A SeekBar suited for showing a preview of something. As seen in Google Play Movies.
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README.md

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 {
    // Base implementation with a standard SeekBar
    implementation 'com.github.rubensousa:previewseekbar:2.0.0'

    // ExoPlayer extension that contains a TimeBar.
    implementation 'com.github.rubensousa:previewseekbar-exoplayer:2.8.1.0'
}

If you're going to use this with ExoPlayer, you need both dependencies.

How to use

Add the following XML:

<FrameLayout
  android:id="@+id/previewFrameLayout"
  android:layout_width="@dimen/video_preview_width"
  android:layout_height="@dimen/video_preview_height">

  <ImageView
      android:id="@+id/imageView"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      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_marginTop="25dp"
  android:max="800" />

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:

<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">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</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"
    app:previewFrameLayout="@id/previewFrameLayout"/>

Create your own ExoPlayerLoader that seeks the video to the current position

In this sample, Glide is used with a custom transformation to crop the thumbnails from a thumbnail sprite.

GlideThumbnailTransformation

@Override
public void loadPreview(long currentPosition, long max) {
    player.setPlayWhenReady(false);
    GlideApp.with(imageView)
            .load(thumbnailsUrl)
            .override(GlideThumbnailTransformation.IMAGE_WIDTH,
                    GlideThumbnailTransformation.IMAGE_HEIGHT)
            .transform(new GlideThumbnailTransformation(currentPosition))
            .into(imageView);
}

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.