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Android 下播放器实例 供学习和研究使用package com.zh_weir.videoplayer;
/*
* Copyright (C) 2006 The Android Open source Project
*
* 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.
*/
import android.R.integer;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.res.Resources;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionlistener;
import android.media.MediaPlayer.OnErrorListener;
import android.net.Uri;
import android.os.Powermanager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Viewgroup.LayoutParams;
import android.widget.MediaController;
import android.widget.MediaController.MediaPlayerControl;
import Java.io.IOException;
/**
* Displays a video file. The VideoView class
* can load images from various sources (such as resources or content
* providers), takes care of computing its measurement from the video so that
* it can be used in any layout manager, and provides various display options
* such as scaling and tinting.
*/
public class VideoView extends SurfaceView implements MediaPlayerControl {
private String tag = "VideoView";
private Context mContext;
// settable by the client
private Uri mUri;
private int mDuration;
// All the stuff we need for playing and showing a video
private SurfaceHolder mSurfaceHolder = null;
private MediaPlayer mMediaPlayer = null;
private boolean mIsPrepared;
private int mVideoWidth;
private int mVideoHeight;
private int mSurfaceWidth;
private int mSurfaceHeight;
private MediaController mMediaController;
private OnCompletionListener mOnCompletionListener;
private MediaPlayer.OnPreparedListener mOnPreparedListener;
private int mCurrentbufferPercentage;
private OnErrorListener mOnErrorListener;
private boolean mStartWhenPrepared;
private int mSeekWhenPrepared;
private MySizeChangeLinstener mMyChangeLinstener;
public int getVideoWidth(){
return mVideoWidth;
}
public int getVideoHeight(){
return mVideoHeight;
}
public void setVideoScale(int width , int height){
LayoutParams lp = getLayoutParams();
lp.height = height;
lp.width = width;
setLayoutParams(lp);
}
public interface MySizeChangeLinstener{
public void doMyThings();
}
public void setMySizeChangeLinstener(MySizeChangeLinstener l){
mMyChangeLinstener = l;
}
public VideoView(Context context) {
super(context);
mContext = context;
initVideoView();
}
public VideoView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
mContext = context;
initVideoView();
}
public VideoView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mContext = context;
initVideoView();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightmeasureSpec) {
//Log.i("@@@@", "onMeasure");
int width = getDEFAULTSize(mVideoWidth, widthMeasureSpec);
int height = getDefaultSize(mVideoHeight, heightMeasureSpec);
/*if (mVideoWidth > 0 && mVideoHeight > 0) {
if ( mVideoWidth * height > width * mVideoHeight ) {
//Log.i("@@@", "image too tall, correcting");
height = width * mVideoHeight / mVideoWidth;
} else if ( mVideoWidth * height < width * mVideoHeight ) {
//Log.i("@@@", "image too wide, correcting");
width = height * mVideoWidth / mVideoHeight;
} else {
//Log.i("@@@", "aspect ratio is correct: "
//width "/" height "="
//mVideoWidth "/" mVideoHeight);
}
}*/
//Log.i("@@@@@@@@@@", "setting size: " width 'x' height);
setMeasuredDimension(width,height);
}
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;
}
private void initVideoView() {
mVideoWidth = 0;
mVideoHeight = 0;
getHolder().addCallback(mSHCallback);
getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
setFocusable(true);
setFocusableInTouchMode(true);
requestFocus();
}
public void setVideoPath(String path) {
setVideoURI(Uri.parse(path));
}
public void setVideoURI(Uri uri) {
mUri = uri;
mStartWhenPrepared = false;
mSeekWhenPrepared = 0;
openVideo();
requestLayout();
invalidate();
}
public void stopPlayback() {
if (mMediaPlayer != null) {
mMediaPlayer.stop();
mMediaPlayer.release();
mMediaPlayer = null;
}
}
private void openVideo() {
if (mUri == null || mSurfaceHolder == null) {
// not ready for playback just yet, will try again later
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);
if (mMediaPlayer != null) {
mMediaPlayer.reset();
mMediaPlayer.release();
mMediaPlayer = null;
}
try {
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setOnPreparedListener(mPreparedListener);
mMediaPlayer.setOnVideoSizeChangedListener(mSizeChangedListener);
mIsPrepared = false;
Log.v(TAG, "reset duration to -1 in openVideo");
mDuration = -1;
mMediaPlayer.setOnCompletionListener(mCompletionListener);
mMediaPlayer.setOnErrorListener(mErrorListener);
mMediaPlayer.setOnBufferingupdateListener(mBufferingUpdateListener);
mCurrentBufferPercentage = 0;
mMediaPlayer.setDataSource(mContext, mUri);
mMediaPlayer.setDisplay(mSurfaceHolder);
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mMediaPlayer.setScreenOnWhilePlaying(true);
mMediaPlayer.prepareAsync();
attachMediaController();
} catch (IOException ex) {
Log.w(TAG, "Unable to open content: " mUri, ex);
return;
} catch (IllegalArgumentException ex) {
Log.w(TAG, "Unable to open content: " mUri, ex);
return;
}
}
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(mIsPrepared);
}
}
MediaPlayer.OnVideoSizeChangedListener mSizeChangedListener =
new MediaPlayer.OnVideoSizeChangedListener() {
public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
mVideoWidth = mp.getVideoWidth();
mVideoHeight = mp.getVideoHeight();
if(mMyChangeLinstener!=null){
mMyChangeLinstener.doMyThings();
}
if (mVideoWidth != 0 && mVideoHeight != 0) {
getHolder().setFixedSize(mVideoWidth, mVideoHeight);
}
}
};
MediaPlayer.OnPreparedListener mPreparedListener = new MediaPlayer.OnPreparedListener() {
public void onPrepared(MediaPlayer mp) {
// briefly show the mediacontroller
mIsPrepared = true;
if (mOnPreparedListener != null) {
mOnPreparedListener.onPrepared(mMediaPlayer);
}
if (mMediaController != null) {
mMediaController.setEnabled(true);
}
mVideoWidth = mp.getVideoWidth();
mVideoHeight = mp.getVideoHeight();
if (mVideoWidth != 0 && mVideoHeight != 0) {
//Log.i("@@@@", "video size: " mVideoWidth "/" mVideoHeight);
getHolder().setFixedSize(mVideoWidth, mVideoHeight);
if (mSurfaceWidth == mVideoWidth && mSurfaceHeight == mVideoHeight) {
// We didn't actually change the size (it was already at the size
// we need), so we won't get a "surface changed" callback, so
// start the video here instead of in the callback.
if (mSeekWhenPrepared != 0) {
mMediaPlayer.seekTo(mSeekWhenPrepared);
mSeekWhenPrepared = 0;
}
if (mStartWhenPrepared) {
mMediaPlayer.start();
mStartWhenPrepared = false;
if (mMediaController != null) {
mMediaController.show();
}
} else if (!isPlaying() &&
(mSeekWhenPrepared != 0 || getCurrentPosition() > 0)) {
if (mMediaController != null) {
// Show the media controls when we're paused into a video and make 'em stick.
mMediaController.show(0);
}
}
}
} else {
// We don't know the video size yet, but should start anyway.
// The video size might be reported to us later.
if (mSeekWhenPrepared != 0) {
mMediaPlayer.seekTo(mSeekWhenPrepared);
mSeekWhenPrepared = 0;
}
if (mStartWhenPrepared) {
mMediaPlayer.start();
mStartWhenPrepared = false;
}
}
}
};
private MediaPlayer.OnCompletionListener mCompletionListener =
new MediaPlayer.OnCompletionListener() {
public void onCompletion(MediaPlayer mp) {
if (mMediaController != null) {
mMediaController.hide();
}
if (mOnCompletionListener != null) {
mOnCompletionListener.onCompletion(mMediaPlayer);
}
}
};
private MediaPlayer.OnErrorListener mErrorListener =
new MediaPlayer.OnErrorListener() {
public boolean onError(MediaPlayer mp, int framework_err, int impl_err) {
Log.d(TAG, "Error: " framework_err "," impl_err);
if (mMediaController != null) {
mMediaController.hide();
}
/* If an error handler has been supplied, use it and finish. */
if (mOnErrorListener != null) {
if (mOnErrorListener.onError(mMediaPlayer, framework_err, impl_err)) {
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) {
Resources r = mContext.getResources();
int messageId;
/* if (framework_err == MediaPlayer.MEDIA_ERROR_NOT_VALID_FOR_PROGRESSIVE_PLAYBACK) {
messageId = com.android.internal.R.string.VideoView_error_text_invalid_progressive_playback;
} else {
messageId = com.android.internal.R.string.VideoView_error_text_unknown;
}
new AlertDialog.Builder(mContext)
.setTitle(com.android.internal.R.string.VideoView_error_title)
.setMessage(messageId)
.setPositivebutton(com.android.internal.R.string.VideoView_error_button,
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;
}
};
private MediaPlayer.OnBufferingUpdateListener mBufferingUpdateListener =
new MediaPlayer.OnBufferingUpdateListener() {
public void onBufferingUpdate(MediaPlayer mp, int percent) {
mCurrentBufferPercentage = percent;
}
};
/**
* 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;
}
SurfaceHolder.Callback mSHCallback = new SurfaceHolder.Callback()
{
public void surfaceChanged(SurfaceHolder holder, int format,
int w, int h)
{
mSurfaceWidth = w;
mSurfaceHeight = h;
if (mMediaPlayer != null && mIsPrepared && mVideoWidth == w && mVideoHeight == h) {
if (mSeekWhenPrepared != 0) {
mMediaPlayer.seekTo(mSeekWhenPrepared);
mSeekWhenPrepared = 0;
}
mMediaPlayer.start();
if (mMediaController != null) {
mMediaController.show();
}
}
}
public void surfaceCreated(SurfaceHolder holder)
{
mSurfaceHolder = holder;
openVideo();
}
public void surfaceDestroyed(SurfaceHolder holder)
{
// after we return from this we can't use the surface any more
mSurfaceHolder = null;
if (mMediaController != null) mMediaController.hide();
if (mMediaPlayer != null) {
mMediaPlayer.reset();
mMediaPlayer.release();
mMediaPlayer = null;
}
}
};
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mIsPrepared && mMediaPlayer != null && mMediaController != null) {
toggleMediaControlsVisiblity();
}
return false;
}
@Override
public boolean onTrackballEvent(MotionEvent ev) {
if (mIsPrepared && mMediaPlayer != null && mMediaController != null) {
toggleMediaControlsVisiblity();
}
return false;
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if (mIsPrepared &&
keyCode != KeyEvent.KEYCODE_BACK &&
keyCode != KeyEvent.KEYCODE_VOLUME_UP &&
keyCode != KeyEvent.KEYCODE_VOLUME_DOWN &&
keyCode != KeyEvent.KEYCODE_MENU &&
keyCode != KeyEvent.KEYCODE_CALL &&
keyCode != KeyEvent.KEYCODE_ENDCALL &&
mMediaPlayer != null &&
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_STOP
&& mMediaPlayer.isPlaying()) {
pause();
mMediaController.show();
} else {
toggleMediaControlsVisiblity();
}
}
return super.onKeyDown(keyCode, event);
}
private void toggleMediaControlsVisiblity() {
if (mMediaController.isShowing()) {
mMediaController.hide();
} else {
mMediaController.show();
}
}
public void start() {
if (mMediaPlayer != null && mIsPrepared) {
mMediaPlayer.start();
mStartWhenPrepared = false;
} else {
mStartWhenPrepared = true;
}
}
public void pause() {
if (mMediaPlayer != null && mIsPrepared) {
if (mMediaPlayer.isPlaying()) {
mMediaPlayer.pause();
}
}
mStartWhenPrepared = false;
}
public int getDuration() {
if (mMediaPlayer != null && mIsPrepared) {
if (mDuration > 0) {
return mDuration;
}
mDuration = mMediaPlayer.getDuration();
return mDuration;
}
mDuration = -1;
return mDuration;
}
public int getCurrentPosition() {
if (mMediaPlayer != null && mIsPrepared) {
return mMediaPlayer.getCurrentPosition();
}
return 0;
}
public void seekTo(int msec) {
if (mMediaPlayer != null && mIsPrepared) {
mMediaPlayer.seekTo(msec);
} else {
mSeekWhenPrepared = msec;
}
}
public boolean isPlaying() {
if (mMediaPlayer != null && mIsPrepared) {
return mMediaPlayer.isPlaying();
}
return false;
}
public int getBufferPercentage() {
if (mMediaPlayer != null) {
return mCurrentBufferPercentage;
}
return 0;
}
@Override
public boolean canPause() {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean canSeekBackward() {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean canSeekForward() {
// TODO Auto-generated method stub
return false;
}
}
简介：android 下播放器实例 供学习和研究使用package com.z
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