@@ -81,6 +84,7 @@ import android.widget.TextView;
 
 		final BluetoothLeDevice device = mLeDevices.get(i);
 		final String deviceName = device.getName();
+		final double rssi = device.getRssi();
 
 		if (deviceName != null && deviceName.length() > 0){
 			viewHolder.deviceName.setText(deviceName);
@@ -90,20 +94,23 @@ import android.widget.TextView;
 
 		if (IBeaconUtils.isThisAnIBeacon(device)){
 			final IBeaconManufacturerData data = new IBeaconManufacturerData(device);
+			final double accuracy = data.getAccuracy(rssi);
+
 			viewHolder.deviceIcon.setImageResource(R.drawable.ic_device_ibeacon);
 			viewHolder.ibeaconSection.setVisibility(View.VISIBLE);
 			viewHolder.ibeaconMajor.setText(String.valueOf(data.getMajor()));
 			viewHolder.ibeaconMinor.setText(String.valueOf(data.getMinor()));
 			viewHolder.ibeaconTxPower.setText(String.valueOf(data.getCalibratedTxPower()));
 			viewHolder.ibeaconUUID.setText(data.getUUID());
-                viewHolder.ibeaconDistance.setText(String.valueOf(data.getAccuracy(device.getRssi())));
+			viewHolder.ibeaconDistance.setText(
+					DOUBLE_TWO_DIGIT_ACCURACY.format(accuracy) + "m " + data.getDistanceDescriptor(accuracy));
 		} else {
 			viewHolder.deviceIcon.setImageResource(R.drawable.ic_bluetooth);
 			viewHolder.ibeaconSection.setVisibility(View.GONE);
 		}
 
 		viewHolder.deviceAddress.setText(device.getAddress());
-            viewHolder.deviceRssi.setText(String.valueOf(device.getRssi()) + "db");
+		viewHolder.deviceRssi.setText(String.valueOf(rssi) + "db");
 		return view;
 	}