fix(map): make filter panel compact and scrollable

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

@@ -26,6 +26,7 @@ import android.widget.ArrayAdapter;
 import android.widget.Button;
 import android.widget.CheckBox;
 import android.widget.LinearLayout;
+import android.widget.ScrollView;
 import android.widget.Spinner;
 import android.widget.TextView;
 
@@ -54,6 +55,8 @@ implements SensorEventListener {
 
 	private LinearLayout filterPanel;  
 
+
+	private ScrollView filterScroll;
 	private Spinner categorySpinner;
 	private Spinner deviceSpinner;
 	private Spinner resolutionSpinner;
@@ -253,8 +256,6 @@ implements SensorEventListener {
 			dp(4)  
 		);  
 
-		filterPanel.setVisibility(View.GONE);  
-
 		/*  
 		 * Category.  
 		 */  
@@ -321,11 +322,27 @@ implements SensorEventListener {
 		/*
 		 * Trail resolution (downsampling).
 		 */
+		LinearLayout resolutionRow =
+			new LinearLayout(this);
+
+		resolutionRow.setOrientation(
+			LinearLayout.HORIZONTAL
+		);
+
+		resolutionRow.setGravity(
+			android.view.Gravity.CENTER_VERTICAL
+		);
+
 		TextView resolutionLabel =
 			smallLabel("Trail detail");
 
-		filterPanel.addView(resolutionLabel);
-
+		resolutionRow.addView(
+			resolutionLabel,
+			new LinearLayout.LayoutParams(
+				LinearLayout.LayoutParams.WRAP_CONTENT,
+				LinearLayout.LayoutParams.WRAP_CONTENT
+			)
+		);
 		resolutionSpinner = new Spinner(this);
 
 		for (int i = 0;
@@ -352,11 +369,16 @@ implements SensorEventListener {
 			resolutionAdapter
 		);
 
-		filterPanel.addView(
+		resolutionRow.addView(
 			resolutionSpinner,
-			compactParams()
+			new LinearLayout.LayoutParams(
+				0,
+				dp(38),
+				1
+			)
 		);
 
+		filterPanel.addView(resolutionRow);
 		/*
 		 * Time.
 		 */
@@ -472,14 +494,30 @@ implements SensorEventListener {
 
 		filterPanel.addView(showAll);  
 
-		root.addView(  
+		/*
+		 * The panel is scrollable and bounded to a third of the
+		 * screen so every control stays reachable on short screens.
+		 */
+		filterScroll = new ScrollView(this);
+
+		filterScroll.setVisibility(View.GONE);
+
+		filterScroll.addView(
 			filterPanel,
-			new LinearLayout.LayoutParams(  
-				LinearLayout.LayoutParams.MATCH_PARENT,  
-				LinearLayout.LayoutParams.WRAP_CONTENT  
+			new android.widget.FrameLayout.LayoutParams(
+				android.widget.FrameLayout.LayoutParams.MATCH_PARENT,
+				android.widget.FrameLayout.LayoutParams.WRAP_CONTENT
 			)
 		);
 
+		root.addView(
+			filterScroll,
+			new LinearLayout.LayoutParams(
+				LinearLayout.LayoutParams.MATCH_PARENT,
+				0,
+				1
+			)
+		);
 		/*  
 		 * WebView map.  
 		 */  
@@ -526,7 +564,7 @@ implements SensorEventListener {
 			new LinearLayout.LayoutParams(
 				LinearLayout.LayoutParams.MATCH_PARENT,
 				0,
-				1  
+				2
 			)
 		);  
 
@@ -561,19 +599,12 @@ implements SensorEventListener {
 				@Override  
 				public void onClick(View view) {  
 
-					if (filterPanel.getVisibility()  
-						== View.VISIBLE) {  
-
-						filterPanel.setVisibility(  
-							View.GONE  
+					filterScroll.setVisibility(
+						filterScroll.getVisibility()
+						== View.VISIBLE
+							? View.GONE
+							: View.VISIBLE
 					);  
-
-					} else {  
-
-						filterPanel.setVisibility(  
-							View.VISIBLE  
-						);  
-					}  
 				}  
 			}  
 		);  
@@ -775,7 +806,7 @@ implements SensorEventListener {
 					/*  
 					 * Collapse after applying.  
 					 */  
-					filterPanel.setVisibility(  
+					filterScroll.setVisibility(
 						View.GONE
 					);  
 				}