ListView 中優化的 VideoView
這是你需要在包裝中使用的自定義 VideoView。
自定義 VideoView 佈局：
<your.packagename.VideoView
android:id="@+id/video_view"
android:layout_width="300dp"
android:layout_height="300dp" />
自定義優化 VideoView 程式碼：
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);
}
}
來自此 gitub 儲存庫的幫助。雖然它有一些問題，因為它是 3 年前寫的，我設法自己修復它們，如上所述。