Convert database quickstart to Kotlin

database/app/build.gradle

@@ -1,4 +1,8 @@
 apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+apply plugin: 'org.jetbrains.kotlin.android.extensions'
+
 check.dependsOn 'assembleDebugAndroidTest'
 
 android {
@@ -26,7 +30,15 @@ configurations.all {
     resolutionStrategy.force 'com.android.support:support-annotations:27.1.1'
 }
 
+androidExtensions {
+    experimental = true
+}
+
 dependencies {
+    implementation project(":internal:lintchecks")
+    implementation project(":internal:chooser")
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.2.61"
+
     implementation 'com.android.support:appcompat-v7:27.1.1'
     implementation 'com.android.support:recyclerview-v7:27.1.1'
     implementation 'com.android.support:cardview-v7:27.1.1'

database/app/proguard-rules.pro

@@ -21,10 +21,10 @@
 -keepattributes EnclosingMethod
 -keepattributes InnerClasses
 
--keep class com.google.firebase.quickstart.database.viewholder.** {
+-keep class com.google.firebase.quickstart.database.java.viewholder.** {
     *;
 }
 
--keepclassmembers class com.google.firebase.quickstart.database.models.** {
+-keepclassmembers class com.google.firebase.quickstart.database.java.models.** {
     *;
 }

database/app/src/androidTest/java/com/google/firebase/quickstart/database/NewPostTest.java

@@ -8,6 +8,8 @@
 import android.support.test.runner.AndroidJUnit4;
 import android.test.suitebuilder.annotation.LargeTest;
 
+import com.google.firebase.quickstart.database.java.SignInActivity;
+
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -46,50 +48,50 @@ public void newPostTest() {
 
         // Select email field
         ViewInteraction appCompatEditText = onView(
-                allOf(withId(R.id.field_email),
-                        withParent(withId(R.id.layout_email_password)),
+                allOf(withId(R.id.fieldEmail),
+                        withParent(withId(R.id.layoutEmailPassword)),
                         isDisplayed()));
         appCompatEditText.perform(click());
 
         // Enter email address
         ViewInteraction appCompatEditText2 = onView(
-                allOf(withId(R.id.field_email),
-                        withParent(withId(R.id.layout_email_password)),
+                allOf(withId(R.id.fieldEmail),
+                        withParent(withId(R.id.layoutEmailPassword)),
                         isDisplayed()));
         appCompatEditText2.perform(replaceText(email));
 
         // Enter password
         ViewInteraction appCompatEditText3 = onView(
-                allOf(withId(R.id.field_password),
-                        withParent(withId(R.id.layout_email_password)),
+                allOf(withId(R.id.fieldPassword),
+                        withParent(withId(R.id.layoutEmailPassword)),
                         isDisplayed()));
         appCompatEditText3.perform(replaceText(password));
 
         // Click sign up
         ViewInteraction appCompatButton = onView(
-                allOf(withId(R.id.button_sign_up), withText(R.string.sign_up),
-                        withParent(withId(R.id.layout_buttons)),
+                allOf(withId(R.id.buttonSignUp), withText(R.string.sign_up),
+                        withParent(withId(R.id.layoutButtons)),
                         isDisplayed()));
         appCompatButton.perform(click());
 
         // Click new post button
         ViewInteraction floatingActionButton = onView(
-                allOf(withId(R.id.fab_new_post), isDisplayed()));
+                allOf(withId(R.id.fabNewPost), isDisplayed()));
         floatingActionButton.perform(click());
 
         // Enter post title
         ViewInteraction appCompatEditText4 = onView(
-                allOf(withId(R.id.field_title), isDisplayed()));
+                allOf(withId(R.id.fieldTitle), isDisplayed()));
         appCompatEditText4.perform(replaceText(postTitle));
 
         // Enter post content
         ViewInteraction appCompatEditText5 = onView(
-                allOf(withId(R.id.field_body), isDisplayed()));
+                allOf(withId(R.id.fieldBody), isDisplayed()));
         appCompatEditText5.perform(replaceText(postContent));
 
         // Click submit button
         ViewInteraction floatingActionButton2 = onView(
-                allOf(withId(R.id.fab_submit_post), isDisplayed()));
+                allOf(withId(R.id.fabSubmitPost), isDisplayed()));
         floatingActionButton2.perform(click());
 
         // Navigate to "My Posts"
@@ -99,18 +101,18 @@ public void newPostTest() {
 
         // Check that the title is correct
         ViewInteraction textView = onView(
-                allOf(withId(R.id.post_title), withText(postTitle), isDisplayed()));
+                allOf(withId(R.id.postTitle), withText(postTitle), isDisplayed()));
         textView.check(matches(withText(postTitle)));
 
         // Check that the content is correct
         ViewInteraction textView2 = onView(
-                allOf(withId(R.id.post_body), withText(postContent), isDisplayed()));
+                allOf(withId(R.id.postBody), withText(postContent), isDisplayed()));
         textView2.check(matches(withText(postContent)));
 
         // Check that it has zero stars
         ViewInteraction textView3 = onView(
-                allOf(withId(R.id.post_num_stars), withText("0"),
-                        withParent(withId(R.id.star_layout)),
+                allOf(withId(R.id.postNumStars), withText("0"),
+                        withParent(withId(R.id.starLayout)),
                         isDisplayed()));
         textView3.check(matches(withText("0")));
 

database/app/src/main/AndroidManifest.xml

@@ -8,19 +8,33 @@
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity
-            android:name=".MainActivity"
-            android:label="@string/app_name"
-            android:theme="@style/AppTheme" />
-        <activity android:name=".NewPostActivity" />
-        <activity android:name=".SignInActivity">
+
+        <activity android:name=".EntryChoiceActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
-        <activity android:name=".PostDetailActivity"></activity>
+
+        <activity
+            android:name=".java.MainActivity"
+            android:label="@string/app_name"
+            android:theme="@style/AppTheme" />
+
+        <activity
+            android:name=".kotlin.MainActivity"
+            android:label="@string/app_name"
+            android:theme="@style/AppTheme" />
+
+        <activity android:name=".java.SignInActivity" />
+        <activity android:name=".kotlin.SignInActivity" />
+
+        <activity android:name=".java.NewPostActivity" />
+        <activity android:name=".kotlin.NewPostActivity" />
+
+        <activity android:name=".java.PostDetailActivity" />
+        <activity android:name=".kotlin.PostDetailActivity" />
     </application>
 
 </manifest>

database/app/src/main/java/com/google/firebase/quickstart/database/EntryChoiceActivity.kt

@@ -0,0 +1,22 @@
+package com.google.firebase.quickstart.database
+
+import android.content.Intent
+import com.firebase.example.internal.BaseEntryChoiceActivity
+import com.firebase.example.internal.Choice
+
+class EntryChoiceActivity : BaseEntryChoiceActivity() {
+
+    override fun getChoices(): List<Choice> {
+        return listOf(
+                Choice(
+                        "Java",
+                        "Run the Firebase Realtime Database quickstart written in Java.",
+                        Intent(this, com.google.firebase.quickstart.database.java.MainActivity::class.java)),
+                Choice(
+                        "Kotlin",
+                        "Run the Firebase Realtime Database quickstart written in Kotlin.",
+                        Intent(this, com.google.firebase.quickstart.database.kotlin.MainActivity::class.java))
+        )
+    }
+
+}

database/app/src/main/java/com/google/firebase/quickstart/database/BaseActivity.java → database/app/src/main/java/com/google/firebase/quickstart/database/java/BaseActivity.java

@@ -1,4 +1,4 @@
-package com.google.firebase.quickstart.database;
+package com.google.firebase.quickstart.database.java;
 
 import android.app.ProgressDialog;
 import android.support.v7.app.AppCompatActivity;

database/app/src/main/java/com/google/firebase/quickstart/database/MainActivity.java → database/app/src/main/java/com/google/firebase/quickstart/database/java/MainActivity.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.google.firebase.quickstart.database;
+package com.google.firebase.quickstart.database.java;
 
 import android.content.Intent;
 import android.os.Bundle;
@@ -27,9 +27,10 @@
 import android.view.View;
 
 import com.google.firebase.auth.FirebaseAuth;
-import com.google.firebase.quickstart.database.fragment.MyPostsFragment;
-import com.google.firebase.quickstart.database.fragment.MyTopPostsFragment;
-import com.google.firebase.quickstart.database.fragment.RecentPostsFragment;
+import com.google.firebase.quickstart.database.R;
+import com.google.firebase.quickstart.database.java.fragment.MyPostsFragment;
+import com.google.firebase.quickstart.database.java.fragment.MyTopPostsFragment;
+import com.google.firebase.quickstart.database.java.fragment.RecentPostsFragment;
 
 public class  MainActivity extends BaseActivity {
 
@@ -75,7 +76,7 @@ public CharSequence getPageTitle(int position) {
         tabLayout.setupWithViewPager(mViewPager);
 
         // Button launches NewPostActivity
-        findViewById(R.id.fab_new_post).setOnClickListener(new View.OnClickListener() {
+        findViewById(R.id.fabNewPost).setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 startActivity(new Intent(MainActivity.this, NewPostActivity.class));

database/app/src/main/java/com/google/firebase/quickstart/database/NewPostActivity.java → database/app/src/main/java/com/google/firebase/quickstart/database/java/NewPostActivity.java

@@ -1,4 +1,4 @@
-package com.google.firebase.quickstart.database;
+package com.google.firebase.quickstart.database.java;
 
 import android.os.Bundle;
 import android.support.design.widget.FloatingActionButton;
@@ -13,8 +13,9 @@
 import com.google.firebase.database.DatabaseReference;
 import com.google.firebase.database.FirebaseDatabase;
 import com.google.firebase.database.ValueEventListener;
-import com.google.firebase.quickstart.database.models.Post;
-import com.google.firebase.quickstart.database.models.User;
+import com.google.firebase.quickstart.database.R;
+import com.google.firebase.quickstart.database.java.models.Post;
+import com.google.firebase.quickstart.database.java.models.User;
 
 import java.util.HashMap;
 import java.util.Map;
@@ -41,9 +42,9 @@ protected void onCreate(Bundle savedInstanceState) {
         mDatabase = FirebaseDatabase.getInstance().getReference();
         // [END initialize_database_ref]
 
-        mTitleField = findViewById(R.id.field_title);
-        mBodyField = findViewById(R.id.field_body);
-        mSubmitButton = findViewById(R.id.fab_submit_post);
+        mTitleField = findViewById(R.id.fieldTitle);
+        mBodyField = findViewById(R.id.fieldBody);
+        mSubmitButton = findViewById(R.id.fabSubmitPost);
 
         mSubmitButton.setOnClickListener(new View.OnClickListener() {
             @Override

database/app/src/main/java/com/google/firebase/quickstart/database/PostDetailActivity.java → database/app/src/main/java/com/google/firebase/quickstart/database/java/PostDetailActivity.java

@@ -1,4 +1,4 @@
-package com.google.firebase.quickstart.database;
+package com.google.firebase.quickstart.database.java;
 
 import android.content.Context;
 import android.os.Bundle;
@@ -19,9 +19,10 @@
 import com.google.firebase.database.DatabaseReference;
 import com.google.firebase.database.FirebaseDatabase;
 import com.google.firebase.database.ValueEventListener;
-import com.google.firebase.quickstart.database.models.User;
-import com.google.firebase.quickstart.database.models.Comment;
-import com.google.firebase.quickstart.database.models.Post;
+import com.google.firebase.quickstart.database.R;
+import com.google.firebase.quickstart.database.java.models.User;
+import com.google.firebase.quickstart.database.java.models.Comment;
+import com.google.firebase.quickstart.database.java.models.Post;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -63,12 +64,12 @@ protected void onCreate(Bundle savedInstanceState) {
                 .child("post-comments").child(mPostKey);
 
         // Initialize Views
-        mAuthorView = findViewById(R.id.post_author);
-        mTitleView = findViewById(R.id.post_title);
-        mBodyView = findViewById(R.id.post_body);
-        mCommentField = findViewById(R.id.field_comment_text);
-        mCommentButton = findViewById(R.id.button_post_comment);
-        mCommentsRecycler = findViewById(R.id.recycler_comments);
+        mAuthorView = findViewById(R.id.postAuthor);
+        mTitleView = findViewById(R.id.postTitle);
+        mBodyView = findViewById(R.id.postBody);
+        mCommentField = findViewById(R.id.fieldCommentText);
+        mCommentButton = findViewById(R.id.buttonPostComment);
+        mCommentsRecycler = findViewById(R.id.recyclerPostComments);
 
         mCommentButton.setOnClickListener(this);
         mCommentsRecycler.setLayoutManager(new LinearLayoutManager(this));
@@ -130,7 +131,7 @@ public void onStop() {
     @Override
     public void onClick(View v) {
         int i = v.getId();
-        if (i == R.id.button_post_comment) {
+        if (i == R.id.buttonPostComment) {
             postComment();
         }
     }
@@ -171,8 +172,8 @@ private static class CommentViewHolder extends RecyclerView.ViewHolder {
         public CommentViewHolder(View itemView) {
             super(itemView);
 
-            authorView = itemView.findViewById(R.id.comment_author);
-            bodyView = itemView.findViewById(R.id.comment_body);
+            authorView = itemView.findViewById(R.id.commentAuthor);
+            bodyView = itemView.findViewById(R.id.commentBody);
         }
     }
 

database/app/src/main/java/com/google/firebase/quickstart/database/SignInActivity.java → database/app/src/main/java/com/google/firebase/quickstart/database/java/SignInActivity.java

@@ -1,4 +1,4 @@
-package com.google.firebase.quickstart.database;
+package com.google.firebase.quickstart.database.java;
 
 import android.content.Intent;
 import android.os.Bundle;
@@ -17,7 +17,8 @@
 import com.google.firebase.auth.FirebaseUser;
 import com.google.firebase.database.DatabaseReference;
 import com.google.firebase.database.FirebaseDatabase;
-import com.google.firebase.quickstart.database.models.User;
+import com.google.firebase.quickstart.database.R;
+import com.google.firebase.quickstart.database.java.models.User;
 
 public class SignInActivity extends BaseActivity implements View.OnClickListener {
 
@@ -40,10 +41,10 @@ protected void onCreate(Bundle savedInstanceState) {
         mAuth = FirebaseAuth.getInstance();
 
         // Views
-        mEmailField = findViewById(R.id.field_email);
-        mPasswordField = findViewById(R.id.field_password);
-        mSignInButton = findViewById(R.id.button_sign_in);
-        mSignUpButton = findViewById(R.id.button_sign_up);
+        mEmailField = findViewById(R.id.fieldEmail);
+        mPasswordField = findViewById(R.id.fieldPassword);
+        mSignInButton = findViewById(R.id.buttonSignIn);
+        mSignUpButton = findViewById(R.id.buttonSignUp);
 
         // Click listeners
         mSignInButton.setOnClickListener(this);
@@ -163,9 +164,9 @@ private void writeNewUser(String userId, String name, String email) {
     @Override
     public void onClick(View v) {
         int i = v.getId();
-        if (i == R.id.button_sign_in) {
+        if (i == R.id.buttonSignIn) {
             signIn();
-        } else if (i == R.id.button_sign_up) {
+        } else if (i == R.id.buttonSignUp) {
             signUp();
         }
     }

database/app/src/main/java/com/google/firebase/quickstart/database/fragment/MyPostsFragment.java → database/app/src/main/java/com/google/firebase/quickstart/database/java/fragment/MyPostsFragment.java

@@ -1,4 +1,4 @@
-package com.google.firebase.quickstart.database.fragment;
+package com.google.firebase.quickstart.database.java.fragment;
 
 import com.google.firebase.database.DatabaseReference;
 import com.google.firebase.database.Query;

database/app/src/main/java/com/google/firebase/quickstart/database/fragment/MyTopPostsFragment.java → database/app/src/main/java/com/google/firebase/quickstart/database/java/fragment/MyTopPostsFragment.java

@@ -1,4 +1,4 @@
-package com.google.firebase.quickstart.database.fragment;
+package com.google.firebase.quickstart.database.java.fragment;
 
 import com.google.firebase.database.DatabaseReference;
 import com.google.firebase.database.Query;