make +Blank button disabled until focus gained

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

@@ -482,6 +482,20 @@ public class DictBrowseDelegate extends DelegateBase
         return m_stateKey;
     }
 
+    // We'll enable the button as soon as any row gets focus, since once one
+    // of them has focus one always will.
+    private boolean mBlankButtonEnabled = false;
+    private Runnable mFocusGainedProc = new Runnable() {
+            @Override
+            public void run() {
+                if ( !mBlankButtonEnabled ) {
+                    mBlankButtonEnabled = true;
+                    findViewById(R.id.button_addBlank)
+                        .setEnabled( true );
+                }
+            }
+        };
+
     private void findTableRows()
     {
         ViewGroup table = (ViewGroup)findViewById( R.id.config );
@@ -490,7 +504,9 @@ public class DictBrowseDelegate extends DelegateBase
         for ( int ii = 0; ii < count && nFound < m_rows.length; ++ii ) {
             View child = table.getChildAt( ii );
             if ( child instanceof PatTableRow ) {
-                m_rows[nFound++] = (PatTableRow)child;
+                PatTableRow row = (PatTableRow)child;
+                m_rows[nFound++] = row;
+                row.setOnFocusGained( mFocusGainedProc );
             }
         }
         Assert.assertTrueNR( nFound == m_rows.length );
@@ -576,12 +592,6 @@ public class DictBrowseDelegate extends DelegateBase
         for ( PatTableRow row : m_rows ) {
             handled = handled || row.addBlankToFocussed( "_" );
         }
-        if ( !handled ) {
-            makeNotAgainBuilder( R.string.blank_button_expl,
-                                 R.string.key_na_addBlankButton )
-                .setTitle(null)
-                .show();
-        }
     }
 
     private void setShowConfig()

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

@@ -73,6 +73,20 @@ public class PatTableRow extends TableRow {
         return handled;
     }
 
+    void setOnFocusGained( final Runnable proc )
+    {
+        getFields();
+        mEdit.setOnFocusChangeListener( new View.OnFocusChangeListener() {
+                @Override
+                public void onFocusChange( View view, boolean hasFocus )
+                {
+                    if ( hasFocus ) {
+                        proc.run();
+                    }
+                }
+            } );
+    }
+
     private void getFields()
     {
         mEdit = (EditText)Utils.getChildInstanceOf( this, EditText.class );

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

@@ -102,6 +102,7 @@
                 android:layout_width="wrap_content"
                 android:text="@string/button_addBlank"
                 android:layout_span="1"
+                android:enabled="false"
                 />
       </TableRow>
       <LinearLayout android:layout_height="wrap_content"

xwords4/android/app/src/main/res/values/common_rsrc.xml

@@ -155,7 +155,6 @@
   <string name="key_na_sms_banned">key_na_sms_banned</string>
   <string name="key_na_longtap_lookup">key_na_longtap_lookup</string>
   <string name="key_na_perms_phonestate">key_na_perms_phonestate</string>
-  <string name="key_na_addBlankButton">key_na_addBlankButton</string>
   <string name="key_na_newFeatureFilter">key_na_newFeatureFilter</string>
 
   <string name="key_na_dupstatus_host">key_na_dupstatus_host</string>

xwords4/android/app/src/main/res/values/strings.xml

@@ -1555,12 +1555,11 @@
          name, e.g. Tiles for English -->
     <string name="show_tiles_title_fmt">Tiles for %1$s</string>
 
-    <!-- Shown when user uses the +Blank button in wordlist browser
-         but nothing can be done because there's not focussed text
-         field -->
-    <string name="blank_button_expl">This button inserts a blank at
-    the active text field’s cursor, but there is no cursor
-    now.</string>
+    <!-- Menuitem in Wordlist browser, and title of the alert you get
+         when you choose it. The alert shows the note that's part of
+         the wordlist, typically telling where it comes from. If
+         there's no note in a wordlist the menuitem is disabled. -->
+    <string name="show_note_menu">About Wordlist</string>
 
     <!-- Label for first field in wordlist browser filter -->
     <string name="pat_starts_with">Starts with</string>
@@ -2611,6 +2610,4 @@
     <string name="mqtt_invite_title">MQTT Invitation</string>
     <string name="not_again_comms_mqtt">I’m experimenting with this
     as a replacement for the relay.</string>
-
-    <string name="show_note_menu">About Wordlist</string>
 </resources>