Re-organize sample and clear memory leaks

Change-Id: I56d8d2ab1b1fa32c15bfcd8fcdc61f20f4973949

Author: samtstern

app/src/main/AndroidManifest.xml

@@ -20,7 +20,7 @@
 
         <!-- Chat demo -->
         <activity
-            android:name=".ChatActivity"
+            android:name=".database.ChatActivity"
             android:label="@string/name_chat" />
 
         <!-- Auth UI demo -->
@@ -33,4 +33,4 @@
             android:label="@string/name_auth_ui" />
     </application>
 
-</manifest>
+</manifest>

app/src/main/java/com/firebase/uidemo/ChooserActivity.java

@@ -26,6 +26,7 @@
 import android.widget.TextView;
 
 import com.firebase.uidemo.auth.AuthUiActivity;
+import com.firebase.uidemo.database.ChatActivity;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;

app/src/main/java/com/firebase/uidemo/ChatActivity.java renamed to app/src/main/java/com/firebase/uidemo/database/ChatActivity.java

@@ -12,7 +12,7 @@
  * limitations under the License.
  */
 
-package com.firebase.uidemo;
+package com.firebase.uidemo.database;
 
 import android.graphics.PorterDuff;
 import android.graphics.drawable.GradientDrawable;
@@ -35,6 +35,7 @@
 import android.widget.Toast;
 
 import com.firebase.ui.database.FirebaseRecyclerAdapter;
+import com.firebase.uidemo.R;
 import com.google.android.gms.tasks.OnCompleteListener;
 import com.google.android.gms.tasks.Task;
 import com.google.firebase.auth.AuthResult;
@@ -45,7 +46,7 @@
 import com.google.firebase.database.FirebaseDatabase;
 import com.google.firebase.database.Query;
 
-public class ChatActivity extends AppCompatActivity {
+public class ChatActivity extends AppCompatActivity implements FirebaseAuth.AuthStateListener {
 
     public static final String TAG = "RecyclerViewDemo";
 
@@ -65,12 +66,7 @@ protected void onCreate(Bundle savedInstanceState) {
         setContentView(R.layout.activity_chat);
 
         mAuth = FirebaseAuth.getInstance();
-        mAuth.addAuthStateListener(new FirebaseAuth.AuthStateListener() {
-            @Override
-            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
-                updateUI();
-            }
-        });
+        mAuth.addAuthStateListener(this);
 
         mSendButton = (Button) findViewById(R.id.sendButton);
         mMessageEdit = (EditText) findViewById(R.id.messageEdit);
@@ -129,6 +125,19 @@ public void onStop() {
         }
     }
 
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        if (mAuth != null) {
+            mAuth.removeAuthStateListener(this);
+        }
+    }
+
+    @Override
+    public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
+        updateUI();
+    }
+
     private void attachRecyclerViewAdapter() {
         Query lastFifty = mChatRef.limitToLast(50);
         mRecyclerViewAdapter = new FirebaseRecyclerAdapter<Chat, ChatHolder>(
@@ -236,13 +245,13 @@ public void setIsSender(Boolean isSender) {
 
                 left_arrow.setVisibility(View.GONE);
                 right_arrow.setVisibility(View.VISIBLE);
-                messageContainer.setGravity(Gravity.RIGHT);
+                messageContainer.setGravity(Gravity.END);
             } else {
-                color = ContextCompat.getColor(mView.getContext(), R.color.material_grey_300);
+                color = ContextCompat.getColor(mView.getContext(), R.color.material_gray_300);
 
                 left_arrow.setVisibility(View.VISIBLE);
                 right_arrow.setVisibility(View.GONE);
-                messageContainer.setGravity(Gravity.LEFT);
+                messageContainer.setGravity(Gravity.START);
             }
 
             ((GradientDrawable) message.getBackground()).setColor(color);

app/src/main/res/layout/activity_chat.xml

@@ -4,7 +4,7 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
 
-    tools:context=".ChatActivity">
+    tools:context=".database.ChatActivity">
 
     <android.support.v7.widget.RecyclerView
         android:id="@+id/messagesList"

app/src/main/res/values/colors.xml

@@ -1,4 +1,4 @@
-<resources>
+<resources xmlns:tools="http://schemas.android.com/tools">
     <color name="colorPrimary">#039BE5</color>
     <color name="colorPrimaryDark">#0288D1</color>
     <color name="colorAccent">#FFA000</color>
@@ -14,7 +14,7 @@
     <color name="material_green_300">#AED581</color>
     <color name="material_green_a200">#69F0AE</color>
 
-    <color name="material_grey_300">#E0E0E0</color>
+    <color name="material_gray_300">#E0E0E0</color>
 
     <color name="material_lime_50">#F9FBE7</color>
     <color name="material_lime_a700">#AEEA00</color>
@@ -23,4 +23,4 @@
     <color name="material_purple_a700">#AA00FF</color>
 
     <color name="material_red_a200">#FF5252</color>
-</resources>
+</resources>