CBL 101 Java

gistfile1.java

Page:
Link to the actual code of GrocerySync-Android:
Java File and Line:
Java Code snippet:

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- Page 18 : Initialization

- https://github.com/couchbaselabs/GrocerySync-Android/blob/master/GrocerySync-Android/src/main/java/com/couchbase/grocerysync/MainActivity.java#L343

- MainActivity.java#L343

// Initialize Manager
try {
	manager = new Manager(new AndroidContext(this), Manager.DEFAULT_OPTIONS);
} catch (IOException e) {
	Log.e(TAG, "Couldn't create Manager instance", e);
	return;
}

// Initialize Couchbase Lite and find/create my databaes
try {
	database = manager.getDatabase(DATABASE_NAME);
} catch (CouchbaseLiteException e) {
	Log.e(TAG, "Couldn't open database: " + DATABASE_NAME, e);
	return;
}


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- Page 23 : Adding New Items

- https://github.com/couchbaselabs/GrocerySync-Android/blob/master/GrocerySync-Android/src/main/java/com/couchbase/grocerysync/MainActivity.java#L343

- MainActivity.java#L343

// Create the new document's properties:
Map<String, Object> properties = new HashMap<String, Object>();
properties.put("text", text);
properties.put("check", Boolean.FALSE);
properties.put("created_at", currentTimeString);

// Save the document:
Document doc = database.createDocument();
try {
	doc.putProperties(properties);
} catch (CouchbaseLiteException e) {
    Log.e(TAG, "Couldn't save new item", e);
}

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- Page 25/28: Creating Database View

- https://github.com/couchbaselabs/GrocerySync-Android/blob/master/GrocerySync-Android/src/main/java/com/couchbase/grocerysync/MainActivity.java#L122

- MainActivity.java#L122

// Define a view with a map function that indexes to-­‐do items by creation date:
View viewItemsByDate = database.getView("byDate");
viewItemsByDate.setMap(new Mapper() {
    @Override
    public void map(Map<String, Object> document, Emitter emitter) {
        Object createdAt = document.get("created_at");
        if (createdAt != null) {
            emitter.emit(createdAt.toString(), document);
        }
    }
}, "1.1");

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- Page 29/33 : Driving the Table from a View Query

- https://github.com/couchbaselabs/GrocerySync-Android/blob/master/GrocerySync-Android/src/main/java/com/couchbase/grocerysync/MainActivity.java#L164

- MainActivity.java#L164

NOTE: This code snippet is hard to be identical with Objective-C. 

// Create a query sorted by descending date, i.e. newest items first:
LiveQuery liveQuery = view.createQuery().toLiveQuery();
liveQuery.setDescending(true);

// Set ChangeListener for LiveQuey
liveQuery.addChangeListener(new LiveQuery.ChangeListener() {
	public void changed(final LiveQuery.ChangeEvent event) {
		// Update UI
		runOnUiThread(new Runnable() {
			public void run() {
				grocerySyncArrayAdapter.clear();
				for (Iterator<QueryRow> it = event.getRows(); it.hasNext();) {
					grocerySyncArrayAdapter.add(it.next());
				}
				grocerySyncArrayAdapter.notifyDataSetChanged();
			}
		});
	}
});

// Start LiveQuery
liveQuery.start();

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- Page 34 : Displaying TableCells

- https://github.com/couchbaselabs/GrocerySync-Android/blob/a07edc012a9728e3a027982bb1b0c9795023c2cb/GrocerySync-Android/src/main/java/com/couchbase/grocerysync/GrocerySyncArrayAdapter.java#L33

- GrocerySyncArrayAdapter.java#L33

public View getView(int position, View itemView, ViewGroup parent) {
	...
	...
	TextView label = ((ViewHolder)itemView.getTag()).label;
	QueryRow row = getItem(position);
	SavedRevision currentRevision = row.getDocument().getCurrentRevision();
	// Check box
	Object check = (Object) currentRevision.getProperty("check");
	boolean isGroceryItemChecked = false;
	if (check != null && check instanceof Boolean)
	    isGroceryItemChecked = ((Boolean)check).booleanValue();
	// Text
	String groceryItemText = (String) currentRevision.getProperty("text");
	label.setText(groceryItemText);
	// Image
	ImageView icon = ((ViewHolder)itemView.getTag()).icon;
	if(isGroceryItemChecked)
	    icon.setImageResource(R.drawable.list_area___checkbox___checked);
	else
	    icon.setImageResource(R.drawable.list_area___checkbox___unchecked);


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- Page 35 : Responding To Taps

- https://github.com/couchbaselabs/GrocerySync-Android/blob/a07edc012a9728e3a027982bb1b0c9795023c2cb/GrocerySync-Android/src/main/java/com/couchbase/grocerysync/MainActivity.java#L243

- MainActivity.java#L243

// CALLED BY THE ListView (setOnItemClickListener at line 193)

public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
	// Ask AdapterView for the corresponding query row, and get its document:
	QueryRow row = (QueryRow) adapterView.getItemAtPosition(position);
	Document document = row.getDocument();

	// Toggle the document's 'checked' property:
	Map<String, Object> newProperties = new HashMap<String, Object>(document.getProperties());
	boolean checked = ((Boolean) newProperties.get("check")).booleanValue();
	newProperties.put("check", !checked);

	// Save changes:
	try {
		document.putProperties(newProperties);
	} catch (Exception e) {
		Toast.makeText(getApplicationContext(), "Failed to update item", Toast.LENGTH_LONG).show();
	}
}

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- Page 40 : Creating Replications

- https://github.com/couchbaselabs/GrocerySync-Android/blob/a07edc012a9728e3a027982bb1b0c9795023c2cb/GrocerySync-Android/src/main/java/com/couchbase/grocerysync/MainActivity.java#L133

- MainActivity.java#L133

URL syncUrl = new URL(SYNC_URL);
Replication pullReplication = database.createPullReplication(syncUrl);
Replication pushReplication = database.createPushReplication(syncUrl);
pullReplication.setContinuous(true);
pushReplication.setContinuous(true);
// Observe replication progress changes, in both directions:
pullReplication.addChangeListener(this);
pushReplication.addChangeListener(this);
pullReplication.start();
pushReplication.start();

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- Page 41 : Monitoring Replication

- https://github.com/couchbaselabs/GrocerySync-Android/blob/a07edc012a9728e3a027982bb1b0c9795023c2cb/GrocerySync-Android/src/main/java/com/couchbase/grocerysync/MainActivity.java#L371

- MainActivity.java#L371

public void changed(Replication.ChangeEvent event) {
	Replication replication = event.getSource();
	if (event.getSource().getStatus() != Replication.ReplicationStatus.REPLICATION_IDLE) {
		// Sync is active
		int completed = replication.getCompletedChangesCount();
	    int total = replication.getChangesCount();
	    String msg = String.format("Replicator completed %d / %d", completed, total);
	    Log.d(TAG, msg);
	} else {
		// Sync is idle
	    Log.d(TAG, "SYNC idle");
	}
	// Check for any change in error status
	if (event.getError() != null) {
		Log.e(TAG, "Error syncing", e);
	}
}