Android Open Source - Android-DDP Main Activity

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License

The source code is released under:

Apache License

Java Source Code

package im.delight.android.ddp.firebase.examples;
/*  w  ww.  ja v a 2s.  c o m*/
/**
 * Copyright 2014 www.delight.im <info@delight.im>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import android.content.Context;
import im.delight.android.ddp.firebase.ServerValue;
import im.delight.android.ddp.firebase.ChildEventListener;
import im.delight.android.ddp.firebase.DataSnapshot;
import im.delight.android.ddp.firebase.ValueEventListener;
import java.util.Map;
import java.util.HashMap;
import android.widget.Toast;
import im.delight.android.ddp.firebase.FirebaseError;
import im.delight.android.ddp.firebase.Firebase.CompletionListener;
import im.delight.android.ddp.firebase.Firebase;
import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

  private static final String SERVER_URL = "ws://example.meteor.com/websocket";
  private Context context;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    context = getApplicationContext();

    // set the Android context (which has no effect here and is only there for compatibility)
    Firebase.setAndroidContext(this);

    // create the first reference to the server's URL
    Firebase mainRef = new Firebase(SERVER_URL);

    // create another reference to a child node
    Firebase usersRef = mainRef.child("users");

    // write data to a child node
    usersRef.child("jane_doe").setValue("Jane Doe", 2.5f);

    // access a location directly from URL and remove the value
    new Firebase(SERVER_URL+"/some/outdated/child").removeValue();

    // watch the connection state
    Firebase connectedState = new Firebase(SERVER_URL+"/.info/connected");
    connectedState.addValueEventListener(new ValueEventListener() {

      @Override
      public void onDataChange(DataSnapshot snapshot) {
        final boolean connected = snapshot.getValue(Boolean.class);
        final String status = connected ? "connected" : "disconnected";
        Toast.makeText(context, "Connectivity changed: "+status, Toast.LENGTH_SHORT).show();
      }

      @Override
      public void onCancelled(FirebaseError error) { }

    });

    // get the offset from local time to server time
    new Firebase(SERVER_URL+"/.info/serverTimeOffset").addValueEventListener(new ValueEventListener() {

      @Override
      public void onDataChange(DataSnapshot snapshot) {
        Toast.makeText(context, "Server time offset received: "+snapshot.getValue(Long.class), Toast.LENGTH_SHORT).show();
      }

      @Override
      public void onCancelled(FirebaseError error) { }

    });

    // subscribe to updates in the `users` location
    usersRef.addChildEventListener(new ChildEventListener() {

      @Override
      public void onChildAdded(DataSnapshot snapshot, String previousChildName) {
        Toast.makeText(context, "Child added on reference `"+snapshot.getKey()+"`", Toast.LENGTH_SHORT).show();
      }

      @Override
      public void onChildChanged(DataSnapshot snapshot, String previousChildName) {
        Toast.makeText(context, "Child changed on reference `"+snapshot.getKey()+"`", Toast.LENGTH_SHORT).show();
      }

      @Override
      public void onChildRemoved(DataSnapshot snapshot) {
        Toast.makeText(context, "Child removed on reference `"+snapshot.getKey()+"`", Toast.LENGTH_SHORT).show();
      }

      @Override
      public void onChildMoved(DataSnapshot snapshot, String previousChildName) {
        Toast.makeText(context, "Child moved on reference `"+snapshot.getKey()+"`", Toast.LENGTH_SHORT).show();
      }

      @Override
      public void onCancelled(FirebaseError error) { }

    });

    // write several children at once in a given location
    Map<String, Object> johnDoeData = new HashMap<String, Object>();
    johnDoeData.put("score", 1024);
    johnDoeData.put("active", false);
    johnDoeData.put("last_online", ServerValue.TIMESTAMP);
    usersRef.child("john_doe").updateChildren(johnDoeData, new CompletionListener() {

      @Override
      public void onComplete(FirebaseError error, Firebase ref) {
        String response = "Listener on `"+ref.getKey()+"` completed "+(error != null ? "with an error" : "successfully");
        Toast.makeText(context, response, Toast.LENGTH_SHORT).show();
      }

    });

    // write a node's priority only
    usersRef.child("john_doe").child("score").setPriority(500);

    // create an automatically named child with `push()`
    final Firebase pushedRef = usersRef.getParent().child("randomEntries").push();

    // read a plain Java object (POJO) from storage
    pushedRef.addListenerForSingleValueEvent(new ValueEventListener() {

      @Override
      public void onDataChange(DataSnapshot snapshot) {
        PersonBean personBean = snapshot.getValue(PersonBean.class);
        Toast.makeText(context, "PersonBean received: "+personBean, Toast.LENGTH_SHORT).show();
      }

      @Override
      public void onCancelled(FirebaseError error) { }

    });

    // write a plain Java object (POJO) to the storage that will be serialized automatically
    PersonBean personBean = new PersonBean();
    personBean.name = "John Doe";
    personBean.age = 42;
    personBean.location = "Example City";
    pushedRef.setValue(personBean);
  }

  @Override
  public void onDestroy() {
    super.onDestroy();

    // manually force the client to disconnect
    Firebase.goOffline();
  }

}

Java Source Code List

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