PreviewSeekBar
A SeekBar suited for showing a preview of something. As seen in Google Play Movies.
Google Play Movies
PreviewSeekBar's sample
Build
Add the following to your app's build.gradle:
dependencies {
compile 'com.github.rubensousa:previewseekbar:1.0'
// If you want to use this with ExoPlayer, use this one:
compile 'com.github.rubensousa:previewseekbar-exoplayer:2.5.1'
}
How to use
Add the following XML:
<com.github.rubensousa.previewseekbar.PreviewSeekBarLayout
android:id="@+id/previewSeekBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<FrameLayout
android:id="@+id/previewFrameLayout"
android:layout_width="@dimen/video_preview_width"
android:layout_height="@dimen/video_preview_height">
<View
android:id="@+id/videoView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="@color/colorPrimary" />
</FrameLayout>
<com.github.rubensousa.previewseekbar.PreviewSeekBar
android:id="@+id/previewSeekBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/previewFrameLayout"
android:layout_marginTop="25dp"
android:max="800" />
</com.github.rubensousa.previewseekbar.PreviewSeekBarLayout>You need to add at least one PreviewSeekBar and a FrameLayout inside PreviewSeekBarLayout, else an exception will be thrown.
PreviewSeekBarLayout extends from RelativeLayout so you can add other views or layouts there.
Create a PreviewLoader and pass it to PreviewSeekBarLayout:
// Create a class that implements this interface and implement your own preview logic there public interface PreviewLoader {
void loadPreview(long currentPosition, long max);
}
PreviewLoader loader = new ExoPlayerLoader();
previewSeekBarLayout.setup(loader);
How to use with ExoPlayer
Add a custom controller to your SimpleExoPlayerView
<com.google.android.exoplayer2.ui.SimpleExoPlayerView
android:id="@+id/player_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:controller_layout_id="@layout/exoplayer_controls"/>Here's the sample's exoplayer_controls: https://github.com/rubensousa/PreviewSeekBar/blob/master/sample/src/main/res/layout/exoplayer_controls.xml
The PreviewSeekBarLayout inside exoplayer_controls should be similar to this:
<com.github.rubensousa.previewseekbar.exoplayer.PreviewTimeBarLayout
android:id="@+id/previewTimeBarLayout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1">
<FrameLayout
android:id="@+id/previewFrameLayout"
android:layout_width="@dimen/video_preview_width"
android:layout_height="@dimen/video_preview_height"
android:background="@drawable/video_frame"
android:padding="@dimen/video_frame_width">
<com.google.android.exoplayer2.ui.SimpleExoPlayerView
android:id="@+id/previewPlayerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:controller_layout_id="@layout/exo_simple_player_view"
app:surface_type="texture_view"
app:use_artwork="false"
app:use_controller="false" />
</FrameLayout>
<com.github.rubensousa.previewseekbar.exoplayer.PreviewTimeBar
android:id="@+id/exo_progress"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/previewFrameLayout"
android:layout_marginTop="10dp"
android:max="800" /> </com.github.rubensousa.previewseekbar.PreviewSeekBarLayout>Use the following SimpleExoPlayerView for the preview:
<com.google.android.exoplayer2.ui.SimpleExoPlayerView
android:id="@+id/previewPlayerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:controller_layout_id="@layout/exo_simple_player_view"
app:surface_type="texture_view"
app:use_artwork="false"
app:use_controller="false" />We specify another controller layout because the default one includes a SeekBar with the same id as ours.
Create a player with a custom TrackSelection and LoadControl
private SimpleExoPlayer createPreviewPlayer() {
TrackSelection.Factory videoTrackSelectionFactory = new WorstVideoTrackSelection.Factory();
TrackSelector trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);
LoadControl loadControl = new PreviewLoadControl();
SimpleExoPlayer player = ExoPlayerFactory.newSimpleInstance(
new DefaultRenderersFactory(context), trackSelector, loadControl);
player.setPlayWhenReady(false);
player.setVolume(0f);
player.prepare(mediaSourceBuilder.getMediaSource(true));
return player;
}
PreviewLoadControl and WorstVideoTrackSelection are already included in previewseekbar-exoplayer. Check the next section for some improvements notes.
Create your own ExoPlayerLoader that seeks the video to the current position
@Override public void loadPreview(long currentPosition, long max) {
previewPlayer.seekTo(currentPosition);
previewPlayer.setPlayWhenReady(false);
}
Improvements
The sample uses some code adapted from the ExoPlayer official demo: https://github.com/google/ExoPlayer
A few improvements would be:
-
Adding a stream with lower bitrate to load and display the images faster.
-
Using some kind of special stream just for the thumbnails. Maybe this is how the Google Play team did it, I don't know. They load the thumbnails a lot faster than this sample.
-
Caching thumbnails in disk for offline use.
Any ideas for improving this would be welcomed!
License
Copyright 2017 The Android Open Source Project Copyright 2017 Rúben Sousa Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.