From 3ead365d73d7e1674b3afee8e943249fee4a3b48 Mon Sep 17 00:00:00 2001
From: "David A. Madore" <david@procyon.(none)>
Date: Tue, 27 Apr 2010 18:47:48 +0200
Subject: Retain display (and display history) on configuration change.
This works surprisingly well: there must be a grue hiding in the
darkness waiting to eat me. :-)
---
.../android/unicodeMap/UnicodeMapActivity.java | 38 ++++++++++++++++++----
1 file changed, 31 insertions(+), 7 deletions(-)
(limited to 'src')
diff --git a/src/org/madore/android/unicodeMap/UnicodeMapActivity.java b/src/org/madore/android/unicodeMap/UnicodeMapActivity.java
index 9f8194f..687493e 100644
--- a/src/org/madore/android/unicodeMap/UnicodeMapActivity.java
+++ b/src/org/madore/android/unicodeMap/UnicodeMapActivity.java
@@ -136,7 +136,7 @@ public final class UnicodeMapActivity extends ListActivity {
dispHistory.add(new DisplayAndPosition(curDisp, position, yOffset));
}
- protected void doDisplay(Display disp) {
+ protected void doDisplay(Display disp, boolean isNew) {
curDisp = disp;
List<UnicodeDisplayable> list;
UnicodeArrayAdapter adapter;
@@ -168,7 +168,7 @@ public final class UnicodeMapActivity extends ListActivity {
list.remove(list.size()-1);
adapter = new UnicodeArrayAdapter(this, list);
setListAdapter(adapter);
- if ( overflowed ) {
+ if ( overflowed && isNew ) {
String str = getResources().getString(R.string.list_too_long);
Toast.makeText(UnicodeMapActivity.this,
String.format(str, limit),
@@ -195,7 +195,7 @@ public final class UnicodeMapActivity extends ListActivity {
else if ( it instanceof UnicodeCharacter.Range ) {
Display newDisp = new RangeDisplay((UnicodeCharacter.Range)it);
saveDisplay(view, position);
- doDisplay(newDisp);
+ doDisplay(newDisp, true);
} else
throw new AssertionError("unknown UnicodeDisplayable");
}
@@ -262,7 +262,19 @@ public final class UnicodeMapActivity extends ListActivity {
final boolean needPopulate = db.needPopulate();
if ( needPopulate )
launchPopulation();
- doDisplay(new RootDisplay());
+ lv = getListView();
+ Object testament = getLastNonConfigurationInstance();
+ if ( testament != null ) {
+ @SuppressWarnings("unchecked")
+ List<DisplayAndPosition> oldDispHistory = (List<DisplayAndPosition>)testament;
+ dispHistory.clear();
+ dispHistory.addAll(oldDispHistory);
+ assert(dispHistory.size() > 0);
+ DisplayAndPosition saved = dispHistory.remove(dispHistory.size()-1);
+ doDisplay(saved.getDisp(), false);
+ lv.setSelectionFromTop(saved.getSelPosition(), saved.getYOffset());
+ } else
+ doDisplay(new RootDisplay(), true);
final ClipboardManager cmgr
= (ClipboardManager)getSystemService(Context.CLIPBOARD_SERVICE);
final Button btn = (Button) findViewById(R.id.copyButton);
@@ -275,20 +287,32 @@ public final class UnicodeMapActivity extends ListActivity {
Toast.LENGTH_SHORT).show();
}
});
- lv = getListView();
lv.setTextFilterEnabled(true);
MapItemClickListener listener = new MapItemClickListener();
lv.setOnItemClickListener(listener);
lv.setOnItemLongClickListener(listener);
}
+ @Override
+ public void onDestroy() {
+ db.close();
+ db = null;
+ super.onDestroy();
+ }
+
+ @Override
+ public Object onRetainNonConfigurationInstance() {
+ saveDisplay();
+ return dispHistory;
+ }
+
final static int searchLimit = 1000;
protected void doSearch(String s) {
Display newDisp = new SearchDisplay(getResources().getString(R.string.search_results),
s, searchLimit);
saveDisplay();
- doDisplay(newDisp);
+ doDisplay(newDisp, true);
}
protected void querySearch() {
@@ -347,7 +371,7 @@ public final class UnicodeMapActivity extends ListActivity {
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ( ( keyCode == KeyEvent.KEYCODE_BACK ) && dispHistory.size() > 0 ) {
DisplayAndPosition saved = dispHistory.remove(dispHistory.size()-1);
- doDisplay(saved.getDisp());
+ doDisplay(saved.getDisp(), false);
lv.setSelectionFromTop(saved.getSelPosition(), saved.getYOffset());
return true;
} else if ( keyCode == KeyEvent.KEYCODE_SEARCH ) {
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