WIP: Implement Google Play Billing

app/.gitignore

@@ -1,3 +1,4 @@
 /build
 crashlytics.properties
-*.apk
+*.apk
+google-services.json

app/build.gradle

@@ -73,7 +73,7 @@ android {
 }
 
 ext {
-    acraVersion = '5.1.3'
+    acraVersion = '5.2.0'
     support_version = "28.0.0"
 }
 

app/src/main/AndroidManifest.xml

@@ -5,6 +5,7 @@
 
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="com.android.vending.BILLING" />
 
     <application
         android:name=".MarkdownApplication"

app/src/main/java/com/wbrawner/simplemarkdown/AppModule.java

@@ -1,5 +1,7 @@
 package com.wbrawner.simplemarkdown;
 
+import android.content.Context;
+
 import com.wbrawner.simplemarkdown.model.MarkdownFile;
 import com.wbrawner.simplemarkdown.presentation.MarkdownPresenter;
 import com.wbrawner.simplemarkdown.presentation.MarkdownPresenterImpl;
@@ -15,6 +17,11 @@ import dagger.Provides;
 
 @Module
 public class AppModule {
+    private final Context context;
+
+    public AppModule(Context context) {
+        this.context = context;
+    }
     @Provides
     public MarkdownFile provideMarkdownFile() {
         return new MarkdownFile();
@@ -22,6 +29,6 @@ public class AppModule {
 
     @Provides @Singleton
     public MarkdownPresenter provideMarkdownPresenter(MarkdownFile file) {
-        return new MarkdownPresenterImpl(file);
+        return new MarkdownPresenterImpl(context.getApplicationContext(), file);
     }
 }

app/src/main/java/com/wbrawner/simplemarkdown/MarkdownApplication.java

@@ -67,7 +67,7 @@ public class MarkdownApplication extends Application {
     public void onCreate() {
         super.onCreate();
         component = DaggerAppComponent.builder()
-                .appModule(new AppModule())
+                .appModule(new AppModule(this))
                 .build();
     }
 
@@ -78,8 +78,6 @@ public class MarkdownApplication extends Application {
     @Override
     protected void attachBaseContext(Context base) {
         super.attachBaseContext(base);
-
-        // The following line triggers the initialization of ACRA
         ACRA.init(this);
     }
 }

app/src/main/java/com/wbrawner/simplemarkdown/presentation/MarkdownPresenter.java

@@ -3,13 +3,15 @@ package com.wbrawner.simplemarkdown.presentation;
 import android.content.Context;
 import android.net.Uri;
 
+import com.android.billingclient.api.BillingClientStateListener;
+import com.android.billingclient.api.PurchasesUpdatedListener;
 import com.wbrawner.simplemarkdown.view.MarkdownEditView;
 import com.wbrawner.simplemarkdown.view.MarkdownPreviewView;
 
 import java.io.File;
 import java.io.InputStream;
 
-public interface MarkdownPresenter {
+public interface MarkdownPresenter extends PurchasesUpdatedListener, BillingClientStateListener {
     File getFile();
     void loadMarkdown();
 

app/src/main/java/com/wbrawner/simplemarkdown/presentation/MarkdownPresenterImpl.java

@@ -5,7 +5,12 @@ import android.database.Cursor;
 import android.net.Uri;
 import android.os.Handler;
 import android.provider.OpenableColumns;
+import android.support.annotation.Nullable;
 
+import com.android.billingclient.api.BillingClient;
+import com.android.billingclient.api.BillingClientStateListener;
+import com.android.billingclient.api.Purchase;
+import com.android.billingclient.api.PurchasesUpdatedListener;
 import com.commonsware.cwac.anddown.AndDown;
 import com.wbrawner.simplemarkdown.model.MarkdownFile;
 import com.wbrawner.simplemarkdown.utility.Utils;
@@ -18,18 +23,27 @@ import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.InputStream;
+import java.util.List;
 
-public class MarkdownPresenterImpl implements MarkdownPresenter {
+public class MarkdownPresenterImpl
+        implements MarkdownPresenter, BillingClientStateListener, PurchasesUpdatedListener {
     private final Object fileLock = new Object();
     private MarkdownFile file;
     private volatile MarkdownEditView editView;
     private volatile MarkdownPreviewView previewView;
     private Handler fileHandler = new Handler();
+    private BillingClient billingClient;
 
-    public MarkdownPresenterImpl(MarkdownFile file) {
+    public MarkdownPresenterImpl(Context context, MarkdownFile file) {
         synchronized (fileLock) {
             this.file = file;
         }
+
+
+        billingClient = BillingClient.newBuilder(context.getApplicationContext())
+                .setListener(this)
+                .build();
+        billingClient.startConnection(this);
     }
 
     @Override
@@ -242,4 +256,24 @@ public class MarkdownPresenterImpl implements MarkdownPresenter {
             }
         }
     }
+
+    @Override
+    public void onBillingSetupFinished(int responseCode) {
+        if (responseCode != BillingClient.BillingResponse.OK) {
+            return;
+        }
+
+        // The billing client is ready. You can query purchases here.
+    }
+
+    @Override
+    public void onBillingServiceDisconnected() {
+        // TODO: Set a flag and just try again later
+        billingClient.startConnection(this);
+    }
+
+    @Override
+    public void onPurchasesUpdated(int responseCode, @Nullable List<Purchase> purchases) {
+
+    }
 }