fix(map): make filter panel compact and scrollable

This reverts commit c15dd28f3b.

app/src/main/java/com/wytehat/btlogger/BluetoothTrackingService.java

@@ -25,10 +25,6 @@ public class BluetoothTrackingService extends Service implements LocationListene
     public static final String ACTION_DATA_CHANGED = "com.wytehat.btlogger.DATA_CHANGED";
     public static final String ACTION_CONFIG_CHANGED = "com.wytehat.btlogger.CONFIG_CHANGED";
     public static final String ACTION_RANGE_MODE = "com.wytehat.btlogger.RANGE_MODE";
-    public static final String ACTION_ACK_LEFT_BEHIND = "com.wytehat.btlogger.ACK_LEFT_BEHIND";
-    public static final String EXTRA_ADDRESS = "address";
-    /** How often an unacknowledged left-behind item re-alerts. */
-    private static final long ALERT_REPEAT_MS = 60000L;
     private static final int NOTIFICATION_ID = 42;
     private static final String CHANNEL_ID = "bluetooth_tracking";
     private static final String ALERT_CHANNEL_ID = "tracked_item_disconnects";
@@ -41,9 +37,6 @@ public class BluetoothTrackingService extends Service implements LocationListene
     private int phoneBattery = 100;
     private final Handler handler = new Handler();
     private final HashMap<String, Long> lastPeriodicLog = new HashMap<String, Long>();
-    /** Items reported left behind, address -> display name, until acknowledged. */
-    private final HashMap<String, String> leftBehind = new HashMap<String, String>();
-    private boolean alertLoopRunning;
 
     private final BroadcastReceiver receiver = new BroadcastReceiver() {
         public void onReceive(Context context, Intent intent) {
@@ -52,10 +45,6 @@ public class BluetoothTrackingService extends Service implements LocationListene
                 rangeModeActive = intent.getBooleanExtra("active", false);
                 return;
             }
-            if (ACTION_ACK_LEFT_BEHIND.equals(action)) {
-                acknowledgeLeftBehind(intent.getStringExtra(EXTRA_ADDRESS));
-                return;
-            }
             if (ACTION_CONFIG_CHANGED.equals(action)) {
                 restartBackgroundScan();
                 configureLocation();
@@ -95,7 +84,7 @@ public class BluetoothTrackingService extends Service implements LocationListene
                 DeviceRecord previous = db.get(address);
                 db.disconnected(address, broadcastName, now, fix, infer(previous));
                 if (previous != null && previous.tracked == 1 && previous.connected == 1)
-                    markLeftBehind(previous, infer(previous));
+                    showDisconnectAlert(previous, infer(previous));
                 captureFresh(address, now);
                 configureLocation();
             } else if (BluetoothDevice.ACTION_FOUND.equals(action)) {
@@ -186,7 +175,6 @@ public class BluetoothTrackingService extends Service implements LocationListene
         filter.addAction(Intent.ACTION_BATTERY_CHANGED);
         filter.addAction(ACTION_CONFIG_CHANGED);
         filter.addAction(ACTION_RANGE_MODE);
-        filter.addAction(ACTION_ACK_LEFT_BEHIND);
         registerReceiver(receiver, filter);
         receiverRegistered = true;
         locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
@@ -204,7 +192,6 @@ public class BluetoothTrackingService extends Service implements LocationListene
 
     public void onDestroy() {
         handler.removeCallbacks(scanTask);
-        handler.removeCallbacks(alertTask);
         try { if (bluetooth != null) bluetooth.stopLeScan(leScanCallback); }
         catch (Exception ignored) { }
         if (receiverRegistered) unregisterReceiver(receiver);
@@ -431,99 +418,16 @@ public class BluetoothTrackingService extends Service implements LocationListene
         return first.getTime() >= second.getTime() ? first : second;
     }
 
-    /**
-     * FLAG_IMMUTABLE (API 23+) is referenced by value because this module
-     * still compiles against SDK 21.
-     */
-    private int pendingFlags() {
-        int flags = PendingIntent.FLAG_UPDATE_CURRENT;
-        if (Build.VERSION.SDK_INT >= 23) flags |= 0x04000000;
-        return flags;
-    }
-
-    private int alertId(String address) {
-        return 1000 + Math.abs(address.hashCode() % 100000);
-    }
-
-    private PendingIntent acknowledgeIntent(String address) {
-        Intent ack = new Intent(ACTION_ACK_LEFT_BEHIND).setPackage(getPackageName());
-        if (address != null) ack.putExtra(EXTRA_ADDRESS, address);
-        return PendingIntent.getBroadcast(this,
-            address == null ? 0 : alertId(address), ack, pendingFlags());
-    }
-
-    /**
-     * Records the item as left behind and keeps alerting until the user
-     * taps "Acknowledge Left Behind" - a swipe alone does not clear it.
-     */
-    private void markLeftBehind(DeviceRecord record, String reason) {
-        if (record == null || record.address == null) return;
-        leftBehind.put(record.address, record.displayName());
-        showDisconnectAlert(record, reason);
-        updateForegroundNotification();
-        startAlertLoop();
-    }
-
-    private void acknowledgeLeftBehind(String address) {
-        NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
-        if (address == null) {
-            for (String pending : leftBehind.keySet().toArray(new String[0])) {
-                try { manager.cancel(alertId(pending)); } catch (Exception ignored) { }
-            }
-            leftBehind.clear();
-        } else {
-            leftBehind.remove(address);
-            try { manager.cancel(alertId(address)); } catch (Exception ignored) { }
-        }
-        if (leftBehind.isEmpty()) {
-            handler.removeCallbacks(alertTask);
-            alertLoopRunning = false;
-        }
-        updateForegroundNotification();
-    }
-
-    private void startAlertLoop() {
-        if (alertLoopRunning) return;
-        alertLoopRunning = true;
-        handler.postDelayed(alertTask, ALERT_REPEAT_MS);
-    }
-
-    /** Re-fires every outstanding alert until each one is acknowledged. */
-    private final Runnable alertTask = new Runnable() {
-        public void run() {
-            if (leftBehind.isEmpty()) { alertLoopRunning = false; return; }
-            for (String address : leftBehind.keySet().toArray(new String[0])) {
-                DeviceRecord record = db.get(address);
-                if (record == null) continue;
-                showDisconnectAlert(record, "Still left behind - not acknowledged");
-            }
-            updateForegroundNotification();
-            handler.postDelayed(this, ALERT_REPEAT_MS);
-        }
-    };
-
-    private void updateForegroundNotification() {
-        try {
-            NotificationManager manager =
-                (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
-            manager.notify(NOTIFICATION_ID, buildNotification());
-        } catch (Exception ignored) { }
-    }
-
     private void showDisconnectAlert(DeviceRecord record, String reason) {
         Intent open = new Intent(this, MainActivity.class);
         PendingIntent pending = PendingIntent.getActivity(this, record.address.hashCode(), open,
-														  pendingFlags());
+														  PendingIntent.FLAG_UPDATE_CURRENT);
         Notification.Builder builder = new Notification.Builder(this)
             .setSmallIcon(R.drawable.ic_launcher)
-            .setContentTitle(record.displayName() + " left behind")
+            .setContentTitle(record.displayName() + " disconnected")
             .setContentText(reason == null ? "Your tracked item is no longer connected" : reason)
-            .setContentIntent(pending).setAutoCancel(false).setOngoing(true)
+            .setContentIntent(pending).setAutoCancel(true)
             .setDefaults(Notification.DEFAULT_ALL).setPriority(Notification.PRIORITY_HIGH);
-        if (Build.VERSION.SDK_INT >= 16) {
-            builder.addAction(R.drawable.ic_launcher, "Acknowledge Left Behind",
-                              acknowledgeIntent(record.address));
-        }
         NotificationManager manager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
         if (Build.VERSION.SDK_INT >= 26) {
             try {
@@ -541,24 +445,12 @@ public class BluetoothTrackingService extends Service implements LocationListene
 
     private Notification buildNotification() {
         Intent open = new Intent(this, MainActivity.class);
-        PendingIntent pending = PendingIntent.getActivity(this, 0, open, pendingFlags());
-        int outstanding = leftBehind.size();
-        String title = outstanding > 0
-            ? outstanding + (outstanding == 1 ? " item left behind" : " items left behind")
-            : "Bluetooth Item Finder";
-        String text = outstanding > 0
-            ? "Alerting until acknowledged: " + describeLeftBehind()
-            : "Watching your tracked items";
+        PendingIntent pending = PendingIntent.getActivity(this, 0, open,
+														  PendingIntent.FLAG_UPDATE_CURRENT);
         Notification.Builder builder = new Notification.Builder(this)
-            .setSmallIcon(R.drawable.ic_launcher).setContentTitle(title)
-            .setContentText(text).setOngoing(true)
+            .setSmallIcon(R.drawable.ic_launcher).setContentTitle("Bluetooth Item Finder")
+            .setContentText("Watching your tracked items").setOngoing(true)
             .setContentIntent(pending);
-        if (Build.VERSION.SDK_INT >= 16 && outstanding > 0) {
-            builder.addAction(R.drawable.ic_launcher,
-                              outstanding == 1 ? "Acknowledge Left Behind" : "Acknowledge All",
-                              acknowledgeIntent(outstanding == 1
-                                                ? leftBehind.keySet().iterator().next() : null));
-        }
         if (Build.VERSION.SDK_INT >= 26) {
             try {
                 Class<?> channelClass = Class.forName("android.app.NotificationChannel");
@@ -575,14 +467,5 @@ public class BluetoothTrackingService extends Service implements LocationListene
         }
         return builder.build();
     }
-
-    private String describeLeftBehind() {
-        StringBuilder names = new StringBuilder();
-        for (String name : leftBehind.values()) {
-            if (names.length() > 0) names.append(", ");
-            names.append(name);
-        }
-        return names.toString();
-    }
 }
 

app/src/main/java/com/wytehat/btlogger/DeviceSort.java

@@ -1,121 +0,0 @@
-package com.wytehat.btlogger;
-
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.List;
-
-/**
- * Ordering for the tracked item list.
- *
- * Default order is newest sighting first. Items that have not been seen for
- * a long time - or that carry no sighting timestamp at all - are pushed to
- * the bottom and stay there in both sort directions, so the reverse toggle
- * never buries a live item under a pile of stale ones.
- */
-final class DeviceSort {
-
-    /** A device unseen for longer than this sinks to the bottom. */
-    static final long STALE_AFTER_MS = 24L * 60L * 60L * 1000L;
-
-    private DeviceSort() {
-    }
-
-    /**
-     * Last moment the device was actually observed. Deliberately ignores
-     * updatedAt, which also moves when the user edits a name or colour.
-     */
-    static long lastSeen(DeviceRecord record) {
-
-        if (record == null) {
-            return 0L;
-        }
-
-        long seen = record.lastRssiAt;
-
-        if (record.connectedAt > seen) {
-            seen = record.connectedAt;
-        }
-
-        if (record.disconnectedAt > seen) {
-            seen = record.disconnectedAt;
-        }
-
-        return seen;
-    }
-
-    static boolean isStale(DeviceRecord record, long now) {
-
-        long seen = lastSeen(record);
-
-        return seen <= 0L ||
-            now - seen > STALE_AFTER_MS;
-    }
-
-    /**
-     * @param reverse false = newest first (default), true = oldest first.
-     */
-    static List<DeviceRecord> sorted(List<DeviceRecord> rows, boolean reverse) {
-
-        ArrayList<DeviceRecord> fresh = new ArrayList<DeviceRecord>();
-        ArrayList<DeviceRecord> stale = new ArrayList<DeviceRecord>();
-
-        if (rows == null) {
-            return fresh;
-        }
-
-        long now = System.currentTimeMillis();
-
-        for (int i = 0; i < rows.size(); i++) {
-
-            DeviceRecord record = rows.get(i);
-
-            if (record == null) {
-                continue;
-            }
-
-            if (isStale(record, now)) {
-                stale.add(record);
-            } else {
-                fresh.add(record);
-            }
-        }
-
-        Comparator<DeviceRecord> newestFirst =
-            new Comparator<DeviceRecord>() {
-
-                public int compare(DeviceRecord left, DeviceRecord right) {
-
-                    long a = lastSeen(left);
-                    long b = lastSeen(right);
-
-                    if (a == b) {
-                        return left.displayName()
-                            .compareToIgnoreCase(right.displayName());
-                    }
-
-                    return a > b ? -1 : 1;
-                }
-            };
-
-        Collections.sort(fresh, newestFirst);
-        Collections.sort(stale, newestFirst);
-
-        if (reverse) {
-            Collections.reverse(fresh);
-            Collections.reverse(stale);
-        }
-
-        ArrayList<DeviceRecord> result =
-            new ArrayList<DeviceRecord>(fresh.size() + stale.size());
-
-        result.addAll(fresh);
-
-        /*
-         * Stale entries are appended last in both directions.
-         */
-        result.addAll(stale);
-
-        return result;
-    }
-}

app/src/main/java/com/wytehat/btlogger/MainActivity.java

@@ -17,7 +17,6 @@ public class MainActivity extends Activity implements ItemActionListener {
     private static final int CAMERA = 200;
     private TrackerDatabase db;
     private DeviceListAdapter adapter;
-    private boolean reverseSort;
     private boolean registered;
     private DeviceRecord editing;
     private final Handler refreshHandler = new Handler();
@@ -47,18 +46,6 @@ public class MainActivity extends Activity implements ItemActionListener {
 				public void onClick(View v) { startActivity(new Intent(MainActivity.this,
 																	   MapActivity.class)); }
 			});
-        reverseSort = getSharedPreferences("list_settings", 0)
-            .getBoolean("reverse_sort", false);
-        updateSortButton();
-        findViewById(R.id.sort_button).setOnClickListener(new View.OnClickListener() {
-				public void onClick(View v) {
-					reverseSort = !reverseSort;
-					getSharedPreferences("list_settings", 0).edit()
-						.putBoolean("reverse_sort", reverseSort).apply();
-					updateSortButton();
-					reload();
-				}
-			});
         findViewById(R.id.settings_button).setOnClickListener(new View.OnClickListener() {
 				public void onClick(View v) { showSettings(); }
 			});
@@ -360,21 +347,7 @@ public class MainActivity extends Activity implements ItemActionListener {
             PackageManager.PERMISSION_GRANTED) list.add(permission);
     }
 
-    private void reload() {
-        if (adapter == null) return;
-        adapter.setRows(DeviceSort.sorted(db.tracked(), reverseSort));
-    }
-
-    /*
-     * Stale items stay pinned to the bottom in both directions, so the
-     * label only describes how the recently seen items are ordered.
-     */
-    private void updateSortButton() {
-        android.widget.Button button =
-            (android.widget.Button) findViewById(R.id.sort_button);
-        if (button == null) return;
-        button.setText(reverseSort ? "Oldest first" : "Newest first");
-    }
+    private void reload() { if (adapter != null) adapter.setRows(db.tracked()); }
 
     private void startTracker() {
         Intent intent = new Intent(this, BluetoothTrackingService.class);

app/src/main/java/com/wytehat/btlogger/MapActivity.java

@@ -1,5 +1,3 @@
-package com.wytehat.btlogger;
-
 import android.app.Activity;
 import android.app.DatePickerDialog;
 import android.app.TimePickerDialog;
@@ -16,8 +14,6 @@ import android.location.LocationListener;
 import android.location.LocationManager;
 import android.net.Uri;
 import android.os.Bundle;
-import android.os.Handler;
-import android.os.Looper;
 import android.view.View;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
@@ -37,8 +33,6 @@ import java.util.Date;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Locale;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
 
 public class MapActivity extends Activity
 implements SensorEventListener {
@@ -55,11 +49,10 @@ implements SensorEventListener {
 
 	private LinearLayout filterPanel;  
 
-
 	private ScrollView filterScroll;
-	private Spinner categorySpinner;
-	private Spinner deviceSpinner;
-	private Spinner resolutionSpinner;
+
+	private Spinner categorySpinner;  
+	private Spinner deviceSpinner;  
 
 	private CheckBox showAll;  
 
@@ -78,54 +71,15 @@ implements SensorEventListener {
 	private final ArrayList<String> deviceLabels =  
 	new ArrayList<String>();  
 
-	private final ArrayList<String> resolutionLabels =
-	new ArrayList<String>();
+	private String categoryFilter = "Trackers / Tags";  
+	private String deviceFilter = "All";  
 
-	/*
-	 * Time-bucket widths for the trail sampler.
-	 * 0 = every stored point (still capped by TrackPointSampler).
-	 */
-	private static final long[] RESOLUTION_VALUES = {
-		0L,
-		15L * 60L * 1000L,
-		60L * 60L * 1000L,
-		120L * 60L * 1000L
-	};
+	private boolean rebuildingCategories;  
+	private boolean rebuildingDevices;  
+	private boolean loadingMap;  
 
-	private static final String[] RESOLUTION_LABELS = {
-		"All points",
-		"Every 15 min",
-		"Every 1 hour",
-		"Every 2 hours"
-	};
-
-	private volatile String categoryFilter = "Trackers / Tags";
-	private volatile String deviceFilter = "All";
-
-	private boolean rebuildingCategories;
-	private boolean rebuildingDevices;
-	private boolean rebuildingResolution = true;
-	private volatile boolean loadingMap;
-
-	private volatile long historyFrom;
-	private volatile long historyTo;
-
-	/*
-	 * Selected trail resolution, read by the background loader.
-	 */
-	private volatile long sampleInterval = RESOLUTION_VALUES[0];
-
-	/*
-	 * Map data (SQLite reads + HTML generation) is built off the main
-	 * thread; only the WebView load and the spinner refresh run on it.
-	 */
-	private final ExecutorService mapExecutor =
-	Executors.newSingleThreadExecutor();
-
-	private final Handler ui =
-	new Handler(Looper.getMainLooper());
-
-	private volatile boolean destroyed;
+	private long historyFrom;  
+	private long historyTo;  
 
 	private LocationManager locationManager;  
 	private SensorManager sensorManager;  
@@ -256,6 +210,7 @@ implements SensorEventListener {
 			dp(4)  
 		);  
 
+
 		/*  
 		 * Category.  
 		 */  
@@ -314,74 +269,14 @@ implements SensorEventListener {
 
 		deviceSpinner.setAdapter(deviceAdapter);  
 
-		filterPanel.addView(
-			deviceSpinner,
-			compactParams()
-		);
+		filterPanel.addView(  
+			deviceSpinner,  
+			compactParams()  
+		);  
 
-		/*
-		 * Trail resolution (downsampling).
-		 */
-		LinearLayout resolutionRow =
-			new LinearLayout(this);
-
-		resolutionRow.setOrientation(
-			LinearLayout.HORIZONTAL
-		);
-
-		resolutionRow.setGravity(
-			android.view.Gravity.CENTER_VERTICAL
-		);
-
-		TextView resolutionLabel =
-			smallLabel("Trail detail");
-
-		resolutionRow.addView(
-			resolutionLabel,
-			new LinearLayout.LayoutParams(
-				LinearLayout.LayoutParams.WRAP_CONTENT,
-				LinearLayout.LayoutParams.WRAP_CONTENT
-			)
-		);
-		resolutionSpinner = new Spinner(this);
-
-		for (int i = 0;
-			 i < RESOLUTION_LABELS.length;
-		i++) {
-
-			resolutionLabels.add(
-				RESOLUTION_LABELS[i]
-			);
-		}
-
-		ArrayAdapter<String> resolutionAdapter =
-			new ArrayAdapter<String>(
-			this,
-			android.R.layout.simple_spinner_item,
-			resolutionLabels
-		);
-
-		resolutionAdapter.setDropDownViewResource(
-			android.R.layout.simple_spinner_dropdown_item
-		);
-
-		resolutionSpinner.setAdapter(
-			resolutionAdapter
-		);
-
-		resolutionRow.addView(
-			resolutionSpinner,
-			new LinearLayout.LayoutParams(
-				0,
-				dp(38),
-				1
-			)
-		);
-
-		filterPanel.addView(resolutionRow);
-		/*
-		 * Time.
-		 */
+		/*  
+		 * Time.  
+		 */  
 		TextView timeLabel =  
 			smallLabel("Location history");  
 
@@ -495,8 +390,8 @@ implements SensorEventListener {
 		filterPanel.addView(showAll);  
 
 		/*
-		 * The panel is scrollable and bounded to a third of the
-		 * screen so every control stays reachable on short screens.
+		 * Bounded to a third of the screen and scrollable, so every
+		 * control stays reachable on short screens.
 		 */
 		filterScroll = new ScrollView(this);
 
@@ -518,6 +413,7 @@ implements SensorEventListener {
 				1
 			)
 		);
+
 		/*  
 		 * WebView map.  
 		 */  
@@ -681,51 +577,7 @@ implements SensorEventListener {
 			}  
 		);  
 
-		/*
-		 * Trail resolution: applied immediately so the user can compare
-		 * densities without reopening the panel.
-		 */
-		resolutionSpinner.setOnItemSelectedListener(
-			new AdapterView.OnItemSelectedListener() {
-
-				@Override
-				public void onItemSelected(
-					AdapterView<?> parent,
-					View view,
-					int position,
-					long id) {
-
-					if (rebuildingResolution) {
-						return;
-					}
-
-					if (position < 0 ||
-						position >=
-						RESOLUTION_VALUES.length) {
-
-						return;
-					}
-
-					if (sampleInterval ==
-						RESOLUTION_VALUES[position]) {
-
-						return;
-					}
-
-					sampleInterval =
-						RESOLUTION_VALUES[position];
-
-					reloadMap();
-				}
-
-				@Override
-				public void onNothingSelected(
-					AdapterView<?> parent) {
-				}
-			}
-		);
-
-		fromButton.setOnClickListener(
+		fromButton.setOnClickListener(  
 			new View.OnClickListener() {  
 
 				@Override  
@@ -837,11 +689,9 @@ implements SensorEventListener {
 			}  
 		);  
 
-		updateTimeButtons();
+		updateTimeButtons();  
 
-		rebuildingResolution = false;
-
-		rebuildDeviceFilter();
+		rebuildDeviceFilter();  
 
 		/*  
 		 * The initial map is deliberately:  
@@ -858,10 +708,10 @@ implements SensorEventListener {
 
 	private LinearLayout.LayoutParams compactParams() {  
 
-		return new LinearLayout.LayoutParams(  
-			LinearLayout.LayoutParams.MATCH_PARENT,  
-			dp(42)  
-		);  
+		return new LinearLayout.LayoutParams(
+			LinearLayout.LayoutParams.MATCH_PARENT,
+			dp(38)
+			);  
 	}  
 
 	private TextView smallLabel(String text) {  
@@ -1051,28 +901,12 @@ implements SensorEventListener {
 		);  
 	}  
 
-	private void rebuildDeviceFilter() {
+	private void rebuildDeviceFilter() {  
 
-		rebuildDeviceFilter(
-			getMapDevices(
-				showAll.isChecked()
-			)
-		);
-	}
+		List<DeviceRecord> available =  
+			getMapDevices();  
 
-	/*
-	 * Main thread only. Accepts an already loaded device list so the
-	 * background loader does not repeat the query.
-	 */
-	private void rebuildDeviceFilter(
-		List<DeviceRecord> available) {
-
-		if (available == null) {
-			available =
-				new ArrayList<DeviceRecord>();
-		}
-
-		ArrayList<String> nextAddresses =
+		ArrayList<String> nextAddresses =  
 			new ArrayList<String>();  
 
 		ArrayList<String> nextLabels =  
@@ -1169,19 +1003,10 @@ implements SensorEventListener {
 		rebuildingDevices = false;  
 	}  
 
-	/*
-	 * Safe to call from a worker thread: the caller passes the checkbox
-	 * state in instead of reading the view here.
-	 */
-	private List<DeviceRecord> getMapDevices(
-		boolean includeAll) {
+	private List<DeviceRecord> getMapDevices() {  
 
-		TrackerDatabase database = db;
-
-		List<DeviceRecord> all =
-			database == null
-				? null
-				: database.all();
+		List<DeviceRecord> all =  
+			db.all();  
 
 		ArrayList<DeviceRecord> result =  
 			new ArrayList<DeviceRecord>();  
@@ -1205,17 +1030,17 @@ implements SensorEventListener {
 			 * Normal map:  
 			 * only explicitly map-enabled devices.  
 			 */  
-			if (!includeAll &&
-				record.mapEnabled != 1) {
+			if (!showAll.isChecked() &&  
+				record.mapEnabled != 1) {  
 
 				continue;  
 			}  
 
 			/*  
-			 * Normal map excludes unknown entries.
-			 */
-			if (!includeAll &&
-				isUnknown(record)) {
+			 * Normal map excludes unknown entries.  
+			 */  
+			if (!showAll.isChecked() &&  
+				isUnknown(record)) {  
 
 				continue;  
 			}  
@@ -1396,175 +1221,82 @@ implements SensorEventListener {
 		return 0;  
 	}  
 
-	private void reloadMap() {
+	private void reloadMap() {  
 
-		if (loadingMap) {
-			return;
-		}
+		if (loadingMap) {  
+			return;  
+		}  
 
-		loadingMap = true;
-		mapReady = false;
+		loadingMap = true;  
+		mapReady = false;  
 
-		/*
-		 * View state is snapshotted on the main thread; everything after
-		 * this point (SQLite reads, trail sampling, HTML generation) runs
-		 * on the worker.
-		 */
-		final boolean includeAll =
-			showAll.isChecked();
+		try {  
 
-		mapExecutor.execute(
-			new Runnable() {
+			List<DeviceRecord> available =  
+				getMapDevices();  
 
-				@Override
-				public void run() {
+			refreshMapCategories(  
+				available  
+			);  
 
-					List<DeviceRecord> available = null;
-					String html = null;
+			/*  
+			 * Rebuild device list after category  
+			 * changes.  
+			 */  
+			rebuildDeviceFilter();  
 
-					try {
+			ArrayList<DeviceRecord> rows =  
+				new ArrayList<DeviceRecord>();  
 
-						available =
-							getMapDevices(includeAll);
+			for (int i = 0;  
+				 i < available.size();  
+			i++) {  
 
-						String device = deviceFilter;
+				DeviceRecord record =  
+					available.get(i);  
 
-						/*
-						 * The selected device may have gone away since
-						 * the last load; fall back to showing all.
-						 */
-						if (!"All".equals(device) &&
-							!containsAddress(
-								available,
-								device
-							)) {
+				if (record == null ||  
+					!record.hasLocation) {  
+					continue;  
+				}  
 
-							device = "All";
-						}
+				if (!categoryMatches(record)) {  
+					continue;  
+				}  
 
-						ArrayList<DeviceRecord> rows =
-							new ArrayList<DeviceRecord>();
+				if (!"All".equals(deviceFilter) &&  
+					!deviceFilter.equals(  
+						record.address  
+					)) {  
+					continue;  
+				}  
 
-						for (int i = 0;
-							 i < available.size();
-						i++) {
+				rows.add(record);  
+			}  
 
-							DeviceRecord record =
-								available.get(i);
+			String html =  
+				buildHtml(  
+				rows,  
+				focus  
+			);  
 
-							if (record == null ||
-								!record.hasLocation) {
-								continue;
-							}
+			web.loadDataWithBaseURL(  
+				"https://unpkg.com/",  
+				html,  
+				"text/html",  
+				"UTF-8",  
+				null  
+			);  
 
-							if (!categoryMatches(record)) {
-								continue;
-							}
+		} finally {  
 
-							if (!"All".equals(device) &&
-								!device.equals(
-									record.address
-								)) {
-								continue;
-							}
+			loadingMap = false;  
+		}  
+	}  
 
-							rows.add(record);
-						}
-
-						html =
-							buildHtml(
-							rows,
-							focus,
-							device
-						);
-
-					} catch (Exception ignored) {
-					}
-
-					final List<DeviceRecord> loaded =
-						available;
-
-					final String content = html;
-
-					ui.post(
-						new Runnable() {
-
-							@Override
-							public void run() {
-
-								try {
-
-									if (destroyed ||
-										web == null) {
-										return;
-									}
-
-									refreshMapCategories(
-										loaded
-									);
-
-									/*
-									 * Rebuild device list after
-									 * category changes.
-									 */
-									rebuildDeviceFilter(
-										loaded
-									);
-
-									if (content != null) {
-
-										web.loadDataWithBaseURL(
-											"https://unpkg.com/",
-											content,
-											"text/html",
-											"UTF-8",
-											null
-										);
-									}
-
-								} finally {
-
-									loadingMap = false;
-								}
-							}
-						}
-					);
-				}
-			}
-		);
-	}
-
-	private boolean containsAddress(
-		List<DeviceRecord> records,
-		String address) {
-
-		if (records == null ||
-			address == null) {
-
-			return false;
-		}
-
-		for (int i = 0;
-			 i < records.size();
-		i++) {
-
-			DeviceRecord record =
-				records.get(i);
-
-			if (record != null &&
-				address.equals(record.address)) {
-
-				return true;
-			}
-		}
-
-		return false;
-	}
-
-	private String buildHtml(
-		List<DeviceRecord> rows,
-		String selectedAddress,
-		String device) {
+	private String buildHtml(  
+		List<DeviceRecord> rows,  
+		String selectedAddress) {  
 
 		StringBuilder script =  
 			new StringBuilder();  
@@ -1573,44 +1305,29 @@ implements SensorEventListener {
 		 * Historical data is loaded ONLY for a  
 		 * specifically selected device.  
 		 */  
-		if (!"All".equals(device)) {
+		if (!"All".equals(deviceFilter)) {  
 
-			for (int i = 0;
-				 i < rows.size();
-			i++) {
+			for (int i = 0;  
+				 i < rows.size();  
+			i++) {  
 
-				DeviceRecord record =
-					rows.get(i);
+				DeviceRecord record =  
+					rows.get(i);  
 
-				if (!device.equals(
-						record.address
-					)) {
-					continue;
-				}
+				if (!deviceFilter.equals(  
+						record.address  
+					)) {  
+					continue;  
+				}  
 
-				TrackerDatabase database = db;
+				List<LocationPoint> history =  
+					db.history(  
+					record.address,  
+					historyFrom,  
+					historyTo  
+				);  
 
-				List<LocationPoint> history =
-					database == null
-						? null
-						: database.history(
-						record.address,
-						historyFrom,
-						historyTo
-					);
-
-				/*
-				 * Dense histories are downsampled here, on the
-				 * worker thread, so the WebView never receives
-				 * thousands of markers.
-				 */
-				history =
-					TrackPointSampler.sample(
-					history,
-					sampleInterval
-				);
-
-				appendHistory(
+				appendHistory(  
 					script,  
 					record,  
 					history,  
@@ -2625,18 +2342,11 @@ implements SensorEventListener {
 	}  
 
 	@Override  
-	protected void onDestroy() {
+	protected void onDestroy() {  
 
-		destroyed = true;
+		try {  
 
-		try {
-			mapExecutor.shutdownNow();
-		} catch (Exception ignored) {
-		}
-
-		try {
-
-			if (web != null) {
+			if (web != null) {  
 				web.stopLoading();  
 				web.destroy();  
 				web = null;  

app/src/main/java/com/wytehat/btlogger/TrackPointSampler.java

@@ -1,132 +0,0 @@
-package com.wytehat.btlogger;
-
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * Downsamples dense GPS history before it is turned into map markers.
- *
- * Time-bucket sampling: the timeline is cut into fixed buckets and one
- * representative point (the most accurate fix) survives per bucket. The very
- * first and last fixes are always kept so the trail keeps its real endpoints.
- *
- * A hard ceiling is applied afterwards - even "All Points" cannot hand the
- * WebView an unbounded number of circle markers.
- */
-final class TrackPointSampler {
-
-    /** Ceiling on rendered points, applied regardless of the chosen interval. */
-    static final int MAX_RENDERED_POINTS = 750;
-
-    private TrackPointSampler() {
-    }
-
-    /**
-     * @param bucketMillis bucket width, or 0 for "All Points" (cap only).
-     */
-    static List<LocationPoint> sample(List<LocationPoint> points, long bucketMillis) {
-
-        if (points == null || points.size() < 3) {
-            return points;
-        }
-
-        List<LocationPoint> reduced =
-            bucketMillis > 0
-                ? bucket(points, bucketMillis)
-                : points;
-
-        return cap(reduced);
-    }
-
-    private static List<LocationPoint> bucket(List<LocationPoint> points, long bucketMillis) {
-
-        ArrayList<LocationPoint> result = new ArrayList<LocationPoint>();
-
-        LocationPoint best = null;
-        long currentBucket = 0;
-
-        for (int i = 0; i < points.size(); i++) {
-
-            LocationPoint point = points.get(i);
-
-            if (point == null) {
-                continue;
-            }
-
-            long bucketIndex = point.timestamp / bucketMillis;
-
-            if (best == null) {
-                best = point;
-                currentBucket = bucketIndex;
-                continue;
-            }
-
-            if (bucketIndex != currentBucket) {
-                result.add(best);
-                best = point;
-                currentBucket = bucketIndex;
-                continue;
-            }
-
-            if (moreAccurate(point, best)) {
-                best = point;
-            }
-        }
-
-        if (best != null) {
-            result.add(best);
-        }
-
-        /*
-         * Always terminate on the newest fix - that is the one the user cares
-         * about when reading a trail.
-         */
-        LocationPoint last = points.get(points.size() - 1);
-
-        if (last != null &&
-            (result.isEmpty() ||
-             result.get(result.size() - 1) != last)) {
-
-            result.add(last);
-        }
-
-        return result;
-    }
-
-    private static List<LocationPoint> cap(List<LocationPoint> points) {
-
-        int size = points.size();
-
-        if (size <= MAX_RENDERED_POINTS) {
-            return points;
-        }
-
-        int stride = (size + MAX_RENDERED_POINTS - 1) / MAX_RENDERED_POINTS;
-
-        ArrayList<LocationPoint> result = new ArrayList<LocationPoint>();
-
-        for (int i = 0; i < size; i += stride) {
-            result.add(points.get(i));
-        }
-
-        LocationPoint last = points.get(size - 1);
-
-        if (result.isEmpty() ||
-            result.get(result.size() - 1) != last) {
-
-            result.add(last);
-        }
-
-        return result;
-    }
-
-    private static boolean moreAccurate(LocationPoint candidate, LocationPoint current) {
-
-        if (candidate.accuracy <= 0) {
-            return false;
-        }
-
-        return current.accuracy <= 0 ||
-            candidate.accuracy < current.accuracy;
-    }
-}

app/src/main/java/com/wytehat/btlogger/TrackerDatabase.java

@@ -17,25 +17,10 @@ public class TrackerDatabase extends SQLiteOpenHelper {
         super(context, DB_NAME, null, DB_VERSION);
     }
 
-	public synchronized List<LocationPoint> history(String address, long historyFrom, long historyTo)
+	public List<LocationPoint> history(String address, long historyFrom, long historyTo)
 	{
-		ArrayList<LocationPoint> result = new ArrayList<LocationPoint>();
-		if (address == null) return result;
-		Cursor cursor = getReadableDatabase().query("location_history", null,
-			"address=? AND logged_at>=? AND logged_at<=?",
-			new String[] { address, String.valueOf(historyFrom), String.valueOf(historyTo) },
-			null, null, "logged_at ASC");
-		try {
-			while (cursor.moveToNext()) {
-				LocationPoint point = new LocationPoint();
-				point.latitude = cursor.getDouble(cursor.getColumnIndex("latitude"));
-				point.longitude = cursor.getDouble(cursor.getColumnIndex("longitude"));
-				point.accuracy = cursor.getFloat(cursor.getColumnIndex("accuracy"));
-				point.timestamp = cursor.getLong(cursor.getColumnIndex("logged_at"));
-				result.add(point);
-			}
-		} finally { cursor.close(); }
-		return result;
+		// TODO: Implement this method
+		return null;
 	}
 
     public void onCreate(SQLiteDatabase db) {

app/src/main/res/layout/main.xml

@@ -6,10 +6,7 @@
   <Button android:id="@+id/map_all_button" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" android:text="MAP"/>
   <Button android:id="@+id/settings_button" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" android:text="SETTINGS"/>
  </LinearLayout>
- <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:gravity="center_vertical">
-  <TextView android:id="@+id/tracking_status" android:text="@string/tracking_status" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" android:paddingLeft="12dp" android:paddingBottom="8dp" android:textColor="#2878ff"/>
-  <Button android:id="@+id/sort_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Newest first" android:textSize="10sp" android:layout_marginRight="8dp"/>
- </LinearLayout>
+ <TextView android:id="@+id/tracking_status" android:text="@string/tracking_status" android:layout_width="match_parent" android:layout_height="wrap_content" android:paddingLeft="12dp" android:paddingBottom="8dp" android:textColor="#2878ff"/>
  <ListView android:id="@+id/device_list" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:dividerHeight="10dp" android:padding="8dp"/>
  <TextView android:id="@+id/empty_view" android:text="No tracked items yet. Use ADD / PAIR to choose an item." android:gravity="center" android:layout_width="match_parent" android:layout_height="match_parent"/>
 </LinearLayout>