Optimized VideoView

<your.packagename.VideoView
    android:id="@+id/video_view"
    android:layout_width="300dp"
    android:layout_height="300dp" />

package your.package.com.whateveritis;

import android.content.Context;
import android.content.Intent;
import android.graphics.SurfaceTexture;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnErrorListener;
import android.media.MediaPlayer.OnInfoListener;
import android.net.Uri;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.Surface;
import android.view.TextureView;
import android.view.View;
import android.widget.MediaController;
import android.widget.MediaController.MediaPlayerControl;

import java.io.IOException;


/**
 * VideoView is used to play video, just like
 * {@link android.widget.VideoView VideoView}. We define a custom view, because
 * we could not use {@link android.widget.VideoView VideoView} in ListView. <br/>
 * VideoViews inside ScrollViews do not scroll properly. Even if you use the
 * workaround to set the background color, the MediaController does not scroll
 * along with the VideoView. Also, the scrolling video looks horrendous with the
 * workaround, lots of flickering.
 *
 * @author leo
 */
public class VideoView extends TextureView implements MediaPlayerControl {

    private static final String TAG = "tag";

    // all possible internal states
    private static final int STATE_ERROR = -1;
    private static final int STATE_IDLE = 0;
    private static final int STATE_PREPARING = 1;
    private static final int STATE_PREPARED = 2;
    private static final int STATE_PLAYING = 3;
    private static final int STATE_PAUSED = 4;
    private static final int STATE_PLAYBACK_COMPLETED = 5;

    // currentState is a VideoView object's current state.
    // targetState is the state that a method caller intends to reach.
    // For instance, regardless the VideoView object's current state,
    // calling pause() intends to bring the object to a target state
    // of STATE_PAUSED.
    private int mCurrentState = STATE_IDLE;
    private int mTargetState = STATE_IDLE;

    // Stuff we need for playing and showing a video
    private MediaPlayer mMediaPlayer;
    private int mVideoWidth;
    private int mVideoHeight;
    private int mSurfaceWidth;
    private int mSurfaceHeight;
    private SurfaceTexture mSurfaceTexture;
    private Surface mSurface;
    private MediaController mMediaController;
    private MediaPlayer.OnCompletionListener mOnCompletionListener;
    private MediaPlayer.OnPreparedListener mOnPreparedListener;

    private MediaPlayer.OnErrorListener mOnErrorListener;
    private MediaPlayer.OnInfoListener mOnInfoListener;

    private int mSeekWhenPrepared; // recording the seek position while
    // preparing
    private int mCurrentBufferPercentage;
    private int mAudioSession;
    private Uri mUri;

    private Context mContext;

    public VideoView(final Context context) {
        super(context);
        mContext = context;
        initVideoView();
    }

    public VideoView(final Context context, final AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        initVideoView();
    }

    public VideoView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mContext = context;
        initVideoView();
    }

    public void initVideoView() {
        mVideoHeight = 0;
        mVideoWidth = 0;
        setFocusable(false);
        setSurfaceTextureListener(mSurfaceTextureListener);
    }

    public int resolveAdjustedSize(int desiredSize, int measureSpec) {
        int result = desiredSize;
        int specMode = MeasureSpec.getMode(measureSpec);
        int specSize = MeasureSpec.getSize(measureSpec);

        switch (specMode) {
            case MeasureSpec.UNSPECIFIED:
            /*
             * Parent says we can be as big as we want. Just don't be larger
             * than max size imposed on ourselves.
             */
                result = desiredSize;
                break;

            case MeasureSpec.AT_MOST:
            /*
             * Parent says we can be as big as we want, up to specSize. Don't be
             * larger than specSize, and don't be larger than the max size
             * imposed on ourselves.
             */
                result = Math.min(desiredSize, specSize);
                break;

            case MeasureSpec.EXACTLY:
                // No choice. Do what we are told.
                result = specSize;
                break;
        }
        return result;
    }

    public void setVideoPath(String path) {
        Log.d(TAG, "Setting video path to: " + path);
        setVideoURI(Uri.parse(path));
    }

    public void setVideoURI(Uri _videoURI) {
        mUri = _videoURI;
        mSeekWhenPrepared = 0;
        requestLayout();
        invalidate();
        openVideo();
    }

    public Uri getUri() {
        return mUri;
    }

    public void setSurfaceTexture(SurfaceTexture _surfaceTexture) {
        mSurfaceTexture = _surfaceTexture;
    }

    public void openVideo() {
        if ((mUri == null) || (mSurfaceTexture == null)) {
            Log.d(TAG, "Cannot open video, uri or surface texture is null.");
            return;
        }
        // Tell the music playback service to pause
        // TODO: these constants need to be published somewhere in the
        // framework.
        Intent i = new Intent("com.android.music.musicservicecommand");
        i.putExtra("command", "pause");
        mContext.sendBroadcast(i);
        release(false);
        try {
            mSurface = new Surface(mSurfaceTexture);
            mMediaPlayer = new MediaPlayer();
            if (mAudioSession != 0) {
                mMediaPlayer.setAudioSessionId(mAudioSession);
            } else {
                mAudioSession = mMediaPlayer.getAudioSessionId();
            }

            mMediaPlayer.setOnBufferingUpdateListener(mBufferingUpdateListener);
            mMediaPlayer.setOnCompletionListener(mCompleteListener);
            mMediaPlayer.setOnPreparedListener(mPreparedListener);
            mMediaPlayer.setOnErrorListener(mErrorListener);
            mMediaPlayer.setOnInfoListener(mOnInfoListener);
            mMediaPlayer.setOnVideoSizeChangedListener(mVideoSizeChangedListener);

            mMediaPlayer.setSurface(mSurface);
            mCurrentBufferPercentage = 0;
            mMediaPlayer.setDataSource(mContext, mUri);

            mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mMediaPlayer.setScreenOnWhilePlaying(true);

            mMediaPlayer.prepareAsync();
            mCurrentState = STATE_PREPARING;
        } catch (IllegalStateException e) {
            mCurrentState = STATE_ERROR;
            mTargetState = STATE_ERROR;
            String msg = (e.getMessage()==null)?"":e.getMessage();
            Log.i("",msg);  // TODO auto-generated catch block
        } catch (IOException e) {
            mCurrentState = STATE_ERROR;
            mTargetState = STATE_ERROR;
            String msg = (e.getMessage()==null)?"":e.getMessage();
            Log.i("",msg);  // TODO auto-generated catch block
        }
    }

    public void stopPlayback() {
        if (mMediaPlayer != null) {
            mMediaPlayer.stop();
            mMediaPlayer.release();
            mMediaPlayer = null;
            if (null != mMediaControllListener) {
                mMediaControllListener.onStop();
            }
        }
    }

    public void setMediaController(MediaController controller) {
        if (mMediaController != null) {
            mMediaController.hide();
        }
        mMediaController = controller;
        attachMediaController();
    }

    private void attachMediaController() {
        if (mMediaPlayer != null && mMediaController != null) {
            mMediaController.setMediaPlayer(this);
            View anchorView = this.getParent() instanceof View ? (View) this.getParent() : this;
            mMediaController.setAnchorView(anchorView);
            mMediaController.setEnabled(isInPlaybackState());
        }
    }

    private void release(boolean cleartargetstate) {
        Log.d(TAG, "Releasing media player.");
        if (mMediaPlayer != null) {
            mMediaPlayer.reset();
            mMediaPlayer.release();
            mMediaPlayer = null;
            mCurrentState = STATE_IDLE;
            if (cleartargetstate) {
                mTargetState = STATE_IDLE;
            }
        } else {
            Log.d(TAG, "Media player was null, did not release.");
        }
    }

    @Override
    protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
        // Will resize the view if the video dimensions have been found.
        // video dimensions are found after onPrepared has been called by
        // MediaPlayer
        int width = getDefaultSize(mVideoWidth, widthMeasureSpec);
        int height = getDefaultSize(mVideoHeight, heightMeasureSpec);
        if ((mVideoWidth > 0) && (mVideoHeight > 0)) {
            if ((mVideoWidth * height) > (width * mVideoHeight)) {
                Log.d(TAG, "Video too tall, change size.");
                height = (width * mVideoHeight) / mVideoWidth;
            } else if ((mVideoWidth * height) < (width * mVideoHeight)) {
                Log.d(TAG, "Video too wide, change size.");
                width = (height * mVideoWidth) / mVideoHeight;
            } else {
                Log.d(TAG, "Aspect ratio is correct.");
            }
        }
        setMeasuredDimension(width, height);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        if (isInPlaybackState() && mMediaController != null) {
            toggleMediaControlsVisiblity();
        }
        return false;
    }

    @Override
    public boolean onTrackballEvent(MotionEvent ev) {
        if (isInPlaybackState() && mMediaController != null) {
            toggleMediaControlsVisiblity();
        }
        return false;
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        boolean isKeyCodeSupported = keyCode != KeyEvent.KEYCODE_BACK && keyCode != KeyEvent.KEYCODE_VOLUME_UP && keyCode != KeyEvent.KEYCODE_VOLUME_DOWN
                && keyCode != KeyEvent.KEYCODE_VOLUME_MUTE && keyCode != KeyEvent.KEYCODE_MENU && keyCode != KeyEvent.KEYCODE_CALL
                && keyCode != KeyEvent.KEYCODE_ENDCALL;
        if (isInPlaybackState() && isKeyCodeSupported && mMediaController != null) {
            if (keyCode == KeyEvent.KEYCODE_HEADSETHOOK || keyCode == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE) {
                if (mMediaPlayer.isPlaying()) {
                    pause();
                    mMediaController.show();
                } else {
                    start();
                    mMediaController.hide();
                }
                return true;
            } else if (keyCode == KeyEvent.KEYCODE_MEDIA_PLAY) {
                if (!mMediaPlayer.isPlaying()) {
                    start();
                    mMediaController.hide();
                }
                return true;
            } else if (keyCode == KeyEvent.KEYCODE_MEDIA_STOP || keyCode == KeyEvent.KEYCODE_MEDIA_PAUSE) {
                if (mMediaPlayer.isPlaying()) {
                    pause();
                    mMediaController.show();
                }
                return true;
            } else {
                toggleMediaControlsVisiblity();
            }
        }

        return super.onKeyDown(keyCode, event);
    }

    private void toggleMediaControlsVisiblity() {
        if (mMediaController.isShowing()) {
            mMediaController.hide();
        } else {
            mMediaController.show();
        }
    }

    public void start() {
        // This can potentially be called at several points, it will go through
        // when all conditions are ready
        // 1. When setting the video URI
        // 2. When the surface becomes available
        // 3. From the activity
        if (isInPlaybackState()) {
            mMediaPlayer.start();
            mCurrentState = STATE_PLAYING;
            if (null != mMediaControllListener) {
                mMediaControllListener.onStart();
            }
        } else {
            Log.d(TAG, "Could not start. Current state " + mCurrentState);
        }
        mTargetState = STATE_PLAYING;
    }

    public void pause() {
        if (isInPlaybackState()) {
            if (mMediaPlayer.isPlaying()) {
                mMediaPlayer.pause();
                mCurrentState = STATE_PAUSED;
                if (null != mMediaControllListener) {
                    mMediaControllListener.onPause();
                }
            }
        }
        mTargetState = STATE_PAUSED;
    }

    public void suspend() {
        release(false);
    }

    public void resume() {
        openVideo();
    }

    @Override
    public int getDuration() {
        if (isInPlaybackState()) {
            return mMediaPlayer.getDuration();
        }

        return -1;
    }

    @Override
    public int getCurrentPosition() {
        if (isInPlaybackState()) {
            return mMediaPlayer.getCurrentPosition();
        }
        return 0;
    }

    @Override
    public void seekTo(int msec) {
        if (isInPlaybackState()) {
            mMediaPlayer.seekTo(msec);
            mSeekWhenPrepared = 0;
        } else {
            mSeekWhenPrepared = msec;
        }
    }

    @Override
    public boolean isPlaying() {
        return isInPlaybackState() && mMediaPlayer.isPlaying();
    }

    @Override
    public int getBufferPercentage() {
        if (mMediaPlayer != null) {
            return mCurrentBufferPercentage;
        }
        return 0;
    }

    private boolean isInPlaybackState() {
        return ((mMediaPlayer != null) && (mCurrentState != STATE_ERROR) && (mCurrentState != STATE_IDLE) && (mCurrentState != STATE_PREPARING));
    }

    @Override
    public boolean canPause() {
        return false;
    }

    @Override
    public boolean canSeekBackward() {
        return false;
    }

    @Override
    public boolean canSeekForward() {
        return false;
    }

    @Override
    public int getAudioSessionId() {
        if (mAudioSession == 0) {
            MediaPlayer foo = new MediaPlayer();
            mAudioSession = foo.getAudioSessionId();
            foo.release();
        }
        return mAudioSession;
    }

    // Listeners
    private MediaPlayer.OnBufferingUpdateListener mBufferingUpdateListener = new MediaPlayer.OnBufferingUpdateListener() {
        @Override
        public void onBufferingUpdate(final MediaPlayer mp, final int percent) {
            mCurrentBufferPercentage = percent;
        }
    };

    private MediaPlayer.OnCompletionListener mCompleteListener = new MediaPlayer.OnCompletionListener() {
        @Override
        public void onCompletion(final MediaPlayer mp) {
            mCurrentState = STATE_PLAYBACK_COMPLETED;
            mTargetState = STATE_PLAYBACK_COMPLETED;
            mSurface.release();

            if (mMediaController != null) {
                mMediaController.hide();
            }

            if (mOnCompletionListener != null) {
                mOnCompletionListener.onCompletion(mp);
            }

            if (mMediaControllListener != null) {
                mMediaControllListener.onComplete();
            }
        }
    };

    private MediaPlayer.OnPreparedListener mPreparedListener = new MediaPlayer.OnPreparedListener() {
        @Override
        public void onPrepared(final MediaPlayer mp) {
            mCurrentState = STATE_PREPARED;

            mMediaController = new MediaController(getContext());

            if (mOnPreparedListener != null) {
                mOnPreparedListener.onPrepared(mMediaPlayer);
            }
            if (mMediaController != null) {
                mMediaController.setEnabled(true);
                //mMediaController.setAnchorView(getRootView());
            }

            mVideoWidth = mp.getVideoWidth();
            mVideoHeight = mp.getVideoHeight();

            int seekToPosition = mSeekWhenPrepared; // mSeekWhenPrepared may be
            // changed after seekTo()
            // call
            if (seekToPosition != 0) {
                seekTo(seekToPosition);
            }

            requestLayout();
            invalidate();
            if ((mVideoWidth != 0) && (mVideoHeight != 0)) {
                if (mTargetState == STATE_PLAYING) {
                    mMediaPlayer.start();
                    if (null != mMediaControllListener) {
                        mMediaControllListener.onStart();
                    }
                }
            } else {
                if (mTargetState == STATE_PLAYING) {
                    mMediaPlayer.start();
                    if (null != mMediaControllListener) {
                        mMediaControllListener.onStart();
                    }
                }
            }
        }
    };

    private MediaPlayer.OnVideoSizeChangedListener mVideoSizeChangedListener = new MediaPlayer.OnVideoSizeChangedListener() {
        @Override
        public void onVideoSizeChanged(final MediaPlayer mp, final int width, final int height) {
            mVideoWidth = mp.getVideoWidth();
            mVideoHeight = mp.getVideoHeight();
            if (mVideoWidth != 0 && mVideoHeight != 0) {
                requestLayout();
            }
        }
    };

    private MediaPlayer.OnErrorListener mErrorListener = new MediaPlayer.OnErrorListener() {
        @Override
        public boolean onError(final MediaPlayer mp, final int what, final int extra) {
            Log.d(TAG, "Error: " + what + "," + extra);
            mCurrentState = STATE_ERROR;
            mTargetState = STATE_ERROR;

            if (mMediaController != null) {
                mMediaController.hide();
            }

            /* If an error handler has been supplied, use it and finish. */
            if (mOnErrorListener != null) {
                if (mOnErrorListener.onError(mMediaPlayer, what, extra)) {
                    return true;
                }
            }

            /*
             * Otherwise, pop up an error dialog so the user knows that
             * something bad has happened. Only try and pop up the dialog if
             * we're attached to a window. When we're going away and no longer
             * have a window, don't bother showing the user an error.
             */
            if (getWindowToken() != null) {

//                new AlertDialog.Builder(mContext).setMessage("Error: " + what + "," + extra).setPositiveButton("OK", new DialogInterface.OnClickListener() {
//                    public void onClick(DialogInterface dialog, int whichButton) {
//                        /*
//                         * If we get here, there is no onError listener, so at
//                         * least inform them that the video is over.
//                         */
//                        if (mOnCompletionListener != null) {
//                            mOnCompletionListener.onCompletion(mMediaPlayer);
//                        }
//                    }
//                }).setCancelable(false).show();
            }
            return true;
        }
    };

    SurfaceTextureListener mSurfaceTextureListener = new SurfaceTextureListener() {
        @Override
        public void onSurfaceTextureAvailable(final SurfaceTexture surface, final int width, final int height) {
            Log.d(TAG, "onSurfaceTextureAvailable.");
            mSurfaceTexture = surface;
            openVideo();
        }

        @Override
        public void onSurfaceTextureSizeChanged(final SurfaceTexture surface, final int width, final int height) {
            Log.d(TAG, "onSurfaceTextureSizeChanged: " + width + '/' + height);
            mSurfaceWidth = width;
            mSurfaceHeight = height;
            boolean isValidState = (mTargetState == STATE_PLAYING);
            boolean hasValidSize = (mVideoWidth == width && mVideoHeight == height);
            if (mMediaPlayer != null && isValidState && hasValidSize) {
                if (mSeekWhenPrepared != 0) {
                    seekTo(mSeekWhenPrepared);
                }
                start();
            }
        }

        @Override
        public boolean onSurfaceTextureDestroyed(final SurfaceTexture surface) {

            mSurface = null;
            if (mMediaController != null)
                mMediaController.hide();
            release(true);
            return true;
        }

        @Override
        public void onSurfaceTextureUpdated(final SurfaceTexture surface) {

        }
    };

    /**
     * Register a callback to be invoked when the media file is loaded and ready
     * to go.
     *
     * @param l The callback that will be run
     */
    public void setOnPreparedListener(MediaPlayer.OnPreparedListener l) {
        mOnPreparedListener = l;
    }

    /**
     * Register a callback to be invoked when the end of a media file has been
     * reached during playback.
     *
     * @param l The callback that will be run
     */
    public void setOnCompletionListener(OnCompletionListener l) {
        mOnCompletionListener = l;
    }

    /**
     * Register a callback to be invoked when an error occurs during playback or
     * setup. If no listener is specified, or if the listener returned false,
     * VideoView will inform the user of any errors.
     *
     * @param l The callback that will be run
     */
    public void setOnErrorListener(OnErrorListener l) {
        mOnErrorListener = l;
    }

    /**
     * Register a callback to be invoked when an informational event occurs
     * during playback or setup.
     *
     * @param l The callback that will be run
     */
    public void setOnInfoListener(OnInfoListener l) {
        mOnInfoListener = l;
    }

    public static interface MediaControllListener {
        public void onStart();

        public void onPause();

        public void onStop();

        public void onComplete();
    }

    MediaControllListener mMediaControllListener;

    public void setMediaControllListener(MediaControllListener mediaControllListener) {
        mMediaControllListener = mediaControllListener;
    }


    @Override
    public void setVisibility(int visibility) {
        System.out.println("setVisibility: " + visibility);
        super.setVisibility(visibility);
    }
}