Demo: Split video Effect generation out of createTransformer.

PiperOrigin-RevId: 477524540

demos/transformer/src/main/java/com/google/android/exoplayer2/transformerdemo/TransformerActivity.java

@@ -272,11 +272,38 @@ public final class TransformerActivity extends AppCompatActivity {
                   .setEnableFallback(bundle.getBoolean(ConfigurationActivity.ENABLE_FALLBACK))
                   .setEnableFallback(bundle.getBoolean(ConfigurationActivity.ENABLE_FALLBACK))
                   .build());
                   .build());
 
 
-      ImmutableList.Builder<Effect> effects = new ImmutableList.Builder<>();
+      transformerBuilder.setVideoEffects(createVideoEffectsListFromBundle(bundle));
+
+      if (bundle.getBoolean(ConfigurationActivity.ENABLE_DEBUG_PREVIEW)) {
+        transformerBuilder.setDebugViewProvider(new DemoDebugViewProvider());
+      }
+    }
+    return transformerBuilder
+        .addListener(
+            new Transformer.Listener() {
+              @Override
+              public void onTransformationCompleted(
+                  MediaItem mediaItem, TransformationResult transformationResult) {
+                TransformerActivity.this.onTransformationCompleted(filePath);
+              }
+
+              @Override
+              public void onTransformationError(
+                  MediaItem mediaItem, TransformationException exception) {
+                TransformerActivity.this.onTransformationError(exception);
+              }
+            })
+        .build();
+  }
+
+  private ImmutableList<Effect> createVideoEffectsListFromBundle(Bundle bundle) {
     @Nullable
     @Nullable
     boolean[] selectedEffects =
     boolean[] selectedEffects =
         bundle.getBooleanArray(ConfigurationActivity.DEMO_EFFECTS_SELECTIONS);
         bundle.getBooleanArray(ConfigurationActivity.DEMO_EFFECTS_SELECTIONS);
-      if (selectedEffects != null) {
+    if (selectedEffects == null) {
+      return ImmutableList.of();
+    }
+    ImmutableList.Builder<Effect> effects = new ImmutableList.Builder<>();
     if (selectedEffects[0]) {
     if (selectedEffects[0]) {
       effects.add(MatrixTransformationFactory.createDizzyCropEffect());
       effects.add(MatrixTransformationFactory.createDizzyCropEffect());
     }
     }
@@ -328,8 +355,8 @@ public final class TransformerActivity extends AppCompatActivity {
           // uses a linear RGB color space internally. Meaning this is only for demonstration
           // uses a linear RGB color space internally. Meaning this is only for demonstration
           // purposes and it does not display a correct sepia frame.
           // purposes and it does not display a correct sepia frame.
           float[] sepiaMatrix = {
           float[] sepiaMatrix = {
-                0.393f, 0.349f, 0.272f, 0, 0.769f, 0.686f, 0.534f, 0, 0.189f, 0.168f, 0.131f, 0, 0,
-                0, 0, 1
+            0.393f, 0.349f, 0.272f, 0, 0.769f, 0.686f, 0.534f, 0, 0.189f, 0.168f, 0.131f, 0, 0, 0,
+            0, 1
           };
           };
           effects.add((RgbMatrix) (presentationTimeUs, useHdr) -> sepiaMatrix);
           effects.add((RgbMatrix) (presentationTimeUs, useHdr) -> sepiaMatrix);
           break;
           break;
@@ -366,8 +393,7 @@ public final class TransformerActivity extends AppCompatActivity {
       effects.add(
       effects.add(
           new HslAdjustment.Builder()
           new HslAdjustment.Builder()
               .adjustHue(bundle.getFloat(ConfigurationActivity.HSL_ADJUSTMENTS_HUE))
               .adjustHue(bundle.getFloat(ConfigurationActivity.HSL_ADJUSTMENTS_HUE))
-                  .adjustSaturation(
-                      bundle.getFloat(ConfigurationActivity.HSL_ADJUSTMENTS_SATURATION))
+              .adjustSaturation(bundle.getFloat(ConfigurationActivity.HSL_ADJUSTMENTS_SATURATION))
               .adjustLightness(bundle.getFloat(ConfigurationActivity.HSL_ADJUSTMENTS_LIGHTNESS))
               .adjustLightness(bundle.getFloat(ConfigurationActivity.HSL_ADJUSTMENTS_LIGHTNESS))
               .build());
               .build());
     }
     }
@@ -398,29 +424,7 @@ public final class TransformerActivity extends AppCompatActivity {
     if (selectedEffects[10]) {
     if (selectedEffects[10]) {
       effects.add(MatrixTransformationFactory.createZoomInTransition());
       effects.add(MatrixTransformationFactory.createZoomInTransition());
     }
     }
-        transformerBuilder.setVideoEffects(effects.build());
-      }
-
-      if (bundle.getBoolean(ConfigurationActivity.ENABLE_DEBUG_PREVIEW)) {
-        transformerBuilder.setDebugViewProvider(new DemoDebugViewProvider());
-      }
-    }
-    return transformerBuilder
-        .addListener(
-            new Transformer.Listener() {
-              @Override
-              public void onTransformationCompleted(
-                  MediaItem mediaItem, TransformationResult transformationResult) {
-                TransformerActivity.this.onTransformationCompleted(filePath);
-              }
-
-              @Override
-              public void onTransformationError(
-                  MediaItem mediaItem, TransformationException exception) {
-                TransformerActivity.this.onTransformationError(exception);
-              }
-            })
-        .build();
+    return effects.build();
   }
   }
 
 
   @RequiresNonNull({
   @RequiresNonNull({