CouchDB on Android
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This document discusses using CouchDB on Android applications. It provides instructions on adding CouchDB functionality to an Android project using Couchbase Mobile for Android. It also describes how to access a CouchDB instance from an Android device using Futon and the Couchbase Service. The document contains code examples for creating, reading, updating and deleting CouchDB documents from an Android app.
![Simple Design Doc
{
"_id":"_design/todo",
"views" : {
"all" : {
"map": "function(doc) { if (doc.type && doc.type === 'todo')
{ emit(doc.timestamp, [doc.text, doc._rev]); }};"
}
}
}](https://image.slidesharecdn.com/couchdbandroid-110915092902-phpapp01/85/CouchDB-on-Android-43-320.jpg)
![Deleting
SparseBooleanArray spar = getListView().getCheckedItemPositions();
for (int i = 0; i < todos.getCount(); i++) {
if (spar.get(i)) {
Todo todo = todos.getItem(i);
getListView().setItemChecked(i, false);
try {
AndCouch.httpRequest("DELETE", baseURL + DB_NAME + "/" + todo.getId() + "?
rev=" + todo.getRev(),
null, new String[][] {});
} catch (JSONException e) {
e.printStackTrace();
}
}
}
refreshTodos();](https://image.slidesharecdn.com/couchdbandroid-110915092902-phpapp01/85/CouchDB-on-Android-44-320.jpg)
CouchDB on Android
- 2. about Sven Haiges, hybris GmbH Twitter @hansamann Android, HTML5, Groovy & Grails [email protected]
- 3. about Sven Haiges, hybris GmbH Twitter @hansamann Android, HTML5, Groovy & Grails [email protected]
- 4. CouchDB
- 5. Erlang on Android! Source: http://couchdb.apache.org/
- 6. sync
- 7. CouchDB • document-based, RESTful HTTP API • replication built-in • both database and web server • no locks, uses multi-version concurrency control • Map & Reduce Functions = Views
- 9. <host>/_utils = Futon Admin
- 10. Mobile Futon
- 13. adb forward tcp:5999 tcp:33595
- 16. build your own
- 17. #1 new android project
- 19. #2 add couchbase.zip http://www.couchbase.org/get/couchbase-mobile-for- android/current
- 21. #3 run as Ant file
- 23. done...
- 24. AndroidManifest.xml <?xml version="1.0" encoding="UTF-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="de.flavor.relax" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="10" /> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".RelaxActivity" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <service android:exported="false" android:enabled="true" android:name="com.couchbase.android.CouchbaseService" /> </application> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> </manifest>
- 25. in your Activity... private final ICouchbaseDelegate mDelegate = new ICouchbaseDelegate() { public void couchbaseStarted(String host, int port) { Toast.makeText(RelaxActivity.this, host + ":" + port, Toast.LENGTH_LONG).show(); } public void installing(int completed, int total) { Log.d("demo", "Installing... " + completed + "/" + total); } public void exit(String error) { Log.d("demo", error); } };
- 26. in your Activity... @Override protected void onResume() { super.onResume(); CouchbaseMobile couch = new CouchbaseMobile(getBaseContext(), mDelegate); couchServiceConnection = couch.startCouchbase(); }
- 27. ektorp
- 28. AndCouch
- 29. AndCouch • https://github.com/daleharvey/Android- MobileFuton • Just a quick HTTP wrapper, but gets the job done! • CouchDemo App...
- 38. Todo.java public class Todo { private String id; private String rev; private String text; private long timestamp; public Todo(String id, String rev, String text, long timestamp) { super(); this.id = id; this.rev = rev; this.text = text; this.timestamp = timestamp; } ... }
- 39. Creating String value = input.getText().toString(); JSONObject obj = new JSONObject(); try { obj.put("type", "todo"); obj.put("text", value); obj.put("timestamp", new Date().getTime()); JSONObject result = AndCouch.put(baseURL + DB_NAME + "/" + UUID.randomUUID().toString(), obj.toString()).json; if (result.getBoolean("ok") == true) refreshTodos(); } catch (JSONException e) { e.printStackTrace(); }
- 40. Reading (all) try { todos.clear(); JSONObject json = AndCouch.get(baseURL + DB_NAME + "/_design/todo/_view/all").json; JSONArray rows = json.getJSONArray("rows"); for (int i = 0; i < rows.length(); i++) { JSONObject todoObj = rows.getJSONObject(i); JSONArray value = todoObj.getJSONArray("value"); todos.add(new Todo(todoObj.getString("id"), value.getString(1), value.getString(0), todoObj.getLong("key"))); } todos.notifyDataSetChanged(); } catch (JSONException e) { e.printStackTrace(); }
- 41. Reading (all) try { todos.clear(); JSONObject json = AndCouch.get(baseURL + DB_NAME + "/_design/todo/_view/all").json; JSONArray rows = json.getJSONArray("rows"); for (int i = 0; i < rows.length(); i++) { JSONObject todoObj = rows.getJSONObject(i); JSONArray value = todoObj.getJSONArray("value"); todos.add(new Todo(todoObj.getString("id"), value.getString(1), value.getString(0), todoObj.getLong("key"))); } todos.notifyDataSetChanged(); } catch (JSONException e) { e.printStackTrace(); }
- 42. Design Documents • normal json documents, but ids begin with _design/, e.g. _design/myapp (no %2F :-) • contain views (Map & Reduce functions) as well as other application functions (validation, show/list)
- 43. Simple Design Doc { "_id":"_design/todo", "views" : { "all" : { "map": "function(doc) { if (doc.type && doc.type === 'todo') { emit(doc.timestamp, [doc.text, doc._rev]); }};" } } }
- 44. Deleting SparseBooleanArray spar = getListView().getCheckedItemPositions(); for (int i = 0; i < todos.getCount(); i++) { if (spar.get(i)) { Todo todo = todos.getItem(i); getListView().setItemChecked(i, false); try { AndCouch.httpRequest("DELETE", baseURL + DB_NAME + "/" + todo.getId() + "? rev=" + todo.getRev(), null, new String[][] {}); } catch (JSONException e) { e.printStackTrace(); } } } refreshTodos();
- 45. Remote Push JSONObject obj = new JSONObject(); try { obj.put("create_target", true); obj.put("source", baseURL + DB_NAME); obj.put("target", "http:// hansamann.iriscouch.com/todo"); JSONObject result = AndCouch.post(baseURL + "_replicate", obj.toString()).json; } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); }
- 46. CouchApps
- 47. CouchApps • JavaScript and HTML5 apps served from CouchDB • No middle tier, Couch is DB + application server • CouchApp.org hosts the CouchApp development tool that pushes changes to a Couch instance
- 48. about Sven Haiges, hybris GmbH Twitter @hansamann Android, HTML5, Groovy & Grails [email protected]
- 49. about Sven Haiges, hybris GmbH Twitter @hansamann Android, HTML5, Groovy & Grails [email protected] NFC
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