Fix download dialog selector layout and add some tests

app/src/androidTest/java/org/schabi/newpipe/util/StreamItemAdapterTest.kt

@@ -0,0 +1,187 @@
+package org.schabi.newpipe.util
+
+import android.content.Context
+import android.util.SparseArray
+import android.view.View
+import android.view.View.GONE
+import android.view.View.INVISIBLE
+import android.view.View.VISIBLE
+import android.widget.Spinner
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.MediumTest
+import androidx.test.internal.runner.junit4.statement.UiThreadStatement
+import org.hamcrest.MatcherAssert.assertThat
+import org.hamcrest.Matchers.`is`
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.schabi.newpipe.R
+import org.schabi.newpipe.extractor.MediaFormat
+import org.schabi.newpipe.extractor.stream.AudioStream
+import org.schabi.newpipe.extractor.stream.Stream
+import org.schabi.newpipe.extractor.stream.SubtitlesStream
+import org.schabi.newpipe.extractor.stream.VideoStream
+
+@MediumTest
+@RunWith(AndroidJUnit4::class)
+class StreamItemAdapterTest {
+    private lateinit var context: Context
+    private lateinit var spinner: Spinner
+
+    @Before
+    fun setUp() {
+        context = ApplicationProvider.getApplicationContext()
+        UiThreadStatement.runOnUiThread {
+            spinner = Spinner(context)
+        }
+    }
+
+    @Test
+    fun videoStreams_noSecondaryStream() {
+        val adapter = StreamItemAdapter<VideoStream, AudioStream>(
+            context,
+            getVideoStreams(true, true, true, true),
+            null
+        )
+
+        spinner.adapter = adapter
+        assertIconVisibility(spinner, 0, VISIBLE, VISIBLE)
+        assertIconVisibility(spinner, 1, VISIBLE, VISIBLE)
+        assertIconVisibility(spinner, 2, VISIBLE, VISIBLE)
+        assertIconVisibility(spinner, 3, VISIBLE, VISIBLE)
+    }
+
+    @Test
+    fun videoStreams_hasSecondaryStream() {
+        val adapter = StreamItemAdapter(
+            context,
+            getVideoStreams(false, true, false, true),
+            getAudioStreams(false, true, false, true)
+        )
+
+        spinner.adapter = adapter
+        assertIconVisibility(spinner, 0, GONE, GONE)
+        assertIconVisibility(spinner, 1, GONE, GONE)
+        assertIconVisibility(spinner, 2, GONE, GONE)
+        assertIconVisibility(spinner, 3, GONE, GONE)
+    }
+
+    @Test
+    fun videoStreams_Mixed() {
+        val adapter = StreamItemAdapter(
+            context,
+            getVideoStreams(true, true, true, true, true, false, true, true),
+            getAudioStreams(false, true, false, false, false, true, true, true)
+        )
+
+        spinner.adapter = adapter
+        assertIconVisibility(spinner, 0, VISIBLE, VISIBLE)
+        assertIconVisibility(spinner, 1, GONE, INVISIBLE)
+        assertIconVisibility(spinner, 2, VISIBLE, VISIBLE)
+        assertIconVisibility(spinner, 3, VISIBLE, VISIBLE)
+        assertIconVisibility(spinner, 4, VISIBLE, VISIBLE)
+        assertIconVisibility(spinner, 5, GONE, INVISIBLE)
+        assertIconVisibility(spinner, 6, GONE, INVISIBLE)
+        assertIconVisibility(spinner, 7, GONE, INVISIBLE)
+    }
+
+    @Test
+    fun subtitleStreams_noIcon() {
+        val adapter = StreamItemAdapter<SubtitlesStream, Stream>(
+            context,
+            StreamItemAdapter.StreamSizeWrapper(
+                (0 until 5).map {
+                    SubtitlesStream(MediaFormat.SRT, "pt-BR", "https://example.com", false)
+                },
+                context
+            ),
+            null
+        )
+        spinner.adapter = adapter
+        for (i in 0 until spinner.count) {
+            assertIconVisibility(spinner, i, GONE, GONE)
+        }
+    }
+
+    @Test
+    fun audioStreams_noIcon() {
+        val adapter = StreamItemAdapter<AudioStream, Stream>(
+            context,
+            StreamItemAdapter.StreamSizeWrapper(
+                (0 until 5).map { AudioStream("https://example.com/$it", MediaFormat.OPUS, 192) },
+                context
+            ),
+            null
+        )
+        spinner.adapter = adapter
+        for (i in 0 until spinner.count) {
+            assertIconVisibility(spinner, i, GONE, GONE)
+        }
+    }
+
+    /**
+     * @return a list of video streams, in which their video only property mirrors the provided
+     * [videoOnly] vararg.
+     */
+    private fun getVideoStreams(vararg videoOnly: Boolean) =
+        StreamItemAdapter.StreamSizeWrapper(
+            videoOnly.map {
+                VideoStream("https://example.com", MediaFormat.MPEG_4, "720p", it)
+            },
+            context
+        )
+
+    /**
+     * @return a list of audio streams, containing valid and null elements mirroring the provided
+     * [shouldBeValid] vararg.
+     */
+    private fun getAudioStreams(vararg shouldBeValid: Boolean) =
+        getSecondaryStreamsFromList(
+            shouldBeValid.map {
+                if (it) AudioStream("https://example.com", MediaFormat.OPUS, 192)
+                else null
+            }
+        )
+
+    /**
+     * Checks whether the item at [position] in the [spinner] has the correct icon visibility when
+     * it is shown in normal mode (selected) and in dropdown mode (user is choosing one of a list).
+     */
+    private fun assertIconVisibility(
+        spinner: Spinner,
+        position: Int,
+        normalVisibility: Int,
+        dropDownVisibility: Int
+    ) {
+        spinner.setSelection(position)
+        spinner.adapter.getView(position, null, spinner).run {
+            assertThat(
+                "normal visibility (pos=[$position])",
+                findViewById<View>(R.id.wo_sound_icon).visibility, `is`(normalVisibility)
+            )
+        }
+        spinner.adapter.getDropDownView(position, null, spinner).run {
+            assertThat(
+                "drop down visibility (pos=[$position])",
+                findViewById<View>(R.id.wo_sound_icon).visibility, `is`(dropDownVisibility)
+            )
+        }
+    }
+
+    /**
+     * Helper function that builds a secondary stream list.
+     */
+    private fun <T : Stream> getSecondaryStreamsFromList(streams: List<T?>) =
+        SparseArray<SecondaryStreamHelper<T>?>(streams.size).apply {
+            streams.forEachIndexed { index, stream ->
+                val secondaryStreamHelper: SecondaryStreamHelper<T>? = stream?.let {
+                    SecondaryStreamHelper(
+                        StreamItemAdapter.StreamSizeWrapper(streams, context),
+                        it
+                    )
+                }
+                put(index, secondaryStreamHelper)
+            }
+        }
+}

app/src/main/java/org/schabi/newpipe/util/StreamItemAdapter.java

@@ -42,16 +42,20 @@ public class StreamItemAdapter<T extends Stream, U extends Stream> extends BaseA
     private final StreamSizeWrapper<T> streamsWrapper;
     private final SparseArray<SecondaryStreamHelper<U>> secondaryStreams;
 
+    /**
+     * Indicates that at least one of the primary streams is an instance of {@link VideoStream},
+     * has no audio ({@link VideoStream#isVideoOnly()} returns true) and has no secondary stream
+     * associated with it.
+     */
+    private final boolean hasVideoOnlyWithNoSecondaryStream;
+
     public StreamItemAdapter(final Context context, final StreamSizeWrapper<T> streamsWrapper,
                              final SparseArray<SecondaryStreamHelper<U>> secondaryStreams) {
         this.context = context;
         this.streamsWrapper = streamsWrapper;
         this.secondaryStreams = secondaryStreams;
-    }
 
-    public StreamItemAdapter(final Context context, final StreamSizeWrapper<T> streamsWrapper,
+        this.hasVideoOnlyWithNoSecondaryStream = checkHasVideoOnlyWithNoSecondaryStream();
-                             final boolean showIconNoAudio) {
-        this(context, streamsWrapper, showIconNoAudio ? new SparseArray<>() : null);
     }
 
     public StreamItemAdapter(final Context context, final StreamSizeWrapper<T> streamsWrapper) {
@@ -115,10 +119,15 @@ public class StreamItemAdapter<T extends Stream, U extends Stream> extends BaseA
             final VideoStream videoStream = ((VideoStream) stream);
             qualityString = videoStream.getResolution();
 
-            if (secondaryStreams != null) {
+            if (hasVideoOnlyWithNoSecondaryStream) {
                 if (videoStream.isVideoOnly()) {
-                    woSoundIconVisibility = secondaryStreams.get(position) == null ? View.VISIBLE
+                    woSoundIconVisibility = hasSecondaryStream(position)
-                            : View.INVISIBLE;
+                            // It has a secondary stream associated with it, so check if it's a
+                            // dropdown view so it doesn't look out of place (missing margin)
+                            // compared to those that don't.
+                            ? (isDropdownItem ? View.INVISIBLE : View.GONE)
+                            // It doesn't have a secondary stream, icon is visible no matter what.
+                            : View.VISIBLE;
                 } else if (isDropdownItem) {
                     woSoundIconVisibility = View.INVISIBLE;
                 }
@@ -167,6 +176,32 @@ public class StreamItemAdapter<T extends Stream, U extends Stream> extends BaseA
         return convertView;
     }
 
+    /**
+     * @param position which primary stream to check.
+     * @return whether the primary stream at position has a secondary stream associated with it.
+     */
+    private boolean hasSecondaryStream(final int position) {
+        return secondaryStreams != null && secondaryStreams.get(position) != null;
+    }
+
+    /**
+     * @return if there are any video-only streams with no secondary stream associated with them.
+     * @see #hasVideoOnlyWithNoSecondaryStream
+     */
+    private boolean checkHasVideoOnlyWithNoSecondaryStream() {
+        for (int i = 0; i < streamsWrapper.getStreamsList().size(); i++) {
+            final T stream = streamsWrapper.getStreamsList().get(i);
+            if (stream instanceof VideoStream) {
+                final boolean videoOnly = ((VideoStream) stream).isVideoOnly();
+                if (videoOnly && !hasSecondaryStream(i)) {
+                    return true;
+                }
+            }
+        }
+
+        return false;
+    }
+
     /**
      * A wrapper class that includes a way of storing the stream sizes.
      *