-Added LeakCanary to debug build for memory detection on activities and fragments.

-Added LeakCanary no-op lib to release and beta builds.

app/build.gradle

@@ -89,4 +89,8 @@ dependencies {
 
     implementation 'frankiesardo:icepick:3.2.0'
     annotationProcessor 'frankiesardo:icepick-processor:3.2.0'
+
+    debugImplementation 'com.squareup.leakcanary:leakcanary-android:1.5.4'
+    betaImplementation 'com.squareup.leakcanary:leakcanary-android-no-op:1.5.4'
+    releaseImplementation 'com.squareup.leakcanary:leakcanary-android-no-op:1.5.4'
 }

app/src/debug/java/org/schabi/newpipe/DebugApp.java

@@ -4,6 +4,10 @@ import android.content.Context;
 import android.support.multidex.MultiDex;
 
 import com.facebook.stetho.Stetho;
+import com.squareup.leakcanary.LeakCanary;
+import com.squareup.leakcanary.RefWatcher;
+
+import java.util.concurrent.TimeUnit;
 
 public class DebugApp extends App {
     private static final String TAG = DebugApp.class.toString();
@@ -41,4 +45,11 @@ public class DebugApp extends App {
         // Initialize Stetho with the Initializer
         Stetho.initialize(initializer);
     }
+
+    @Override
+    protected RefWatcher installLeakCanary() {
+        return LeakCanary.refWatcher(this)
+                .watchDelay(5, TimeUnit.SECONDS)
+                .buildAndInstall();
+    }
 }

app/src/main/java/org/schabi/newpipe/App.java

@@ -10,6 +10,8 @@ import android.util.Log;
 import com.nostra13.universalimageloader.cache.memory.impl.LRULimitedMemoryCache;
 import com.nostra13.universalimageloader.core.ImageLoader;
 import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
+import com.squareup.leakcanary.LeakCanary;
+import com.squareup.leakcanary.RefWatcher;
 
 import org.acra.ACRA;
 import org.acra.config.ACRAConfiguration;
@@ -54,6 +56,7 @@ import io.reactivex.plugins.RxJavaPlugins;
 
 public class App extends Application {
     protected static final String TAG = App.class.toString();
+    private RefWatcher refWatcher;
 
     @SuppressWarnings("unchecked")
     private static final Class<? extends ReportSenderFactory>[] reportSenderFactoryClasses = new Class[]{AcraReportSenderFactory.class};
@@ -69,6 +72,13 @@ public class App extends Application {
     public void onCreate() {
         super.onCreate();
 
+        if (LeakCanary.isInAnalyzerProcess(this)) {
+            // This process is dedicated to LeakCanary for heap analysis.
+            // You should not init your app in this process.
+            return;
+        }
+        refWatcher = installLeakCanary();
+
         // Initialize settings first because others inits can use its values
         SettingsActivity.initSettings(this);
 
@@ -157,4 +167,12 @@ public class App extends Application {
         mNotificationManager.createNotificationChannel(mChannel);
     }
 
+    public static RefWatcher getRefWatcher(Context context) {
+        final App application = (App) context.getApplicationContext();
+        return application.refWatcher;
+    }
+
+    protected RefWatcher installLeakCanary() {
+        return RefWatcher.DISABLED;
+    }
 }

app/src/main/java/org/schabi/newpipe/BaseFragment.java

@@ -13,6 +13,7 @@ import android.view.View;
 import com.nostra13.universalimageloader.core.DisplayImageOptions;
 import com.nostra13.universalimageloader.core.ImageLoader;
 import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;
+import com.squareup.leakcanary.RefWatcher;
 
 import icepick.Icepick;
 
@@ -67,6 +68,13 @@ public abstract class BaseFragment extends Fragment {
     protected void onRestoreInstanceState(@NonNull Bundle savedInstanceState) {
     }
 
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        RefWatcher refWatcher = App.getRefWatcher(getActivity());
+        refWatcher.watch(this);
+    }
+
     /*//////////////////////////////////////////////////////////////////////////
     // Init
     //////////////////////////////////////////////////////////////////////////*/