disable reset button unless there's state to clear

Using a timer seemed easier than adding listeners on a bunch of fields.

xwords4/android/app/src/main/java/org/eehouse/android/xw4/DictBrowseDelegate.java

@@ -25,6 +25,7 @@ import android.app.Dialog;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
+import android.os.Handler;
 import android.text.TextUtils;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -141,6 +142,7 @@ public class DictBrowseDelegate extends DelegateBase
     private Spinner m_spinnerMax;
     private boolean m_newAlertShown;
     private String m_desc;
+    private Runnable mResetChecker;
 
     private class DictListAdapter extends BaseAdapter
         implements SectionIndexer {
@@ -295,6 +297,7 @@ public class DictBrowseDelegate extends DelegateBase
     {
         scrapeBrowseState();
         storeBrowseState();
+        enableResetChecker( false );
         super.onPause();
     }
 
@@ -669,8 +672,9 @@ public class DictBrowseDelegate extends DelegateBase
 
     private void setShowConfig()
     {
-        findViewById(R.id.config).setVisibility( m_browseState.m_expanded
+        boolean expanded = m_browseState.m_expanded;
-                                                 ? View.VISIBLE : View.GONE );
+        findViewById(R.id.config).setVisibility( expanded ? View.VISIBLE : View.GONE );
+        enableResetChecker( expanded );
     }
 
     private void setFindPats( PatDesc[] descs )
@@ -713,7 +717,6 @@ public class DictBrowseDelegate extends DelegateBase
                                          simple_spinner_dropdown_item );
         spinner.setAdapter( adapter );
         spinner.setSelection( curVal - MIN_LEN );
-        // spinner.setOnItemSelectedListener( this );
     }
 
     private void setUpSpinners()
@@ -832,6 +835,35 @@ public class DictBrowseDelegate extends DelegateBase
         }
     }
 
+    final private static int sResetCheckMS = 500;
+    private void enableResetChecker( boolean enable )
+    {
+        DbgUtils.assertOnUIThread();
+        if ( !enable ) {
+            mResetChecker = null;
+        } else if ( null == mResetChecker ) {
+            final Handler handler = new Handler();
+            final Button resetButton = (Button)findViewById(R.id.button_reset);
+            mResetChecker = new Runnable() {
+                    @Override
+                    public void run() {
+                        if ( null != mResetChecker ) {
+                            int curMin = MIN_LEN + m_spinnerMin.getSelectedItemPosition();
+                            int curMax = MIN_LEN + m_spinnerMax.getSelectedItemPosition();
+                            boolean hasState = curMin != MIN_LEN || curMax != MAX_LEN;
+                            for ( int ii = 0; !hasState && ii < m_rows.length; ++ii ) {
+                                hasState = m_rows[ii].hasState();
+                            }
+                            resetButton.setEnabled( hasState );
+
+                            handler.postDelayed( mResetChecker, sResetCheckMS );
+                        }
+                    }
+                };
+            handler.postDelayed( mResetChecker, sResetCheckMS );
+        }
+    }
+
     private static void launch( Delegator delegator, Bundle bundle )
     {
         delegator.addFragment( DictBrowseFrag.newInstance( delegator ),

xwords4/android/app/src/main/java/org/eehouse/android/xw4/PatTableRow.java

@@ -49,6 +49,11 @@ public class PatTableRow extends TableRow implements OnEditorActionListener {
 
     void setOnEnterPressed( EnterPressed proc ) { mEnterProc = proc; }
 
+    boolean hasState()
+    {
+        return 0 < mEdit.getText().length() || mCheck.isChecked();
+    }
+
     @Override
     protected void onFinishInflate()
     {

xwords4/android/app/src/main/res/layout/dict_browser.xml

@@ -123,6 +123,7 @@
                   android:layout_height="wrap_content"
                   android:layout_width="wrap_content"
                   android:text="@string/button_reset"
+                  android:enabled="false"
                   />
         </LinearLayout>
         <LinearLayout android:layout_height="wrap_content"