我正在关注此ExampleMediaController tutorial。
这是VideoControlView.java，
package com.otwar.deepak.video_styling;
import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.ImageButton;
import android.widget.ProgressBar;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
import java.lang.ref.WeakReference;
import java.util.Formatter;
import java.util.Locale;
public class VideoControllerView extends FrameLayout {
private static final String TAG = "VideoControllerView";
private MediaPlayerControl mPlayer;
private Context mContext;
private ViewGroup mAnchor;
private View mRoot;
private ProgressBar mProgress;
private TextView mEndTime, mCurrentTime;
private boolean mShowing;
private boolean mDragging;
private static final int sDefaultTimeout = 3000;
private static final int FADE_OUT = 1;
private static final int SHOW_PROGRESS = 2;
private boolean mUseFastForward;
private boolean mFromXml;
private boolean mListenersSet;
private OnClickListener mNextListener, mPrevListener;
StringBuilder mFormatBuilder;
Formatter mFormatter;
private ImageButton mPauseButton;
private ImageButton mFfwdButton;
private ImageButton mRewButton;
private ImageButton mNextButton;
private ImageButton mPrevButton;
private ImageButton mFullscreenButton;
private Handler mHandler = new MessageHandler(this);
public VideoControllerView(Context context, AttributeSet attrs) {
super(context, attrs);
mRoot = null;
mContext = context;
mUseFastForward = true;
mFromXml = true;
Log.i(TAG, TAG);
}
public VideoControllerView(Context context, boolean useFastForward) {
super(context);
mContext = context;
mUseFastForward = useFastForward;
Log.i(TAG, TAG);
}
public VideoControllerView(Context context) {
this(context, true);
Log.i(TAG, TAG);
}
@Override
public void onFinishInflate() {
if (mRoot != null)
initControllerView(mRoot);
}
public void setMediaPlayer(MediaPlayerControl player) {
mPlayer = player;
updatePausePlay();
updateFullScreen();
}
/**
* Set the view that acts as the anchor for the control view.
* This can for example be a VideoView, or your Activity's main view.
* @param view The view to which to anchor the controller when it is visible.
*/
public void setAnchorView(ViewGroup view) {
mAnchor = view;
LayoutParams frameParams = new LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT
);
removeAllViews();
View v = makeControllerView();
addView(v, frameParams);
}
/**
* Create the view that holds the widgets that control playback.
* Derived classes can override this to create their own.
* @return The controller view.
* @hide This doesn't work as advertised
*/
protected View makeControllerView() {
LayoutInflater inflate = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mRoot = inflate.inflate(R.layout.media_controller, null);
initControllerView(mRoot);
return mRoot;
}
private void initControllerView(View v) {
mPauseButton = (ImageButton) v.findViewById(R.id.pause);
if (mPauseButton != null) {
mPauseButton.requestFocus();
mPauseButton.setOnClickListener(mPauseListener);
}
mFullscreenButton = (ImageButton) v.findViewById(R.id.fullscreen);
if (mFullscreenButton != null) {
mFullscreenButton.requestFocus();
mFullscreenButton.setOnClickListener(mFullscreenListener);
}
mFfwdButton = (ImageButton) v.findViewById(R.id.ffwd);
if (mFfwdButton != null) {
mFfwdButton.setOnClickListener(mFfwdListener);
if (!mFromXml) {
mFfwdButton.setVisibility(mUseFastForward ? View.VISIBLE : View.GONE);
}
}
mRewButton = (ImageButton) v.findViewById(R.id.rew);
if (mRewButton != null) {
mRewButton.setOnClickListener(mRewListener);
if (!mFromXml) {
mRewButton.setVisibility(mUseFastForward ? View.VISIBLE : View.GONE);
}
}
// By default these are hidden. They will be enabled when setPrevNextListeners() is called
mNextButton = (ImageButton) v.findViewById(R.id.next);
if (mNextButton != null && !mFromXml && !mListenersSet) {
mNextButton.setVisibility(View.GONE);
}
mPrevButton = (ImageButton) v.findViewById(R.id.prev);
if (mPrevButton != null && !mFromXml && !mListenersSet) {
mPrevButton.setVisibility(View.GONE);
}
mProgress = (ProgressBar) v.findViewById(R.id.mediacontroller_progress);
if (mProgress != null) {
if (mProgress instanceof SeekBar) {
SeekBar seeker = (SeekBar) mProgress;
seeker.setOnSeekBarChangeListener(mSeekListener);
}
mProgress.setMax(1000);
}
mEndTime = (TextView) v.findViewById(R.id.time);
mCurrentTime = (TextView) v.findViewById(R.id.time_current);
mFormatBuilder = new StringBuilder();
mFormatter = new Formatter(mFormatBuilder, Locale.getDefault());
installPrevNextListeners();
}
/**
* Show the controller on screen. It will go away
* automatically after 3 seconds of inactivity.
*/
public void show() {
show(sDefaultTimeout);
}
/**
* Disable pause or seek buttons if the stream cannot be paused or seeked.
* This requires the control interface to be a MediaPlayerControlExt
*/
private void disableUnsupportedButtons() {
if (mPlayer == null) {
return;
}
try {
if (mPauseButton != null && !mPlayer.canPause()) {
mPauseButton.setEnabled(false);
}
if (mRewButton != null && !mPlayer.canSeekBackward()) {
mRewButton.setEnabled(false);
}
if (mFfwdButton != null && !mPlayer.canSeekForward()) {
mFfwdButton.setEnabled(false);
}
} catch (IncompatibleClassChangeError ex) {
// We were given an old version of the interface, that doesn't have
// the canPause/canSeekXYZ methods. This is OK, it just means we
// assume the media can be paused and seeked, and so we don't disable
// the buttons.
}
}
/**
* Show the controller on screen. It will go away
* automatically after 'timeout' milliseconds of inactivity.
* @param timeout The timeout in milliseconds. Use 0 to show
* the controller until hide() is called.
*/
public void show(int timeout) {
if (!mShowing && mAnchor != null) {
setProgress();
if (mPauseButton != null) {
mPauseButton.requestFocus();
}
disableUnsupportedButtons();
LayoutParams tlp = new LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT,
Gravity.BOTTOM
);
mAnchor.addView(this, tlp);
mShowing = true;
}
updatePausePlay();
updateFullScreen();
// cause the progress bar to be updated even if mShowing
// was already true. This happens, for example, if we're
// paused with the progress bar showing the user hits play.
mHandler.sendEmptyMessage(SHOW_PROGRESS);
Message msg = mHandler.obtainMessage(FADE_OUT);
if (timeout != 0) {
mHandler.removeMessages(FADE_OUT);
mHandler.sendMessageDelayed(msg, timeout);
}
}
public boolean isShowing() {
return mShowing;
}
/**
* Remove the controller from the screen.
*/
public void hide() {
if (mAnchor == null) {
return;
}
try {
mAnchor.removeView(this);
mHandler.removeMessages(SHOW_PROGRESS);
} catch (IllegalArgumentException ex) {
Log.w("MediaController", "already removed");
}
mShowing = false;
}
private String stringForTime(int timeMs) {
int totalSeconds = timeMs / 1000;
int seconds = totalSeconds % 60;
int minutes = (totalSeconds / 60) % 60;
int hours = totalSeconds / 3600;
mFormatBuilder.setLength(0);
if (hours > 0) {
return mFormatter.format("%d:%02d:%02d", hours, minutes, seconds).toString();
} else {
return mFormatter.format("%02d:%02d", minutes, seconds).toString();
}
}
private int setProgress() {
if (mPlayer == null || mDragging) {
return 0;
}
int position = mPlayer.getCurrentPosition();
int duration = mPlayer.getDuration();
if (mProgress != null) {
if (duration > 0) {
// use long to avoid overflow
long pos = 1000L * position / duration;
mProgress.setProgress( (int) pos);
}
int percent = mPlayer.getBufferPercentage();
mProgress.setSecondaryProgress(percent * 10);
}
if (mEndTime != null)
mEndTime.setText(stringForTime(duration));
if (mCurrentTime != null)
mCurrentTime.setText(stringForTime(position));
return position;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
show(sDefaultTimeout);
return true;
}
@Override
public boolean onTrackballEvent(MotionEvent ev) {
show(sDefaultTimeout);
return false;
}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if (mPlayer == null) {
return true;
}
int keyCode = event.getKeyCode();
final boolean uniqueDown = event.getRepeatCount() == 0
&& event.getAction() == KeyEvent.ACTION_DOWN;
if (keyCode == KeyEvent.KEYCODE_HEADSETHOOK
|| keyCode == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE
|| keyCode == KeyEvent.KEYCODE_SPACE) {
if (uniqueDown) {
doPauseResume();
show(sDefaultTimeout);
if (mPauseButton != null) {
mPauseButton.requestFocus();
}
}
return true;
} else if (keyCode == KeyEvent.KEYCODE_MEDIA_PLAY) {
if (uniqueDown && !mPlayer.isPlaying()) {
mPlayer.start();
updatePausePlay();
show(sDefaultTimeout);
}
return true;
} else if (keyCode == KeyEvent.KEYCODE_MEDIA_STOP
|| keyCode == KeyEvent.KEYCODE_MEDIA_PAUSE) {
if (uniqueDown && mPlayer.isPlaying()) {
mPlayer.pause();
updatePausePlay();
show(sDefaultTimeout);
}
return true;
} else if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN
|| keyCode == KeyEvent.KEYCODE_VOLUME_UP
|| keyCode == KeyEvent.KEYCODE_VOLUME_MUTE) {
// don't show the controls for volume adjustment
return super.dispatchKeyEvent(event);
} else if (keyCode == KeyEvent.KEYCODE_BACK || keyCode == KeyEvent.KEYCODE_MENU) {
if (uniqueDown) {
hide();
}
return true;
}
show(sDefaultTimeout);
return super.dispatchKeyEvent(event);
}
private OnClickListener mPauseListener = new OnClickListener() {
public void onClick(View v) {
doPauseResume();
show(sDefaultTimeout);
}
};
private OnClickListener mFullscreenListener = new OnClickListener() {
public void onClick(View v) {
doToggleFullscreen();
show(sDefaultTimeout);
}
};
public void updatePausePlay() {
if (mRoot == null || mPauseButton == null || mPlayer == null) {
return;
}
if (mPlayer.isPlaying()) {
mPauseButton.setImageResource(R.drawable.ic_media_pause);
} else {
mPauseButton.setImageResource(R.drawable.ic_media_play);
}
}
public void updateFullScreen() {
if (mRoot == null || mFullscreenButton == null || mPlayer == null) {
return;
}
if (mPlayer.isFullScreen()) {
mFullscreenButton.setImageResource(R.drawable.ic_media_fullscreen_shrink);
}
else {
mFullscreenButton.setImageResource(R.drawable.ic_media_fullscreen_stretch);
}
}
private void doPauseResume() {
if (mPlayer == null) {
return;
}
if (mPlayer.isPlaying()) {
mPlayer.pause();
} else {
mPlayer.start();
}
updatePausePlay();
}
private void doToggleFullscreen() {
if (mPlayer == null) {
return;
}
mPlayer.toggleFullScreen();
}
// There are two scenarios that can trigger the seekbar listener to trigger:
//
// The first is the user using the touchpad to adjust the posititon of the
// seekbar's thumb. In this case onStartTrackingTouch is called followed by
// a number of onProgressChanged notifications, concluded by onStopTrackingTouch.
// We're setting the field "mDragging" to true for the duration of the dragging
// session to avoid jumps in the position in case of ongoing playback.
//
// The second scenario involves the user operating the scroll ball, in this
// case there WON'T BE onStartTrackingTouch/onStopTrackingTouch notifications,
// we will simply apply the updated position without suspending regular updates.
private OnSeekBarChangeListener mSeekListener = new OnSeekBarChangeListener() {
public void onStartTrackingTouch(SeekBar bar) {
show(3600000);
mDragging = true;
// By removing these pending progress messages we make sure
// that a) we won't update the progress while the user adjusts
// the seekbar and b) once the user is done dragging the thumb
// we will post one of these messages to the queue again and
// this ensures that there will be exactly one message queued up.
mHandler.removeMessages(SHOW_PROGRESS);
}
public void onProgressChanged(SeekBar bar, int progress, boolean fromuser) {
if (mPlayer == null) {
return;
}
if (!fromuser) {
// We're not interested in programmatically generated changes to
// the progress bar's position.
return;
}
long duration = mPlayer.getDuration();
long newposition = (duration * progress) / 1000L;
mPlayer.seekTo( (int) newposition);
if (mCurrentTime != null)
mCurrentTime.setText(stringForTime( (int) newposition));
}
public void onStopTrackingTouch(SeekBar bar) {
mDragging = false;
setProgress();
updatePausePlay();
show(sDefaultTimeout);
// Ensure that progress is properly updated in the future,
// the call to show() does not guarantee this because it is a
// no-op if we are already showing.
mHandler.sendEmptyMessage(SHOW_PROGRESS);
}
};
@Override
public void setEnabled(boolean enabled) {
if (mPauseButton != null) {
mPauseButton.setEnabled(enabled);
}
if (mFfwdButton != null) {
mFfwdButton.setEnabled(enabled);
}
if (mRewButton != null) {
mRewButton.setEnabled(enabled);
}
if (mNextButton != null) {
mNextButton.setEnabled(enabled && mNextListener != null);
}
if (mPrevButton != null) {
mPrevButton.setEnabled(enabled && mPrevListener != null);
}
if (mProgress != null) {
mProgress.setEnabled(enabled);
}
disableUnsupportedButtons();
super.setEnabled(enabled);
}
private OnClickListener mRewListener = new OnClickListener() {
public void onClick(View v) {
if (mPlayer == null) {
return;
}
int pos = mPlayer.getCurrentPosition();
pos -= 5000; // milliseconds
mPlayer.seekTo(pos);
setProgress();
show(sDefaultTimeout);
}
};
private OnClickListener mFfwdListener = new OnClickListener() {
public void onClick(View v) {
if (mPlayer == null) {
return;
}
int pos = mPlayer.getCurrentPosition();
pos += 15000; // milliseconds
mPlayer.seekTo(pos);
setProgress();
show(sDefaultTimeout);
}
};
private void installPrevNextListeners() {
if (mNextButton != null) {
mNextButton.setOnClickListener(mNextListener);
mNextButton.setEnabled(mNextListener != null);
}
if (mPrevButton != null) {
mPrevButton.setOnClickListener(mPrevListener);
mPrevButton.setEnabled(mPrevListener != null);
}
}
public void setPrevNextListeners(OnClickListener next, OnClickListener prev) {
mNextListener = next;
mPrevListener = prev;
mListenersSet = true;
if (mRoot != null) {
installPrevNextListeners();
if (mNextButton != null && !mFromXml) {
mNextButton.setVisibility(View.VISIBLE);
}
if (mPrevButton != null && !mFromXml) {
mPrevButton.setVisibility(View.VISIBLE);
}
}
}
public interface MediaPlayerControl {
void start();
void pause();
int getDuration();
int getCurrentPosition();
void seekTo(int pos);
boolean isPlaying();
int getBufferPercentage();
boolean canPause();
boolean canSeekBackward();
boolean canSeekForward();
boolean isFullScreen();
void toggleFullScreen();
}
private static class MessageHandler extends Handler {
private final WeakReference<VideoControllerView> mView;
MessageHandler(VideoControllerView view) {
mView = new WeakReference<VideoControllerView>(view);
}
@Override
public void handleMessage(Message msg) {
VideoControllerView view = mView.get();
if (view == null || view.mPlayer == null) {
return;
}
int pos;
switch (msg.what) {
case FADE_OUT:
view.hide();
break;
case SHOW_PROGRESS:
pos = view.setProgress();
if (!view.mDragging && view.mShowing && view.mPlayer.isPlaying()) {
msg = obtainMessage(SHOW_PROGRESS);
sendMessageDelayed(msg, 1000 - (pos % 1000));
}
break;
}
}
}
}
我的videoPlayerActivity.java
package com.otwar.deepak.video_styling;
import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.FrameLayout;
import java.io.IOException;
public class VideoPlayerActivity extends Activity implements SurfaceHolder.Callback, MediaPlayer.OnPreparedListener, VideoControllerView.MediaPlayerControl {
SurfaceView videoSurface;
MediaPlayer player;
VideoControllerView controller;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_video_player);
videoSurface = (SurfaceView) findViewById(R.id.videoSurface);
SurfaceHolder videoHolder = videoSurface.getHolder();
videoHolder.addCallback(this);
player = new MediaPlayer();
controller = new VideoControllerView(this);
try {
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
player.setDataSource(this, Uri.parse("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"));
player.setOnPreparedListener(this);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
controller.show();
return false;
}
// Implement SurfaceHolder.Callback
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
player.setDisplay(holder);
player.prepareAsync();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
// End SurfaceHolder.Callback
// Implement MediaPlayer.OnPreparedListener
@Override
public void onPrepared(MediaPlayer mp) {
controller.setMediaPlayer(this);
controller.setAnchorView((FrameLayout) findViewById(R.id.videoSurfaceContainer));
player.start();
}
// End MediaPlayer.OnPreparedListener
// Implement VideoMediaController.MediaPlayerControl
@Override
public boolean canPause() {
return true;
}
@Override
public boolean canSeekBackward() {
return true;
}
@Override
public boolean canSeekForward() {
return true;
}
@Override
public int getBufferPercentage() {
return 0;
}
@Override
public int getCurrentPosition() {
return player.getCurrentPosition();
}
@Override
public int getDuration() {
return player.getDuration();
}
@Override
public boolean isPlaying() {
return player.isPlaying();
}
@Override
public void pause() {
player.pause();
}
@Override
public void seekTo(int i) {
player.seekTo(i);
}
@Override
public void start() {
player.start();
}
@Override
public boolean isFullScreen() {
return false;
}
@Override
public void toggleFullScreen() {
}
// End VideoMediaController.MediaPlayerControl
}